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Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
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/completion.h> | |
44 | #include <linux/reboot.h> | |
45 | #include <linux/cdrom.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/device.h> | |
48 | #include <linux/kmod.h> | |
49 | #include <linux/scatterlist.h> | |
1977f032 | 50 | #include <linux/bitops.h> |
1da177e4 LT |
51 | |
52 | #include <asm/byteorder.h> | |
53 | #include <asm/irq.h> | |
54 | #include <asm/uaccess.h> | |
55 | #include <asm/io.h> | |
1da177e4 | 56 | |
a7ff7d41 | 57 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
bbc615b1 | 58 | int uptodate, unsigned int nr_bytes, int dequeue) |
1da177e4 LT |
59 | { |
60 | int ret = 1; | |
5e36bb6e KU |
61 | int error = 0; |
62 | ||
63 | if (uptodate <= 0) | |
64 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 65 | |
1da177e4 LT |
66 | /* |
67 | * if failfast is set on a request, override number of sectors and | |
68 | * complete the whole request right now | |
69 | */ | |
5e36bb6e | 70 | if (blk_noretry_request(rq) && error) |
41e9d344 | 71 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 72 | |
5e36bb6e | 73 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
74 | rq->errors = -EIO; |
75 | ||
76 | /* | |
77 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
78 | * if we DMA timeout more than 3 times, just stay in PIO | |
79 | */ | |
80 | if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) { | |
81 | drive->state = 0; | |
4a546e04 | 82 | ide_dma_on(drive); |
1da177e4 LT |
83 | } |
84 | ||
5e36bb6e KU |
85 | if (!__blk_end_request(rq, error, nr_bytes)) { |
86 | if (dequeue) | |
bbc615b1 | 87 | HWGROUP(drive)->rq = NULL; |
1da177e4 LT |
88 | ret = 0; |
89 | } | |
8672d571 | 90 | |
1da177e4 LT |
91 | return ret; |
92 | } | |
1da177e4 LT |
93 | |
94 | /** | |
95 | * ide_end_request - complete an IDE I/O | |
96 | * @drive: IDE device for the I/O | |
97 | * @uptodate: | |
98 | * @nr_sectors: number of sectors completed | |
99 | * | |
100 | * This is our end_request wrapper function. We complete the I/O | |
101 | * update random number input and dequeue the request, which if | |
102 | * it was tagged may be out of order. | |
103 | */ | |
104 | ||
105 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
106 | { | |
41e9d344 | 107 | unsigned int nr_bytes = nr_sectors << 9; |
1da177e4 LT |
108 | struct request *rq; |
109 | unsigned long flags; | |
110 | int ret = 1; | |
111 | ||
8672d571 JA |
112 | /* |
113 | * room for locking improvements here, the calls below don't | |
114 | * need the queue lock held at all | |
115 | */ | |
1da177e4 LT |
116 | spin_lock_irqsave(&ide_lock, flags); |
117 | rq = HWGROUP(drive)->rq; | |
118 | ||
41e9d344 JA |
119 | if (!nr_bytes) { |
120 | if (blk_pc_request(rq)) | |
121 | nr_bytes = rq->data_len; | |
122 | else | |
123 | nr_bytes = rq->hard_cur_sectors << 9; | |
124 | } | |
1da177e4 | 125 | |
bbc615b1 | 126 | ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
127 | |
128 | spin_unlock_irqrestore(&ide_lock, flags); | |
129 | return ret; | |
130 | } | |
131 | EXPORT_SYMBOL(ide_end_request); | |
132 | ||
133 | /* | |
134 | * Power Management state machine. This one is rather trivial for now, | |
135 | * we should probably add more, like switching back to PIO on suspend | |
136 | * to help some BIOSes, re-do the door locking on resume, etc... | |
137 | */ | |
138 | ||
139 | enum { | |
140 | ide_pm_flush_cache = ide_pm_state_start_suspend, | |
141 | idedisk_pm_standby, | |
142 | ||
8c2c0118 JL |
143 | idedisk_pm_restore_pio = ide_pm_state_start_resume, |
144 | idedisk_pm_idle, | |
1da177e4 LT |
145 | ide_pm_restore_dma, |
146 | }; | |
147 | ||
148 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) | |
149 | { | |
c00895ab | 150 | struct request_pm_state *pm = rq->data; |
ad3cadda | 151 | |
1da177e4 LT |
152 | if (drive->media != ide_disk) |
153 | return; | |
154 | ||
ad3cadda | 155 | switch (pm->pm_step) { |
1da177e4 | 156 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */ |
ad3cadda JA |
157 | if (pm->pm_state == PM_EVENT_FREEZE) |
158 | pm->pm_step = ide_pm_state_completed; | |
1da177e4 | 159 | else |
ad3cadda | 160 | pm->pm_step = idedisk_pm_standby; |
1da177e4 LT |
161 | break; |
162 | case idedisk_pm_standby: /* Suspend step 2 (standby) complete */ | |
ad3cadda | 163 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 164 | break; |
8c2c0118 JL |
165 | case idedisk_pm_restore_pio: /* Resume step 1 complete */ |
166 | pm->pm_step = idedisk_pm_idle; | |
167 | break; | |
168 | case idedisk_pm_idle: /* Resume step 2 (idle) complete */ | |
ad3cadda | 169 | pm->pm_step = ide_pm_restore_dma; |
1da177e4 LT |
170 | break; |
171 | } | |
172 | } | |
173 | ||
174 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
175 | { | |
c00895ab | 176 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
177 | ide_task_t *args = rq->special; |
178 | ||
179 | memset(args, 0, sizeof(*args)); | |
180 | ||
ad3cadda | 181 | switch (pm->pm_step) { |
1da177e4 LT |
182 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */ |
183 | if (drive->media != ide_disk) | |
184 | break; | |
185 | /* Not supported? Switch to next step now. */ | |
186 | if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) { | |
187 | ide_complete_power_step(drive, rq, 0, 0); | |
188 | return ide_stopped; | |
189 | } | |
190 | if (ide_id_has_flush_cache_ext(drive->id)) | |
650d841d | 191 | args->tf.command = WIN_FLUSH_CACHE_EXT; |
1da177e4 | 192 | else |
650d841d | 193 | args->tf.command = WIN_FLUSH_CACHE; |
74095a91 | 194 | goto out_do_tf; |
1da177e4 LT |
195 | |
196 | case idedisk_pm_standby: /* Suspend step 2 (standby) */ | |
650d841d | 197 | args->tf.command = WIN_STANDBYNOW1; |
74095a91 | 198 | goto out_do_tf; |
1da177e4 | 199 | |
8c2c0118 | 200 | case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */ |
26bcb879 | 201 | ide_set_max_pio(drive); |
317a46a2 BZ |
202 | /* |
203 | * skip idedisk_pm_idle for ATAPI devices | |
204 | */ | |
205 | if (drive->media != ide_disk) | |
206 | pm->pm_step = ide_pm_restore_dma; | |
207 | else | |
208 | ide_complete_power_step(drive, rq, 0, 0); | |
8c2c0118 JL |
209 | return ide_stopped; |
210 | ||
211 | case idedisk_pm_idle: /* Resume step 2 (idle) */ | |
650d841d | 212 | args->tf.command = WIN_IDLEIMMEDIATE; |
74095a91 | 213 | goto out_do_tf; |
1da177e4 | 214 | |
8c2c0118 | 215 | case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */ |
1da177e4 | 216 | /* |
0ae2e178 | 217 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
218 | * we could be smarter and check for current xfer_speed |
219 | * in struct drive etc... | |
220 | */ | |
5e37bdc0 | 221 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 222 | break; |
8987d21b BZ |
223 | /* |
224 | * TODO: respect ->using_dma setting | |
225 | */ | |
3608b5d7 | 226 | ide_set_dma(drive); |
1da177e4 LT |
227 | break; |
228 | } | |
ad3cadda | 229 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 230 | return ide_stopped; |
74095a91 BZ |
231 | |
232 | out_do_tf: | |
657cc1a8 | 233 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 234 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 235 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
236 | } |
237 | ||
dbe217af AC |
238 | /** |
239 | * ide_end_dequeued_request - complete an IDE I/O | |
240 | * @drive: IDE device for the I/O | |
241 | * @uptodate: | |
242 | * @nr_sectors: number of sectors completed | |
243 | * | |
244 | * Complete an I/O that is no longer on the request queue. This | |
245 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
246 | * We must still finish the old request but we must not tamper with the | |
247 | * queue in the meantime. | |
248 | * | |
249 | * NOTE: This path does not handle barrier, but barrier is not supported | |
250 | * on ide-cd anyway. | |
251 | */ | |
252 | ||
253 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
254 | int uptodate, int nr_sectors) | |
255 | { | |
256 | unsigned long flags; | |
bbc615b1 | 257 | int ret; |
dbe217af AC |
258 | |
259 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 260 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 261 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 262 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 263 | |
dbe217af AC |
264 | return ret; |
265 | } | |
266 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
267 | ||
268 | ||
1da177e4 LT |
269 | /** |
270 | * ide_complete_pm_request - end the current Power Management request | |
271 | * @drive: target drive | |
272 | * @rq: request | |
273 | * | |
274 | * This function cleans up the current PM request and stops the queue | |
275 | * if necessary. | |
276 | */ | |
277 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
278 | { | |
279 | unsigned long flags; | |
280 | ||
281 | #ifdef DEBUG_PM | |
282 | printk("%s: completing PM request, %s\n", drive->name, | |
283 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
284 | #endif | |
285 | spin_lock_irqsave(&ide_lock, flags); | |
286 | if (blk_pm_suspend_request(rq)) { | |
287 | blk_stop_queue(drive->queue); | |
288 | } else { | |
289 | drive->blocked = 0; | |
290 | blk_start_queue(drive->queue); | |
291 | } | |
1da177e4 | 292 | HWGROUP(drive)->rq = NULL; |
5e36bb6e KU |
293 | if (__blk_end_request(rq, 0, 0)) |
294 | BUG(); | |
1da177e4 LT |
295 | spin_unlock_irqrestore(&ide_lock, flags); |
296 | } | |
297 | ||
1da177e4 LT |
298 | /** |
299 | * ide_end_drive_cmd - end an explicit drive command | |
300 | * @drive: command | |
301 | * @stat: status bits | |
302 | * @err: error bits | |
303 | * | |
304 | * Clean up after success/failure of an explicit drive command. | |
305 | * These get thrown onto the queue so they are synchronized with | |
306 | * real I/O operations on the drive. | |
307 | * | |
308 | * In LBA48 mode we have to read the register set twice to get | |
309 | * all the extra information out. | |
310 | */ | |
311 | ||
312 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
313 | { | |
1da177e4 LT |
314 | unsigned long flags; |
315 | struct request *rq; | |
316 | ||
317 | spin_lock_irqsave(&ide_lock, flags); | |
318 | rq = HWGROUP(drive)->rq; | |
319 | spin_unlock_irqrestore(&ide_lock, flags); | |
320 | ||
7267c337 | 321 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
322 | ide_task_t *task = (ide_task_t *)rq->special; |
323 | ||
1da177e4 | 324 | if (rq->errors == 0) |
395d8ef5 BZ |
325 | rq->errors = !OK_STAT(stat, READY_STAT, BAD_STAT); |
326 | ||
327 | if (task) { | |
328 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 329 | |
650d841d | 330 | tf->error = err; |
650d841d | 331 | tf->status = stat; |
1da177e4 | 332 | |
94cd5b62 | 333 | drive->hwif->tf_read(drive, task); |
395d8ef5 BZ |
334 | |
335 | if (task->tf_flags & IDE_TFLAG_DYN) | |
336 | kfree(task); | |
1da177e4 LT |
337 | } |
338 | } else if (blk_pm_request(rq)) { | |
c00895ab | 339 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
340 | #ifdef DEBUG_PM |
341 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
342 | drive->name, rq->pm->pm_step, stat, err); | |
343 | #endif | |
344 | ide_complete_power_step(drive, rq, stat, err); | |
ad3cadda | 345 | if (pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
346 | ide_complete_pm_request(drive, rq); |
347 | return; | |
348 | } | |
349 | ||
350 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
351 | HWGROUP(drive)->rq = NULL; |
352 | rq->errors = err; | |
3b0e044d KU |
353 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
354 | blk_rq_bytes(rq)))) | |
5e36bb6e | 355 | BUG(); |
1da177e4 LT |
356 | spin_unlock_irqrestore(&ide_lock, flags); |
357 | } | |
358 | ||
359 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
360 | ||
1da177e4 LT |
361 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
362 | { | |
363 | if (rq->rq_disk) { | |
364 | ide_driver_t *drv; | |
365 | ||
366 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
367 | drv->end_request(drive, 0, 0); | |
368 | } else | |
369 | ide_end_request(drive, 0, 0); | |
370 | } | |
371 | ||
372 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
373 | { | |
374 | ide_hwif_t *hwif = drive->hwif; | |
375 | ||
376 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
377 | /* other bits are useless when BUSY */ | |
378 | rq->errors |= ERROR_RESET; | |
379 | } else if (stat & ERR_STAT) { | |
380 | /* err has different meaning on cdrom and tape */ | |
381 | if (err == ABRT_ERR) { | |
382 | if (drive->select.b.lba && | |
383 | /* some newer drives don't support WIN_SPECIFY */ | |
4c3032d8 | 384 | hwif->INB(hwif->io_ports.command_addr) == |
23579a2a | 385 | WIN_SPECIFY) |
1da177e4 LT |
386 | return ide_stopped; |
387 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
388 | /* UDMA crc error, just retry the operation */ | |
389 | drive->crc_count++; | |
390 | } else if (err & (BBD_ERR | ECC_ERR)) { | |
391 | /* retries won't help these */ | |
392 | rq->errors = ERROR_MAX; | |
393 | } else if (err & TRK0_ERR) { | |
394 | /* help it find track zero */ | |
395 | rq->errors |= ERROR_RECAL; | |
396 | } | |
397 | } | |
398 | ||
ed67b923 | 399 | if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ && |
57279a7a BZ |
400 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
401 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
402 | ||
403 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
404 | } | |
1da177e4 | 405 | |
513daadd SS |
406 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
407 | ide_kill_rq(drive, rq); | |
408 | return ide_stopped; | |
409 | } | |
410 | ||
c47137a9 | 411 | if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT)) |
513daadd | 412 | rq->errors |= ERROR_RESET; |
1da177e4 | 413 | |
513daadd | 414 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 415 | ++rq->errors; |
513daadd | 416 | return ide_do_reset(drive); |
1da177e4 | 417 | } |
513daadd SS |
418 | |
419 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
420 | drive->special.b.recalibrate = 1; | |
421 | ||
422 | ++rq->errors; | |
423 | ||
1da177e4 LT |
424 | return ide_stopped; |
425 | } | |
426 | ||
427 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
428 | { | |
429 | ide_hwif_t *hwif = drive->hwif; | |
430 | ||
431 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
432 | /* other bits are useless when BUSY */ | |
433 | rq->errors |= ERROR_RESET; | |
434 | } else { | |
435 | /* add decoding error stuff */ | |
436 | } | |
437 | ||
c47137a9 | 438 | if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT)) |
1da177e4 | 439 | /* force an abort */ |
f8c4bd0a | 440 | hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE, |
32b3fe4f | 441 | hwif->io_ports.command_addr); |
1da177e4 LT |
442 | |
443 | if (rq->errors >= ERROR_MAX) { | |
444 | ide_kill_rq(drive, rq); | |
445 | } else { | |
446 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
447 | ++rq->errors; | |
448 | return ide_do_reset(drive); | |
449 | } | |
450 | ++rq->errors; | |
451 | } | |
452 | ||
453 | return ide_stopped; | |
454 | } | |
455 | ||
456 | ide_startstop_t | |
457 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
458 | { | |
459 | if (drive->media == ide_disk) | |
460 | return ide_ata_error(drive, rq, stat, err); | |
461 | return ide_atapi_error(drive, rq, stat, err); | |
462 | } | |
463 | ||
464 | EXPORT_SYMBOL_GPL(__ide_error); | |
465 | ||
466 | /** | |
467 | * ide_error - handle an error on the IDE | |
468 | * @drive: drive the error occurred on | |
469 | * @msg: message to report | |
470 | * @stat: status bits | |
471 | * | |
472 | * ide_error() takes action based on the error returned by the drive. | |
473 | * For normal I/O that may well include retries. We deal with | |
474 | * both new-style (taskfile) and old style command handling here. | |
475 | * In the case of taskfile command handling there is work left to | |
476 | * do | |
477 | */ | |
478 | ||
479 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
480 | { | |
481 | struct request *rq; | |
482 | u8 err; | |
483 | ||
484 | err = ide_dump_status(drive, msg, stat); | |
485 | ||
486 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
487 | return ide_stopped; | |
488 | ||
489 | /* retry only "normal" I/O: */ | |
4aff5e23 | 490 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
491 | rq->errors = 1; |
492 | ide_end_drive_cmd(drive, stat, err); | |
493 | return ide_stopped; | |
494 | } | |
495 | ||
496 | if (rq->rq_disk) { | |
497 | ide_driver_t *drv; | |
498 | ||
499 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
500 | return drv->error(drive, rq, stat, err); | |
501 | } else | |
502 | return __ide_error(drive, rq, stat, err); | |
503 | } | |
504 | ||
505 | EXPORT_SYMBOL_GPL(ide_error); | |
506 | ||
507 | ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq) | |
508 | { | |
509 | if (drive->media != ide_disk) | |
510 | rq->errors |= ERROR_RESET; | |
511 | ||
512 | ide_kill_rq(drive, rq); | |
513 | ||
514 | return ide_stopped; | |
515 | } | |
516 | ||
517 | EXPORT_SYMBOL_GPL(__ide_abort); | |
518 | ||
519 | /** | |
338cec32 | 520 | * ide_abort - abort pending IDE operations |
1da177e4 LT |
521 | * @drive: drive the error occurred on |
522 | * @msg: message to report | |
523 | * | |
524 | * ide_abort kills and cleans up when we are about to do a | |
525 | * host initiated reset on active commands. Longer term we | |
526 | * want handlers to have sensible abort handling themselves | |
527 | * | |
528 | * This differs fundamentally from ide_error because in | |
529 | * this case the command is doing just fine when we | |
530 | * blow it away. | |
531 | */ | |
532 | ||
533 | ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg) | |
534 | { | |
535 | struct request *rq; | |
536 | ||
537 | if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL) | |
538 | return ide_stopped; | |
539 | ||
540 | /* retry only "normal" I/O: */ | |
4aff5e23 | 541 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
542 | rq->errors = 1; |
543 | ide_end_drive_cmd(drive, BUSY_STAT, 0); | |
544 | return ide_stopped; | |
545 | } | |
546 | ||
547 | if (rq->rq_disk) { | |
548 | ide_driver_t *drv; | |
549 | ||
550 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
551 | return drv->abort(drive, rq); | |
552 | } else | |
553 | return __ide_abort(drive, rq); | |
554 | } | |
555 | ||
57d7366b | 556 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 557 | { |
57d7366b BZ |
558 | tf->nsect = drive->sect; |
559 | tf->lbal = drive->sect; | |
560 | tf->lbam = drive->cyl; | |
561 | tf->lbah = drive->cyl >> 8; | |
562 | tf->device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA; | |
563 | tf->command = WIN_SPECIFY; | |
1da177e4 LT |
564 | } |
565 | ||
57d7366b | 566 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 567 | { |
57d7366b BZ |
568 | tf->nsect = drive->sect; |
569 | tf->command = WIN_RESTORE; | |
1da177e4 LT |
570 | } |
571 | ||
57d7366b | 572 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 573 | { |
57d7366b BZ |
574 | tf->nsect = drive->mult_req; |
575 | tf->command = WIN_SETMULT; | |
1da177e4 LT |
576 | } |
577 | ||
578 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
579 | { | |
580 | special_t *s = &drive->special; | |
581 | ide_task_t args; | |
582 | ||
583 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 584 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
585 | |
586 | if (s->b.set_geometry) { | |
587 | s->b.set_geometry = 0; | |
57d7366b | 588 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
589 | } else if (s->b.recalibrate) { |
590 | s->b.recalibrate = 0; | |
57d7366b | 591 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
592 | } else if (s->b.set_multmode) { |
593 | s->b.set_multmode = 0; | |
594 | if (drive->mult_req > drive->id->max_multsect) | |
595 | drive->mult_req = drive->id->max_multsect; | |
57d7366b | 596 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
597 | } else if (s->all) { |
598 | int special = s->all; | |
599 | s->all = 0; | |
600 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
601 | return ide_stopped; | |
602 | } | |
603 | ||
657cc1a8 | 604 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 605 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 606 | |
1da177e4 LT |
607 | do_rw_taskfile(drive, &args); |
608 | ||
609 | return ide_started; | |
610 | } | |
611 | ||
26bcb879 BZ |
612 | /* |
613 | * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away | |
614 | */ | |
615 | static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) | |
616 | { | |
617 | switch (req_pio) { | |
618 | case 202: | |
619 | case 201: | |
620 | case 200: | |
621 | case 102: | |
622 | case 101: | |
623 | case 100: | |
624 | return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; | |
625 | case 9: | |
626 | case 8: | |
627 | return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; | |
628 | case 7: | |
629 | case 6: | |
630 | return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; | |
631 | default: | |
632 | return 0; | |
633 | } | |
634 | } | |
635 | ||
1da177e4 LT |
636 | /** |
637 | * do_special - issue some special commands | |
638 | * @drive: drive the command is for | |
639 | * | |
640 | * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT | |
641 | * commands to a drive. It used to do much more, but has been scaled | |
642 | * back. | |
643 | */ | |
644 | ||
645 | static ide_startstop_t do_special (ide_drive_t *drive) | |
646 | { | |
647 | special_t *s = &drive->special; | |
648 | ||
649 | #ifdef DEBUG | |
650 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
651 | #endif | |
652 | if (s->b.set_tune) { | |
26bcb879 | 653 | ide_hwif_t *hwif = drive->hwif; |
ac95beed | 654 | const struct ide_port_ops *port_ops = hwif->port_ops; |
26bcb879 BZ |
655 | u8 req_pio = drive->tune_req; |
656 | ||
1da177e4 | 657 | s->b.set_tune = 0; |
26bcb879 BZ |
658 | |
659 | if (set_pio_mode_abuse(drive->hwif, req_pio)) { | |
d393aa03 BZ |
660 | /* |
661 | * take ide_lock for drive->[no_]unmask/[no_]io_32bit | |
662 | */ | |
663 | if (req_pio == 8 || req_pio == 9) { | |
664 | unsigned long flags; | |
665 | ||
666 | spin_lock_irqsave(&ide_lock, flags); | |
ac95beed | 667 | port_ops->set_pio_mode(drive, req_pio); |
d393aa03 BZ |
668 | spin_unlock_irqrestore(&ide_lock, flags); |
669 | } else | |
ac95beed | 670 | port_ops->set_pio_mode(drive, req_pio); |
aedea591 BZ |
671 | } else { |
672 | int keep_dma = drive->using_dma; | |
673 | ||
26bcb879 BZ |
674 | ide_set_pio(drive, req_pio); |
675 | ||
aedea591 BZ |
676 | if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { |
677 | if (keep_dma) | |
4a546e04 | 678 | ide_dma_on(drive); |
aedea591 BZ |
679 | } |
680 | } | |
681 | ||
1da177e4 LT |
682 | return ide_stopped; |
683 | } else { | |
684 | if (drive->media == ide_disk) | |
685 | return ide_disk_special(drive); | |
686 | ||
687 | s->all = 0; | |
688 | drive->mult_req = 0; | |
689 | return ide_stopped; | |
690 | } | |
691 | } | |
692 | ||
693 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
694 | { | |
695 | ide_hwif_t *hwif = drive->hwif; | |
696 | struct scatterlist *sg = hwif->sg_table; | |
697 | ||
698 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
699 | return; | |
700 | ||
4aff5e23 | 701 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
702 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
703 | } else { | |
704 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
705 | hwif->sg_nents = 1; | |
706 | } | |
707 | } | |
708 | ||
709 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
710 | ||
711 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
712 | { | |
713 | ide_hwif_t *hwif = drive->hwif; | |
714 | ||
715 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
716 | hwif->cursg_ofs = 0; |
717 | hwif->cursg = NULL; | |
1da177e4 LT |
718 | } |
719 | ||
720 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
721 | ||
722 | /** | |
723 | * execute_drive_command - issue special drive command | |
338cec32 | 724 | * @drive: the drive to issue the command on |
1da177e4 LT |
725 | * @rq: the request structure holding the command |
726 | * | |
727 | * execute_drive_cmd() issues a special drive command, usually | |
728 | * initiated by ioctl() from the external hdparm program. The | |
729 | * command can be a drive command, drive task or taskfile | |
730 | * operation. Weirdly you can call it with NULL to wait for | |
731 | * all commands to finish. Don't do this as that is due to change | |
732 | */ | |
733 | ||
734 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
735 | struct request *rq) | |
736 | { | |
737 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 738 | ide_task_t *task = rq->special; |
1da177e4 | 739 | |
7267c337 | 740 | if (task) { |
21d535c9 | 741 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
742 | |
743 | switch (hwif->data_phase) { | |
744 | case TASKFILE_MULTI_OUT: | |
745 | case TASKFILE_OUT: | |
746 | case TASKFILE_MULTI_IN: | |
747 | case TASKFILE_IN: | |
748 | ide_init_sg_cmd(drive, rq); | |
749 | ide_map_sg(drive, rq); | |
750 | default: | |
751 | break; | |
752 | } | |
74095a91 | 753 | |
21d535c9 BZ |
754 | return do_rw_taskfile(drive, task); |
755 | } | |
756 | ||
1da177e4 LT |
757 | /* |
758 | * NULL is actually a valid way of waiting for | |
759 | * all current requests to be flushed from the queue. | |
760 | */ | |
761 | #ifdef DEBUG | |
762 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
763 | #endif | |
64a57fe4 BZ |
764 | ide_end_drive_cmd(drive, ide_read_status(drive), ide_read_error(drive)); |
765 | ||
1da177e4 LT |
766 | return ide_stopped; |
767 | } | |
768 | ||
ad3cadda JA |
769 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
770 | { | |
c00895ab | 771 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
772 | |
773 | if (blk_pm_suspend_request(rq) && | |
774 | pm->pm_step == ide_pm_state_start_suspend) | |
775 | /* Mark drive blocked when starting the suspend sequence. */ | |
776 | drive->blocked = 1; | |
777 | else if (blk_pm_resume_request(rq) && | |
778 | pm->pm_step == ide_pm_state_start_resume) { | |
779 | /* | |
780 | * The first thing we do on wakeup is to wait for BSY bit to | |
781 | * go away (with a looong timeout) as a drive on this hwif may | |
782 | * just be POSTing itself. | |
783 | * We do that before even selecting as the "other" device on | |
784 | * the bus may be broken enough to walk on our toes at this | |
785 | * point. | |
786 | */ | |
787 | int rc; | |
788 | #ifdef DEBUG_PM | |
789 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
790 | #endif | |
791 | rc = ide_wait_not_busy(HWIF(drive), 35000); | |
792 | if (rc) | |
793 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
794 | SELECT_DRIVE(drive); | |
81ca6919 | 795 | ide_set_irq(drive, 1); |
178184b6 | 796 | rc = ide_wait_not_busy(HWIF(drive), 100000); |
ad3cadda JA |
797 | if (rc) |
798 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
799 | } | |
800 | } | |
801 | ||
1da177e4 LT |
802 | /** |
803 | * start_request - start of I/O and command issuing for IDE | |
804 | * | |
805 | * start_request() initiates handling of a new I/O request. It | |
806 | * accepts commands and I/O (read/write) requests. It also does | |
807 | * the final remapping for weird stuff like EZDrive. Once | |
808 | * device mapper can work sector level the EZDrive stuff can go away | |
809 | * | |
810 | * FIXME: this function needs a rename | |
811 | */ | |
812 | ||
813 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
814 | { | |
815 | ide_startstop_t startstop; | |
816 | sector_t block; | |
817 | ||
4aff5e23 | 818 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
819 | |
820 | #ifdef DEBUG | |
821 | printk("%s: start_request: current=0x%08lx\n", | |
822 | HWIF(drive)->name, (unsigned long) rq); | |
823 | #endif | |
824 | ||
825 | /* bail early if we've exceeded max_failures */ | |
826 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 827 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
828 | goto kill_rq; |
829 | } | |
830 | ||
831 | block = rq->sector; | |
832 | if (blk_fs_request(rq) && | |
833 | (drive->media == ide_disk || drive->media == ide_floppy)) { | |
834 | block += drive->sect0; | |
835 | } | |
836 | /* Yecch - this will shift the entire interval, | |
837 | possibly killing some innocent following sector */ | |
838 | if (block == 0 && drive->remap_0_to_1 == 1) | |
839 | block = 1; /* redirect MBR access to EZ-Drive partn table */ | |
840 | ||
ad3cadda JA |
841 | if (blk_pm_request(rq)) |
842 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
843 | |
844 | SELECT_DRIVE(drive); | |
845 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) { | |
846 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); | |
847 | return startstop; | |
848 | } | |
849 | if (!drive->special.all) { | |
850 | ide_driver_t *drv; | |
851 | ||
513daadd SS |
852 | /* |
853 | * We reset the drive so we need to issue a SETFEATURES. | |
854 | * Do it _after_ do_special() restored device parameters. | |
855 | */ | |
856 | if (drive->current_speed == 0xff) | |
857 | ide_config_drive_speed(drive, drive->desired_speed); | |
858 | ||
7267c337 | 859 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
860 | return execute_drive_cmd(drive, rq); |
861 | else if (blk_pm_request(rq)) { | |
c00895ab | 862 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
863 | #ifdef DEBUG_PM |
864 | printk("%s: start_power_step(step: %d)\n", | |
865 | drive->name, rq->pm->pm_step); | |
866 | #endif | |
867 | startstop = ide_start_power_step(drive, rq); | |
868 | if (startstop == ide_stopped && | |
ad3cadda | 869 | pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
870 | ide_complete_pm_request(drive, rq); |
871 | return startstop; | |
872 | } | |
873 | ||
874 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
875 | return drv->do_request(drive, rq, block); | |
876 | } | |
877 | return do_special(drive); | |
878 | kill_rq: | |
879 | ide_kill_rq(drive, rq); | |
880 | return ide_stopped; | |
881 | } | |
882 | ||
883 | /** | |
884 | * ide_stall_queue - pause an IDE device | |
885 | * @drive: drive to stall | |
886 | * @timeout: time to stall for (jiffies) | |
887 | * | |
888 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
889 | * to the hwgroup by sleeping for timeout jiffies. | |
890 | */ | |
891 | ||
892 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
893 | { | |
894 | if (timeout > WAIT_WORSTCASE) | |
895 | timeout = WAIT_WORSTCASE; | |
896 | drive->sleep = timeout + jiffies; | |
897 | drive->sleeping = 1; | |
898 | } | |
899 | ||
900 | EXPORT_SYMBOL(ide_stall_queue); | |
901 | ||
902 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
903 | ||
904 | /** | |
905 | * choose_drive - select a drive to service | |
906 | * @hwgroup: hardware group to select on | |
907 | * | |
908 | * choose_drive() selects the next drive which will be serviced. | |
909 | * This is necessary because the IDE layer can't issue commands | |
910 | * to both drives on the same cable, unlike SCSI. | |
911 | */ | |
912 | ||
913 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
914 | { | |
915 | ide_drive_t *drive, *best; | |
916 | ||
917 | repeat: | |
918 | best = NULL; | |
919 | drive = hwgroup->drive; | |
920 | ||
921 | /* | |
922 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
923 | * though that is 3 requests, it must be seen as a single transaction. | |
924 | * we must not preempt this drive until that is complete | |
925 | */ | |
926 | if (blk_queue_flushing(drive->queue)) { | |
927 | /* | |
928 | * small race where queue could get replugged during | |
929 | * the 3-request flush cycle, just yank the plug since | |
930 | * we want it to finish asap | |
931 | */ | |
932 | blk_remove_plug(drive->queue); | |
933 | return drive; | |
934 | } | |
935 | ||
936 | do { | |
937 | if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep)) | |
938 | && !elv_queue_empty(drive->queue)) { | |
939 | if (!best | |
940 | || (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep))) | |
941 | || (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best)))) | |
942 | { | |
943 | if (!blk_queue_plugged(drive->queue)) | |
944 | best = drive; | |
945 | } | |
946 | } | |
947 | } while ((drive = drive->next) != hwgroup->drive); | |
948 | if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
949 | long t = (signed long)(WAKEUP(best) - jiffies); | |
950 | if (t >= WAIT_MIN_SLEEP) { | |
951 | /* | |
952 | * We *may* have some time to spare, but first let's see if | |
953 | * someone can potentially benefit from our nice mood today.. | |
954 | */ | |
955 | drive = best->next; | |
956 | do { | |
957 | if (!drive->sleeping | |
958 | && time_before(jiffies - best->service_time, WAKEUP(drive)) | |
959 | && time_before(WAKEUP(drive), jiffies + t)) | |
960 | { | |
961 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
962 | goto repeat; | |
963 | } | |
964 | } while ((drive = drive->next) != best); | |
965 | } | |
966 | } | |
967 | return best; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Issue a new request to a drive from hwgroup | |
972 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
973 | * | |
974 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
975 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
976 | * may have both interfaces in a single hwgroup to "serialize" access. | |
977 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
978 | * together into one hwgroup for serialized access. | |
979 | * | |
980 | * Note also that several hwgroups can end up sharing a single IRQ, | |
981 | * possibly along with many other devices. This is especially common in | |
982 | * PCI-based systems with off-board IDE controller cards. | |
983 | * | |
984 | * The IDE driver uses the single global ide_lock spinlock to protect | |
985 | * access to the request queues, and to protect the hwgroup->busy flag. | |
986 | * | |
987 | * The first thread into the driver for a particular hwgroup sets the | |
988 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
989 | * and then initiates processing of the top request from the request queue. | |
990 | * | |
991 | * Other threads attempting entry notice the busy setting, and will simply | |
992 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
993 | * remains set even when the driver is merely awaiting the next interrupt. | |
994 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
995 | * | |
996 | * When processing of a request completes, the completing thread or IRQ-handler | |
997 | * will start the next request from the queue. If no more work remains, | |
998 | * the driver will clear the hwgroup->busy flag and exit. | |
999 | * | |
1000 | * The ide_lock (spinlock) is used to protect all access to the | |
1001 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
1002 | * the driver. This makes the driver much more friendlier to shared IRQs | |
1003 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
1004 | */ | |
1005 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
1006 | { | |
1007 | ide_drive_t *drive; | |
1008 | ide_hwif_t *hwif; | |
1009 | struct request *rq; | |
1010 | ide_startstop_t startstop; | |
867f8b4e | 1011 | int loops = 0; |
1da177e4 LT |
1012 | |
1013 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
1014 | ide_get_lock(ide_intr, hwgroup); | |
1015 | ||
1016 | /* caller must own ide_lock */ | |
1017 | BUG_ON(!irqs_disabled()); | |
1018 | ||
1019 | while (!hwgroup->busy) { | |
1020 | hwgroup->busy = 1; | |
1021 | drive = choose_drive(hwgroup); | |
1022 | if (drive == NULL) { | |
1023 | int sleeping = 0; | |
1024 | unsigned long sleep = 0; /* shut up, gcc */ | |
1025 | hwgroup->rq = NULL; | |
1026 | drive = hwgroup->drive; | |
1027 | do { | |
1028 | if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) { | |
1029 | sleeping = 1; | |
1030 | sleep = drive->sleep; | |
1031 | } | |
1032 | } while ((drive = drive->next) != hwgroup->drive); | |
1033 | if (sleeping) { | |
1034 | /* | |
1035 | * Take a short snooze, and then wake up this hwgroup again. | |
1036 | * This gives other hwgroups on the same a chance to | |
1037 | * play fairly with us, just in case there are big differences | |
1038 | * in relative throughputs.. don't want to hog the cpu too much. | |
1039 | */ | |
1040 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1041 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1042 | #if 1 | |
1043 | if (timer_pending(&hwgroup->timer)) | |
1044 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1045 | #endif | |
1046 | /* so that ide_timer_expiry knows what to do */ | |
1047 | hwgroup->sleeping = 1; | |
23450319 | 1048 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1049 | mod_timer(&hwgroup->timer, sleep); |
1050 | /* we purposely leave hwgroup->busy==1 | |
1051 | * while sleeping */ | |
1052 | } else { | |
1053 | /* Ugly, but how can we sleep for the lock | |
1054 | * otherwise? perhaps from tq_disk? | |
1055 | */ | |
1056 | ||
1057 | /* for atari only */ | |
1058 | ide_release_lock(); | |
1059 | hwgroup->busy = 0; | |
1060 | } | |
1061 | ||
1062 | /* no more work for this hwgroup (for now) */ | |
1063 | return; | |
1064 | } | |
867f8b4e | 1065 | again: |
1da177e4 | 1066 | hwif = HWIF(drive); |
81ca6919 | 1067 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1068 | /* |
1069 | * set nIEN for previous hwif, drives in the | |
1070 | * quirk_list may not like intr setups/cleanups | |
1071 | */ | |
1072 | if (drive->quirk_list != 1) | |
81ca6919 | 1073 | ide_set_irq(drive, 0); |
1da177e4 LT |
1074 | } |
1075 | hwgroup->hwif = hwif; | |
1076 | hwgroup->drive = drive; | |
1077 | drive->sleeping = 0; | |
1078 | drive->service_start = jiffies; | |
1079 | ||
1080 | if (blk_queue_plugged(drive->queue)) { | |
1081 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1082 | break; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * we know that the queue isn't empty, but this can happen | |
1087 | * if the q->prep_rq_fn() decides to kill a request | |
1088 | */ | |
1089 | rq = elv_next_request(drive->queue); | |
1090 | if (!rq) { | |
1091 | hwgroup->busy = 0; | |
1092 | break; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Sanity: don't accept a request that isn't a PM request | |
1097 | * if we are currently power managed. This is very important as | |
1098 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1099 | * above to return us whatever is in the queue. Since we call | |
1100 | * ide_do_request() ourselves, we end up taking requests while | |
1101 | * the queue is blocked... | |
1102 | * | |
1103 | * We let requests forced at head of queue with ide-preempt | |
1104 | * though. I hope that doesn't happen too much, hopefully not | |
1105 | * unless the subdriver triggers such a thing in its own PM | |
1106 | * state machine. | |
867f8b4e BH |
1107 | * |
1108 | * We count how many times we loop here to make sure we service | |
1109 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1110 | */ |
4aff5e23 | 1111 | if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) { |
867f8b4e BH |
1112 | drive = drive->next ? drive->next : hwgroup->drive; |
1113 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1114 | goto again; | |
1da177e4 LT |
1115 | /* We clear busy, there should be no pending ATA command at this point. */ |
1116 | hwgroup->busy = 0; | |
1117 | break; | |
1118 | } | |
1119 | ||
1120 | hwgroup->rq = rq; | |
1121 | ||
1122 | /* | |
1123 | * Some systems have trouble with IDE IRQs arriving while | |
1124 | * the driver is still setting things up. So, here we disable | |
1125 | * the IRQ used by this interface while the request is being started. | |
1126 | * This may look bad at first, but pretty much the same thing | |
1127 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1128 | * -- the kernel masks the IRQ while it is being handled. | |
1129 | */ | |
1130 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1131 | disable_irq_nosync(hwif->irq); | |
1132 | spin_unlock(&ide_lock); | |
366c7f55 | 1133 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1134 | /* allow other IRQs while we start this request */ |
1135 | startstop = start_request(drive, rq); | |
1136 | spin_lock_irq(&ide_lock); | |
1137 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1138 | enable_irq(hwif->irq); | |
1139 | if (startstop == ide_stopped) | |
1140 | hwgroup->busy = 0; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * Passes the stuff to ide_do_request | |
1146 | */ | |
165125e1 | 1147 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1148 | { |
1149 | ide_drive_t *drive = q->queuedata; | |
1150 | ||
1151 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1156 | * retry the current request in pio mode instead of risking tossing it | |
1157 | * all away | |
1158 | */ | |
1159 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1160 | { | |
1161 | ide_hwif_t *hwif = HWIF(drive); | |
1162 | struct request *rq; | |
1163 | ide_startstop_t ret = ide_stopped; | |
1164 | ||
1165 | /* | |
1166 | * end current dma transaction | |
1167 | */ | |
1168 | ||
1169 | if (error < 0) { | |
1170 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1171 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1172 | ret = ide_error(drive, "dma timeout error", |
c47137a9 | 1173 | ide_read_status(drive)); |
1da177e4 LT |
1174 | } else { |
1175 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1176 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | /* | |
1180 | * disable dma for now, but remember that we did so because of | |
1181 | * a timeout -- we'll reenable after we finish this next request | |
1182 | * (or rather the first chunk of it) in pio. | |
1183 | */ | |
1184 | drive->retry_pio++; | |
1185 | drive->state = DMA_PIO_RETRY; | |
4a546e04 | 1186 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1187 | |
1188 | /* | |
1189 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1190 | * make sure request is sane | |
1191 | */ | |
1192 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1193 | |
1194 | if (!rq) | |
1195 | goto out; | |
1196 | ||
1da177e4 LT |
1197 | HWGROUP(drive)->rq = NULL; |
1198 | ||
1199 | rq->errors = 0; | |
1200 | ||
1201 | if (!rq->bio) | |
1202 | goto out; | |
1203 | ||
1204 | rq->sector = rq->bio->bi_sector; | |
1205 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1206 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1207 | rq->buffer = bio_data(rq->bio); | |
1208 | out: | |
1209 | return ret; | |
1210 | } | |
1211 | ||
1212 | /** | |
1213 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1214 | * @data: timer callback magic (hwgroup) | |
1215 | * | |
1216 | * An IDE command has timed out before the expected drive return | |
1217 | * occurred. At this point we attempt to clean up the current | |
1218 | * mess. If the current handler includes an expiry handler then | |
1219 | * we invoke the expiry handler, and providing it is happy the | |
1220 | * work is done. If that fails we apply generic recovery rules | |
1221 | * invoking the handler and checking the drive DMA status. We | |
1222 | * have an excessively incestuous relationship with the DMA | |
1223 | * logic that wants cleaning up. | |
1224 | */ | |
1225 | ||
1226 | void ide_timer_expiry (unsigned long data) | |
1227 | { | |
1228 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1229 | ide_handler_t *handler; | |
1230 | ide_expiry_t *expiry; | |
1231 | unsigned long flags; | |
1232 | unsigned long wait = -1; | |
1233 | ||
1234 | spin_lock_irqsave(&ide_lock, flags); | |
1235 | ||
23450319 SS |
1236 | if (((handler = hwgroup->handler) == NULL) || |
1237 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1238 | /* |
1239 | * Either a marginal timeout occurred | |
1240 | * (got the interrupt just as timer expired), | |
1241 | * or we were "sleeping" to give other devices a chance. | |
1242 | * Either way, we don't really want to complain about anything. | |
1243 | */ | |
1244 | if (hwgroup->sleeping) { | |
1245 | hwgroup->sleeping = 0; | |
1246 | hwgroup->busy = 0; | |
1247 | } | |
1248 | } else { | |
1249 | ide_drive_t *drive = hwgroup->drive; | |
1250 | if (!drive) { | |
1251 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1252 | hwgroup->handler = NULL; | |
1253 | } else { | |
1254 | ide_hwif_t *hwif; | |
1255 | ide_startstop_t startstop = ide_stopped; | |
1256 | if (!hwgroup->busy) { | |
1257 | hwgroup->busy = 1; /* paranoia */ | |
1258 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1259 | } | |
1260 | if ((expiry = hwgroup->expiry) != NULL) { | |
1261 | /* continue */ | |
1262 | if ((wait = expiry(drive)) > 0) { | |
1263 | /* reset timer */ | |
1264 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1265 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1266 | add_timer(&hwgroup->timer); |
1267 | spin_unlock_irqrestore(&ide_lock, flags); | |
1268 | return; | |
1269 | } | |
1270 | } | |
1271 | hwgroup->handler = NULL; | |
1272 | /* | |
1273 | * We need to simulate a real interrupt when invoking | |
1274 | * the handler() function, which means we need to | |
1275 | * globally mask the specific IRQ: | |
1276 | */ | |
1277 | spin_unlock(&ide_lock); | |
1278 | hwif = HWIF(drive); | |
1da177e4 LT |
1279 | /* disable_irq_nosync ?? */ |
1280 | disable_irq(hwif->irq); | |
1da177e4 LT |
1281 | /* local CPU only, |
1282 | * as if we were handling an interrupt */ | |
1283 | local_irq_disable(); | |
1284 | if (hwgroup->polling) { | |
1285 | startstop = handler(drive); | |
1286 | } else if (drive_is_ready(drive)) { | |
1287 | if (drive->waiting_for_dma) | |
5e37bdc0 | 1288 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1289 | (void)ide_ack_intr(hwif); |
1290 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1291 | startstop = handler(drive); | |
1292 | } else { | |
1293 | if (drive->waiting_for_dma) { | |
1294 | startstop = ide_dma_timeout_retry(drive, wait); | |
1295 | } else | |
1296 | startstop = | |
c47137a9 BZ |
1297 | ide_error(drive, "irq timeout", |
1298 | ide_read_status(drive)); | |
1da177e4 LT |
1299 | } |
1300 | drive->service_time = jiffies - drive->service_start; | |
1301 | spin_lock_irq(&ide_lock); | |
1302 | enable_irq(hwif->irq); | |
1303 | if (startstop == ide_stopped) | |
1304 | hwgroup->busy = 0; | |
1305 | } | |
1306 | } | |
1307 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1308 | spin_unlock_irqrestore(&ide_lock, flags); | |
1309 | } | |
1310 | ||
1311 | /** | |
1312 | * unexpected_intr - handle an unexpected IDE interrupt | |
1313 | * @irq: interrupt line | |
1314 | * @hwgroup: hwgroup being processed | |
1315 | * | |
1316 | * There's nothing really useful we can do with an unexpected interrupt, | |
1317 | * other than reading the status register (to clear it), and logging it. | |
1318 | * There should be no way that an irq can happen before we're ready for it, | |
1319 | * so we needn't worry much about losing an "important" interrupt here. | |
1320 | * | |
1321 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1322 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1323 | * looks "good", we just ignore the interrupt completely. | |
1324 | * | |
1325 | * This routine assumes __cli() is in effect when called. | |
1326 | * | |
1327 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1328 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1329 | * we could screw up by interfering with a new request being set up for | |
1330 | * irq15. | |
1331 | * | |
1332 | * In reality, this is a non-issue. The new command is not sent unless | |
1333 | * the drive is ready to accept one, in which case we know the drive is | |
1334 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1335 | * before completing the issuance of any new drive command, so we will not | |
1336 | * be accidentally invoked as a result of any valid command completion | |
1337 | * interrupt. | |
1338 | * | |
1339 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1340 | * is doing the current command, but we don't know which hwif burped | |
1341 | * mysteriously. | |
1342 | */ | |
1343 | ||
1344 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1345 | { | |
1346 | u8 stat; | |
1347 | ide_hwif_t *hwif = hwgroup->hwif; | |
1348 | ||
1349 | /* | |
1350 | * handle the unexpected interrupt | |
1351 | */ | |
1352 | do { | |
1353 | if (hwif->irq == irq) { | |
4c3032d8 | 1354 | stat = hwif->INB(hwif->io_ports.status_addr); |
1da177e4 LT |
1355 | if (!OK_STAT(stat, READY_STAT, BAD_STAT)) { |
1356 | /* Try to not flood the console with msgs */ | |
1357 | static unsigned long last_msgtime, count; | |
1358 | ++count; | |
1359 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1360 | last_msgtime = jiffies; | |
1361 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1362 | "status=0x%02x, count=%ld\n", | |
1363 | hwif->name, | |
1364 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1365 | } | |
1366 | } | |
1367 | } | |
1368 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1369 | } | |
1370 | ||
1371 | /** | |
1372 | * ide_intr - default IDE interrupt handler | |
1373 | * @irq: interrupt number | |
1374 | * @dev_id: hwif group | |
1375 | * @regs: unused weirdness from the kernel irq layer | |
1376 | * | |
1377 | * This is the default IRQ handler for the IDE layer. You should | |
1378 | * not need to override it. If you do be aware it is subtle in | |
1379 | * places | |
1380 | * | |
1381 | * hwgroup->hwif is the interface in the group currently performing | |
1382 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1383 | * the IRQ handler to call. As we issue a command the handlers | |
1384 | * step through multiple states, reassigning the handler to the | |
1385 | * next step in the process. Unlike a smart SCSI controller IDE | |
1386 | * expects the main processor to sequence the various transfer | |
1387 | * stages. We also manage a poll timer to catch up with most | |
1388 | * timeout situations. There are still a few where the handlers | |
1389 | * don't ever decide to give up. | |
1390 | * | |
1391 | * The handler eventually returns ide_stopped to indicate the | |
1392 | * request completed. At this point we issue the next request | |
1393 | * on the hwgroup and the process begins again. | |
1394 | */ | |
1395 | ||
7d12e780 | 1396 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1397 | { |
1398 | unsigned long flags; | |
1399 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1400 | ide_hwif_t *hwif; | |
1401 | ide_drive_t *drive; | |
1402 | ide_handler_t *handler; | |
1403 | ide_startstop_t startstop; | |
1404 | ||
1405 | spin_lock_irqsave(&ide_lock, flags); | |
1406 | hwif = hwgroup->hwif; | |
1407 | ||
1408 | if (!ide_ack_intr(hwif)) { | |
1409 | spin_unlock_irqrestore(&ide_lock, flags); | |
1410 | return IRQ_NONE; | |
1411 | } | |
1412 | ||
1413 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1414 | /* | |
1415 | * Not expecting an interrupt from this drive. | |
1416 | * That means this could be: | |
1417 | * (1) an interrupt from another PCI device | |
1418 | * sharing the same PCI INT# as us. | |
1419 | * or (2) a drive just entered sleep or standby mode, | |
1420 | * and is interrupting to let us know. | |
1421 | * or (3) a spurious interrupt of unknown origin. | |
1422 | * | |
1423 | * For PCI, we cannot tell the difference, | |
1424 | * so in that case we just ignore it and hope it goes away. | |
1425 | * | |
1426 | * FIXME: unexpected_intr should be hwif-> then we can | |
1427 | * remove all the ifdef PCI crap | |
1428 | */ | |
1429 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1430 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1431 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1432 | { | |
1433 | /* | |
1434 | * Probably not a shared PCI interrupt, | |
1435 | * so we can safely try to do something about it: | |
1436 | */ | |
1437 | unexpected_intr(irq, hwgroup); | |
1438 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1439 | } else { | |
1440 | /* | |
1441 | * Whack the status register, just in case | |
1442 | * we have a leftover pending IRQ. | |
1443 | */ | |
4c3032d8 | 1444 | (void) hwif->INB(hwif->io_ports.status_addr); |
1da177e4 LT |
1445 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1446 | } | |
1447 | spin_unlock_irqrestore(&ide_lock, flags); | |
1448 | return IRQ_NONE; | |
1449 | } | |
1450 | drive = hwgroup->drive; | |
1451 | if (!drive) { | |
1452 | /* | |
1453 | * This should NEVER happen, and there isn't much | |
1454 | * we could do about it here. | |
1455 | * | |
1456 | * [Note - this can occur if the drive is hot unplugged] | |
1457 | */ | |
1458 | spin_unlock_irqrestore(&ide_lock, flags); | |
1459 | return IRQ_HANDLED; | |
1460 | } | |
1461 | if (!drive_is_ready(drive)) { | |
1462 | /* | |
1463 | * This happens regularly when we share a PCI IRQ with | |
1464 | * another device. Unfortunately, it can also happen | |
1465 | * with some buggy drives that trigger the IRQ before | |
1466 | * their status register is up to date. Hopefully we have | |
1467 | * enough advance overhead that the latter isn't a problem. | |
1468 | */ | |
1469 | spin_unlock_irqrestore(&ide_lock, flags); | |
1470 | return IRQ_NONE; | |
1471 | } | |
1472 | if (!hwgroup->busy) { | |
1473 | hwgroup->busy = 1; /* paranoia */ | |
1474 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1475 | } | |
1476 | hwgroup->handler = NULL; | |
23450319 | 1477 | hwgroup->req_gen++; |
1da177e4 LT |
1478 | del_timer(&hwgroup->timer); |
1479 | spin_unlock(&ide_lock); | |
1480 | ||
f0dd8712 AL |
1481 | /* Some controllers might set DMA INTR no matter DMA or PIO; |
1482 | * bmdma status might need to be cleared even for | |
1483 | * PIO interrupts to prevent spurious/lost irq. | |
1484 | */ | |
1485 | if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma)) | |
1486 | /* ide_dma_end() needs bmdma status for error checking. | |
1487 | * So, skip clearing bmdma status here and leave it | |
1488 | * to ide_dma_end() if this is dma interrupt. | |
1489 | */ | |
1490 | hwif->ide_dma_clear_irq(drive); | |
1491 | ||
1da177e4 | 1492 | if (drive->unmask) |
366c7f55 | 1493 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1494 | /* service this interrupt, may set handler for next interrupt */ |
1495 | startstop = handler(drive); | |
1496 | spin_lock_irq(&ide_lock); | |
1497 | ||
1498 | /* | |
1499 | * Note that handler() may have set things up for another | |
1500 | * interrupt to occur soon, but it cannot happen until | |
1501 | * we exit from this routine, because it will be the | |
1502 | * same irq as is currently being serviced here, and Linux | |
1503 | * won't allow another of the same (on any CPU) until we return. | |
1504 | */ | |
1505 | drive->service_time = jiffies - drive->service_start; | |
1506 | if (startstop == ide_stopped) { | |
1507 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1508 | hwgroup->busy = 0; | |
1509 | ide_do_request(hwgroup, hwif->irq); | |
1510 | } else { | |
1511 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1512 | "on exit\n", drive->name); | |
1513 | } | |
1514 | } | |
1515 | spin_unlock_irqrestore(&ide_lock, flags); | |
1516 | return IRQ_HANDLED; | |
1517 | } | |
1518 | ||
1da177e4 LT |
1519 | /** |
1520 | * ide_do_drive_cmd - issue IDE special command | |
1521 | * @drive: device to issue command | |
1522 | * @rq: request to issue | |
1523 | * @action: action for processing | |
1524 | * | |
1525 | * This function issues a special IDE device request | |
1526 | * onto the request queue. | |
1527 | * | |
1528 | * If action is ide_wait, then the rq is queued at the end of the | |
1529 | * request queue, and the function sleeps until it has been processed. | |
1530 | * This is for use when invoked from an ioctl handler. | |
1531 | * | |
1532 | * If action is ide_preempt, then the rq is queued at the head of | |
1533 | * the request queue, displacing the currently-being-processed | |
1534 | * request and this function returns immediately without waiting | |
1535 | * for the new rq to be completed. This is VERY DANGEROUS, and is | |
1536 | * intended for careful use by the ATAPI tape/cdrom driver code. | |
1537 | * | |
1da177e4 LT |
1538 | * If action is ide_end, then the rq is queued at the end of the |
1539 | * request queue, and the function returns immediately without waiting | |
1540 | * for the new rq to be completed. This is again intended for careful | |
1541 | * use by the ATAPI tape/cdrom driver code. | |
1542 | */ | |
1543 | ||
1544 | int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action) | |
1545 | { | |
1546 | unsigned long flags; | |
1547 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
5f2e1cee | 1548 | int where = ELEVATOR_INSERT_BACK; |
1da177e4 LT |
1549 | |
1550 | rq->errors = 0; | |
1da177e4 | 1551 | |
5f2e1cee | 1552 | if (action == ide_preempt) |
e8a96aa7 BZ |
1553 | where = ELEVATOR_INSERT_FRONT; |
1554 | ||
1da177e4 LT |
1555 | spin_lock_irqsave(&ide_lock, flags); |
1556 | if (action == ide_preempt) | |
1557 | hwgroup->rq = NULL; | |
c6866a6f BZ |
1558 | __elv_add_request(drive->queue, rq, where, 1); |
1559 | __generic_unplug_device(drive->queue); | |
1560 | /* the queue is stopped so it won't be plugged+unplugged */ | |
1561 | if (blk_pm_resume_request(rq)) | |
1562 | do_ide_request(drive->queue); | |
1da177e4 LT |
1563 | spin_unlock_irqrestore(&ide_lock, flags); |
1564 | ||
5f2e1cee | 1565 | return 0; |
1da177e4 LT |
1566 | } |
1567 | ||
1568 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1569 | |
1570 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1571 | { | |
1572 | ide_task_t task; | |
1573 | ||
1574 | memset(&task, 0, sizeof(task)); | |
1575 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1576 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1577 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1578 | task.tf.lbam = bcount & 0xff; | |
1579 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1580 | ||
089c5c7e | 1581 | ide_tf_dump(drive->name, &task.tf); |
ed4af48f BZ |
1582 | ide_set_irq(drive, 1); |
1583 | SELECT_MASK(drive, 0); | |
94cd5b62 | 1584 | drive->hwif->tf_load(drive, &task); |
2fc57388 BZ |
1585 | } |
1586 | ||
1587 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1588 | |
1589 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1590 | { | |
1591 | ide_hwif_t *hwif = drive->hwif; | |
1592 | u8 buf[4] = { 0 }; | |
1593 | ||
1594 | while (len > 0) { | |
1595 | if (write) | |
1596 | hwif->output_data(drive, NULL, buf, min(4, len)); | |
1597 | else | |
1598 | hwif->input_data(drive, NULL, buf, min(4, len)); | |
1599 | len -= 4; | |
1600 | } | |
1601 | } | |
1602 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |