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 | |
| 18 | #define IDETAPE_VERSION "1.19" |
| 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> |
| 42 | #include <asm/irq.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/mtio.h> |
| 47 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 48 | enum { |
| 49 | /* output errors only */ |
| 50 | DBG_ERR = (1 << 0), |
| 51 | /* output all sense key/asc */ |
| 52 | DBG_SENSE = (1 << 1), |
| 53 | /* info regarding all chrdev-related procedures */ |
| 54 | DBG_CHRDEV = (1 << 2), |
| 55 | /* all remaining procedures */ |
| 56 | DBG_PROCS = (1 << 3), |
| 57 | /* buffer alloc info (pc_stack & rq_stack) */ |
| 58 | DBG_PCRQ_STACK = (1 << 4), |
| 59 | }; |
| 60 | |
| 61 | /* define to see debug info */ |
| 62 | #define IDETAPE_DEBUG_LOG 0 |
| 63 | |
| 64 | #if IDETAPE_DEBUG_LOG |
| 65 | #define debug_log(lvl, fmt, args...) \ |
| 66 | { \ |
| 67 | if (tape->debug_mask & lvl) \ |
| 68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ |
| 69 | } |
| 70 | #else |
| 71 | #define debug_log(lvl, fmt, args...) do {} while (0) |
| 72 | #endif |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | /**************************** Tunable parameters *****************************/ |
| 75 | |
| 76 | |
| 77 | /* |
| 78 | * Pipelined mode parameters. |
| 79 | * |
| 80 | * We try to use the minimum number of stages which is enough to |
| 81 | * keep the tape constantly streaming. To accomplish that, we implement |
| 82 | * a feedback loop around the maximum number of stages: |
| 83 | * |
| 84 | * We start from MIN maximum stages (we will not even use MIN stages |
| 85 | * if we don't need them), increment it by RATE*(MAX-MIN) |
| 86 | * whenever we sense that the pipeline is empty, until we reach |
| 87 | * the optimum value or until we reach MAX. |
| 88 | * |
| 89 | * Setting the following parameter to 0 is illegal: the pipelined mode |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 90 | * cannot be disabled (idetape_calculate_speeds() divides by |
| 91 | * tape->max_stages.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | */ |
| 93 | #define IDETAPE_MIN_PIPELINE_STAGES 1 |
| 94 | #define IDETAPE_MAX_PIPELINE_STAGES 400 |
| 95 | #define IDETAPE_INCREASE_STAGES_RATE 20 |
| 96 | |
| 97 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | * After each failed packet command we issue a request sense command |
| 99 | * and retry the packet command IDETAPE_MAX_PC_RETRIES times. |
| 100 | * |
| 101 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
| 102 | */ |
| 103 | #define IDETAPE_MAX_PC_RETRIES 3 |
| 104 | |
| 105 | /* |
| 106 | * With each packet command, we allocate a buffer of |
| 107 | * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet |
| 108 | * commands (Not for READ/WRITE commands). |
| 109 | */ |
| 110 | #define IDETAPE_PC_BUFFER_SIZE 256 |
| 111 | |
| 112 | /* |
| 113 | * In various places in the driver, we need to allocate storage |
| 114 | * for packet commands and requests, which will remain valid while |
| 115 | * we leave the driver to wait for an interrupt or a timeout event. |
| 116 | */ |
| 117 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) |
| 118 | |
| 119 | /* |
| 120 | * Some drives (for example, Seagate STT3401A Travan) require a very long |
| 121 | * timeout, because they don't return an interrupt or clear their busy bit |
| 122 | * until after the command completes (even retension commands). |
| 123 | */ |
| 124 | #define IDETAPE_WAIT_CMD (900*HZ) |
| 125 | |
| 126 | /* |
| 127 | * The following parameter is used to select the point in the internal |
| 128 | * tape fifo in which we will start to refill the buffer. Decreasing |
| 129 | * the following parameter will improve the system's latency and |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 130 | * interactive response, while using a high value might improve system |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | * throughput. |
| 132 | */ |
| 133 | #define IDETAPE_FIFO_THRESHOLD 2 |
| 134 | |
| 135 | /* |
| 136 | * DSC polling parameters. |
| 137 | * |
| 138 | * Polling for DSC (a single bit in the status register) is a very |
| 139 | * important function in ide-tape. There are two cases in which we |
| 140 | * poll for DSC: |
| 141 | * |
| 142 | * 1. Before a read/write packet command, to ensure that we |
| 143 | * can transfer data from/to the tape's data buffers, without |
| 144 | * causing an actual media access. In case the tape is not |
| 145 | * ready yet, we take out our request from the device |
| 146 | * request queue, so that ide.c will service requests from |
| 147 | * the other device on the same interface meanwhile. |
| 148 | * |
| 149 | * 2. After the successful initialization of a "media access |
| 150 | * packet command", which is a command which can take a long |
| 151 | * time to complete (it can be several seconds or even an hour). |
| 152 | * |
| 153 | * Again, we postpone our request in the middle to free the bus |
| 154 | * for the other device. The polling frequency here should be |
| 155 | * lower than the read/write frequency since those media access |
| 156 | * commands are slow. We start from a "fast" frequency - |
| 157 | * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC |
| 158 | * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a |
| 159 | * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). |
| 160 | * |
| 161 | * We also set a timeout for the timer, in case something goes wrong. |
| 162 | * The timeout should be longer then the maximum execution time of a |
| 163 | * tape operation. |
| 164 | */ |
| 165 | |
| 166 | /* |
| 167 | * DSC timings. |
| 168 | */ |
| 169 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
| 170 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
| 171 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
| 172 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
| 173 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
| 174 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
| 175 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
| 176 | |
| 177 | /*************************** End of tunable parameters ***********************/ |
| 178 | |
| 179 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | * Read/Write error simulation |
| 181 | */ |
| 182 | #define SIMULATE_ERRORS 0 |
| 183 | |
| 184 | /* |
| 185 | * For general magnetic tape device compatibility. |
| 186 | */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 187 | |
| 188 | /* tape directions */ |
| 189 | enum { |
| 190 | IDETAPE_DIR_NONE = (1 << 0), |
| 191 | IDETAPE_DIR_READ = (1 << 1), |
| 192 | IDETAPE_DIR_WRITE = (1 << 2), |
| 193 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | struct idetape_bh { |
Stephen Rothwell | ab05796 | 2007-08-01 23:46:44 +0200 | [diff] [blame] | 196 | u32 b_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | atomic_t b_count; |
| 198 | struct idetape_bh *b_reqnext; |
| 199 | char *b_data; |
| 200 | }; |
| 201 | |
| 202 | /* |
| 203 | * Our view of a packet command. |
| 204 | */ |
| 205 | typedef struct idetape_packet_command_s { |
| 206 | u8 c[12]; /* Actual packet bytes */ |
| 207 | int retries; /* On each retry, we increment retries */ |
| 208 | int error; /* Error code */ |
| 209 | int request_transfer; /* Bytes to transfer */ |
| 210 | int actually_transferred; /* Bytes actually transferred */ |
| 211 | int buffer_size; /* Size of our data buffer */ |
| 212 | struct idetape_bh *bh; |
| 213 | char *b_data; |
| 214 | int b_count; |
| 215 | u8 *buffer; /* Data buffer */ |
| 216 | u8 *current_position; /* Pointer into the above buffer */ |
| 217 | ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ |
| 218 | u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ |
| 219 | unsigned long flags; /* Status/Action bit flags: long for set_bit */ |
| 220 | } idetape_pc_t; |
| 221 | |
| 222 | /* |
| 223 | * Packet command flag bits. |
| 224 | */ |
| 225 | /* Set when an error is considered normal - We won't retry */ |
| 226 | #define PC_ABORT 0 |
| 227 | /* 1 When polling for DSC on a media access command */ |
| 228 | #define PC_WAIT_FOR_DSC 1 |
| 229 | /* 1 when we prefer to use DMA if possible */ |
| 230 | #define PC_DMA_RECOMMENDED 2 |
| 231 | /* 1 while DMA in progress */ |
| 232 | #define PC_DMA_IN_PROGRESS 3 |
| 233 | /* 1 when encountered problem during DMA */ |
| 234 | #define PC_DMA_ERROR 4 |
| 235 | /* Data direction */ |
| 236 | #define PC_WRITING 5 |
| 237 | |
| 238 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | * A pipeline stage. |
| 240 | */ |
| 241 | typedef struct idetape_stage_s { |
| 242 | struct request rq; /* The corresponding request */ |
| 243 | struct idetape_bh *bh; /* The data buffers */ |
| 244 | struct idetape_stage_s *next; /* Pointer to the next stage */ |
| 245 | } idetape_stage_t; |
| 246 | |
| 247 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | * Most of our global data which we need to save even as we leave the |
| 249 | * driver due to an interrupt or a timer event is stored in a variable |
| 250 | * of type idetape_tape_t, defined below. |
| 251 | */ |
| 252 | typedef struct ide_tape_obj { |
| 253 | ide_drive_t *drive; |
| 254 | ide_driver_t *driver; |
| 255 | struct gendisk *disk; |
| 256 | struct kref kref; |
| 257 | |
| 258 | /* |
| 259 | * Since a typical character device operation requires more |
| 260 | * than one packet command, we provide here enough memory |
| 261 | * for the maximum of interconnected packet commands. |
| 262 | * The packet commands are stored in the circular array pc_stack. |
| 263 | * pc_stack_index points to the last used entry, and warps around |
| 264 | * to the start when we get to the last array entry. |
| 265 | * |
| 266 | * pc points to the current processed packet command. |
| 267 | * |
| 268 | * failed_pc points to the last failed packet command, or contains |
| 269 | * NULL if we do not need to retry any packet command. This is |
| 270 | * required since an additional packet command is needed before the |
| 271 | * retry, to get detailed information on what went wrong. |
| 272 | */ |
| 273 | /* Current packet command */ |
| 274 | idetape_pc_t *pc; |
| 275 | /* Last failed packet command */ |
| 276 | idetape_pc_t *failed_pc; |
| 277 | /* Packet command stack */ |
| 278 | idetape_pc_t pc_stack[IDETAPE_PC_STACK]; |
| 279 | /* Next free packet command storage space */ |
| 280 | int pc_stack_index; |
| 281 | struct request rq_stack[IDETAPE_PC_STACK]; |
| 282 | /* We implement a circular array */ |
| 283 | int rq_stack_index; |
| 284 | |
| 285 | /* |
| 286 | * DSC polling variables. |
| 287 | * |
| 288 | * While polling for DSC we use postponed_rq to postpone the |
| 289 | * current request so that ide.c will be able to service |
| 290 | * pending requests on the other device. Note that at most |
| 291 | * we will have only one DSC (usually data transfer) request |
| 292 | * in the device request queue. Additional requests can be |
| 293 | * queued in our internal pipeline, but they will be visible |
| 294 | * to ide.c only one at a time. |
| 295 | */ |
| 296 | struct request *postponed_rq; |
| 297 | /* The time in which we started polling for DSC */ |
| 298 | unsigned long dsc_polling_start; |
| 299 | /* Timer used to poll for dsc */ |
| 300 | struct timer_list dsc_timer; |
| 301 | /* Read/Write dsc polling frequency */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 302 | unsigned long best_dsc_rw_freq; |
| 303 | unsigned long dsc_poll_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | unsigned long dsc_timeout; |
| 305 | |
| 306 | /* |
| 307 | * Read position information |
| 308 | */ |
| 309 | u8 partition; |
| 310 | /* Current block */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 311 | unsigned int first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
| 313 | /* |
| 314 | * Last error information |
| 315 | */ |
| 316 | u8 sense_key, asc, ascq; |
| 317 | |
| 318 | /* |
| 319 | * Character device operation |
| 320 | */ |
| 321 | unsigned int minor; |
| 322 | /* device name */ |
| 323 | char name[4]; |
| 324 | /* Current character device data transfer direction */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 325 | u8 chrdev_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 327 | /* tape block size, usually 512 or 1024 bytes */ |
| 328 | unsigned short blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | int user_bs_factor; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | /* Copy of the tape's Capabilities and Mechanical Page */ |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 332 | u8 caps[20]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | /* |
| 335 | * Active data transfer request parameters. |
| 336 | * |
| 337 | * At most, there is only one ide-tape originated data transfer |
| 338 | * request in the device request queue. This allows ide.c to |
| 339 | * easily service requests from the other device when we |
| 340 | * postpone our active request. In the pipelined operation |
| 341 | * mode, we use our internal pipeline structure to hold |
| 342 | * more data requests. |
| 343 | * |
| 344 | * The data buffer size is chosen based on the tape's |
| 345 | * recommendation. |
| 346 | */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 347 | /* Ptr to the request which is waiting in the device request queue */ |
| 348 | struct request *active_data_rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | /* Data buffer size (chosen based on the tape's recommendation */ |
| 350 | int stage_size; |
| 351 | idetape_stage_t *merge_stage; |
| 352 | int merge_stage_size; |
| 353 | struct idetape_bh *bh; |
| 354 | char *b_data; |
| 355 | int b_count; |
| 356 | |
| 357 | /* |
| 358 | * Pipeline parameters. |
| 359 | * |
| 360 | * To accomplish non-pipelined mode, we simply set the following |
| 361 | * variables to zero (or NULL, where appropriate). |
| 362 | */ |
| 363 | /* Number of currently used stages */ |
| 364 | int nr_stages; |
| 365 | /* Number of pending stages */ |
| 366 | int nr_pending_stages; |
| 367 | /* We will not allocate more than this number of stages */ |
| 368 | int max_stages, min_pipeline, max_pipeline; |
| 369 | /* The first stage which will be removed from the pipeline */ |
| 370 | idetape_stage_t *first_stage; |
| 371 | /* The currently active stage */ |
| 372 | idetape_stage_t *active_stage; |
| 373 | /* Will be serviced after the currently active request */ |
| 374 | idetape_stage_t *next_stage; |
| 375 | /* New requests will be added to the pipeline here */ |
| 376 | idetape_stage_t *last_stage; |
| 377 | /* Optional free stage which we can use */ |
| 378 | idetape_stage_t *cache_stage; |
| 379 | int pages_per_stage; |
| 380 | /* Wasted space in each stage */ |
| 381 | int excess_bh_size; |
| 382 | |
| 383 | /* Status/Action flags: long for set_bit */ |
| 384 | unsigned long flags; |
| 385 | /* protects the ide-tape queue */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 386 | spinlock_t lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | /* |
| 389 | * Measures average tape speed |
| 390 | */ |
| 391 | unsigned long avg_time; |
| 392 | int avg_size; |
| 393 | int avg_speed; |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | /* the door is currently locked */ |
| 396 | int door_locked; |
| 397 | /* the tape hardware is write protected */ |
| 398 | char drv_write_prot; |
| 399 | /* the tape is write protected (hardware or opened as read-only) */ |
| 400 | char write_prot; |
| 401 | |
| 402 | /* |
| 403 | * Limit the number of times a request can |
| 404 | * be postponed, to avoid an infinite postpone |
| 405 | * deadlock. |
| 406 | */ |
| 407 | /* request postpone count limit */ |
| 408 | int postpone_cnt; |
| 409 | |
| 410 | /* |
| 411 | * Measures number of frames: |
| 412 | * |
| 413 | * 1. written/read to/from the driver pipeline (pipeline_head). |
| 414 | * 2. written/read to/from the tape buffers (idetape_bh). |
| 415 | * 3. written/read by the tape to/from the media (tape_head). |
| 416 | */ |
| 417 | int pipeline_head; |
| 418 | int buffer_head; |
| 419 | int tape_head; |
| 420 | int last_tape_head; |
| 421 | |
| 422 | /* |
| 423 | * Speed control at the tape buffers input/output |
| 424 | */ |
| 425 | unsigned long insert_time; |
| 426 | int insert_size; |
| 427 | int insert_speed; |
| 428 | int max_insert_speed; |
| 429 | int measure_insert_time; |
| 430 | |
| 431 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | * Speed regulation negative feedback loop |
| 433 | */ |
| 434 | int speed_control; |
| 435 | int pipeline_head_speed; |
| 436 | int controlled_pipeline_head_speed; |
| 437 | int uncontrolled_pipeline_head_speed; |
| 438 | int controlled_last_pipeline_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | unsigned long uncontrolled_pipeline_head_time; |
| 440 | unsigned long controlled_pipeline_head_time; |
| 441 | int controlled_previous_pipeline_head; |
| 442 | int uncontrolled_previous_pipeline_head; |
| 443 | unsigned long controlled_previous_head_time; |
| 444 | unsigned long uncontrolled_previous_head_time; |
| 445 | int restart_speed_control_req; |
| 446 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 447 | u32 debug_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } idetape_tape_t; |
| 449 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 450 | static DEFINE_MUTEX(idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 452 | static struct class *idetape_sysfs_class; |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
| 455 | |
| 456 | #define ide_tape_g(disk) \ |
| 457 | container_of((disk)->private_data, struct ide_tape_obj, driver) |
| 458 | |
| 459 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
| 460 | { |
| 461 | struct ide_tape_obj *tape = NULL; |
| 462 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 463 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | tape = ide_tape_g(disk); |
| 465 | if (tape) |
| 466 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 467 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | return tape; |
| 469 | } |
| 470 | |
| 471 | static void ide_tape_release(struct kref *); |
| 472 | |
| 473 | static void ide_tape_put(struct ide_tape_obj *tape) |
| 474 | { |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 475 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | kref_put(&tape->kref, ide_tape_release); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 477 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Tape door status |
| 482 | */ |
| 483 | #define DOOR_UNLOCKED 0 |
| 484 | #define DOOR_LOCKED 1 |
| 485 | #define DOOR_EXPLICITLY_LOCKED 2 |
| 486 | |
| 487 | /* |
| 488 | * Tape flag bits values. |
| 489 | */ |
| 490 | #define IDETAPE_IGNORE_DSC 0 |
| 491 | #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ |
| 492 | #define IDETAPE_BUSY 2 /* Device already opened */ |
| 493 | #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ |
| 494 | #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ |
| 495 | #define IDETAPE_FILEMARK 5 /* Currently on a filemark */ |
| 496 | #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ |
| 497 | #define IDETAPE_READ_ERROR 7 |
| 498 | #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ |
| 499 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
| 500 | #define IDETAPE_MEDIUM_PRESENT 9 |
| 501 | |
| 502 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | * Some defines for the READ BUFFER command |
| 504 | */ |
| 505 | #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 |
| 506 | |
| 507 | /* |
| 508 | * Some defines for the SPACE command |
| 509 | */ |
| 510 | #define IDETAPE_SPACE_OVER_FILEMARK 1 |
| 511 | #define IDETAPE_SPACE_TO_EOD 3 |
| 512 | |
| 513 | /* |
| 514 | * Some defines for the LOAD UNLOAD command |
| 515 | */ |
| 516 | #define IDETAPE_LU_LOAD_MASK 1 |
| 517 | #define IDETAPE_LU_RETENSION_MASK 2 |
| 518 | #define IDETAPE_LU_EOT_MASK 4 |
| 519 | |
| 520 | /* |
| 521 | * Special requests for our block device strategy routine. |
| 522 | * |
| 523 | * In order to service a character device command, we add special |
| 524 | * requests to the tail of our block device request queue and wait |
| 525 | * for their completion. |
| 526 | */ |
| 527 | |
| 528 | enum { |
| 529 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ |
| 530 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ |
| 531 | REQ_IDETAPE_READ = (1 << 2), |
| 532 | REQ_IDETAPE_WRITE = (1 << 3), |
| 533 | REQ_IDETAPE_READ_BUFFER = (1 << 4), |
| 534 | }; |
| 535 | |
| 536 | /* |
| 537 | * Error codes which are returned in rq->errors to the higher part |
| 538 | * of the driver. |
| 539 | */ |
| 540 | #define IDETAPE_ERROR_GENERAL 101 |
| 541 | #define IDETAPE_ERROR_FILEMARK 102 |
| 542 | #define IDETAPE_ERROR_EOD 103 |
| 543 | |
| 544 | /* |
| 545 | * The following is used to format the general configuration word of |
| 546 | * the ATAPI IDENTIFY DEVICE command. |
| 547 | */ |
| 548 | struct idetape_id_gcw { |
| 549 | unsigned packet_size :2; /* Packet Size */ |
| 550 | unsigned reserved234 :3; /* Reserved */ |
| 551 | unsigned drq_type :2; /* Command packet DRQ type */ |
| 552 | unsigned removable :1; /* Removable media */ |
| 553 | unsigned device_type :5; /* Device type */ |
| 554 | unsigned reserved13 :1; /* Reserved */ |
| 555 | unsigned protocol :2; /* Protocol type */ |
| 556 | }; |
| 557 | |
Borislav Petkov | fa36625 | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 558 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | #define IDETAPE_BLOCK_DESCRIPTOR 0 |
| 560 | #define IDETAPE_CAPABILITIES_PAGE 0x2a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | * The variables below are used for the character device interface. |
| 564 | * Additional state variables are defined in our ide_drive_t structure. |
| 565 | */ |
| 566 | static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
| 567 | |
| 568 | #define ide_tape_f(file) ((file)->private_data) |
| 569 | |
| 570 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
| 571 | { |
| 572 | struct ide_tape_obj *tape = NULL; |
| 573 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 574 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | tape = idetape_devs[i]; |
| 576 | if (tape) |
| 577 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 578 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return tape; |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * Function declarations |
| 584 | * |
| 585 | */ |
| 586 | static int idetape_chrdev_release (struct inode *inode, struct file *filp); |
| 587 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor); |
| 588 | |
| 589 | /* |
| 590 | * Too bad. The drive wants to send us data which we are not ready to accept. |
| 591 | * Just throw it away. |
| 592 | */ |
| 593 | static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) |
| 594 | { |
| 595 | while (bcount--) |
| 596 | (void) HWIF(drive)->INB(IDE_DATA_REG); |
| 597 | } |
| 598 | |
| 599 | static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) |
| 600 | { |
| 601 | struct idetape_bh *bh = pc->bh; |
| 602 | int count; |
| 603 | |
| 604 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | if (bh == NULL) { |
| 606 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 607 | "idetape_input_buffers\n"); |
| 608 | idetape_discard_data(drive, bcount); |
| 609 | return; |
| 610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); |
| 612 | HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); |
| 613 | bcount -= count; |
| 614 | atomic_add(count, &bh->b_count); |
| 615 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 616 | bh = bh->b_reqnext; |
| 617 | if (bh) |
| 618 | atomic_set(&bh->b_count, 0); |
| 619 | } |
| 620 | } |
| 621 | pc->bh = bh; |
| 622 | } |
| 623 | |
| 624 | static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) |
| 625 | { |
| 626 | struct idetape_bh *bh = pc->bh; |
| 627 | int count; |
| 628 | |
| 629 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | if (bh == NULL) { |
| 631 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 632 | "idetape_output_buffers\n"); |
| 633 | return; |
| 634 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
| 636 | HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); |
| 637 | bcount -= count; |
| 638 | pc->b_data += count; |
| 639 | pc->b_count -= count; |
| 640 | if (!pc->b_count) { |
| 641 | pc->bh = bh = bh->b_reqnext; |
| 642 | if (bh) { |
| 643 | pc->b_data = bh->b_data; |
| 644 | pc->b_count = atomic_read(&bh->b_count); |
| 645 | } |
| 646 | } |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | static void idetape_update_buffers (idetape_pc_t *pc) |
| 651 | { |
| 652 | struct idetape_bh *bh = pc->bh; |
| 653 | int count; |
| 654 | unsigned int bcount = pc->actually_transferred; |
| 655 | |
| 656 | if (test_bit(PC_WRITING, &pc->flags)) |
| 657 | return; |
| 658 | while (bcount) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | if (bh == NULL) { |
| 660 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 661 | "idetape_update_buffers\n"); |
| 662 | return; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
| 665 | atomic_set(&bh->b_count, count); |
| 666 | if (atomic_read(&bh->b_count) == bh->b_size) |
| 667 | bh = bh->b_reqnext; |
| 668 | bcount -= count; |
| 669 | } |
| 670 | pc->bh = bh; |
| 671 | } |
| 672 | |
| 673 | /* |
| 674 | * idetape_next_pc_storage returns a pointer to a place in which we can |
| 675 | * safely store a packet command, even though we intend to leave the |
| 676 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet |
| 677 | * commands is allocated at initialization time. |
| 678 | */ |
| 679 | static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) |
| 680 | { |
| 681 | idetape_tape_t *tape = drive->driver_data; |
| 682 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 683 | debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
| 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
| 686 | tape->pc_stack_index=0; |
| 687 | return (&tape->pc_stack[tape->pc_stack_index++]); |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. |
| 692 | * Since we queue packet commands in the request queue, we need to |
| 693 | * allocate a request, along with the allocation of a packet command. |
| 694 | */ |
| 695 | |
| 696 | /************************************************************** |
| 697 | * * |
| 698 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * |
| 699 | * followed later on by kfree(). -ml * |
| 700 | * * |
| 701 | **************************************************************/ |
| 702 | |
| 703 | static struct request *idetape_next_rq_storage (ide_drive_t *drive) |
| 704 | { |
| 705 | idetape_tape_t *tape = drive->driver_data; |
| 706 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 707 | debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
| 708 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
| 710 | tape->rq_stack_index=0; |
| 711 | return (&tape->rq_stack[tape->rq_stack_index++]); |
| 712 | } |
| 713 | |
| 714 | /* |
| 715 | * idetape_init_pc initializes a packet command. |
| 716 | */ |
| 717 | static void idetape_init_pc (idetape_pc_t *pc) |
| 718 | { |
| 719 | memset(pc->c, 0, 12); |
| 720 | pc->retries = 0; |
| 721 | pc->flags = 0; |
| 722 | pc->request_transfer = 0; |
| 723 | pc->buffer = pc->pc_buffer; |
| 724 | pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; |
| 725 | pc->bh = NULL; |
| 726 | pc->b_data = NULL; |
| 727 | } |
| 728 | |
| 729 | /* |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 730 | * called on each failed packet command retry to analyze the request sense. We |
| 731 | * currently do not utilize this information. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | */ |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 733 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
| 735 | idetape_tape_t *tape = drive->driver_data; |
| 736 | idetape_pc_t *pc = tape->failed_pc; |
| 737 | |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 738 | tape->sense_key = sense[2] & 0xF; |
| 739 | tape->asc = sense[12]; |
| 740 | tape->ascq = sense[13]; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 741 | |
| 742 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", |
| 743 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 745 | /* Correct pc->actually_transferred by asking the tape. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | if (test_bit(PC_DMA_ERROR, &pc->flags)) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 747 | pc->actually_transferred = pc->request_transfer - |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 748 | tape->blk_size * |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 749 | be32_to_cpu(get_unaligned((u32 *)&sense[3])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | idetape_update_buffers(pc); |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * If error was the result of a zero-length read or write command, |
| 755 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
| 756 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
| 757 | */ |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 758 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 759 | /* length == 0 */ |
| 760 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
| 761 | if (tape->sense_key == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | /* don't report an error, everything's ok */ |
| 763 | pc->error = 0; |
| 764 | /* don't retry read/write */ |
| 765 | set_bit(PC_ABORT, &pc->flags); |
| 766 | } |
| 767 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 768 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | pc->error = IDETAPE_ERROR_FILEMARK; |
| 770 | set_bit(PC_ABORT, &pc->flags); |
| 771 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 772 | if (pc->c[0] == WRITE_6) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 773 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
| 774 | && tape->asc == 0x0 && tape->ascq == 0x2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | pc->error = IDETAPE_ERROR_EOD; |
| 776 | set_bit(PC_ABORT, &pc->flags); |
| 777 | } |
| 778 | } |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 779 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 780 | if (tape->sense_key == 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | pc->error = IDETAPE_ERROR_EOD; |
| 782 | set_bit(PC_ABORT, &pc->flags); |
| 783 | } |
| 784 | if (!test_bit(PC_ABORT, &pc->flags) && |
| 785 | pc->actually_transferred) |
| 786 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
| 787 | } |
| 788 | } |
| 789 | |
Borislav Petkov | 419d474 | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 790 | static void idetape_activate_next_stage(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | { |
| 792 | idetape_tape_t *tape = drive->driver_data; |
| 793 | idetape_stage_t *stage = tape->next_stage; |
| 794 | struct request *rq = &stage->rq; |
| 795 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 796 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | if (stage == NULL) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 799 | printk(KERN_ERR "ide-tape: bug: Trying to activate a non" |
| 800 | " existing stage\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | return; |
| 802 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
| 804 | rq->rq_disk = tape->disk; |
| 805 | rq->buffer = NULL; |
| 806 | rq->special = (void *)stage->bh; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 807 | tape->active_data_rq = rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | tape->active_stage = stage; |
| 809 | tape->next_stage = stage->next; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * idetape_increase_max_pipeline_stages is a part of the feedback |
| 814 | * loop which tries to find the optimum number of stages. In the |
| 815 | * feedback loop, we are starting from a minimum maximum number of |
| 816 | * stages, and if we sense that the pipeline is empty, we try to |
| 817 | * increase it, until we reach the user compile time memory limit. |
| 818 | */ |
| 819 | static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) |
| 820 | { |
| 821 | idetape_tape_t *tape = drive->driver_data; |
| 822 | int increase = (tape->max_pipeline - tape->min_pipeline) / 10; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 823 | |
| 824 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
| 826 | tape->max_stages += max(increase, 1); |
| 827 | tape->max_stages = max(tape->max_stages, tape->min_pipeline); |
| 828 | tape->max_stages = min(tape->max_stages, tape->max_pipeline); |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * idetape_kfree_stage calls kfree to completely free a stage, along with |
| 833 | * its related buffers. |
| 834 | */ |
| 835 | static void __idetape_kfree_stage (idetape_stage_t *stage) |
| 836 | { |
| 837 | struct idetape_bh *prev_bh, *bh = stage->bh; |
| 838 | int size; |
| 839 | |
| 840 | while (bh != NULL) { |
| 841 | if (bh->b_data != NULL) { |
| 842 | size = (int) bh->b_size; |
| 843 | while (size > 0) { |
| 844 | free_page((unsigned long) bh->b_data); |
| 845 | size -= PAGE_SIZE; |
| 846 | bh->b_data += PAGE_SIZE; |
| 847 | } |
| 848 | } |
| 849 | prev_bh = bh; |
| 850 | bh = bh->b_reqnext; |
| 851 | kfree(prev_bh); |
| 852 | } |
| 853 | kfree(stage); |
| 854 | } |
| 855 | |
| 856 | static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) |
| 857 | { |
| 858 | __idetape_kfree_stage(stage); |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * idetape_remove_stage_head removes tape->first_stage from the pipeline. |
| 863 | * The caller should avoid race conditions. |
| 864 | */ |
| 865 | static void idetape_remove_stage_head (ide_drive_t *drive) |
| 866 | { |
| 867 | idetape_tape_t *tape = drive->driver_data; |
| 868 | idetape_stage_t *stage; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 869 | |
| 870 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | if (tape->first_stage == NULL) { |
| 873 | printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); |
Borislav Petkov | 55a5d29 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 874 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } |
| 876 | if (tape->active_stage == tape->first_stage) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 877 | printk(KERN_ERR "ide-tape: bug: Trying to free our active " |
| 878 | "pipeline stage\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | return; |
| 880 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | stage = tape->first_stage; |
| 882 | tape->first_stage = stage->next; |
| 883 | idetape_kfree_stage(tape, stage); |
| 884 | tape->nr_stages--; |
| 885 | if (tape->first_stage == NULL) { |
| 886 | tape->last_stage = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (tape->next_stage != NULL) |
| 888 | printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); |
| 889 | if (tape->nr_stages) |
| 890 | printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
| 892 | } |
| 893 | |
| 894 | /* |
| 895 | * This will free all the pipeline stages starting from new_last_stage->next |
| 896 | * to the end of the list, and point tape->last_stage to new_last_stage. |
| 897 | */ |
| 898 | static void idetape_abort_pipeline(ide_drive_t *drive, |
| 899 | idetape_stage_t *new_last_stage) |
| 900 | { |
| 901 | idetape_tape_t *tape = drive->driver_data; |
| 902 | idetape_stage_t *stage = new_last_stage->next; |
| 903 | idetape_stage_t *nstage; |
| 904 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 905 | debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__); |
| 906 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | while (stage) { |
| 908 | nstage = stage->next; |
| 909 | idetape_kfree_stage(tape, stage); |
| 910 | --tape->nr_stages; |
| 911 | --tape->nr_pending_stages; |
| 912 | stage = nstage; |
| 913 | } |
| 914 | if (new_last_stage) |
| 915 | new_last_stage->next = NULL; |
| 916 | tape->last_stage = new_last_stage; |
| 917 | tape->next_stage = NULL; |
| 918 | } |
| 919 | |
| 920 | /* |
| 921 | * idetape_end_request is used to finish servicing a request, and to |
| 922 | * insert a pending pipeline request into the main device queue. |
| 923 | */ |
| 924 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
| 925 | { |
| 926 | struct request *rq = HWGROUP(drive)->rq; |
| 927 | idetape_tape_t *tape = drive->driver_data; |
| 928 | unsigned long flags; |
| 929 | int error; |
| 930 | int remove_stage = 0; |
| 931 | idetape_stage_t *active_stage; |
| 932 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 933 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
| 935 | switch (uptodate) { |
| 936 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
| 937 | case 1: error = 0; break; |
| 938 | default: error = uptodate; |
| 939 | } |
| 940 | rq->errors = error; |
| 941 | if (error) |
| 942 | tape->failed_pc = NULL; |
| 943 | |
Bartlomiej Zolnierkiewicz | 3687221 | 2008-01-26 20:13:10 +0100 | [diff] [blame] | 944 | if (!blk_special_request(rq)) { |
| 945 | ide_end_request(drive, uptodate, nr_sects); |
| 946 | return 0; |
| 947 | } |
| 948 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 949 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
| 951 | /* The request was a pipelined data transfer request */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 952 | if (tape->active_data_rq == rq) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | active_stage = tape->active_stage; |
| 954 | tape->active_stage = NULL; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 955 | tape->active_data_rq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | tape->nr_pending_stages--; |
| 957 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
| 958 | remove_stage = 1; |
| 959 | if (error) { |
| 960 | set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 961 | if (error == IDETAPE_ERROR_EOD) |
| 962 | idetape_abort_pipeline(drive, active_stage); |
| 963 | } |
| 964 | } else if (rq->cmd[0] & REQ_IDETAPE_READ) { |
| 965 | if (error == IDETAPE_ERROR_EOD) { |
| 966 | set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 967 | idetape_abort_pipeline(drive, active_stage); |
| 968 | } |
| 969 | } |
| 970 | if (tape->next_stage != NULL) { |
Borislav Petkov | 419d474 | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 971 | idetape_activate_next_stage(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
| 973 | /* |
| 974 | * Insert the next request into the request queue. |
| 975 | */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 976 | (void)ide_do_drive_cmd(drive, tape->active_data_rq, |
| 977 | ide_end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } else if (!error) { |
| 979 | idetape_increase_max_pipeline_stages(drive); |
| 980 | } |
| 981 | } |
| 982 | ide_end_drive_cmd(drive, 0, 0); |
| 983 | // blkdev_dequeue_request(rq); |
| 984 | // drive->rq = NULL; |
| 985 | // end_that_request_last(rq); |
| 986 | |
| 987 | if (remove_stage) |
| 988 | idetape_remove_stage_head(drive); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 989 | if (tape->active_data_rq == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 991 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) |
| 996 | { |
| 997 | idetape_tape_t *tape = drive->driver_data; |
| 998 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 999 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 1000 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | if (!tape->pc->error) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 1002 | idetape_analyze_error(drive, tape->pc->buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | idetape_end_request(drive, 1, 0); |
| 1004 | } else { |
| 1005 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); |
| 1006 | idetape_end_request(drive, 0, 0); |
| 1007 | } |
| 1008 | return ide_stopped; |
| 1009 | } |
| 1010 | |
| 1011 | static void idetape_create_request_sense_cmd (idetape_pc_t *pc) |
| 1012 | { |
| 1013 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1014 | pc->c[0] = REQUEST_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | pc->c[4] = 20; |
| 1016 | pc->request_transfer = 20; |
| 1017 | pc->callback = &idetape_request_sense_callback; |
| 1018 | } |
| 1019 | |
| 1020 | static void idetape_init_rq(struct request *rq, u8 cmd) |
| 1021 | { |
| 1022 | memset(rq, 0, sizeof(*rq)); |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1023 | rq->cmd_type = REQ_TYPE_SPECIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | rq->cmd[0] = cmd; |
| 1025 | } |
| 1026 | |
| 1027 | /* |
| 1028 | * idetape_queue_pc_head generates a new packet command request in front |
| 1029 | * of the request queue, before the current request, so that it will be |
| 1030 | * processed immediately, on the next pass through the driver. |
| 1031 | * |
| 1032 | * idetape_queue_pc_head is called from the request handling part of |
| 1033 | * the driver (the "bottom" part). Safe storage for the request should |
| 1034 | * be allocated with idetape_next_pc_storage and idetape_next_rq_storage |
| 1035 | * before calling idetape_queue_pc_head. |
| 1036 | * |
| 1037 | * Memory for those requests is pre-allocated at initialization time, and |
| 1038 | * is limited to IDETAPE_PC_STACK requests. We assume that we have enough |
| 1039 | * space for the maximum possible number of inter-dependent packet commands. |
| 1040 | * |
| 1041 | * The higher level of the driver - The ioctl handler and the character |
| 1042 | * device handling functions should queue request to the lower level part |
| 1043 | * and wait for their completion using idetape_queue_pc_tail or |
| 1044 | * idetape_queue_rw_tail. |
| 1045 | */ |
| 1046 | static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) |
| 1047 | { |
| 1048 | struct ide_tape_obj *tape = drive->driver_data; |
| 1049 | |
| 1050 | idetape_init_rq(rq, REQ_IDETAPE_PC1); |
| 1051 | rq->buffer = (char *) pc; |
| 1052 | rq->rq_disk = tape->disk; |
| 1053 | (void) ide_do_drive_cmd(drive, rq, ide_preempt); |
| 1054 | } |
| 1055 | |
| 1056 | /* |
| 1057 | * idetape_retry_pc is called when an error was detected during the |
| 1058 | * last packet command. We queue a request sense packet command in |
| 1059 | * the head of the request list. |
| 1060 | */ |
| 1061 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) |
| 1062 | { |
| 1063 | idetape_tape_t *tape = drive->driver_data; |
| 1064 | idetape_pc_t *pc; |
| 1065 | struct request *rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
Bartlomiej Zolnierkiewicz | 64a57fe | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1067 | (void)ide_read_error(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | pc = idetape_next_pc_storage(drive); |
| 1069 | rq = idetape_next_rq_storage(drive); |
| 1070 | idetape_create_request_sense_cmd(pc); |
| 1071 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); |
| 1072 | idetape_queue_pc_head(drive, pc, rq); |
| 1073 | return ide_stopped; |
| 1074 | } |
| 1075 | |
| 1076 | /* |
| 1077 | * idetape_postpone_request postpones the current request so that |
| 1078 | * ide.c will be able to service requests from another device on |
| 1079 | * the same hwgroup while we are polling for DSC. |
| 1080 | */ |
| 1081 | static void idetape_postpone_request (ide_drive_t *drive) |
| 1082 | { |
| 1083 | idetape_tape_t *tape = drive->driver_data; |
| 1084 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1085 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 1086 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | tape->postponed_rq = HWGROUP(drive)->rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1088 | ide_stall_queue(drive, tape->dsc_poll_freq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } |
| 1090 | |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1091 | typedef void idetape_io_buf(ide_drive_t *, idetape_pc_t *, unsigned int); |
| 1092 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | /* |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1094 | * This is the usual interrupt handler which will be called during a packet |
| 1095 | * command. We will transfer some of the data (as requested by the drive) and |
| 1096 | * will re-point interrupt handler to us. When data transfer is finished, we |
| 1097 | * will act according to the algorithm described before |
| 1098 | * idetape_issue_packet_command. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | */ |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1100 | static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | { |
| 1102 | ide_hwif_t *hwif = drive->hwif; |
| 1103 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | idetape_pc_t *pc = tape->pc; |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1105 | xfer_func_t *xferfunc; |
| 1106 | idetape_io_buf *iobuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | unsigned int temp; |
| 1108 | #if SIMULATE_ERRORS |
| 1109 | static int error_sim_count = 0; |
| 1110 | #endif |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1111 | u16 bcount; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1112 | u8 stat, ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1114 | debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | |
| 1116 | /* Clear the interrupt */ |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1117 | stat = ide_read_status(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
| 1119 | if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1120 | if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | /* |
| 1122 | * A DMA error is sometimes expected. For example, |
| 1123 | * if the tape is crossing a filemark during a |
| 1124 | * READ command, it will issue an irq and position |
| 1125 | * itself before the filemark, so that only a partial |
| 1126 | * data transfer will occur (which causes the DMA |
| 1127 | * error). In that case, we will later ask the tape |
| 1128 | * how much bytes of the original request were |
| 1129 | * actually transferred (we can't receive that |
| 1130 | * information from the DMA engine on most chipsets). |
| 1131 | */ |
| 1132 | |
| 1133 | /* |
| 1134 | * On the contrary, a DMA error is never expected; |
| 1135 | * it usually indicates a hardware error or abort. |
| 1136 | * If the tape crosses a filemark during a READ |
| 1137 | * command, it will issue an irq and position itself |
| 1138 | * after the filemark (not before). Only a partial |
| 1139 | * data transfer will occur, but no DMA error. |
| 1140 | * (AS, 19 Apr 2001) |
| 1141 | */ |
| 1142 | set_bit(PC_DMA_ERROR, &pc->flags); |
| 1143 | } else { |
| 1144 | pc->actually_transferred = pc->request_transfer; |
| 1145 | idetape_update_buffers(pc); |
| 1146 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1147 | debug_log(DBG_PROCS, "DMA finished\n"); |
| 1148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | } |
| 1150 | |
| 1151 | /* No more interrupts */ |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1152 | if ((stat & DRQ_STAT) == 0) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1153 | debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
| 1154 | " transferred\n", pc->actually_transferred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1156 | clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | local_irq_enable(); |
| 1158 | |
| 1159 | #if SIMULATE_ERRORS |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1160 | if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | (++error_sim_count % 100) == 0) { |
| 1162 | printk(KERN_INFO "ide-tape: %s: simulating error\n", |
| 1163 | tape->name); |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1164 | stat |= ERR_STAT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
| 1166 | #endif |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1167 | if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1168 | stat &= ~ERR_STAT; |
| 1169 | if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) { |
| 1170 | /* Error detected */ |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1171 | debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
| 1172 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1173 | if (pc->c[0] == REQUEST_SENSE) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1174 | printk(KERN_ERR "ide-tape: I/O error in request" |
| 1175 | " sense command\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | return ide_do_reset(drive); |
| 1177 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1178 | debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
| 1179 | pc->c[0]); |
| 1180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | /* Retry operation */ |
| 1182 | return idetape_retry_pc(drive); |
| 1183 | } |
| 1184 | pc->error = 0; |
| 1185 | if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1186 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | /* Media access command */ |
| 1188 | tape->dsc_polling_start = jiffies; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1189 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
| 1191 | /* Allow ide.c to handle other requests */ |
| 1192 | idetape_postpone_request(drive); |
| 1193 | return ide_stopped; |
| 1194 | } |
| 1195 | if (tape->failed_pc == pc) |
| 1196 | tape->failed_pc = NULL; |
| 1197 | /* Command finished - Call the callback function */ |
| 1198 | return pc->callback(drive); |
| 1199 | } |
| 1200 | if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { |
| 1201 | printk(KERN_ERR "ide-tape: The tape wants to issue more " |
| 1202 | "interrupts in DMA mode\n"); |
| 1203 | printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 1204 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | return ide_do_reset(drive); |
| 1206 | } |
| 1207 | /* Get the number of bytes to transfer on this interrupt. */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1208 | bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | |
| 1209 | hwif->INB(IDE_BCOUNTL_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1211 | ireason = hwif->INB(IDE_IREASON_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1213 | if (ireason & CD) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1214 | printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | return ide_do_reset(drive); |
| 1216 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1217 | if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | /* Hopefully, we will never get here */ |
| 1219 | printk(KERN_ERR "ide-tape: We wanted to %s, ", |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1220 | (ireason & IO) ? "Write" : "Read"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | 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] | 1222 | (ireason & IO) ? "Read" : "Write"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | return ide_do_reset(drive); |
| 1224 | } |
| 1225 | if (!test_bit(PC_WRITING, &pc->flags)) { |
| 1226 | /* Reading - Check that we have enough space */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1227 | temp = pc->actually_transferred + bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | if (temp > pc->request_transfer) { |
| 1229 | if (temp > pc->buffer_size) { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1230 | printk(KERN_ERR "ide-tape: The tape wants to " |
| 1231 | "send us more data than expected " |
| 1232 | "- discarding data\n"); |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1233 | idetape_discard_data(drive, bcount); |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1234 | ide_set_handler(drive, &idetape_pc_intr, |
| 1235 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | return ide_started; |
| 1237 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1238 | debug_log(DBG_SENSE, "The tape wants to send us more " |
| 1239 | "data than expected - allowing transfer\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1241 | iobuf = &idetape_input_buffers; |
| 1242 | xferfunc = hwif->atapi_input_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } else { |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1244 | iobuf = &idetape_output_buffers; |
| 1245 | xferfunc = hwif->atapi_output_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | } |
Borislav Petkov | a1efc85 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1247 | |
| 1248 | if (pc->bh) |
| 1249 | iobuf(drive, pc, bcount); |
| 1250 | else |
| 1251 | xferfunc(drive, pc->current_position, bcount); |
| 1252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | /* Update the current position */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1254 | pc->actually_transferred += bcount; |
| 1255 | pc->current_position += bcount; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1256 | |
| 1257 | debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", |
| 1258 | pc->c[0], bcount); |
| 1259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | /* And set the interrupt handler again */ |
| 1261 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 1262 | return ide_started; |
| 1263 | } |
| 1264 | |
| 1265 | /* |
| 1266 | * Packet Command Interface |
| 1267 | * |
| 1268 | * The current Packet Command is available in tape->pc, and will not |
| 1269 | * change until we finish handling it. Each packet command is associated |
| 1270 | * with a callback function that will be called when the command is |
| 1271 | * finished. |
| 1272 | * |
| 1273 | * The handling will be done in three stages: |
| 1274 | * |
| 1275 | * 1. idetape_issue_packet_command will send the packet command to the |
| 1276 | * drive, and will set the interrupt handler to idetape_pc_intr. |
| 1277 | * |
| 1278 | * 2. On each interrupt, idetape_pc_intr will be called. This step |
| 1279 | * will be repeated until the device signals us that no more |
| 1280 | * interrupts will be issued. |
| 1281 | * |
| 1282 | * 3. ATAPI Tape media access commands have immediate status with a |
| 1283 | * delayed process. In case of a successful initiation of a |
| 1284 | * media access packet command, the DSC bit will be set when the |
| 1285 | * actual execution of the command is finished. |
| 1286 | * Since the tape drive will not issue an interrupt, we have to |
| 1287 | * poll for this event. In this case, we define the request as |
| 1288 | * "low priority request" by setting rq_status to |
| 1289 | * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit |
| 1290 | * the driver. |
| 1291 | * |
| 1292 | * ide.c will then give higher priority to requests which |
| 1293 | * originate from the other device, until will change rq_status |
| 1294 | * to RQ_ACTIVE. |
| 1295 | * |
| 1296 | * 4. When the packet command is finished, it will be checked for errors. |
| 1297 | * |
| 1298 | * 5. In case an error was found, we queue a request sense packet |
| 1299 | * command in front of the request queue and retry the operation |
| 1300 | * up to IDETAPE_MAX_PC_RETRIES times. |
| 1301 | * |
| 1302 | * 6. In case no error was found, or we decided to give up and not |
| 1303 | * to retry again, the callback function will be called and then |
| 1304 | * we will handle the next request. |
| 1305 | * |
| 1306 | */ |
| 1307 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
| 1308 | { |
| 1309 | ide_hwif_t *hwif = drive->hwif; |
| 1310 | idetape_tape_t *tape = drive->driver_data; |
| 1311 | idetape_pc_t *pc = tape->pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | int retries = 100; |
| 1313 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1314 | u8 ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
| 1316 | if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { |
| 1317 | printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); |
| 1318 | return startstop; |
| 1319 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1320 | ireason = hwif->INB(IDE_IREASON_REG); |
| 1321 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
| 1323 | "a packet command, retrying\n"); |
| 1324 | udelay(100); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1325 | ireason = hwif->INB(IDE_IREASON_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | if (retries == 0) { |
| 1327 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " |
| 1328 | "issuing a packet command, ignoring\n"); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1329 | ireason |= CD; |
| 1330 | ireason &= ~IO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | } |
| 1332 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1333 | if ((ireason & CD) == 0 || (ireason & IO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
| 1335 | "a packet command\n"); |
| 1336 | return ide_do_reset(drive); |
| 1337 | } |
| 1338 | /* Set the interrupt routine */ |
| 1339 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 1340 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 1341 | /* Begin DMA, if necessary */ |
| 1342 | if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) |
| 1343 | hwif->dma_start(drive); |
| 1344 | #endif |
| 1345 | /* Send the actual packet */ |
| 1346 | HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); |
| 1347 | return ide_started; |
| 1348 | } |
| 1349 | |
| 1350 | static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) |
| 1351 | { |
| 1352 | ide_hwif_t *hwif = drive->hwif; |
| 1353 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | int dma_ok = 0; |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1355 | u16 bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1357 | if (tape->pc->c[0] == REQUEST_SENSE && |
| 1358 | pc->c[0] == REQUEST_SENSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
| 1360 | "Two request sense in serial were issued\n"); |
| 1361 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1363 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | tape->failed_pc = pc; |
| 1365 | /* Set the current packet command */ |
| 1366 | tape->pc = pc; |
| 1367 | |
| 1368 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
| 1369 | test_bit(PC_ABORT, &pc->flags)) { |
| 1370 | /* |
| 1371 | * We will "abort" retrying a packet command in case |
| 1372 | * a legitimate error code was received (crossing a |
| 1373 | * filemark, or end of the media, for example). |
| 1374 | */ |
| 1375 | if (!test_bit(PC_ABORT, &pc->flags)) { |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1376 | if (!(pc->c[0] == TEST_UNIT_READY && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | tape->sense_key == 2 && tape->asc == 4 && |
| 1378 | (tape->ascq == 1 || tape->ascq == 8))) { |
| 1379 | printk(KERN_ERR "ide-tape: %s: I/O error, " |
| 1380 | "pc = %2x, key = %2x, " |
| 1381 | "asc = %2x, ascq = %2x\n", |
| 1382 | tape->name, pc->c[0], |
| 1383 | tape->sense_key, tape->asc, |
| 1384 | tape->ascq); |
| 1385 | } |
| 1386 | /* Giving up */ |
| 1387 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1388 | } |
| 1389 | tape->failed_pc = NULL; |
| 1390 | return pc->callback(drive); |
| 1391 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1392 | 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] | 1393 | |
| 1394 | pc->retries++; |
| 1395 | /* We haven't transferred any data yet */ |
| 1396 | pc->actually_transferred = 0; |
| 1397 | pc->current_position = pc->buffer; |
| 1398 | /* Request to transfer the entire buffer at once */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1399 | bcount = pc->request_transfer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
| 1401 | if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { |
| 1402 | printk(KERN_WARNING "ide-tape: DMA disabled, " |
| 1403 | "reverting to PIO\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 1404 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) |
| 1407 | dma_ok = !hwif->dma_setup(drive); |
| 1408 | |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1409 | ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | |
| 1410 | IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); |
| 1411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | if (dma_ok) /* Will begin DMA later */ |
| 1413 | set_bit(PC_DMA_IN_PROGRESS, &pc->flags); |
| 1414 | if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { |
Bartlomiej Zolnierkiewicz | c1c9dbc | 2008-02-02 19:56:44 +0100 | [diff] [blame] | 1415 | ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
| 1416 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | return ide_started; |
| 1418 | } else { |
| 1419 | hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); |
| 1420 | return idetape_transfer_pc(drive); |
| 1421 | } |
| 1422 | } |
| 1423 | |
| 1424 | /* |
| 1425 | * General packet command callback function. |
| 1426 | */ |
| 1427 | static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) |
| 1428 | { |
| 1429 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1430 | |
| 1431 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | |
| 1433 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); |
| 1434 | return ide_stopped; |
| 1435 | } |
| 1436 | |
| 1437 | /* |
| 1438 | * A mode sense command is used to "sense" tape parameters. |
| 1439 | */ |
| 1440 | static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) |
| 1441 | { |
| 1442 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1443 | pc->c[0] = MODE_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
| 1445 | pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ |
| 1446 | pc->c[2] = page_code; |
| 1447 | /* |
| 1448 | * Changed pc->c[3] to 0 (255 will at best return unused info). |
| 1449 | * |
| 1450 | * For SCSI this byte is defined as subpage instead of high byte |
| 1451 | * of length and some IDE drives seem to interpret it this way |
| 1452 | * and return an error when 255 is used. |
| 1453 | */ |
| 1454 | pc->c[3] = 0; |
| 1455 | pc->c[4] = 255; /* (We will just discard data in that case) */ |
| 1456 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
| 1457 | pc->request_transfer = 12; |
| 1458 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
| 1459 | pc->request_transfer = 24; |
| 1460 | else |
| 1461 | pc->request_transfer = 50; |
| 1462 | pc->callback = &idetape_pc_callback; |
| 1463 | } |
| 1464 | |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1465 | static void idetape_calculate_speeds(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | { |
| 1467 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
| 1469 | if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { |
| 1470 | tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; |
| 1471 | tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; |
| 1472 | tape->controlled_last_pipeline_head = tape->pipeline_head; |
| 1473 | tape->controlled_pipeline_head_time = jiffies; |
| 1474 | } |
| 1475 | if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) |
| 1476 | tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); |
| 1477 | else if (time_after(jiffies, tape->controlled_previous_head_time)) |
| 1478 | tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); |
| 1479 | |
| 1480 | if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { |
| 1481 | /* -1 for read mode error recovery */ |
| 1482 | if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { |
| 1483 | tape->uncontrolled_pipeline_head_time = jiffies; |
| 1484 | tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); |
| 1485 | } |
| 1486 | } else { |
| 1487 | tape->uncontrolled_previous_head_time = jiffies; |
| 1488 | tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; |
| 1489 | if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { |
| 1490 | tape->uncontrolled_pipeline_head_time = jiffies; |
| 1491 | } |
| 1492 | } |
| 1493 | tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1494 | |
| 1495 | if (tape->speed_control == 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | if (tape->nr_pending_stages >= tape->max_stages / 2) |
| 1497 | tape->max_insert_speed = tape->pipeline_head_speed + |
| 1498 | (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; |
| 1499 | else |
| 1500 | tape->max_insert_speed = 500 + |
| 1501 | (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) |
| 1504 | tape->max_insert_speed = 5000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | } else |
| 1506 | tape->max_insert_speed = tape->speed_control; |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | tape->max_insert_speed = max(tape->max_insert_speed, 500); |
| 1509 | } |
| 1510 | |
| 1511 | static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) |
| 1512 | { |
| 1513 | idetape_tape_t *tape = drive->driver_data; |
| 1514 | idetape_pc_t *pc = tape->pc; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1515 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1517 | stat = ide_read_status(drive); |
| 1518 | |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1519 | if (stat & SEEK_STAT) { |
| 1520 | if (stat & ERR_STAT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | /* Error detected */ |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1522 | if (pc->c[0] != TEST_UNIT_READY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
| 1524 | tape->name); |
| 1525 | /* Retry operation */ |
| 1526 | return idetape_retry_pc(drive); |
| 1527 | } |
| 1528 | pc->error = 0; |
| 1529 | if (tape->failed_pc == pc) |
| 1530 | tape->failed_pc = NULL; |
| 1531 | } else { |
| 1532 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1533 | tape->failed_pc = NULL; |
| 1534 | } |
| 1535 | return pc->callback(drive); |
| 1536 | } |
| 1537 | |
| 1538 | static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) |
| 1539 | { |
| 1540 | idetape_tape_t *tape = drive->driver_data; |
| 1541 | struct request *rq = HWGROUP(drive)->rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1542 | int blocks = tape->pc->actually_transferred / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1544 | tape->avg_size += blocks * tape->blk_size; |
| 1545 | tape->insert_size += blocks * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | if (tape->insert_size > 1024 * 1024) |
| 1547 | tape->measure_insert_time = 1; |
| 1548 | if (tape->measure_insert_time) { |
| 1549 | tape->measure_insert_time = 0; |
| 1550 | tape->insert_time = jiffies; |
| 1551 | tape->insert_size = 0; |
| 1552 | } |
| 1553 | if (time_after(jiffies, tape->insert_time)) |
| 1554 | tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 1555 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; |
| 1557 | tape->avg_size = 0; |
| 1558 | tape->avg_time = jiffies; |
| 1559 | } |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1560 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1562 | tape->first_frame += blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | rq->current_nr_sectors -= blocks; |
| 1564 | |
| 1565 | if (!tape->pc->error) |
| 1566 | idetape_end_request(drive, 1, 0); |
| 1567 | else |
| 1568 | idetape_end_request(drive, tape->pc->error, 0); |
| 1569 | return ide_stopped; |
| 1570 | } |
| 1571 | |
| 1572 | static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) |
| 1573 | { |
| 1574 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1575 | pc->c[0] = READ_6; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1576 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | pc->c[1] = 1; |
| 1578 | pc->callback = &idetape_rw_callback; |
| 1579 | pc->bh = bh; |
| 1580 | atomic_set(&bh->b_count, 0); |
| 1581 | pc->buffer = NULL; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1582 | pc->buffer_size = length * tape->blk_size; |
| 1583 | pc->request_transfer = pc->buffer_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | if (pc->request_transfer == tape->stage_size) |
| 1585 | set_bit(PC_DMA_RECOMMENDED, &pc->flags); |
| 1586 | } |
| 1587 | |
| 1588 | static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) |
| 1589 | { |
| 1590 | int size = 32768; |
| 1591 | struct idetape_bh *p = bh; |
| 1592 | |
| 1593 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1594 | pc->c[0] = READ_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; |
| 1596 | pc->c[7] = size >> 8; |
| 1597 | pc->c[8] = size & 0xff; |
| 1598 | pc->callback = &idetape_pc_callback; |
| 1599 | pc->bh = bh; |
| 1600 | atomic_set(&bh->b_count, 0); |
| 1601 | pc->buffer = NULL; |
| 1602 | while (p) { |
| 1603 | atomic_set(&p->b_count, 0); |
| 1604 | p = p->b_reqnext; |
| 1605 | } |
| 1606 | pc->request_transfer = pc->buffer_size = size; |
| 1607 | } |
| 1608 | |
| 1609 | static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) |
| 1610 | { |
| 1611 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1612 | pc->c[0] = WRITE_6; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1613 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | pc->c[1] = 1; |
| 1615 | pc->callback = &idetape_rw_callback; |
| 1616 | set_bit(PC_WRITING, &pc->flags); |
| 1617 | pc->bh = bh; |
| 1618 | pc->b_data = bh->b_data; |
| 1619 | pc->b_count = atomic_read(&bh->b_count); |
| 1620 | pc->buffer = NULL; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1621 | pc->buffer_size = length * tape->blk_size; |
| 1622 | pc->request_transfer = pc->buffer_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | if (pc->request_transfer == tape->stage_size) |
| 1624 | set_bit(PC_DMA_RECOMMENDED, &pc->flags); |
| 1625 | } |
| 1626 | |
| 1627 | /* |
| 1628 | * idetape_do_request is our request handling function. |
| 1629 | */ |
| 1630 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
| 1631 | struct request *rq, sector_t block) |
| 1632 | { |
| 1633 | idetape_tape_t *tape = drive->driver_data; |
| 1634 | idetape_pc_t *pc = NULL; |
| 1635 | struct request *postponed_rq = tape->postponed_rq; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1636 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1638 | debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
| 1639 | " current_nr_sectors: %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1642 | if (!blk_special_request(rq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | /* |
| 1644 | * We do not support buffer cache originated requests. |
| 1645 | */ |
| 1646 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1647 | "request queue (%d)\n", drive->name, rq->cmd_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | ide_end_request(drive, 0, 0); |
| 1649 | return ide_stopped; |
| 1650 | } |
| 1651 | |
| 1652 | /* |
| 1653 | * Retry a failed packet command |
| 1654 | */ |
| 1655 | if (tape->failed_pc != NULL && |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 1656 | tape->pc->c[0] == REQUEST_SENSE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | return idetape_issue_packet_command(drive, tape->failed_pc); |
| 1658 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | if (postponed_rq != NULL) |
| 1660 | if (rq != postponed_rq) { |
| 1661 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " |
| 1662 | "Two DSC requests were queued\n"); |
| 1663 | idetape_end_request(drive, 0, 0); |
| 1664 | return ide_stopped; |
| 1665 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
| 1667 | tape->postponed_rq = NULL; |
| 1668 | |
| 1669 | /* |
| 1670 | * If the tape is still busy, postpone our request and service |
| 1671 | * the other device meanwhile. |
| 1672 | */ |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1673 | stat = ide_read_status(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
| 1675 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) |
| 1676 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); |
| 1677 | |
| 1678 | if (drive->post_reset == 1) { |
| 1679 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); |
| 1680 | drive->post_reset = 0; |
| 1681 | } |
| 1682 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | if (time_after(jiffies, tape->insert_time)) |
| 1684 | tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1685 | idetape_calculate_speeds(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1687 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | if (postponed_rq == NULL) { |
| 1689 | tape->dsc_polling_start = jiffies; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1690 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
| 1692 | } else if (time_after(jiffies, tape->dsc_timeout)) { |
| 1693 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", |
| 1694 | tape->name); |
| 1695 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 1696 | idetape_media_access_finished(drive); |
| 1697 | return ide_stopped; |
| 1698 | } else { |
| 1699 | return ide_do_reset(drive); |
| 1700 | } |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 1701 | } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1702 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | idetape_postpone_request(drive); |
| 1704 | return ide_stopped; |
| 1705 | } |
| 1706 | if (rq->cmd[0] & REQ_IDETAPE_READ) { |
| 1707 | tape->buffer_head++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | tape->postpone_cnt = 0; |
| 1709 | pc = idetape_next_pc_storage(drive); |
| 1710 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); |
| 1711 | goto out; |
| 1712 | } |
| 1713 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
| 1714 | tape->buffer_head++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | tape->postpone_cnt = 0; |
| 1716 | pc = idetape_next_pc_storage(drive); |
| 1717 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); |
| 1718 | goto out; |
| 1719 | } |
| 1720 | if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { |
| 1721 | tape->postpone_cnt = 0; |
| 1722 | pc = idetape_next_pc_storage(drive); |
| 1723 | idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); |
| 1724 | goto out; |
| 1725 | } |
| 1726 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
| 1727 | pc = (idetape_pc_t *) rq->buffer; |
| 1728 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
| 1729 | rq->cmd[0] |= REQ_IDETAPE_PC2; |
| 1730 | goto out; |
| 1731 | } |
| 1732 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 1733 | idetape_media_access_finished(drive); |
| 1734 | return ide_stopped; |
| 1735 | } |
| 1736 | BUG(); |
| 1737 | out: |
| 1738 | return idetape_issue_packet_command(drive, pc); |
| 1739 | } |
| 1740 | |
| 1741 | /* |
| 1742 | * Pipeline related functions |
| 1743 | */ |
| 1744 | static inline int idetape_pipeline_active (idetape_tape_t *tape) |
| 1745 | { |
| 1746 | int rc1, rc2; |
| 1747 | |
| 1748 | rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1749 | rc2 = (tape->active_data_rq != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | return rc1; |
| 1751 | } |
| 1752 | |
| 1753 | /* |
| 1754 | * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline |
| 1755 | * stage, along with all the necessary small buffers which together make |
| 1756 | * a buffer of size tape->stage_size (or a bit more). We attempt to |
| 1757 | * combine sequential pages as much as possible. |
| 1758 | * |
| 1759 | * Returns a pointer to the new allocated stage, or NULL if we |
| 1760 | * can't (or don't want to) allocate a stage. |
| 1761 | * |
| 1762 | * Pipeline stages are optional and are used to increase performance. |
| 1763 | * If we can't allocate them, we'll manage without them. |
| 1764 | */ |
| 1765 | static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) |
| 1766 | { |
| 1767 | idetape_stage_t *stage; |
| 1768 | struct idetape_bh *prev_bh, *bh; |
| 1769 | int pages = tape->pages_per_stage; |
| 1770 | char *b_data = NULL; |
| 1771 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 1772 | if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | return NULL; |
| 1774 | stage->next = NULL; |
| 1775 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 1776 | bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | if (bh == NULL) |
| 1778 | goto abort; |
| 1779 | bh->b_reqnext = NULL; |
| 1780 | if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) |
| 1781 | goto abort; |
| 1782 | if (clear) |
| 1783 | memset(bh->b_data, 0, PAGE_SIZE); |
| 1784 | bh->b_size = PAGE_SIZE; |
| 1785 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 1786 | |
| 1787 | while (--pages) { |
| 1788 | if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) |
| 1789 | goto abort; |
| 1790 | if (clear) |
| 1791 | memset(b_data, 0, PAGE_SIZE); |
| 1792 | if (bh->b_data == b_data + PAGE_SIZE) { |
| 1793 | bh->b_size += PAGE_SIZE; |
| 1794 | bh->b_data -= PAGE_SIZE; |
| 1795 | if (full) |
| 1796 | atomic_add(PAGE_SIZE, &bh->b_count); |
| 1797 | continue; |
| 1798 | } |
| 1799 | if (b_data == bh->b_data + bh->b_size) { |
| 1800 | bh->b_size += PAGE_SIZE; |
| 1801 | if (full) |
| 1802 | atomic_add(PAGE_SIZE, &bh->b_count); |
| 1803 | continue; |
| 1804 | } |
| 1805 | prev_bh = bh; |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 1806 | if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | free_page((unsigned long) b_data); |
| 1808 | goto abort; |
| 1809 | } |
| 1810 | bh->b_reqnext = NULL; |
| 1811 | bh->b_data = b_data; |
| 1812 | bh->b_size = PAGE_SIZE; |
| 1813 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 1814 | prev_bh->b_reqnext = bh; |
| 1815 | } |
| 1816 | bh->b_size -= tape->excess_bh_size; |
| 1817 | if (full) |
| 1818 | atomic_sub(tape->excess_bh_size, &bh->b_count); |
| 1819 | return stage; |
| 1820 | abort: |
| 1821 | __idetape_kfree_stage(stage); |
| 1822 | return NULL; |
| 1823 | } |
| 1824 | |
| 1825 | static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) |
| 1826 | { |
| 1827 | idetape_stage_t *cache_stage = tape->cache_stage; |
| 1828 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1829 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | |
| 1831 | if (tape->nr_stages >= tape->max_stages) |
| 1832 | return NULL; |
| 1833 | if (cache_stage != NULL) { |
| 1834 | tape->cache_stage = NULL; |
| 1835 | return cache_stage; |
| 1836 | } |
| 1837 | return __idetape_kmalloc_stage(tape, 0, 0); |
| 1838 | } |
| 1839 | |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1840 | static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | { |
| 1842 | struct idetape_bh *bh = tape->bh; |
| 1843 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1844 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | |
| 1846 | while (n) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | if (bh == NULL) { |
| 1848 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 1849 | "idetape_copy_stage_from_user\n"); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1850 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1853 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count)) |
| 1854 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | n -= count; |
| 1856 | atomic_add(count, &bh->b_count); |
| 1857 | buf += count; |
| 1858 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 1859 | bh = bh->b_reqnext; |
| 1860 | if (bh) |
| 1861 | atomic_set(&bh->b_count, 0); |
| 1862 | } |
| 1863 | } |
| 1864 | tape->bh = bh; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1865 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | } |
| 1867 | |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1868 | static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | { |
| 1870 | struct idetape_bh *bh = tape->bh; |
| 1871 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1872 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | |
| 1874 | while (n) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | if (bh == NULL) { |
| 1876 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 1877 | "idetape_copy_stage_to_user\n"); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1878 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | count = min(tape->b_count, n); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1881 | if (copy_to_user(buf, tape->b_data, count)) |
| 1882 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | n -= count; |
| 1884 | tape->b_data += count; |
| 1885 | tape->b_count -= count; |
| 1886 | buf += count; |
| 1887 | if (!tape->b_count) { |
| 1888 | tape->bh = bh = bh->b_reqnext; |
| 1889 | if (bh) { |
| 1890 | tape->b_data = bh->b_data; |
| 1891 | tape->b_count = atomic_read(&bh->b_count); |
| 1892 | } |
| 1893 | } |
| 1894 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 1895 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | } |
| 1897 | |
| 1898 | static void idetape_init_merge_stage (idetape_tape_t *tape) |
| 1899 | { |
| 1900 | struct idetape_bh *bh = tape->merge_stage->bh; |
| 1901 | |
| 1902 | tape->bh = bh; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 1903 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | atomic_set(&bh->b_count, 0); |
| 1905 | else { |
| 1906 | tape->b_data = bh->b_data; |
| 1907 | tape->b_count = atomic_read(&bh->b_count); |
| 1908 | } |
| 1909 | } |
| 1910 | |
| 1911 | static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) |
| 1912 | { |
| 1913 | struct idetape_bh *tmp; |
| 1914 | |
| 1915 | tmp = stage->bh; |
| 1916 | stage->bh = tape->merge_stage->bh; |
| 1917 | tape->merge_stage->bh = tmp; |
| 1918 | idetape_init_merge_stage(tape); |
| 1919 | } |
| 1920 | |
| 1921 | /* |
| 1922 | * idetape_add_stage_tail adds a new stage at the end of the pipeline. |
| 1923 | */ |
| 1924 | static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) |
| 1925 | { |
| 1926 | idetape_tape_t *tape = drive->driver_data; |
| 1927 | unsigned long flags; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1928 | |
| 1929 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 1930 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1931 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | stage->next = NULL; |
| 1933 | if (tape->last_stage != NULL) |
| 1934 | tape->last_stage->next=stage; |
| 1935 | else |
| 1936 | tape->first_stage = tape->next_stage=stage; |
| 1937 | tape->last_stage = stage; |
| 1938 | if (tape->next_stage == NULL) |
| 1939 | tape->next_stage = tape->last_stage; |
| 1940 | tape->nr_stages++; |
| 1941 | tape->nr_pending_stages++; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1942 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | } |
| 1944 | |
| 1945 | /* |
| 1946 | * idetape_wait_for_request installs a completion in a pending request |
| 1947 | * and sleeps until it is serviced. |
| 1948 | * |
| 1949 | * The caller should ensure that the request will not be serviced |
| 1950 | * before we install the completion (usually by disabling interrupts). |
| 1951 | */ |
| 1952 | static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) |
| 1953 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 1954 | DECLARE_COMPLETION_ONSTACK(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | idetape_tape_t *tape = drive->driver_data; |
| 1956 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1957 | if (rq == NULL || !blk_special_request(rq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); |
| 1959 | return; |
| 1960 | } |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 1961 | rq->end_io_data = &wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | rq->end_io = blk_end_sync_rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1963 | spin_unlock_irq(&tape->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | wait_for_completion(&wait); |
| 1965 | /* The stage and its struct request have been deallocated */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1966 | spin_lock_irq(&tape->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | } |
| 1968 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1969 | static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | { |
| 1971 | idetape_tape_t *tape = drive->driver_data; |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1972 | u8 *readpos = tape->pc->buffer; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1973 | |
| 1974 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | |
| 1976 | if (!tape->pc->error) { |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1977 | debug_log(DBG_SENSE, "BOP - %s\n", |
| 1978 | (readpos[0] & 0x80) ? "Yes" : "No"); |
| 1979 | debug_log(DBG_SENSE, "EOP - %s\n", |
| 1980 | (readpos[0] & 0x40) ? "Yes" : "No"); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1981 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1982 | if (readpos[0] & 0x4) { |
| 1983 | printk(KERN_INFO "ide-tape: Block location is unknown" |
| 1984 | "to the tape\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); |
| 1986 | idetape_end_request(drive, 0, 0); |
| 1987 | } else { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1988 | debug_log(DBG_SENSE, "Block Location - %u\n", |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1989 | be32_to_cpu(*(u32 *)&readpos[4])); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1990 | |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1991 | tape->partition = readpos[1]; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 1992 | tape->first_frame = |
Borislav Petkov | a2f5b7f | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1993 | be32_to_cpu(*(u32 *)&readpos[4]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); |
| 1995 | idetape_end_request(drive, 1, 0); |
| 1996 | } |
| 1997 | } else { |
| 1998 | idetape_end_request(drive, 0, 0); |
| 1999 | } |
| 2000 | return ide_stopped; |
| 2001 | } |
| 2002 | |
| 2003 | /* |
| 2004 | * idetape_create_write_filemark_cmd will: |
| 2005 | * |
| 2006 | * 1. Write a filemark if write_filemark=1. |
| 2007 | * 2. Flush the device buffers without writing a filemark |
| 2008 | * if write_filemark=0. |
| 2009 | * |
| 2010 | */ |
| 2011 | static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) |
| 2012 | { |
| 2013 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2014 | pc->c[0] = WRITE_FILEMARKS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | pc->c[4] = write_filemark; |
| 2016 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2017 | pc->callback = &idetape_pc_callback; |
| 2018 | } |
| 2019 | |
| 2020 | static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) |
| 2021 | { |
| 2022 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2023 | pc->c[0] = TEST_UNIT_READY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | pc->callback = &idetape_pc_callback; |
| 2025 | } |
| 2026 | |
| 2027 | /* |
| 2028 | * idetape_queue_pc_tail is based on the following functions: |
| 2029 | * |
| 2030 | * ide_do_drive_cmd from ide.c |
| 2031 | * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c |
| 2032 | * |
| 2033 | * We add a special packet command request to the tail of the request |
| 2034 | * queue, and wait for it to be serviced. |
| 2035 | * |
| 2036 | * This is not to be called from within the request handling part |
| 2037 | * of the driver ! We allocate here data in the stack, and it is valid |
| 2038 | * until the request is finished. This is not the case for the bottom |
| 2039 | * part of the driver, where we are always leaving the functions to wait |
| 2040 | * for an interrupt or a timer event. |
| 2041 | * |
| 2042 | * From the bottom part of the driver, we should allocate safe memory |
| 2043 | * using idetape_next_pc_storage and idetape_next_rq_storage, and add |
| 2044 | * the request to the request list without waiting for it to be serviced ! |
| 2045 | * In that case, we usually use idetape_queue_pc_head. |
| 2046 | */ |
| 2047 | static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) |
| 2048 | { |
| 2049 | struct ide_tape_obj *tape = drive->driver_data; |
| 2050 | struct request rq; |
| 2051 | |
| 2052 | idetape_init_rq(&rq, REQ_IDETAPE_PC1); |
| 2053 | rq.buffer = (char *) pc; |
| 2054 | rq.rq_disk = tape->disk; |
| 2055 | return ide_do_drive_cmd(drive, &rq, ide_wait); |
| 2056 | } |
| 2057 | |
| 2058 | static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) |
| 2059 | { |
| 2060 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2061 | pc->c[0] = START_STOP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | pc->c[4] = cmd; |
| 2063 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2064 | pc->callback = &idetape_pc_callback; |
| 2065 | } |
| 2066 | |
| 2067 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
| 2068 | { |
| 2069 | idetape_tape_t *tape = drive->driver_data; |
| 2070 | idetape_pc_t pc; |
| 2071 | int load_attempted = 0; |
| 2072 | |
| 2073 | /* |
| 2074 | * Wait for the tape to become ready |
| 2075 | */ |
| 2076 | set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); |
| 2077 | timeout += jiffies; |
| 2078 | while (time_before(jiffies, timeout)) { |
| 2079 | idetape_create_test_unit_ready_cmd(&pc); |
| 2080 | if (!__idetape_queue_pc_tail(drive, &pc)) |
| 2081 | return 0; |
| 2082 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) |
| 2083 | || (tape->asc == 0x3A)) { /* no media */ |
| 2084 | if (load_attempted) |
| 2085 | return -ENOMEDIUM; |
| 2086 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); |
| 2087 | __idetape_queue_pc_tail(drive, &pc); |
| 2088 | load_attempted = 1; |
| 2089 | /* not about to be ready */ |
| 2090 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && |
| 2091 | (tape->ascq == 1 || tape->ascq == 8))) |
| 2092 | return -EIO; |
Nishanth Aravamudan | 80ce45f | 2005-09-10 00:27:08 -0700 | [diff] [blame] | 2093 | msleep(100); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | } |
| 2095 | return -EIO; |
| 2096 | } |
| 2097 | |
| 2098 | static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) |
| 2099 | { |
| 2100 | return __idetape_queue_pc_tail(drive, pc); |
| 2101 | } |
| 2102 | |
| 2103 | static int idetape_flush_tape_buffers (ide_drive_t *drive) |
| 2104 | { |
| 2105 | idetape_pc_t pc; |
| 2106 | int rc; |
| 2107 | |
| 2108 | idetape_create_write_filemark_cmd(drive, &pc, 0); |
| 2109 | if ((rc = idetape_queue_pc_tail(drive, &pc))) |
| 2110 | return rc; |
| 2111 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 2112 | return 0; |
| 2113 | } |
| 2114 | |
| 2115 | static void idetape_create_read_position_cmd (idetape_pc_t *pc) |
| 2116 | { |
| 2117 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2118 | pc->c[0] = READ_POSITION; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | pc->request_transfer = 20; |
| 2120 | pc->callback = &idetape_read_position_callback; |
| 2121 | } |
| 2122 | |
| 2123 | static int idetape_read_position (ide_drive_t *drive) |
| 2124 | { |
| 2125 | idetape_tape_t *tape = drive->driver_data; |
| 2126 | idetape_pc_t pc; |
| 2127 | int position; |
| 2128 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2129 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | |
| 2131 | idetape_create_read_position_cmd(&pc); |
| 2132 | if (idetape_queue_pc_tail(drive, &pc)) |
| 2133 | return -1; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2134 | position = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | return position; |
| 2136 | } |
| 2137 | |
| 2138 | static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) |
| 2139 | { |
| 2140 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2141 | pc->c[0] = POSITION_TO_ELEMENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2142 | pc->c[1] = 2; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2143 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | pc->c[8] = partition; |
| 2145 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2146 | pc->callback = &idetape_pc_callback; |
| 2147 | } |
| 2148 | |
| 2149 | static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) |
| 2150 | { |
| 2151 | idetape_tape_t *tape = drive->driver_data; |
| 2152 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2153 | /* device supports locking according to capabilities page */ |
| 2154 | if (!(tape->caps[6] & 0x01)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | return 0; |
| 2156 | |
| 2157 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2158 | pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | pc->c[4] = prevent; |
| 2160 | pc->callback = &idetape_pc_callback; |
| 2161 | return 1; |
| 2162 | } |
| 2163 | |
| 2164 | static int __idetape_discard_read_pipeline (ide_drive_t *drive) |
| 2165 | { |
| 2166 | idetape_tape_t *tape = drive->driver_data; |
| 2167 | unsigned long flags; |
| 2168 | int cnt; |
| 2169 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2170 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | return 0; |
| 2172 | |
| 2173 | /* Remove merge stage. */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2174 | cnt = tape->merge_stage_size / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) |
| 2176 | ++cnt; /* Filemarks count as 1 sector */ |
| 2177 | tape->merge_stage_size = 0; |
| 2178 | if (tape->merge_stage != NULL) { |
| 2179 | __idetape_kfree_stage(tape->merge_stage); |
| 2180 | tape->merge_stage = NULL; |
| 2181 | } |
| 2182 | |
| 2183 | /* Clear pipeline flags. */ |
| 2184 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2185 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | |
| 2187 | /* Remove pipeline stages. */ |
| 2188 | if (tape->first_stage == NULL) |
| 2189 | return 0; |
| 2190 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2191 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | tape->next_stage = NULL; |
| 2193 | if (idetape_pipeline_active(tape)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2194 | idetape_wait_for_request(drive, tape->active_data_rq); |
| 2195 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | |
| 2197 | while (tape->first_stage != NULL) { |
| 2198 | struct request *rq_ptr = &tape->first_stage->rq; |
| 2199 | |
| 2200 | cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; |
| 2201 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) |
| 2202 | ++cnt; |
| 2203 | idetape_remove_stage_head(drive); |
| 2204 | } |
| 2205 | tape->nr_pending_stages = 0; |
| 2206 | tape->max_stages = tape->min_pipeline; |
| 2207 | return cnt; |
| 2208 | } |
| 2209 | |
| 2210 | /* |
| 2211 | * idetape_position_tape positions the tape to the requested block |
| 2212 | * using the LOCATE packet command. A READ POSITION command is then |
| 2213 | * issued to check where we are positioned. |
| 2214 | * |
| 2215 | * Like all higher level operations, we queue the commands at the tail |
| 2216 | * of the request queue and wait for their completion. |
| 2217 | * |
| 2218 | */ |
| 2219 | static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) |
| 2220 | { |
| 2221 | idetape_tape_t *tape = drive->driver_data; |
| 2222 | int retval; |
| 2223 | idetape_pc_t pc; |
| 2224 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2225 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | __idetape_discard_read_pipeline(drive); |
| 2227 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 2228 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); |
| 2229 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2230 | if (retval) |
| 2231 | return (retval); |
| 2232 | |
| 2233 | idetape_create_read_position_cmd(&pc); |
| 2234 | return (idetape_queue_pc_tail(drive, &pc)); |
| 2235 | } |
| 2236 | |
| 2237 | static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) |
| 2238 | { |
| 2239 | idetape_tape_t *tape = drive->driver_data; |
| 2240 | int cnt; |
| 2241 | int seek, position; |
| 2242 | |
| 2243 | cnt = __idetape_discard_read_pipeline(drive); |
| 2244 | if (restore_position) { |
| 2245 | position = idetape_read_position(drive); |
| 2246 | seek = position > cnt ? position - cnt : 0; |
| 2247 | if (idetape_position_tape(drive, seek, 0, 0)) { |
| 2248 | printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); |
| 2249 | return; |
| 2250 | } |
| 2251 | } |
| 2252 | } |
| 2253 | |
| 2254 | /* |
| 2255 | * idetape_queue_rw_tail generates a read/write request for the block |
| 2256 | * device interface and wait for it to be serviced. |
| 2257 | */ |
| 2258 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) |
| 2259 | { |
| 2260 | idetape_tape_t *tape = drive->driver_data; |
| 2261 | struct request rq; |
| 2262 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2263 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
| 2264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | if (idetape_pipeline_active(tape)) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2266 | printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n", |
| 2267 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | return (0); |
| 2269 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | |
| 2271 | idetape_init_rq(&rq, cmd); |
| 2272 | rq.rq_disk = tape->disk; |
| 2273 | rq.special = (void *)bh; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2274 | rq.sector = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | rq.nr_sectors = rq.current_nr_sectors = blocks; |
| 2276 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); |
| 2277 | |
| 2278 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) |
| 2279 | return 0; |
| 2280 | |
| 2281 | if (tape->merge_stage) |
| 2282 | idetape_init_merge_stage(tape); |
| 2283 | if (rq.errors == IDETAPE_ERROR_GENERAL) |
| 2284 | return -EIO; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2285 | return (tape->blk_size * (blocks-rq.current_nr_sectors)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | } |
| 2287 | |
| 2288 | /* |
| 2289 | * idetape_insert_pipeline_into_queue is used to start servicing the |
| 2290 | * pipeline stages, starting from tape->next_stage. |
| 2291 | */ |
| 2292 | static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) |
| 2293 | { |
| 2294 | idetape_tape_t *tape = drive->driver_data; |
| 2295 | |
| 2296 | if (tape->next_stage == NULL) |
| 2297 | return; |
| 2298 | if (!idetape_pipeline_active(tape)) { |
| 2299 | set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
Borislav Petkov | 419d474 | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2300 | idetape_activate_next_stage(drive); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2301 | (void) ide_do_drive_cmd(drive, tape->active_data_rq, ide_end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | } |
| 2303 | } |
| 2304 | |
| 2305 | static void idetape_create_inquiry_cmd (idetape_pc_t *pc) |
| 2306 | { |
| 2307 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2308 | pc->c[0] = INQUIRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | pc->c[4] = pc->request_transfer = 254; |
| 2310 | pc->callback = &idetape_pc_callback; |
| 2311 | } |
| 2312 | |
| 2313 | static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) |
| 2314 | { |
| 2315 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2316 | pc->c[0] = REZERO_UNIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2318 | pc->callback = &idetape_pc_callback; |
| 2319 | } |
| 2320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | static void idetape_create_erase_cmd (idetape_pc_t *pc) |
| 2322 | { |
| 2323 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2324 | pc->c[0] = ERASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | pc->c[1] = 1; |
| 2326 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2327 | pc->callback = &idetape_pc_callback; |
| 2328 | } |
| 2329 | |
| 2330 | static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) |
| 2331 | { |
| 2332 | idetape_init_pc(pc); |
Borislav Petkov | 90699ce | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2333 | pc->c[0] = SPACE; |
Borislav Petkov | 860ff5e | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 2334 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | pc->c[1] = cmd; |
| 2336 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2337 | pc->callback = &idetape_pc_callback; |
| 2338 | } |
| 2339 | |
| 2340 | static void idetape_wait_first_stage (ide_drive_t *drive) |
| 2341 | { |
| 2342 | idetape_tape_t *tape = drive->driver_data; |
| 2343 | unsigned long flags; |
| 2344 | |
| 2345 | if (tape->first_stage == NULL) |
| 2346 | return; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2347 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | if (tape->active_stage == tape->first_stage) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2349 | idetape_wait_for_request(drive, tape->active_data_rq); |
| 2350 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | } |
| 2352 | |
| 2353 | /* |
| 2354 | * idetape_add_chrdev_write_request tries to add a character device |
| 2355 | * originated write request to our pipeline. In case we don't succeed, |
| 2356 | * we revert to non-pipelined operation mode for this request. |
| 2357 | * |
| 2358 | * 1. Try to allocate a new pipeline stage. |
| 2359 | * 2. If we can't, wait for more and more requests to be serviced |
| 2360 | * and try again each time. |
| 2361 | * 3. If we still can't allocate a stage, fallback to |
| 2362 | * non-pipelined operation mode for this request. |
| 2363 | */ |
| 2364 | static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) |
| 2365 | { |
| 2366 | idetape_tape_t *tape = drive->driver_data; |
| 2367 | idetape_stage_t *new_stage; |
| 2368 | unsigned long flags; |
| 2369 | struct request *rq; |
| 2370 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2371 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | |
| 2373 | /* |
| 2374 | * Attempt to allocate a new stage. |
| 2375 | * Pay special attention to possible race conditions. |
| 2376 | */ |
| 2377 | while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2378 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | if (idetape_pipeline_active(tape)) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2380 | idetape_wait_for_request(drive, tape->active_data_rq); |
| 2381 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | } else { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2383 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | idetape_insert_pipeline_into_queue(drive); |
| 2385 | if (idetape_pipeline_active(tape)) |
| 2386 | continue; |
| 2387 | /* |
| 2388 | * Linux is short on memory. Fallback to |
| 2389 | * non-pipelined operation mode for this request. |
| 2390 | */ |
| 2391 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); |
| 2392 | } |
| 2393 | } |
| 2394 | rq = &new_stage->rq; |
| 2395 | idetape_init_rq(rq, REQ_IDETAPE_WRITE); |
| 2396 | /* Doesn't actually matter - We always assume sequential access */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2397 | rq->sector = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | rq->nr_sectors = rq->current_nr_sectors = blocks; |
| 2399 | |
| 2400 | idetape_switch_buffers(tape, new_stage); |
| 2401 | idetape_add_stage_tail(drive, new_stage); |
| 2402 | tape->pipeline_head++; |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2403 | idetape_calculate_speeds(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | |
| 2405 | /* |
| 2406 | * Estimate whether the tape has stopped writing by checking |
| 2407 | * if our write pipeline is currently empty. If we are not |
| 2408 | * writing anymore, wait for the pipeline to be full enough |
| 2409 | * (90%) before starting to service requests, so that we will |
| 2410 | * be able to keep up with the higher speeds of the tape. |
| 2411 | */ |
| 2412 | if (!idetape_pipeline_active(tape)) { |
| 2413 | if (tape->nr_stages >= tape->max_stages * 9 / 10 || |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2414 | tape->nr_stages >= tape->max_stages - |
| 2415 | tape->uncontrolled_pipeline_head_speed * 3 * 1024 / |
| 2416 | tape->blk_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | tape->measure_insert_time = 1; |
| 2418 | tape->insert_time = jiffies; |
| 2419 | tape->insert_size = 0; |
| 2420 | tape->insert_speed = 0; |
| 2421 | idetape_insert_pipeline_into_queue(drive); |
| 2422 | } |
| 2423 | } |
| 2424 | if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) |
| 2425 | /* Return a deferred error */ |
| 2426 | return -EIO; |
| 2427 | return blocks; |
| 2428 | } |
| 2429 | |
| 2430 | /* |
| 2431 | * idetape_wait_for_pipeline will wait until all pending pipeline |
| 2432 | * requests are serviced. Typically called on device close. |
| 2433 | */ |
| 2434 | static void idetape_wait_for_pipeline (ide_drive_t *drive) |
| 2435 | { |
| 2436 | idetape_tape_t *tape = drive->driver_data; |
| 2437 | unsigned long flags; |
| 2438 | |
| 2439 | while (tape->next_stage || idetape_pipeline_active(tape)) { |
| 2440 | idetape_insert_pipeline_into_queue(drive); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2441 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | if (idetape_pipeline_active(tape)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2443 | idetape_wait_for_request(drive, tape->active_data_rq); |
| 2444 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | } |
| 2446 | } |
| 2447 | |
| 2448 | static void idetape_empty_write_pipeline (ide_drive_t *drive) |
| 2449 | { |
| 2450 | idetape_tape_t *tape = drive->driver_data; |
| 2451 | int blocks, min; |
| 2452 | struct idetape_bh *bh; |
Borislav Petkov | 55a5d29 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2453 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2454 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); |
| 2456 | return; |
| 2457 | } |
| 2458 | if (tape->merge_stage_size > tape->stage_size) { |
| 2459 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
| 2460 | tape->merge_stage_size = tape->stage_size; |
| 2461 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | if (tape->merge_stage_size) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2463 | blocks = tape->merge_stage_size / tape->blk_size; |
| 2464 | if (tape->merge_stage_size % tape->blk_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | unsigned int i; |
| 2466 | |
| 2467 | blocks++; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2468 | i = tape->blk_size - tape->merge_stage_size % |
| 2469 | tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | bh = tape->bh->b_reqnext; |
| 2471 | while (bh) { |
| 2472 | atomic_set(&bh->b_count, 0); |
| 2473 | bh = bh->b_reqnext; |
| 2474 | } |
| 2475 | bh = tape->bh; |
| 2476 | while (i) { |
| 2477 | if (bh == NULL) { |
| 2478 | |
| 2479 | printk(KERN_INFO "ide-tape: bug, bh NULL\n"); |
| 2480 | break; |
| 2481 | } |
| 2482 | min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); |
| 2483 | memset(bh->b_data + atomic_read(&bh->b_count), 0, min); |
| 2484 | atomic_add(min, &bh->b_count); |
| 2485 | i -= min; |
| 2486 | bh = bh->b_reqnext; |
| 2487 | } |
| 2488 | } |
| 2489 | (void) idetape_add_chrdev_write_request(drive, blocks); |
| 2490 | tape->merge_stage_size = 0; |
| 2491 | } |
| 2492 | idetape_wait_for_pipeline(drive); |
| 2493 | if (tape->merge_stage != NULL) { |
| 2494 | __idetape_kfree_stage(tape->merge_stage); |
| 2495 | tape->merge_stage = NULL; |
| 2496 | } |
| 2497 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2498 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | |
| 2500 | /* |
| 2501 | * On the next backup, perform the feedback loop again. |
| 2502 | * (I don't want to keep sense information between backups, |
| 2503 | * as some systems are constantly on, and the system load |
| 2504 | * can be totally different on the next backup). |
| 2505 | */ |
| 2506 | tape->max_stages = tape->min_pipeline; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2507 | if (tape->first_stage != NULL || |
| 2508 | tape->next_stage != NULL || |
| 2509 | tape->last_stage != NULL || |
| 2510 | tape->nr_stages != 0) { |
| 2511 | printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " |
| 2512 | "first_stage %p, next_stage %p, " |
| 2513 | "last_stage %p, nr_stages %d\n", |
| 2514 | tape->first_stage, tape->next_stage, |
| 2515 | tape->last_stage, tape->nr_stages); |
| 2516 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | } |
| 2518 | |
| 2519 | static void idetape_restart_speed_control (ide_drive_t *drive) |
| 2520 | { |
| 2521 | idetape_tape_t *tape = drive->driver_data; |
| 2522 | |
| 2523 | tape->restart_speed_control_req = 0; |
| 2524 | tape->pipeline_head = 0; |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2525 | tape->controlled_last_pipeline_head = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; |
| 2527 | tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; |
| 2528 | tape->uncontrolled_pipeline_head_speed = 0; |
| 2529 | tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; |
| 2530 | tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; |
| 2531 | } |
| 2532 | |
| 2533 | static int idetape_initiate_read (ide_drive_t *drive, int max_stages) |
| 2534 | { |
| 2535 | idetape_tape_t *tape = drive->driver_data; |
| 2536 | idetape_stage_t *new_stage; |
| 2537 | struct request rq; |
| 2538 | int bytes_read; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2539 | u16 blocks = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | |
| 2541 | /* Initialize read operation */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2542 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
| 2543 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2544 | idetape_empty_write_pipeline(drive); |
| 2545 | idetape_flush_tape_buffers(drive); |
| 2546 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | if (tape->merge_stage || tape->merge_stage_size) { |
| 2548 | printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); |
| 2549 | tape->merge_stage_size = 0; |
| 2550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) |
| 2552 | return -ENOMEM; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2553 | tape->chrdev_dir = IDETAPE_DIR_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | |
| 2555 | /* |
| 2556 | * Issue a read 0 command to ensure that DSC handshake |
| 2557 | * is switched from completion mode to buffer available |
| 2558 | * mode. |
| 2559 | * No point in issuing this if DSC overlap isn't supported, |
| 2560 | * some drives (Seagate STT3401A) will return an error. |
| 2561 | */ |
| 2562 | if (drive->dsc_overlap) { |
| 2563 | bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); |
| 2564 | if (bytes_read < 0) { |
| 2565 | __idetape_kfree_stage(tape->merge_stage); |
| 2566 | tape->merge_stage = NULL; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2567 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2568 | return bytes_read; |
| 2569 | } |
| 2570 | } |
| 2571 | } |
| 2572 | if (tape->restart_speed_control_req) |
| 2573 | idetape_restart_speed_control(drive); |
| 2574 | idetape_init_rq(&rq, REQ_IDETAPE_READ); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2575 | rq.sector = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | rq.nr_sectors = rq.current_nr_sectors = blocks; |
| 2577 | if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && |
| 2578 | tape->nr_stages < max_stages) { |
| 2579 | new_stage = idetape_kmalloc_stage(tape); |
| 2580 | while (new_stage != NULL) { |
| 2581 | new_stage->rq = rq; |
| 2582 | idetape_add_stage_tail(drive, new_stage); |
| 2583 | if (tape->nr_stages >= max_stages) |
| 2584 | break; |
| 2585 | new_stage = idetape_kmalloc_stage(tape); |
| 2586 | } |
| 2587 | } |
| 2588 | if (!idetape_pipeline_active(tape)) { |
| 2589 | if (tape->nr_pending_stages >= 3 * max_stages / 4) { |
| 2590 | tape->measure_insert_time = 1; |
| 2591 | tape->insert_time = jiffies; |
| 2592 | tape->insert_size = 0; |
| 2593 | tape->insert_speed = 0; |
| 2594 | idetape_insert_pipeline_into_queue(drive); |
| 2595 | } |
| 2596 | } |
| 2597 | return 0; |
| 2598 | } |
| 2599 | |
| 2600 | /* |
| 2601 | * idetape_add_chrdev_read_request is called from idetape_chrdev_read |
| 2602 | * to service a character device read request and add read-ahead |
| 2603 | * requests to our pipeline. |
| 2604 | */ |
| 2605 | static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) |
| 2606 | { |
| 2607 | idetape_tape_t *tape = drive->driver_data; |
| 2608 | unsigned long flags; |
| 2609 | struct request *rq_ptr; |
| 2610 | int bytes_read; |
| 2611 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2612 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2613 | |
| 2614 | /* |
| 2615 | * If we are at a filemark, return a read length of 0 |
| 2616 | */ |
| 2617 | if (test_bit(IDETAPE_FILEMARK, &tape->flags)) |
| 2618 | return 0; |
| 2619 | |
| 2620 | /* |
| 2621 | * Wait for the next block to be available at the head |
| 2622 | * of the pipeline |
| 2623 | */ |
| 2624 | idetape_initiate_read(drive, tape->max_stages); |
| 2625 | if (tape->first_stage == NULL) { |
| 2626 | if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) |
| 2627 | return 0; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2628 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
| 2629 | tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | } |
| 2631 | idetape_wait_first_stage(drive); |
| 2632 | rq_ptr = &tape->first_stage->rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2633 | bytes_read = tape->blk_size * (rq_ptr->nr_sectors - |
| 2634 | rq_ptr->current_nr_sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2635 | rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; |
| 2636 | |
| 2637 | |
| 2638 | if (rq_ptr->errors == IDETAPE_ERROR_EOD) |
| 2639 | return 0; |
| 2640 | else { |
| 2641 | idetape_switch_buffers(tape, tape->first_stage); |
| 2642 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) |
| 2643 | set_bit(IDETAPE_FILEMARK, &tape->flags); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2644 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2645 | idetape_remove_stage_head(drive); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2646 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2647 | tape->pipeline_head++; |
Borislav Petkov | 37016ba | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2648 | idetape_calculate_speeds(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2649 | } |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2650 | if (bytes_read > blocks * tape->blk_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2652 | bytes_read = blocks * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2653 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | return (bytes_read); |
| 2655 | } |
| 2656 | |
| 2657 | static void idetape_pad_zeros (ide_drive_t *drive, int bcount) |
| 2658 | { |
| 2659 | idetape_tape_t *tape = drive->driver_data; |
| 2660 | struct idetape_bh *bh; |
| 2661 | int blocks; |
| 2662 | |
| 2663 | while (bcount) { |
| 2664 | unsigned int count; |
| 2665 | |
| 2666 | bh = tape->merge_stage->bh; |
| 2667 | count = min(tape->stage_size, bcount); |
| 2668 | bcount -= count; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2669 | blocks = count / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | while (count) { |
| 2671 | atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); |
| 2672 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
| 2673 | count -= atomic_read(&bh->b_count); |
| 2674 | bh = bh->b_reqnext; |
| 2675 | } |
| 2676 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); |
| 2677 | } |
| 2678 | } |
| 2679 | |
| 2680 | static int idetape_pipeline_size (ide_drive_t *drive) |
| 2681 | { |
| 2682 | idetape_tape_t *tape = drive->driver_data; |
| 2683 | idetape_stage_t *stage; |
| 2684 | struct request *rq; |
| 2685 | int size = 0; |
| 2686 | |
| 2687 | idetape_wait_for_pipeline(drive); |
| 2688 | stage = tape->first_stage; |
| 2689 | while (stage != NULL) { |
| 2690 | rq = &stage->rq; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2691 | size += tape->blk_size * (rq->nr_sectors - |
| 2692 | rq->current_nr_sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2693 | if (rq->errors == IDETAPE_ERROR_FILEMARK) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2694 | size += tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | stage = stage->next; |
| 2696 | } |
| 2697 | size += tape->merge_stage_size; |
| 2698 | return size; |
| 2699 | } |
| 2700 | |
| 2701 | /* |
| 2702 | * Rewinds the tape to the Beginning Of the current Partition (BOP). |
| 2703 | * |
| 2704 | * We currently support only one partition. |
| 2705 | */ |
| 2706 | static int idetape_rewind_tape (ide_drive_t *drive) |
| 2707 | { |
| 2708 | int retval; |
| 2709 | idetape_pc_t pc; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2710 | idetape_tape_t *tape; |
| 2711 | tape = drive->driver_data; |
| 2712 | |
| 2713 | debug_log(DBG_SENSE, "Enter %s\n", __func__); |
| 2714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | idetape_create_rewind_cmd(drive, &pc); |
| 2716 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2717 | if (retval) |
| 2718 | return retval; |
| 2719 | |
| 2720 | idetape_create_read_position_cmd(&pc); |
| 2721 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2722 | if (retval) |
| 2723 | return retval; |
| 2724 | return 0; |
| 2725 | } |
| 2726 | |
| 2727 | /* |
| 2728 | * Our special ide-tape ioctl's. |
| 2729 | * |
| 2730 | * Currently there aren't any ioctl's. |
| 2731 | * mtio.h compatible commands should be issued to the character device |
| 2732 | * interface. |
| 2733 | */ |
| 2734 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) |
| 2735 | { |
| 2736 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | void __user *argp = (void __user *)arg; |
| 2738 | |
Borislav Petkov | d59823f | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2739 | struct idetape_config { |
| 2740 | int dsc_rw_frequency; |
| 2741 | int dsc_media_access_frequency; |
| 2742 | int nr_stages; |
| 2743 | } config; |
| 2744 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2745 | debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| 2746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | switch (cmd) { |
| 2748 | case 0x0340: |
Borislav Petkov | d59823f | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2749 | if (copy_from_user(&config, argp, sizeof(config))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2750 | return -EFAULT; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2751 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | tape->max_stages = config.nr_stages; |
| 2753 | break; |
| 2754 | case 0x0350: |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2755 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2756 | config.nr_stages = tape->max_stages; |
Borislav Petkov | d59823f | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 2757 | if (copy_to_user(argp, &config, sizeof(config))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | return -EFAULT; |
| 2759 | break; |
| 2760 | default: |
| 2761 | return -EIO; |
| 2762 | } |
| 2763 | return 0; |
| 2764 | } |
| 2765 | |
| 2766 | /* |
| 2767 | * idetape_space_over_filemarks is now a bit more complicated than just |
| 2768 | * passing the command to the tape since we may have crossed some |
| 2769 | * filemarks during our pipelined read-ahead mode. |
| 2770 | * |
| 2771 | * As a minor side effect, the pipeline enables us to support MTFSFM when |
| 2772 | * the filemark is in our internal pipeline even if the tape doesn't |
| 2773 | * support spacing over filemarks in the reverse direction. |
| 2774 | */ |
| 2775 | static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) |
| 2776 | { |
| 2777 | idetape_tape_t *tape = drive->driver_data; |
| 2778 | idetape_pc_t pc; |
| 2779 | unsigned long flags; |
| 2780 | int retval,count=0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2781 | int sprev = !!(tape->caps[4] & 0x20); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | |
| 2783 | if (mt_count == 0) |
| 2784 | return 0; |
| 2785 | if (MTBSF == mt_op || MTBSFM == mt_op) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2786 | if (!sprev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | return -EIO; |
| 2788 | mt_count = - mt_count; |
| 2789 | } |
| 2790 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2791 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | /* |
| 2793 | * We have a read-ahead buffer. Scan it for crossed |
| 2794 | * filemarks. |
| 2795 | */ |
| 2796 | tape->merge_stage_size = 0; |
| 2797 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) |
| 2798 | ++count; |
| 2799 | while (tape->first_stage != NULL) { |
| 2800 | if (count == mt_count) { |
| 2801 | if (mt_op == MTFSFM) |
| 2802 | set_bit(IDETAPE_FILEMARK, &tape->flags); |
| 2803 | return 0; |
| 2804 | } |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2805 | spin_lock_irqsave(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2806 | if (tape->first_stage == tape->active_stage) { |
| 2807 | /* |
| 2808 | * We have reached the active stage in the read pipeline. |
| 2809 | * There is no point in allowing the drive to continue |
| 2810 | * reading any farther, so we stop the pipeline. |
| 2811 | * |
| 2812 | * This section should be moved to a separate subroutine, |
| 2813 | * because a similar function is performed in |
| 2814 | * __idetape_discard_read_pipeline(), for example. |
| 2815 | */ |
| 2816 | tape->next_stage = NULL; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2817 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2818 | idetape_wait_first_stage(drive); |
| 2819 | tape->next_stage = tape->first_stage->next; |
| 2820 | } else |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2821 | spin_unlock_irqrestore(&tape->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2822 | if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) |
| 2823 | ++count; |
| 2824 | idetape_remove_stage_head(drive); |
| 2825 | } |
| 2826 | idetape_discard_read_pipeline(drive, 0); |
| 2827 | } |
| 2828 | |
| 2829 | /* |
| 2830 | * The filemark was not found in our internal pipeline. |
| 2831 | * Now we can issue the space command. |
| 2832 | */ |
| 2833 | switch (mt_op) { |
| 2834 | case MTFSF: |
| 2835 | case MTBSF: |
| 2836 | idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); |
| 2837 | return (idetape_queue_pc_tail(drive, &pc)); |
| 2838 | case MTFSFM: |
| 2839 | case MTBSFM: |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2840 | if (!sprev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2841 | return (-EIO); |
| 2842 | retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); |
| 2843 | if (retval) return (retval); |
| 2844 | count = (MTBSFM == mt_op ? 1 : -1); |
| 2845 | return (idetape_space_over_filemarks(drive, MTFSF, count)); |
| 2846 | default: |
| 2847 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); |
| 2848 | return (-EIO); |
| 2849 | } |
| 2850 | } |
| 2851 | |
| 2852 | |
| 2853 | /* |
| 2854 | * Our character device read / write functions. |
| 2855 | * |
| 2856 | * The tape is optimized to maximize throughput when it is transferring |
| 2857 | * an integral number of the "continuous transfer limit", which is |
| 2858 | * a parameter of the specific tape (26 KB on my particular tape). |
| 2859 | * (32 kB for Onstream) |
| 2860 | * |
| 2861 | * As of version 1.3 of the driver, the character device provides an |
| 2862 | * abstract continuous view of the media - any mix of block sizes (even 1 |
| 2863 | * byte) on the same backup/restore procedure is supported. The driver |
| 2864 | * will internally convert the requests to the recommended transfer unit, |
| 2865 | * so that an unmatch between the user's block size to the recommended |
| 2866 | * size will only result in a (slightly) increased driver overhead, but |
| 2867 | * will no longer hit performance. |
| 2868 | * This is not applicable to Onstream. |
| 2869 | */ |
| 2870 | static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, |
| 2871 | size_t count, loff_t *ppos) |
| 2872 | { |
| 2873 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2874 | ide_drive_t *drive = tape->drive; |
| 2875 | ssize_t bytes_read,temp, actually_read = 0, rc; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2876 | ssize_t ret = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2877 | u16 ctl = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2878 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2879 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2880 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2881 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 2883 | if (count > tape->blk_size && |
| 2884 | (count % tape->blk_size) == 0) |
| 2885 | tape->user_bs_factor = count / tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | } |
| 2887 | if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) |
| 2888 | return rc; |
| 2889 | if (count == 0) |
| 2890 | return (0); |
| 2891 | if (tape->merge_stage_size) { |
| 2892 | actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2893 | if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read)) |
| 2894 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | buf += actually_read; |
| 2896 | tape->merge_stage_size -= actually_read; |
| 2897 | count -= actually_read; |
| 2898 | } |
| 2899 | while (count >= tape->stage_size) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2900 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | if (bytes_read <= 0) |
| 2902 | goto finish; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2903 | if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read)) |
| 2904 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | buf += bytes_read; |
| 2906 | count -= bytes_read; |
| 2907 | actually_read += bytes_read; |
| 2908 | } |
| 2909 | if (count) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2910 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2911 | if (bytes_read <= 0) |
| 2912 | goto finish; |
| 2913 | temp = min((unsigned long)count, (unsigned long)bytes_read); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2914 | if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp)) |
| 2915 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | actually_read += temp; |
| 2917 | tape->merge_stage_size = bytes_read-temp; |
| 2918 | } |
| 2919 | finish: |
| 2920 | if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2921 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
| 2922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2923 | idetape_space_over_filemarks(drive, MTFSF, 1); |
| 2924 | return 0; |
| 2925 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2926 | |
| 2927 | return (ret) ? ret : actually_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2928 | } |
| 2929 | |
| 2930 | static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, |
| 2931 | size_t count, loff_t *ppos) |
| 2932 | { |
| 2933 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 2934 | ide_drive_t *drive = tape->drive; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2935 | ssize_t actually_written = 0; |
| 2936 | ssize_t ret = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2937 | u16 ctl = *(u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2938 | |
| 2939 | /* The drive is write protected. */ |
| 2940 | if (tape->write_prot) |
| 2941 | return -EACCES; |
| 2942 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 2943 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | |
| 2945 | /* Initialize write operation */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2946 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
| 2947 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2948 | idetape_discard_read_pipeline(drive, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2949 | if (tape->merge_stage || tape->merge_stage_size) { |
| 2950 | printk(KERN_ERR "ide-tape: merge_stage_size " |
| 2951 | "should be 0 now\n"); |
| 2952 | tape->merge_stage_size = 0; |
| 2953 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2954 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) |
| 2955 | return -ENOMEM; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2956 | tape->chrdev_dir = IDETAPE_DIR_WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | idetape_init_merge_stage(tape); |
| 2958 | |
| 2959 | /* |
| 2960 | * Issue a write 0 command to ensure that DSC handshake |
| 2961 | * is switched from completion mode to buffer available |
| 2962 | * mode. |
| 2963 | * No point in issuing this if DSC overlap isn't supported, |
| 2964 | * some drives (Seagate STT3401A) will return an error. |
| 2965 | */ |
| 2966 | if (drive->dsc_overlap) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2967 | ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2968 | if (retval < 0) { |
| 2969 | __idetape_kfree_stage(tape->merge_stage); |
| 2970 | tape->merge_stage = NULL; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 2971 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2972 | return retval; |
| 2973 | } |
| 2974 | } |
| 2975 | } |
| 2976 | if (count == 0) |
| 2977 | return (0); |
| 2978 | if (tape->restart_speed_control_req) |
| 2979 | idetape_restart_speed_control(drive); |
| 2980 | if (tape->merge_stage_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2981 | if (tape->merge_stage_size >= tape->stage_size) { |
| 2982 | printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); |
| 2983 | tape->merge_stage_size = 0; |
| 2984 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2986 | if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written)) |
| 2987 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2988 | buf += actually_written; |
| 2989 | tape->merge_stage_size += actually_written; |
| 2990 | count -= actually_written; |
| 2991 | |
| 2992 | if (tape->merge_stage_size == tape->stage_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2993 | ssize_t retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2994 | tape->merge_stage_size = 0; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 2995 | retval = idetape_add_chrdev_write_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2996 | if (retval <= 0) |
| 2997 | return (retval); |
| 2998 | } |
| 2999 | } |
| 3000 | while (count >= tape->stage_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3001 | ssize_t retval; |
| 3002 | if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size)) |
| 3003 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3004 | buf += tape->stage_size; |
| 3005 | count -= tape->stage_size; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3006 | retval = idetape_add_chrdev_write_request(drive, ctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3007 | actually_written += tape->stage_size; |
| 3008 | if (retval <= 0) |
| 3009 | return (retval); |
| 3010 | } |
| 3011 | if (count) { |
| 3012 | actually_written += count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3013 | if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count)) |
| 3014 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | tape->merge_stage_size += count; |
| 3016 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3017 | return (ret) ? ret : actually_written; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3018 | } |
| 3019 | |
| 3020 | static int idetape_write_filemark (ide_drive_t *drive) |
| 3021 | { |
| 3022 | idetape_pc_t pc; |
| 3023 | |
| 3024 | /* Write a filemark */ |
| 3025 | idetape_create_write_filemark_cmd(drive, &pc, 1); |
| 3026 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 3027 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
| 3028 | return -EIO; |
| 3029 | } |
| 3030 | return 0; |
| 3031 | } |
| 3032 | |
| 3033 | /* |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3034 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
| 3035 | * requested. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3037 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
| 3038 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also |
| 3039 | * usually not supported (it is supported in the rare case in which we crossed |
| 3040 | * the filemark during our read-ahead pipelined operation mode). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3041 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3042 | * The following commands are currently not supported: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | * |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3044 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
| 3045 | * MT_ST_WRITE_THRESHOLD. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | */ |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3047 | 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] | 3048 | { |
| 3049 | idetape_tape_t *tape = drive->driver_data; |
| 3050 | idetape_pc_t pc; |
| 3051 | int i,retval; |
| 3052 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 3053 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
| 3054 | mt_op, mt_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | /* |
| 3056 | * Commands which need our pipelined read-ahead stages. |
| 3057 | */ |
| 3058 | switch (mt_op) { |
| 3059 | case MTFSF: |
| 3060 | case MTFSFM: |
| 3061 | case MTBSF: |
| 3062 | case MTBSFM: |
| 3063 | if (!mt_count) |
| 3064 | return (0); |
| 3065 | return (idetape_space_over_filemarks(drive,mt_op,mt_count)); |
| 3066 | default: |
| 3067 | break; |
| 3068 | } |
| 3069 | switch (mt_op) { |
| 3070 | case MTWEOF: |
| 3071 | if (tape->write_prot) |
| 3072 | return -EACCES; |
| 3073 | idetape_discard_read_pipeline(drive, 1); |
| 3074 | for (i = 0; i < mt_count; i++) { |
| 3075 | retval = idetape_write_filemark(drive); |
| 3076 | if (retval) |
| 3077 | return retval; |
| 3078 | } |
| 3079 | return (0); |
| 3080 | case MTREW: |
| 3081 | idetape_discard_read_pipeline(drive, 0); |
| 3082 | if (idetape_rewind_tape(drive)) |
| 3083 | return -EIO; |
| 3084 | return 0; |
| 3085 | case MTLOAD: |
| 3086 | idetape_discard_read_pipeline(drive, 0); |
| 3087 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); |
| 3088 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3089 | case MTUNLOAD: |
| 3090 | case MTOFFL: |
| 3091 | /* |
| 3092 | * If door is locked, attempt to unlock before |
| 3093 | * attempting to eject. |
| 3094 | */ |
| 3095 | if (tape->door_locked) { |
| 3096 | if (idetape_create_prevent_cmd(drive, &pc, 0)) |
| 3097 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 3098 | tape->door_locked = DOOR_UNLOCKED; |
| 3099 | } |
| 3100 | idetape_discard_read_pipeline(drive, 0); |
| 3101 | idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); |
| 3102 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3103 | if (!retval) |
| 3104 | clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); |
| 3105 | return retval; |
| 3106 | case MTNOP: |
| 3107 | idetape_discard_read_pipeline(drive, 0); |
| 3108 | return (idetape_flush_tape_buffers(drive)); |
| 3109 | case MTRETEN: |
| 3110 | idetape_discard_read_pipeline(drive, 0); |
| 3111 | idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
| 3112 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3113 | case MTEOM: |
| 3114 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); |
| 3115 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3116 | case MTERASE: |
| 3117 | (void) idetape_rewind_tape(drive); |
| 3118 | idetape_create_erase_cmd(&pc); |
| 3119 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3120 | case MTSETBLK: |
| 3121 | if (mt_count) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3122 | if (mt_count < tape->blk_size || |
| 3123 | mt_count % tape->blk_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3124 | return -EIO; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3125 | tape->user_bs_factor = mt_count / |
| 3126 | tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | clear_bit(IDETAPE_DETECT_BS, &tape->flags); |
| 3128 | } else |
| 3129 | set_bit(IDETAPE_DETECT_BS, &tape->flags); |
| 3130 | return 0; |
| 3131 | case MTSEEK: |
| 3132 | idetape_discard_read_pipeline(drive, 0); |
| 3133 | return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); |
| 3134 | case MTSETPART: |
| 3135 | idetape_discard_read_pipeline(drive, 0); |
| 3136 | return (idetape_position_tape(drive, 0, mt_count, 0)); |
| 3137 | case MTFSR: |
| 3138 | case MTBSR: |
| 3139 | case MTLOCK: |
| 3140 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) |
| 3141 | return 0; |
| 3142 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3143 | if (retval) return retval; |
| 3144 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
| 3145 | return 0; |
| 3146 | case MTUNLOCK: |
| 3147 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) |
| 3148 | return 0; |
| 3149 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3150 | if (retval) return retval; |
| 3151 | tape->door_locked = DOOR_UNLOCKED; |
| 3152 | return 0; |
| 3153 | default: |
| 3154 | printk(KERN_ERR "ide-tape: MTIO operation %d not " |
| 3155 | "supported\n", mt_op); |
| 3156 | return (-EIO); |
| 3157 | } |
| 3158 | } |
| 3159 | |
| 3160 | /* |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3161 | * Our character device ioctls. General mtio.h magnetic io commands are |
| 3162 | * supported here, and not in the corresponding block interface. Our own |
| 3163 | * ide-tape ioctls are supported on both interfaces. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3164 | */ |
Borislav Petkov | d99c9da | 2008-02-02 19:56:51 +0100 | [diff] [blame] | 3165 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
| 3166 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3167 | { |
| 3168 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 3169 | ide_drive_t *drive = tape->drive; |
| 3170 | struct mtop mtop; |
| 3171 | struct mtget mtget; |
| 3172 | struct mtpos mtpos; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3173 | int block_offset = 0, position = tape->first_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3174 | void __user *argp = (void __user *)arg; |
| 3175 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 3176 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | |
| 3178 | tape->restart_speed_control_req = 1; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3179 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3180 | idetape_empty_write_pipeline(drive); |
| 3181 | idetape_flush_tape_buffers(drive); |
| 3182 | } |
| 3183 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3184 | block_offset = idetape_pipeline_size(drive) / |
| 3185 | (tape->blk_size * tape->user_bs_factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3186 | if ((position = idetape_read_position(drive)) < 0) |
| 3187 | return -EIO; |
| 3188 | } |
| 3189 | switch (cmd) { |
| 3190 | case MTIOCTOP: |
| 3191 | if (copy_from_user(&mtop, argp, sizeof (struct mtop))) |
| 3192 | return -EFAULT; |
| 3193 | return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); |
| 3194 | case MTIOCGET: |
| 3195 | memset(&mtget, 0, sizeof (struct mtget)); |
| 3196 | mtget.mt_type = MT_ISSCSI2; |
| 3197 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3198 | mtget.mt_dsreg = |
| 3199 | ((tape->blk_size * tape->user_bs_factor) |
| 3200 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
| 3201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3202 | if (tape->drv_write_prot) { |
| 3203 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); |
| 3204 | } |
| 3205 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) |
| 3206 | return -EFAULT; |
| 3207 | return 0; |
| 3208 | case MTIOCPOS: |
| 3209 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 3210 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) |
| 3211 | return -EFAULT; |
| 3212 | return 0; |
| 3213 | default: |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3214 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3215 | idetape_discard_read_pipeline(drive, 1); |
| 3216 | return idetape_blkdev_ioctl(drive, cmd, arg); |
| 3217 | } |
| 3218 | } |
| 3219 | |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 3220 | /* |
| 3221 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape |
| 3222 | * block size with the reported value. |
| 3223 | */ |
| 3224 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) |
| 3225 | { |
| 3226 | idetape_tape_t *tape = drive->driver_data; |
| 3227 | idetape_pc_t pc; |
| 3228 | |
| 3229 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); |
| 3230 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 3231 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3232 | if (tape->blk_size == 0) { |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 3233 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
| 3234 | "block size, assuming 32k\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3235 | tape->blk_size = 32768; |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 3236 | } |
| 3237 | return; |
| 3238 | } |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3239 | tape->blk_size = (pc.buffer[4 + 5] << 16) + |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 3240 | (pc.buffer[4 + 6] << 8) + |
| 3241 | pc.buffer[4 + 7]; |
| 3242 | tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7; |
| 3243 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3244 | |
| 3245 | /* |
| 3246 | * Our character device open function. |
| 3247 | */ |
| 3248 | static int idetape_chrdev_open (struct inode *inode, struct file *filp) |
| 3249 | { |
| 3250 | unsigned int minor = iminor(inode), i = minor & ~0xc0; |
| 3251 | ide_drive_t *drive; |
| 3252 | idetape_tape_t *tape; |
| 3253 | idetape_pc_t pc; |
| 3254 | int retval; |
| 3255 | |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 3256 | if (i >= MAX_HWIFS * MAX_DRIVES) |
| 3257 | return -ENXIO; |
| 3258 | |
| 3259 | tape = ide_tape_chrdev_get(i); |
| 3260 | if (!tape) |
| 3261 | return -ENXIO; |
| 3262 | |
| 3263 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
| 3264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | /* |
| 3266 | * We really want to do nonseekable_open(inode, filp); here, but some |
| 3267 | * versions of tar incorrectly call lseek on tapes and bail out if that |
| 3268 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
| 3269 | */ |
| 3270 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
| 3271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3272 | drive = tape->drive; |
| 3273 | |
| 3274 | filp->private_data = tape; |
| 3275 | |
| 3276 | if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { |
| 3277 | retval = -EBUSY; |
| 3278 | goto out_put_tape; |
| 3279 | } |
| 3280 | |
| 3281 | retval = idetape_wait_ready(drive, 60 * HZ); |
| 3282 | if (retval) { |
| 3283 | clear_bit(IDETAPE_BUSY, &tape->flags); |
| 3284 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
| 3285 | goto out_put_tape; |
| 3286 | } |
| 3287 | |
| 3288 | idetape_read_position(drive); |
| 3289 | if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) |
| 3290 | (void)idetape_rewind_tape(drive); |
| 3291 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3292 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3293 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 3294 | |
| 3295 | /* Read block size and write protect status from drive. */ |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 3296 | ide_tape_get_bsize_from_bdesc(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3297 | |
| 3298 | /* Set write protect flag if device is opened as read-only. */ |
| 3299 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) |
| 3300 | tape->write_prot = 1; |
| 3301 | else |
| 3302 | tape->write_prot = tape->drv_write_prot; |
| 3303 | |
| 3304 | /* Make sure drive isn't write protected if user wants to write. */ |
| 3305 | if (tape->write_prot) { |
| 3306 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || |
| 3307 | (filp->f_flags & O_ACCMODE) == O_RDWR) { |
| 3308 | clear_bit(IDETAPE_BUSY, &tape->flags); |
| 3309 | retval = -EROFS; |
| 3310 | goto out_put_tape; |
| 3311 | } |
| 3312 | } |
| 3313 | |
| 3314 | /* |
| 3315 | * Lock the tape drive door so user can't eject. |
| 3316 | */ |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3317 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3318 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
| 3319 | if (!idetape_queue_pc_tail(drive, &pc)) { |
| 3320 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
| 3321 | tape->door_locked = DOOR_LOCKED; |
| 3322 | } |
| 3323 | } |
| 3324 | } |
| 3325 | idetape_restart_speed_control(drive); |
| 3326 | tape->restart_speed_control_req = 0; |
| 3327 | return 0; |
| 3328 | |
| 3329 | out_put_tape: |
| 3330 | ide_tape_put(tape); |
| 3331 | return retval; |
| 3332 | } |
| 3333 | |
| 3334 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor) |
| 3335 | { |
| 3336 | idetape_tape_t *tape = drive->driver_data; |
| 3337 | |
| 3338 | idetape_empty_write_pipeline(drive); |
| 3339 | tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); |
| 3340 | if (tape->merge_stage != NULL) { |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3341 | idetape_pad_zeros(drive, tape->blk_size * |
| 3342 | (tape->user_bs_factor - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3343 | __idetape_kfree_stage(tape->merge_stage); |
| 3344 | tape->merge_stage = NULL; |
| 3345 | } |
| 3346 | idetape_write_filemark(drive); |
| 3347 | idetape_flush_tape_buffers(drive); |
| 3348 | idetape_flush_tape_buffers(drive); |
| 3349 | } |
| 3350 | |
| 3351 | /* |
| 3352 | * Our character device release function. |
| 3353 | */ |
| 3354 | static int idetape_chrdev_release (struct inode *inode, struct file *filp) |
| 3355 | { |
| 3356 | struct ide_tape_obj *tape = ide_tape_f(filp); |
| 3357 | ide_drive_t *drive = tape->drive; |
| 3358 | idetape_pc_t pc; |
| 3359 | unsigned int minor = iminor(inode); |
| 3360 | |
| 3361 | lock_kernel(); |
| 3362 | tape = drive->driver_data; |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 3363 | |
| 3364 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3365 | |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3366 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3367 | idetape_write_release(drive, minor); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3368 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3369 | if (minor < 128) |
| 3370 | idetape_discard_read_pipeline(drive, 1); |
| 3371 | else |
| 3372 | idetape_wait_for_pipeline(drive); |
| 3373 | } |
| 3374 | if (tape->cache_stage != NULL) { |
| 3375 | __idetape_kfree_stage(tape->cache_stage); |
| 3376 | tape->cache_stage = NULL; |
| 3377 | } |
| 3378 | if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) |
| 3379 | (void) idetape_rewind_tape(drive); |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3380 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3381 | if (tape->door_locked == DOOR_LOCKED) { |
| 3382 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { |
| 3383 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 3384 | tape->door_locked = DOOR_UNLOCKED; |
| 3385 | } |
| 3386 | } |
| 3387 | } |
| 3388 | clear_bit(IDETAPE_BUSY, &tape->flags); |
| 3389 | ide_tape_put(tape); |
| 3390 | unlock_kernel(); |
| 3391 | return 0; |
| 3392 | } |
| 3393 | |
| 3394 | /* |
| 3395 | * idetape_identify_device is called to check the contents of the |
| 3396 | * ATAPI IDENTIFY command results. We return: |
| 3397 | * |
| 3398 | * 1 If the tape can be supported by us, based on the information |
| 3399 | * we have so far. |
| 3400 | * |
| 3401 | * 0 If this tape driver is not currently supported by us. |
| 3402 | */ |
| 3403 | static int idetape_identify_device (ide_drive_t *drive) |
| 3404 | { |
| 3405 | struct idetape_id_gcw gcw; |
| 3406 | struct hd_driveid *id = drive->id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3407 | |
| 3408 | if (drive->id_read == 0) |
| 3409 | return 1; |
| 3410 | |
| 3411 | *((unsigned short *) &gcw) = id->config; |
| 3412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3413 | /* Check that we can support this device */ |
| 3414 | |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 3415 | if (gcw.protocol != 2) |
| 3416 | printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
| 3417 | gcw.protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3418 | else if (gcw.device_type != 1) |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 3419 | printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
| 3420 | "to tape\n", gcw.device_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3421 | else if (!gcw.removable) |
| 3422 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
| 3423 | else if (gcw.packet_size != 0) { |
Bartlomiej Zolnierkiewicz | 16422de3 | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 3424 | printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 " |
| 3425 | "bytes long\n", gcw.packet_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3426 | } else |
| 3427 | return 1; |
| 3428 | return 0; |
| 3429 | } |
| 3430 | |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3431 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3432 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3433 | idetape_tape_t *tape = drive->driver_data; |
| 3434 | idetape_pc_t pc; |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3435 | char fw_rev[6], vendor_id[10], product_id[18]; |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3437 | idetape_create_inquiry_cmd(&pc); |
| 3438 | if (idetape_queue_pc_tail(drive, &pc)) { |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3439 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
| 3440 | tape->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3441 | return; |
| 3442 | } |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3443 | memcpy(vendor_id, &pc.buffer[8], 8); |
| 3444 | memcpy(product_id, &pc.buffer[16], 16); |
| 3445 | memcpy(fw_rev, &pc.buffer[32], 4); |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3446 | |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3447 | ide_fixstring(vendor_id, 10, 0); |
| 3448 | ide_fixstring(product_id, 18, 0); |
| 3449 | ide_fixstring(fw_rev, 6, 0); |
| 3450 | |
Borislav Petkov | 6d29c8f | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3451 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
Borislav Petkov | 41f81d54 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3452 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3453 | } |
| 3454 | |
| 3455 | /* |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3456 | * Ask the tape about its various parameters. In particular, we will adjust our |
| 3457 | * 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] | 3458 | */ |
| 3459 | static void idetape_get_mode_sense_results (ide_drive_t *drive) |
| 3460 | { |
| 3461 | idetape_tape_t *tape = drive->driver_data; |
| 3462 | idetape_pc_t pc; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3463 | u8 *caps; |
| 3464 | u8 speed, max_speed; |
Borislav Petkov | 47314fa | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 3465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3466 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
| 3467 | if (idetape_queue_pc_tail(drive, &pc)) { |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3468 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
| 3469 | " some default values\n"); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3470 | tape->blk_size = 512; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3471 | put_unaligned(52, (u16 *)&tape->caps[12]); |
| 3472 | put_unaligned(540, (u16 *)&tape->caps[14]); |
| 3473 | put_unaligned(6*52, (u16 *)&tape->caps[16]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3474 | return; |
| 3475 | } |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3476 | caps = pc.buffer + 4 + pc.buffer[3]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3477 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3478 | /* convert to host order and save for later use */ |
| 3479 | speed = be16_to_cpu(*(u16 *)&caps[14]); |
| 3480 | max_speed = be16_to_cpu(*(u16 *)&caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3481 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3482 | put_unaligned(max_speed, (u16 *)&caps[8]); |
| 3483 | put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); |
| 3484 | put_unaligned(speed, (u16 *)&caps[14]); |
| 3485 | put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); |
| 3486 | |
| 3487 | if (!speed) { |
| 3488 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " |
| 3489 | "(assuming 650KB/sec)\n", drive->name); |
| 3490 | put_unaligned(650, (u16 *)&caps[14]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3491 | } |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3492 | if (!max_speed) { |
| 3493 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " |
| 3494 | "(assuming 650KB/sec)\n", drive->name); |
| 3495 | put_unaligned(650, (u16 *)&caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3496 | } |
| 3497 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3498 | memcpy(&tape->caps, caps, 20); |
| 3499 | if (caps[7] & 0x02) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3500 | tape->blk_size = 512; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3501 | else if (caps[7] & 0x04) |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3502 | tape->blk_size = 1024; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3503 | } |
| 3504 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3505 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3506 | static void idetape_add_settings (ide_drive_t *drive) |
| 3507 | { |
| 3508 | idetape_tape_t *tape = drive->driver_data; |
| 3509 | |
| 3510 | /* |
Bartlomiej Zolnierkiewicz | 1497943 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3511 | * drive setting name read/write data type min max mul_factor div_factor data pointer set function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3512 | */ |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3513 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 3514 | 1, 2, (u16 *)&tape->caps[16], NULL); |
Bartlomiej Zolnierkiewicz | 1497943 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3515 | ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); |
| 3516 | ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); |
| 3517 | ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); |
| 3518 | ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); |
| 3519 | ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3520 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 3521 | 1, 1, (u16 *)&tape->caps[14], NULL); |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3522 | ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, |
| 3523 | 1024, &tape->stage_size, NULL); |
| 3524 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
| 3525 | IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, |
| 3526 | NULL); |
Bartlomiej Zolnierkiewicz | 1497943 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3527 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); |
| 3528 | ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); |
| 3529 | ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL); |
| 3530 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); |
Borislav Petkov | 8004a8c | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 3531 | ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
| 3532 | 1, &tape->debug_mask, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3533 | } |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3534 | #else |
| 3535 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } |
| 3536 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | |
| 3538 | /* |
| 3539 | * ide_setup is called to: |
| 3540 | * |
| 3541 | * 1. Initialize our various state variables. |
| 3542 | * 2. Ask the tape for its capabilities. |
| 3543 | * 3. Allocate a buffer which will be used for data |
| 3544 | * transfer. The buffer size is chosen based on |
| 3545 | * the recommendation which we received in step (2). |
| 3546 | * |
| 3547 | * Note that at this point ide.c already assigned us an irq, so that |
| 3548 | * we can queue requests here and wait for their completion. |
| 3549 | */ |
| 3550 | static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) |
| 3551 | { |
| 3552 | unsigned long t1, tmid, tn, t; |
| 3553 | int speed; |
| 3554 | struct idetape_id_gcw gcw; |
| 3555 | int stage_size; |
| 3556 | struct sysinfo si; |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3557 | u16 *ctl = (u16 *)&tape->caps[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3558 | |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3559 | spin_lock_init(&tape->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3560 | drive->dsc_overlap = 1; |
Bartlomiej Zolnierkiewicz | 4166c19 | 2008-02-01 23:09:30 +0100 | [diff] [blame] | 3561 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
| 3562 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", |
| 3563 | tape->name); |
| 3564 | drive->dsc_overlap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3565 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3566 | /* Seagate Travan drives do not support DSC overlap. */ |
| 3567 | if (strstr(drive->id->model, "Seagate STT3401")) |
| 3568 | drive->dsc_overlap = 0; |
| 3569 | tape->minor = minor; |
| 3570 | tape->name[0] = 'h'; |
| 3571 | tape->name[1] = 't'; |
| 3572 | tape->name[2] = '0' + minor; |
Borislav Petkov | 54abf37 | 2008-02-06 02:57:52 +0100 | [diff] [blame] | 3573 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3574 | tape->pc = tape->pc_stack; |
| 3575 | tape->max_insert_speed = 10000; |
| 3576 | tape->speed_control = 1; |
| 3577 | *((unsigned short *) &gcw) = drive->id->config; |
| 3578 | if (gcw.drq_type == 1) |
| 3579 | set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); |
| 3580 | |
| 3581 | tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; |
| 3582 | |
| 3583 | idetape_get_inquiry_results(drive); |
| 3584 | idetape_get_mode_sense_results(drive); |
Borislav Petkov | 3cffb9c | 2008-02-02 19:56:50 +0100 | [diff] [blame] | 3585 | ide_tape_get_bsize_from_bdesc(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3586 | tape->user_bs_factor = 1; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3587 | tape->stage_size = *ctl * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3588 | while (tape->stage_size > 0xffff) { |
| 3589 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3590 | *ctl /= 2; |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3591 | tape->stage_size = *ctl * tape->blk_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3592 | } |
| 3593 | stage_size = tape->stage_size; |
| 3594 | tape->pages_per_stage = stage_size / PAGE_SIZE; |
| 3595 | if (stage_size % PAGE_SIZE) { |
| 3596 | tape->pages_per_stage++; |
| 3597 | tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; |
| 3598 | } |
| 3599 | |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3600 | /* Select the "best" DSC read/write polling freq and pipeline size. */ |
| 3601 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3602 | |
| 3603 | tape->max_stages = speed * 1000 * 10 / tape->stage_size; |
| 3604 | |
| 3605 | /* |
| 3606 | * Limit memory use for pipeline to 10% of physical memory |
| 3607 | */ |
| 3608 | si_meminfo(&si); |
| 3609 | if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) |
| 3610 | tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); |
| 3611 | tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); |
| 3612 | tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); |
| 3613 | tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); |
| 3614 | if (tape->max_stages == 0) |
| 3615 | tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; |
| 3616 | |
| 3617 | t1 = (tape->stage_size * HZ) / (speed * 1000); |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3618 | tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3619 | tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); |
| 3620 | |
| 3621 | if (tape->max_stages) |
| 3622 | t = tn; |
| 3623 | else |
| 3624 | t = t1; |
| 3625 | |
| 3626 | /* |
| 3627 | * Ensure that the number we got makes sense; limit |
| 3628 | * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
| 3629 | */ |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3630 | tape->best_dsc_rw_freq = max_t(unsigned long, |
| 3631 | min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), |
| 3632 | IDETAPE_DSC_RW_MIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3633 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
| 3634 | "%dkB pipeline, %lums tDSC%s\n", |
Borislav Petkov | b642201 | 2008-02-02 19:56:49 +0100 | [diff] [blame] | 3635 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
| 3636 | (*(u16 *)&tape->caps[16] * 512) / tape->stage_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3637 | tape->stage_size / 1024, |
| 3638 | tape->max_stages * tape->stage_size / 1024, |
Borislav Petkov | 54bb207 | 2008-02-06 02:57:52 +0100 | [diff] [blame^] | 3639 | tape->best_dsc_rw_freq * 1000 / HZ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3640 | drive->using_dma ? ", DMA":""); |
| 3641 | |
| 3642 | idetape_add_settings(drive); |
| 3643 | } |
| 3644 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3645 | static void ide_tape_remove(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3646 | { |
| 3647 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3648 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3649 | ide_proc_unregister_driver(drive, tape->driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3650 | |
| 3651 | ide_unregister_region(tape->disk); |
| 3652 | |
| 3653 | ide_tape_put(tape); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3654 | } |
| 3655 | |
| 3656 | static void ide_tape_release(struct kref *kref) |
| 3657 | { |
| 3658 | struct ide_tape_obj *tape = to_ide_tape(kref); |
| 3659 | ide_drive_t *drive = tape->drive; |
| 3660 | struct gendisk *g = tape->disk; |
| 3661 | |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3662 | BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); |
| 3663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3664 | drive->dsc_overlap = 0; |
| 3665 | drive->driver_data = NULL; |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 3666 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
| 3667 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3668 | idetape_devs[tape->minor] = NULL; |
| 3669 | g->private_data = NULL; |
| 3670 | put_disk(g); |
| 3671 | kfree(tape); |
| 3672 | } |
| 3673 | |
Bartlomiej Zolnierkiewicz | ecfd80e | 2007-05-10 00:01:09 +0200 | [diff] [blame] | 3674 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3675 | static int proc_idetape_read_name |
| 3676 | (char *page, char **start, off_t off, int count, int *eof, void *data) |
| 3677 | { |
| 3678 | ide_drive_t *drive = (ide_drive_t *) data; |
| 3679 | idetape_tape_t *tape = drive->driver_data; |
| 3680 | char *out = page; |
| 3681 | int len; |
| 3682 | |
| 3683 | len = sprintf(out, "%s\n", tape->name); |
| 3684 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); |
| 3685 | } |
| 3686 | |
| 3687 | static ide_proc_entry_t idetape_proc[] = { |
| 3688 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, |
| 3689 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, |
| 3690 | { NULL, 0, NULL, NULL } |
| 3691 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3692 | #endif |
| 3693 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3694 | static int ide_tape_probe(ide_drive_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3696 | static ide_driver_t idetape_driver = { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3697 | .gen_driver = { |
Laurent Riffard | 4ef3b8f | 2005-11-18 22:15:40 +0100 | [diff] [blame] | 3698 | .owner = THIS_MODULE, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3699 | .name = "ide-tape", |
| 3700 | .bus = &ide_bus_type, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3701 | }, |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3702 | .probe = ide_tape_probe, |
| 3703 | .remove = ide_tape_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3704 | .version = IDETAPE_VERSION, |
| 3705 | .media = ide_tape, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3706 | .supports_dsc_overlap = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3707 | .do_request = idetape_do_request, |
| 3708 | .end_request = idetape_end_request, |
| 3709 | .error = __ide_error, |
| 3710 | .abort = __ide_abort, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3711 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3712 | .proc = idetape_proc, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3713 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3714 | }; |
| 3715 | |
| 3716 | /* |
| 3717 | * Our character device supporting functions, passed to register_chrdev. |
| 3718 | */ |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 3719 | static const struct file_operations idetape_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3720 | .owner = THIS_MODULE, |
| 3721 | .read = idetape_chrdev_read, |
| 3722 | .write = idetape_chrdev_write, |
| 3723 | .ioctl = idetape_chrdev_ioctl, |
| 3724 | .open = idetape_chrdev_open, |
| 3725 | .release = idetape_chrdev_release, |
| 3726 | }; |
| 3727 | |
| 3728 | static int idetape_open(struct inode *inode, struct file *filp) |
| 3729 | { |
| 3730 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 3731 | struct ide_tape_obj *tape; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3732 | |
| 3733 | if (!(tape = ide_tape_get(disk))) |
| 3734 | return -ENXIO; |
| 3735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3736 | return 0; |
| 3737 | } |
| 3738 | |
| 3739 | static int idetape_release(struct inode *inode, struct file *filp) |
| 3740 | { |
| 3741 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 3742 | struct ide_tape_obj *tape = ide_tape_g(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3743 | |
| 3744 | ide_tape_put(tape); |
| 3745 | |
| 3746 | return 0; |
| 3747 | } |
| 3748 | |
| 3749 | static int idetape_ioctl(struct inode *inode, struct file *file, |
| 3750 | unsigned int cmd, unsigned long arg) |
| 3751 | { |
| 3752 | struct block_device *bdev = inode->i_bdev; |
| 3753 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); |
| 3754 | ide_drive_t *drive = tape->drive; |
| 3755 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); |
| 3756 | if (err == -EINVAL) |
| 3757 | err = idetape_blkdev_ioctl(drive, cmd, arg); |
| 3758 | return err; |
| 3759 | } |
| 3760 | |
| 3761 | static struct block_device_operations idetape_block_ops = { |
| 3762 | .owner = THIS_MODULE, |
| 3763 | .open = idetape_open, |
| 3764 | .release = idetape_release, |
| 3765 | .ioctl = idetape_ioctl, |
| 3766 | }; |
| 3767 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 3768 | static int ide_tape_probe(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3769 | { |
| 3770 | idetape_tape_t *tape; |
| 3771 | struct gendisk *g; |
| 3772 | int minor; |
| 3773 | |
| 3774 | if (!strstr("ide-tape", drive->driver_req)) |
| 3775 | goto failed; |
| 3776 | if (!drive->present) |
| 3777 | goto failed; |
| 3778 | if (drive->media != ide_tape) |
| 3779 | goto failed; |
| 3780 | if (!idetape_identify_device (drive)) { |
| 3781 | printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); |
| 3782 | goto failed; |
| 3783 | } |
| 3784 | if (drive->scsi) { |
| 3785 | printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); |
| 3786 | goto failed; |
| 3787 | } |
| 3788 | if (strstr(drive->id->model, "OnStream DI-")) { |
| 3789 | printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); |
| 3790 | printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); |
| 3791 | } |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 3792 | tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3793 | if (tape == NULL) { |
| 3794 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); |
| 3795 | goto failed; |
| 3796 | } |
| 3797 | |
| 3798 | g = alloc_disk(1 << PARTN_BITS); |
| 3799 | if (!g) |
| 3800 | goto out_free_tape; |
| 3801 | |
| 3802 | ide_init_disk(g, drive); |
| 3803 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 3804 | ide_proc_register_driver(drive, &idetape_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3806 | kref_init(&tape->kref); |
| 3807 | |
| 3808 | tape->drive = drive; |
| 3809 | tape->driver = &idetape_driver; |
| 3810 | tape->disk = g; |
| 3811 | |
| 3812 | g->private_data = &tape->driver; |
| 3813 | |
| 3814 | drive->driver_data = tape; |
| 3815 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 3816 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3817 | for (minor = 0; idetape_devs[minor]; minor++) |
| 3818 | ; |
| 3819 | idetape_devs[minor] = tape; |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 3820 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3821 | |
| 3822 | idetape_setup(drive, tape, minor); |
| 3823 | |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 3824 | device_create(idetape_sysfs_class, &drive->gendev, |
| 3825 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); |
| 3826 | device_create(idetape_sysfs_class, &drive->gendev, |
| 3827 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3829 | g->fops = &idetape_block_ops; |
| 3830 | ide_register_region(g); |
| 3831 | |
| 3832 | return 0; |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3834 | out_free_tape: |
| 3835 | kfree(tape); |
| 3836 | failed: |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3837 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3838 | } |
| 3839 | |
| 3840 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
| 3841 | MODULE_LICENSE("GPL"); |
| 3842 | |
| 3843 | static void __exit idetape_exit (void) |
| 3844 | { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 3845 | driver_unregister(&idetape_driver.gen_driver); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3846 | class_destroy(idetape_sysfs_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3847 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
| 3848 | } |
| 3849 | |
Bartlomiej Zolnierkiewicz | 17514e8 | 2005-11-19 22:24:35 +0100 | [diff] [blame] | 3850 | static int __init idetape_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3851 | { |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3852 | int error = 1; |
| 3853 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); |
| 3854 | if (IS_ERR(idetape_sysfs_class)) { |
| 3855 | idetape_sysfs_class = NULL; |
| 3856 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); |
| 3857 | error = -EBUSY; |
| 3858 | goto out; |
| 3859 | } |
| 3860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3861 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
| 3862 | printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3863 | error = -EBUSY; |
| 3864 | goto out_free_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3865 | } |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 3866 | |
| 3867 | error = driver_register(&idetape_driver.gen_driver); |
| 3868 | if (error) |
| 3869 | goto out_free_driver; |
| 3870 | |
| 3871 | return 0; |
| 3872 | |
| 3873 | out_free_driver: |
| 3874 | driver_unregister(&idetape_driver.gen_driver); |
| 3875 | out_free_class: |
| 3876 | class_destroy(idetape_sysfs_class); |
| 3877 | out: |
| 3878 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3879 | } |
| 3880 | |
Kay Sievers | 263756e | 2005-12-12 18:03:44 +0100 | [diff] [blame] | 3881 | MODULE_ALIAS("ide:*m-tape*"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3882 | module_init(idetape_init); |
| 3883 | module_exit(idetape_exit); |
| 3884 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |