| 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->hwgroup->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->hwgroup->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_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
| 164 | struct request *rq = hwgroup->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 | hwgroup->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 | ide_driver_t *drv; |
| 203 | |
| 204 | drv = *(ide_driver_t **)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 | 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 | EXPORT_SYMBOL_GPL(__ide_error); |
| 303 | |
| 304 | /** |
| 305 | * ide_error - handle an error on the IDE |
| 306 | * @drive: drive the error occurred on |
| 307 | * @msg: message to report |
| 308 | * @stat: status bits |
| 309 | * |
| 310 | * ide_error() takes action based on the error returned by the drive. |
| 311 | * For normal I/O that may well include retries. We deal with |
| 312 | * both new-style (taskfile) and old style command handling here. |
| 313 | * In the case of taskfile command handling there is work left to |
| 314 | * do |
| 315 | */ |
| 316 | |
| 317 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) |
| 318 | { |
| 319 | struct request *rq; |
| 320 | u8 err; |
| 321 | |
| 322 | err = ide_dump_status(drive, msg, stat); |
| 323 | |
| 324 | if ((rq = HWGROUP(drive)->rq) == NULL) |
| 325 | return ide_stopped; |
| 326 | |
| 327 | /* retry only "normal" I/O: */ |
| 328 | if (!blk_fs_request(rq)) { |
| 329 | rq->errors = 1; |
| 330 | ide_end_drive_cmd(drive, stat, err); |
| 331 | return ide_stopped; |
| 332 | } |
| 333 | |
| 334 | if (rq->rq_disk) { |
| 335 | ide_driver_t *drv; |
| 336 | |
| 337 | drv = *(ide_driver_t **)rq->rq_disk->private_data; |
| 338 | return drv->error(drive, rq, stat, err); |
| 339 | } else |
| 340 | return __ide_error(drive, rq, stat, err); |
| 341 | } |
| 342 | |
| 343 | EXPORT_SYMBOL_GPL(ide_error); |
| 344 | |
| 345 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
| 346 | { |
| 347 | tf->nsect = drive->sect; |
| 348 | tf->lbal = drive->sect; |
| 349 | tf->lbam = drive->cyl; |
| 350 | tf->lbah = drive->cyl >> 8; |
| 351 | tf->device = (drive->head - 1) | drive->select; |
| 352 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
| 353 | } |
| 354 | |
| 355 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
| 356 | { |
| 357 | tf->nsect = drive->sect; |
| 358 | tf->command = ATA_CMD_RESTORE; |
| 359 | } |
| 360 | |
| 361 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
| 362 | { |
| 363 | tf->nsect = drive->mult_req; |
| 364 | tf->command = ATA_CMD_SET_MULTI; |
| 365 | } |
| 366 | |
| 367 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) |
| 368 | { |
| 369 | special_t *s = &drive->special; |
| 370 | ide_task_t args; |
| 371 | |
| 372 | memset(&args, 0, sizeof(ide_task_t)); |
| 373 | args.data_phase = TASKFILE_NO_DATA; |
| 374 | |
| 375 | if (s->b.set_geometry) { |
| 376 | s->b.set_geometry = 0; |
| 377 | ide_tf_set_specify_cmd(drive, &args.tf); |
| 378 | } else if (s->b.recalibrate) { |
| 379 | s->b.recalibrate = 0; |
| 380 | ide_tf_set_restore_cmd(drive, &args.tf); |
| 381 | } else if (s->b.set_multmode) { |
| 382 | s->b.set_multmode = 0; |
| 383 | ide_tf_set_setmult_cmd(drive, &args.tf); |
| 384 | } else if (s->all) { |
| 385 | int special = s->all; |
| 386 | s->all = 0; |
| 387 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); |
| 388 | return ide_stopped; |
| 389 | } |
| 390 | |
| 391 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
| 392 | IDE_TFLAG_CUSTOM_HANDLER; |
| 393 | |
| 394 | do_rw_taskfile(drive, &args); |
| 395 | |
| 396 | return ide_started; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * do_special - issue some special commands |
| 401 | * @drive: drive the command is for |
| 402 | * |
| 403 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
| 404 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. |
| 405 | * |
| 406 | * It used to do much more, but has been scaled back. |
| 407 | */ |
| 408 | |
| 409 | static ide_startstop_t do_special (ide_drive_t *drive) |
| 410 | { |
| 411 | special_t *s = &drive->special; |
| 412 | |
| 413 | #ifdef DEBUG |
| 414 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); |
| 415 | #endif |
| 416 | if (drive->media == ide_disk) |
| 417 | return ide_disk_special(drive); |
| 418 | |
| 419 | s->all = 0; |
| 420 | drive->mult_req = 0; |
| 421 | return ide_stopped; |
| 422 | } |
| 423 | |
| 424 | void ide_map_sg(ide_drive_t *drive, struct request *rq) |
| 425 | { |
| 426 | ide_hwif_t *hwif = drive->hwif; |
| 427 | struct scatterlist *sg = hwif->sg_table; |
| 428 | |
| 429 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
| 430 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
| 431 | } else { |
| 432 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
| 433 | hwif->sg_nents = 1; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | EXPORT_SYMBOL_GPL(ide_map_sg); |
| 438 | |
| 439 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) |
| 440 | { |
| 441 | ide_hwif_t *hwif = drive->hwif; |
| 442 | |
| 443 | hwif->nsect = hwif->nleft = rq->nr_sectors; |
| 444 | hwif->cursg_ofs = 0; |
| 445 | hwif->cursg = NULL; |
| 446 | } |
| 447 | |
| 448 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
| 449 | |
| 450 | /** |
| 451 | * execute_drive_command - issue special drive command |
| 452 | * @drive: the drive to issue the command on |
| 453 | * @rq: the request structure holding the command |
| 454 | * |
| 455 | * execute_drive_cmd() issues a special drive command, usually |
| 456 | * initiated by ioctl() from the external hdparm program. The |
| 457 | * command can be a drive command, drive task or taskfile |
| 458 | * operation. Weirdly you can call it with NULL to wait for |
| 459 | * all commands to finish. Don't do this as that is due to change |
| 460 | */ |
| 461 | |
| 462 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, |
| 463 | struct request *rq) |
| 464 | { |
| 465 | ide_hwif_t *hwif = HWIF(drive); |
| 466 | ide_task_t *task = rq->special; |
| 467 | |
| 468 | if (task) { |
| 469 | hwif->data_phase = task->data_phase; |
| 470 | |
| 471 | switch (hwif->data_phase) { |
| 472 | case TASKFILE_MULTI_OUT: |
| 473 | case TASKFILE_OUT: |
| 474 | case TASKFILE_MULTI_IN: |
| 475 | case TASKFILE_IN: |
| 476 | ide_init_sg_cmd(drive, rq); |
| 477 | ide_map_sg(drive, rq); |
| 478 | default: |
| 479 | break; |
| 480 | } |
| 481 | |
| 482 | return do_rw_taskfile(drive, task); |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * NULL is actually a valid way of waiting for |
| 487 | * all current requests to be flushed from the queue. |
| 488 | */ |
| 489 | #ifdef DEBUG |
| 490 | printk("%s: DRIVE_CMD (null)\n", drive->name); |
| 491 | #endif |
| 492 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
| 493 | ide_read_error(drive)); |
| 494 | |
| 495 | return ide_stopped; |
| 496 | } |
| 497 | |
| 498 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
| 499 | int arg) |
| 500 | { |
| 501 | struct request_queue *q = drive->queue; |
| 502 | struct request *rq; |
| 503 | int ret = 0; |
| 504 | |
| 505 | if (!(setting->flags & DS_SYNC)) |
| 506 | return setting->set(drive, arg); |
| 507 | |
| 508 | rq = blk_get_request(q, READ, __GFP_WAIT); |
| 509 | rq->cmd_type = REQ_TYPE_SPECIAL; |
| 510 | rq->cmd_len = 5; |
| 511 | rq->cmd[0] = REQ_DEVSET_EXEC; |
| 512 | *(int *)&rq->cmd[1] = arg; |
| 513 | rq->special = setting->set; |
| 514 | |
| 515 | if (blk_execute_rq(q, NULL, rq, 0)) |
| 516 | ret = rq->errors; |
| 517 | blk_put_request(rq); |
| 518 | |
| 519 | return ret; |
| 520 | } |
| 521 | EXPORT_SYMBOL_GPL(ide_devset_execute); |
| 522 | |
| 523 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
| 524 | { |
| 525 | u8 cmd = rq->cmd[0]; |
| 526 | |
| 527 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { |
| 528 | ide_task_t task; |
| 529 | struct ide_taskfile *tf = &task.tf; |
| 530 | |
| 531 | memset(&task, 0, sizeof(task)); |
| 532 | if (cmd == REQ_PARK_HEADS) { |
| 533 | drive->sleep = *(unsigned long *)rq->special; |
| 534 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
| 535 | tf->command = ATA_CMD_IDLEIMMEDIATE; |
| 536 | tf->feature = 0x44; |
| 537 | tf->lbal = 0x4c; |
| 538 | tf->lbam = 0x4e; |
| 539 | tf->lbah = 0x55; |
| 540 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; |
| 541 | } else /* cmd == REQ_UNPARK_HEADS */ |
| 542 | tf->command = ATA_CMD_CHK_POWER; |
| 543 | |
| 544 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
| 545 | task.rq = rq; |
| 546 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; |
| 547 | return do_rw_taskfile(drive, &task); |
| 548 | } |
| 549 | |
| 550 | switch (cmd) { |
| 551 | case REQ_DEVSET_EXEC: |
| 552 | { |
| 553 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; |
| 554 | |
| 555 | err = setfunc(drive, *(int *)&rq->cmd[1]); |
| 556 | if (err) |
| 557 | rq->errors = err; |
| 558 | else |
| 559 | err = 1; |
| 560 | ide_end_request(drive, err, 0); |
| 561 | return ide_stopped; |
| 562 | } |
| 563 | case REQ_DRIVE_RESET: |
| 564 | return ide_do_reset(drive); |
| 565 | default: |
| 566 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); |
| 567 | ide_end_request(drive, 0, 0); |
| 568 | return ide_stopped; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | /** |
| 573 | * start_request - start of I/O and command issuing for IDE |
| 574 | * |
| 575 | * start_request() initiates handling of a new I/O request. It |
| 576 | * accepts commands and I/O (read/write) requests. |
| 577 | * |
| 578 | * FIXME: this function needs a rename |
| 579 | */ |
| 580 | |
| 581 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) |
| 582 | { |
| 583 | ide_startstop_t startstop; |
| 584 | |
| 585 | BUG_ON(!blk_rq_started(rq)); |
| 586 | |
| 587 | #ifdef DEBUG |
| 588 | printk("%s: start_request: current=0x%08lx\n", |
| 589 | HWIF(drive)->name, (unsigned long) rq); |
| 590 | #endif |
| 591 | |
| 592 | /* bail early if we've exceeded max_failures */ |
| 593 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
| 594 | rq->cmd_flags |= REQ_FAILED; |
| 595 | goto kill_rq; |
| 596 | } |
| 597 | |
| 598 | if (blk_pm_request(rq)) |
| 599 | ide_check_pm_state(drive, rq); |
| 600 | |
| 601 | SELECT_DRIVE(drive); |
| 602 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
| 603 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { |
| 604 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
| 605 | return startstop; |
| 606 | } |
| 607 | if (!drive->special.all) { |
| 608 | ide_driver_t *drv; |
| 609 | |
| 610 | /* |
| 611 | * We reset the drive so we need to issue a SETFEATURES. |
| 612 | * Do it _after_ do_special() restored device parameters. |
| 613 | */ |
| 614 | if (drive->current_speed == 0xff) |
| 615 | ide_config_drive_speed(drive, drive->desired_speed); |
| 616 | |
| 617 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
| 618 | return execute_drive_cmd(drive, rq); |
| 619 | else if (blk_pm_request(rq)) { |
| 620 | struct request_pm_state *pm = rq->data; |
| 621 | #ifdef DEBUG_PM |
| 622 | printk("%s: start_power_step(step: %d)\n", |
| 623 | drive->name, pm->pm_step); |
| 624 | #endif |
| 625 | startstop = ide_start_power_step(drive, rq); |
| 626 | if (startstop == ide_stopped && |
| 627 | pm->pm_step == IDE_PM_COMPLETED) |
| 628 | ide_complete_pm_request(drive, rq); |
| 629 | return startstop; |
| 630 | } else if (!rq->rq_disk && blk_special_request(rq)) |
| 631 | /* |
| 632 | * TODO: Once all ULDs have been modified to |
| 633 | * check for specific op codes rather than |
| 634 | * blindly accepting any special request, the |
| 635 | * check for ->rq_disk above may be replaced |
| 636 | * by a more suitable mechanism or even |
| 637 | * dropped entirely. |
| 638 | */ |
| 639 | return ide_special_rq(drive, rq); |
| 640 | |
| 641 | drv = *(ide_driver_t **)rq->rq_disk->private_data; |
| 642 | |
| 643 | return drv->do_request(drive, rq, rq->sector); |
| 644 | } |
| 645 | return do_special(drive); |
| 646 | kill_rq: |
| 647 | ide_kill_rq(drive, rq); |
| 648 | return ide_stopped; |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * ide_stall_queue - pause an IDE device |
| 653 | * @drive: drive to stall |
| 654 | * @timeout: time to stall for (jiffies) |
| 655 | * |
| 656 | * ide_stall_queue() can be used by a drive to give excess bandwidth back |
| 657 | * to the hwgroup by sleeping for timeout jiffies. |
| 658 | */ |
| 659 | |
| 660 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) |
| 661 | { |
| 662 | if (timeout > WAIT_WORSTCASE) |
| 663 | timeout = WAIT_WORSTCASE; |
| 664 | drive->sleep = timeout + jiffies; |
| 665 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
| 666 | } |
| 667 | EXPORT_SYMBOL(ide_stall_queue); |
| 668 | |
| 669 | static inline int ide_lock_port(ide_hwif_t *hwif) |
| 670 | { |
| 671 | if (hwif->busy) |
| 672 | return 1; |
| 673 | |
| 674 | hwif->busy = 1; |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | static inline void ide_unlock_port(ide_hwif_t *hwif) |
| 680 | { |
| 681 | hwif->busy = 0; |
| 682 | } |
| 683 | |
| 684 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) |
| 685 | { |
| 686 | int rc = 0; |
| 687 | |
| 688 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 689 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); |
| 690 | if (rc == 0) { |
| 691 | /* for atari only */ |
| 692 | ide_get_lock(ide_intr, hwif); |
| 693 | } |
| 694 | } |
| 695 | return rc; |
| 696 | } |
| 697 | |
| 698 | static inline void ide_unlock_host(struct ide_host *host) |
| 699 | { |
| 700 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 701 | /* for atari only */ |
| 702 | ide_release_lock(); |
| 703 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
| 704 | } |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * Issue a new request to a drive from hwgroup |
| 709 | */ |
| 710 | void do_ide_request(struct request_queue *q) |
| 711 | { |
| 712 | ide_drive_t *drive = q->queuedata; |
| 713 | ide_hwif_t *hwif = drive->hwif; |
| 714 | struct ide_host *host = hwif->host; |
| 715 | ide_hwgroup_t *hwgroup = hwif->hwgroup; |
| 716 | struct request *rq = NULL; |
| 717 | ide_startstop_t startstop; |
| 718 | |
| 719 | /* |
| 720 | * drive is doing pre-flush, ordered write, post-flush sequence. even |
| 721 | * though that is 3 requests, it must be seen as a single transaction. |
| 722 | * we must not preempt this drive until that is complete |
| 723 | */ |
| 724 | if (blk_queue_flushing(q)) |
| 725 | /* |
| 726 | * small race where queue could get replugged during |
| 727 | * the 3-request flush cycle, just yank the plug since |
| 728 | * we want it to finish asap |
| 729 | */ |
| 730 | blk_remove_plug(q); |
| 731 | |
| 732 | spin_unlock_irq(q->queue_lock); |
| 733 | |
| 734 | if (ide_lock_host(host, hwif)) |
| 735 | goto plug_device_2; |
| 736 | |
| 737 | spin_lock_irq(&hwgroup->lock); |
| 738 | |
| 739 | if (!ide_lock_port(hwif)) { |
| 740 | ide_hwif_t *prev_port; |
| 741 | repeat: |
| 742 | prev_port = hwif->host->cur_port; |
| 743 | hwgroup->rq = NULL; |
| 744 | |
| 745 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
| 746 | if (time_before(drive->sleep, jiffies)) { |
| 747 | ide_unlock_port(hwif); |
| 748 | goto plug_device; |
| 749 | } |
| 750 | } |
| 751 | |
| 752 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
| 753 | hwif != prev_port) { |
| 754 | /* |
| 755 | * set nIEN for previous port, drives in the |
| 756 | * quirk_list may not like intr setups/cleanups |
| 757 | */ |
| 758 | if (prev_port && hwgroup->cur_dev->quirk_list == 0) |
| 759 | prev_port->tp_ops->set_irq(prev_port, 0); |
| 760 | |
| 761 | hwif->host->cur_port = hwif; |
| 762 | } |
| 763 | hwgroup->cur_dev = drive; |
| 764 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
| 765 | |
| 766 | spin_unlock_irq(&hwgroup->lock); |
| 767 | spin_lock_irq(q->queue_lock); |
| 768 | /* |
| 769 | * we know that the queue isn't empty, but this can happen |
| 770 | * if the q->prep_rq_fn() decides to kill a request |
| 771 | */ |
| 772 | rq = elv_next_request(drive->queue); |
| 773 | spin_unlock_irq(q->queue_lock); |
| 774 | spin_lock_irq(&hwgroup->lock); |
| 775 | |
| 776 | if (!rq) { |
| 777 | ide_unlock_port(hwif); |
| 778 | goto out; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Sanity: don't accept a request that isn't a PM request |
| 783 | * if we are currently power managed. This is very important as |
| 784 | * blk_stop_queue() doesn't prevent the elv_next_request() |
| 785 | * above to return us whatever is in the queue. Since we call |
| 786 | * ide_do_request() ourselves, we end up taking requests while |
| 787 | * the queue is blocked... |
| 788 | * |
| 789 | * We let requests forced at head of queue with ide-preempt |
| 790 | * though. I hope that doesn't happen too much, hopefully not |
| 791 | * unless the subdriver triggers such a thing in its own PM |
| 792 | * state machine. |
| 793 | */ |
| 794 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
| 795 | blk_pm_request(rq) == 0 && |
| 796 | (rq->cmd_flags & REQ_PREEMPT) == 0) { |
| 797 | /* there should be no pending command at this point */ |
| 798 | ide_unlock_port(hwif); |
| 799 | goto plug_device; |
| 800 | } |
| 801 | |
| 802 | hwgroup->rq = rq; |
| 803 | |
| 804 | spin_unlock_irq(&hwgroup->lock); |
| 805 | startstop = start_request(drive, rq); |
| 806 | spin_lock_irq(&hwgroup->lock); |
| 807 | |
| 808 | if (startstop == ide_stopped) |
| 809 | goto repeat; |
| 810 | } else |
| 811 | goto plug_device; |
| 812 | out: |
| 813 | spin_unlock_irq(&hwgroup->lock); |
| 814 | if (rq == NULL) |
| 815 | ide_unlock_host(host); |
| 816 | spin_lock_irq(q->queue_lock); |
| 817 | return; |
| 818 | |
| 819 | plug_device: |
| 820 | spin_unlock_irq(&hwgroup->lock); |
| 821 | ide_unlock_host(host); |
| 822 | plug_device_2: |
| 823 | spin_lock_irq(q->queue_lock); |
| 824 | |
| 825 | if (!elv_queue_empty(q)) |
| 826 | blk_plug_device(q); |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to |
| 831 | * retry the current request in pio mode instead of risking tossing it |
| 832 | * all away |
| 833 | */ |
| 834 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) |
| 835 | { |
| 836 | ide_hwif_t *hwif = HWIF(drive); |
| 837 | struct request *rq; |
| 838 | ide_startstop_t ret = ide_stopped; |
| 839 | |
| 840 | /* |
| 841 | * end current dma transaction |
| 842 | */ |
| 843 | |
| 844 | if (error < 0) { |
| 845 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); |
| 846 | (void)hwif->dma_ops->dma_end(drive); |
| 847 | ret = ide_error(drive, "dma timeout error", |
| 848 | hwif->tp_ops->read_status(hwif)); |
| 849 | } else { |
| 850 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); |
| 851 | hwif->dma_ops->dma_timeout(drive); |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * disable dma for now, but remember that we did so because of |
| 856 | * a timeout -- we'll reenable after we finish this next request |
| 857 | * (or rather the first chunk of it) in pio. |
| 858 | */ |
| 859 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
| 860 | drive->retry_pio++; |
| 861 | ide_dma_off_quietly(drive); |
| 862 | |
| 863 | /* |
| 864 | * un-busy drive etc and make sure request is sane |
| 865 | */ |
| 866 | |
| 867 | rq = HWGROUP(drive)->rq; |
| 868 | |
| 869 | if (!rq) |
| 870 | goto out; |
| 871 | |
| 872 | HWGROUP(drive)->rq = NULL; |
| 873 | |
| 874 | rq->errors = 0; |
| 875 | |
| 876 | if (!rq->bio) |
| 877 | goto out; |
| 878 | |
| 879 | rq->sector = rq->bio->bi_sector; |
| 880 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; |
| 881 | rq->hard_cur_sectors = rq->current_nr_sectors; |
| 882 | rq->buffer = bio_data(rq->bio); |
| 883 | out: |
| 884 | return ret; |
| 885 | } |
| 886 | |
| 887 | static void ide_plug_device(ide_drive_t *drive) |
| 888 | { |
| 889 | struct request_queue *q = drive->queue; |
| 890 | unsigned long flags; |
| 891 | |
| 892 | spin_lock_irqsave(q->queue_lock, flags); |
| 893 | if (!elv_queue_empty(q)) |
| 894 | blk_plug_device(q); |
| 895 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 896 | } |
| 897 | |
| 898 | /** |
| 899 | * ide_timer_expiry - handle lack of an IDE interrupt |
| 900 | * @data: timer callback magic (hwgroup) |
| 901 | * |
| 902 | * An IDE command has timed out before the expected drive return |
| 903 | * occurred. At this point we attempt to clean up the current |
| 904 | * mess. If the current handler includes an expiry handler then |
| 905 | * we invoke the expiry handler, and providing it is happy the |
| 906 | * work is done. If that fails we apply generic recovery rules |
| 907 | * invoking the handler and checking the drive DMA status. We |
| 908 | * have an excessively incestuous relationship with the DMA |
| 909 | * logic that wants cleaning up. |
| 910 | */ |
| 911 | |
| 912 | void ide_timer_expiry (unsigned long data) |
| 913 | { |
| 914 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; |
| 915 | ide_hwif_t *uninitialized_var(hwif); |
| 916 | ide_drive_t *uninitialized_var(drive); |
| 917 | ide_handler_t *handler; |
| 918 | ide_expiry_t *expiry; |
| 919 | unsigned long flags; |
| 920 | unsigned long wait = -1; |
| 921 | int plug_device = 0; |
| 922 | |
| 923 | spin_lock_irqsave(&hwgroup->lock, flags); |
| 924 | |
| 925 | if (((handler = hwgroup->handler) == NULL) || |
| 926 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { |
| 927 | /* |
| 928 | * Either a marginal timeout occurred |
| 929 | * (got the interrupt just as timer expired), |
| 930 | * or we were "sleeping" to give other devices a chance. |
| 931 | * Either way, we don't really want to complain about anything. |
| 932 | */ |
| 933 | } else { |
| 934 | drive = hwgroup->cur_dev; |
| 935 | if (!drive) { |
| 936 | printk(KERN_ERR "%s: ->cur_dev was NULL\n", __func__); |
| 937 | hwgroup->handler = NULL; |
| 938 | } else { |
| 939 | ide_startstop_t startstop = ide_stopped; |
| 940 | |
| 941 | if ((expiry = hwgroup->expiry) != NULL) { |
| 942 | /* continue */ |
| 943 | if ((wait = expiry(drive)) > 0) { |
| 944 | /* reset timer */ |
| 945 | hwgroup->timer.expires = jiffies + wait; |
| 946 | hwgroup->req_gen_timer = hwgroup->req_gen; |
| 947 | add_timer(&hwgroup->timer); |
| 948 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
| 949 | return; |
| 950 | } |
| 951 | } |
| 952 | hwgroup->handler = NULL; |
| 953 | /* |
| 954 | * We need to simulate a real interrupt when invoking |
| 955 | * the handler() function, which means we need to |
| 956 | * globally mask the specific IRQ: |
| 957 | */ |
| 958 | spin_unlock(&hwgroup->lock); |
| 959 | hwif = HWIF(drive); |
| 960 | /* disable_irq_nosync ?? */ |
| 961 | disable_irq(hwif->irq); |
| 962 | /* local CPU only, |
| 963 | * as if we were handling an interrupt */ |
| 964 | local_irq_disable(); |
| 965 | if (hwgroup->polling) { |
| 966 | startstop = handler(drive); |
| 967 | } else if (drive_is_ready(drive)) { |
| 968 | if (drive->waiting_for_dma) |
| 969 | hwif->dma_ops->dma_lost_irq(drive); |
| 970 | (void)ide_ack_intr(hwif); |
| 971 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); |
| 972 | startstop = handler(drive); |
| 973 | } else { |
| 974 | if (drive->waiting_for_dma) { |
| 975 | startstop = ide_dma_timeout_retry(drive, wait); |
| 976 | } else |
| 977 | startstop = |
| 978 | ide_error(drive, "irq timeout", |
| 979 | hwif->tp_ops->read_status(hwif)); |
| 980 | } |
| 981 | spin_lock_irq(&hwgroup->lock); |
| 982 | enable_irq(hwif->irq); |
| 983 | if (startstop == ide_stopped) { |
| 984 | ide_unlock_port(hwif); |
| 985 | plug_device = 1; |
| 986 | } |
| 987 | } |
| 988 | } |
| 989 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
| 990 | |
| 991 | if (plug_device) { |
| 992 | ide_unlock_host(hwif->host); |
| 993 | ide_plug_device(drive); |
| 994 | } |
| 995 | } |
| 996 | |
| 997 | /** |
| 998 | * unexpected_intr - handle an unexpected IDE interrupt |
| 999 | * @irq: interrupt line |
| 1000 | * @hwif: port being processed |
| 1001 | * |
| 1002 | * There's nothing really useful we can do with an unexpected interrupt, |
| 1003 | * other than reading the status register (to clear it), and logging it. |
| 1004 | * There should be no way that an irq can happen before we're ready for it, |
| 1005 | * so we needn't worry much about losing an "important" interrupt here. |
| 1006 | * |
| 1007 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever |
| 1008 | * the drive enters "idle", "standby", or "sleep" mode, so if the status |
| 1009 | * looks "good", we just ignore the interrupt completely. |
| 1010 | * |
| 1011 | * This routine assumes __cli() is in effect when called. |
| 1012 | * |
| 1013 | * If an unexpected interrupt happens on irq15 while we are handling irq14 |
| 1014 | * and if the two interfaces are "serialized" (CMD640), then it looks like |
| 1015 | * we could screw up by interfering with a new request being set up for |
| 1016 | * irq15. |
| 1017 | * |
| 1018 | * In reality, this is a non-issue. The new command is not sent unless |
| 1019 | * the drive is ready to accept one, in which case we know the drive is |
| 1020 | * not trying to interrupt us. And ide_set_handler() is always invoked |
| 1021 | * before completing the issuance of any new drive command, so we will not |
| 1022 | * be accidentally invoked as a result of any valid command completion |
| 1023 | * interrupt. |
| 1024 | */ |
| 1025 | |
| 1026 | static void unexpected_intr(int irq, ide_hwif_t *hwif) |
| 1027 | { |
| 1028 | u8 stat = hwif->tp_ops->read_status(hwif); |
| 1029 | |
| 1030 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
| 1031 | /* Try to not flood the console with msgs */ |
| 1032 | static unsigned long last_msgtime, count; |
| 1033 | ++count; |
| 1034 | |
| 1035 | if (time_after(jiffies, last_msgtime + HZ)) { |
| 1036 | last_msgtime = jiffies; |
| 1037 | printk(KERN_ERR "%s: unexpected interrupt, " |
| 1038 | "status=0x%02x, count=%ld\n", |
| 1039 | hwif->name, stat, count); |
| 1040 | } |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | /** |
| 1045 | * ide_intr - default IDE interrupt handler |
| 1046 | * @irq: interrupt number |
| 1047 | * @dev_id: hwif |
| 1048 | * @regs: unused weirdness from the kernel irq layer |
| 1049 | * |
| 1050 | * This is the default IRQ handler for the IDE layer. You should |
| 1051 | * not need to override it. If you do be aware it is subtle in |
| 1052 | * places |
| 1053 | * |
| 1054 | * hwif is the interface in the group currently performing |
| 1055 | * a command. hwgroup->cur_dev is the drive and hwgroup->handler is |
| 1056 | * the IRQ handler to call. As we issue a command the handlers |
| 1057 | * step through multiple states, reassigning the handler to the |
| 1058 | * next step in the process. Unlike a smart SCSI controller IDE |
| 1059 | * expects the main processor to sequence the various transfer |
| 1060 | * stages. We also manage a poll timer to catch up with most |
| 1061 | * timeout situations. There are still a few where the handlers |
| 1062 | * don't ever decide to give up. |
| 1063 | * |
| 1064 | * The handler eventually returns ide_stopped to indicate the |
| 1065 | * request completed. At this point we issue the next request |
| 1066 | * on the hwgroup and the process begins again. |
| 1067 | */ |
| 1068 | |
| 1069 | irqreturn_t ide_intr (int irq, void *dev_id) |
| 1070 | { |
| 1071 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
| 1072 | ide_hwgroup_t *hwgroup = hwif->hwgroup; |
| 1073 | ide_drive_t *uninitialized_var(drive); |
| 1074 | ide_handler_t *handler; |
| 1075 | unsigned long flags; |
| 1076 | ide_startstop_t startstop; |
| 1077 | irqreturn_t irq_ret = IRQ_NONE; |
| 1078 | int plug_device = 0; |
| 1079 | |
| 1080 | if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 1081 | if (hwif != hwif->host->cur_port) |
| 1082 | goto out_early; |
| 1083 | } |
| 1084 | |
| 1085 | spin_lock_irqsave(&hwgroup->lock, flags); |
| 1086 | |
| 1087 | if (!ide_ack_intr(hwif)) |
| 1088 | goto out; |
| 1089 | |
| 1090 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { |
| 1091 | /* |
| 1092 | * Not expecting an interrupt from this drive. |
| 1093 | * That means this could be: |
| 1094 | * (1) an interrupt from another PCI device |
| 1095 | * sharing the same PCI INT# as us. |
| 1096 | * or (2) a drive just entered sleep or standby mode, |
| 1097 | * and is interrupting to let us know. |
| 1098 | * or (3) a spurious interrupt of unknown origin. |
| 1099 | * |
| 1100 | * For PCI, we cannot tell the difference, |
| 1101 | * so in that case we just ignore it and hope it goes away. |
| 1102 | * |
| 1103 | * FIXME: unexpected_intr should be hwif-> then we can |
| 1104 | * remove all the ifdef PCI crap |
| 1105 | */ |
| 1106 | #ifdef CONFIG_BLK_DEV_IDEPCI |
| 1107 | if (hwif->chipset != ide_pci) |
| 1108 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| 1109 | { |
| 1110 | /* |
| 1111 | * Probably not a shared PCI interrupt, |
| 1112 | * so we can safely try to do something about it: |
| 1113 | */ |
| 1114 | unexpected_intr(irq, hwif); |
| 1115 | #ifdef CONFIG_BLK_DEV_IDEPCI |
| 1116 | } else { |
| 1117 | /* |
| 1118 | * Whack the status register, just in case |
| 1119 | * we have a leftover pending IRQ. |
| 1120 | */ |
| 1121 | (void)hwif->tp_ops->read_status(hwif); |
| 1122 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| 1123 | } |
| 1124 | goto out; |
| 1125 | } |
| 1126 | |
| 1127 | drive = hwgroup->cur_dev; |
| 1128 | if (!drive) { |
| 1129 | /* |
| 1130 | * This should NEVER happen, and there isn't much |
| 1131 | * we could do about it here. |
| 1132 | * |
| 1133 | * [Note - this can occur if the drive is hot unplugged] |
| 1134 | */ |
| 1135 | goto out_handled; |
| 1136 | } |
| 1137 | |
| 1138 | if (!drive_is_ready(drive)) |
| 1139 | /* |
| 1140 | * This happens regularly when we share a PCI IRQ with |
| 1141 | * another device. Unfortunately, it can also happen |
| 1142 | * with some buggy drives that trigger the IRQ before |
| 1143 | * their status register is up to date. Hopefully we have |
| 1144 | * enough advance overhead that the latter isn't a problem. |
| 1145 | */ |
| 1146 | goto out; |
| 1147 | |
| 1148 | hwgroup->handler = NULL; |
| 1149 | hwgroup->req_gen++; |
| 1150 | del_timer(&hwgroup->timer); |
| 1151 | spin_unlock(&hwgroup->lock); |
| 1152 | |
| 1153 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
| 1154 | hwif->port_ops->clear_irq(drive); |
| 1155 | |
| 1156 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
| 1157 | local_irq_enable_in_hardirq(); |
| 1158 | |
| 1159 | /* service this interrupt, may set handler for next interrupt */ |
| 1160 | startstop = handler(drive); |
| 1161 | |
| 1162 | spin_lock_irq(&hwgroup->lock); |
| 1163 | /* |
| 1164 | * Note that handler() may have set things up for another |
| 1165 | * interrupt to occur soon, but it cannot happen until |
| 1166 | * we exit from this routine, because it will be the |
| 1167 | * same irq as is currently being serviced here, and Linux |
| 1168 | * won't allow another of the same (on any CPU) until we return. |
| 1169 | */ |
| 1170 | if (startstop == ide_stopped) { |
| 1171 | if (hwgroup->handler == NULL) { /* paranoia */ |
| 1172 | ide_unlock_port(hwif); |
| 1173 | plug_device = 1; |
| 1174 | } else |
| 1175 | printk(KERN_ERR "%s: %s: huh? expected NULL handler " |
| 1176 | "on exit\n", __func__, drive->name); |
| 1177 | } |
| 1178 | out_handled: |
| 1179 | irq_ret = IRQ_HANDLED; |
| 1180 | out: |
| 1181 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
| 1182 | out_early: |
| 1183 | if (plug_device) { |
| 1184 | ide_unlock_host(hwif->host); |
| 1185 | ide_plug_device(drive); |
| 1186 | } |
| 1187 | |
| 1188 | return irq_ret; |
| 1189 | } |
| 1190 | |
| 1191 | /** |
| 1192 | * ide_do_drive_cmd - issue IDE special command |
| 1193 | * @drive: device to issue command |
| 1194 | * @rq: request to issue |
| 1195 | * |
| 1196 | * This function issues a special IDE device request |
| 1197 | * onto the request queue. |
| 1198 | * |
| 1199 | * the rq is queued at the head of the request queue, displacing |
| 1200 | * the currently-being-processed request and this function |
| 1201 | * returns immediately without waiting for the new rq to be |
| 1202 | * completed. This is VERY DANGEROUS, and is intended for |
| 1203 | * careful use by the ATAPI tape/cdrom driver code. |
| 1204 | */ |
| 1205 | |
| 1206 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) |
| 1207 | { |
| 1208 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
| 1209 | struct request_queue *q = drive->queue; |
| 1210 | unsigned long flags; |
| 1211 | |
| 1212 | hwgroup->rq = NULL; |
| 1213 | |
| 1214 | spin_lock_irqsave(q->queue_lock, flags); |
| 1215 | __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0); |
| 1216 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 1217 | } |
| 1218 | EXPORT_SYMBOL(ide_do_drive_cmd); |
| 1219 | |
| 1220 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) |
| 1221 | { |
| 1222 | ide_hwif_t *hwif = drive->hwif; |
| 1223 | ide_task_t task; |
| 1224 | |
| 1225 | memset(&task, 0, sizeof(task)); |
| 1226 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | |
| 1227 | IDE_TFLAG_OUT_FEATURE | tf_flags; |
| 1228 | task.tf.feature = dma; /* Use PIO/DMA */ |
| 1229 | task.tf.lbam = bcount & 0xff; |
| 1230 | task.tf.lbah = (bcount >> 8) & 0xff; |
| 1231 | |
| 1232 | ide_tf_dump(drive->name, &task.tf); |
| 1233 | hwif->tp_ops->set_irq(hwif, 1); |
| 1234 | SELECT_MASK(drive, 0); |
| 1235 | hwif->tp_ops->tf_load(drive, &task); |
| 1236 | } |
| 1237 | |
| 1238 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); |
| 1239 | |
| 1240 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
| 1241 | { |
| 1242 | ide_hwif_t *hwif = drive->hwif; |
| 1243 | u8 buf[4] = { 0 }; |
| 1244 | |
| 1245 | while (len > 0) { |
| 1246 | if (write) |
| 1247 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
| 1248 | else |
| 1249 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
| 1250 | len -= 4; |
| 1251 | } |
| 1252 | } |
| 1253 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |