| 1 | /* |
| 2 | * IDE I/O functions |
| 3 | * |
| 4 | * Basic PIO and command management functionality. |
| 5 | * |
| 6 | * This code was split off from ide.c. See ide.c for history and original |
| 7 | * copyrights. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the |
| 11 | * Free Software Foundation; either version 2, or (at your option) any |
| 12 | * later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * For the avoidance of doubt the "preferred form" of this code is one which |
| 20 | * is in an open non patent encumbered format. Where cryptographic key signing |
| 21 | * forms part of the process of creating an executable the information |
| 22 | * including keys needed to generate an equivalently functional executable |
| 23 | * are deemed to be part of the source code. |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/types.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/timer.h> |
| 32 | #include <linux/mm.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | #include <linux/major.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/genhd.h> |
| 37 | #include <linux/blkpg.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/pci.h> |
| 41 | #include <linux/delay.h> |
| 42 | #include <linux/ide.h> |
| 43 | #include <linux/hdreg.h> |
| 44 | #include <linux/completion.h> |
| 45 | #include <linux/reboot.h> |
| 46 | #include <linux/cdrom.h> |
| 47 | #include <linux/seq_file.h> |
| 48 | #include <linux/device.h> |
| 49 | #include <linux/kmod.h> |
| 50 | #include <linux/scatterlist.h> |
| 51 | #include <linux/bitops.h> |
| 52 | |
| 53 | #include <asm/byteorder.h> |
| 54 | #include <asm/irq.h> |
| 55 | #include <asm/uaccess.h> |
| 56 | #include <asm/io.h> |
| 57 | |
| 58 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
| 59 | int uptodate, unsigned int nr_bytes, int dequeue) |
| 60 | { |
| 61 | int ret = 1; |
| 62 | int error = 0; |
| 63 | |
| 64 | if (uptodate <= 0) |
| 65 | error = uptodate ? uptodate : -EIO; |
| 66 | |
| 67 | /* |
| 68 | * if failfast is set on a request, override number of sectors and |
| 69 | * complete the whole request right now |
| 70 | */ |
| 71 | if (blk_noretry_request(rq) && error) |
| 72 | nr_bytes = rq->hard_nr_sectors << 9; |
| 73 | |
| 74 | if (!blk_fs_request(rq) && error && !rq->errors) |
| 75 | rq->errors = -EIO; |
| 76 | |
| 77 | /* |
| 78 | * decide whether to reenable DMA -- 3 is a random magic for now, |
| 79 | * if we DMA timeout more than 3 times, just stay in PIO |
| 80 | */ |
| 81 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
| 82 | drive->retry_pio <= 3) { |
| 83 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; |
| 84 | ide_dma_on(drive); |
| 85 | } |
| 86 | |
| 87 | if (!blk_end_request(rq, error, nr_bytes)) |
| 88 | ret = 0; |
| 89 | |
| 90 | if (ret == 0 && dequeue) |
| 91 | drive->hwif->rq = NULL; |
| 92 | |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * ide_end_request - complete an IDE I/O |
| 98 | * @drive: IDE device for the I/O |
| 99 | * @uptodate: |
| 100 | * @nr_sectors: number of sectors completed |
| 101 | * |
| 102 | * This is our end_request wrapper function. We complete the I/O |
| 103 | * update random number input and dequeue the request, which if |
| 104 | * it was tagged may be out of order. |
| 105 | */ |
| 106 | |
| 107 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) |
| 108 | { |
| 109 | unsigned int nr_bytes = nr_sectors << 9; |
| 110 | struct request *rq = drive->hwif->rq; |
| 111 | |
| 112 | if (!nr_bytes) { |
| 113 | if (blk_pc_request(rq)) |
| 114 | nr_bytes = rq->data_len; |
| 115 | else |
| 116 | nr_bytes = rq->hard_cur_sectors << 9; |
| 117 | } |
| 118 | |
| 119 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
| 120 | } |
| 121 | EXPORT_SYMBOL(ide_end_request); |
| 122 | |
| 123 | /** |
| 124 | * ide_end_dequeued_request - complete an IDE I/O |
| 125 | * @drive: IDE device for the I/O |
| 126 | * @uptodate: |
| 127 | * @nr_sectors: number of sectors completed |
| 128 | * |
| 129 | * Complete an I/O that is no longer on the request queue. This |
| 130 | * typically occurs when we pull the request and issue a REQUEST_SENSE. |
| 131 | * We must still finish the old request but we must not tamper with the |
| 132 | * queue in the meantime. |
| 133 | * |
| 134 | * NOTE: This path does not handle barrier, but barrier is not supported |
| 135 | * on ide-cd anyway. |
| 136 | */ |
| 137 | |
| 138 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, |
| 139 | int uptodate, int nr_sectors) |
| 140 | { |
| 141 | BUG_ON(!blk_rq_started(rq)); |
| 142 | |
| 143 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
| 144 | } |
| 145 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); |
| 146 | |
| 147 | /** |
| 148 | * ide_end_drive_cmd - end an explicit drive command |
| 149 | * @drive: command |
| 150 | * @stat: status bits |
| 151 | * @err: error bits |
| 152 | * |
| 153 | * Clean up after success/failure of an explicit drive command. |
| 154 | * These get thrown onto the queue so they are synchronized with |
| 155 | * real I/O operations on the drive. |
| 156 | * |
| 157 | * In LBA48 mode we have to read the register set twice to get |
| 158 | * all the extra information out. |
| 159 | */ |
| 160 | |
| 161 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) |
| 162 | { |
| 163 | ide_hwif_t *hwif = drive->hwif; |
| 164 | struct request *rq = hwif->rq; |
| 165 | |
| 166 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
| 167 | ide_task_t *task = (ide_task_t *)rq->special; |
| 168 | |
| 169 | if (task) { |
| 170 | struct ide_taskfile *tf = &task->tf; |
| 171 | |
| 172 | tf->error = err; |
| 173 | tf->status = stat; |
| 174 | |
| 175 | drive->hwif->tp_ops->tf_read(drive, task); |
| 176 | |
| 177 | if (task->tf_flags & IDE_TFLAG_DYN) |
| 178 | kfree(task); |
| 179 | } |
| 180 | } else if (blk_pm_request(rq)) { |
| 181 | struct request_pm_state *pm = rq->data; |
| 182 | |
| 183 | ide_complete_power_step(drive, rq); |
| 184 | if (pm->pm_step == IDE_PM_COMPLETED) |
| 185 | ide_complete_pm_request(drive, rq); |
| 186 | return; |
| 187 | } |
| 188 | |
| 189 | hwif->rq = NULL; |
| 190 | |
| 191 | rq->errors = err; |
| 192 | |
| 193 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
| 194 | blk_rq_bytes(rq)))) |
| 195 | BUG(); |
| 196 | } |
| 197 | EXPORT_SYMBOL(ide_end_drive_cmd); |
| 198 | |
| 199 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
| 200 | { |
| 201 | if (rq->rq_disk) { |
| 202 | struct ide_driver *drv; |
| 203 | |
| 204 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
| 205 | drv->end_request(drive, 0, 0); |
| 206 | } else |
| 207 | ide_end_request(drive, 0, 0); |
| 208 | } |
| 209 | |
| 210 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
| 211 | { |
| 212 | ide_hwif_t *hwif = drive->hwif; |
| 213 | |
| 214 | if ((stat & ATA_BUSY) || |
| 215 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { |
| 216 | /* other bits are useless when BUSY */ |
| 217 | rq->errors |= ERROR_RESET; |
| 218 | } else if (stat & ATA_ERR) { |
| 219 | /* err has different meaning on cdrom and tape */ |
| 220 | if (err == ATA_ABORTED) { |
| 221 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
| 222 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
| 223 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) |
| 224 | return ide_stopped; |
| 225 | } else if ((err & BAD_CRC) == BAD_CRC) { |
| 226 | /* UDMA crc error, just retry the operation */ |
| 227 | drive->crc_count++; |
| 228 | } else if (err & (ATA_BBK | ATA_UNC)) { |
| 229 | /* retries won't help these */ |
| 230 | rq->errors = ERROR_MAX; |
| 231 | } else if (err & ATA_TRK0NF) { |
| 232 | /* help it find track zero */ |
| 233 | rq->errors |= ERROR_RECAL; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
| 238 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
| 239 | int nsect = drive->mult_count ? drive->mult_count : 1; |
| 240 | |
| 241 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); |
| 242 | } |
| 243 | |
| 244 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
| 245 | ide_kill_rq(drive, rq); |
| 246 | return ide_stopped; |
| 247 | } |
| 248 | |
| 249 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
| 250 | rq->errors |= ERROR_RESET; |
| 251 | |
| 252 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
| 253 | ++rq->errors; |
| 254 | return ide_do_reset(drive); |
| 255 | } |
| 256 | |
| 257 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) |
| 258 | drive->special.b.recalibrate = 1; |
| 259 | |
| 260 | ++rq->errors; |
| 261 | |
| 262 | return ide_stopped; |
| 263 | } |
| 264 | |
| 265 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
| 266 | { |
| 267 | ide_hwif_t *hwif = drive->hwif; |
| 268 | |
| 269 | if ((stat & ATA_BUSY) || |
| 270 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { |
| 271 | /* other bits are useless when BUSY */ |
| 272 | rq->errors |= ERROR_RESET; |
| 273 | } else { |
| 274 | /* add decoding error stuff */ |
| 275 | } |
| 276 | |
| 277 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
| 278 | /* force an abort */ |
| 279 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
| 280 | |
| 281 | if (rq->errors >= ERROR_MAX) { |
| 282 | ide_kill_rq(drive, rq); |
| 283 | } else { |
| 284 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
| 285 | ++rq->errors; |
| 286 | return ide_do_reset(drive); |
| 287 | } |
| 288 | ++rq->errors; |
| 289 | } |
| 290 | |
| 291 | return ide_stopped; |
| 292 | } |
| 293 | |
| 294 | static ide_startstop_t |
| 295 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
| 296 | { |
| 297 | if (drive->media == ide_disk) |
| 298 | return ide_ata_error(drive, rq, stat, err); |
| 299 | return ide_atapi_error(drive, rq, stat, err); |
| 300 | } |
| 301 | |
| 302 | /** |
| 303 | * ide_error - handle an error on the IDE |
| 304 | * @drive: drive the error occurred on |
| 305 | * @msg: message to report |
| 306 | * @stat: status bits |
| 307 | * |
| 308 | * ide_error() takes action based on the error returned by the drive. |
| 309 | * For normal I/O that may well include retries. We deal with |
| 310 | * both new-style (taskfile) and old style command handling here. |
| 311 | * In the case of taskfile command handling there is work left to |
| 312 | * do |
| 313 | */ |
| 314 | |
| 315 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) |
| 316 | { |
| 317 | struct request *rq; |
| 318 | u8 err; |
| 319 | |
| 320 | err = ide_dump_status(drive, msg, stat); |
| 321 | |
| 322 | rq = drive->hwif->rq; |
| 323 | if (rq == NULL) |
| 324 | return ide_stopped; |
| 325 | |
| 326 | /* retry only "normal" I/O: */ |
| 327 | if (!blk_fs_request(rq)) { |
| 328 | rq->errors = 1; |
| 329 | ide_end_drive_cmd(drive, stat, err); |
| 330 | return ide_stopped; |
| 331 | } |
| 332 | |
| 333 | return __ide_error(drive, rq, stat, err); |
| 334 | } |
| 335 | EXPORT_SYMBOL_GPL(ide_error); |
| 336 | |
| 337 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
| 338 | { |
| 339 | tf->nsect = drive->sect; |
| 340 | tf->lbal = drive->sect; |
| 341 | tf->lbam = drive->cyl; |
| 342 | tf->lbah = drive->cyl >> 8; |
| 343 | tf->device = (drive->head - 1) | drive->select; |
| 344 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
| 345 | } |
| 346 | |
| 347 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
| 348 | { |
| 349 | tf->nsect = drive->sect; |
| 350 | tf->command = ATA_CMD_RESTORE; |
| 351 | } |
| 352 | |
| 353 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
| 354 | { |
| 355 | tf->nsect = drive->mult_req; |
| 356 | tf->command = ATA_CMD_SET_MULTI; |
| 357 | } |
| 358 | |
| 359 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) |
| 360 | { |
| 361 | special_t *s = &drive->special; |
| 362 | ide_task_t args; |
| 363 | |
| 364 | memset(&args, 0, sizeof(ide_task_t)); |
| 365 | args.data_phase = TASKFILE_NO_DATA; |
| 366 | |
| 367 | if (s->b.set_geometry) { |
| 368 | s->b.set_geometry = 0; |
| 369 | ide_tf_set_specify_cmd(drive, &args.tf); |
| 370 | } else if (s->b.recalibrate) { |
| 371 | s->b.recalibrate = 0; |
| 372 | ide_tf_set_restore_cmd(drive, &args.tf); |
| 373 | } else if (s->b.set_multmode) { |
| 374 | s->b.set_multmode = 0; |
| 375 | ide_tf_set_setmult_cmd(drive, &args.tf); |
| 376 | } else if (s->all) { |
| 377 | int special = s->all; |
| 378 | s->all = 0; |
| 379 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); |
| 380 | return ide_stopped; |
| 381 | } |
| 382 | |
| 383 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
| 384 | IDE_TFLAG_CUSTOM_HANDLER; |
| 385 | |
| 386 | do_rw_taskfile(drive, &args); |
| 387 | |
| 388 | return ide_started; |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * do_special - issue some special commands |
| 393 | * @drive: drive the command is for |
| 394 | * |
| 395 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
| 396 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. |
| 397 | * |
| 398 | * It used to do much more, but has been scaled back. |
| 399 | */ |
| 400 | |
| 401 | static ide_startstop_t do_special (ide_drive_t *drive) |
| 402 | { |
| 403 | special_t *s = &drive->special; |
| 404 | |
| 405 | #ifdef DEBUG |
| 406 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); |
| 407 | #endif |
| 408 | if (drive->media == ide_disk) |
| 409 | return ide_disk_special(drive); |
| 410 | |
| 411 | s->all = 0; |
| 412 | drive->mult_req = 0; |
| 413 | return ide_stopped; |
| 414 | } |
| 415 | |
| 416 | void ide_map_sg(ide_drive_t *drive, struct request *rq) |
| 417 | { |
| 418 | ide_hwif_t *hwif = drive->hwif; |
| 419 | struct scatterlist *sg = hwif->sg_table; |
| 420 | |
| 421 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
| 422 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
| 423 | } else { |
| 424 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
| 425 | hwif->sg_nents = 1; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | EXPORT_SYMBOL_GPL(ide_map_sg); |
| 430 | |
| 431 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) |
| 432 | { |
| 433 | ide_hwif_t *hwif = drive->hwif; |
| 434 | |
| 435 | hwif->nsect = hwif->nleft = rq->nr_sectors; |
| 436 | hwif->cursg_ofs = 0; |
| 437 | hwif->cursg = NULL; |
| 438 | } |
| 439 | |
| 440 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
| 441 | |
| 442 | /** |
| 443 | * execute_drive_command - issue special drive command |
| 444 | * @drive: the drive to issue the command on |
| 445 | * @rq: the request structure holding the command |
| 446 | * |
| 447 | * execute_drive_cmd() issues a special drive command, usually |
| 448 | * initiated by ioctl() from the external hdparm program. The |
| 449 | * command can be a drive command, drive task or taskfile |
| 450 | * operation. Weirdly you can call it with NULL to wait for |
| 451 | * all commands to finish. Don't do this as that is due to change |
| 452 | */ |
| 453 | |
| 454 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, |
| 455 | struct request *rq) |
| 456 | { |
| 457 | ide_hwif_t *hwif = drive->hwif; |
| 458 | ide_task_t *task = rq->special; |
| 459 | |
| 460 | if (task) { |
| 461 | hwif->data_phase = task->data_phase; |
| 462 | |
| 463 | switch (hwif->data_phase) { |
| 464 | case TASKFILE_MULTI_OUT: |
| 465 | case TASKFILE_OUT: |
| 466 | case TASKFILE_MULTI_IN: |
| 467 | case TASKFILE_IN: |
| 468 | ide_init_sg_cmd(drive, rq); |
| 469 | ide_map_sg(drive, rq); |
| 470 | default: |
| 471 | break; |
| 472 | } |
| 473 | |
| 474 | return do_rw_taskfile(drive, task); |
| 475 | } |
| 476 | |
| 477 | /* |
| 478 | * NULL is actually a valid way of waiting for |
| 479 | * all current requests to be flushed from the queue. |
| 480 | */ |
| 481 | #ifdef DEBUG |
| 482 | printk("%s: DRIVE_CMD (null)\n", drive->name); |
| 483 | #endif |
| 484 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
| 485 | ide_read_error(drive)); |
| 486 | |
| 487 | return ide_stopped; |
| 488 | } |
| 489 | |
| 490 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
| 491 | int arg) |
| 492 | { |
| 493 | struct request_queue *q = drive->queue; |
| 494 | struct request *rq; |
| 495 | int ret = 0; |
| 496 | |
| 497 | if (!(setting->flags & DS_SYNC)) |
| 498 | return setting->set(drive, arg); |
| 499 | |
| 500 | rq = blk_get_request(q, READ, __GFP_WAIT); |
| 501 | rq->cmd_type = REQ_TYPE_SPECIAL; |
| 502 | rq->cmd_len = 5; |
| 503 | rq->cmd[0] = REQ_DEVSET_EXEC; |
| 504 | *(int *)&rq->cmd[1] = arg; |
| 505 | rq->special = setting->set; |
| 506 | |
| 507 | if (blk_execute_rq(q, NULL, rq, 0)) |
| 508 | ret = rq->errors; |
| 509 | blk_put_request(rq); |
| 510 | |
| 511 | return ret; |
| 512 | } |
| 513 | EXPORT_SYMBOL_GPL(ide_devset_execute); |
| 514 | |
| 515 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
| 516 | { |
| 517 | u8 cmd = rq->cmd[0]; |
| 518 | |
| 519 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { |
| 520 | ide_task_t task; |
| 521 | struct ide_taskfile *tf = &task.tf; |
| 522 | |
| 523 | memset(&task, 0, sizeof(task)); |
| 524 | if (cmd == REQ_PARK_HEADS) { |
| 525 | drive->sleep = *(unsigned long *)rq->special; |
| 526 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
| 527 | tf->command = ATA_CMD_IDLEIMMEDIATE; |
| 528 | tf->feature = 0x44; |
| 529 | tf->lbal = 0x4c; |
| 530 | tf->lbam = 0x4e; |
| 531 | tf->lbah = 0x55; |
| 532 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; |
| 533 | } else /* cmd == REQ_UNPARK_HEADS */ |
| 534 | tf->command = ATA_CMD_CHK_POWER; |
| 535 | |
| 536 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
| 537 | task.rq = rq; |
| 538 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; |
| 539 | return do_rw_taskfile(drive, &task); |
| 540 | } |
| 541 | |
| 542 | switch (cmd) { |
| 543 | case REQ_DEVSET_EXEC: |
| 544 | { |
| 545 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; |
| 546 | |
| 547 | err = setfunc(drive, *(int *)&rq->cmd[1]); |
| 548 | if (err) |
| 549 | rq->errors = err; |
| 550 | else |
| 551 | err = 1; |
| 552 | ide_end_request(drive, err, 0); |
| 553 | return ide_stopped; |
| 554 | } |
| 555 | case REQ_DRIVE_RESET: |
| 556 | return ide_do_reset(drive); |
| 557 | default: |
| 558 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); |
| 559 | ide_end_request(drive, 0, 0); |
| 560 | return ide_stopped; |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * start_request - start of I/O and command issuing for IDE |
| 566 | * |
| 567 | * start_request() initiates handling of a new I/O request. It |
| 568 | * accepts commands and I/O (read/write) requests. |
| 569 | * |
| 570 | * FIXME: this function needs a rename |
| 571 | */ |
| 572 | |
| 573 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) |
| 574 | { |
| 575 | ide_startstop_t startstop; |
| 576 | |
| 577 | BUG_ON(!blk_rq_started(rq)); |
| 578 | |
| 579 | #ifdef DEBUG |
| 580 | printk("%s: start_request: current=0x%08lx\n", |
| 581 | drive->hwif->name, (unsigned long) rq); |
| 582 | #endif |
| 583 | |
| 584 | /* bail early if we've exceeded max_failures */ |
| 585 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
| 586 | rq->cmd_flags |= REQ_FAILED; |
| 587 | goto kill_rq; |
| 588 | } |
| 589 | |
| 590 | if (blk_pm_request(rq)) |
| 591 | ide_check_pm_state(drive, rq); |
| 592 | |
| 593 | SELECT_DRIVE(drive); |
| 594 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
| 595 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { |
| 596 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
| 597 | return startstop; |
| 598 | } |
| 599 | if (!drive->special.all) { |
| 600 | struct ide_driver *drv; |
| 601 | |
| 602 | /* |
| 603 | * We reset the drive so we need to issue a SETFEATURES. |
| 604 | * Do it _after_ do_special() restored device parameters. |
| 605 | */ |
| 606 | if (drive->current_speed == 0xff) |
| 607 | ide_config_drive_speed(drive, drive->desired_speed); |
| 608 | |
| 609 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
| 610 | return execute_drive_cmd(drive, rq); |
| 611 | else if (blk_pm_request(rq)) { |
| 612 | struct request_pm_state *pm = rq->data; |
| 613 | #ifdef DEBUG_PM |
| 614 | printk("%s: start_power_step(step: %d)\n", |
| 615 | drive->name, pm->pm_step); |
| 616 | #endif |
| 617 | startstop = ide_start_power_step(drive, rq); |
| 618 | if (startstop == ide_stopped && |
| 619 | pm->pm_step == IDE_PM_COMPLETED) |
| 620 | ide_complete_pm_request(drive, rq); |
| 621 | return startstop; |
| 622 | } else if (!rq->rq_disk && blk_special_request(rq)) |
| 623 | /* |
| 624 | * TODO: Once all ULDs have been modified to |
| 625 | * check for specific op codes rather than |
| 626 | * blindly accepting any special request, the |
| 627 | * check for ->rq_disk above may be replaced |
| 628 | * by a more suitable mechanism or even |
| 629 | * dropped entirely. |
| 630 | */ |
| 631 | return ide_special_rq(drive, rq); |
| 632 | |
| 633 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
| 634 | |
| 635 | return drv->do_request(drive, rq, rq->sector); |
| 636 | } |
| 637 | return do_special(drive); |
| 638 | kill_rq: |
| 639 | ide_kill_rq(drive, rq); |
| 640 | return ide_stopped; |
| 641 | } |
| 642 | |
| 643 | /** |
| 644 | * ide_stall_queue - pause an IDE device |
| 645 | * @drive: drive to stall |
| 646 | * @timeout: time to stall for (jiffies) |
| 647 | * |
| 648 | * ide_stall_queue() can be used by a drive to give excess bandwidth back |
| 649 | * to the port by sleeping for timeout jiffies. |
| 650 | */ |
| 651 | |
| 652 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) |
| 653 | { |
| 654 | if (timeout > WAIT_WORSTCASE) |
| 655 | timeout = WAIT_WORSTCASE; |
| 656 | drive->sleep = timeout + jiffies; |
| 657 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
| 658 | } |
| 659 | EXPORT_SYMBOL(ide_stall_queue); |
| 660 | |
| 661 | static inline int ide_lock_port(ide_hwif_t *hwif) |
| 662 | { |
| 663 | if (hwif->busy) |
| 664 | return 1; |
| 665 | |
| 666 | hwif->busy = 1; |
| 667 | |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | static inline void ide_unlock_port(ide_hwif_t *hwif) |
| 672 | { |
| 673 | hwif->busy = 0; |
| 674 | } |
| 675 | |
| 676 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) |
| 677 | { |
| 678 | int rc = 0; |
| 679 | |
| 680 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 681 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); |
| 682 | if (rc == 0) { |
| 683 | /* for atari only */ |
| 684 | ide_get_lock(ide_intr, hwif); |
| 685 | } |
| 686 | } |
| 687 | return rc; |
| 688 | } |
| 689 | |
| 690 | static inline void ide_unlock_host(struct ide_host *host) |
| 691 | { |
| 692 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 693 | /* for atari only */ |
| 694 | ide_release_lock(); |
| 695 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | /* |
| 700 | * Issue a new request to a device. |
| 701 | */ |
| 702 | void do_ide_request(struct request_queue *q) |
| 703 | { |
| 704 | ide_drive_t *drive = q->queuedata; |
| 705 | ide_hwif_t *hwif = drive->hwif; |
| 706 | struct ide_host *host = hwif->host; |
| 707 | struct request *rq = NULL; |
| 708 | ide_startstop_t startstop; |
| 709 | |
| 710 | /* |
| 711 | * drive is doing pre-flush, ordered write, post-flush sequence. even |
| 712 | * though that is 3 requests, it must be seen as a single transaction. |
| 713 | * we must not preempt this drive until that is complete |
| 714 | */ |
| 715 | if (blk_queue_flushing(q)) |
| 716 | /* |
| 717 | * small race where queue could get replugged during |
| 718 | * the 3-request flush cycle, just yank the plug since |
| 719 | * we want it to finish asap |
| 720 | */ |
| 721 | blk_remove_plug(q); |
| 722 | |
| 723 | spin_unlock_irq(q->queue_lock); |
| 724 | |
| 725 | if (ide_lock_host(host, hwif)) |
| 726 | goto plug_device_2; |
| 727 | |
| 728 | spin_lock_irq(&hwif->lock); |
| 729 | |
| 730 | if (!ide_lock_port(hwif)) { |
| 731 | ide_hwif_t *prev_port; |
| 732 | repeat: |
| 733 | prev_port = hwif->host->cur_port; |
| 734 | hwif->rq = NULL; |
| 735 | |
| 736 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
| 737 | if (time_before(drive->sleep, jiffies)) { |
| 738 | ide_unlock_port(hwif); |
| 739 | goto plug_device; |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
| 744 | hwif != prev_port) { |
| 745 | /* |
| 746 | * set nIEN for previous port, drives in the |
| 747 | * quirk_list may not like intr setups/cleanups |
| 748 | */ |
| 749 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
| 750 | prev_port->tp_ops->set_irq(prev_port, 0); |
| 751 | |
| 752 | hwif->host->cur_port = hwif; |
| 753 | } |
| 754 | hwif->cur_dev = drive; |
| 755 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
| 756 | |
| 757 | spin_unlock_irq(&hwif->lock); |
| 758 | spin_lock_irq(q->queue_lock); |
| 759 | /* |
| 760 | * we know that the queue isn't empty, but this can happen |
| 761 | * if the q->prep_rq_fn() decides to kill a request |
| 762 | */ |
| 763 | rq = elv_next_request(drive->queue); |
| 764 | spin_unlock_irq(q->queue_lock); |
| 765 | spin_lock_irq(&hwif->lock); |
| 766 | |
| 767 | if (!rq) { |
| 768 | ide_unlock_port(hwif); |
| 769 | goto out; |
| 770 | } |
| 771 | |
| 772 | /* |
| 773 | * Sanity: don't accept a request that isn't a PM request |
| 774 | * if we are currently power managed. This is very important as |
| 775 | * blk_stop_queue() doesn't prevent the elv_next_request() |
| 776 | * above to return us whatever is in the queue. Since we call |
| 777 | * ide_do_request() ourselves, we end up taking requests while |
| 778 | * the queue is blocked... |
| 779 | * |
| 780 | * We let requests forced at head of queue with ide-preempt |
| 781 | * though. I hope that doesn't happen too much, hopefully not |
| 782 | * unless the subdriver triggers such a thing in its own PM |
| 783 | * state machine. |
| 784 | */ |
| 785 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
| 786 | blk_pm_request(rq) == 0 && |
| 787 | (rq->cmd_flags & REQ_PREEMPT) == 0) { |
| 788 | /* there should be no pending command at this point */ |
| 789 | ide_unlock_port(hwif); |
| 790 | goto plug_device; |
| 791 | } |
| 792 | |
| 793 | hwif->rq = rq; |
| 794 | |
| 795 | spin_unlock_irq(&hwif->lock); |
| 796 | startstop = start_request(drive, rq); |
| 797 | spin_lock_irq(&hwif->lock); |
| 798 | |
| 799 | if (startstop == ide_stopped) |
| 800 | goto repeat; |
| 801 | } else |
| 802 | goto plug_device; |
| 803 | out: |
| 804 | spin_unlock_irq(&hwif->lock); |
| 805 | if (rq == NULL) |
| 806 | ide_unlock_host(host); |
| 807 | spin_lock_irq(q->queue_lock); |
| 808 | return; |
| 809 | |
| 810 | plug_device: |
| 811 | spin_unlock_irq(&hwif->lock); |
| 812 | ide_unlock_host(host); |
| 813 | plug_device_2: |
| 814 | spin_lock_irq(q->queue_lock); |
| 815 | |
| 816 | if (!elv_queue_empty(q)) |
| 817 | blk_plug_device(q); |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * un-busy the port etc, and clear any pending DMA status. we want to |
| 822 | * retry the current request in pio mode instead of risking tossing it |
| 823 | * all away |
| 824 | */ |
| 825 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) |
| 826 | { |
| 827 | ide_hwif_t *hwif = drive->hwif; |
| 828 | struct request *rq; |
| 829 | ide_startstop_t ret = ide_stopped; |
| 830 | |
| 831 | /* |
| 832 | * end current dma transaction |
| 833 | */ |
| 834 | |
| 835 | if (error < 0) { |
| 836 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); |
| 837 | (void)hwif->dma_ops->dma_end(drive); |
| 838 | ret = ide_error(drive, "dma timeout error", |
| 839 | hwif->tp_ops->read_status(hwif)); |
| 840 | } else { |
| 841 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); |
| 842 | hwif->dma_ops->dma_timeout(drive); |
| 843 | } |
| 844 | |
| 845 | /* |
| 846 | * disable dma for now, but remember that we did so because of |
| 847 | * a timeout -- we'll reenable after we finish this next request |
| 848 | * (or rather the first chunk of it) in pio. |
| 849 | */ |
| 850 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
| 851 | drive->retry_pio++; |
| 852 | ide_dma_off_quietly(drive); |
| 853 | |
| 854 | /* |
| 855 | * un-busy drive etc and make sure request is sane |
| 856 | */ |
| 857 | |
| 858 | rq = hwif->rq; |
| 859 | if (!rq) |
| 860 | goto out; |
| 861 | |
| 862 | hwif->rq = NULL; |
| 863 | |
| 864 | rq->errors = 0; |
| 865 | |
| 866 | if (!rq->bio) |
| 867 | goto out; |
| 868 | |
| 869 | rq->sector = rq->bio->bi_sector; |
| 870 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; |
| 871 | rq->hard_cur_sectors = rq->current_nr_sectors; |
| 872 | rq->buffer = bio_data(rq->bio); |
| 873 | out: |
| 874 | return ret; |
| 875 | } |
| 876 | |
| 877 | static void ide_plug_device(ide_drive_t *drive) |
| 878 | { |
| 879 | struct request_queue *q = drive->queue; |
| 880 | unsigned long flags; |
| 881 | |
| 882 | spin_lock_irqsave(q->queue_lock, flags); |
| 883 | if (!elv_queue_empty(q)) |
| 884 | blk_plug_device(q); |
| 885 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 886 | } |
| 887 | |
| 888 | /** |
| 889 | * ide_timer_expiry - handle lack of an IDE interrupt |
| 890 | * @data: timer callback magic (hwif) |
| 891 | * |
| 892 | * An IDE command has timed out before the expected drive return |
| 893 | * occurred. At this point we attempt to clean up the current |
| 894 | * mess. If the current handler includes an expiry handler then |
| 895 | * we invoke the expiry handler, and providing it is happy the |
| 896 | * work is done. If that fails we apply generic recovery rules |
| 897 | * invoking the handler and checking the drive DMA status. We |
| 898 | * have an excessively incestuous relationship with the DMA |
| 899 | * logic that wants cleaning up. |
| 900 | */ |
| 901 | |
| 902 | void ide_timer_expiry (unsigned long data) |
| 903 | { |
| 904 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
| 905 | ide_drive_t *uninitialized_var(drive); |
| 906 | ide_handler_t *handler; |
| 907 | unsigned long flags; |
| 908 | unsigned long wait = -1; |
| 909 | int plug_device = 0; |
| 910 | |
| 911 | spin_lock_irqsave(&hwif->lock, flags); |
| 912 | |
| 913 | handler = hwif->handler; |
| 914 | |
| 915 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
| 916 | /* |
| 917 | * Either a marginal timeout occurred |
| 918 | * (got the interrupt just as timer expired), |
| 919 | * or we were "sleeping" to give other devices a chance. |
| 920 | * Either way, we don't really want to complain about anything. |
| 921 | */ |
| 922 | } else { |
| 923 | drive = hwif->cur_dev; |
| 924 | if (!drive) { |
| 925 | printk(KERN_ERR "%s: ->cur_dev was NULL\n", __func__); |
| 926 | hwif->handler = NULL; |
| 927 | } else { |
| 928 | ide_expiry_t *expiry = hwif->expiry; |
| 929 | ide_startstop_t startstop = ide_stopped; |
| 930 | |
| 931 | if (expiry) { |
| 932 | /* continue */ |
| 933 | if ((wait = expiry(drive)) > 0) { |
| 934 | /* reset timer */ |
| 935 | hwif->timer.expires = jiffies + wait; |
| 936 | hwif->req_gen_timer = hwif->req_gen; |
| 937 | add_timer(&hwif->timer); |
| 938 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 939 | return; |
| 940 | } |
| 941 | } |
| 942 | hwif->handler = NULL; |
| 943 | /* |
| 944 | * We need to simulate a real interrupt when invoking |
| 945 | * the handler() function, which means we need to |
| 946 | * globally mask the specific IRQ: |
| 947 | */ |
| 948 | spin_unlock(&hwif->lock); |
| 949 | /* disable_irq_nosync ?? */ |
| 950 | disable_irq(hwif->irq); |
| 951 | /* local CPU only, |
| 952 | * as if we were handling an interrupt */ |
| 953 | local_irq_disable(); |
| 954 | if (hwif->polling) { |
| 955 | startstop = handler(drive); |
| 956 | } else if (drive_is_ready(drive)) { |
| 957 | if (drive->waiting_for_dma) |
| 958 | hwif->dma_ops->dma_lost_irq(drive); |
| 959 | (void)ide_ack_intr(hwif); |
| 960 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); |
| 961 | startstop = handler(drive); |
| 962 | } else { |
| 963 | if (drive->waiting_for_dma) { |
| 964 | startstop = ide_dma_timeout_retry(drive, wait); |
| 965 | } else |
| 966 | startstop = |
| 967 | ide_error(drive, "irq timeout", |
| 968 | hwif->tp_ops->read_status(hwif)); |
| 969 | } |
| 970 | spin_lock_irq(&hwif->lock); |
| 971 | enable_irq(hwif->irq); |
| 972 | if (startstop == ide_stopped) { |
| 973 | ide_unlock_port(hwif); |
| 974 | plug_device = 1; |
| 975 | } |
| 976 | } |
| 977 | } |
| 978 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 979 | |
| 980 | if (plug_device) { |
| 981 | ide_unlock_host(hwif->host); |
| 982 | ide_plug_device(drive); |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | /** |
| 987 | * unexpected_intr - handle an unexpected IDE interrupt |
| 988 | * @irq: interrupt line |
| 989 | * @hwif: port being processed |
| 990 | * |
| 991 | * There's nothing really useful we can do with an unexpected interrupt, |
| 992 | * other than reading the status register (to clear it), and logging it. |
| 993 | * There should be no way that an irq can happen before we're ready for it, |
| 994 | * so we needn't worry much about losing an "important" interrupt here. |
| 995 | * |
| 996 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever |
| 997 | * the drive enters "idle", "standby", or "sleep" mode, so if the status |
| 998 | * looks "good", we just ignore the interrupt completely. |
| 999 | * |
| 1000 | * This routine assumes __cli() is in effect when called. |
| 1001 | * |
| 1002 | * If an unexpected interrupt happens on irq15 while we are handling irq14 |
| 1003 | * and if the two interfaces are "serialized" (CMD640), then it looks like |
| 1004 | * we could screw up by interfering with a new request being set up for |
| 1005 | * irq15. |
| 1006 | * |
| 1007 | * In reality, this is a non-issue. The new command is not sent unless |
| 1008 | * the drive is ready to accept one, in which case we know the drive is |
| 1009 | * not trying to interrupt us. And ide_set_handler() is always invoked |
| 1010 | * before completing the issuance of any new drive command, so we will not |
| 1011 | * be accidentally invoked as a result of any valid command completion |
| 1012 | * interrupt. |
| 1013 | */ |
| 1014 | |
| 1015 | static void unexpected_intr(int irq, ide_hwif_t *hwif) |
| 1016 | { |
| 1017 | u8 stat = hwif->tp_ops->read_status(hwif); |
| 1018 | |
| 1019 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
| 1020 | /* Try to not flood the console with msgs */ |
| 1021 | static unsigned long last_msgtime, count; |
| 1022 | ++count; |
| 1023 | |
| 1024 | if (time_after(jiffies, last_msgtime + HZ)) { |
| 1025 | last_msgtime = jiffies; |
| 1026 | printk(KERN_ERR "%s: unexpected interrupt, " |
| 1027 | "status=0x%02x, count=%ld\n", |
| 1028 | hwif->name, stat, count); |
| 1029 | } |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | /** |
| 1034 | * ide_intr - default IDE interrupt handler |
| 1035 | * @irq: interrupt number |
| 1036 | * @dev_id: hwif |
| 1037 | * @regs: unused weirdness from the kernel irq layer |
| 1038 | * |
| 1039 | * This is the default IRQ handler for the IDE layer. You should |
| 1040 | * not need to override it. If you do be aware it is subtle in |
| 1041 | * places |
| 1042 | * |
| 1043 | * hwif is the interface in the group currently performing |
| 1044 | * a command. hwif->cur_dev is the drive and hwif->handler is |
| 1045 | * the IRQ handler to call. As we issue a command the handlers |
| 1046 | * step through multiple states, reassigning the handler to the |
| 1047 | * next step in the process. Unlike a smart SCSI controller IDE |
| 1048 | * expects the main processor to sequence the various transfer |
| 1049 | * stages. We also manage a poll timer to catch up with most |
| 1050 | * timeout situations. There are still a few where the handlers |
| 1051 | * don't ever decide to give up. |
| 1052 | * |
| 1053 | * The handler eventually returns ide_stopped to indicate the |
| 1054 | * request completed. At this point we issue the next request |
| 1055 | * on the port and the process begins again. |
| 1056 | */ |
| 1057 | |
| 1058 | irqreturn_t ide_intr (int irq, void *dev_id) |
| 1059 | { |
| 1060 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
| 1061 | ide_drive_t *uninitialized_var(drive); |
| 1062 | ide_handler_t *handler; |
| 1063 | unsigned long flags; |
| 1064 | ide_startstop_t startstop; |
| 1065 | irqreturn_t irq_ret = IRQ_NONE; |
| 1066 | int plug_device = 0; |
| 1067 | |
| 1068 | if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 1069 | if (hwif != hwif->host->cur_port) |
| 1070 | goto out_early; |
| 1071 | } |
| 1072 | |
| 1073 | spin_lock_irqsave(&hwif->lock, flags); |
| 1074 | |
| 1075 | if (!ide_ack_intr(hwif)) |
| 1076 | goto out; |
| 1077 | |
| 1078 | handler = hwif->handler; |
| 1079 | |
| 1080 | if (handler == NULL || hwif->polling) { |
| 1081 | /* |
| 1082 | * Not expecting an interrupt from this drive. |
| 1083 | * That means this could be: |
| 1084 | * (1) an interrupt from another PCI device |
| 1085 | * sharing the same PCI INT# as us. |
| 1086 | * or (2) a drive just entered sleep or standby mode, |
| 1087 | * and is interrupting to let us know. |
| 1088 | * or (3) a spurious interrupt of unknown origin. |
| 1089 | * |
| 1090 | * For PCI, we cannot tell the difference, |
| 1091 | * so in that case we just ignore it and hope it goes away. |
| 1092 | * |
| 1093 | * FIXME: unexpected_intr should be hwif-> then we can |
| 1094 | * remove all the ifdef PCI crap |
| 1095 | */ |
| 1096 | #ifdef CONFIG_BLK_DEV_IDEPCI |
| 1097 | if (hwif->chipset != ide_pci) |
| 1098 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| 1099 | { |
| 1100 | /* |
| 1101 | * Probably not a shared PCI interrupt, |
| 1102 | * so we can safely try to do something about it: |
| 1103 | */ |
| 1104 | unexpected_intr(irq, hwif); |
| 1105 | #ifdef CONFIG_BLK_DEV_IDEPCI |
| 1106 | } else { |
| 1107 | /* |
| 1108 | * Whack the status register, just in case |
| 1109 | * we have a leftover pending IRQ. |
| 1110 | */ |
| 1111 | (void)hwif->tp_ops->read_status(hwif); |
| 1112 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| 1113 | } |
| 1114 | goto out; |
| 1115 | } |
| 1116 | |
| 1117 | drive = hwif->cur_dev; |
| 1118 | if (!drive) { |
| 1119 | /* |
| 1120 | * This should NEVER happen, and there isn't much |
| 1121 | * we could do about it here. |
| 1122 | * |
| 1123 | * [Note - this can occur if the drive is hot unplugged] |
| 1124 | */ |
| 1125 | goto out_handled; |
| 1126 | } |
| 1127 | |
| 1128 | if (!drive_is_ready(drive)) |
| 1129 | /* |
| 1130 | * This happens regularly when we share a PCI IRQ with |
| 1131 | * another device. Unfortunately, it can also happen |
| 1132 | * with some buggy drives that trigger the IRQ before |
| 1133 | * their status register is up to date. Hopefully we have |
| 1134 | * enough advance overhead that the latter isn't a problem. |
| 1135 | */ |
| 1136 | goto out; |
| 1137 | |
| 1138 | hwif->handler = NULL; |
| 1139 | hwif->req_gen++; |
| 1140 | del_timer(&hwif->timer); |
| 1141 | spin_unlock(&hwif->lock); |
| 1142 | |
| 1143 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
| 1144 | hwif->port_ops->clear_irq(drive); |
| 1145 | |
| 1146 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
| 1147 | local_irq_enable_in_hardirq(); |
| 1148 | |
| 1149 | /* service this interrupt, may set handler for next interrupt */ |
| 1150 | startstop = handler(drive); |
| 1151 | |
| 1152 | spin_lock_irq(&hwif->lock); |
| 1153 | /* |
| 1154 | * Note that handler() may have set things up for another |
| 1155 | * interrupt to occur soon, but it cannot happen until |
| 1156 | * we exit from this routine, because it will be the |
| 1157 | * same irq as is currently being serviced here, and Linux |
| 1158 | * won't allow another of the same (on any CPU) until we return. |
| 1159 | */ |
| 1160 | if (startstop == ide_stopped) { |
| 1161 | BUG_ON(hwif->handler); |
| 1162 | ide_unlock_port(hwif); |
| 1163 | plug_device = 1; |
| 1164 | } |
| 1165 | out_handled: |
| 1166 | irq_ret = IRQ_HANDLED; |
| 1167 | out: |
| 1168 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 1169 | out_early: |
| 1170 | if (plug_device) { |
| 1171 | ide_unlock_host(hwif->host); |
| 1172 | ide_plug_device(drive); |
| 1173 | } |
| 1174 | |
| 1175 | return irq_ret; |
| 1176 | } |
| 1177 | |
| 1178 | /** |
| 1179 | * ide_do_drive_cmd - issue IDE special command |
| 1180 | * @drive: device to issue command |
| 1181 | * @rq: request to issue |
| 1182 | * |
| 1183 | * This function issues a special IDE device request |
| 1184 | * onto the request queue. |
| 1185 | * |
| 1186 | * the rq is queued at the head of the request queue, displacing |
| 1187 | * the currently-being-processed request and this function |
| 1188 | * returns immediately without waiting for the new rq to be |
| 1189 | * completed. This is VERY DANGEROUS, and is intended for |
| 1190 | * careful use by the ATAPI tape/cdrom driver code. |
| 1191 | */ |
| 1192 | |
| 1193 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) |
| 1194 | { |
| 1195 | struct request_queue *q = drive->queue; |
| 1196 | unsigned long flags; |
| 1197 | |
| 1198 | drive->hwif->rq = NULL; |
| 1199 | |
| 1200 | spin_lock_irqsave(q->queue_lock, flags); |
| 1201 | __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0); |
| 1202 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 1203 | } |
| 1204 | EXPORT_SYMBOL(ide_do_drive_cmd); |
| 1205 | |
| 1206 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) |
| 1207 | { |
| 1208 | ide_hwif_t *hwif = drive->hwif; |
| 1209 | ide_task_t task; |
| 1210 | |
| 1211 | memset(&task, 0, sizeof(task)); |
| 1212 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | |
| 1213 | IDE_TFLAG_OUT_FEATURE | tf_flags; |
| 1214 | task.tf.feature = dma; /* Use PIO/DMA */ |
| 1215 | task.tf.lbam = bcount & 0xff; |
| 1216 | task.tf.lbah = (bcount >> 8) & 0xff; |
| 1217 | |
| 1218 | ide_tf_dump(drive->name, &task.tf); |
| 1219 | hwif->tp_ops->set_irq(hwif, 1); |
| 1220 | SELECT_MASK(drive, 0); |
| 1221 | hwif->tp_ops->tf_load(drive, &task); |
| 1222 | } |
| 1223 | |
| 1224 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); |
| 1225 | |
| 1226 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
| 1227 | { |
| 1228 | ide_hwif_t *hwif = drive->hwif; |
| 1229 | u8 buf[4] = { 0 }; |
| 1230 | |
| 1231 | while (len > 0) { |
| 1232 | if (write) |
| 1233 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
| 1234 | else |
| 1235 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
| 1236 | len -= 4; |
| 1237 | } |
| 1238 | } |
| 1239 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |