Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Borislav Petkov | 5ce78af | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2 | * IDE ATAPI streaming tape driver. |
| 3 | * |
Bartlomiej Zolnierkiewicz | 59bca8c | 2008-02-01 23:09:33 +0100 | [diff] [blame] | 4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
| 5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * This driver was constructed as a student project in the software laboratory |
| 8 | * of the faculty of electrical engineering in the Technion - Israel's |
| 9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. |
| 10 | * |
| 11 | * It is hereby placed under the terms of the GNU general public license. |
| 12 | * (See linux/COPYING). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Borislav Petkov | 5ce78af | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 14 | * For a historical changelog see |
| 15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
Borislav Petkov | dfe7993 | 2008-02-06 02:57:55 +0100 | [diff] [blame] | 18 | #define IDETAPE_VERSION "1.20" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/timer.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/interrupt.h> |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 28 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/errno.h> |
| 31 | #include <linux/genhd.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/pci.h> |
| 34 | #include <linux/ide.h> |
| 35 | #include <linux/smp_lock.h> |
| 36 | #include <linux/completion.h> |
| 37 | #include <linux/bitops.h> |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 38 | #include <linux/mutex.h> |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 39 | #include <scsi/scsi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #include <asm/byteorder.h> |
Borislav Petkov | c837cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 42 | #include <linux/irq.h> |
| 43 | #include <linux/uaccess.h> |
| 44 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/mtio.h> |
| 47 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 48 | enum { |
| 49 | /* output errors only */ |
| 50 | DBG_ERR = (1 << 0), |
| 51 | /* output all sense key/asc */ |
| 52 | DBG_SENSE = (1 << 1), |
| 53 | /* info regarding all chrdev-related procedures */ |
| 54 | DBG_CHRDEV = (1 << 2), |
| 55 | /* all remaining procedures */ |
| 56 | DBG_PROCS = (1 << 3), |
| 57 | /* buffer alloc info (pc_stack & rq_stack) */ |
| 58 | DBG_PCRQ_STACK = (1 << 4), |
| 59 | }; |
| 60 | |
| 61 | /* define to see debug info */ |
| 62 | #define IDETAPE_DEBUG_LOG 0 |
| 63 | |
| 64 | #if IDETAPE_DEBUG_LOG |
| 65 | #define debug_log(lvl, fmt, args...) \ |
| 66 | { \ |
| 67 | if (tape->debug_mask & lvl) \ |
| 68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ |
| 69 | } |
| 70 | #else |
| 71 | #define debug_log(lvl, fmt, args...) do {} while (0) |
| 72 | #endif |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | /**************************** Tunable parameters *****************************/ |
| 75 | |
| 76 | |
| 77 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 78 | * Pipelined mode parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 80 | * We try to use the minimum number of stages which is enough to keep the tape |
| 81 | * constantly streaming. To accomplish that, we implement a feedback loop around |
| 82 | * the maximum number of stages: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 84 | * We start from MIN maximum stages (we will not even use MIN stages if we don't |
| 85 | * need them), increment it by RATE*(MAX-MIN) whenever we sense that the |
| 86 | * pipeline is empty, until we reach the optimum value or until we reach MAX. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | */ |
| 88 | #define IDETAPE_MIN_PIPELINE_STAGES 1 |
| 89 | #define IDETAPE_MAX_PIPELINE_STAGES 400 |
| 90 | #define IDETAPE_INCREASE_STAGES_RATE 20 |
| 91 | |
| 92 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 93 | * After each failed packet command we issue a request sense command and retry |
| 94 | * the packet command IDETAPE_MAX_PC_RETRIES times. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 96 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | */ |
| 98 | #define IDETAPE_MAX_PC_RETRIES 3 |
| 99 | |
| 100 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 101 | * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE |
| 102 | * bytes. This is used for several packet commands (Not for READ/WRITE commands) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | */ |
| 104 | #define IDETAPE_PC_BUFFER_SIZE 256 |
| 105 | |
| 106 | /* |
| 107 | * In various places in the driver, we need to allocate storage |
| 108 | * for packet commands and requests, which will remain valid while |
| 109 | * we leave the driver to wait for an interrupt or a timeout event. |
| 110 | */ |
| 111 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) |
| 112 | |
| 113 | /* |
| 114 | * Some drives (for example, Seagate STT3401A Travan) require a very long |
| 115 | * timeout, because they don't return an interrupt or clear their busy bit |
| 116 | * until after the command completes (even retension commands). |
| 117 | */ |
| 118 | #define IDETAPE_WAIT_CMD (900*HZ) |
| 119 | |
| 120 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 121 | * The following parameter is used to select the point in the internal tape fifo |
| 122 | * in which we will start to refill the buffer. Decreasing the following |
| 123 | * parameter will improve the system's latency and interactive response, while |
| 124 | * using a high value might improve system throughput. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | */ |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 126 | #define IDETAPE_FIFO_THRESHOLD 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 129 | * DSC polling parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 131 | * Polling for DSC (a single bit in the status register) is a very important |
| 132 | * function in ide-tape. There are two cases in which we poll for DSC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 134 | * 1. Before a read/write packet command, to ensure that we can transfer data |
| 135 | * from/to the tape's data buffers, without causing an actual media access. |
| 136 | * In case the tape is not ready yet, we take out our request from the device |
| 137 | * request queue, so that ide.c could service requests from the other device |
| 138 | * on the same interface in the meantime. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 140 | * 2. After the successful initialization of a "media access packet command", |
| 141 | * which is a command that can take a long time to complete (the interval can |
| 142 | * range from several seconds to even an hour). Again, we postpone our request |
| 143 | * in the middle to free the bus for the other device. The polling frequency |
| 144 | * here should be lower than the read/write frequency since those media access |
| 145 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST |
| 146 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD |
| 147 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 149 | * We also set a timeout for the timer, in case something goes wrong. The |
| 150 | * timeout should be longer then the maximum execution time of a tape operation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | */ |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 152 | |
| 153 | /* DSC timings. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
| 155 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
| 156 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
| 157 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
| 158 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
| 159 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
| 160 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
| 161 | |
| 162 | /*************************** End of tunable parameters ***********************/ |
| 163 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 164 | /* Read/Write error simulation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | #define SIMULATE_ERRORS 0 |
| 166 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 167 | /* tape directions */ |
| 168 | enum { |
| 169 | IDETAPE_DIR_NONE = (1 << 0), |
| 170 | IDETAPE_DIR_READ = (1 << 1), |
| 171 | IDETAPE_DIR_WRITE = (1 << 2), |
| 172 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | struct idetape_bh { |
Stephen Rothwell | ab05796 | 2007-08-01 23:46:44 +0200 | [diff] [blame] | 175 | u32 b_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | atomic_t b_count; |
| 177 | struct idetape_bh *b_reqnext; |
| 178 | char *b_data; |
| 179 | }; |
| 180 | |
Borislav Petkov | 03056b9 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 181 | /* Tape door status */ |
| 182 | #define DOOR_UNLOCKED 0 |
| 183 | #define DOOR_LOCKED 1 |
| 184 | #define DOOR_EXPLICITLY_LOCKED 2 |
| 185 | |
| 186 | /* Some defines for the SPACE command */ |
| 187 | #define IDETAPE_SPACE_OVER_FILEMARK 1 |
| 188 | #define IDETAPE_SPACE_TO_EOD 3 |
| 189 | |
| 190 | /* Some defines for the LOAD UNLOAD command */ |
| 191 | #define IDETAPE_LU_LOAD_MASK 1 |
| 192 | #define IDETAPE_LU_RETENSION_MASK 2 |
| 193 | #define IDETAPE_LU_EOT_MASK 4 |
| 194 | |
| 195 | /* |
| 196 | * Special requests for our block device strategy routine. |
| 197 | * |
| 198 | * In order to service a character device command, we add special requests to |
| 199 | * the tail of our block device request queue and wait for their completion. |
| 200 | */ |
| 201 | |
| 202 | enum { |
| 203 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ |
| 204 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ |
| 205 | REQ_IDETAPE_READ = (1 << 2), |
| 206 | REQ_IDETAPE_WRITE = (1 << 3), |
| 207 | }; |
| 208 | |
| 209 | /* Error codes returned in rq->errors to the higher part of the driver. */ |
| 210 | #define IDETAPE_ERROR_GENERAL 101 |
| 211 | #define IDETAPE_ERROR_FILEMARK 102 |
| 212 | #define IDETAPE_ERROR_EOD 103 |
| 213 | |
| 214 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
| 215 | #define IDETAPE_BLOCK_DESCRIPTOR 0 |
| 216 | #define IDETAPE_CAPABILITIES_PAGE 0x2a |
| 217 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 218 | /* Tape flag bits values. */ |
| 219 | enum { |
| 220 | IDETAPE_FLAG_IGNORE_DSC = (1 << 0), |
| 221 | /* 0 When the tape position is unknown */ |
| 222 | IDETAPE_FLAG_ADDRESS_VALID = (1 << 1), |
| 223 | /* Device already opened */ |
| 224 | IDETAPE_FLAG_BUSY = (1 << 2), |
| 225 | /* Error detected in a pipeline stage */ |
| 226 | IDETAPE_FLAG_PIPELINE_ERR = (1 << 3), |
| 227 | /* Attempt to auto-detect the current user block size */ |
| 228 | IDETAPE_FLAG_DETECT_BS = (1 << 4), |
| 229 | /* Currently on a filemark */ |
| 230 | IDETAPE_FLAG_FILEMARK = (1 << 5), |
| 231 | /* DRQ interrupt device */ |
| 232 | IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 6), |
| 233 | /* pipeline active */ |
| 234 | IDETAPE_FLAG_PIPELINE_ACTIVE = (1 << 7), |
| 235 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
| 236 | IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 8), |
| 237 | }; |
| 238 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 239 | /* A pipeline stage. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | typedef struct idetape_stage_s { |
| 241 | struct request rq; /* The corresponding request */ |
| 242 | struct idetape_bh *bh; /* The data buffers */ |
| 243 | struct idetape_stage_s *next; /* Pointer to the next stage */ |
| 244 | } idetape_stage_t; |
| 245 | |
| 246 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 247 | * Most of our global data which we need to save even as we leave the driver due |
| 248 | * to an interrupt or a timer event is stored in the struct defined below. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | */ |
| 250 | typedef struct ide_tape_obj { |
| 251 | ide_drive_t *drive; |
| 252 | ide_driver_t *driver; |
| 253 | struct gendisk *disk; |
| 254 | struct kref kref; |
| 255 | |
| 256 | /* |
| 257 | * Since a typical character device operation requires more |
| 258 | * than one packet command, we provide here enough memory |
| 259 | * for the maximum of interconnected packet commands. |
| 260 | * The packet commands are stored in the circular array pc_stack. |
| 261 | * pc_stack_index points to the last used entry, and warps around |
| 262 | * to the start when we get to the last array entry. |
| 263 | * |
| 264 | * pc points to the current processed packet command. |
| 265 | * |
| 266 | * failed_pc points to the last failed packet command, or contains |
| 267 | * NULL if we do not need to retry any packet command. This is |
| 268 | * required since an additional packet command is needed before the |
| 269 | * retry, to get detailed information on what went wrong. |
| 270 | */ |
| 271 | /* Current packet command */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 272 | struct ide_atapi_pc *pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /* Last failed packet command */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 274 | struct ide_atapi_pc *failed_pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | /* Packet command stack */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 276 | struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | /* Next free packet command storage space */ |
| 278 | int pc_stack_index; |
| 279 | struct request rq_stack[IDETAPE_PC_STACK]; |
| 280 | /* We implement a circular array */ |
| 281 | int rq_stack_index; |
| 282 | |
| 283 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 284 | * DSC polling variables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 286 | * While polling for DSC we use postponed_rq to postpone the current |
| 287 | * request so that ide.c will be able to service pending requests on the |
| 288 | * other device. Note that at most we will have only one DSC (usually |
| 289 | * data transfer) request in the device request queue. Additional |
| 290 | * requests can be queued in our internal pipeline, but they will be |
| 291 | * visible to ide.c only one at a time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | */ |
| 293 | struct request *postponed_rq; |
| 294 | /* The time in which we started polling for DSC */ |
| 295 | unsigned long dsc_polling_start; |
| 296 | /* Timer used to poll for dsc */ |
| 297 | struct timer_list dsc_timer; |
| 298 | /* Read/Write dsc polling frequency */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 299 | unsigned long best_dsc_rw_freq; |
| 300 | unsigned long dsc_poll_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | unsigned long dsc_timeout; |
| 302 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 303 | /* Read position information */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | u8 partition; |
| 305 | /* Current block */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 306 | unsigned int first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 308 | /* Last error information */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | u8 sense_key, asc, ascq; |
| 310 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 311 | /* Character device operation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | unsigned int minor; |
| 313 | /* device name */ |
| 314 | char name[4]; |
| 315 | /* Current character device data transfer direction */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 316 | u8 chrdev_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 318 | /* tape block size, usually 512 or 1024 bytes */ |
| 319 | unsigned short blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | int user_bs_factor; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* Copy of the tape's Capabilities and Mechanical Page */ |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 323 | u8 caps[20]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 326 | * Active data transfer request parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 328 | * At most, there is only one ide-tape originated data transfer request |
| 329 | * in the device request queue. This allows ide.c to easily service |
| 330 | * requests from the other device when we postpone our active request. |
| 331 | * In the pipelined operation mode, we use our internal pipeline |
| 332 | * structure to hold more data requests. The data buffer size is chosen |
| 333 | * based on the tape's recommendation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | */ |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 335 | /* ptr to the request which is waiting in the device request queue */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 336 | struct request *active_data_rq; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 337 | /* Data buffer size chosen based on the tape's recommendation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | int stage_size; |
| 339 | idetape_stage_t *merge_stage; |
| 340 | int merge_stage_size; |
| 341 | struct idetape_bh *bh; |
| 342 | char *b_data; |
| 343 | int b_count; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 346 | * Pipeline parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 348 | * To accomplish non-pipelined mode, we simply set the following |
| 349 | * variables to zero (or NULL, where appropriate). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | */ |
| 351 | /* Number of currently used stages */ |
| 352 | int nr_stages; |
| 353 | /* Number of pending stages */ |
| 354 | int nr_pending_stages; |
| 355 | /* We will not allocate more than this number of stages */ |
| 356 | int max_stages, min_pipeline, max_pipeline; |
| 357 | /* The first stage which will be removed from the pipeline */ |
| 358 | idetape_stage_t *first_stage; |
| 359 | /* The currently active stage */ |
| 360 | idetape_stage_t *active_stage; |
| 361 | /* Will be serviced after the currently active request */ |
| 362 | idetape_stage_t *next_stage; |
| 363 | /* New requests will be added to the pipeline here */ |
| 364 | idetape_stage_t *last_stage; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | int pages_per_stage; |
| 366 | /* Wasted space in each stage */ |
| 367 | int excess_bh_size; |
| 368 | |
| 369 | /* Status/Action flags: long for set_bit */ |
| 370 | unsigned long flags; |
| 371 | /* protects the ide-tape queue */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 372 | spinlock_t lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 374 | /* Measures average tape speed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | unsigned long avg_time; |
| 376 | int avg_size; |
| 377 | int avg_speed; |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | /* the door is currently locked */ |
| 380 | int door_locked; |
| 381 | /* the tape hardware is write protected */ |
| 382 | char drv_write_prot; |
| 383 | /* the tape is write protected (hardware or opened as read-only) */ |
| 384 | char write_prot; |
| 385 | |
| 386 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 387 | * Limit the number of times a request can be postponed, to avoid an |
| 388 | * infinite postpone deadlock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | int postpone_cnt; |
| 391 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 392 | /* Speed control at the tape buffers input/output */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | unsigned long insert_time; |
| 394 | int insert_size; |
| 395 | int insert_speed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | int measure_insert_time; |
| 397 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 398 | u32 debug_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } idetape_tape_t; |
| 400 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 401 | static DEFINE_MUTEX(idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 403 | static struct class *idetape_sysfs_class; |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
| 406 | |
| 407 | #define ide_tape_g(disk) \ |
| 408 | container_of((disk)->private_data, struct ide_tape_obj, driver) |
| 409 | |
| 410 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
| 411 | { |
| 412 | struct ide_tape_obj *tape = NULL; |
| 413 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 414 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | tape = ide_tape_g(disk); |
| 416 | if (tape) |
| 417 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 418 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return tape; |
| 420 | } |
| 421 | |
| 422 | static void ide_tape_release(struct kref *); |
| 423 | |
| 424 | static void ide_tape_put(struct ide_tape_obj *tape) |
| 425 | { |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 426 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | kref_put(&tape->kref, ide_tape_release); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 428 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 432 | * The variables below are used for the character device interface. Additional |
| 433 | * state variables are defined in our ide_drive_t structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 435 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
| 437 | #define ide_tape_f(file) ((file)->private_data) |
| 438 | |
| 439 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
| 440 | { |
| 441 | struct ide_tape_obj *tape = NULL; |
| 442 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 443 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | tape = idetape_devs[i]; |
| 445 | if (tape) |
| 446 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 447 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | return tape; |
| 449 | } |
| 450 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 451 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 452 | unsigned int bcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | { |
| 454 | struct idetape_bh *bh = pc->bh; |
| 455 | int count; |
| 456 | |
| 457 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (bh == NULL) { |
| 459 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 460 | "idetape_input_buffers\n"); |
Bartlomiej Zolnierkiewicz | 7616c0a | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 461 | ide_atapi_discard_data(drive, bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | return; |
| 463 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 464 | count = min( |
| 465 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), |
| 466 | bcount); |
| 467 | HWIF(drive)->atapi_input_bytes(drive, bh->b_data + |
| 468 | atomic_read(&bh->b_count), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | bcount -= count; |
| 470 | atomic_add(count, &bh->b_count); |
| 471 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 472 | bh = bh->b_reqnext; |
| 473 | if (bh) |
| 474 | atomic_set(&bh->b_count, 0); |
| 475 | } |
| 476 | } |
| 477 | pc->bh = bh; |
| 478 | } |
| 479 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 480 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 481 | unsigned int bcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
| 483 | struct idetape_bh *bh = pc->bh; |
| 484 | int count; |
| 485 | |
| 486 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 488 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 489 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | return; |
| 491 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
| 493 | HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); |
| 494 | bcount -= count; |
| 495 | pc->b_data += count; |
| 496 | pc->b_count -= count; |
| 497 | if (!pc->b_count) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 498 | bh = bh->b_reqnext; |
| 499 | pc->bh = bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | if (bh) { |
| 501 | pc->b_data = bh->b_data; |
| 502 | pc->b_count = atomic_read(&bh->b_count); |
| 503 | } |
| 504 | } |
| 505 | } |
| 506 | } |
| 507 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 508 | static void idetape_update_buffers(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | { |
| 510 | struct idetape_bh *bh = pc->bh; |
| 511 | int count; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 512 | unsigned int bcount = pc->xferred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 514 | if (pc->flags & PC_FLAG_WRITING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return; |
| 516 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 518 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 519 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | return; |
| 521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
| 523 | atomic_set(&bh->b_count, count); |
| 524 | if (atomic_read(&bh->b_count) == bh->b_size) |
| 525 | bh = bh->b_reqnext; |
| 526 | bcount -= count; |
| 527 | } |
| 528 | pc->bh = bh; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * idetape_next_pc_storage returns a pointer to a place in which we can |
| 533 | * safely store a packet command, even though we intend to leave the |
| 534 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet |
| 535 | * commands is allocated at initialization time. |
| 536 | */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 537 | static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
| 539 | idetape_tape_t *tape = drive->driver_data; |
| 540 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 541 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 544 | tape->pc_stack_index = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | return (&tape->pc_stack[tape->pc_stack_index++]); |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. |
| 550 | * Since we queue packet commands in the request queue, we need to |
| 551 | * allocate a request, along with the allocation of a packet command. |
| 552 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | /************************************************************** |
| 555 | * * |
| 556 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * |
| 557 | * followed later on by kfree(). -ml * |
| 558 | * * |
| 559 | **************************************************************/ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 560 | |
| 561 | static struct request *idetape_next_rq_storage(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | { |
| 563 | idetape_tape_t *tape = drive->driver_data; |
| 564 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 565 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 568 | tape->rq_stack_index = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | return (&tape->rq_stack[tape->rq_stack_index++]); |
| 570 | } |
| 571 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 572 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | { |
| 574 | memset(pc->c, 0, 12); |
| 575 | pc->retries = 0; |
| 576 | pc->flags = 0; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 577 | pc->req_xfer = 0; |
| 578 | pc->buf = pc->pc_buf; |
| 579 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | pc->bh = NULL; |
| 581 | pc->b_data = NULL; |
| 582 | } |
| 583 | |
| 584 | /* |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 585 | * called on each failed packet command retry to analyze the request sense. We |
| 586 | * currently do not utilize this information. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | */ |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 588 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
| 590 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 591 | struct ide_atapi_pc *pc = tape->failed_pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 593 | tape->sense_key = sense[2] & 0xF; |
| 594 | tape->asc = sense[12]; |
| 595 | tape->ascq = sense[13]; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 596 | |
| 597 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", |
| 598 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 600 | /* Correct pc->xferred by asking the tape. */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 601 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 602 | pc->xferred = pc->req_xfer - |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 603 | tape->blk_size * |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 604 | be32_to_cpu(get_unaligned((u32 *)&sense[3])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | idetape_update_buffers(pc); |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * If error was the result of a zero-length read or write command, |
| 610 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
| 611 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
| 612 | */ |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 613 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 614 | /* length == 0 */ |
| 615 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
| 616 | if (tape->sense_key == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | /* don't report an error, everything's ok */ |
| 618 | pc->error = 0; |
| 619 | /* don't retry read/write */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 620 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } |
| 622 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 623 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | pc->error = IDETAPE_ERROR_FILEMARK; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 625 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 627 | if (pc->c[0] == WRITE_6) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 628 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
| 629 | && tape->asc == 0x0 && tape->ascq == 0x2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | pc->error = IDETAPE_ERROR_EOD; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 631 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | } |
| 633 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 634 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 635 | if (tape->sense_key == 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | pc->error = IDETAPE_ERROR_EOD; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 637 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 639 | if (!(pc->flags & PC_FLAG_ABORT) && |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 640 | pc->xferred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
| 642 | } |
| 643 | } |
| 644 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 645 | /* Free a stage along with its related buffers completely. */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 646 | static void __idetape_kfree_stage(idetape_stage_t *stage) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
| 648 | struct idetape_bh *prev_bh, *bh = stage->bh; |
| 649 | int size; |
| 650 | |
| 651 | while (bh != NULL) { |
| 652 | if (bh->b_data != NULL) { |
| 653 | size = (int) bh->b_size; |
| 654 | while (size > 0) { |
| 655 | free_page((unsigned long) bh->b_data); |
| 656 | size -= PAGE_SIZE; |
| 657 | bh->b_data += PAGE_SIZE; |
| 658 | } |
| 659 | } |
| 660 | prev_bh = bh; |
| 661 | bh = bh->b_reqnext; |
| 662 | kfree(prev_bh); |
| 663 | } |
| 664 | kfree(stage); |
| 665 | } |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 668 | * Finish servicing a request and insert a pending pipeline request into the |
| 669 | * main device queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | */ |
| 671 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
| 672 | { |
| 673 | struct request *rq = HWGROUP(drive)->rq; |
| 674 | idetape_tape_t *tape = drive->driver_data; |
| 675 | unsigned long flags; |
| 676 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 678 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | switch (uptodate) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 681 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
| 682 | case 1: error = 0; break; |
| 683 | default: error = uptodate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } |
| 685 | rq->errors = error; |
| 686 | if (error) |
| 687 | tape->failed_pc = NULL; |
| 688 | |
Bartlomiej Zolnierkiewicz | 3687221 | 2008-01-26 20:13:10 +0100 | [diff] [blame] | 689 | if (!blk_special_request(rq)) { |
| 690 | ide_end_request(drive, uptodate, nr_sects); |
| 691 | return 0; |
| 692 | } |
| 693 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 694 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | ide_end_drive_cmd(drive, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Borislav Petkov | 189bb3b | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 698 | clear_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 699 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | return 0; |
| 701 | } |
| 702 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 703 | static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
| 705 | idetape_tape_t *tape = drive->driver_data; |
| 706 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 707 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 708 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | if (!tape->pc->error) { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 710 | idetape_analyze_error(drive, tape->pc->buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | idetape_end_request(drive, 1, 0); |
| 712 | } else { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 713 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - " |
| 714 | "Aborting request!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | idetape_end_request(drive, 0, 0); |
| 716 | } |
| 717 | return ide_stopped; |
| 718 | } |
| 719 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 720 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 722 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 723 | pc->c[0] = REQUEST_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | pc->c[4] = 20; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 725 | pc->req_xfer = 20; |
| 726 | pc->idetape_callback = &idetape_request_sense_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | |
| 729 | static void idetape_init_rq(struct request *rq, u8 cmd) |
| 730 | { |
| 731 | memset(rq, 0, sizeof(*rq)); |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 732 | rq->cmd_type = REQ_TYPE_SPECIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | rq->cmd[0] = cmd; |
| 734 | } |
| 735 | |
| 736 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 737 | * Generate a new packet command request in front of the request queue, before |
| 738 | * the current request, so that it will be processed immediately, on the next |
| 739 | * pass through the driver. The function below is called from the request |
| 740 | * handling part of the driver (the "bottom" part). Safe storage for the request |
| 741 | * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 743 | * Memory for those requests is pre-allocated at initialization time, and is |
| 744 | * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for |
| 745 | * the maximum possible number of inter-dependent packet commands. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 747 | * The higher level of the driver - The ioctl handler and the character device |
| 748 | * handling functions should queue request to the lower level part and wait for |
| 749 | * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 751 | static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 752 | struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | { |
| 754 | struct ide_tape_obj *tape = drive->driver_data; |
| 755 | |
| 756 | idetape_init_rq(rq, REQ_IDETAPE_PC1); |
| 757 | rq->buffer = (char *) pc; |
| 758 | rq->rq_disk = tape->disk; |
| 759 | (void) ide_do_drive_cmd(drive, rq, ide_preempt); |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * idetape_retry_pc is called when an error was detected during the |
| 764 | * last packet command. We queue a request sense packet command in |
| 765 | * the head of the request list. |
| 766 | */ |
| 767 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) |
| 768 | { |
| 769 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 770 | struct ide_atapi_pc *pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | struct request *rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Bartlomiej Zolnierkiewicz | 64a57fe | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 773 | (void)ide_read_error(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | pc = idetape_next_pc_storage(drive); |
| 775 | rq = idetape_next_rq_storage(drive); |
| 776 | idetape_create_request_sense_cmd(pc); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 777 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | idetape_queue_pc_head(drive, pc, rq); |
| 779 | return ide_stopped; |
| 780 | } |
| 781 | |
| 782 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 783 | * Postpone the current request so that ide.c will be able to service requests |
| 784 | * from another device on the same hwgroup while we are polling for DSC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 786 | static void idetape_postpone_request(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | { |
| 788 | idetape_tape_t *tape = drive->driver_data; |
| 789 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 790 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | tape->postponed_rq = HWGROUP(drive)->rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 793 | ide_stall_queue(drive, tape->dsc_poll_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
| 795 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 796 | typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int); |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | /* |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 799 | * This is the usual interrupt handler which will be called during a packet |
| 800 | * command. We will transfer some of the data (as requested by the drive) and |
| 801 | * will re-point interrupt handler to us. When data transfer is finished, we |
| 802 | * will act according to the algorithm described before |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 803 | * idetape_issue_pc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | */ |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 805 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | { |
| 807 | ide_hwif_t *hwif = drive->hwif; |
| 808 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 809 | struct ide_atapi_pc *pc = tape->pc; |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 810 | xfer_func_t *xferfunc; |
| 811 | idetape_io_buf *iobuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | unsigned int temp; |
| 813 | #if SIMULATE_ERRORS |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 814 | static int error_sim_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | #endif |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 816 | u16 bcount; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 817 | u8 stat, ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 819 | debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | /* Clear the interrupt */ |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 822 | stat = ide_read_status(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 824 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 825 | if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | /* |
| 827 | * A DMA error is sometimes expected. For example, |
| 828 | * if the tape is crossing a filemark during a |
| 829 | * READ command, it will issue an irq and position |
| 830 | * itself before the filemark, so that only a partial |
| 831 | * data transfer will occur (which causes the DMA |
| 832 | * error). In that case, we will later ask the tape |
| 833 | * how much bytes of the original request were |
| 834 | * actually transferred (we can't receive that |
| 835 | * information from the DMA engine on most chipsets). |
| 836 | */ |
| 837 | |
| 838 | /* |
| 839 | * On the contrary, a DMA error is never expected; |
| 840 | * it usually indicates a hardware error or abort. |
| 841 | * If the tape crosses a filemark during a READ |
| 842 | * command, it will issue an irq and position itself |
| 843 | * after the filemark (not before). Only a partial |
| 844 | * data transfer will occur, but no DMA error. |
| 845 | * (AS, 19 Apr 2001) |
| 846 | */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 847 | pc->flags |= PC_FLAG_DMA_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } else { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 849 | pc->xferred = pc->req_xfer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | idetape_update_buffers(pc); |
| 851 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 852 | debug_log(DBG_PROCS, "DMA finished\n"); |
| 853 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | /* No more interrupts */ |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 857 | if ((stat & DRQ_STAT) == 0) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 858 | debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 859 | " transferred\n", pc->xferred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 861 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | local_irq_enable(); |
| 863 | |
| 864 | #if SIMULATE_ERRORS |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 865 | if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | (++error_sim_count % 100) == 0) { |
| 867 | printk(KERN_INFO "ide-tape: %s: simulating error\n", |
| 868 | tape->name); |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 869 | stat |= ERR_STAT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | #endif |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 872 | if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 873 | stat &= ~ERR_STAT; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 874 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 875 | /* Error detected */ |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 876 | debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
| 877 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 878 | if (pc->c[0] == REQUEST_SENSE) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 879 | printk(KERN_ERR "ide-tape: I/O error in request" |
| 880 | " sense command\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | return ide_do_reset(drive); |
| 882 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 883 | debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
| 884 | pc->c[0]); |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | /* Retry operation */ |
| 887 | return idetape_retry_pc(drive); |
| 888 | } |
| 889 | pc->error = 0; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 890 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 891 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | /* Media access command */ |
| 893 | tape->dsc_polling_start = jiffies; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 894 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
| 896 | /* Allow ide.c to handle other requests */ |
| 897 | idetape_postpone_request(drive); |
| 898 | return ide_stopped; |
| 899 | } |
| 900 | if (tape->failed_pc == pc) |
| 901 | tape->failed_pc = NULL; |
| 902 | /* Command finished - Call the callback function */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 903 | return pc->idetape_callback(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 905 | |
| 906 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
| 907 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | printk(KERN_ERR "ide-tape: The tape wants to issue more " |
| 909 | "interrupts in DMA mode\n"); |
| 910 | printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 911 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | return ide_do_reset(drive); |
| 913 | } |
| 914 | /* Get the number of bytes to transfer on this interrupt. */ |
Bartlomiej Zolnierkiewicz | 23579a2 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 915 | bcount = (hwif->INB(hwif->io_ports[IDE_BCOUNTH_OFFSET]) << 8) | |
| 916 | hwif->INB(hwif->io_ports[IDE_BCOUNTL_OFFSET]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
Bartlomiej Zolnierkiewicz | 23579a2 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 918 | ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 920 | if (ireason & CD) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 921 | printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | return ide_do_reset(drive); |
| 923 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 924 | if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | /* Hopefully, we will never get here */ |
| 926 | printk(KERN_ERR "ide-tape: We wanted to %s, ", |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 927 | (ireason & IO) ? "Write" : "Read"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 929 | (ireason & IO) ? "Read" : "Write"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | return ide_do_reset(drive); |
| 931 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 932 | if (!(pc->flags & PC_FLAG_WRITING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | /* Reading - Check that we have enough space */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 934 | temp = pc->xferred + bcount; |
| 935 | if (temp > pc->req_xfer) { |
| 936 | if (temp > pc->buf_size) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 937 | printk(KERN_ERR "ide-tape: The tape wants to " |
| 938 | "send us more data than expected " |
| 939 | "- discarding data\n"); |
Bartlomiej Zolnierkiewicz | 7616c0a | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 940 | ide_atapi_discard_data(drive, bcount); |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 941 | ide_set_handler(drive, &idetape_pc_intr, |
| 942 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | return ide_started; |
| 944 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 945 | debug_log(DBG_SENSE, "The tape wants to send us more " |
| 946 | "data than expected - allowing transfer\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 948 | iobuf = &idetape_input_buffers; |
| 949 | xferfunc = hwif->atapi_input_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } else { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 951 | iobuf = &idetape_output_buffers; |
| 952 | xferfunc = hwif->atapi_output_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | } |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 954 | |
| 955 | if (pc->bh) |
| 956 | iobuf(drive, pc, bcount); |
| 957 | else |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 958 | xferfunc(drive, pc->cur_pos, bcount); |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | /* Update the current position */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 961 | pc->xferred += bcount; |
| 962 | pc->cur_pos += bcount; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 963 | |
| 964 | debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", |
| 965 | pc->c[0], bcount); |
| 966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | /* And set the interrupt handler again */ |
| 968 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 969 | return ide_started; |
| 970 | } |
| 971 | |
| 972 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 973 | * Packet Command Interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 975 | * The current Packet Command is available in tape->pc, and will not change |
| 976 | * until we finish handling it. Each packet command is associated with a |
| 977 | * callback function that will be called when the command is finished. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 979 | * The handling will be done in three stages: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 981 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
| 982 | * the interrupt handler to idetape_pc_intr. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 984 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
| 985 | * repeated until the device signals us that no more interrupts will be issued. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 987 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
| 988 | * process. In case of a successful initiation of a media access packet command, |
| 989 | * the DSC bit will be set when the actual execution of the command is finished. |
| 990 | * Since the tape drive will not issue an interrupt, we have to poll for this |
| 991 | * event. In this case, we define the request as "low priority request" by |
| 992 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and |
| 993 | * exit the driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 995 | * ide.c will then give higher priority to requests which originate from the |
| 996 | * other device, until will change rq_status to RQ_ACTIVE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 998 | * 4. When the packet command is finished, it will be checked for errors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1000 | * 5. In case an error was found, we queue a request sense packet command in |
| 1001 | * front of the request queue and retry the operation up to |
| 1002 | * IDETAPE_MAX_PC_RETRIES times. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1004 | * 6. In case no error was found, or we decided to give up and not to retry |
| 1005 | * again, the callback function will be called and then we will handle the next |
| 1006 | * request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | */ |
| 1008 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
| 1009 | { |
| 1010 | ide_hwif_t *hwif = drive->hwif; |
| 1011 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1012 | struct ide_atapi_pc *pc = tape->pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | int retries = 100; |
| 1014 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1015 | u8 ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1017 | if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { |
| 1018 | printk(KERN_ERR "ide-tape: Strange, packet command initiated " |
| 1019 | "yet DRQ isn't asserted\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | return startstop; |
| 1021 | } |
Bartlomiej Zolnierkiewicz | 23579a2 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1022 | ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1023 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
| 1025 | "a packet command, retrying\n"); |
| 1026 | udelay(100); |
Bartlomiej Zolnierkiewicz | 23579a2 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1027 | ireason = hwif->INB(hwif->io_ports[IDE_IREASON_OFFSET]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | if (retries == 0) { |
| 1029 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " |
| 1030 | "issuing a packet command, ignoring\n"); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1031 | ireason |= CD; |
| 1032 | ireason &= ~IO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | } |
| 1034 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1035 | if ((ireason & CD) == 0 || (ireason & IO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
| 1037 | "a packet command\n"); |
| 1038 | return ide_do_reset(drive); |
| 1039 | } |
| 1040 | /* Set the interrupt routine */ |
| 1041 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 1042 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 1043 | /* Begin DMA, if necessary */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1044 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 1045 | hwif->dma_ops->dma_start(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | #endif |
| 1047 | /* Send the actual packet */ |
| 1048 | HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); |
| 1049 | return ide_started; |
| 1050 | } |
| 1051 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1052 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
| 1053 | struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | { |
| 1055 | ide_hwif_t *hwif = drive->hwif; |
| 1056 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | int dma_ok = 0; |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1058 | u16 bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1060 | if (tape->pc->c[0] == REQUEST_SENSE && |
| 1061 | pc->c[0] == REQUEST_SENSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
| 1063 | "Two request sense in serial were issued\n"); |
| 1064 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1066 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | tape->failed_pc = pc; |
| 1068 | /* Set the current packet command */ |
| 1069 | tape->pc = pc; |
| 1070 | |
| 1071 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1072 | (pc->flags & PC_FLAG_ABORT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1074 | * We will "abort" retrying a packet command in case legitimate |
| 1075 | * error code was received (crossing a filemark, or end of the |
| 1076 | * media, for example). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1078 | if (!(pc->flags & PC_FLAG_ABORT)) { |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1079 | if (!(pc->c[0] == TEST_UNIT_READY && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | tape->sense_key == 2 && tape->asc == 4 && |
| 1081 | (tape->ascq == 1 || tape->ascq == 8))) { |
| 1082 | printk(KERN_ERR "ide-tape: %s: I/O error, " |
| 1083 | "pc = %2x, key = %2x, " |
| 1084 | "asc = %2x, ascq = %2x\n", |
| 1085 | tape->name, pc->c[0], |
| 1086 | tape->sense_key, tape->asc, |
| 1087 | tape->ascq); |
| 1088 | } |
| 1089 | /* Giving up */ |
| 1090 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1091 | } |
| 1092 | tape->failed_pc = NULL; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1093 | return pc->idetape_callback(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1095 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
| 1097 | pc->retries++; |
| 1098 | /* We haven't transferred any data yet */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1099 | pc->xferred = 0; |
| 1100 | pc->cur_pos = pc->buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | /* Request to transfer the entire buffer at once */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1102 | bcount = pc->req_xfer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1104 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
| 1105 | pc->flags &= ~PC_FLAG_DMA_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | printk(KERN_WARNING "ide-tape: DMA disabled, " |
| 1107 | "reverting to PIO\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 1108 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1110 | if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma) |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 1111 | dma_ok = !hwif->dma_ops->dma_setup(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1113 | ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | |
| 1114 | IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); |
| 1115 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1116 | if (dma_ok) |
| 1117 | /* Will begin DMA later */ |
| 1118 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; |
| 1119 | if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) { |
Bartlomiej Zolnierkiewicz | c1c9dbc | 2008-02-02 19:56:44 +0100 | [diff] [blame] | 1120 | ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
| 1121 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | return ide_started; |
| 1123 | } else { |
Bartlomiej Zolnierkiewicz | 23579a2 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1124 | hwif->OUTB(WIN_PACKETCMD, hwif->io_ports[IDE_COMMAND_OFFSET]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | return idetape_transfer_pc(drive); |
| 1126 | } |
| 1127 | } |
| 1128 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1129 | static ide_startstop_t idetape_pc_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | { |
| 1131 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1132 | |
| 1133 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
| 1135 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); |
| 1136 | return ide_stopped; |
| 1137 | } |
| 1138 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1139 | /* A mode sense command is used to "sense" tape parameters. */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1140 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | { |
| 1142 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1143 | pc->c[0] = MODE_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1145 | /* DBD = 1 - Don't return block descriptors */ |
| 1146 | pc->c[1] = 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | pc->c[2] = page_code; |
| 1148 | /* |
| 1149 | * Changed pc->c[3] to 0 (255 will at best return unused info). |
| 1150 | * |
| 1151 | * For SCSI this byte is defined as subpage instead of high byte |
| 1152 | * of length and some IDE drives seem to interpret it this way |
| 1153 | * and return an error when 255 is used. |
| 1154 | */ |
| 1155 | pc->c[3] = 0; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1156 | /* We will just discard data in that case */ |
| 1157 | pc->c[4] = 255; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1159 | pc->req_xfer = 12; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1161 | pc->req_xfer = 24; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | else |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1163 | pc->req_xfer = 50; |
| 1164 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1167 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | { |
| 1169 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1170 | struct ide_atapi_pc *pc = tape->pc; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1171 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1173 | stat = ide_read_status(drive); |
| 1174 | |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1175 | if (stat & SEEK_STAT) { |
| 1176 | if (stat & ERR_STAT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | /* Error detected */ |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1178 | if (pc->c[0] != TEST_UNIT_READY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
| 1180 | tape->name); |
| 1181 | /* Retry operation */ |
| 1182 | return idetape_retry_pc(drive); |
| 1183 | } |
| 1184 | pc->error = 0; |
| 1185 | if (tape->failed_pc == pc) |
| 1186 | tape->failed_pc = NULL; |
| 1187 | } else { |
| 1188 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1189 | tape->failed_pc = NULL; |
| 1190 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1191 | return pc->idetape_callback(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | } |
| 1193 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1194 | static ide_startstop_t idetape_rw_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | { |
| 1196 | idetape_tape_t *tape = drive->driver_data; |
| 1197 | struct request *rq = HWGROUP(drive)->rq; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1198 | int blocks = tape->pc->xferred / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1200 | tape->avg_size += blocks * tape->blk_size; |
| 1201 | tape->insert_size += blocks * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | if (tape->insert_size > 1024 * 1024) |
| 1203 | tape->measure_insert_time = 1; |
| 1204 | if (tape->measure_insert_time) { |
| 1205 | tape->measure_insert_time = 0; |
| 1206 | tape->insert_time = jiffies; |
| 1207 | tape->insert_size = 0; |
| 1208 | } |
| 1209 | if (time_after(jiffies, tape->insert_time)) |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1210 | tape->insert_speed = tape->insert_size / 1024 * HZ / |
| 1211 | (jiffies - tape->insert_time); |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 1212 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1213 | tape->avg_speed = tape->avg_size * HZ / |
| 1214 | (jiffies - tape->avg_time) / 1024; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | tape->avg_size = 0; |
| 1216 | tape->avg_time = jiffies; |
| 1217 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1218 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1220 | tape->first_frame += blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | rq->current_nr_sectors -= blocks; |
| 1222 | |
| 1223 | if (!tape->pc->error) |
| 1224 | idetape_end_request(drive, 1, 0); |
| 1225 | else |
| 1226 | idetape_end_request(drive, tape->pc->error, 0); |
| 1227 | return ide_stopped; |
| 1228 | } |
| 1229 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1230 | static void idetape_create_read_cmd(idetape_tape_t *tape, |
| 1231 | struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1232 | unsigned int length, struct idetape_bh *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | { |
| 1234 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1235 | pc->c[0] = READ_6; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1236 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | pc->c[1] = 1; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1238 | pc->idetape_callback = &idetape_rw_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | pc->bh = bh; |
| 1240 | atomic_set(&bh->b_count, 0); |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1241 | pc->buf = NULL; |
| 1242 | pc->buf_size = length * tape->blk_size; |
| 1243 | pc->req_xfer = pc->buf_size; |
| 1244 | if (pc->req_xfer == tape->stage_size) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1245 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | } |
| 1247 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1248 | static void idetape_create_write_cmd(idetape_tape_t *tape, |
| 1249 | struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1250 | unsigned int length, struct idetape_bh *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | { |
| 1252 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1253 | pc->c[0] = WRITE_6; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1254 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | pc->c[1] = 1; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1256 | pc->idetape_callback = &idetape_rw_callback; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1257 | pc->flags |= PC_FLAG_WRITING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | pc->bh = bh; |
| 1259 | pc->b_data = bh->b_data; |
| 1260 | pc->b_count = atomic_read(&bh->b_count); |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1261 | pc->buf = NULL; |
| 1262 | pc->buf_size = length * tape->blk_size; |
| 1263 | pc->req_xfer = pc->buf_size; |
| 1264 | if (pc->req_xfer == tape->stage_size) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1265 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | } |
| 1267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
| 1269 | struct request *rq, sector_t block) |
| 1270 | { |
| 1271 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1272 | struct ide_atapi_pc *pc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | struct request *postponed_rq = tape->postponed_rq; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1274 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1276 | debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
| 1277 | " current_nr_sectors: %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1280 | if (!blk_special_request(rq)) { |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1281 | /* We do not support buffer cache originated requests. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1283 | "request queue (%d)\n", drive->name, rq->cmd_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | ide_end_request(drive, 0, 0); |
| 1285 | return ide_stopped; |
| 1286 | } |
| 1287 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1288 | /* Retry a failed packet command */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1289 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1290 | return idetape_issue_pc(drive, tape->failed_pc); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | if (postponed_rq != NULL) |
| 1293 | if (rq != postponed_rq) { |
| 1294 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " |
| 1295 | "Two DSC requests were queued\n"); |
| 1296 | idetape_end_request(drive, 0, 0); |
| 1297 | return ide_stopped; |
| 1298 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
| 1300 | tape->postponed_rq = NULL; |
| 1301 | |
| 1302 | /* |
| 1303 | * If the tape is still busy, postpone our request and service |
| 1304 | * the other device meanwhile. |
| 1305 | */ |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1306 | stat = ide_read_status(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | |
| 1308 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1309 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | |
| 1311 | if (drive->post_reset == 1) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1312 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | drive->post_reset = 0; |
| 1314 | } |
| 1315 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | if (time_after(jiffies, tape->insert_time)) |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1317 | tape->insert_speed = tape->insert_size / 1024 * HZ / |
| 1318 | (jiffies - tape->insert_time); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1319 | if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1320 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | if (postponed_rq == NULL) { |
| 1322 | tape->dsc_polling_start = jiffies; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1323 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
| 1325 | } else if (time_after(jiffies, tape->dsc_timeout)) { |
| 1326 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", |
| 1327 | tape->name); |
| 1328 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 1329 | idetape_media_access_finished(drive); |
| 1330 | return ide_stopped; |
| 1331 | } else { |
| 1332 | return ide_do_reset(drive); |
| 1333 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1334 | } else if (time_after(jiffies, |
| 1335 | tape->dsc_polling_start + |
| 1336 | IDETAPE_DSC_MA_THRESHOLD)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1337 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | idetape_postpone_request(drive); |
| 1339 | return ide_stopped; |
| 1340 | } |
| 1341 | if (rq->cmd[0] & REQ_IDETAPE_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | tape->postpone_cnt = 0; |
| 1343 | pc = idetape_next_pc_storage(drive); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1344 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, |
| 1345 | (struct idetape_bh *)rq->special); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | goto out; |
| 1347 | } |
| 1348 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | tape->postpone_cnt = 0; |
| 1350 | pc = idetape_next_pc_storage(drive); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1351 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, |
| 1352 | (struct idetape_bh *)rq->special); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | goto out; |
| 1354 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1356 | pc = (struct ide_atapi_pc *) rq->buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
| 1358 | rq->cmd[0] |= REQ_IDETAPE_PC2; |
| 1359 | goto out; |
| 1360 | } |
| 1361 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 1362 | idetape_media_access_finished(drive); |
| 1363 | return ide_stopped; |
| 1364 | } |
| 1365 | BUG(); |
| 1366 | out: |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1367 | return idetape_issue_pc(drive, pc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | } |
| 1369 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1370 | /* Pipeline related functions */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | |
| 1372 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1373 | * The function below uses __get_free_page to allocate a pipeline stage, along |
| 1374 | * with all the necessary small buffers which together make a buffer of size |
| 1375 | * tape->stage_size (or a bit more). We attempt to combine sequential pages as |
| 1376 | * much as possible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1378 | * It returns a pointer to the new allocated stage, or NULL if we can't (or |
| 1379 | * don't want to) allocate a stage. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1381 | * Pipeline stages are optional and are used to increase performance. If we |
| 1382 | * can't allocate them, we'll manage without them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1384 | static idetape_stage_t *__idetape_kmalloc_stage(idetape_tape_t *tape, int full, |
| 1385 | int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | { |
| 1387 | idetape_stage_t *stage; |
| 1388 | struct idetape_bh *prev_bh, *bh; |
| 1389 | int pages = tape->pages_per_stage; |
| 1390 | char *b_data = NULL; |
| 1391 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1392 | stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL); |
| 1393 | if (!stage) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | return NULL; |
| 1395 | stage->next = NULL; |
| 1396 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1397 | stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
| 1398 | bh = stage->bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | if (bh == NULL) |
| 1400 | goto abort; |
| 1401 | bh->b_reqnext = NULL; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1402 | bh->b_data = (char *) __get_free_page(GFP_KERNEL); |
| 1403 | if (!bh->b_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | goto abort; |
| 1405 | if (clear) |
| 1406 | memset(bh->b_data, 0, PAGE_SIZE); |
| 1407 | bh->b_size = PAGE_SIZE; |
| 1408 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 1409 | |
| 1410 | while (--pages) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1411 | b_data = (char *) __get_free_page(GFP_KERNEL); |
| 1412 | if (!b_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | goto abort; |
| 1414 | if (clear) |
| 1415 | memset(b_data, 0, PAGE_SIZE); |
| 1416 | if (bh->b_data == b_data + PAGE_SIZE) { |
| 1417 | bh->b_size += PAGE_SIZE; |
| 1418 | bh->b_data -= PAGE_SIZE; |
| 1419 | if (full) |
| 1420 | atomic_add(PAGE_SIZE, &bh->b_count); |
| 1421 | continue; |
| 1422 | } |
| 1423 | if (b_data == bh->b_data + bh->b_size) { |
| 1424 | bh->b_size += PAGE_SIZE; |
| 1425 | if (full) |
| 1426 | atomic_add(PAGE_SIZE, &bh->b_count); |
| 1427 | continue; |
| 1428 | } |
| 1429 | prev_bh = bh; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1430 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
| 1431 | if (!bh) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | free_page((unsigned long) b_data); |
| 1433 | goto abort; |
| 1434 | } |
| 1435 | bh->b_reqnext = NULL; |
| 1436 | bh->b_data = b_data; |
| 1437 | bh->b_size = PAGE_SIZE; |
| 1438 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 1439 | prev_bh->b_reqnext = bh; |
| 1440 | } |
| 1441 | bh->b_size -= tape->excess_bh_size; |
| 1442 | if (full) |
| 1443 | atomic_sub(tape->excess_bh_size, &bh->b_count); |
| 1444 | return stage; |
| 1445 | abort: |
| 1446 | __idetape_kfree_stage(stage); |
| 1447 | return NULL; |
| 1448 | } |
| 1449 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1450 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 1451 | const char __user *buf, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | { |
| 1453 | struct idetape_bh *bh = tape->bh; |
| 1454 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1455 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | |
| 1457 | while (n) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1459 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 1460 | __func__); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1461 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1463 | count = min((unsigned int) |
| 1464 | (bh->b_size - atomic_read(&bh->b_count)), |
| 1465 | (unsigned int)n); |
| 1466 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, |
| 1467 | count)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1468 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | n -= count; |
| 1470 | atomic_add(count, &bh->b_count); |
| 1471 | buf += count; |
| 1472 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 1473 | bh = bh->b_reqnext; |
| 1474 | if (bh) |
| 1475 | atomic_set(&bh->b_count, 0); |
| 1476 | } |
| 1477 | } |
| 1478 | tape->bh = bh; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1479 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | } |
| 1481 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1482 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 1483 | int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | { |
| 1485 | struct idetape_bh *bh = tape->bh; |
| 1486 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1487 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | |
| 1489 | while (n) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1491 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 1492 | __func__); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1493 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | count = min(tape->b_count, n); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1496 | if (copy_to_user(buf, tape->b_data, count)) |
| 1497 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | n -= count; |
| 1499 | tape->b_data += count; |
| 1500 | tape->b_count -= count; |
| 1501 | buf += count; |
| 1502 | if (!tape->b_count) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1503 | bh = bh->b_reqnext; |
| 1504 | tape->bh = bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | if (bh) { |
| 1506 | tape->b_data = bh->b_data; |
| 1507 | tape->b_count = atomic_read(&bh->b_count); |
| 1508 | } |
| 1509 | } |
| 1510 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1511 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | } |
| 1513 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1514 | static void idetape_init_merge_stage(idetape_tape_t *tape) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | { |
| 1516 | struct idetape_bh *bh = tape->merge_stage->bh; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1517 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | tape->bh = bh; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1519 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | atomic_set(&bh->b_count, 0); |
| 1521 | else { |
| 1522 | tape->b_data = bh->b_data; |
| 1523 | tape->b_count = atomic_read(&bh->b_count); |
| 1524 | } |
| 1525 | } |
| 1526 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1527 | static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | { |
| 1529 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1530 | u8 *readpos = tape->pc->buf; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1531 | |
| 1532 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
| 1534 | if (!tape->pc->error) { |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1535 | debug_log(DBG_SENSE, "BOP - %s\n", |
| 1536 | (readpos[0] & 0x80) ? "Yes" : "No"); |
| 1537 | debug_log(DBG_SENSE, "EOP - %s\n", |
| 1538 | (readpos[0] & 0x40) ? "Yes" : "No"); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1539 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1540 | if (readpos[0] & 0x4) { |
| 1541 | printk(KERN_INFO "ide-tape: Block location is unknown" |
| 1542 | "to the tape\n"); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1543 | clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | idetape_end_request(drive, 0, 0); |
| 1545 | } else { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1546 | debug_log(DBG_SENSE, "Block Location - %u\n", |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1547 | be32_to_cpu(*(u32 *)&readpos[4])); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1548 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1549 | tape->partition = readpos[1]; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1550 | tape->first_frame = |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1551 | be32_to_cpu(*(u32 *)&readpos[4]); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1552 | set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | idetape_end_request(drive, 1, 0); |
| 1554 | } |
| 1555 | } else { |
| 1556 | idetape_end_request(drive, 0, 0); |
| 1557 | } |
| 1558 | return ide_stopped; |
| 1559 | } |
| 1560 | |
| 1561 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1562 | * Write a filemark if write_filemark=1. Flush the device buffers without |
| 1563 | * writing a filemark otherwise. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1565 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1566 | struct ide_atapi_pc *pc, int write_filemark) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | { |
| 1568 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1569 | pc->c[0] = WRITE_FILEMARKS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | pc->c[4] = write_filemark; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1571 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1572 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | } |
| 1574 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1575 | static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | { |
| 1577 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1578 | pc->c[0] = TEST_UNIT_READY; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1579 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | } |
| 1581 | |
| 1582 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1583 | * We add a special packet command request to the tail of the request queue, and |
| 1584 | * wait for it to be serviced. This is not to be called from within the request |
| 1585 | * handling part of the driver! We allocate here data on the stack and it is |
| 1586 | * valid until the request is finished. This is not the case for the bottom part |
| 1587 | * of the driver, where we are always leaving the functions to wait for an |
| 1588 | * interrupt or a timer event. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1590 | * From the bottom part of the driver, we should allocate safe memory using |
| 1591 | * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request |
| 1592 | * to the request list without waiting for it to be serviced! In that case, we |
| 1593 | * usually use idetape_queue_pc_head(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | */ |
Borislav Petkov | ea1ab3d | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1595 | static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | { |
| 1597 | struct ide_tape_obj *tape = drive->driver_data; |
| 1598 | struct request rq; |
| 1599 | |
| 1600 | idetape_init_rq(&rq, REQ_IDETAPE_PC1); |
| 1601 | rq.buffer = (char *) pc; |
| 1602 | rq.rq_disk = tape->disk; |
| 1603 | return ide_do_drive_cmd(drive, &rq, ide_wait); |
| 1604 | } |
| 1605 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1606 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
| 1607 | struct ide_atapi_pc *pc, int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | { |
| 1609 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1610 | pc->c[0] = START_STOP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | pc->c[4] = cmd; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1612 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1613 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | } |
| 1615 | |
| 1616 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
| 1617 | { |
| 1618 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1619 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | int load_attempted = 0; |
| 1621 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1622 | /* Wait for the tape to become ready */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1623 | set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | timeout += jiffies; |
| 1625 | while (time_before(jiffies, timeout)) { |
| 1626 | idetape_create_test_unit_ready_cmd(&pc); |
Borislav Petkov | ea1ab3d | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1627 | if (!idetape_queue_pc_tail(drive, &pc)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | return 0; |
| 1629 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1630 | || (tape->asc == 0x3A)) { |
| 1631 | /* no media */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | if (load_attempted) |
| 1633 | return -ENOMEDIUM; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1634 | idetape_create_load_unload_cmd(drive, &pc, |
| 1635 | IDETAPE_LU_LOAD_MASK); |
Borislav Petkov | ea1ab3d | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1636 | idetape_queue_pc_tail(drive, &pc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | load_attempted = 1; |
| 1638 | /* not about to be ready */ |
| 1639 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && |
| 1640 | (tape->ascq == 1 || tape->ascq == 8))) |
| 1641 | return -EIO; |
Nishanth Aravamudan | 80ce45f | 2005-09-10 00:27:08 -0700 | [diff] [blame] | 1642 | msleep(100); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | } |
| 1644 | return -EIO; |
| 1645 | } |
| 1646 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1647 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1649 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | int rc; |
| 1651 | |
| 1652 | idetape_create_write_filemark_cmd(drive, &pc, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1653 | rc = idetape_queue_pc_tail(drive, &pc); |
| 1654 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | return rc; |
| 1656 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 1657 | return 0; |
| 1658 | } |
| 1659 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1660 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | { |
| 1662 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1663 | pc->c[0] = READ_POSITION; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1664 | pc->req_xfer = 20; |
| 1665 | pc->idetape_callback = &idetape_read_position_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | } |
| 1667 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1668 | static int idetape_read_position(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | { |
| 1670 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1671 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | int position; |
| 1673 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1674 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | |
| 1676 | idetape_create_read_position_cmd(&pc); |
| 1677 | if (idetape_queue_pc_tail(drive, &pc)) |
| 1678 | return -1; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1679 | position = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | return position; |
| 1681 | } |
| 1682 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1683 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
| 1684 | struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1685 | unsigned int block, u8 partition, int skip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | { |
| 1687 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1688 | pc->c[0] = POSITION_TO_ELEMENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | pc->c[1] = 2; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1690 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | pc->c[8] = partition; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1692 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1693 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | } |
| 1695 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1696 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
| 1697 | struct ide_atapi_pc *pc, int prevent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | { |
| 1699 | idetape_tape_t *tape = drive->driver_data; |
| 1700 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 1701 | /* device supports locking according to capabilities page */ |
| 1702 | if (!(tape->caps[6] & 0x01)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | return 0; |
| 1704 | |
| 1705 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1706 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | pc->c[4] = prevent; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1708 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | return 1; |
| 1710 | } |
| 1711 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1712 | static int __idetape_discard_read_pipeline(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | { |
| 1714 | idetape_tape_t *tape = drive->driver_data; |
| 1715 | unsigned long flags; |
| 1716 | int cnt; |
| 1717 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1718 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | return 0; |
| 1720 | |
| 1721 | /* Remove merge stage. */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1722 | cnt = tape->merge_stage_size / tape->blk_size; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1723 | if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | ++cnt; /* Filemarks count as 1 sector */ |
| 1725 | tape->merge_stage_size = 0; |
| 1726 | if (tape->merge_stage != NULL) { |
| 1727 | __idetape_kfree_stage(tape->merge_stage); |
| 1728 | tape->merge_stage = NULL; |
| 1729 | } |
| 1730 | |
| 1731 | /* Clear pipeline flags. */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1732 | clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1733 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | |
| 1735 | /* Remove pipeline stages. */ |
| 1736 | if (tape->first_stage == NULL) |
| 1737 | return 0; |
| 1738 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1739 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | tape->next_stage = NULL; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1741 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | |
| 1743 | while (tape->first_stage != NULL) { |
| 1744 | struct request *rq_ptr = &tape->first_stage->rq; |
| 1745 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1746 | cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) |
| 1748 | ++cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | } |
| 1750 | tape->nr_pending_stages = 0; |
| 1751 | tape->max_stages = tape->min_pipeline; |
| 1752 | return cnt; |
| 1753 | } |
| 1754 | |
| 1755 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1756 | * Position the tape to the requested block using the LOCATE packet command. |
| 1757 | * A READ POSITION command is then issued to check where we are positioned. Like |
| 1758 | * all higher level operations, we queue the commands at the tail of the request |
| 1759 | * queue and wait for their completion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1761 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
| 1762 | u8 partition, int skip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | { |
| 1764 | idetape_tape_t *tape = drive->driver_data; |
| 1765 | int retval; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1766 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1768 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | __idetape_discard_read_pipeline(drive); |
| 1770 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 1771 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); |
| 1772 | retval = idetape_queue_pc_tail(drive, &pc); |
| 1773 | if (retval) |
| 1774 | return (retval); |
| 1775 | |
| 1776 | idetape_create_read_position_cmd(&pc); |
| 1777 | return (idetape_queue_pc_tail(drive, &pc)); |
| 1778 | } |
| 1779 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1780 | static void idetape_discard_read_pipeline(ide_drive_t *drive, |
| 1781 | int restore_position) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | { |
| 1783 | idetape_tape_t *tape = drive->driver_data; |
| 1784 | int cnt; |
| 1785 | int seek, position; |
| 1786 | |
| 1787 | cnt = __idetape_discard_read_pipeline(drive); |
| 1788 | if (restore_position) { |
| 1789 | position = idetape_read_position(drive); |
| 1790 | seek = position > cnt ? position - cnt : 0; |
| 1791 | if (idetape_position_tape(drive, seek, 0, 0)) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1792 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
| 1793 | " discard_pipeline()\n", tape->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | return; |
| 1795 | } |
| 1796 | } |
| 1797 | } |
| 1798 | |
| 1799 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1800 | * Generate a read/write request for the block device interface and wait for it |
| 1801 | * to be serviced. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1803 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
| 1804 | struct idetape_bh *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | { |
| 1806 | idetape_tape_t *tape = drive->driver_data; |
| 1807 | struct request rq; |
| 1808 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1809 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
| 1810 | |
Borislav Petkov | c4b22f8 | 2008-04-26 22:25:20 +0200 | [diff] [blame] | 1811 | if (test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1812 | printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n", |
| 1813 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | return (0); |
| 1815 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | |
| 1817 | idetape_init_rq(&rq, cmd); |
| 1818 | rq.rq_disk = tape->disk; |
| 1819 | rq.special = (void *)bh; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1820 | rq.sector = tape->first_frame; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1821 | rq.nr_sectors = blocks; |
| 1822 | rq.current_nr_sectors = blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); |
| 1824 | |
| 1825 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) |
| 1826 | return 0; |
| 1827 | |
| 1828 | if (tape->merge_stage) |
| 1829 | idetape_init_merge_stage(tape); |
| 1830 | if (rq.errors == IDETAPE_ERROR_GENERAL) |
| 1831 | return -EIO; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1832 | return (tape->blk_size * (blocks-rq.current_nr_sectors)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | } |
| 1834 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1835 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | { |
| 1837 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1838 | pc->c[0] = INQUIRY; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1839 | pc->c[4] = 254; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1840 | pc->req_xfer = 254; |
| 1841 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | } |
| 1843 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1844 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
| 1845 | struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | { |
| 1847 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1848 | pc->c[0] = REZERO_UNIT; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1849 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1850 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | } |
| 1852 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1853 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | { |
| 1855 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1856 | pc->c[0] = ERASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | pc->c[1] = 1; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1858 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1859 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | } |
| 1861 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1862 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | { |
| 1864 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1865 | pc->c[0] = SPACE; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1866 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | pc->c[1] = cmd; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1868 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1869 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | } |
| 1871 | |
Borislav Petkov | 97c566c | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 1872 | /* Queue up a character device originated write request. */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1873 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | { |
| 1875 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1877 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | |
Borislav Petkov | 0aa4b01 | 2008-04-27 15:38:27 +0200 | [diff] [blame^] | 1879 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
| 1880 | blocks, tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | } |
| 1882 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1883 | static void idetape_empty_write_pipeline(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | { |
| 1885 | idetape_tape_t *tape = drive->driver_data; |
| 1886 | int blocks, min; |
| 1887 | struct idetape_bh *bh; |
Borislav Petkov | 55a5d29 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 1888 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1889 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1890 | printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline," |
| 1891 | " but we are not writing.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | return; |
| 1893 | } |
| 1894 | if (tape->merge_stage_size > tape->stage_size) { |
| 1895 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
| 1896 | tape->merge_stage_size = tape->stage_size; |
| 1897 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | if (tape->merge_stage_size) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1899 | blocks = tape->merge_stage_size / tape->blk_size; |
| 1900 | if (tape->merge_stage_size % tape->blk_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | unsigned int i; |
| 1902 | |
| 1903 | blocks++; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1904 | i = tape->blk_size - tape->merge_stage_size % |
| 1905 | tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | bh = tape->bh->b_reqnext; |
| 1907 | while (bh) { |
| 1908 | atomic_set(&bh->b_count, 0); |
| 1909 | bh = bh->b_reqnext; |
| 1910 | } |
| 1911 | bh = tape->bh; |
| 1912 | while (i) { |
| 1913 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1914 | printk(KERN_INFO "ide-tape: bug," |
| 1915 | " bh NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | break; |
| 1917 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1918 | min = min(i, (unsigned int)(bh->b_size - |
| 1919 | atomic_read(&bh->b_count))); |
| 1920 | memset(bh->b_data + atomic_read(&bh->b_count), |
| 1921 | 0, min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | atomic_add(min, &bh->b_count); |
| 1923 | i -= min; |
| 1924 | bh = bh->b_reqnext; |
| 1925 | } |
| 1926 | } |
| 1927 | (void) idetape_add_chrdev_write_request(drive, blocks); |
| 1928 | tape->merge_stage_size = 0; |
| 1929 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | if (tape->merge_stage != NULL) { |
| 1931 | __idetape_kfree_stage(tape->merge_stage); |
| 1932 | tape->merge_stage = NULL; |
| 1933 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1934 | clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1935 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | |
| 1937 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1938 | * On the next backup, perform the feedback loop again. (I don't want to |
| 1939 | * keep sense information between backups, as some systems are |
| 1940 | * constantly on, and the system load can be totally different on the |
| 1941 | * next backup). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | */ |
| 1943 | tape->max_stages = tape->min_pipeline; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | if (tape->first_stage != NULL || |
| 1945 | tape->next_stage != NULL || |
| 1946 | tape->last_stage != NULL || |
| 1947 | tape->nr_stages != 0) { |
| 1948 | printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " |
| 1949 | "first_stage %p, next_stage %p, " |
| 1950 | "last_stage %p, nr_stages %d\n", |
| 1951 | tape->first_stage, tape->next_stage, |
| 1952 | tape->last_stage, tape->nr_stages); |
| 1953 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | } |
| 1955 | |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1956 | static int idetape_init_read(ide_drive_t *drive, int max_stages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | { |
| 1958 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | int bytes_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | |
| 1961 | /* Initialize read operation */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1962 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
| 1963 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | idetape_empty_write_pipeline(drive); |
| 1965 | idetape_flush_tape_buffers(drive); |
| 1966 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | if (tape->merge_stage || tape->merge_stage_size) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1968 | printk(KERN_ERR "ide-tape: merge_stage_size should be" |
| 1969 | " 0 now\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | tape->merge_stage_size = 0; |
| 1971 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1972 | tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0); |
| 1973 | if (!tape->merge_stage) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | return -ENOMEM; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1975 | tape->chrdev_dir = IDETAPE_DIR_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | |
| 1977 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1978 | * Issue a read 0 command to ensure that DSC handshake is |
| 1979 | * switched from completion mode to buffer available mode. |
| 1980 | * No point in issuing this if DSC overlap isn't supported, some |
| 1981 | * drives (Seagate STT3401A) will return an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | */ |
| 1983 | if (drive->dsc_overlap) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1984 | bytes_read = idetape_queue_rw_tail(drive, |
| 1985 | REQ_IDETAPE_READ, 0, |
| 1986 | tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | if (bytes_read < 0) { |
| 1988 | __idetape_kfree_stage(tape->merge_stage); |
| 1989 | tape->merge_stage = NULL; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1990 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | return bytes_read; |
| 1992 | } |
| 1993 | } |
| 1994 | } |
Borislav Petkov | 5e69bd9 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 1995 | |
Borislav Petkov | c4b22f8 | 2008-04-26 22:25:20 +0200 | [diff] [blame] | 1996 | if (!test_bit(IDETAPE_FLAG_PIPELINE_ACTIVE, &tape->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | if (tape->nr_pending_stages >= 3 * max_stages / 4) { |
| 1998 | tape->measure_insert_time = 1; |
| 1999 | tape->insert_time = jiffies; |
| 2000 | tape->insert_size = 0; |
| 2001 | tape->insert_speed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | } |
| 2003 | } |
| 2004 | return 0; |
| 2005 | } |
| 2006 | |
| 2007 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2008 | * Called from idetape_chrdev_read() to service a character device read request |
| 2009 | * and add read-ahead requests to our pipeline. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2011 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | { |
| 2013 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2015 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2017 | /* If we are at a filemark, return a read length of 0 */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2018 | if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | return 0; |
| 2020 | |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2021 | idetape_init_read(drive, tape->max_stages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | |
Borislav Petkov | 5e69bd9 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2023 | if (test_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | return 0; |
Borislav Petkov | 5e69bd9 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2025 | |
| 2026 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
| 2027 | tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | } |
| 2029 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2030 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | { |
| 2032 | idetape_tape_t *tape = drive->driver_data; |
| 2033 | struct idetape_bh *bh; |
| 2034 | int blocks; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2035 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | while (bcount) { |
| 2037 | unsigned int count; |
| 2038 | |
| 2039 | bh = tape->merge_stage->bh; |
| 2040 | count = min(tape->stage_size, bcount); |
| 2041 | bcount -= count; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2042 | blocks = count / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | while (count) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2044 | atomic_set(&bh->b_count, |
| 2045 | min(count, (unsigned int)bh->b_size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
| 2047 | count -= atomic_read(&bh->b_count); |
| 2048 | bh = bh->b_reqnext; |
| 2049 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2050 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
| 2051 | tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | } |
| 2053 | } |
| 2054 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2056 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
| 2057 | * currently support only one partition. |
| 2058 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2059 | static int idetape_rewind_tape(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | { |
| 2061 | int retval; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2062 | struct ide_atapi_pc pc; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2063 | idetape_tape_t *tape; |
| 2064 | tape = drive->driver_data; |
| 2065 | |
| 2066 | debug_log(DBG_SENSE, "Enter %s\n", __func__); |
| 2067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | idetape_create_rewind_cmd(drive, &pc); |
| 2069 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2070 | if (retval) |
| 2071 | return retval; |
| 2072 | |
| 2073 | idetape_create_read_position_cmd(&pc); |
| 2074 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2075 | if (retval) |
| 2076 | return retval; |
| 2077 | return 0; |
| 2078 | } |
| 2079 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2080 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2081 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
| 2082 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | { |
| 2084 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | void __user *argp = (void __user *)arg; |
| 2086 | |
Borislav Petkov | d59823f | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2087 | struct idetape_config { |
| 2088 | int dsc_rw_frequency; |
| 2089 | int dsc_media_access_frequency; |
| 2090 | int nr_stages; |
| 2091 | } config; |
| 2092 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2093 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 2094 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | switch (cmd) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2096 | case 0x0340: |
| 2097 | if (copy_from_user(&config, argp, sizeof(config))) |
| 2098 | return -EFAULT; |
| 2099 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; |
| 2100 | tape->max_stages = config.nr_stages; |
| 2101 | break; |
| 2102 | case 0x0350: |
| 2103 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
| 2104 | config.nr_stages = tape->max_stages; |
| 2105 | if (copy_to_user(argp, &config, sizeof(config))) |
| 2106 | return -EFAULT; |
| 2107 | break; |
| 2108 | default: |
| 2109 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | } |
| 2111 | return 0; |
| 2112 | } |
| 2113 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2114 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
| 2115 | int mt_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | { |
| 2117 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2118 | struct ide_atapi_pc pc; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2119 | int retval, count = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2120 | int sprev = !!(tape->caps[4] & 0x20); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
| 2122 | if (mt_count == 0) |
| 2123 | return 0; |
| 2124 | if (MTBSF == mt_op || MTBSFM == mt_op) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2125 | if (!sprev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | return -EIO; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2127 | mt_count = -mt_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | } |
| 2129 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2130 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | tape->merge_stage_size = 0; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2132 | if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | ++count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | idetape_discard_read_pipeline(drive, 0); |
| 2135 | } |
| 2136 | |
| 2137 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2138 | * The filemark was not found in our internal pipeline; now we can issue |
| 2139 | * the space command. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | */ |
| 2141 | switch (mt_op) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2142 | case MTFSF: |
| 2143 | case MTBSF: |
| 2144 | idetape_create_space_cmd(&pc, mt_count - count, |
| 2145 | IDETAPE_SPACE_OVER_FILEMARK); |
| 2146 | return idetape_queue_pc_tail(drive, &pc); |
| 2147 | case MTFSFM: |
| 2148 | case MTBSFM: |
| 2149 | if (!sprev) |
| 2150 | return -EIO; |
| 2151 | retval = idetape_space_over_filemarks(drive, MTFSF, |
| 2152 | mt_count - count); |
| 2153 | if (retval) |
| 2154 | return retval; |
| 2155 | count = (MTBSFM == mt_op ? 1 : -1); |
| 2156 | return idetape_space_over_filemarks(drive, MTFSF, count); |
| 2157 | default: |
| 2158 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
| 2159 | mt_op); |
| 2160 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | } |
| 2162 | } |
| 2163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2165 | * Our character device read / write functions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2167 | * The tape is optimized to maximize throughput when it is transferring an |
| 2168 | * integral number of the "continuous transfer limit", which is a parameter of |
| 2169 | * the specific tape (26kB on my particular tape, 32kB for Onstream). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2171 | * As of version 1.3 of the driver, the character device provides an abstract |
| 2172 | * continuous view of the media - any mix of block sizes (even 1 byte) on the |
| 2173 | * same backup/restore procedure is supported. The driver will internally |
| 2174 | * convert the requests to the recommended transfer unit, so that an unmatch |
| 2175 | * between the user's block size to the recommended size will only result in a |
| 2176 | * (slightly) increased driver overhead, but will no longer hit performance. |
| 2177 | * This is not applicable to Onstream. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2179 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
| 2180 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | { |
| 2182 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2183 | ide_drive_t *drive = tape->drive; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2184 | ssize_t bytes_read, temp, actually_read = 0, rc; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2185 | ssize_t ret = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2186 | u16 ctl = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2188 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2190 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2191 | if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2192 | if (count > tape->blk_size && |
| 2193 | (count % tape->blk_size) == 0) |
| 2194 | tape->user_bs_factor = count / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | } |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2196 | rc = idetape_init_read(drive, tape->max_stages); |
| 2197 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | return rc; |
| 2199 | if (count == 0) |
| 2200 | return (0); |
| 2201 | if (tape->merge_stage_size) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2202 | actually_read = min((unsigned int)(tape->merge_stage_size), |
| 2203 | (unsigned int)count); |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2204 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2205 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | buf += actually_read; |
| 2207 | tape->merge_stage_size -= actually_read; |
| 2208 | count -= actually_read; |
| 2209 | } |
| 2210 | while (count >= tape->stage_size) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2211 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | if (bytes_read <= 0) |
| 2213 | goto finish; |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2214 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2215 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | buf += bytes_read; |
| 2217 | count -= bytes_read; |
| 2218 | actually_read += bytes_read; |
| 2219 | } |
| 2220 | if (count) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2221 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | if (bytes_read <= 0) |
| 2223 | goto finish; |
| 2224 | temp = min((unsigned long)count, (unsigned long)bytes_read); |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2225 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2226 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | actually_read += temp; |
| 2228 | tape->merge_stage_size = bytes_read-temp; |
| 2229 | } |
| 2230 | finish: |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2231 | if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2232 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
| 2233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | idetape_space_over_filemarks(drive, MTFSF, 1); |
| 2235 | return 0; |
| 2236 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2237 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2238 | return ret ? ret : actually_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | } |
| 2240 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2241 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | size_t count, loff_t *ppos) |
| 2243 | { |
| 2244 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2245 | ide_drive_t *drive = tape->drive; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2246 | ssize_t actually_written = 0; |
| 2247 | ssize_t ret = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2248 | u16 ctl = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | |
| 2250 | /* The drive is write protected. */ |
| 2251 | if (tape->write_prot) |
| 2252 | return -EACCES; |
| 2253 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2254 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | |
| 2256 | /* Initialize write operation */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2257 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
| 2258 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | idetape_discard_read_pipeline(drive, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | if (tape->merge_stage || tape->merge_stage_size) { |
| 2261 | printk(KERN_ERR "ide-tape: merge_stage_size " |
| 2262 | "should be 0 now\n"); |
| 2263 | tape->merge_stage_size = 0; |
| 2264 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2265 | tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0); |
| 2266 | if (!tape->merge_stage) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | return -ENOMEM; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2268 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | idetape_init_merge_stage(tape); |
| 2270 | |
| 2271 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2272 | * Issue a write 0 command to ensure that DSC handshake is |
| 2273 | * switched from completion mode to buffer available mode. No |
| 2274 | * point in issuing this if DSC overlap isn't supported, some |
| 2275 | * drives (Seagate STT3401A) will return an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | */ |
| 2277 | if (drive->dsc_overlap) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2278 | ssize_t retval = idetape_queue_rw_tail(drive, |
| 2279 | REQ_IDETAPE_WRITE, 0, |
| 2280 | tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | if (retval < 0) { |
| 2282 | __idetape_kfree_stage(tape->merge_stage); |
| 2283 | tape->merge_stage = NULL; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2284 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | return retval; |
| 2286 | } |
| 2287 | } |
| 2288 | } |
| 2289 | if (count == 0) |
| 2290 | return (0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | if (tape->merge_stage_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | if (tape->merge_stage_size >= tape->stage_size) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2293 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | tape->merge_stage_size = 0; |
| 2295 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2296 | actually_written = min((unsigned int) |
| 2297 | (tape->stage_size - tape->merge_stage_size), |
| 2298 | (unsigned int)count); |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 2299 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2300 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | buf += actually_written; |
| 2302 | tape->merge_stage_size += actually_written; |
| 2303 | count -= actually_written; |
| 2304 | |
| 2305 | if (tape->merge_stage_size == tape->stage_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2306 | ssize_t retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | tape->merge_stage_size = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2308 | retval = idetape_add_chrdev_write_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | if (retval <= 0) |
| 2310 | return (retval); |
| 2311 | } |
| 2312 | } |
| 2313 | while (count >= tape->stage_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2314 | ssize_t retval; |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 2315 | if (idetape_copy_stage_from_user(tape, buf, tape->stage_size)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2316 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | buf += tape->stage_size; |
| 2318 | count -= tape->stage_size; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2319 | retval = idetape_add_chrdev_write_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | actually_written += tape->stage_size; |
| 2321 | if (retval <= 0) |
| 2322 | return (retval); |
| 2323 | } |
| 2324 | if (count) { |
| 2325 | actually_written += count; |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 2326 | if (idetape_copy_stage_from_user(tape, buf, count)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2327 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | tape->merge_stage_size += count; |
| 2329 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2330 | return ret ? ret : actually_written; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | } |
| 2332 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2333 | static int idetape_write_filemark(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2335 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | |
| 2337 | /* Write a filemark */ |
| 2338 | idetape_create_write_filemark_cmd(drive, &pc, 1); |
| 2339 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 2340 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
| 2341 | return -EIO; |
| 2342 | } |
| 2343 | return 0; |
| 2344 | } |
| 2345 | |
| 2346 | /* |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2347 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
| 2348 | * requested. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2350 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
| 2351 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also |
| 2352 | * usually not supported (it is supported in the rare case in which we crossed |
| 2353 | * the filemark during our read-ahead pipelined operation mode). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2355 | * The following commands are currently not supported: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2357 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
| 2358 | * MT_ST_WRITE_THRESHOLD. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | */ |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2360 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | { |
| 2362 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2363 | struct ide_atapi_pc pc; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2364 | int i, retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2366 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
| 2367 | mt_op, mt_count); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2368 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2369 | /* Commands which need our pipelined read-ahead stages. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | switch (mt_op) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2371 | case MTFSF: |
| 2372 | case MTFSFM: |
| 2373 | case MTBSF: |
| 2374 | case MTBSFM: |
| 2375 | if (!mt_count) |
| 2376 | return 0; |
| 2377 | return idetape_space_over_filemarks(drive, mt_op, mt_count); |
| 2378 | default: |
| 2379 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2380 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | switch (mt_op) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2383 | case MTWEOF: |
| 2384 | if (tape->write_prot) |
| 2385 | return -EACCES; |
| 2386 | idetape_discard_read_pipeline(drive, 1); |
| 2387 | for (i = 0; i < mt_count; i++) { |
| 2388 | retval = idetape_write_filemark(drive); |
| 2389 | if (retval) |
| 2390 | return retval; |
| 2391 | } |
| 2392 | return 0; |
| 2393 | case MTREW: |
| 2394 | idetape_discard_read_pipeline(drive, 0); |
| 2395 | if (idetape_rewind_tape(drive)) |
| 2396 | return -EIO; |
| 2397 | return 0; |
| 2398 | case MTLOAD: |
| 2399 | idetape_discard_read_pipeline(drive, 0); |
| 2400 | idetape_create_load_unload_cmd(drive, &pc, |
| 2401 | IDETAPE_LU_LOAD_MASK); |
| 2402 | return idetape_queue_pc_tail(drive, &pc); |
| 2403 | case MTUNLOAD: |
| 2404 | case MTOFFL: |
| 2405 | /* |
| 2406 | * If door is locked, attempt to unlock before |
| 2407 | * attempting to eject. |
| 2408 | */ |
| 2409 | if (tape->door_locked) { |
| 2410 | if (idetape_create_prevent_cmd(drive, &pc, 0)) |
| 2411 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 2412 | tape->door_locked = DOOR_UNLOCKED; |
| 2413 | } |
| 2414 | idetape_discard_read_pipeline(drive, 0); |
| 2415 | idetape_create_load_unload_cmd(drive, &pc, |
| 2416 | !IDETAPE_LU_LOAD_MASK); |
| 2417 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2418 | if (!retval) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2419 | clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2420 | return retval; |
| 2421 | case MTNOP: |
| 2422 | idetape_discard_read_pipeline(drive, 0); |
| 2423 | return idetape_flush_tape_buffers(drive); |
| 2424 | case MTRETEN: |
| 2425 | idetape_discard_read_pipeline(drive, 0); |
| 2426 | idetape_create_load_unload_cmd(drive, &pc, |
| 2427 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
| 2428 | return idetape_queue_pc_tail(drive, &pc); |
| 2429 | case MTEOM: |
| 2430 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); |
| 2431 | return idetape_queue_pc_tail(drive, &pc); |
| 2432 | case MTERASE: |
| 2433 | (void)idetape_rewind_tape(drive); |
| 2434 | idetape_create_erase_cmd(&pc); |
| 2435 | return idetape_queue_pc_tail(drive, &pc); |
| 2436 | case MTSETBLK: |
| 2437 | if (mt_count) { |
| 2438 | if (mt_count < tape->blk_size || |
| 2439 | mt_count % tape->blk_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | return -EIO; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2441 | tape->user_bs_factor = mt_count / tape->blk_size; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2442 | clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2443 | } else |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2444 | set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2445 | return 0; |
| 2446 | case MTSEEK: |
| 2447 | idetape_discard_read_pipeline(drive, 0); |
| 2448 | return idetape_position_tape(drive, |
| 2449 | mt_count * tape->user_bs_factor, tape->partition, 0); |
| 2450 | case MTSETPART: |
| 2451 | idetape_discard_read_pipeline(drive, 0); |
| 2452 | return idetape_position_tape(drive, 0, mt_count, 0); |
| 2453 | case MTFSR: |
| 2454 | case MTBSR: |
| 2455 | case MTLOCK: |
| 2456 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | return 0; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2458 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2459 | if (retval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | return retval; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2461 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
| 2462 | return 0; |
| 2463 | case MTUNLOCK: |
| 2464 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | return 0; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2466 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2467 | if (retval) |
| 2468 | return retval; |
| 2469 | tape->door_locked = DOOR_UNLOCKED; |
| 2470 | return 0; |
| 2471 | default: |
| 2472 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
| 2473 | mt_op); |
| 2474 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | } |
| 2476 | } |
| 2477 | |
| 2478 | /* |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2479 | * Our character device ioctls. General mtio.h magnetic io commands are |
| 2480 | * supported here, and not in the corresponding block interface. Our own |
| 2481 | * ide-tape ioctls are supported on both interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | */ |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2483 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
| 2484 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | { |
| 2486 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2487 | ide_drive_t *drive = tape->drive; |
| 2488 | struct mtop mtop; |
| 2489 | struct mtget mtget; |
| 2490 | struct mtpos mtpos; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2491 | int block_offset = 0, position = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | void __user *argp = (void __user *)arg; |
| 2493 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2494 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2495 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2496 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | idetape_empty_write_pipeline(drive); |
| 2498 | idetape_flush_tape_buffers(drive); |
| 2499 | } |
| 2500 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
Borislav Petkov | b361acb | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 2501 | block_offset = tape->merge_stage_size / |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2502 | (tape->blk_size * tape->user_bs_factor); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2503 | position = idetape_read_position(drive); |
| 2504 | if (position < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | return -EIO; |
| 2506 | } |
| 2507 | switch (cmd) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2508 | case MTIOCTOP: |
| 2509 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) |
| 2510 | return -EFAULT; |
| 2511 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); |
| 2512 | case MTIOCGET: |
| 2513 | memset(&mtget, 0, sizeof(struct mtget)); |
| 2514 | mtget.mt_type = MT_ISSCSI2; |
| 2515 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 2516 | mtget.mt_dsreg = |
| 2517 | ((tape->blk_size * tape->user_bs_factor) |
| 2518 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2519 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2520 | if (tape->drv_write_prot) |
| 2521 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); |
| 2522 | |
| 2523 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) |
| 2524 | return -EFAULT; |
| 2525 | return 0; |
| 2526 | case MTIOCPOS: |
| 2527 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 2528 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) |
| 2529 | return -EFAULT; |
| 2530 | return 0; |
| 2531 | default: |
| 2532 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
| 2533 | idetape_discard_read_pipeline(drive, 1); |
| 2534 | return idetape_blkdev_ioctl(drive, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | } |
| 2536 | } |
| 2537 | |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2538 | /* |
| 2539 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape |
| 2540 | * block size with the reported value. |
| 2541 | */ |
| 2542 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) |
| 2543 | { |
| 2544 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2545 | struct ide_atapi_pc pc; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2546 | |
| 2547 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); |
| 2548 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 2549 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2550 | if (tape->blk_size == 0) { |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2551 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
| 2552 | "block size, assuming 32k\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2553 | tape->blk_size = 32768; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2554 | } |
| 2555 | return; |
| 2556 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2557 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
| 2558 | (pc.buf[4 + 6] << 8) + |
| 2559 | pc.buf[4 + 7]; |
| 2560 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2563 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | { |
| 2565 | unsigned int minor = iminor(inode), i = minor & ~0xc0; |
| 2566 | ide_drive_t *drive; |
| 2567 | idetape_tape_t *tape; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2568 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | int retval; |
| 2570 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2571 | if (i >= MAX_HWIFS * MAX_DRIVES) |
| 2572 | return -ENXIO; |
| 2573 | |
| 2574 | tape = ide_tape_chrdev_get(i); |
| 2575 | if (!tape) |
| 2576 | return -ENXIO; |
| 2577 | |
| 2578 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
| 2579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2580 | /* |
| 2581 | * We really want to do nonseekable_open(inode, filp); here, but some |
| 2582 | * versions of tar incorrectly call lseek on tapes and bail out if that |
| 2583 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
| 2584 | */ |
| 2585 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
| 2586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | drive = tape->drive; |
| 2588 | |
| 2589 | filp->private_data = tape; |
| 2590 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2591 | if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | retval = -EBUSY; |
| 2593 | goto out_put_tape; |
| 2594 | } |
| 2595 | |
| 2596 | retval = idetape_wait_ready(drive, 60 * HZ); |
| 2597 | if (retval) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2598 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
| 2600 | goto out_put_tape; |
| 2601 | } |
| 2602 | |
| 2603 | idetape_read_position(drive); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2604 | if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | (void)idetape_rewind_tape(drive); |
| 2606 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2607 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2608 | clear_bit(IDETAPE_FLAG_PIPELINE_ERR, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2609 | |
| 2610 | /* Read block size and write protect status from drive. */ |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2611 | ide_tape_get_bsize_from_bdesc(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2612 | |
| 2613 | /* Set write protect flag if device is opened as read-only. */ |
| 2614 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) |
| 2615 | tape->write_prot = 1; |
| 2616 | else |
| 2617 | tape->write_prot = tape->drv_write_prot; |
| 2618 | |
| 2619 | /* Make sure drive isn't write protected if user wants to write. */ |
| 2620 | if (tape->write_prot) { |
| 2621 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || |
| 2622 | (filp->f_flags & O_ACCMODE) == O_RDWR) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2623 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | retval = -EROFS; |
| 2625 | goto out_put_tape; |
| 2626 | } |
| 2627 | } |
| 2628 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2629 | /* Lock the tape drive door so user can't eject. */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2630 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2631 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
| 2632 | if (!idetape_queue_pc_tail(drive, &pc)) { |
| 2633 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
| 2634 | tape->door_locked = DOOR_LOCKED; |
| 2635 | } |
| 2636 | } |
| 2637 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2638 | return 0; |
| 2639 | |
| 2640 | out_put_tape: |
| 2641 | ide_tape_put(tape); |
| 2642 | return retval; |
| 2643 | } |
| 2644 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2645 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2646 | { |
| 2647 | idetape_tape_t *tape = drive->driver_data; |
| 2648 | |
| 2649 | idetape_empty_write_pipeline(drive); |
| 2650 | tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); |
| 2651 | if (tape->merge_stage != NULL) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2652 | idetape_pad_zeros(drive, tape->blk_size * |
| 2653 | (tape->user_bs_factor - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | __idetape_kfree_stage(tape->merge_stage); |
| 2655 | tape->merge_stage = NULL; |
| 2656 | } |
| 2657 | idetape_write_filemark(drive); |
| 2658 | idetape_flush_tape_buffers(drive); |
| 2659 | idetape_flush_tape_buffers(drive); |
| 2660 | } |
| 2661 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2662 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | { |
| 2664 | struct ide_tape_obj *tape = ide_tape_f(filp); |
| 2665 | ide_drive_t *drive = tape->drive; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2666 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | unsigned int minor = iminor(inode); |
| 2668 | |
| 2669 | lock_kernel(); |
| 2670 | tape = drive->driver_data; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2671 | |
| 2672 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2674 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | idetape_write_release(drive, minor); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2676 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | if (minor < 128) |
| 2678 | idetape_discard_read_pipeline(drive, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | } |
Borislav Petkov | f64eee7 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2680 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2681 | if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2682 | (void) idetape_rewind_tape(drive); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2683 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | if (tape->door_locked == DOOR_LOCKED) { |
| 2685 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { |
| 2686 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 2687 | tape->door_locked = DOOR_UNLOCKED; |
| 2688 | } |
| 2689 | } |
| 2690 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2691 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2692 | ide_tape_put(tape); |
| 2693 | unlock_kernel(); |
| 2694 | return 0; |
| 2695 | } |
| 2696 | |
| 2697 | /* |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2698 | * check the contents of the ATAPI IDENTIFY command results. We return: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2699 | * |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2700 | * 1 - If the tape can be supported by us, based on the information we have so |
| 2701 | * far. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | * |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2703 | * 0 - If this tape driver is not currently supported by us. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | */ |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2705 | static int idetape_identify_device(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | { |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2707 | u8 gcw[2], protocol, device_type, removable, packet_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2708 | |
| 2709 | if (drive->id_read == 0) |
| 2710 | return 1; |
| 2711 | |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2712 | *((unsigned short *) &gcw) = drive->id->config; |
| 2713 | |
| 2714 | protocol = (gcw[1] & 0xC0) >> 6; |
| 2715 | device_type = gcw[1] & 0x1F; |
| 2716 | removable = !!(gcw[0] & 0x80); |
| 2717 | packet_size = gcw[0] & 0x3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2718 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2719 | /* Check that we can support this device */ |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2720 | if (protocol != 2) |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2721 | printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2722 | protocol); |
| 2723 | else if (device_type != 1) |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2724 | printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2725 | "to tape\n", device_type); |
| 2726 | else if (!removable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2728 | else if (packet_size != 0) { |
Borislav Petkov | 24d57f8 | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2729 | printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" |
| 2730 | " bytes\n", packet_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2731 | } else |
| 2732 | return 1; |
| 2733 | return 0; |
| 2734 | } |
| 2735 | |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2736 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2738 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2739 | struct ide_atapi_pc pc; |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2740 | char fw_rev[6], vendor_id[10], product_id[18]; |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2742 | idetape_create_inquiry_cmd(&pc); |
| 2743 | if (idetape_queue_pc_tail(drive, &pc)) { |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2744 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
| 2745 | tape->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | return; |
| 2747 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2748 | memcpy(vendor_id, &pc.buf[8], 8); |
| 2749 | memcpy(product_id, &pc.buf[16], 16); |
| 2750 | memcpy(fw_rev, &pc.buf[32], 4); |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2751 | |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2752 | ide_fixstring(vendor_id, 10, 0); |
| 2753 | ide_fixstring(product_id, 18, 0); |
| 2754 | ide_fixstring(fw_rev, 6, 0); |
| 2755 | |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2756 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2757 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | } |
| 2759 | |
| 2760 | /* |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2761 | * Ask the tape about its various parameters. In particular, we will adjust our |
| 2762 | * data transfer buffer size to the recommended value as returned by the tape. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2764 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | { |
| 2766 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2767 | struct ide_atapi_pc pc; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2768 | u8 *caps; |
| 2769 | u8 speed, max_speed; |
Borislav Petkov | 47314fa | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2770 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
| 2772 | if (idetape_queue_pc_tail(drive, &pc)) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2773 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
| 2774 | " some default values\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2775 | tape->blk_size = 512; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2776 | put_unaligned(52, (u16 *)&tape->caps[12]); |
| 2777 | put_unaligned(540, (u16 *)&tape->caps[14]); |
| 2778 | put_unaligned(6*52, (u16 *)&tape->caps[16]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2779 | return; |
| 2780 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2781 | caps = pc.buf + 4 + pc.buf[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2783 | /* convert to host order and save for later use */ |
| 2784 | speed = be16_to_cpu(*(u16 *)&caps[14]); |
| 2785 | max_speed = be16_to_cpu(*(u16 *)&caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2787 | put_unaligned(max_speed, (u16 *)&caps[8]); |
| 2788 | put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); |
| 2789 | put_unaligned(speed, (u16 *)&caps[14]); |
| 2790 | put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); |
| 2791 | |
| 2792 | if (!speed) { |
| 2793 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " |
| 2794 | "(assuming 650KB/sec)\n", drive->name); |
| 2795 | put_unaligned(650, (u16 *)&caps[14]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | } |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2797 | if (!max_speed) { |
| 2798 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " |
| 2799 | "(assuming 650KB/sec)\n", drive->name); |
| 2800 | put_unaligned(650, (u16 *)&caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | } |
| 2802 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2803 | memcpy(&tape->caps, caps, 20); |
| 2804 | if (caps[7] & 0x02) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2805 | tape->blk_size = 512; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2806 | else if (caps[7] & 0x04) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2807 | tape->blk_size = 1024; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2808 | } |
| 2809 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2810 | #ifdef CONFIG_IDE_PROC_FS |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2811 | static void idetape_add_settings(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2812 | { |
| 2813 | idetape_tape_t *tape = drive->driver_data; |
| 2814 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2815 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 2816 | 1, 2, (u16 *)&tape->caps[16], NULL); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2817 | ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, |
| 2818 | tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); |
| 2819 | ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, |
| 2820 | tape->stage_size / 1024, 1, &tape->max_stages, NULL); |
| 2821 | ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, |
| 2822 | tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); |
| 2823 | ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, |
| 2824 | 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, |
| 2825 | NULL); |
| 2826 | ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, |
| 2827 | 0xffff, tape->stage_size / 1024, 1, |
| 2828 | &tape->nr_pending_stages, NULL); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2829 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 2830 | 1, 1, (u16 *)&tape->caps[14], NULL); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2831 | ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, |
| 2832 | 1024, &tape->stage_size, NULL); |
| 2833 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
| 2834 | IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, |
| 2835 | NULL); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2836 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, |
| 2837 | 1, &drive->dsc_overlap, NULL); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2838 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, |
| 2839 | 1, 1, &tape->avg_speed, NULL); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2840 | ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
| 2841 | 1, &tape->debug_mask, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2842 | } |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2843 | #else |
| 2844 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } |
| 2845 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2846 | |
| 2847 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2848 | * The function below is called to: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2849 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2850 | * 1. Initialize our various state variables. |
| 2851 | * 2. Ask the tape for its capabilities. |
| 2852 | * 3. Allocate a buffer which will be used for data transfer. The buffer size |
| 2853 | * is chosen based on the recommendation which we received in step 2. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2855 | * Note that at this point ide.c already assigned us an irq, so that we can |
| 2856 | * queue requests here and wait for their completion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2858 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2859 | { |
| 2860 | unsigned long t1, tmid, tn, t; |
| 2861 | int speed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2862 | int stage_size; |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2863 | u8 gcw[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | struct sysinfo si; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2865 | u16 *ctl = (u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2867 | spin_lock_init(&tape->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | drive->dsc_overlap = 1; |
Bartlomiej Zolnierkiewicz | 4166c19 | 2008-02-01 23:09:30 +0100 | [diff] [blame] | 2869 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
| 2870 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", |
| 2871 | tape->name); |
| 2872 | drive->dsc_overlap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2874 | /* Seagate Travan drives do not support DSC overlap. */ |
| 2875 | if (strstr(drive->id->model, "Seagate STT3401")) |
| 2876 | drive->dsc_overlap = 0; |
| 2877 | tape->minor = minor; |
| 2878 | tape->name[0] = 'h'; |
| 2879 | tape->name[1] = 't'; |
| 2880 | tape->name[2] = '0' + minor; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2881 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | tape->pc = tape->pc_stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2883 | *((unsigned short *) &gcw) = drive->id->config; |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2884 | |
| 2885 | /* Command packet DRQ type */ |
| 2886 | if (((gcw[0] & 0x60) >> 5) == 1) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2887 | set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2888 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2889 | tape->min_pipeline = 10; |
| 2890 | tape->max_pipeline = 10; |
| 2891 | tape->max_stages = 10; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2893 | idetape_get_inquiry_results(drive); |
| 2894 | idetape_get_mode_sense_results(drive); |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2895 | ide_tape_get_bsize_from_bdesc(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2896 | tape->user_bs_factor = 1; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2897 | tape->stage_size = *ctl * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | while (tape->stage_size > 0xffff) { |
| 2899 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2900 | *ctl /= 2; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2901 | tape->stage_size = *ctl * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2902 | } |
| 2903 | stage_size = tape->stage_size; |
| 2904 | tape->pages_per_stage = stage_size / PAGE_SIZE; |
| 2905 | if (stage_size % PAGE_SIZE) { |
| 2906 | tape->pages_per_stage++; |
| 2907 | tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; |
| 2908 | } |
| 2909 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2910 | /* Select the "best" DSC read/write polling freq and pipeline size. */ |
| 2911 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2912 | |
| 2913 | tape->max_stages = speed * 1000 * 10 / tape->stage_size; |
| 2914 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2915 | /* Limit memory use for pipeline to 10% of physical memory */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | si_meminfo(&si); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2917 | if (tape->max_stages * tape->stage_size > |
| 2918 | si.totalram * si.mem_unit / 10) |
| 2919 | tape->max_stages = |
| 2920 | si.totalram * si.mem_unit / (10 * tape->stage_size); |
| 2921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2922 | tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); |
| 2923 | tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2924 | tape->max_pipeline = |
| 2925 | min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); |
| 2926 | if (tape->max_stages == 0) { |
| 2927 | tape->max_stages = 1; |
| 2928 | tape->min_pipeline = 1; |
| 2929 | tape->max_pipeline = 1; |
| 2930 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2931 | |
| 2932 | t1 = (tape->stage_size * HZ) / (speed * 1000); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2933 | tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); |
| 2935 | |
| 2936 | if (tape->max_stages) |
| 2937 | t = tn; |
| 2938 | else |
| 2939 | t = t1; |
| 2940 | |
| 2941 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2942 | * Ensure that the number we got makes sense; limit it within |
| 2943 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2945 | tape->best_dsc_rw_freq = max_t(unsigned long, |
| 2946 | min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), |
| 2947 | IDETAPE_DSC_RW_MIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2948 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
| 2949 | "%dkB pipeline, %lums tDSC%s\n", |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2950 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
| 2951 | (*(u16 *)&tape->caps[16] * 512) / tape->stage_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2952 | tape->stage_size / 1024, |
| 2953 | tape->max_stages * tape->stage_size / 1024, |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2954 | tape->best_dsc_rw_freq * 1000 / HZ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2955 | drive->using_dma ? ", DMA":""); |
| 2956 | |
| 2957 | idetape_add_settings(drive); |
| 2958 | } |
| 2959 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 2960 | static void ide_tape_remove(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2961 | { |
| 2962 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2963 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2964 | ide_proc_unregister_driver(drive, tape->driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | |
| 2966 | ide_unregister_region(tape->disk); |
| 2967 | |
| 2968 | ide_tape_put(tape); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2969 | } |
| 2970 | |
| 2971 | static void ide_tape_release(struct kref *kref) |
| 2972 | { |
| 2973 | struct ide_tape_obj *tape = to_ide_tape(kref); |
| 2974 | ide_drive_t *drive = tape->drive; |
| 2975 | struct gendisk *g = tape->disk; |
| 2976 | |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2977 | BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); |
| 2978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | drive->dsc_overlap = 0; |
| 2980 | drive->driver_data = NULL; |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 2981 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2982 | device_destroy(idetape_sysfs_class, |
| 2983 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | idetape_devs[tape->minor] = NULL; |
| 2985 | g->private_data = NULL; |
| 2986 | put_disk(g); |
| 2987 | kfree(tape); |
| 2988 | } |
| 2989 | |
Bartlomiej Zolnierkiewicz | ecfd80e | 2007-05-10 00:01:09 +0200 | [diff] [blame] | 2990 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2991 | static int proc_idetape_read_name |
| 2992 | (char *page, char **start, off_t off, int count, int *eof, void *data) |
| 2993 | { |
| 2994 | ide_drive_t *drive = (ide_drive_t *) data; |
| 2995 | idetape_tape_t *tape = drive->driver_data; |
| 2996 | char *out = page; |
| 2997 | int len; |
| 2998 | |
| 2999 | len = sprintf(out, "%s\n", tape->name); |
| 3000 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); |
| 3001 | } |
| 3002 | |
| 3003 | static ide_proc_entry_t idetape_proc[] = { |
| 3004 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, |
| 3005 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, |
| 3006 | { NULL, 0, NULL, NULL } |
| 3007 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | #endif |
| 3009 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3010 | static int ide_tape_probe(ide_drive_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3012 | static ide_driver_t idetape_driver = { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3013 | .gen_driver = { |
Laurent Riffard | 4ef3b8f | 2005-11-18 22:15:40 +0100 | [diff] [blame] | 3014 | .owner = THIS_MODULE, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3015 | .name = "ide-tape", |
| 3016 | .bus = &ide_bus_type, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3017 | }, |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3018 | .probe = ide_tape_probe, |
| 3019 | .remove = ide_tape_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3020 | .version = IDETAPE_VERSION, |
| 3021 | .media = ide_tape, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3022 | .supports_dsc_overlap = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3023 | .do_request = idetape_do_request, |
| 3024 | .end_request = idetape_end_request, |
| 3025 | .error = __ide_error, |
| 3026 | .abort = __ide_abort, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3027 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | .proc = idetape_proc, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3029 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3030 | }; |
| 3031 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 3032 | /* Our character device supporting functions, passed to register_chrdev. */ |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 3033 | static const struct file_operations idetape_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3034 | .owner = THIS_MODULE, |
| 3035 | .read = idetape_chrdev_read, |
| 3036 | .write = idetape_chrdev_write, |
| 3037 | .ioctl = idetape_chrdev_ioctl, |
| 3038 | .open = idetape_chrdev_open, |
| 3039 | .release = idetape_chrdev_release, |
| 3040 | }; |
| 3041 | |
| 3042 | static int idetape_open(struct inode *inode, struct file *filp) |
| 3043 | { |
| 3044 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 3045 | struct ide_tape_obj *tape; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3047 | tape = ide_tape_get(disk); |
| 3048 | if (!tape) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3049 | return -ENXIO; |
| 3050 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3051 | return 0; |
| 3052 | } |
| 3053 | |
| 3054 | static int idetape_release(struct inode *inode, struct file *filp) |
| 3055 | { |
| 3056 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 3057 | struct ide_tape_obj *tape = ide_tape_g(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3058 | |
| 3059 | ide_tape_put(tape); |
| 3060 | |
| 3061 | return 0; |
| 3062 | } |
| 3063 | |
| 3064 | static int idetape_ioctl(struct inode *inode, struct file *file, |
| 3065 | unsigned int cmd, unsigned long arg) |
| 3066 | { |
| 3067 | struct block_device *bdev = inode->i_bdev; |
| 3068 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); |
| 3069 | ide_drive_t *drive = tape->drive; |
| 3070 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); |
| 3071 | if (err == -EINVAL) |
| 3072 | err = idetape_blkdev_ioctl(drive, cmd, arg); |
| 3073 | return err; |
| 3074 | } |
| 3075 | |
| 3076 | static struct block_device_operations idetape_block_ops = { |
| 3077 | .owner = THIS_MODULE, |
| 3078 | .open = idetape_open, |
| 3079 | .release = idetape_release, |
| 3080 | .ioctl = idetape_ioctl, |
| 3081 | }; |
| 3082 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3083 | static int ide_tape_probe(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3084 | { |
| 3085 | idetape_tape_t *tape; |
| 3086 | struct gendisk *g; |
| 3087 | int minor; |
| 3088 | |
| 3089 | if (!strstr("ide-tape", drive->driver_req)) |
| 3090 | goto failed; |
| 3091 | if (!drive->present) |
| 3092 | goto failed; |
| 3093 | if (drive->media != ide_tape) |
| 3094 | goto failed; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3095 | if (!idetape_identify_device(drive)) { |
| 3096 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
| 3097 | " the driver\n", drive->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3098 | goto failed; |
| 3099 | } |
| 3100 | if (drive->scsi) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3101 | printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi" |
| 3102 | " emulation.\n", drive->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3103 | goto failed; |
| 3104 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3105 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3106 | if (tape == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3107 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
| 3108 | drive->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3109 | goto failed; |
| 3110 | } |
| 3111 | |
| 3112 | g = alloc_disk(1 << PARTN_BITS); |
| 3113 | if (!g) |
| 3114 | goto out_free_tape; |
| 3115 | |
| 3116 | ide_init_disk(g, drive); |
| 3117 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3118 | ide_proc_register_driver(drive, &idetape_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3120 | kref_init(&tape->kref); |
| 3121 | |
| 3122 | tape->drive = drive; |
| 3123 | tape->driver = &idetape_driver; |
| 3124 | tape->disk = g; |
| 3125 | |
| 3126 | g->private_data = &tape->driver; |
| 3127 | |
| 3128 | drive->driver_data = tape; |
| 3129 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 3130 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3131 | for (minor = 0; idetape_devs[minor]; minor++) |
| 3132 | ; |
| 3133 | idetape_devs[minor] = tape; |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 3134 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3135 | |
| 3136 | idetape_setup(drive, tape, minor); |
| 3137 | |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 3138 | device_create(idetape_sysfs_class, &drive->gendev, |
| 3139 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); |
| 3140 | device_create(idetape_sysfs_class, &drive->gendev, |
| 3141 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3143 | g->fops = &idetape_block_ops; |
| 3144 | ide_register_region(g); |
| 3145 | |
| 3146 | return 0; |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3148 | out_free_tape: |
| 3149 | kfree(tape); |
| 3150 | failed: |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3151 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3152 | } |
| 3153 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3154 | static void __exit idetape_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3155 | { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3156 | driver_unregister(&idetape_driver.gen_driver); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3157 | class_destroy(idetape_sysfs_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3158 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
| 3159 | } |
| 3160 | |
Bartlomiej Zolnierkiewicz | 17514e8 | 2005-11-19 22:24:35 +0100 | [diff] [blame] | 3161 | static int __init idetape_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3162 | { |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3163 | int error = 1; |
| 3164 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); |
| 3165 | if (IS_ERR(idetape_sysfs_class)) { |
| 3166 | idetape_sysfs_class = NULL; |
| 3167 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); |
| 3168 | error = -EBUSY; |
| 3169 | goto out; |
| 3170 | } |
| 3171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3172 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3173 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
| 3174 | " interface\n"); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3175 | error = -EBUSY; |
| 3176 | goto out_free_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | } |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3178 | |
| 3179 | error = driver_register(&idetape_driver.gen_driver); |
| 3180 | if (error) |
| 3181 | goto out_free_driver; |
| 3182 | |
| 3183 | return 0; |
| 3184 | |
| 3185 | out_free_driver: |
| 3186 | driver_unregister(&idetape_driver.gen_driver); |
| 3187 | out_free_class: |
| 3188 | class_destroy(idetape_sysfs_class); |
| 3189 | out: |
| 3190 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3191 | } |
| 3192 | |
Kay Sievers | 263756e | 2005-12-12 18:03:44 +0100 | [diff] [blame] | 3193 | MODULE_ALIAS("ide:*m-tape*"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3194 | module_init(idetape_init); |
| 3195 | module_exit(idetape_exit); |
| 3196 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |
Borislav Petkov | 9c14576 | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 3197 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
| 3198 | MODULE_LICENSE("GPL"); |