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 *****************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 76 | * After each failed packet command we issue a request sense command and retry |
| 77 | * the packet command IDETAPE_MAX_PC_RETRIES times. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | */ |
| 81 | #define IDETAPE_MAX_PC_RETRIES 3 |
| 82 | |
| 83 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 84 | * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE |
| 85 | * 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] | 86 | */ |
| 87 | #define IDETAPE_PC_BUFFER_SIZE 256 |
| 88 | |
| 89 | /* |
| 90 | * In various places in the driver, we need to allocate storage |
| 91 | * for packet commands and requests, which will remain valid while |
| 92 | * we leave the driver to wait for an interrupt or a timeout event. |
| 93 | */ |
| 94 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) |
| 95 | |
| 96 | /* |
| 97 | * Some drives (for example, Seagate STT3401A Travan) require a very long |
| 98 | * timeout, because they don't return an interrupt or clear their busy bit |
| 99 | * until after the command completes (even retension commands). |
| 100 | */ |
| 101 | #define IDETAPE_WAIT_CMD (900*HZ) |
| 102 | |
| 103 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 104 | * The following parameter is used to select the point in the internal tape fifo |
| 105 | * in which we will start to refill the buffer. Decreasing the following |
| 106 | * parameter will improve the system's latency and interactive response, while |
| 107 | * using a high value might improve system throughput. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | */ |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 109 | #define IDETAPE_FIFO_THRESHOLD 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 112 | * DSC polling parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 114 | * Polling for DSC (a single bit in the status register) is a very important |
| 115 | * 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] | 116 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 117 | * 1. Before a read/write packet command, to ensure that we can transfer data |
| 118 | * from/to the tape's data buffers, without causing an actual media access. |
| 119 | * In case the tape is not ready yet, we take out our request from the device |
| 120 | * request queue, so that ide.c could service requests from the other device |
| 121 | * on the same interface in the meantime. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 123 | * 2. After the successful initialization of a "media access packet command", |
| 124 | * which is a command that can take a long time to complete (the interval can |
| 125 | * range from several seconds to even an hour). Again, we postpone our request |
| 126 | * in the middle to free the bus for the other device. The polling frequency |
| 127 | * here should be lower than the read/write frequency since those media access |
| 128 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST |
| 129 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD |
| 130 | * (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] | 131 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 132 | * We also set a timeout for the timer, in case something goes wrong. The |
| 133 | * 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] | 134 | */ |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 135 | |
| 136 | /* DSC timings. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
| 138 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
| 139 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
| 140 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
| 141 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
| 142 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
| 143 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
| 144 | |
| 145 | /*************************** End of tunable parameters ***********************/ |
| 146 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 147 | /* tape directions */ |
| 148 | enum { |
| 149 | IDETAPE_DIR_NONE = (1 << 0), |
| 150 | IDETAPE_DIR_READ = (1 << 1), |
| 151 | IDETAPE_DIR_WRITE = (1 << 2), |
| 152 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | struct idetape_bh { |
Stephen Rothwell | ab05796 | 2007-08-01 23:46:44 +0200 | [diff] [blame] | 155 | u32 b_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | atomic_t b_count; |
| 157 | struct idetape_bh *b_reqnext; |
| 158 | char *b_data; |
| 159 | }; |
| 160 | |
Borislav Petkov | 03056b9 | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 161 | /* Tape door status */ |
| 162 | #define DOOR_UNLOCKED 0 |
| 163 | #define DOOR_LOCKED 1 |
| 164 | #define DOOR_EXPLICITLY_LOCKED 2 |
| 165 | |
| 166 | /* Some defines for the SPACE command */ |
| 167 | #define IDETAPE_SPACE_OVER_FILEMARK 1 |
| 168 | #define IDETAPE_SPACE_TO_EOD 3 |
| 169 | |
| 170 | /* Some defines for the LOAD UNLOAD command */ |
| 171 | #define IDETAPE_LU_LOAD_MASK 1 |
| 172 | #define IDETAPE_LU_RETENSION_MASK 2 |
| 173 | #define IDETAPE_LU_EOT_MASK 4 |
| 174 | |
| 175 | /* |
| 176 | * Special requests for our block device strategy routine. |
| 177 | * |
| 178 | * In order to service a character device command, we add special requests to |
| 179 | * the tail of our block device request queue and wait for their completion. |
| 180 | */ |
| 181 | |
| 182 | enum { |
| 183 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ |
| 184 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ |
| 185 | REQ_IDETAPE_READ = (1 << 2), |
| 186 | REQ_IDETAPE_WRITE = (1 << 3), |
| 187 | }; |
| 188 | |
| 189 | /* Error codes returned in rq->errors to the higher part of the driver. */ |
| 190 | #define IDETAPE_ERROR_GENERAL 101 |
| 191 | #define IDETAPE_ERROR_FILEMARK 102 |
| 192 | #define IDETAPE_ERROR_EOD 103 |
| 193 | |
| 194 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
| 195 | #define IDETAPE_BLOCK_DESCRIPTOR 0 |
| 196 | #define IDETAPE_CAPABILITIES_PAGE 0x2a |
| 197 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 198 | /* Tape flag bits values. */ |
| 199 | enum { |
| 200 | IDETAPE_FLAG_IGNORE_DSC = (1 << 0), |
| 201 | /* 0 When the tape position is unknown */ |
| 202 | IDETAPE_FLAG_ADDRESS_VALID = (1 << 1), |
| 203 | /* Device already opened */ |
Borislav Petkov | 42d5468 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 204 | IDETAPE_FLAG_BUSY = (1 << 2), |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 205 | /* Attempt to auto-detect the current user block size */ |
Borislav Petkov | 42d5468 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 206 | IDETAPE_FLAG_DETECT_BS = (1 << 3), |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 207 | /* Currently on a filemark */ |
Borislav Petkov | 42d5468 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 208 | IDETAPE_FLAG_FILEMARK = (1 << 4), |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 209 | /* DRQ interrupt device */ |
Borislav Petkov | 42d5468 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 210 | IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5), |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 211 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
Borislav Petkov | 42d5468 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 212 | IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6), |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 213 | }; |
| 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 216 | * Most of our global data which we need to save even as we leave the driver due |
| 217 | * 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] | 218 | */ |
| 219 | typedef struct ide_tape_obj { |
| 220 | ide_drive_t *drive; |
| 221 | ide_driver_t *driver; |
| 222 | struct gendisk *disk; |
| 223 | struct kref kref; |
| 224 | |
| 225 | /* |
| 226 | * Since a typical character device operation requires more |
| 227 | * than one packet command, we provide here enough memory |
| 228 | * for the maximum of interconnected packet commands. |
| 229 | * The packet commands are stored in the circular array pc_stack. |
| 230 | * pc_stack_index points to the last used entry, and warps around |
| 231 | * to the start when we get to the last array entry. |
| 232 | * |
| 233 | * pc points to the current processed packet command. |
| 234 | * |
| 235 | * failed_pc points to the last failed packet command, or contains |
| 236 | * NULL if we do not need to retry any packet command. This is |
| 237 | * required since an additional packet command is needed before the |
| 238 | * retry, to get detailed information on what went wrong. |
| 239 | */ |
| 240 | /* Current packet command */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 241 | struct ide_atapi_pc *pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | /* Last failed packet command */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 243 | struct ide_atapi_pc *failed_pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | /* Packet command stack */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 245 | struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | /* Next free packet command storage space */ |
| 247 | int pc_stack_index; |
| 248 | struct request rq_stack[IDETAPE_PC_STACK]; |
| 249 | /* We implement a circular array */ |
| 250 | int rq_stack_index; |
| 251 | |
| 252 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 253 | * DSC polling variables. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 255 | * While polling for DSC we use postponed_rq to postpone the current |
| 256 | * request so that ide.c will be able to service pending requests on the |
| 257 | * other device. Note that at most we will have only one DSC (usually |
Borislav Petkov | 5bd50dc | 2008-04-27 15:38:28 +0200 | [diff] [blame] | 258 | * data transfer) request in the device request queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | */ |
| 260 | struct request *postponed_rq; |
| 261 | /* The time in which we started polling for DSC */ |
| 262 | unsigned long dsc_polling_start; |
| 263 | /* Timer used to poll for dsc */ |
| 264 | struct timer_list dsc_timer; |
| 265 | /* Read/Write dsc polling frequency */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 266 | unsigned long best_dsc_rw_freq; |
| 267 | unsigned long dsc_poll_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | unsigned long dsc_timeout; |
| 269 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 270 | /* Read position information */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | u8 partition; |
| 272 | /* Current block */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 273 | unsigned int first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 275 | /* Last error information */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | u8 sense_key, asc, ascq; |
| 277 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 278 | /* Character device operation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | unsigned int minor; |
| 280 | /* device name */ |
| 281 | char name[4]; |
| 282 | /* Current character device data transfer direction */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 283 | u8 chrdev_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 285 | /* tape block size, usually 512 or 1024 bytes */ |
| 286 | unsigned short blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | int user_bs_factor; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | /* Copy of the tape's Capabilities and Mechanical Page */ |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 290 | u8 caps[20]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 293 | * Active data transfer request parameters. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 295 | * At most, there is only one ide-tape originated data transfer request |
| 296 | * in the device request queue. This allows ide.c to easily service |
| 297 | * requests from the other device when we postpone our active request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | */ |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 299 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 300 | /* Data buffer size chosen based on the tape's recommendation */ |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 301 | int buffer_size; |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 302 | /* merge buffer */ |
| 303 | struct idetape_bh *merge_bh; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 304 | /* size of the merge buffer */ |
| 305 | int merge_bh_size; |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 306 | /* pointer to current buffer head within the merge buffer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | struct idetape_bh *bh; |
| 308 | char *b_data; |
| 309 | int b_count; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 310 | |
Borislav Petkov | a997a43 | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 311 | int pages_per_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* Wasted space in each stage */ |
| 313 | int excess_bh_size; |
| 314 | |
| 315 | /* Status/Action flags: long for set_bit */ |
| 316 | unsigned long flags; |
| 317 | /* protects the ide-tape queue */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 318 | spinlock_t lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 320 | /* Measures average tape speed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | unsigned long avg_time; |
| 322 | int avg_size; |
| 323 | int avg_speed; |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | /* the door is currently locked */ |
| 326 | int door_locked; |
| 327 | /* the tape hardware is write protected */ |
| 328 | char drv_write_prot; |
| 329 | /* the tape is write protected (hardware or opened as read-only) */ |
| 330 | char write_prot; |
| 331 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 332 | u32 debug_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } idetape_tape_t; |
| 334 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 335 | static DEFINE_MUTEX(idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 337 | static struct class *idetape_sysfs_class; |
| 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
| 340 | |
| 341 | #define ide_tape_g(disk) \ |
| 342 | container_of((disk)->private_data, struct ide_tape_obj, driver) |
| 343 | |
| 344 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
| 345 | { |
| 346 | struct ide_tape_obj *tape = NULL; |
| 347 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 348 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | tape = ide_tape_g(disk); |
| 350 | if (tape) |
| 351 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 352 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | return tape; |
| 354 | } |
| 355 | |
| 356 | static void ide_tape_release(struct kref *); |
| 357 | |
| 358 | static void ide_tape_put(struct ide_tape_obj *tape) |
| 359 | { |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 360 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | kref_put(&tape->kref, ide_tape_release); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 362 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 366 | * The variables below are used for the character device interface. Additional |
| 367 | * state variables are defined in our ide_drive_t structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 369 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | #define ide_tape_f(file) ((file)->private_data) |
| 372 | |
| 373 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
| 374 | { |
| 375 | struct ide_tape_obj *tape = NULL; |
| 376 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 377 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | tape = idetape_devs[i]; |
| 379 | if (tape) |
| 380 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 381 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return tape; |
| 383 | } |
| 384 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 385 | 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] | 386 | unsigned int bcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
| 388 | struct idetape_bh *bh = pc->bh; |
| 389 | int count; |
| 390 | |
| 391 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (bh == NULL) { |
| 393 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 394 | "idetape_input_buffers\n"); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 395 | ide_pad_transfer(drive, 0, bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | return; |
| 397 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 398 | count = min( |
| 399 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), |
| 400 | bcount); |
Bartlomiej Zolnierkiewicz | 9567b34 | 2008-04-28 23:44:36 +0200 | [diff] [blame] | 401 | drive->hwif->input_data(drive, NULL, bh->b_data + |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 402 | atomic_read(&bh->b_count), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | bcount -= count; |
| 404 | atomic_add(count, &bh->b_count); |
| 405 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 406 | bh = bh->b_reqnext; |
| 407 | if (bh) |
| 408 | atomic_set(&bh->b_count, 0); |
| 409 | } |
| 410 | } |
| 411 | pc->bh = bh; |
| 412 | } |
| 413 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 414 | 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] | 415 | unsigned int bcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
| 417 | struct idetape_bh *bh = pc->bh; |
| 418 | int count; |
| 419 | |
| 420 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 422 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 423 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | return; |
| 425 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
Bartlomiej Zolnierkiewicz | 9567b34 | 2008-04-28 23:44:36 +0200 | [diff] [blame] | 427 | drive->hwif->output_data(drive, NULL, pc->b_data, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | bcount -= count; |
| 429 | pc->b_data += count; |
| 430 | pc->b_count -= count; |
| 431 | if (!pc->b_count) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 432 | bh = bh->b_reqnext; |
| 433 | pc->bh = bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | if (bh) { |
| 435 | pc->b_data = bh->b_data; |
| 436 | pc->b_count = atomic_read(&bh->b_count); |
| 437 | } |
| 438 | } |
| 439 | } |
| 440 | } |
| 441 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 442 | static void idetape_update_buffers(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | { |
| 444 | struct idetape_bh *bh = pc->bh; |
| 445 | int count; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 446 | unsigned int bcount = pc->xferred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 448 | if (pc->flags & PC_FLAG_WRITING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | return; |
| 450 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 452 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 453 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | return; |
| 455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
| 457 | atomic_set(&bh->b_count, count); |
| 458 | if (atomic_read(&bh->b_count) == bh->b_size) |
| 459 | bh = bh->b_reqnext; |
| 460 | bcount -= count; |
| 461 | } |
| 462 | pc->bh = bh; |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * idetape_next_pc_storage returns a pointer to a place in which we can |
| 467 | * safely store a packet command, even though we intend to leave the |
| 468 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet |
| 469 | * commands is allocated at initialization time. |
| 470 | */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 471 | 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] | 472 | { |
| 473 | idetape_tape_t *tape = drive->driver_data; |
| 474 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 475 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
| 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 478 | tape->pc_stack_index = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | return (&tape->pc_stack[tape->pc_stack_index++]); |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. |
| 484 | * Since we queue packet commands in the request queue, we need to |
| 485 | * allocate a request, along with the allocation of a packet command. |
| 486 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | /************************************************************** |
| 489 | * * |
| 490 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * |
| 491 | * followed later on by kfree(). -ml * |
| 492 | * * |
| 493 | **************************************************************/ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 494 | |
| 495 | static struct request *idetape_next_rq_storage(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
| 497 | idetape_tape_t *tape = drive->driver_data; |
| 498 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 499 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
| 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 502 | tape->rq_stack_index = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | return (&tape->rq_stack[tape->rq_stack_index++]); |
| 504 | } |
| 505 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 506 | static void idetape_init_pc(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
| 508 | memset(pc->c, 0, 12); |
| 509 | pc->retries = 0; |
| 510 | pc->flags = 0; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 511 | pc->req_xfer = 0; |
| 512 | pc->buf = pc->pc_buf; |
| 513 | pc->buf_size = IDETAPE_PC_BUFFER_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | pc->bh = NULL; |
| 515 | pc->b_data = NULL; |
| 516 | } |
| 517 | |
| 518 | /* |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 519 | * called on each failed packet command retry to analyze the request sense. We |
| 520 | * currently do not utilize this information. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | */ |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 522 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
| 524 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 525 | struct ide_atapi_pc *pc = tape->failed_pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 527 | tape->sense_key = sense[2] & 0xF; |
| 528 | tape->asc = sense[12]; |
| 529 | tape->ascq = sense[13]; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 530 | |
| 531 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", |
| 532 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 534 | /* Correct pc->xferred by asking the tape. */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 535 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 536 | pc->xferred = pc->req_xfer - |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 537 | tape->blk_size * |
Harvey Harrison | 5d0cc8a | 2008-07-15 21:21:41 +0200 | [diff] [blame] | 538 | get_unaligned_be32(&sense[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | idetape_update_buffers(pc); |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * If error was the result of a zero-length read or write command, |
| 544 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
| 545 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
| 546 | */ |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 547 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 548 | /* length == 0 */ |
| 549 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
| 550 | if (tape->sense_key == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | /* don't report an error, everything's ok */ |
| 552 | pc->error = 0; |
| 553 | /* don't retry read/write */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 554 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 557 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | pc->error = IDETAPE_ERROR_FILEMARK; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 559 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 561 | if (pc->c[0] == WRITE_6) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 562 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
| 563 | && tape->asc == 0x0 && tape->ascq == 0x2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | pc->error = IDETAPE_ERROR_EOD; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 565 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 568 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 569 | if (tape->sense_key == 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | pc->error = IDETAPE_ERROR_EOD; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 571 | pc->flags |= PC_FLAG_ABORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 573 | if (!(pc->flags & PC_FLAG_ABORT) && |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 574 | pc->xferred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
| 576 | } |
| 577 | } |
| 578 | |
Borislav Petkov | d01dbc3 | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 579 | /* Free data buffers completely. */ |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 580 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 582 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Borislav Petkov | d01dbc3 | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 584 | while (bh) { |
| 585 | u32 size = bh->b_size; |
| 586 | |
| 587 | while (size) { |
| 588 | unsigned int order = fls(size >> PAGE_SHIFT)-1; |
| 589 | |
| 590 | if (bh->b_data) |
| 591 | free_pages((unsigned long)bh->b_data, order); |
| 592 | |
| 593 | size &= (order-1); |
| 594 | bh->b_data += (1 << order) * PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | prev_bh = bh; |
| 597 | bh = bh->b_reqnext; |
| 598 | kfree(prev_bh); |
| 599 | } |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 600 | kfree(tape->merge_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | } |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
| 604 | { |
| 605 | struct request *rq = HWGROUP(drive)->rq; |
| 606 | idetape_tape_t *tape = drive->driver_data; |
| 607 | unsigned long flags; |
| 608 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 610 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | switch (uptodate) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 613 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
| 614 | case 1: error = 0; break; |
| 615 | default: error = uptodate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
| 617 | rq->errors = error; |
| 618 | if (error) |
| 619 | tape->failed_pc = NULL; |
| 620 | |
Bartlomiej Zolnierkiewicz | 3687221 | 2008-01-26 20:13:10 +0100 | [diff] [blame] | 621 | if (!blk_special_request(rq)) { |
| 622 | ide_end_request(drive, uptodate, nr_sects); |
| 623 | return 0; |
| 624 | } |
| 625 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 626 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | ide_end_drive_cmd(drive, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 630 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | return 0; |
| 632 | } |
| 633 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 634 | static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | { |
| 636 | idetape_tape_t *tape = drive->driver_data; |
| 637 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 638 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | if (!tape->pc->error) { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 641 | idetape_analyze_error(drive, tape->pc->buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | idetape_end_request(drive, 1, 0); |
| 643 | } else { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 644 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - " |
| 645 | "Aborting request!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | idetape_end_request(drive, 0, 0); |
| 647 | } |
| 648 | return ide_stopped; |
| 649 | } |
| 650 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 651 | static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 653 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 654 | pc->c[0] = REQUEST_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | pc->c[4] = 20; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 656 | pc->req_xfer = 20; |
| 657 | pc->idetape_callback = &idetape_request_sense_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | static void idetape_init_rq(struct request *rq, u8 cmd) |
| 661 | { |
FUJITA Tomonori | e7b241a | 2008-04-29 09:54:38 +0200 | [diff] [blame] | 662 | blk_rq_init(NULL, rq); |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 663 | rq->cmd_type = REQ_TYPE_SPECIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | rq->cmd[0] = cmd; |
| 665 | } |
| 666 | |
| 667 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 668 | * Generate a new packet command request in front of the request queue, before |
| 669 | * the current request, so that it will be processed immediately, on the next |
| 670 | * pass through the driver. The function below is called from the request |
| 671 | * handling part of the driver (the "bottom" part). Safe storage for the request |
| 672 | * 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] | 673 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 674 | * Memory for those requests is pre-allocated at initialization time, and is |
| 675 | * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for |
| 676 | * the maximum possible number of inter-dependent packet commands. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 678 | * The higher level of the driver - The ioctl handler and the character device |
| 679 | * handling functions should queue request to the lower level part and wait for |
| 680 | * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 682 | 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] | 683 | struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | { |
| 685 | struct ide_tape_obj *tape = drive->driver_data; |
| 686 | |
| 687 | idetape_init_rq(rq, REQ_IDETAPE_PC1); |
Bartlomiej Zolnierkiewicz | e8a96aa | 2008-07-15 21:21:41 +0200 | [diff] [blame] | 688 | rq->cmd_flags |= REQ_PREEMPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | rq->buffer = (char *) pc; |
| 690 | rq->rq_disk = tape->disk; |
FUJITA Tomonori | 63f5abb | 2008-07-15 21:21:51 +0200 | [diff] [blame] | 691 | ide_do_drive_cmd(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | /* |
| 695 | * idetape_retry_pc is called when an error was detected during the |
| 696 | * last packet command. We queue a request sense packet command in |
| 697 | * the head of the request list. |
| 698 | */ |
| 699 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) |
| 700 | { |
| 701 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 702 | struct ide_atapi_pc *pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | struct request *rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Bartlomiej Zolnierkiewicz | 64a57fe | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 705 | (void)ide_read_error(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | pc = idetape_next_pc_storage(drive); |
| 707 | rq = idetape_next_rq_storage(drive); |
| 708 | idetape_create_request_sense_cmd(pc); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 709 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | idetape_queue_pc_head(drive, pc, rq); |
| 711 | return ide_stopped; |
| 712 | } |
| 713 | |
| 714 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 715 | * Postpone the current request so that ide.c will be able to service requests |
| 716 | * 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] | 717 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 718 | static void idetape_postpone_request(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
| 720 | idetape_tape_t *tape = drive->driver_data; |
| 721 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 722 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | tape->postponed_rq = HWGROUP(drive)->rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 725 | ide_stall_queue(drive, tape->dsc_poll_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 728 | 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] | 729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | /* |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 731 | * This is the usual interrupt handler which will be called during a packet |
| 732 | * command. We will transfer some of the data (as requested by the drive) and |
| 733 | * will re-point interrupt handler to us. When data transfer is finished, we |
| 734 | * will act according to the algorithm described before |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 735 | * idetape_issue_pc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | */ |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 737 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | { |
| 739 | ide_hwif_t *hwif = drive->hwif; |
| 740 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 741 | struct ide_atapi_pc *pc = tape->pc; |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 742 | xfer_func_t *xferfunc; |
| 743 | idetape_io_buf *iobuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | unsigned int temp; |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 745 | u16 bcount; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 746 | u8 stat, ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 748 | debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
| 750 | /* Clear the interrupt */ |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 751 | stat = ide_read_status(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 753 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 754 | if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 755 | pc->flags |= PC_FLAG_DMA_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } else { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 757 | pc->xferred = pc->req_xfer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | idetape_update_buffers(pc); |
| 759 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 760 | debug_log(DBG_PROCS, "DMA finished\n"); |
| 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | /* No more interrupts */ |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 765 | if ((stat & DRQ_STAT) == 0) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 766 | debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 767 | " transferred\n", pc->xferred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 769 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
Bartlomiej Zolnierkiewicz | 87429bd | 2008-07-15 21:21:53 +0200 | [diff] [blame] | 770 | local_irq_enable_in_hardirq(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 772 | if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 773 | stat &= ~ERR_STAT; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 774 | if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 775 | /* Error detected */ |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 776 | debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
| 777 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 778 | if (pc->c[0] == REQUEST_SENSE) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 779 | printk(KERN_ERR "ide-tape: I/O error in request" |
| 780 | " sense command\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | return ide_do_reset(drive); |
| 782 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 783 | debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
| 784 | pc->c[0]); |
| 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | /* Retry operation */ |
| 787 | return idetape_retry_pc(drive); |
| 788 | } |
| 789 | pc->error = 0; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 790 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 791 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | /* Media access command */ |
| 793 | tape->dsc_polling_start = jiffies; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 794 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
| 796 | /* Allow ide.c to handle other requests */ |
| 797 | idetape_postpone_request(drive); |
| 798 | return ide_stopped; |
| 799 | } |
| 800 | if (tape->failed_pc == pc) |
| 801 | tape->failed_pc = NULL; |
| 802 | /* Command finished - Call the callback function */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 803 | return pc->idetape_callback(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 805 | |
| 806 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
| 807 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | printk(KERN_ERR "ide-tape: The tape wants to issue more " |
| 809 | "interrupts in DMA mode\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 810 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | return ide_do_reset(drive); |
| 812 | } |
| 813 | /* Get the number of bytes to transfer on this interrupt. */ |
Bartlomiej Zolnierkiewicz | 4c3032d | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 814 | bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) | |
| 815 | hwif->INB(hwif->io_ports.lbam_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Bartlomiej Zolnierkiewicz | 4c3032d | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 817 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 819 | if (ireason & CD) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 820 | printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | return ide_do_reset(drive); |
| 822 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 823 | if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | /* Hopefully, we will never get here */ |
| 825 | printk(KERN_ERR "ide-tape: We wanted to %s, ", |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 826 | (ireason & IO) ? "Write" : "Read"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | 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] | 828 | (ireason & IO) ? "Read" : "Write"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | return ide_do_reset(drive); |
| 830 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 831 | if (!(pc->flags & PC_FLAG_WRITING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | /* Reading - Check that we have enough space */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 833 | temp = pc->xferred + bcount; |
| 834 | if (temp > pc->req_xfer) { |
| 835 | if (temp > pc->buf_size) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 836 | printk(KERN_ERR "ide-tape: The tape wants to " |
| 837 | "send us more data than expected " |
| 838 | "- discarding data\n"); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 839 | ide_pad_transfer(drive, 0, bcount); |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 840 | ide_set_handler(drive, &idetape_pc_intr, |
| 841 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | return ide_started; |
| 843 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 844 | debug_log(DBG_SENSE, "The tape wants to send us more " |
| 845 | "data than expected - allowing transfer\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 847 | iobuf = &idetape_input_buffers; |
Bartlomiej Zolnierkiewicz | 9567b34 | 2008-04-28 23:44:36 +0200 | [diff] [blame] | 848 | xferfunc = hwif->input_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } else { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 850 | iobuf = &idetape_output_buffers; |
Bartlomiej Zolnierkiewicz | 9567b34 | 2008-04-28 23:44:36 +0200 | [diff] [blame] | 851 | xferfunc = hwif->output_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 853 | |
| 854 | if (pc->bh) |
| 855 | iobuf(drive, pc, bcount); |
| 856 | else |
Bartlomiej Zolnierkiewicz | 9567b34 | 2008-04-28 23:44:36 +0200 | [diff] [blame] | 857 | xferfunc(drive, NULL, pc->cur_pos, bcount); |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | /* Update the current position */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 860 | pc->xferred += bcount; |
| 861 | pc->cur_pos += bcount; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 862 | |
| 863 | debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", |
| 864 | pc->c[0], bcount); |
| 865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | /* And set the interrupt handler again */ |
| 867 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 868 | return ide_started; |
| 869 | } |
| 870 | |
| 871 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 872 | * Packet Command Interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 874 | * The current Packet Command is available in tape->pc, and will not change |
| 875 | * until we finish handling it. Each packet command is associated with a |
| 876 | * callback function that will be called when the command is finished. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 878 | * The handling will be done in three stages: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 880 | * 1. idetape_issue_pc will send the packet command to the drive, and will set |
| 881 | * the interrupt handler to idetape_pc_intr. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 883 | * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
| 884 | * 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] | 885 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 886 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
| 887 | * process. In case of a successful initiation of a media access packet command, |
| 888 | * the DSC bit will be set when the actual execution of the command is finished. |
| 889 | * Since the tape drive will not issue an interrupt, we have to poll for this |
| 890 | * event. In this case, we define the request as "low priority request" by |
| 891 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and |
| 892 | * exit the driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 894 | * ide.c will then give higher priority to requests which originate from the |
| 895 | * other device, until will change rq_status to RQ_ACTIVE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 897 | * 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] | 898 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 899 | * 5. In case an error was found, we queue a request sense packet command in |
| 900 | * front of the request queue and retry the operation up to |
| 901 | * IDETAPE_MAX_PC_RETRIES times. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 903 | * 6. In case no error was found, or we decided to give up and not to retry |
| 904 | * again, the callback function will be called and then we will handle the next |
| 905 | * request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | */ |
| 907 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
| 908 | { |
| 909 | ide_hwif_t *hwif = drive->hwif; |
| 910 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 911 | struct ide_atapi_pc *pc = tape->pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | int retries = 100; |
| 913 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 914 | u8 ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 916 | if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { |
| 917 | printk(KERN_ERR "ide-tape: Strange, packet command initiated " |
| 918 | "yet DRQ isn't asserted\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | return startstop; |
| 920 | } |
Bartlomiej Zolnierkiewicz | 4c3032d | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 921 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 922 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
| 924 | "a packet command, retrying\n"); |
| 925 | udelay(100); |
Bartlomiej Zolnierkiewicz | 4c3032d | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 926 | ireason = hwif->INB(hwif->io_ports.nsect_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | if (retries == 0) { |
| 928 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " |
| 929 | "issuing a packet command, ignoring\n"); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 930 | ireason |= CD; |
| 931 | ireason &= ~IO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | } |
| 933 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 934 | if ((ireason & CD) == 0 || (ireason & IO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
| 936 | "a packet command\n"); |
| 937 | return ide_do_reset(drive); |
| 938 | } |
| 939 | /* Set the interrupt routine */ |
| 940 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
Bartlomiej Zolnierkiewicz | 91395a1 | 2008-07-15 21:21:54 +0200 | [diff] [blame] | 941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | /* Begin DMA, if necessary */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 943 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 944 | hwif->dma_ops->dma_start(drive); |
Bartlomiej Zolnierkiewicz | 91395a1 | 2008-07-15 21:21:54 +0200 | [diff] [blame] | 945 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | /* Send the actual packet */ |
Bartlomiej Zolnierkiewicz | 9567b34 | 2008-04-28 23:44:36 +0200 | [diff] [blame] | 947 | hwif->output_data(drive, NULL, pc->c, 12); |
| 948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | return ide_started; |
| 950 | } |
| 951 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 952 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
| 953 | struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | { |
| 955 | ide_hwif_t *hwif = drive->hwif; |
| 956 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | int dma_ok = 0; |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 958 | u16 bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 960 | if (tape->pc->c[0] == REQUEST_SENSE && |
| 961 | pc->c[0] == REQUEST_SENSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
| 963 | "Two request sense in serial were issued\n"); |
| 964 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 966 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | tape->failed_pc = pc; |
| 968 | /* Set the current packet command */ |
| 969 | tape->pc = pc; |
| 970 | |
| 971 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 972 | (pc->flags & PC_FLAG_ABORT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 974 | * We will "abort" retrying a packet command in case legitimate |
| 975 | * error code was received (crossing a filemark, or end of the |
| 976 | * media, for example). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 978 | if (!(pc->flags & PC_FLAG_ABORT)) { |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 979 | if (!(pc->c[0] == TEST_UNIT_READY && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | tape->sense_key == 2 && tape->asc == 4 && |
| 981 | (tape->ascq == 1 || tape->ascq == 8))) { |
| 982 | printk(KERN_ERR "ide-tape: %s: I/O error, " |
| 983 | "pc = %2x, key = %2x, " |
| 984 | "asc = %2x, ascq = %2x\n", |
| 985 | tape->name, pc->c[0], |
| 986 | tape->sense_key, tape->asc, |
| 987 | tape->ascq); |
| 988 | } |
| 989 | /* Giving up */ |
| 990 | pc->error = IDETAPE_ERROR_GENERAL; |
| 991 | } |
| 992 | tape->failed_pc = NULL; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 993 | return pc->idetape_callback(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 995 | 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] | 996 | |
| 997 | pc->retries++; |
| 998 | /* We haven't transferred any data yet */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 999 | pc->xferred = 0; |
| 1000 | pc->cur_pos = pc->buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | /* Request to transfer the entire buffer at once */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1002 | bcount = pc->req_xfer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1004 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
| 1005 | pc->flags &= ~PC_FLAG_DMA_ERROR; |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 1006 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1008 | if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma) |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 1009 | dma_ok = !hwif->dma_ops->dma_setup(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
Bartlomiej Zolnierkiewicz | 9a410e7 | 2008-07-15 21:21:48 +0200 | [diff] [blame] | 1011 | ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1012 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1013 | if (dma_ok) |
| 1014 | /* Will begin DMA later */ |
| 1015 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; |
| 1016 | if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) { |
Bartlomiej Zolnierkiewicz | c1c9dbc | 2008-02-02 19:56:44 +0100 | [diff] [blame] | 1017 | ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
| 1018 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | return ide_started; |
| 1020 | } else { |
Bartlomiej Zolnierkiewicz | 1fc1425 | 2008-04-28 23:44:39 +0200 | [diff] [blame] | 1021 | ide_execute_pkt_cmd(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | return idetape_transfer_pc(drive); |
| 1023 | } |
| 1024 | } |
| 1025 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1026 | static ide_startstop_t idetape_pc_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | { |
| 1028 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1029 | |
| 1030 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | |
| 1032 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); |
| 1033 | return ide_stopped; |
| 1034 | } |
| 1035 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1036 | /* A mode sense command is used to "sense" tape parameters. */ |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1037 | 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] | 1038 | { |
| 1039 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1040 | pc->c[0] = MODE_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1042 | /* DBD = 1 - Don't return block descriptors */ |
| 1043 | pc->c[1] = 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | pc->c[2] = page_code; |
| 1045 | /* |
| 1046 | * Changed pc->c[3] to 0 (255 will at best return unused info). |
| 1047 | * |
| 1048 | * For SCSI this byte is defined as subpage instead of high byte |
| 1049 | * of length and some IDE drives seem to interpret it this way |
| 1050 | * and return an error when 255 is used. |
| 1051 | */ |
| 1052 | pc->c[3] = 0; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1053 | /* We will just discard data in that case */ |
| 1054 | pc->c[4] = 255; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1056 | pc->req_xfer = 12; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1058 | pc->req_xfer = 24; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | else |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1060 | pc->req_xfer = 50; |
| 1061 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } |
| 1063 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1064 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | { |
| 1066 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1067 | struct ide_atapi_pc *pc = tape->pc; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1068 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1070 | stat = ide_read_status(drive); |
| 1071 | |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1072 | if (stat & SEEK_STAT) { |
| 1073 | if (stat & ERR_STAT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | /* Error detected */ |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1075 | if (pc->c[0] != TEST_UNIT_READY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
| 1077 | tape->name); |
| 1078 | /* Retry operation */ |
| 1079 | return idetape_retry_pc(drive); |
| 1080 | } |
| 1081 | pc->error = 0; |
| 1082 | if (tape->failed_pc == pc) |
| 1083 | tape->failed_pc = NULL; |
| 1084 | } else { |
| 1085 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1086 | tape->failed_pc = NULL; |
| 1087 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1088 | return pc->idetape_callback(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } |
| 1090 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1091 | static ide_startstop_t idetape_rw_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | { |
| 1093 | idetape_tape_t *tape = drive->driver_data; |
| 1094 | struct request *rq = HWGROUP(drive)->rq; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1095 | int blocks = tape->pc->xferred / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1097 | tape->avg_size += blocks * tape->blk_size; |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1098 | |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 1099 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1100 | tape->avg_speed = tape->avg_size * HZ / |
| 1101 | (jiffies - tape->avg_time) / 1024; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | tape->avg_size = 0; |
| 1103 | tape->avg_time = jiffies; |
| 1104 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1105 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1107 | tape->first_frame += blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | rq->current_nr_sectors -= blocks; |
| 1109 | |
| 1110 | if (!tape->pc->error) |
| 1111 | idetape_end_request(drive, 1, 0); |
| 1112 | else |
| 1113 | idetape_end_request(drive, tape->pc->error, 0); |
| 1114 | return ide_stopped; |
| 1115 | } |
| 1116 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1117 | static void idetape_create_read_cmd(idetape_tape_t *tape, |
| 1118 | struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1119 | unsigned int length, struct idetape_bh *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | { |
| 1121 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1122 | pc->c[0] = READ_6; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1123 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | pc->c[1] = 1; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1125 | pc->idetape_callback = &idetape_rw_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | pc->bh = bh; |
| 1127 | atomic_set(&bh->b_count, 0); |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1128 | pc->buf = NULL; |
| 1129 | pc->buf_size = length * tape->blk_size; |
| 1130 | pc->req_xfer = pc->buf_size; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 1131 | if (pc->req_xfer == tape->buffer_size) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1132 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | } |
| 1134 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1135 | static void idetape_create_write_cmd(idetape_tape_t *tape, |
| 1136 | struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1137 | unsigned int length, struct idetape_bh *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | { |
| 1139 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1140 | pc->c[0] = WRITE_6; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1141 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | pc->c[1] = 1; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1143 | pc->idetape_callback = &idetape_rw_callback; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1144 | pc->flags |= PC_FLAG_WRITING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | pc->bh = bh; |
| 1146 | pc->b_data = bh->b_data; |
| 1147 | pc->b_count = atomic_read(&bh->b_count); |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1148 | pc->buf = NULL; |
| 1149 | pc->buf_size = length * tape->blk_size; |
| 1150 | pc->req_xfer = pc->buf_size; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 1151 | if (pc->req_xfer == tape->buffer_size) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1152 | pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | } |
| 1154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
| 1156 | struct request *rq, sector_t block) |
| 1157 | { |
| 1158 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1159 | struct ide_atapi_pc *pc = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | struct request *postponed_rq = tape->postponed_rq; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1161 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1163 | debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
| 1164 | " current_nr_sectors: %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1167 | if (!blk_special_request(rq)) { |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1168 | /* We do not support buffer cache originated requests. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1170 | "request queue (%d)\n", drive->name, rq->cmd_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | ide_end_request(drive, 0, 0); |
| 1172 | return ide_stopped; |
| 1173 | } |
| 1174 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1175 | /* Retry a failed packet command */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1176 | if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1177 | return idetape_issue_pc(drive, tape->failed_pc); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | if (postponed_rq != NULL) |
| 1180 | if (rq != postponed_rq) { |
| 1181 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " |
| 1182 | "Two DSC requests were queued\n"); |
| 1183 | idetape_end_request(drive, 0, 0); |
| 1184 | return ide_stopped; |
| 1185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | tape->postponed_rq = NULL; |
| 1188 | |
| 1189 | /* |
| 1190 | * If the tape is still busy, postpone our request and service |
| 1191 | * the other device meanwhile. |
| 1192 | */ |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1193 | stat = ide_read_status(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | |
| 1195 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1196 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
| 1198 | if (drive->post_reset == 1) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1199 | set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | drive->post_reset = 0; |
| 1201 | } |
| 1202 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1203 | if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1204 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | if (postponed_rq == NULL) { |
| 1206 | tape->dsc_polling_start = jiffies; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1207 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
| 1209 | } else if (time_after(jiffies, tape->dsc_timeout)) { |
| 1210 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", |
| 1211 | tape->name); |
| 1212 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 1213 | idetape_media_access_finished(drive); |
| 1214 | return ide_stopped; |
| 1215 | } else { |
| 1216 | return ide_do_reset(drive); |
| 1217 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1218 | } else if (time_after(jiffies, |
| 1219 | tape->dsc_polling_start + |
| 1220 | IDETAPE_DSC_MA_THRESHOLD)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1221 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | idetape_postpone_request(drive); |
| 1223 | return ide_stopped; |
| 1224 | } |
| 1225 | if (rq->cmd[0] & REQ_IDETAPE_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | pc = idetape_next_pc_storage(drive); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1227 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, |
| 1228 | (struct idetape_bh *)rq->special); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | goto out; |
| 1230 | } |
| 1231 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | pc = idetape_next_pc_storage(drive); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1233 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, |
| 1234 | (struct idetape_bh *)rq->special); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | goto out; |
| 1236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1238 | pc = (struct ide_atapi_pc *) rq->buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
| 1240 | rq->cmd[0] |= REQ_IDETAPE_PC2; |
| 1241 | goto out; |
| 1242 | } |
| 1243 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 1244 | idetape_media_access_finished(drive); |
| 1245 | return ide_stopped; |
| 1246 | } |
| 1247 | BUG(); |
| 1248 | out: |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1249 | return idetape_issue_pc(drive, pc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | } |
| 1251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | /* |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1253 | * The function below uses __get_free_pages to allocate a data buffer of size |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 1254 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1255 | * much as possible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | * |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1257 | * It returns a pointer to the newly allocated buffer, or NULL in case of |
| 1258 | * failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | */ |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1260 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, |
| 1261 | int full, int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | { |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1263 | struct idetape_bh *prev_bh, *bh, *merge_bh; |
Borislav Petkov | a997a43 | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 1264 | int pages = tape->pages_per_buffer; |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1265 | unsigned int order, b_allocd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | char *b_data = NULL; |
| 1267 | |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1268 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
| 1269 | bh = merge_bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | if (bh == NULL) |
| 1271 | goto abort; |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1272 | |
| 1273 | order = fls(pages) - 1; |
| 1274 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1275 | if (!bh->b_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | goto abort; |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1277 | b_allocd = (1 << order) * PAGE_SIZE; |
| 1278 | pages &= (order-1); |
| 1279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | if (clear) |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1281 | memset(bh->b_data, 0, b_allocd); |
| 1282 | bh->b_reqnext = NULL; |
| 1283 | bh->b_size = b_allocd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 1285 | |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1286 | while (pages) { |
| 1287 | order = fls(pages) - 1; |
| 1288 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1289 | if (!b_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | goto abort; |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1291 | b_allocd = (1 << order) * PAGE_SIZE; |
| 1292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | if (clear) |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1294 | memset(b_data, 0, b_allocd); |
| 1295 | |
| 1296 | /* newly allocated page frames below buffer header or ...*/ |
| 1297 | if (bh->b_data == b_data + b_allocd) { |
| 1298 | bh->b_size += b_allocd; |
| 1299 | bh->b_data -= b_allocd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | if (full) |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1301 | atomic_add(b_allocd, &bh->b_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | continue; |
| 1303 | } |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1304 | /* they are above the header */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | if (b_data == bh->b_data + bh->b_size) { |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1306 | bh->b_size += b_allocd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | if (full) |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1308 | atomic_add(b_allocd, &bh->b_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | continue; |
| 1310 | } |
| 1311 | prev_bh = bh; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1312 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
| 1313 | if (!bh) { |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1314 | free_pages((unsigned long) b_data, order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | goto abort; |
| 1316 | } |
| 1317 | bh->b_reqnext = NULL; |
| 1318 | bh->b_data = b_data; |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1319 | bh->b_size = b_allocd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 1321 | prev_bh->b_reqnext = bh; |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1322 | |
| 1323 | pages &= (order-1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | } |
Borislav Petkov | 41aa170 | 2008-04-27 15:38:32 +0200 | [diff] [blame] | 1325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | bh->b_size -= tape->excess_bh_size; |
| 1327 | if (full) |
| 1328 | atomic_sub(tape->excess_bh_size, &bh->b_count); |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1329 | return merge_bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | abort: |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1331 | ide_tape_kfree_buffer(tape); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | return NULL; |
| 1333 | } |
| 1334 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1335 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 1336 | const char __user *buf, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | { |
| 1338 | struct idetape_bh *bh = tape->bh; |
| 1339 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1340 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | |
| 1342 | while (n) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1344 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 1345 | __func__); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1346 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1348 | count = min((unsigned int) |
| 1349 | (bh->b_size - atomic_read(&bh->b_count)), |
| 1350 | (unsigned int)n); |
| 1351 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, |
| 1352 | count)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1353 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | n -= count; |
| 1355 | atomic_add(count, &bh->b_count); |
| 1356 | buf += count; |
| 1357 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 1358 | bh = bh->b_reqnext; |
| 1359 | if (bh) |
| 1360 | atomic_set(&bh->b_count, 0); |
| 1361 | } |
| 1362 | } |
| 1363 | tape->bh = bh; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1364 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | } |
| 1366 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1367 | 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] | 1368 | int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | { |
| 1370 | struct idetape_bh *bh = tape->bh; |
| 1371 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1372 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
| 1374 | while (n) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1376 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| 1377 | __func__); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1378 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | count = min(tape->b_count, n); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1381 | if (copy_to_user(buf, tape->b_data, count)) |
| 1382 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | n -= count; |
| 1384 | tape->b_data += count; |
| 1385 | tape->b_count -= count; |
| 1386 | buf += count; |
| 1387 | if (!tape->b_count) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1388 | bh = bh->b_reqnext; |
| 1389 | tape->bh = bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | if (bh) { |
| 1391 | tape->b_data = bh->b_data; |
| 1392 | tape->b_count = atomic_read(&bh->b_count); |
| 1393 | } |
| 1394 | } |
| 1395 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1396 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | } |
| 1398 | |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1399 | static void idetape_init_merge_buffer(idetape_tape_t *tape) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | { |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1401 | struct idetape_bh *bh = tape->merge_bh; |
| 1402 | tape->bh = tape->merge_bh; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1403 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1404 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | atomic_set(&bh->b_count, 0); |
| 1406 | else { |
| 1407 | tape->b_data = bh->b_data; |
| 1408 | tape->b_count = atomic_read(&bh->b_count); |
| 1409 | } |
| 1410 | } |
| 1411 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1412 | static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | { |
| 1414 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1415 | u8 *readpos = tape->pc->buf; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1416 | |
| 1417 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | |
| 1419 | if (!tape->pc->error) { |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1420 | debug_log(DBG_SENSE, "BOP - %s\n", |
| 1421 | (readpos[0] & 0x80) ? "Yes" : "No"); |
| 1422 | debug_log(DBG_SENSE, "EOP - %s\n", |
| 1423 | (readpos[0] & 0x40) ? "Yes" : "No"); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1424 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1425 | if (readpos[0] & 0x4) { |
| 1426 | printk(KERN_INFO "ide-tape: Block location is unknown" |
| 1427 | "to the tape\n"); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1428 | clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | idetape_end_request(drive, 0, 0); |
| 1430 | } else { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1431 | debug_log(DBG_SENSE, "Block Location - %u\n", |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1432 | be32_to_cpu(*(u32 *)&readpos[4])); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1433 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1434 | tape->partition = readpos[1]; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1435 | tape->first_frame = |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1436 | be32_to_cpu(*(u32 *)&readpos[4]); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1437 | set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | idetape_end_request(drive, 1, 0); |
| 1439 | } |
| 1440 | } else { |
| 1441 | idetape_end_request(drive, 0, 0); |
| 1442 | } |
| 1443 | return ide_stopped; |
| 1444 | } |
| 1445 | |
| 1446 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1447 | * Write a filemark if write_filemark=1. Flush the device buffers without |
| 1448 | * writing a filemark otherwise. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1450 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1451 | struct ide_atapi_pc *pc, int write_filemark) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | { |
| 1453 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1454 | pc->c[0] = WRITE_FILEMARKS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | pc->c[4] = write_filemark; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1456 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1457 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | } |
| 1459 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1460 | 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] | 1461 | { |
| 1462 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1463 | pc->c[0] = TEST_UNIT_READY; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1464 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | } |
| 1466 | |
| 1467 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1468 | * We add a special packet command request to the tail of the request queue, and |
| 1469 | * wait for it to be serviced. This is not to be called from within the request |
| 1470 | * handling part of the driver! We allocate here data on the stack and it is |
| 1471 | * valid until the request is finished. This is not the case for the bottom part |
| 1472 | * of the driver, where we are always leaving the functions to wait for an |
| 1473 | * interrupt or a timer event. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1475 | * From the bottom part of the driver, we should allocate safe memory using |
| 1476 | * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request |
| 1477 | * to the request list without waiting for it to be serviced! In that case, we |
| 1478 | * usually use idetape_queue_pc_head(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | */ |
Borislav Petkov | ea1ab3d | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1480 | 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] | 1481 | { |
| 1482 | struct ide_tape_obj *tape = drive->driver_data; |
FUJITA Tomonori | 64ea1b4 | 2008-07-15 21:21:43 +0200 | [diff] [blame] | 1483 | struct request *rq; |
| 1484 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | |
FUJITA Tomonori | 64ea1b4 | 2008-07-15 21:21:43 +0200 | [diff] [blame] | 1486 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
| 1487 | rq->cmd_type = REQ_TYPE_SPECIAL; |
| 1488 | rq->cmd[0] = REQ_IDETAPE_PC1; |
| 1489 | rq->buffer = (char *)pc; |
| 1490 | error = blk_execute_rq(drive->queue, tape->disk, rq, 0); |
| 1491 | blk_put_request(rq); |
| 1492 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | } |
| 1494 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1495 | static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
| 1496 | struct ide_atapi_pc *pc, int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | { |
| 1498 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1499 | pc->c[0] = START_STOP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | pc->c[4] = cmd; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1501 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1502 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | } |
| 1504 | |
| 1505 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
| 1506 | { |
| 1507 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1508 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | int load_attempted = 0; |
| 1510 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1511 | /* Wait for the tape to become ready */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1512 | set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | timeout += jiffies; |
| 1514 | while (time_before(jiffies, timeout)) { |
| 1515 | idetape_create_test_unit_ready_cmd(&pc); |
Borislav Petkov | ea1ab3d | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1516 | if (!idetape_queue_pc_tail(drive, &pc)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | return 0; |
| 1518 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1519 | || (tape->asc == 0x3A)) { |
| 1520 | /* no media */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | if (load_attempted) |
| 1522 | return -ENOMEDIUM; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1523 | idetape_create_load_unload_cmd(drive, &pc, |
| 1524 | IDETAPE_LU_LOAD_MASK); |
Borislav Petkov | ea1ab3d | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1525 | idetape_queue_pc_tail(drive, &pc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | load_attempted = 1; |
| 1527 | /* not about to be ready */ |
| 1528 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && |
| 1529 | (tape->ascq == 1 || tape->ascq == 8))) |
| 1530 | return -EIO; |
Nishanth Aravamudan | 80ce45f | 2005-09-10 00:27:08 -0700 | [diff] [blame] | 1531 | msleep(100); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | } |
| 1533 | return -EIO; |
| 1534 | } |
| 1535 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1536 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1538 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | int rc; |
| 1540 | |
| 1541 | idetape_create_write_filemark_cmd(drive, &pc, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1542 | rc = idetape_queue_pc_tail(drive, &pc); |
| 1543 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | return rc; |
| 1545 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 1546 | return 0; |
| 1547 | } |
| 1548 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1549 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | { |
| 1551 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1552 | pc->c[0] = READ_POSITION; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1553 | pc->req_xfer = 20; |
| 1554 | pc->idetape_callback = &idetape_read_position_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | } |
| 1556 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1557 | static int idetape_read_position(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | { |
| 1559 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1560 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | int position; |
| 1562 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1563 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | |
| 1565 | idetape_create_read_position_cmd(&pc); |
| 1566 | if (idetape_queue_pc_tail(drive, &pc)) |
| 1567 | return -1; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1568 | position = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | return position; |
| 1570 | } |
| 1571 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1572 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
| 1573 | struct ide_atapi_pc *pc, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1574 | unsigned int block, u8 partition, int skip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | { |
| 1576 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1577 | pc->c[0] = POSITION_TO_ELEMENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | pc->c[1] = 2; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1579 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | pc->c[8] = partition; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1581 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1582 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | } |
| 1584 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1585 | static int idetape_create_prevent_cmd(ide_drive_t *drive, |
| 1586 | struct ide_atapi_pc *pc, int prevent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | { |
| 1588 | idetape_tape_t *tape = drive->driver_data; |
| 1589 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 1590 | /* device supports locking according to capabilities page */ |
| 1591 | if (!(tape->caps[6] & 0x01)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | return 0; |
| 1593 | |
| 1594 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1595 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | pc->c[4] = prevent; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1597 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | return 1; |
| 1599 | } |
| 1600 | |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1601 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | { |
| 1603 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1605 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
Borislav Petkov | 9798630 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1606 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1608 | clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1609 | tape->merge_bh_size = 0; |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1610 | if (tape->merge_bh != NULL) { |
| 1611 | ide_tape_kfree_buffer(tape); |
| 1612 | tape->merge_bh = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | } |
| 1614 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1615 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | } |
| 1617 | |
| 1618 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1619 | * Position the tape to the requested block using the LOCATE packet command. |
| 1620 | * A READ POSITION command is then issued to check where we are positioned. Like |
| 1621 | * all higher level operations, we queue the commands at the tail of the request |
| 1622 | * queue and wait for their completion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1624 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
| 1625 | u8 partition, int skip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | { |
| 1627 | idetape_tape_t *tape = drive->driver_data; |
| 1628 | int retval; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1629 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1631 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1632 | __ide_tape_discard_merge_buffer(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 1634 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); |
| 1635 | retval = idetape_queue_pc_tail(drive, &pc); |
| 1636 | if (retval) |
| 1637 | return (retval); |
| 1638 | |
| 1639 | idetape_create_read_position_cmd(&pc); |
| 1640 | return (idetape_queue_pc_tail(drive, &pc)); |
| 1641 | } |
| 1642 | |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1643 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1644 | int restore_position) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | { |
| 1646 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | int seek, position; |
| 1648 | |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1649 | __ide_tape_discard_merge_buffer(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | if (restore_position) { |
| 1651 | position = idetape_read_position(drive); |
Borislav Petkov | 9798630 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1652 | seek = position > 0 ? position : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | if (idetape_position_tape(drive, seek, 0, 0)) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1654 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1655 | " %s\n", tape->name, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | return; |
| 1657 | } |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1662 | * Generate a read/write request for the block device interface and wait for it |
| 1663 | * to be serviced. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1665 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
| 1666 | struct idetape_bh *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | { |
| 1668 | idetape_tape_t *tape = drive->driver_data; |
FUJITA Tomonori | 64ea1b4 | 2008-07-15 21:21:43 +0200 | [diff] [blame] | 1669 | struct request *rq; |
| 1670 | int ret, errors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1672 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
| 1673 | |
FUJITA Tomonori | 64ea1b4 | 2008-07-15 21:21:43 +0200 | [diff] [blame] | 1674 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
| 1675 | rq->cmd_type = REQ_TYPE_SPECIAL; |
| 1676 | rq->cmd[0] = cmd; |
| 1677 | rq->rq_disk = tape->disk; |
| 1678 | rq->special = (void *)bh; |
| 1679 | rq->sector = tape->first_frame; |
| 1680 | rq->nr_sectors = blocks; |
| 1681 | rq->current_nr_sectors = blocks; |
| 1682 | blk_execute_rq(drive->queue, tape->disk, rq, 0); |
| 1683 | |
| 1684 | errors = rq->errors; |
| 1685 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); |
| 1686 | blk_put_request(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | |
| 1688 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) |
| 1689 | return 0; |
| 1690 | |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1691 | if (tape->merge_bh) |
| 1692 | idetape_init_merge_buffer(tape); |
FUJITA Tomonori | 64ea1b4 | 2008-07-15 21:21:43 +0200 | [diff] [blame] | 1693 | if (errors == IDETAPE_ERROR_GENERAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | return -EIO; |
FUJITA Tomonori | 64ea1b4 | 2008-07-15 21:21:43 +0200 | [diff] [blame] | 1695 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | } |
| 1697 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1698 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | { |
| 1700 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1701 | pc->c[0] = INQUIRY; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1702 | pc->c[4] = 254; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1703 | pc->req_xfer = 254; |
| 1704 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | } |
| 1706 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1707 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
| 1708 | struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | { |
| 1710 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1711 | pc->c[0] = REZERO_UNIT; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1712 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1713 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | } |
| 1715 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1716 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | { |
| 1718 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1719 | pc->c[0] = ERASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | pc->c[1] = 1; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1721 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1722 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | } |
| 1724 | |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1725 | 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] | 1726 | { |
| 1727 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1728 | pc->c[0] = SPACE; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1729 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | pc->c[1] = cmd; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1731 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1732 | pc->idetape_callback = &idetape_pc_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
Borislav Petkov | 97c566c | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 1735 | /* Queue up a character device originated write request. */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1736 | 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] | 1737 | { |
| 1738 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1740 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | |
Borislav Petkov | 0aa4b01 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1742 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1743 | blocks, tape->merge_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | } |
| 1745 | |
Borislav Petkov | d9df937 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1746 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | { |
| 1748 | idetape_tape_t *tape = drive->driver_data; |
| 1749 | int blocks, min; |
| 1750 | struct idetape_bh *bh; |
Borislav Petkov | 55a5d29 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 1751 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1752 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1753 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1754 | " but we are not writing.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | return; |
| 1756 | } |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1757 | if (tape->merge_bh_size > tape->buffer_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1759 | tape->merge_bh_size = tape->buffer_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | } |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1761 | if (tape->merge_bh_size) { |
| 1762 | blocks = tape->merge_bh_size / tape->blk_size; |
| 1763 | if (tape->merge_bh_size % tape->blk_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | unsigned int i; |
| 1765 | |
| 1766 | blocks++; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1767 | i = tape->blk_size - tape->merge_bh_size % |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1768 | tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | bh = tape->bh->b_reqnext; |
| 1770 | while (bh) { |
| 1771 | atomic_set(&bh->b_count, 0); |
| 1772 | bh = bh->b_reqnext; |
| 1773 | } |
| 1774 | bh = tape->bh; |
| 1775 | while (i) { |
| 1776 | if (bh == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1777 | printk(KERN_INFO "ide-tape: bug," |
| 1778 | " bh NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | break; |
| 1780 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1781 | min = min(i, (unsigned int)(bh->b_size - |
| 1782 | atomic_read(&bh->b_count))); |
| 1783 | memset(bh->b_data + atomic_read(&bh->b_count), |
| 1784 | 0, min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | atomic_add(min, &bh->b_count); |
| 1786 | i -= min; |
| 1787 | bh = bh->b_reqnext; |
| 1788 | } |
| 1789 | } |
| 1790 | (void) idetape_add_chrdev_write_request(drive, blocks); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1791 | tape->merge_bh_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | } |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1793 | if (tape->merge_bh != NULL) { |
| 1794 | ide_tape_kfree_buffer(tape); |
| 1795 | tape->merge_bh = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | } |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1797 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | } |
| 1799 | |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1800 | static int idetape_init_read(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | { |
| 1802 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | int bytes_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | |
| 1805 | /* Initialize read operation */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1806 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
| 1807 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
Borislav Petkov | d9df937 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1808 | ide_tape_flush_merge_buffer(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | idetape_flush_tape_buffers(drive); |
| 1810 | } |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1811 | if (tape->merge_bh || tape->merge_bh_size) { |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1812 | printk(KERN_ERR "ide-tape: merge_bh_size should be" |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1813 | " 0 now\n"); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1814 | tape->merge_bh_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | } |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1816 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
| 1817 | if (!tape->merge_bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | return -ENOMEM; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1819 | tape->chrdev_dir = IDETAPE_DIR_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | |
| 1821 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1822 | * Issue a read 0 command to ensure that DSC handshake is |
| 1823 | * switched from completion mode to buffer available mode. |
| 1824 | * No point in issuing this if DSC overlap isn't supported, some |
| 1825 | * drives (Seagate STT3401A) will return an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | */ |
| 1827 | if (drive->dsc_overlap) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1828 | bytes_read = idetape_queue_rw_tail(drive, |
| 1829 | REQ_IDETAPE_READ, 0, |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1830 | tape->merge_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | if (bytes_read < 0) { |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1832 | ide_tape_kfree_buffer(tape); |
| 1833 | tape->merge_bh = NULL; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1834 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | return bytes_read; |
| 1836 | } |
| 1837 | } |
| 1838 | } |
Borislav Petkov | 5e69bd9 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 1839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | return 0; |
| 1841 | } |
| 1842 | |
Borislav Petkov | 5bd50dc | 2008-04-27 15:38:28 +0200 | [diff] [blame] | 1843 | /* called from idetape_chrdev_read() to service a chrdev read request. */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1844 | 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] | 1845 | { |
| 1846 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1848 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1850 | /* If we are at a filemark, return a read length of 0 */ |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1851 | if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | return 0; |
| 1853 | |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1854 | idetape_init_read(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | |
Borislav Petkov | 5e69bd9 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 1856 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1857 | tape->merge_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | } |
| 1859 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1860 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | { |
| 1862 | idetape_tape_t *tape = drive->driver_data; |
| 1863 | struct idetape_bh *bh; |
| 1864 | int blocks; |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | while (bcount) { |
| 1867 | unsigned int count; |
| 1868 | |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1869 | bh = tape->merge_bh; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 1870 | count = min(tape->buffer_size, bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | bcount -= count; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1872 | blocks = count / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | while (count) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1874 | atomic_set(&bh->b_count, |
| 1875 | min(count, (unsigned int)bh->b_size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
| 1877 | count -= atomic_read(&bh->b_count); |
| 1878 | bh = bh->b_reqnext; |
| 1879 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1880 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1881 | tape->merge_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | } |
| 1883 | } |
| 1884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1886 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
| 1887 | * currently support only one partition. |
| 1888 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1889 | static int idetape_rewind_tape(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | { |
| 1891 | int retval; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1892 | struct ide_atapi_pc pc; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1893 | idetape_tape_t *tape; |
| 1894 | tape = drive->driver_data; |
| 1895 | |
| 1896 | debug_log(DBG_SENSE, "Enter %s\n", __func__); |
| 1897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | idetape_create_rewind_cmd(drive, &pc); |
| 1899 | retval = idetape_queue_pc_tail(drive, &pc); |
| 1900 | if (retval) |
| 1901 | return retval; |
| 1902 | |
| 1903 | idetape_create_read_position_cmd(&pc); |
| 1904 | retval = idetape_queue_pc_tail(drive, &pc); |
| 1905 | if (retval) |
| 1906 | return retval; |
| 1907 | return 0; |
| 1908 | } |
| 1909 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1910 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1911 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
| 1912 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | { |
| 1914 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1915 | void __user *argp = (void __user *)arg; |
| 1916 | |
Borislav Petkov | d59823f | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 1917 | struct idetape_config { |
| 1918 | int dsc_rw_frequency; |
| 1919 | int dsc_media_access_frequency; |
| 1920 | int nr_stages; |
| 1921 | } config; |
| 1922 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1923 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 1924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | switch (cmd) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1926 | case 0x0340: |
| 1927 | if (copy_from_user(&config, argp, sizeof(config))) |
| 1928 | return -EFAULT; |
| 1929 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1930 | break; |
| 1931 | case 0x0350: |
| 1932 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 1933 | config.nr_stages = 1; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1934 | if (copy_to_user(argp, &config, sizeof(config))) |
| 1935 | return -EFAULT; |
| 1936 | break; |
| 1937 | default: |
| 1938 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | } |
| 1940 | return 0; |
| 1941 | } |
| 1942 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1943 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
| 1944 | int mt_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | { |
| 1946 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 1947 | struct ide_atapi_pc pc; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1948 | int retval, count = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 1949 | int sprev = !!(tape->caps[4] & 0x20); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | |
| 1951 | if (mt_count == 0) |
| 1952 | return 0; |
| 1953 | if (MTBSF == mt_op || MTBSFM == mt_op) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 1954 | if (!sprev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | return -EIO; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1956 | mt_count = -mt_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | } |
| 1958 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1959 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1960 | tape->merge_bh_size = 0; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 1961 | if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | ++count; |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 1963 | ide_tape_discard_merge_buffer(drive, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | } |
| 1965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | switch (mt_op) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 1967 | case MTFSF: |
| 1968 | case MTBSF: |
| 1969 | idetape_create_space_cmd(&pc, mt_count - count, |
| 1970 | IDETAPE_SPACE_OVER_FILEMARK); |
| 1971 | return idetape_queue_pc_tail(drive, &pc); |
| 1972 | case MTFSFM: |
| 1973 | case MTBSFM: |
| 1974 | if (!sprev) |
| 1975 | return -EIO; |
| 1976 | retval = idetape_space_over_filemarks(drive, MTFSF, |
| 1977 | mt_count - count); |
| 1978 | if (retval) |
| 1979 | return retval; |
| 1980 | count = (MTBSFM == mt_op ? 1 : -1); |
| 1981 | return idetape_space_over_filemarks(drive, MTFSF, count); |
| 1982 | default: |
| 1983 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
| 1984 | mt_op); |
| 1985 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | } |
| 1987 | } |
| 1988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1990 | * Our character device read / write functions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1992 | * The tape is optimized to maximize throughput when it is transferring an |
| 1993 | * integral number of the "continuous transfer limit", which is a parameter of |
| 1994 | * the specific tape (26kB on my particular tape, 32kB for Onstream). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 1996 | * As of version 1.3 of the driver, the character device provides an abstract |
| 1997 | * continuous view of the media - any mix of block sizes (even 1 byte) on the |
| 1998 | * same backup/restore procedure is supported. The driver will internally |
| 1999 | * convert the requests to the recommended transfer unit, so that an unmatch |
| 2000 | * between the user's block size to the recommended size will only result in a |
| 2001 | * (slightly) increased driver overhead, but will no longer hit performance. |
| 2002 | * This is not applicable to Onstream. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2004 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
| 2005 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | { |
| 2007 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2008 | ide_drive_t *drive = tape->drive; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2009 | ssize_t bytes_read, temp, actually_read = 0, rc; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2010 | ssize_t ret = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2011 | u16 ctl = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2013 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2015 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2016 | if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2017 | if (count > tape->blk_size && |
| 2018 | (count % tape->blk_size) == 0) |
| 2019 | tape->user_bs_factor = count / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | } |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 2021 | rc = idetape_init_read(drive); |
Borislav Petkov | 8d06bfa | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2022 | if (rc < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | return rc; |
| 2024 | if (count == 0) |
| 2025 | return (0); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2026 | if (tape->merge_bh_size) { |
| 2027 | actually_read = min((unsigned int)(tape->merge_bh_size), |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2028 | (unsigned int)count); |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2029 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2030 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | buf += actually_read; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2032 | tape->merge_bh_size -= actually_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | count -= actually_read; |
| 2034 | } |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2035 | while (count >= tape->buffer_size) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2036 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | if (bytes_read <= 0) |
| 2038 | goto finish; |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2039 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2040 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | buf += bytes_read; |
| 2042 | count -= bytes_read; |
| 2043 | actually_read += bytes_read; |
| 2044 | } |
| 2045 | if (count) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2046 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | if (bytes_read <= 0) |
| 2048 | goto finish; |
| 2049 | temp = min((unsigned long)count, (unsigned long)bytes_read); |
Borislav Petkov | 99d74e6 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2050 | if (idetape_copy_stage_to_user(tape, buf, temp)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2051 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | actually_read += temp; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2053 | tape->merge_bh_size = bytes_read-temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | } |
| 2055 | finish: |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2056 | if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2057 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
| 2058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | idetape_space_over_filemarks(drive, MTFSF, 1); |
| 2060 | return 0; |
| 2061 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2062 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2063 | return ret ? ret : actually_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | } |
| 2065 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2066 | 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] | 2067 | size_t count, loff_t *ppos) |
| 2068 | { |
| 2069 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2070 | ide_drive_t *drive = tape->drive; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2071 | ssize_t actually_written = 0; |
| 2072 | ssize_t ret = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2073 | u16 ctl = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | |
| 2075 | /* The drive is write protected. */ |
| 2076 | if (tape->write_prot) |
| 2077 | return -EACCES; |
| 2078 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2079 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | |
| 2081 | /* Initialize write operation */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2082 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
| 2083 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2084 | ide_tape_discard_merge_buffer(drive, 1); |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2085 | if (tape->merge_bh || tape->merge_bh_size) { |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2086 | printk(KERN_ERR "ide-tape: merge_bh_size " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | "should be 0 now\n"); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2088 | tape->merge_bh_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | } |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2090 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); |
| 2091 | if (!tape->merge_bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | return -ENOMEM; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2093 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2094 | idetape_init_merge_buffer(tape); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | |
| 2096 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2097 | * Issue a write 0 command to ensure that DSC handshake is |
| 2098 | * switched from completion mode to buffer available mode. No |
| 2099 | * point in issuing this if DSC overlap isn't supported, some |
| 2100 | * drives (Seagate STT3401A) will return an error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | */ |
| 2102 | if (drive->dsc_overlap) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2103 | ssize_t retval = idetape_queue_rw_tail(drive, |
| 2104 | REQ_IDETAPE_WRITE, 0, |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2105 | tape->merge_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | if (retval < 0) { |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2107 | ide_tape_kfree_buffer(tape); |
| 2108 | tape->merge_bh = NULL; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2109 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | return retval; |
| 2111 | } |
| 2112 | } |
| 2113 | } |
| 2114 | if (count == 0) |
| 2115 | return (0); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2116 | if (tape->merge_bh_size) { |
| 2117 | if (tape->merge_bh_size >= tape->buffer_size) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2118 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2119 | tape->merge_bh_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2121 | actually_written = min((unsigned int) |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2122 | (tape->buffer_size - tape->merge_bh_size), |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2123 | (unsigned int)count); |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 2124 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2125 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | buf += actually_written; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2127 | tape->merge_bh_size += actually_written; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | count -= actually_written; |
| 2129 | |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2130 | if (tape->merge_bh_size == tape->buffer_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2131 | ssize_t retval; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2132 | tape->merge_bh_size = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2133 | retval = idetape_add_chrdev_write_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | if (retval <= 0) |
| 2135 | return (retval); |
| 2136 | } |
| 2137 | } |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2138 | while (count >= tape->buffer_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2139 | ssize_t retval; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2140 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2141 | ret = -EFAULT; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2142 | buf += tape->buffer_size; |
| 2143 | count -= tape->buffer_size; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2144 | retval = idetape_add_chrdev_write_request(drive, ctl); |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2145 | actually_written += tape->buffer_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | if (retval <= 0) |
| 2147 | return (retval); |
| 2148 | } |
| 2149 | if (count) { |
| 2150 | actually_written += count; |
Borislav Petkov | 8646c88 | 2008-04-27 15:38:26 +0200 | [diff] [blame] | 2151 | if (idetape_copy_stage_from_user(tape, buf, count)) |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2152 | ret = -EFAULT; |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2153 | tape->merge_bh_size += count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2155 | return ret ? ret : actually_written; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | } |
| 2157 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2158 | static int idetape_write_filemark(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | { |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2160 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | |
| 2162 | /* Write a filemark */ |
| 2163 | idetape_create_write_filemark_cmd(drive, &pc, 1); |
| 2164 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 2165 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
| 2166 | return -EIO; |
| 2167 | } |
| 2168 | return 0; |
| 2169 | } |
| 2170 | |
| 2171 | /* |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2172 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
| 2173 | * requested. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2175 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
| 2176 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also |
Borislav Petkov | 5bd50dc | 2008-04-27 15:38:28 +0200 | [diff] [blame] | 2177 | * usually not supported. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2179 | * The following commands are currently not supported: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2181 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
| 2182 | * MT_ST_WRITE_THRESHOLD. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | */ |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2184 | 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] | 2185 | { |
| 2186 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2187 | struct ide_atapi_pc pc; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2188 | int i, retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2190 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
| 2191 | mt_op, mt_count); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | switch (mt_op) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2194 | case MTFSF: |
| 2195 | case MTFSFM: |
| 2196 | case MTBSF: |
| 2197 | case MTBSFM: |
| 2198 | if (!mt_count) |
| 2199 | return 0; |
| 2200 | return idetape_space_over_filemarks(drive, mt_op, mt_count); |
| 2201 | default: |
| 2202 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | switch (mt_op) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2206 | case MTWEOF: |
| 2207 | if (tape->write_prot) |
| 2208 | return -EACCES; |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2209 | ide_tape_discard_merge_buffer(drive, 1); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2210 | for (i = 0; i < mt_count; i++) { |
| 2211 | retval = idetape_write_filemark(drive); |
| 2212 | if (retval) |
| 2213 | return retval; |
| 2214 | } |
| 2215 | return 0; |
| 2216 | case MTREW: |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2217 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2218 | if (idetape_rewind_tape(drive)) |
| 2219 | return -EIO; |
| 2220 | return 0; |
| 2221 | case MTLOAD: |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2222 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2223 | idetape_create_load_unload_cmd(drive, &pc, |
| 2224 | IDETAPE_LU_LOAD_MASK); |
| 2225 | return idetape_queue_pc_tail(drive, &pc); |
| 2226 | case MTUNLOAD: |
| 2227 | case MTOFFL: |
| 2228 | /* |
| 2229 | * If door is locked, attempt to unlock before |
| 2230 | * attempting to eject. |
| 2231 | */ |
| 2232 | if (tape->door_locked) { |
| 2233 | if (idetape_create_prevent_cmd(drive, &pc, 0)) |
| 2234 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 2235 | tape->door_locked = DOOR_UNLOCKED; |
| 2236 | } |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2237 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2238 | idetape_create_load_unload_cmd(drive, &pc, |
| 2239 | !IDETAPE_LU_LOAD_MASK); |
| 2240 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2241 | if (!retval) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2242 | clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2243 | return retval; |
| 2244 | case MTNOP: |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2245 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2246 | return idetape_flush_tape_buffers(drive); |
| 2247 | case MTRETEN: |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2248 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2249 | idetape_create_load_unload_cmd(drive, &pc, |
| 2250 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
| 2251 | return idetape_queue_pc_tail(drive, &pc); |
| 2252 | case MTEOM: |
| 2253 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); |
| 2254 | return idetape_queue_pc_tail(drive, &pc); |
| 2255 | case MTERASE: |
| 2256 | (void)idetape_rewind_tape(drive); |
| 2257 | idetape_create_erase_cmd(&pc); |
| 2258 | return idetape_queue_pc_tail(drive, &pc); |
| 2259 | case MTSETBLK: |
| 2260 | if (mt_count) { |
| 2261 | if (mt_count < tape->blk_size || |
| 2262 | mt_count % tape->blk_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | return -EIO; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2264 | tape->user_bs_factor = mt_count / tape->blk_size; |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2265 | clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2266 | } else |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2267 | set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2268 | return 0; |
| 2269 | case MTSEEK: |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2270 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2271 | return idetape_position_tape(drive, |
| 2272 | mt_count * tape->user_bs_factor, tape->partition, 0); |
| 2273 | case MTSETPART: |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2274 | ide_tape_discard_merge_buffer(drive, 0); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2275 | return idetape_position_tape(drive, 0, mt_count, 0); |
| 2276 | case MTFSR: |
| 2277 | case MTBSR: |
| 2278 | case MTLOCK: |
| 2279 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2280 | return 0; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2281 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2282 | if (retval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | return retval; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2284 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
| 2285 | return 0; |
| 2286 | case MTUNLOCK: |
| 2287 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | return 0; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2289 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2290 | if (retval) |
| 2291 | return retval; |
| 2292 | tape->door_locked = DOOR_UNLOCKED; |
| 2293 | return 0; |
| 2294 | default: |
| 2295 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
| 2296 | mt_op); |
| 2297 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | } |
| 2299 | } |
| 2300 | |
| 2301 | /* |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2302 | * Our character device ioctls. General mtio.h magnetic io commands are |
| 2303 | * supported here, and not in the corresponding block interface. Our own |
| 2304 | * ide-tape ioctls are supported on both interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | */ |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2306 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
| 2307 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | { |
| 2309 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2310 | ide_drive_t *drive = tape->drive; |
| 2311 | struct mtop mtop; |
| 2312 | struct mtget mtget; |
| 2313 | struct mtpos mtpos; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2314 | int block_offset = 0, position = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | void __user *argp = (void __user *)arg; |
| 2316 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2317 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2319 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
Borislav Petkov | d9df937 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2320 | ide_tape_flush_merge_buffer(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | idetape_flush_tape_buffers(drive); |
| 2322 | } |
| 2323 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2324 | block_offset = tape->merge_bh_size / |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2325 | (tape->blk_size * tape->user_bs_factor); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2326 | position = idetape_read_position(drive); |
| 2327 | if (position < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | return -EIO; |
| 2329 | } |
| 2330 | switch (cmd) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2331 | case MTIOCTOP: |
| 2332 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) |
| 2333 | return -EFAULT; |
| 2334 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); |
| 2335 | case MTIOCGET: |
| 2336 | memset(&mtget, 0, sizeof(struct mtget)); |
| 2337 | mtget.mt_type = MT_ISSCSI2; |
| 2338 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 2339 | mtget.mt_dsreg = |
| 2340 | ((tape->blk_size * tape->user_bs_factor) |
| 2341 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2342 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2343 | if (tape->drv_write_prot) |
| 2344 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); |
| 2345 | |
| 2346 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) |
| 2347 | return -EFAULT; |
| 2348 | return 0; |
| 2349 | case MTIOCPOS: |
| 2350 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 2351 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) |
| 2352 | return -EFAULT; |
| 2353 | return 0; |
| 2354 | default: |
| 2355 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2356 | ide_tape_discard_merge_buffer(drive, 1); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2357 | return idetape_blkdev_ioctl(drive, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | } |
| 2359 | } |
| 2360 | |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2361 | /* |
| 2362 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape |
| 2363 | * block size with the reported value. |
| 2364 | */ |
| 2365 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) |
| 2366 | { |
| 2367 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2368 | struct ide_atapi_pc pc; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2369 | |
| 2370 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); |
| 2371 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 2372 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2373 | if (tape->blk_size == 0) { |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2374 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
| 2375 | "block size, assuming 32k\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2376 | tape->blk_size = 32768; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2377 | } |
| 2378 | return; |
| 2379 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2380 | tape->blk_size = (pc.buf[4 + 5] << 16) + |
| 2381 | (pc.buf[4 + 6] << 8) + |
| 2382 | pc.buf[4 + 7]; |
| 2383 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2384 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2386 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | { |
| 2388 | unsigned int minor = iminor(inode), i = minor & ~0xc0; |
| 2389 | ide_drive_t *drive; |
| 2390 | idetape_tape_t *tape; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2391 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | int retval; |
| 2393 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2394 | if (i >= MAX_HWIFS * MAX_DRIVES) |
| 2395 | return -ENXIO; |
| 2396 | |
| 2397 | tape = ide_tape_chrdev_get(i); |
| 2398 | if (!tape) |
| 2399 | return -ENXIO; |
| 2400 | |
| 2401 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
| 2402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | /* |
| 2404 | * We really want to do nonseekable_open(inode, filp); here, but some |
| 2405 | * versions of tar incorrectly call lseek on tapes and bail out if that |
| 2406 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
| 2407 | */ |
| 2408 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
| 2409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | drive = tape->drive; |
| 2411 | |
| 2412 | filp->private_data = tape; |
| 2413 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2414 | if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | retval = -EBUSY; |
| 2416 | goto out_put_tape; |
| 2417 | } |
| 2418 | |
| 2419 | retval = idetape_wait_ready(drive, 60 * HZ); |
| 2420 | if (retval) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2421 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
| 2423 | goto out_put_tape; |
| 2424 | } |
| 2425 | |
| 2426 | idetape_read_position(drive); |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2427 | if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | (void)idetape_rewind_tape(drive); |
| 2429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | /* Read block size and write protect status from drive. */ |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2431 | ide_tape_get_bsize_from_bdesc(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2432 | |
| 2433 | /* Set write protect flag if device is opened as read-only. */ |
| 2434 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) |
| 2435 | tape->write_prot = 1; |
| 2436 | else |
| 2437 | tape->write_prot = tape->drv_write_prot; |
| 2438 | |
| 2439 | /* Make sure drive isn't write protected if user wants to write. */ |
| 2440 | if (tape->write_prot) { |
| 2441 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || |
| 2442 | (filp->f_flags & O_ACCMODE) == O_RDWR) { |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2443 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | retval = -EROFS; |
| 2445 | goto out_put_tape; |
| 2446 | } |
| 2447 | } |
| 2448 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2449 | /* Lock the tape drive door so user can't eject. */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2450 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
| 2452 | if (!idetape_queue_pc_tail(drive, &pc)) { |
| 2453 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
| 2454 | tape->door_locked = DOOR_LOCKED; |
| 2455 | } |
| 2456 | } |
| 2457 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | return 0; |
| 2459 | |
| 2460 | out_put_tape: |
| 2461 | ide_tape_put(tape); |
| 2462 | return retval; |
| 2463 | } |
| 2464 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2465 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2466 | { |
| 2467 | idetape_tape_t *tape = drive->driver_data; |
| 2468 | |
Borislav Petkov | d9df937 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2469 | ide_tape_flush_merge_buffer(drive); |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2470 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); |
| 2471 | if (tape->merge_bh != NULL) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2472 | idetape_pad_zeros(drive, tape->blk_size * |
| 2473 | (tape->user_bs_factor - 1)); |
Borislav Petkov | 077e3bd | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2474 | ide_tape_kfree_buffer(tape); |
| 2475 | tape->merge_bh = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | } |
| 2477 | idetape_write_filemark(drive); |
| 2478 | idetape_flush_tape_buffers(drive); |
| 2479 | idetape_flush_tape_buffers(drive); |
| 2480 | } |
| 2481 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2482 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | { |
| 2484 | struct ide_tape_obj *tape = ide_tape_f(filp); |
| 2485 | ide_drive_t *drive = tape->drive; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2486 | struct ide_atapi_pc pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | unsigned int minor = iminor(inode); |
| 2488 | |
| 2489 | lock_kernel(); |
| 2490 | tape = drive->driver_data; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2491 | |
| 2492 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2494 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2495 | idetape_write_release(drive, minor); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2496 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | if (minor < 128) |
Borislav Petkov | ec0fdb0 | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2498 | ide_tape_discard_merge_buffer(drive, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | } |
Borislav Petkov | f64eee7 | 2008-04-27 15:38:25 +0200 | [diff] [blame] | 2500 | |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2501 | if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | (void) idetape_rewind_tape(drive); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2503 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | if (tape->door_locked == DOOR_LOCKED) { |
| 2505 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { |
| 2506 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 2507 | tape->door_locked = DOOR_UNLOCKED; |
| 2508 | } |
| 2509 | } |
| 2510 | } |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2511 | clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | ide_tape_put(tape); |
| 2513 | unlock_kernel(); |
| 2514 | return 0; |
| 2515 | } |
| 2516 | |
| 2517 | /* |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2518 | * check the contents of the ATAPI IDENTIFY command results. We return: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2519 | * |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2520 | * 1 - If the tape can be supported by us, based on the information we have so |
| 2521 | * far. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2522 | * |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2523 | * 0 - If this tape driver is not currently supported by us. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | */ |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2525 | static int idetape_identify_device(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | { |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2527 | u8 gcw[2], protocol, device_type, removable, packet_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | |
| 2529 | if (drive->id_read == 0) |
| 2530 | return 1; |
| 2531 | |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2532 | *((unsigned short *) &gcw) = drive->id->config; |
| 2533 | |
| 2534 | protocol = (gcw[1] & 0xC0) >> 6; |
| 2535 | device_type = gcw[1] & 0x1F; |
| 2536 | removable = !!(gcw[0] & 0x80); |
| 2537 | packet_size = gcw[0] & 0x3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | /* Check that we can support this device */ |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2540 | if (protocol != 2) |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2541 | printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2542 | protocol); |
| 2543 | else if (device_type != 1) |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2544 | printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2545 | "to tape\n", device_type); |
| 2546 | else if (!removable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2548 | else if (packet_size != 0) { |
Borislav Petkov | 24d57f8 | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2549 | printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" |
| 2550 | " bytes\n", packet_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | } else |
| 2552 | return 1; |
| 2553 | return 0; |
| 2554 | } |
| 2555 | |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2556 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2557 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2558 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2559 | struct ide_atapi_pc pc; |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2560 | char fw_rev[6], vendor_id[10], product_id[18]; |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | idetape_create_inquiry_cmd(&pc); |
| 2563 | if (idetape_queue_pc_tail(drive, &pc)) { |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2564 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
| 2565 | tape->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2566 | return; |
| 2567 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2568 | memcpy(vendor_id, &pc.buf[8], 8); |
| 2569 | memcpy(product_id, &pc.buf[16], 16); |
| 2570 | memcpy(fw_rev, &pc.buf[32], 4); |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2571 | |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2572 | ide_fixstring(vendor_id, 10, 0); |
| 2573 | ide_fixstring(product_id, 18, 0); |
| 2574 | ide_fixstring(fw_rev, 6, 0); |
| 2575 | |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2576 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2577 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2578 | } |
| 2579 | |
| 2580 | /* |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2581 | * Ask the tape about its various parameters. In particular, we will adjust our |
| 2582 | * 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] | 2583 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2584 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2585 | { |
| 2586 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2587 | struct ide_atapi_pc pc; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2588 | u8 *caps; |
| 2589 | u8 speed, max_speed; |
Borislav Petkov | 47314fa | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
| 2592 | if (idetape_queue_pc_tail(drive, &pc)) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2593 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
| 2594 | " some default values\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2595 | tape->blk_size = 512; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2596 | put_unaligned(52, (u16 *)&tape->caps[12]); |
| 2597 | put_unaligned(540, (u16 *)&tape->caps[14]); |
| 2598 | put_unaligned(6*52, (u16 *)&tape->caps[16]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | return; |
| 2600 | } |
Borislav Petkov | d236d74 | 2008-04-18 00:46:27 +0200 | [diff] [blame] | 2601 | caps = pc.buf + 4 + pc.buf[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2602 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2603 | /* convert to host order and save for later use */ |
| 2604 | speed = be16_to_cpu(*(u16 *)&caps[14]); |
| 2605 | max_speed = be16_to_cpu(*(u16 *)&caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2606 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2607 | put_unaligned(max_speed, (u16 *)&caps[8]); |
| 2608 | put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); |
| 2609 | put_unaligned(speed, (u16 *)&caps[14]); |
| 2610 | put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); |
| 2611 | |
| 2612 | if (!speed) { |
| 2613 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " |
| 2614 | "(assuming 650KB/sec)\n", drive->name); |
| 2615 | put_unaligned(650, (u16 *)&caps[14]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2616 | } |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2617 | if (!max_speed) { |
| 2618 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " |
| 2619 | "(assuming 650KB/sec)\n", drive->name); |
| 2620 | put_unaligned(650, (u16 *)&caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | } |
| 2622 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2623 | memcpy(&tape->caps, caps, 20); |
| 2624 | if (caps[7] & 0x02) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2625 | tape->blk_size = 512; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2626 | else if (caps[7] & 0x04) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2627 | tape->blk_size = 1024; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | } |
| 2629 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2630 | #ifdef CONFIG_IDE_PROC_FS |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2631 | static void idetape_add_settings(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | { |
| 2633 | idetape_tape_t *tape = drive->driver_data; |
| 2634 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2635 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 2636 | 1, 2, (u16 *)&tape->caps[16], NULL); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2637 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 2638 | 1, 1, (u16 *)&tape->caps[14], NULL); |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2639 | ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff, |
| 2640 | 1, 1024, &tape->buffer_size, NULL); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2641 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
| 2642 | IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, |
| 2643 | NULL); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2644 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, |
| 2645 | 1, &drive->dsc_overlap, NULL); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2646 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, |
| 2647 | 1, 1, &tape->avg_speed, NULL); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2648 | ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
| 2649 | 1, &tape->debug_mask, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2650 | } |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2651 | #else |
| 2652 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } |
| 2653 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | |
| 2655 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2656 | * The function below is called to: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2658 | * 1. Initialize our various state variables. |
| 2659 | * 2. Ask the tape for its capabilities. |
| 2660 | * 3. Allocate a buffer which will be used for data transfer. The buffer size |
| 2661 | * is chosen based on the recommendation which we received in step 2. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2662 | * |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2663 | * Note that at this point ide.c already assigned us an irq, so that we can |
| 2664 | * queue requests here and wait for their completion. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | */ |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2666 | 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] | 2667 | { |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 2668 | unsigned long t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2669 | int speed; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2670 | int buffer_size; |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2671 | u8 gcw[2]; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2672 | u16 *ctl = (u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2674 | spin_lock_init(&tape->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | drive->dsc_overlap = 1; |
Bartlomiej Zolnierkiewicz | 4166c19 | 2008-02-01 23:09:30 +0100 | [diff] [blame] | 2676 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
| 2677 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", |
| 2678 | tape->name); |
| 2679 | drive->dsc_overlap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | /* Seagate Travan drives do not support DSC overlap. */ |
| 2682 | if (strstr(drive->id->model, "Seagate STT3401")) |
| 2683 | drive->dsc_overlap = 0; |
| 2684 | tape->minor = minor; |
| 2685 | tape->name[0] = 'h'; |
| 2686 | tape->name[1] = 't'; |
| 2687 | tape->name[2] = '0' + minor; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2688 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2689 | tape->pc = tape->pc_stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | *((unsigned short *) &gcw) = drive->id->config; |
Borislav Petkov | 71071b8 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2691 | |
| 2692 | /* Command packet DRQ type */ |
| 2693 | if (((gcw[0] & 0x60) >> 5) == 1) |
Borislav Petkov | 346331f | 2008-04-18 00:46:26 +0200 | [diff] [blame] | 2694 | set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | idetape_get_inquiry_results(drive); |
| 2697 | idetape_get_mode_sense_results(drive); |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2698 | ide_tape_get_bsize_from_bdesc(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2699 | tape->user_bs_factor = 1; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2700 | tape->buffer_size = *ctl * tape->blk_size; |
| 2701 | while (tape->buffer_size > 0xffff) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2703 | *ctl /= 2; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2704 | tape->buffer_size = *ctl * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2705 | } |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2706 | buffer_size = tape->buffer_size; |
Borislav Petkov | a997a43 | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2707 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2708 | if (buffer_size % PAGE_SIZE) { |
Borislav Petkov | a997a43 | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2709 | tape->pages_per_buffer++; |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2710 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | } |
| 2712 | |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 2713 | /* select the "best" DSC read/write polling freq */ |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2714 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2716 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2717 | |
| 2718 | /* |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2719 | * Ensure that the number we got makes sense; limit it within |
| 2720 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2721 | */ |
Harvey Harrison | a792bd5 | 2008-07-15 21:21:41 +0200 | [diff] [blame] | 2722 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
| 2723 | IDETAPE_DSC_RW_MAX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2724 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
Borislav Petkov | 83042b2 | 2008-04-27 15:38:27 +0200 | [diff] [blame] | 2725 | "%lums tDSC%s\n", |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2726 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
Borislav Petkov | f73850a | 2008-04-27 15:38:33 +0200 | [diff] [blame] | 2727 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
| 2728 | tape->buffer_size / 1024, |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2729 | tape->best_dsc_rw_freq * 1000 / HZ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | drive->using_dma ? ", DMA":""); |
| 2731 | |
| 2732 | idetape_add_settings(drive); |
| 2733 | } |
| 2734 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 2735 | static void ide_tape_remove(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2736 | { |
| 2737 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2738 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2739 | ide_proc_unregister_driver(drive, tape->driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2740 | |
| 2741 | ide_unregister_region(tape->disk); |
| 2742 | |
| 2743 | ide_tape_put(tape); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2744 | } |
| 2745 | |
| 2746 | static void ide_tape_release(struct kref *kref) |
| 2747 | { |
| 2748 | struct ide_tape_obj *tape = to_ide_tape(kref); |
| 2749 | ide_drive_t *drive = tape->drive; |
| 2750 | struct gendisk *g = tape->disk; |
| 2751 | |
Borislav Petkov | 01a63aeb | 2008-04-27 15:38:34 +0200 | [diff] [blame] | 2752 | BUG_ON(tape->merge_bh_size); |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | drive->dsc_overlap = 0; |
| 2755 | drive->driver_data = NULL; |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 2756 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2757 | device_destroy(idetape_sysfs_class, |
| 2758 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | idetape_devs[tape->minor] = NULL; |
| 2760 | g->private_data = NULL; |
| 2761 | put_disk(g); |
| 2762 | kfree(tape); |
| 2763 | } |
| 2764 | |
Bartlomiej Zolnierkiewicz | ecfd80e | 2007-05-10 00:01:09 +0200 | [diff] [blame] | 2765 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | static int proc_idetape_read_name |
| 2767 | (char *page, char **start, off_t off, int count, int *eof, void *data) |
| 2768 | { |
| 2769 | ide_drive_t *drive = (ide_drive_t *) data; |
| 2770 | idetape_tape_t *tape = drive->driver_data; |
| 2771 | char *out = page; |
| 2772 | int len; |
| 2773 | |
| 2774 | len = sprintf(out, "%s\n", tape->name); |
| 2775 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); |
| 2776 | } |
| 2777 | |
| 2778 | static ide_proc_entry_t idetape_proc[] = { |
| 2779 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, |
| 2780 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, |
| 2781 | { NULL, 0, NULL, NULL } |
| 2782 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | #endif |
| 2784 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 2785 | static int ide_tape_probe(ide_drive_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | static ide_driver_t idetape_driver = { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2788 | .gen_driver = { |
Laurent Riffard | 4ef3b8f | 2005-11-18 22:15:40 +0100 | [diff] [blame] | 2789 | .owner = THIS_MODULE, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2790 | .name = "ide-tape", |
| 2791 | .bus = &ide_bus_type, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2792 | }, |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 2793 | .probe = ide_tape_probe, |
| 2794 | .remove = ide_tape_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2795 | .version = IDETAPE_VERSION, |
| 2796 | .media = ide_tape, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | .supports_dsc_overlap = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2798 | .do_request = idetape_do_request, |
| 2799 | .end_request = idetape_end_request, |
| 2800 | .error = __ide_error, |
| 2801 | .abort = __ide_abort, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2802 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | .proc = idetape_proc, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2804 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | }; |
| 2806 | |
Borislav Petkov | 3c98bf3 | 2008-02-06 02:57:53 +0100 | [diff] [blame] | 2807 | /* Our character device supporting functions, passed to register_chrdev. */ |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 2808 | static const struct file_operations idetape_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | .owner = THIS_MODULE, |
| 2810 | .read = idetape_chrdev_read, |
| 2811 | .write = idetape_chrdev_write, |
| 2812 | .ioctl = idetape_chrdev_ioctl, |
| 2813 | .open = idetape_chrdev_open, |
| 2814 | .release = idetape_chrdev_release, |
| 2815 | }; |
| 2816 | |
| 2817 | static int idetape_open(struct inode *inode, struct file *filp) |
| 2818 | { |
| 2819 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 2820 | struct ide_tape_obj *tape; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2821 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2822 | tape = ide_tape_get(disk); |
| 2823 | if (!tape) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | return -ENXIO; |
| 2825 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2826 | return 0; |
| 2827 | } |
| 2828 | |
| 2829 | static int idetape_release(struct inode *inode, struct file *filp) |
| 2830 | { |
| 2831 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 2832 | struct ide_tape_obj *tape = ide_tape_g(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | |
| 2834 | ide_tape_put(tape); |
| 2835 | |
| 2836 | return 0; |
| 2837 | } |
| 2838 | |
| 2839 | static int idetape_ioctl(struct inode *inode, struct file *file, |
| 2840 | unsigned int cmd, unsigned long arg) |
| 2841 | { |
| 2842 | struct block_device *bdev = inode->i_bdev; |
| 2843 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); |
| 2844 | ide_drive_t *drive = tape->drive; |
| 2845 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); |
| 2846 | if (err == -EINVAL) |
| 2847 | err = idetape_blkdev_ioctl(drive, cmd, arg); |
| 2848 | return err; |
| 2849 | } |
| 2850 | |
| 2851 | static struct block_device_operations idetape_block_ops = { |
| 2852 | .owner = THIS_MODULE, |
| 2853 | .open = idetape_open, |
| 2854 | .release = idetape_release, |
| 2855 | .ioctl = idetape_ioctl, |
| 2856 | }; |
| 2857 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 2858 | static int ide_tape_probe(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2859 | { |
| 2860 | idetape_tape_t *tape; |
| 2861 | struct gendisk *g; |
| 2862 | int minor; |
| 2863 | |
| 2864 | if (!strstr("ide-tape", drive->driver_req)) |
| 2865 | goto failed; |
| 2866 | if (!drive->present) |
| 2867 | goto failed; |
| 2868 | if (drive->media != ide_tape) |
| 2869 | goto failed; |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2870 | if (!idetape_identify_device(drive)) { |
| 2871 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
| 2872 | " the driver\n", drive->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | goto failed; |
| 2874 | } |
| 2875 | if (drive->scsi) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2876 | printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi" |
| 2877 | " emulation.\n", drive->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2878 | goto failed; |
| 2879 | } |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2880 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2881 | if (tape == NULL) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2882 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
| 2883 | drive->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2884 | goto failed; |
| 2885 | } |
| 2886 | |
| 2887 | g = alloc_disk(1 << PARTN_BITS); |
| 2888 | if (!g) |
| 2889 | goto out_free_tape; |
| 2890 | |
| 2891 | ide_init_disk(g, drive); |
| 2892 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 2893 | ide_proc_register_driver(drive, &idetape_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | kref_init(&tape->kref); |
| 2896 | |
| 2897 | tape->drive = drive; |
| 2898 | tape->driver = &idetape_driver; |
| 2899 | tape->disk = g; |
| 2900 | |
| 2901 | g->private_data = &tape->driver; |
| 2902 | |
| 2903 | drive->driver_data = tape; |
| 2904 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 2905 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2906 | for (minor = 0; idetape_devs[minor]; minor++) |
| 2907 | ; |
| 2908 | idetape_devs[minor] = tape; |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 2909 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2910 | |
| 2911 | idetape_setup(drive, tape, minor); |
| 2912 | |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 2913 | device_create(idetape_sysfs_class, &drive->gendev, |
| 2914 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); |
| 2915 | device_create(idetape_sysfs_class, &drive->gendev, |
| 2916 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 2917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2918 | g->fops = &idetape_block_ops; |
| 2919 | ide_register_region(g); |
| 2920 | |
| 2921 | return 0; |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2923 | out_free_tape: |
| 2924 | kfree(tape); |
| 2925 | failed: |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2926 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2927 | } |
| 2928 | |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2929 | static void __exit idetape_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2930 | { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 2931 | driver_unregister(&idetape_driver.gen_driver); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 2932 | class_destroy(idetape_sysfs_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2933 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
| 2934 | } |
| 2935 | |
Bartlomiej Zolnierkiewicz | 17514e8 | 2005-11-19 22:24:35 +0100 | [diff] [blame] | 2936 | static int __init idetape_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2937 | { |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 2938 | int error = 1; |
| 2939 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); |
| 2940 | if (IS_ERR(idetape_sysfs_class)) { |
| 2941 | idetape_sysfs_class = NULL; |
| 2942 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); |
| 2943 | error = -EBUSY; |
| 2944 | goto out; |
| 2945 | } |
| 2946 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2947 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
Borislav Petkov | 5a04cfa | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2948 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
| 2949 | " interface\n"); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 2950 | error = -EBUSY; |
| 2951 | goto out_free_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2952 | } |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 2953 | |
| 2954 | error = driver_register(&idetape_driver.gen_driver); |
| 2955 | if (error) |
| 2956 | goto out_free_driver; |
| 2957 | |
| 2958 | return 0; |
| 2959 | |
| 2960 | out_free_driver: |
| 2961 | driver_unregister(&idetape_driver.gen_driver); |
| 2962 | out_free_class: |
| 2963 | class_destroy(idetape_sysfs_class); |
| 2964 | out: |
| 2965 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2966 | } |
| 2967 | |
Kay Sievers | 263756e | 2005-12-12 18:03:44 +0100 | [diff] [blame] | 2968 | MODULE_ALIAS("ide:*m-tape*"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2969 | module_init(idetape_init); |
| 2970 | module_exit(idetape_exit); |
| 2971 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |
Borislav Petkov | 9c14576 | 2008-02-06 02:57:54 +0100 | [diff] [blame] | 2972 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
| 2973 | MODULE_LICENSE("GPL"); |