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; | |
61 | ||
1da177e4 LT |
62 | /* |
63 | * if failfast is set on a request, override number of sectors and | |
64 | * complete the whole request right now | |
65 | */ | |
66 | if (blk_noretry_request(rq) && end_io_error(uptodate)) | |
41e9d344 | 67 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 LT |
68 | |
69 | if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors) | |
70 | rq->errors = -EIO; | |
71 | ||
72 | /* | |
73 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
74 | * if we DMA timeout more than 3 times, just stay in PIO | |
75 | */ | |
76 | if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) { | |
77 | drive->state = 0; | |
4a546e04 | 78 | ide_dma_on(drive); |
1da177e4 LT |
79 | } |
80 | ||
41e9d344 | 81 | if (!end_that_request_chunk(rq, uptodate, nr_bytes)) { |
ba027def | 82 | add_disk_randomness(rq->rq_disk); |
bbc615b1 BZ |
83 | if (dequeue) { |
84 | if (!list_empty(&rq->queuelist)) | |
85 | blkdev_dequeue_request(rq); | |
86 | HWGROUP(drive)->rq = NULL; | |
87 | } | |
ba027def | 88 | end_that_request_last(rq, uptodate); |
1da177e4 LT |
89 | ret = 0; |
90 | } | |
8672d571 | 91 | |
1da177e4 LT |
92 | return ret; |
93 | } | |
1da177e4 LT |
94 | |
95 | /** | |
96 | * ide_end_request - complete an IDE I/O | |
97 | * @drive: IDE device for the I/O | |
98 | * @uptodate: | |
99 | * @nr_sectors: number of sectors completed | |
100 | * | |
101 | * This is our end_request wrapper function. We complete the I/O | |
102 | * update random number input and dequeue the request, which if | |
103 | * it was tagged may be out of order. | |
104 | */ | |
105 | ||
106 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
107 | { | |
41e9d344 | 108 | unsigned int nr_bytes = nr_sectors << 9; |
1da177e4 LT |
109 | struct request *rq; |
110 | unsigned long flags; | |
111 | int ret = 1; | |
112 | ||
8672d571 JA |
113 | /* |
114 | * room for locking improvements here, the calls below don't | |
115 | * need the queue lock held at all | |
116 | */ | |
1da177e4 LT |
117 | spin_lock_irqsave(&ide_lock, flags); |
118 | rq = HWGROUP(drive)->rq; | |
119 | ||
41e9d344 JA |
120 | if (!nr_bytes) { |
121 | if (blk_pc_request(rq)) | |
122 | nr_bytes = rq->data_len; | |
123 | else | |
124 | nr_bytes = rq->hard_cur_sectors << 9; | |
125 | } | |
1da177e4 | 126 | |
bbc615b1 | 127 | ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
128 | |
129 | spin_unlock_irqrestore(&ide_lock, flags); | |
130 | return ret; | |
131 | } | |
132 | EXPORT_SYMBOL(ide_end_request); | |
133 | ||
134 | /* | |
135 | * Power Management state machine. This one is rather trivial for now, | |
136 | * we should probably add more, like switching back to PIO on suspend | |
137 | * to help some BIOSes, re-do the door locking on resume, etc... | |
138 | */ | |
139 | ||
140 | enum { | |
141 | ide_pm_flush_cache = ide_pm_state_start_suspend, | |
142 | idedisk_pm_standby, | |
143 | ||
8c2c0118 JL |
144 | idedisk_pm_restore_pio = ide_pm_state_start_resume, |
145 | idedisk_pm_idle, | |
1da177e4 LT |
146 | ide_pm_restore_dma, |
147 | }; | |
148 | ||
149 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) | |
150 | { | |
c00895ab | 151 | struct request_pm_state *pm = rq->data; |
ad3cadda | 152 | |
1da177e4 LT |
153 | if (drive->media != ide_disk) |
154 | return; | |
155 | ||
ad3cadda | 156 | switch (pm->pm_step) { |
1da177e4 | 157 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */ |
ad3cadda JA |
158 | if (pm->pm_state == PM_EVENT_FREEZE) |
159 | pm->pm_step = ide_pm_state_completed; | |
1da177e4 | 160 | else |
ad3cadda | 161 | pm->pm_step = idedisk_pm_standby; |
1da177e4 LT |
162 | break; |
163 | case idedisk_pm_standby: /* Suspend step 2 (standby) complete */ | |
ad3cadda | 164 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 165 | break; |
8c2c0118 JL |
166 | case idedisk_pm_restore_pio: /* Resume step 1 complete */ |
167 | pm->pm_step = idedisk_pm_idle; | |
168 | break; | |
169 | case idedisk_pm_idle: /* Resume step 2 (idle) complete */ | |
ad3cadda | 170 | pm->pm_step = ide_pm_restore_dma; |
1da177e4 LT |
171 | break; |
172 | } | |
173 | } | |
174 | ||
175 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
176 | { | |
c00895ab | 177 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
178 | ide_task_t *args = rq->special; |
179 | ||
180 | memset(args, 0, sizeof(*args)); | |
181 | ||
ad3cadda | 182 | switch (pm->pm_step) { |
1da177e4 LT |
183 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */ |
184 | if (drive->media != ide_disk) | |
185 | break; | |
186 | /* Not supported? Switch to next step now. */ | |
187 | if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) { | |
188 | ide_complete_power_step(drive, rq, 0, 0); | |
189 | return ide_stopped; | |
190 | } | |
191 | if (ide_id_has_flush_cache_ext(drive->id)) | |
650d841d | 192 | args->tf.command = WIN_FLUSH_CACHE_EXT; |
1da177e4 | 193 | else |
650d841d | 194 | args->tf.command = WIN_FLUSH_CACHE; |
74095a91 | 195 | goto out_do_tf; |
1da177e4 LT |
196 | |
197 | case idedisk_pm_standby: /* Suspend step 2 (standby) */ | |
650d841d | 198 | args->tf.command = WIN_STANDBYNOW1; |
74095a91 | 199 | goto out_do_tf; |
1da177e4 | 200 | |
8c2c0118 | 201 | case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */ |
26bcb879 | 202 | ide_set_max_pio(drive); |
317a46a2 BZ |
203 | /* |
204 | * skip idedisk_pm_idle for ATAPI devices | |
205 | */ | |
206 | if (drive->media != ide_disk) | |
207 | pm->pm_step = ide_pm_restore_dma; | |
208 | else | |
209 | ide_complete_power_step(drive, rq, 0, 0); | |
8c2c0118 JL |
210 | return ide_stopped; |
211 | ||
212 | case idedisk_pm_idle: /* Resume step 2 (idle) */ | |
650d841d | 213 | args->tf.command = WIN_IDLEIMMEDIATE; |
74095a91 | 214 | goto out_do_tf; |
1da177e4 | 215 | |
8c2c0118 | 216 | case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */ |
1da177e4 | 217 | /* |
0ae2e178 | 218 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
219 | * we could be smarter and check for current xfer_speed |
220 | * in struct drive etc... | |
221 | */ | |
15ce926a | 222 | if (drive->hwif->dma_host_set == NULL) |
1da177e4 | 223 | break; |
8987d21b BZ |
224 | /* |
225 | * TODO: respect ->using_dma setting | |
226 | */ | |
3608b5d7 | 227 | ide_set_dma(drive); |
1da177e4 LT |
228 | break; |
229 | } | |
ad3cadda | 230 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 231 | return ide_stopped; |
74095a91 BZ |
232 | |
233 | out_do_tf: | |
657cc1a8 | 234 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 235 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 236 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
237 | } |
238 | ||
dbe217af AC |
239 | /** |
240 | * ide_end_dequeued_request - complete an IDE I/O | |
241 | * @drive: IDE device for the I/O | |
242 | * @uptodate: | |
243 | * @nr_sectors: number of sectors completed | |
244 | * | |
245 | * Complete an I/O that is no longer on the request queue. This | |
246 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
247 | * We must still finish the old request but we must not tamper with the | |
248 | * queue in the meantime. | |
249 | * | |
250 | * NOTE: This path does not handle barrier, but barrier is not supported | |
251 | * on ide-cd anyway. | |
252 | */ | |
253 | ||
254 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
255 | int uptodate, int nr_sectors) | |
256 | { | |
257 | unsigned long flags; | |
bbc615b1 | 258 | int ret; |
dbe217af AC |
259 | |
260 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 261 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 262 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 263 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 264 | |
dbe217af AC |
265 | return ret; |
266 | } | |
267 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
268 | ||
269 | ||
1da177e4 LT |
270 | /** |
271 | * ide_complete_pm_request - end the current Power Management request | |
272 | * @drive: target drive | |
273 | * @rq: request | |
274 | * | |
275 | * This function cleans up the current PM request and stops the queue | |
276 | * if necessary. | |
277 | */ | |
278 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
279 | { | |
280 | unsigned long flags; | |
281 | ||
282 | #ifdef DEBUG_PM | |
283 | printk("%s: completing PM request, %s\n", drive->name, | |
284 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
285 | #endif | |
286 | spin_lock_irqsave(&ide_lock, flags); | |
287 | if (blk_pm_suspend_request(rq)) { | |
288 | blk_stop_queue(drive->queue); | |
289 | } else { | |
290 | drive->blocked = 0; | |
291 | blk_start_queue(drive->queue); | |
292 | } | |
293 | blkdev_dequeue_request(rq); | |
294 | HWGROUP(drive)->rq = NULL; | |
8ffdc655 | 295 | end_that_request_last(rq, 1); |
1da177e4 LT |
296 | spin_unlock_irqrestore(&ide_lock, flags); |
297 | } | |
298 | ||
c2b57cdc BZ |
299 | void ide_tf_read(ide_drive_t *drive, ide_task_t *task) |
300 | { | |
301 | ide_hwif_t *hwif = drive->hwif; | |
302 | struct ide_taskfile *tf = &task->tf; | |
303 | ||
304 | if (task->tf_flags & IDE_TFLAG_IN_DATA) { | |
305 | u16 data = hwif->INW(IDE_DATA_REG); | |
306 | ||
307 | tf->data = data & 0xff; | |
308 | tf->hob_data = (data >> 8) & 0xff; | |
309 | } | |
310 | ||
311 | /* be sure we're looking at the low order bits */ | |
312 | hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG); | |
313 | ||
314 | if (task->tf_flags & IDE_TFLAG_IN_NSECT) | |
315 | tf->nsect = hwif->INB(IDE_NSECTOR_REG); | |
316 | if (task->tf_flags & IDE_TFLAG_IN_LBAL) | |
317 | tf->lbal = hwif->INB(IDE_SECTOR_REG); | |
318 | if (task->tf_flags & IDE_TFLAG_IN_LBAM) | |
319 | tf->lbam = hwif->INB(IDE_LCYL_REG); | |
320 | if (task->tf_flags & IDE_TFLAG_IN_LBAH) | |
321 | tf->lbah = hwif->INB(IDE_HCYL_REG); | |
322 | if (task->tf_flags & IDE_TFLAG_IN_DEVICE) | |
323 | tf->device = hwif->INB(IDE_SELECT_REG); | |
324 | ||
325 | if (task->tf_flags & IDE_TFLAG_LBA48) { | |
326 | hwif->OUTB(drive->ctl | 0x80, IDE_CONTROL_REG); | |
327 | ||
328 | if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) | |
329 | tf->hob_feature = hwif->INB(IDE_FEATURE_REG); | |
330 | if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) | |
331 | tf->hob_nsect = hwif->INB(IDE_NSECTOR_REG); | |
332 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) | |
333 | tf->hob_lbal = hwif->INB(IDE_SECTOR_REG); | |
334 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) | |
335 | tf->hob_lbam = hwif->INB(IDE_LCYL_REG); | |
336 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) | |
337 | tf->hob_lbah = hwif->INB(IDE_HCYL_REG); | |
338 | } | |
339 | } | |
340 | ||
1da177e4 LT |
341 | /** |
342 | * ide_end_drive_cmd - end an explicit drive command | |
343 | * @drive: command | |
344 | * @stat: status bits | |
345 | * @err: error bits | |
346 | * | |
347 | * Clean up after success/failure of an explicit drive command. | |
348 | * These get thrown onto the queue so they are synchronized with | |
349 | * real I/O operations on the drive. | |
350 | * | |
351 | * In LBA48 mode we have to read the register set twice to get | |
352 | * all the extra information out. | |
353 | */ | |
354 | ||
355 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
356 | { | |
357 | ide_hwif_t *hwif = HWIF(drive); | |
358 | unsigned long flags; | |
359 | struct request *rq; | |
360 | ||
361 | spin_lock_irqsave(&ide_lock, flags); | |
362 | rq = HWGROUP(drive)->rq; | |
363 | spin_unlock_irqrestore(&ide_lock, flags); | |
364 | ||
4aff5e23 | 365 | if (rq->cmd_type == REQ_TYPE_ATA_CMD) { |
1da177e4 LT |
366 | u8 *args = (u8 *) rq->buffer; |
367 | if (rq->errors == 0) | |
368 | rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT); | |
369 | ||
370 | if (args) { | |
371 | args[0] = stat; | |
372 | args[1] = err; | |
49c746ee BZ |
373 | /* be sure we're looking at the low order bits */ |
374 | hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG); | |
1da177e4 LT |
375 | args[2] = hwif->INB(IDE_NSECTOR_REG); |
376 | } | |
4aff5e23 | 377 | } else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
378 | ide_task_t *args = (ide_task_t *) rq->special; |
379 | if (rq->errors == 0) | |
380 | rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT); | |
381 | ||
382 | if (args) { | |
650d841d BZ |
383 | struct ide_taskfile *tf = &args->tf; |
384 | ||
650d841d | 385 | tf->error = err; |
650d841d | 386 | tf->status = stat; |
1da177e4 | 387 | |
c2b57cdc | 388 | ide_tf_read(drive, args); |
1da177e4 LT |
389 | } |
390 | } else if (blk_pm_request(rq)) { | |
c00895ab | 391 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
392 | #ifdef DEBUG_PM |
393 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
394 | drive->name, rq->pm->pm_step, stat, err); | |
395 | #endif | |
396 | ide_complete_power_step(drive, rq, stat, err); | |
ad3cadda | 397 | if (pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
398 | ide_complete_pm_request(drive, rq); |
399 | return; | |
400 | } | |
401 | ||
402 | spin_lock_irqsave(&ide_lock, flags); | |
403 | blkdev_dequeue_request(rq); | |
404 | HWGROUP(drive)->rq = NULL; | |
405 | rq->errors = err; | |
8ffdc655 | 406 | end_that_request_last(rq, !rq->errors); |
1da177e4 LT |
407 | spin_unlock_irqrestore(&ide_lock, flags); |
408 | } | |
409 | ||
410 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
411 | ||
412 | /** | |
413 | * try_to_flush_leftover_data - flush junk | |
414 | * @drive: drive to flush | |
415 | * | |
416 | * try_to_flush_leftover_data() is invoked in response to a drive | |
417 | * unexpectedly having its DRQ_STAT bit set. As an alternative to | |
418 | * resetting the drive, this routine tries to clear the condition | |
419 | * by read a sector's worth of data from the drive. Of course, | |
420 | * this may not help if the drive is *waiting* for data from *us*. | |
421 | */ | |
422 | static void try_to_flush_leftover_data (ide_drive_t *drive) | |
423 | { | |
424 | int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS; | |
425 | ||
426 | if (drive->media != ide_disk) | |
427 | return; | |
428 | while (i > 0) { | |
429 | u32 buffer[16]; | |
430 | u32 wcount = (i > 16) ? 16 : i; | |
431 | ||
432 | i -= wcount; | |
433 | HWIF(drive)->ata_input_data(drive, buffer, wcount); | |
434 | } | |
435 | } | |
436 | ||
437 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) | |
438 | { | |
439 | if (rq->rq_disk) { | |
440 | ide_driver_t *drv; | |
441 | ||
442 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
443 | drv->end_request(drive, 0, 0); | |
444 | } else | |
445 | ide_end_request(drive, 0, 0); | |
446 | } | |
447 | ||
448 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
449 | { | |
450 | ide_hwif_t *hwif = drive->hwif; | |
451 | ||
452 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
453 | /* other bits are useless when BUSY */ | |
454 | rq->errors |= ERROR_RESET; | |
455 | } else if (stat & ERR_STAT) { | |
456 | /* err has different meaning on cdrom and tape */ | |
457 | if (err == ABRT_ERR) { | |
458 | if (drive->select.b.lba && | |
459 | /* some newer drives don't support WIN_SPECIFY */ | |
460 | hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY) | |
461 | return ide_stopped; | |
462 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
463 | /* UDMA crc error, just retry the operation */ | |
464 | drive->crc_count++; | |
465 | } else if (err & (BBD_ERR | ECC_ERR)) { | |
466 | /* retries won't help these */ | |
467 | rq->errors = ERROR_MAX; | |
468 | } else if (err & TRK0_ERR) { | |
469 | /* help it find track zero */ | |
470 | rq->errors |= ERROR_RECAL; | |
471 | } | |
472 | } | |
473 | ||
ed67b923 BZ |
474 | if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ && |
475 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) | |
1da177e4 LT |
476 | try_to_flush_leftover_data(drive); |
477 | ||
513daadd SS |
478 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
479 | ide_kill_rq(drive, rq); | |
480 | return ide_stopped; | |
481 | } | |
482 | ||
1da177e4 | 483 | if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) |
513daadd | 484 | rq->errors |= ERROR_RESET; |
1da177e4 | 485 | |
513daadd | 486 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 487 | ++rq->errors; |
513daadd | 488 | return ide_do_reset(drive); |
1da177e4 | 489 | } |
513daadd SS |
490 | |
491 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
492 | drive->special.b.recalibrate = 1; | |
493 | ||
494 | ++rq->errors; | |
495 | ||
1da177e4 LT |
496 | return ide_stopped; |
497 | } | |
498 | ||
499 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
500 | { | |
501 | ide_hwif_t *hwif = drive->hwif; | |
502 | ||
503 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
504 | /* other bits are useless when BUSY */ | |
505 | rq->errors |= ERROR_RESET; | |
506 | } else { | |
507 | /* add decoding error stuff */ | |
508 | } | |
509 | ||
510 | if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) | |
511 | /* force an abort */ | |
512 | hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG); | |
513 | ||
514 | if (rq->errors >= ERROR_MAX) { | |
515 | ide_kill_rq(drive, rq); | |
516 | } else { | |
517 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
518 | ++rq->errors; | |
519 | return ide_do_reset(drive); | |
520 | } | |
521 | ++rq->errors; | |
522 | } | |
523 | ||
524 | return ide_stopped; | |
525 | } | |
526 | ||
527 | ide_startstop_t | |
528 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
529 | { | |
530 | if (drive->media == ide_disk) | |
531 | return ide_ata_error(drive, rq, stat, err); | |
532 | return ide_atapi_error(drive, rq, stat, err); | |
533 | } | |
534 | ||
535 | EXPORT_SYMBOL_GPL(__ide_error); | |
536 | ||
537 | /** | |
538 | * ide_error - handle an error on the IDE | |
539 | * @drive: drive the error occurred on | |
540 | * @msg: message to report | |
541 | * @stat: status bits | |
542 | * | |
543 | * ide_error() takes action based on the error returned by the drive. | |
544 | * For normal I/O that may well include retries. We deal with | |
545 | * both new-style (taskfile) and old style command handling here. | |
546 | * In the case of taskfile command handling there is work left to | |
547 | * do | |
548 | */ | |
549 | ||
550 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
551 | { | |
552 | struct request *rq; | |
553 | u8 err; | |
554 | ||
555 | err = ide_dump_status(drive, msg, stat); | |
556 | ||
557 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
558 | return ide_stopped; | |
559 | ||
560 | /* retry only "normal" I/O: */ | |
4aff5e23 | 561 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
562 | rq->errors = 1; |
563 | ide_end_drive_cmd(drive, stat, err); | |
564 | return ide_stopped; | |
565 | } | |
566 | ||
567 | if (rq->rq_disk) { | |
568 | ide_driver_t *drv; | |
569 | ||
570 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
571 | return drv->error(drive, rq, stat, err); | |
572 | } else | |
573 | return __ide_error(drive, rq, stat, err); | |
574 | } | |
575 | ||
576 | EXPORT_SYMBOL_GPL(ide_error); | |
577 | ||
578 | ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq) | |
579 | { | |
580 | if (drive->media != ide_disk) | |
581 | rq->errors |= ERROR_RESET; | |
582 | ||
583 | ide_kill_rq(drive, rq); | |
584 | ||
585 | return ide_stopped; | |
586 | } | |
587 | ||
588 | EXPORT_SYMBOL_GPL(__ide_abort); | |
589 | ||
590 | /** | |
338cec32 | 591 | * ide_abort - abort pending IDE operations |
1da177e4 LT |
592 | * @drive: drive the error occurred on |
593 | * @msg: message to report | |
594 | * | |
595 | * ide_abort kills and cleans up when we are about to do a | |
596 | * host initiated reset on active commands. Longer term we | |
597 | * want handlers to have sensible abort handling themselves | |
598 | * | |
599 | * This differs fundamentally from ide_error because in | |
600 | * this case the command is doing just fine when we | |
601 | * blow it away. | |
602 | */ | |
603 | ||
604 | ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg) | |
605 | { | |
606 | struct request *rq; | |
607 | ||
608 | if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL) | |
609 | return ide_stopped; | |
610 | ||
611 | /* retry only "normal" I/O: */ | |
4aff5e23 | 612 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
613 | rq->errors = 1; |
614 | ide_end_drive_cmd(drive, BUSY_STAT, 0); | |
615 | return ide_stopped; | |
616 | } | |
617 | ||
618 | if (rq->rq_disk) { | |
619 | ide_driver_t *drv; | |
620 | ||
621 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
622 | return drv->abort(drive, rq); | |
623 | } else | |
624 | return __ide_abort(drive, rq); | |
625 | } | |
626 | ||
1da177e4 LT |
627 | /** |
628 | * drive_cmd_intr - drive command completion interrupt | |
629 | * @drive: drive the completion interrupt occurred on | |
630 | * | |
631 | * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD. | |
338cec32 | 632 | * We do any necessary data reading and then wait for the drive to |
1da177e4 LT |
633 | * go non busy. At that point we may read the error data and complete |
634 | * the request | |
635 | */ | |
636 | ||
637 | static ide_startstop_t drive_cmd_intr (ide_drive_t *drive) | |
638 | { | |
639 | struct request *rq = HWGROUP(drive)->rq; | |
640 | ide_hwif_t *hwif = HWIF(drive); | |
18a056fe | 641 | u8 *args = (u8 *)rq->buffer, pio_in = (args && args[3]) ? 1 : 0, stat; |
1da177e4 | 642 | |
18a056fe | 643 | if (pio_in) { |
1da177e4 | 644 | u8 io_32bit = drive->io_32bit; |
18a056fe BZ |
645 | stat = hwif->INB(IDE_STATUS_REG); |
646 | if ((stat & DRQ_STAT) == 0) | |
647 | goto out; | |
1da177e4 LT |
648 | drive->io_32bit = 0; |
649 | hwif->ata_input_data(drive, &args[4], args[3] * SECTOR_WORDS); | |
650 | drive->io_32bit = io_32bit; | |
2624565c | 651 | stat = wait_drive_not_busy(drive); |
18a056fe BZ |
652 | } else { |
653 | local_irq_enable_in_hardirq(); | |
654 | stat = hwif->INB(IDE_STATUS_REG); | |
1da177e4 | 655 | } |
18a056fe | 656 | out: |
1da177e4 LT |
657 | if (!OK_STAT(stat, READY_STAT, BAD_STAT)) |
658 | return ide_error(drive, "drive_cmd", stat); | |
659 | /* calls ide_end_drive_cmd */ | |
660 | ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG)); | |
661 | return ide_stopped; | |
662 | } | |
663 | ||
57d7366b | 664 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 665 | { |
57d7366b BZ |
666 | tf->nsect = drive->sect; |
667 | tf->lbal = drive->sect; | |
668 | tf->lbam = drive->cyl; | |
669 | tf->lbah = drive->cyl >> 8; | |
670 | tf->device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA; | |
671 | tf->command = WIN_SPECIFY; | |
1da177e4 LT |
672 | } |
673 | ||
57d7366b | 674 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 675 | { |
57d7366b BZ |
676 | tf->nsect = drive->sect; |
677 | tf->command = WIN_RESTORE; | |
1da177e4 LT |
678 | } |
679 | ||
57d7366b | 680 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 681 | { |
57d7366b BZ |
682 | tf->nsect = drive->mult_req; |
683 | tf->command = WIN_SETMULT; | |
1da177e4 LT |
684 | } |
685 | ||
686 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
687 | { | |
688 | special_t *s = &drive->special; | |
689 | ide_task_t args; | |
690 | ||
691 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 692 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
693 | |
694 | if (s->b.set_geometry) { | |
695 | s->b.set_geometry = 0; | |
57d7366b | 696 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
697 | } else if (s->b.recalibrate) { |
698 | s->b.recalibrate = 0; | |
57d7366b | 699 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
700 | } else if (s->b.set_multmode) { |
701 | s->b.set_multmode = 0; | |
702 | if (drive->mult_req > drive->id->max_multsect) | |
703 | drive->mult_req = drive->id->max_multsect; | |
57d7366b | 704 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
705 | } else if (s->all) { |
706 | int special = s->all; | |
707 | s->all = 0; | |
708 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
709 | return ide_stopped; | |
710 | } | |
711 | ||
657cc1a8 | 712 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 713 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 714 | |
1da177e4 LT |
715 | do_rw_taskfile(drive, &args); |
716 | ||
717 | return ide_started; | |
718 | } | |
719 | ||
26bcb879 BZ |
720 | /* |
721 | * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away | |
722 | */ | |
723 | static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) | |
724 | { | |
725 | switch (req_pio) { | |
726 | case 202: | |
727 | case 201: | |
728 | case 200: | |
729 | case 102: | |
730 | case 101: | |
731 | case 100: | |
732 | return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; | |
733 | case 9: | |
734 | case 8: | |
735 | return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; | |
736 | case 7: | |
737 | case 6: | |
738 | return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; | |
739 | default: | |
740 | return 0; | |
741 | } | |
742 | } | |
743 | ||
1da177e4 LT |
744 | /** |
745 | * do_special - issue some special commands | |
746 | * @drive: drive the command is for | |
747 | * | |
748 | * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT | |
749 | * commands to a drive. It used to do much more, but has been scaled | |
750 | * back. | |
751 | */ | |
752 | ||
753 | static ide_startstop_t do_special (ide_drive_t *drive) | |
754 | { | |
755 | special_t *s = &drive->special; | |
756 | ||
757 | #ifdef DEBUG | |
758 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
759 | #endif | |
760 | if (s->b.set_tune) { | |
26bcb879 BZ |
761 | ide_hwif_t *hwif = drive->hwif; |
762 | u8 req_pio = drive->tune_req; | |
763 | ||
1da177e4 | 764 | s->b.set_tune = 0; |
26bcb879 BZ |
765 | |
766 | if (set_pio_mode_abuse(drive->hwif, req_pio)) { | |
d393aa03 BZ |
767 | |
768 | if (hwif->set_pio_mode == NULL) | |
769 | return ide_stopped; | |
770 | ||
771 | /* | |
772 | * take ide_lock for drive->[no_]unmask/[no_]io_32bit | |
773 | */ | |
774 | if (req_pio == 8 || req_pio == 9) { | |
775 | unsigned long flags; | |
776 | ||
777 | spin_lock_irqsave(&ide_lock, flags); | |
778 | hwif->set_pio_mode(drive, req_pio); | |
779 | spin_unlock_irqrestore(&ide_lock, flags); | |
780 | } else | |
26bcb879 | 781 | hwif->set_pio_mode(drive, req_pio); |
aedea591 BZ |
782 | } else { |
783 | int keep_dma = drive->using_dma; | |
784 | ||
26bcb879 BZ |
785 | ide_set_pio(drive, req_pio); |
786 | ||
aedea591 BZ |
787 | if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { |
788 | if (keep_dma) | |
4a546e04 | 789 | ide_dma_on(drive); |
aedea591 BZ |
790 | } |
791 | } | |
792 | ||
1da177e4 LT |
793 | return ide_stopped; |
794 | } else { | |
795 | if (drive->media == ide_disk) | |
796 | return ide_disk_special(drive); | |
797 | ||
798 | s->all = 0; | |
799 | drive->mult_req = 0; | |
800 | return ide_stopped; | |
801 | } | |
802 | } | |
803 | ||
804 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
805 | { | |
806 | ide_hwif_t *hwif = drive->hwif; | |
807 | struct scatterlist *sg = hwif->sg_table; | |
808 | ||
809 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
810 | return; | |
811 | ||
4aff5e23 | 812 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
813 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
814 | } else { | |
815 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
816 | hwif->sg_nents = 1; | |
817 | } | |
818 | } | |
819 | ||
820 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
821 | ||
822 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
823 | { | |
824 | ide_hwif_t *hwif = drive->hwif; | |
825 | ||
826 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
827 | hwif->cursg_ofs = 0; |
828 | hwif->cursg = NULL; | |
1da177e4 LT |
829 | } |
830 | ||
831 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
832 | ||
833 | /** | |
834 | * execute_drive_command - issue special drive command | |
338cec32 | 835 | * @drive: the drive to issue the command on |
1da177e4 LT |
836 | * @rq: the request structure holding the command |
837 | * | |
838 | * execute_drive_cmd() issues a special drive command, usually | |
839 | * initiated by ioctl() from the external hdparm program. The | |
840 | * command can be a drive command, drive task or taskfile | |
841 | * operation. Weirdly you can call it with NULL to wait for | |
842 | * all commands to finish. Don't do this as that is due to change | |
843 | */ | |
844 | ||
845 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
846 | struct request *rq) | |
847 | { | |
848 | ide_hwif_t *hwif = HWIF(drive); | |
21d535c9 | 849 | u8 *args = rq->buffer; |
807e35d6 BZ |
850 | ide_task_t ltask; |
851 | struct ide_taskfile *tf = <ask.tf; | |
21d535c9 | 852 | |
4aff5e23 | 853 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
21d535c9 | 854 | ide_task_t *task = rq->special; |
1da177e4 | 855 | |
21d535c9 | 856 | if (task == NULL) |
1da177e4 LT |
857 | goto done; |
858 | ||
21d535c9 | 859 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
860 | |
861 | switch (hwif->data_phase) { | |
862 | case TASKFILE_MULTI_OUT: | |
863 | case TASKFILE_OUT: | |
864 | case TASKFILE_MULTI_IN: | |
865 | case TASKFILE_IN: | |
866 | ide_init_sg_cmd(drive, rq); | |
867 | ide_map_sg(drive, rq); | |
868 | default: | |
869 | break; | |
870 | } | |
74095a91 | 871 | |
21d535c9 BZ |
872 | return do_rw_taskfile(drive, task); |
873 | } | |
874 | ||
875 | if (args == NULL) | |
876 | goto done; | |
877 | ||
807e35d6 | 878 | memset(<ask, 0, sizeof(ltask)); |
29ed2a5f | 879 | if (rq->cmd_type == REQ_TYPE_ATA_CMD) { |
1da177e4 | 880 | #ifdef DEBUG |
807e35d6 | 881 | printk("%s: DRIVE_CMD\n", drive->name); |
1da177e4 | 882 | #endif |
807e35d6 BZ |
883 | tf->feature = args[2]; |
884 | if (args[0] == WIN_SMART) { | |
885 | tf->nsect = args[3]; | |
886 | tf->lbal = args[1]; | |
887 | tf->lbam = 0x4f; | |
888 | tf->lbah = 0xc2; | |
889 | ltask.tf_flags = IDE_TFLAG_OUT_TF; | |
890 | } else { | |
891 | tf->nsect = args[1]; | |
892 | ltask.tf_flags = IDE_TFLAG_OUT_FEATURE | | |
893 | IDE_TFLAG_OUT_NSECT; | |
894 | } | |
1da177e4 | 895 | } |
807e35d6 BZ |
896 | tf->command = args[0]; |
897 | ide_tf_load(drive, <ask); | |
1f2564b8 | 898 | ide_execute_command(drive, args[0], &drive_cmd_intr, WAIT_WORSTCASE, NULL); |
21d535c9 BZ |
899 | return ide_started; |
900 | ||
1da177e4 LT |
901 | done: |
902 | /* | |
903 | * NULL is actually a valid way of waiting for | |
904 | * all current requests to be flushed from the queue. | |
905 | */ | |
906 | #ifdef DEBUG | |
907 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
908 | #endif | |
909 | ide_end_drive_cmd(drive, | |
910 | hwif->INB(IDE_STATUS_REG), | |
911 | hwif->INB(IDE_ERROR_REG)); | |
912 | return ide_stopped; | |
913 | } | |
914 | ||
ad3cadda JA |
915 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
916 | { | |
c00895ab | 917 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
918 | |
919 | if (blk_pm_suspend_request(rq) && | |
920 | pm->pm_step == ide_pm_state_start_suspend) | |
921 | /* Mark drive blocked when starting the suspend sequence. */ | |
922 | drive->blocked = 1; | |
923 | else if (blk_pm_resume_request(rq) && | |
924 | pm->pm_step == ide_pm_state_start_resume) { | |
925 | /* | |
926 | * The first thing we do on wakeup is to wait for BSY bit to | |
927 | * go away (with a looong timeout) as a drive on this hwif may | |
928 | * just be POSTing itself. | |
929 | * We do that before even selecting as the "other" device on | |
930 | * the bus may be broken enough to walk on our toes at this | |
931 | * point. | |
932 | */ | |
933 | int rc; | |
934 | #ifdef DEBUG_PM | |
935 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
936 | #endif | |
937 | rc = ide_wait_not_busy(HWIF(drive), 35000); | |
938 | if (rc) | |
939 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
940 | SELECT_DRIVE(drive); | |
81ca6919 | 941 | ide_set_irq(drive, 1); |
178184b6 | 942 | rc = ide_wait_not_busy(HWIF(drive), 100000); |
ad3cadda JA |
943 | if (rc) |
944 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
945 | } | |
946 | } | |
947 | ||
1da177e4 LT |
948 | /** |
949 | * start_request - start of I/O and command issuing for IDE | |
950 | * | |
951 | * start_request() initiates handling of a new I/O request. It | |
952 | * accepts commands and I/O (read/write) requests. It also does | |
953 | * the final remapping for weird stuff like EZDrive. Once | |
954 | * device mapper can work sector level the EZDrive stuff can go away | |
955 | * | |
956 | * FIXME: this function needs a rename | |
957 | */ | |
958 | ||
959 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
960 | { | |
961 | ide_startstop_t startstop; | |
962 | sector_t block; | |
963 | ||
4aff5e23 | 964 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
965 | |
966 | #ifdef DEBUG | |
967 | printk("%s: start_request: current=0x%08lx\n", | |
968 | HWIF(drive)->name, (unsigned long) rq); | |
969 | #endif | |
970 | ||
971 | /* bail early if we've exceeded max_failures */ | |
972 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 973 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
974 | goto kill_rq; |
975 | } | |
976 | ||
977 | block = rq->sector; | |
978 | if (blk_fs_request(rq) && | |
979 | (drive->media == ide_disk || drive->media == ide_floppy)) { | |
980 | block += drive->sect0; | |
981 | } | |
982 | /* Yecch - this will shift the entire interval, | |
983 | possibly killing some innocent following sector */ | |
984 | if (block == 0 && drive->remap_0_to_1 == 1) | |
985 | block = 1; /* redirect MBR access to EZ-Drive partn table */ | |
986 | ||
ad3cadda JA |
987 | if (blk_pm_request(rq)) |
988 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
989 | |
990 | SELECT_DRIVE(drive); | |
991 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) { | |
992 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); | |
993 | return startstop; | |
994 | } | |
995 | if (!drive->special.all) { | |
996 | ide_driver_t *drv; | |
997 | ||
513daadd SS |
998 | /* |
999 | * We reset the drive so we need to issue a SETFEATURES. | |
1000 | * Do it _after_ do_special() restored device parameters. | |
1001 | */ | |
1002 | if (drive->current_speed == 0xff) | |
1003 | ide_config_drive_speed(drive, drive->desired_speed); | |
1004 | ||
4aff5e23 | 1005 | if (rq->cmd_type == REQ_TYPE_ATA_CMD || |
4aff5e23 | 1006 | rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
1007 | return execute_drive_cmd(drive, rq); |
1008 | else if (blk_pm_request(rq)) { | |
c00895ab | 1009 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
1010 | #ifdef DEBUG_PM |
1011 | printk("%s: start_power_step(step: %d)\n", | |
1012 | drive->name, rq->pm->pm_step); | |
1013 | #endif | |
1014 | startstop = ide_start_power_step(drive, rq); | |
1015 | if (startstop == ide_stopped && | |
ad3cadda | 1016 | pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
1017 | ide_complete_pm_request(drive, rq); |
1018 | return startstop; | |
1019 | } | |
1020 | ||
1021 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
1022 | return drv->do_request(drive, rq, block); | |
1023 | } | |
1024 | return do_special(drive); | |
1025 | kill_rq: | |
1026 | ide_kill_rq(drive, rq); | |
1027 | return ide_stopped; | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * ide_stall_queue - pause an IDE device | |
1032 | * @drive: drive to stall | |
1033 | * @timeout: time to stall for (jiffies) | |
1034 | * | |
1035 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
1036 | * to the hwgroup by sleeping for timeout jiffies. | |
1037 | */ | |
1038 | ||
1039 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
1040 | { | |
1041 | if (timeout > WAIT_WORSTCASE) | |
1042 | timeout = WAIT_WORSTCASE; | |
1043 | drive->sleep = timeout + jiffies; | |
1044 | drive->sleeping = 1; | |
1045 | } | |
1046 | ||
1047 | EXPORT_SYMBOL(ide_stall_queue); | |
1048 | ||
1049 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
1050 | ||
1051 | /** | |
1052 | * choose_drive - select a drive to service | |
1053 | * @hwgroup: hardware group to select on | |
1054 | * | |
1055 | * choose_drive() selects the next drive which will be serviced. | |
1056 | * This is necessary because the IDE layer can't issue commands | |
1057 | * to both drives on the same cable, unlike SCSI. | |
1058 | */ | |
1059 | ||
1060 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
1061 | { | |
1062 | ide_drive_t *drive, *best; | |
1063 | ||
1064 | repeat: | |
1065 | best = NULL; | |
1066 | drive = hwgroup->drive; | |
1067 | ||
1068 | /* | |
1069 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
1070 | * though that is 3 requests, it must be seen as a single transaction. | |
1071 | * we must not preempt this drive until that is complete | |
1072 | */ | |
1073 | if (blk_queue_flushing(drive->queue)) { | |
1074 | /* | |
1075 | * small race where queue could get replugged during | |
1076 | * the 3-request flush cycle, just yank the plug since | |
1077 | * we want it to finish asap | |
1078 | */ | |
1079 | blk_remove_plug(drive->queue); | |
1080 | return drive; | |
1081 | } | |
1082 | ||
1083 | do { | |
1084 | if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep)) | |
1085 | && !elv_queue_empty(drive->queue)) { | |
1086 | if (!best | |
1087 | || (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep))) | |
1088 | || (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best)))) | |
1089 | { | |
1090 | if (!blk_queue_plugged(drive->queue)) | |
1091 | best = drive; | |
1092 | } | |
1093 | } | |
1094 | } while ((drive = drive->next) != hwgroup->drive); | |
1095 | if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1096 | long t = (signed long)(WAKEUP(best) - jiffies); | |
1097 | if (t >= WAIT_MIN_SLEEP) { | |
1098 | /* | |
1099 | * We *may* have some time to spare, but first let's see if | |
1100 | * someone can potentially benefit from our nice mood today.. | |
1101 | */ | |
1102 | drive = best->next; | |
1103 | do { | |
1104 | if (!drive->sleeping | |
1105 | && time_before(jiffies - best->service_time, WAKEUP(drive)) | |
1106 | && time_before(WAKEUP(drive), jiffies + t)) | |
1107 | { | |
1108 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
1109 | goto repeat; | |
1110 | } | |
1111 | } while ((drive = drive->next) != best); | |
1112 | } | |
1113 | } | |
1114 | return best; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * Issue a new request to a drive from hwgroup | |
1119 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
1120 | * | |
1121 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
1122 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
1123 | * may have both interfaces in a single hwgroup to "serialize" access. | |
1124 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
1125 | * together into one hwgroup for serialized access. | |
1126 | * | |
1127 | * Note also that several hwgroups can end up sharing a single IRQ, | |
1128 | * possibly along with many other devices. This is especially common in | |
1129 | * PCI-based systems with off-board IDE controller cards. | |
1130 | * | |
1131 | * The IDE driver uses the single global ide_lock spinlock to protect | |
1132 | * access to the request queues, and to protect the hwgroup->busy flag. | |
1133 | * | |
1134 | * The first thread into the driver for a particular hwgroup sets the | |
1135 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
1136 | * and then initiates processing of the top request from the request queue. | |
1137 | * | |
1138 | * Other threads attempting entry notice the busy setting, and will simply | |
1139 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
1140 | * remains set even when the driver is merely awaiting the next interrupt. | |
1141 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
1142 | * | |
1143 | * When processing of a request completes, the completing thread or IRQ-handler | |
1144 | * will start the next request from the queue. If no more work remains, | |
1145 | * the driver will clear the hwgroup->busy flag and exit. | |
1146 | * | |
1147 | * The ide_lock (spinlock) is used to protect all access to the | |
1148 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
1149 | * the driver. This makes the driver much more friendlier to shared IRQs | |
1150 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
1151 | */ | |
1152 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
1153 | { | |
1154 | ide_drive_t *drive; | |
1155 | ide_hwif_t *hwif; | |
1156 | struct request *rq; | |
1157 | ide_startstop_t startstop; | |
867f8b4e | 1158 | int loops = 0; |
1da177e4 LT |
1159 | |
1160 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
1161 | ide_get_lock(ide_intr, hwgroup); | |
1162 | ||
1163 | /* caller must own ide_lock */ | |
1164 | BUG_ON(!irqs_disabled()); | |
1165 | ||
1166 | while (!hwgroup->busy) { | |
1167 | hwgroup->busy = 1; | |
1168 | drive = choose_drive(hwgroup); | |
1169 | if (drive == NULL) { | |
1170 | int sleeping = 0; | |
1171 | unsigned long sleep = 0; /* shut up, gcc */ | |
1172 | hwgroup->rq = NULL; | |
1173 | drive = hwgroup->drive; | |
1174 | do { | |
1175 | if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) { | |
1176 | sleeping = 1; | |
1177 | sleep = drive->sleep; | |
1178 | } | |
1179 | } while ((drive = drive->next) != hwgroup->drive); | |
1180 | if (sleeping) { | |
1181 | /* | |
1182 | * Take a short snooze, and then wake up this hwgroup again. | |
1183 | * This gives other hwgroups on the same a chance to | |
1184 | * play fairly with us, just in case there are big differences | |
1185 | * in relative throughputs.. don't want to hog the cpu too much. | |
1186 | */ | |
1187 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1188 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1189 | #if 1 | |
1190 | if (timer_pending(&hwgroup->timer)) | |
1191 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1192 | #endif | |
1193 | /* so that ide_timer_expiry knows what to do */ | |
1194 | hwgroup->sleeping = 1; | |
23450319 | 1195 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1196 | mod_timer(&hwgroup->timer, sleep); |
1197 | /* we purposely leave hwgroup->busy==1 | |
1198 | * while sleeping */ | |
1199 | } else { | |
1200 | /* Ugly, but how can we sleep for the lock | |
1201 | * otherwise? perhaps from tq_disk? | |
1202 | */ | |
1203 | ||
1204 | /* for atari only */ | |
1205 | ide_release_lock(); | |
1206 | hwgroup->busy = 0; | |
1207 | } | |
1208 | ||
1209 | /* no more work for this hwgroup (for now) */ | |
1210 | return; | |
1211 | } | |
867f8b4e | 1212 | again: |
1da177e4 | 1213 | hwif = HWIF(drive); |
81ca6919 | 1214 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1215 | /* |
1216 | * set nIEN for previous hwif, drives in the | |
1217 | * quirk_list may not like intr setups/cleanups | |
1218 | */ | |
1219 | if (drive->quirk_list != 1) | |
81ca6919 | 1220 | ide_set_irq(drive, 0); |
1da177e4 LT |
1221 | } |
1222 | hwgroup->hwif = hwif; | |
1223 | hwgroup->drive = drive; | |
1224 | drive->sleeping = 0; | |
1225 | drive->service_start = jiffies; | |
1226 | ||
1227 | if (blk_queue_plugged(drive->queue)) { | |
1228 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * we know that the queue isn't empty, but this can happen | |
1234 | * if the q->prep_rq_fn() decides to kill a request | |
1235 | */ | |
1236 | rq = elv_next_request(drive->queue); | |
1237 | if (!rq) { | |
1238 | hwgroup->busy = 0; | |
1239 | break; | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Sanity: don't accept a request that isn't a PM request | |
1244 | * if we are currently power managed. This is very important as | |
1245 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1246 | * above to return us whatever is in the queue. Since we call | |
1247 | * ide_do_request() ourselves, we end up taking requests while | |
1248 | * the queue is blocked... | |
1249 | * | |
1250 | * We let requests forced at head of queue with ide-preempt | |
1251 | * though. I hope that doesn't happen too much, hopefully not | |
1252 | * unless the subdriver triggers such a thing in its own PM | |
1253 | * state machine. | |
867f8b4e BH |
1254 | * |
1255 | * We count how many times we loop here to make sure we service | |
1256 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1257 | */ |
4aff5e23 | 1258 | if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) { |
867f8b4e BH |
1259 | drive = drive->next ? drive->next : hwgroup->drive; |
1260 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1261 | goto again; | |
1da177e4 LT |
1262 | /* We clear busy, there should be no pending ATA command at this point. */ |
1263 | hwgroup->busy = 0; | |
1264 | break; | |
1265 | } | |
1266 | ||
1267 | hwgroup->rq = rq; | |
1268 | ||
1269 | /* | |
1270 | * Some systems have trouble with IDE IRQs arriving while | |
1271 | * the driver is still setting things up. So, here we disable | |
1272 | * the IRQ used by this interface while the request is being started. | |
1273 | * This may look bad at first, but pretty much the same thing | |
1274 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1275 | * -- the kernel masks the IRQ while it is being handled. | |
1276 | */ | |
1277 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1278 | disable_irq_nosync(hwif->irq); | |
1279 | spin_unlock(&ide_lock); | |
366c7f55 | 1280 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1281 | /* allow other IRQs while we start this request */ |
1282 | startstop = start_request(drive, rq); | |
1283 | spin_lock_irq(&ide_lock); | |
1284 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1285 | enable_irq(hwif->irq); | |
1286 | if (startstop == ide_stopped) | |
1287 | hwgroup->busy = 0; | |
1288 | } | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Passes the stuff to ide_do_request | |
1293 | */ | |
165125e1 | 1294 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1295 | { |
1296 | ide_drive_t *drive = q->queuedata; | |
1297 | ||
1298 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1303 | * retry the current request in pio mode instead of risking tossing it | |
1304 | * all away | |
1305 | */ | |
1306 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1307 | { | |
1308 | ide_hwif_t *hwif = HWIF(drive); | |
1309 | struct request *rq; | |
1310 | ide_startstop_t ret = ide_stopped; | |
1311 | ||
1312 | /* | |
1313 | * end current dma transaction | |
1314 | */ | |
1315 | ||
1316 | if (error < 0) { | |
1317 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
1318 | (void)HWIF(drive)->ide_dma_end(drive); | |
1319 | ret = ide_error(drive, "dma timeout error", | |
1320 | hwif->INB(IDE_STATUS_REG)); | |
1321 | } else { | |
1322 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
c283f5db | 1323 | hwif->dma_timeout(drive); |
1da177e4 LT |
1324 | } |
1325 | ||
1326 | /* | |
1327 | * disable dma for now, but remember that we did so because of | |
1328 | * a timeout -- we'll reenable after we finish this next request | |
1329 | * (or rather the first chunk of it) in pio. | |
1330 | */ | |
1331 | drive->retry_pio++; | |
1332 | drive->state = DMA_PIO_RETRY; | |
4a546e04 | 1333 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1334 | |
1335 | /* | |
1336 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1337 | * make sure request is sane | |
1338 | */ | |
1339 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1340 | |
1341 | if (!rq) | |
1342 | goto out; | |
1343 | ||
1da177e4 LT |
1344 | HWGROUP(drive)->rq = NULL; |
1345 | ||
1346 | rq->errors = 0; | |
1347 | ||
1348 | if (!rq->bio) | |
1349 | goto out; | |
1350 | ||
1351 | rq->sector = rq->bio->bi_sector; | |
1352 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1353 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1354 | rq->buffer = bio_data(rq->bio); | |
1355 | out: | |
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | /** | |
1360 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1361 | * @data: timer callback magic (hwgroup) | |
1362 | * | |
1363 | * An IDE command has timed out before the expected drive return | |
1364 | * occurred. At this point we attempt to clean up the current | |
1365 | * mess. If the current handler includes an expiry handler then | |
1366 | * we invoke the expiry handler, and providing it is happy the | |
1367 | * work is done. If that fails we apply generic recovery rules | |
1368 | * invoking the handler and checking the drive DMA status. We | |
1369 | * have an excessively incestuous relationship with the DMA | |
1370 | * logic that wants cleaning up. | |
1371 | */ | |
1372 | ||
1373 | void ide_timer_expiry (unsigned long data) | |
1374 | { | |
1375 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1376 | ide_handler_t *handler; | |
1377 | ide_expiry_t *expiry; | |
1378 | unsigned long flags; | |
1379 | unsigned long wait = -1; | |
1380 | ||
1381 | spin_lock_irqsave(&ide_lock, flags); | |
1382 | ||
23450319 SS |
1383 | if (((handler = hwgroup->handler) == NULL) || |
1384 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1385 | /* |
1386 | * Either a marginal timeout occurred | |
1387 | * (got the interrupt just as timer expired), | |
1388 | * or we were "sleeping" to give other devices a chance. | |
1389 | * Either way, we don't really want to complain about anything. | |
1390 | */ | |
1391 | if (hwgroup->sleeping) { | |
1392 | hwgroup->sleeping = 0; | |
1393 | hwgroup->busy = 0; | |
1394 | } | |
1395 | } else { | |
1396 | ide_drive_t *drive = hwgroup->drive; | |
1397 | if (!drive) { | |
1398 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1399 | hwgroup->handler = NULL; | |
1400 | } else { | |
1401 | ide_hwif_t *hwif; | |
1402 | ide_startstop_t startstop = ide_stopped; | |
1403 | if (!hwgroup->busy) { | |
1404 | hwgroup->busy = 1; /* paranoia */ | |
1405 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1406 | } | |
1407 | if ((expiry = hwgroup->expiry) != NULL) { | |
1408 | /* continue */ | |
1409 | if ((wait = expiry(drive)) > 0) { | |
1410 | /* reset timer */ | |
1411 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1412 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1413 | add_timer(&hwgroup->timer); |
1414 | spin_unlock_irqrestore(&ide_lock, flags); | |
1415 | return; | |
1416 | } | |
1417 | } | |
1418 | hwgroup->handler = NULL; | |
1419 | /* | |
1420 | * We need to simulate a real interrupt when invoking | |
1421 | * the handler() function, which means we need to | |
1422 | * globally mask the specific IRQ: | |
1423 | */ | |
1424 | spin_unlock(&ide_lock); | |
1425 | hwif = HWIF(drive); | |
1da177e4 LT |
1426 | /* disable_irq_nosync ?? */ |
1427 | disable_irq(hwif->irq); | |
1da177e4 LT |
1428 | /* local CPU only, |
1429 | * as if we were handling an interrupt */ | |
1430 | local_irq_disable(); | |
1431 | if (hwgroup->polling) { | |
1432 | startstop = handler(drive); | |
1433 | } else if (drive_is_ready(drive)) { | |
1434 | if (drive->waiting_for_dma) | |
841d2a9b | 1435 | hwgroup->hwif->dma_lost_irq(drive); |
1da177e4 LT |
1436 | (void)ide_ack_intr(hwif); |
1437 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1438 | startstop = handler(drive); | |
1439 | } else { | |
1440 | if (drive->waiting_for_dma) { | |
1441 | startstop = ide_dma_timeout_retry(drive, wait); | |
1442 | } else | |
1443 | startstop = | |
1444 | ide_error(drive, "irq timeout", hwif->INB(IDE_STATUS_REG)); | |
1445 | } | |
1446 | drive->service_time = jiffies - drive->service_start; | |
1447 | spin_lock_irq(&ide_lock); | |
1448 | enable_irq(hwif->irq); | |
1449 | if (startstop == ide_stopped) | |
1450 | hwgroup->busy = 0; | |
1451 | } | |
1452 | } | |
1453 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1454 | spin_unlock_irqrestore(&ide_lock, flags); | |
1455 | } | |
1456 | ||
1457 | /** | |
1458 | * unexpected_intr - handle an unexpected IDE interrupt | |
1459 | * @irq: interrupt line | |
1460 | * @hwgroup: hwgroup being processed | |
1461 | * | |
1462 | * There's nothing really useful we can do with an unexpected interrupt, | |
1463 | * other than reading the status register (to clear it), and logging it. | |
1464 | * There should be no way that an irq can happen before we're ready for it, | |
1465 | * so we needn't worry much about losing an "important" interrupt here. | |
1466 | * | |
1467 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1468 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1469 | * looks "good", we just ignore the interrupt completely. | |
1470 | * | |
1471 | * This routine assumes __cli() is in effect when called. | |
1472 | * | |
1473 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1474 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1475 | * we could screw up by interfering with a new request being set up for | |
1476 | * irq15. | |
1477 | * | |
1478 | * In reality, this is a non-issue. The new command is not sent unless | |
1479 | * the drive is ready to accept one, in which case we know the drive is | |
1480 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1481 | * before completing the issuance of any new drive command, so we will not | |
1482 | * be accidentally invoked as a result of any valid command completion | |
1483 | * interrupt. | |
1484 | * | |
1485 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1486 | * is doing the current command, but we don't know which hwif burped | |
1487 | * mysteriously. | |
1488 | */ | |
1489 | ||
1490 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1491 | { | |
1492 | u8 stat; | |
1493 | ide_hwif_t *hwif = hwgroup->hwif; | |
1494 | ||
1495 | /* | |
1496 | * handle the unexpected interrupt | |
1497 | */ | |
1498 | do { | |
1499 | if (hwif->irq == irq) { | |
1500 | stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); | |
1501 | if (!OK_STAT(stat, READY_STAT, BAD_STAT)) { | |
1502 | /* Try to not flood the console with msgs */ | |
1503 | static unsigned long last_msgtime, count; | |
1504 | ++count; | |
1505 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1506 | last_msgtime = jiffies; | |
1507 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1508 | "status=0x%02x, count=%ld\n", | |
1509 | hwif->name, | |
1510 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1511 | } | |
1512 | } | |
1513 | } | |
1514 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1515 | } | |
1516 | ||
1517 | /** | |
1518 | * ide_intr - default IDE interrupt handler | |
1519 | * @irq: interrupt number | |
1520 | * @dev_id: hwif group | |
1521 | * @regs: unused weirdness from the kernel irq layer | |
1522 | * | |
1523 | * This is the default IRQ handler for the IDE layer. You should | |
1524 | * not need to override it. If you do be aware it is subtle in | |
1525 | * places | |
1526 | * | |
1527 | * hwgroup->hwif is the interface in the group currently performing | |
1528 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1529 | * the IRQ handler to call. As we issue a command the handlers | |
1530 | * step through multiple states, reassigning the handler to the | |
1531 | * next step in the process. Unlike a smart SCSI controller IDE | |
1532 | * expects the main processor to sequence the various transfer | |
1533 | * stages. We also manage a poll timer to catch up with most | |
1534 | * timeout situations. There are still a few where the handlers | |
1535 | * don't ever decide to give up. | |
1536 | * | |
1537 | * The handler eventually returns ide_stopped to indicate the | |
1538 | * request completed. At this point we issue the next request | |
1539 | * on the hwgroup and the process begins again. | |
1540 | */ | |
1541 | ||
7d12e780 | 1542 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1543 | { |
1544 | unsigned long flags; | |
1545 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1546 | ide_hwif_t *hwif; | |
1547 | ide_drive_t *drive; | |
1548 | ide_handler_t *handler; | |
1549 | ide_startstop_t startstop; | |
1550 | ||
1551 | spin_lock_irqsave(&ide_lock, flags); | |
1552 | hwif = hwgroup->hwif; | |
1553 | ||
1554 | if (!ide_ack_intr(hwif)) { | |
1555 | spin_unlock_irqrestore(&ide_lock, flags); | |
1556 | return IRQ_NONE; | |
1557 | } | |
1558 | ||
1559 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1560 | /* | |
1561 | * Not expecting an interrupt from this drive. | |
1562 | * That means this could be: | |
1563 | * (1) an interrupt from another PCI device | |
1564 | * sharing the same PCI INT# as us. | |
1565 | * or (2) a drive just entered sleep or standby mode, | |
1566 | * and is interrupting to let us know. | |
1567 | * or (3) a spurious interrupt of unknown origin. | |
1568 | * | |
1569 | * For PCI, we cannot tell the difference, | |
1570 | * so in that case we just ignore it and hope it goes away. | |
1571 | * | |
1572 | * FIXME: unexpected_intr should be hwif-> then we can | |
1573 | * remove all the ifdef PCI crap | |
1574 | */ | |
1575 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1576 | if (hwif->pci_dev && !hwif->pci_dev->vendor) | |
1577 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | |
1578 | { | |
1579 | /* | |
1580 | * Probably not a shared PCI interrupt, | |
1581 | * so we can safely try to do something about it: | |
1582 | */ | |
1583 | unexpected_intr(irq, hwgroup); | |
1584 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1585 | } else { | |
1586 | /* | |
1587 | * Whack the status register, just in case | |
1588 | * we have a leftover pending IRQ. | |
1589 | */ | |
1590 | (void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); | |
1591 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | |
1592 | } | |
1593 | spin_unlock_irqrestore(&ide_lock, flags); | |
1594 | return IRQ_NONE; | |
1595 | } | |
1596 | drive = hwgroup->drive; | |
1597 | if (!drive) { | |
1598 | /* | |
1599 | * This should NEVER happen, and there isn't much | |
1600 | * we could do about it here. | |
1601 | * | |
1602 | * [Note - this can occur if the drive is hot unplugged] | |
1603 | */ | |
1604 | spin_unlock_irqrestore(&ide_lock, flags); | |
1605 | return IRQ_HANDLED; | |
1606 | } | |
1607 | if (!drive_is_ready(drive)) { | |
1608 | /* | |
1609 | * This happens regularly when we share a PCI IRQ with | |
1610 | * another device. Unfortunately, it can also happen | |
1611 | * with some buggy drives that trigger the IRQ before | |
1612 | * their status register is up to date. Hopefully we have | |
1613 | * enough advance overhead that the latter isn't a problem. | |
1614 | */ | |
1615 | spin_unlock_irqrestore(&ide_lock, flags); | |
1616 | return IRQ_NONE; | |
1617 | } | |
1618 | if (!hwgroup->busy) { | |
1619 | hwgroup->busy = 1; /* paranoia */ | |
1620 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1621 | } | |
1622 | hwgroup->handler = NULL; | |
23450319 | 1623 | hwgroup->req_gen++; |
1da177e4 LT |
1624 | del_timer(&hwgroup->timer); |
1625 | spin_unlock(&ide_lock); | |
1626 | ||
f0dd8712 AL |
1627 | /* Some controllers might set DMA INTR no matter DMA or PIO; |
1628 | * bmdma status might need to be cleared even for | |
1629 | * PIO interrupts to prevent spurious/lost irq. | |
1630 | */ | |
1631 | if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma)) | |
1632 | /* ide_dma_end() needs bmdma status for error checking. | |
1633 | * So, skip clearing bmdma status here and leave it | |
1634 | * to ide_dma_end() if this is dma interrupt. | |
1635 | */ | |
1636 | hwif->ide_dma_clear_irq(drive); | |
1637 | ||
1da177e4 | 1638 | if (drive->unmask) |
366c7f55 | 1639 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1640 | /* service this interrupt, may set handler for next interrupt */ |
1641 | startstop = handler(drive); | |
1642 | spin_lock_irq(&ide_lock); | |
1643 | ||
1644 | /* | |
1645 | * Note that handler() may have set things up for another | |
1646 | * interrupt to occur soon, but it cannot happen until | |
1647 | * we exit from this routine, because it will be the | |
1648 | * same irq as is currently being serviced here, and Linux | |
1649 | * won't allow another of the same (on any CPU) until we return. | |
1650 | */ | |
1651 | drive->service_time = jiffies - drive->service_start; | |
1652 | if (startstop == ide_stopped) { | |
1653 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1654 | hwgroup->busy = 0; | |
1655 | ide_do_request(hwgroup, hwif->irq); | |
1656 | } else { | |
1657 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1658 | "on exit\n", drive->name); | |
1659 | } | |
1660 | } | |
1661 | spin_unlock_irqrestore(&ide_lock, flags); | |
1662 | return IRQ_HANDLED; | |
1663 | } | |
1664 | ||
1665 | /** | |
1666 | * ide_init_drive_cmd - initialize a drive command request | |
1667 | * @rq: request object | |
1668 | * | |
1669 | * Initialize a request before we fill it in and send it down to | |
1670 | * ide_do_drive_cmd. Commands must be set up by this function. Right | |
1671 | * now it doesn't do a lot, but if that changes abusers will have a | |
d6e05edc | 1672 | * nasty surprise. |
1da177e4 LT |
1673 | */ |
1674 | ||
1675 | void ide_init_drive_cmd (struct request *rq) | |
1676 | { | |
1677 | memset(rq, 0, sizeof(*rq)); | |
1da177e4 LT |
1678 | rq->ref_count = 1; |
1679 | } | |
1680 | ||
1681 | EXPORT_SYMBOL(ide_init_drive_cmd); | |
1682 | ||
1683 | /** | |
1684 | * ide_do_drive_cmd - issue IDE special command | |
1685 | * @drive: device to issue command | |
1686 | * @rq: request to issue | |
1687 | * @action: action for processing | |
1688 | * | |
1689 | * This function issues a special IDE device request | |
1690 | * onto the request queue. | |
1691 | * | |
1692 | * If action is ide_wait, then the rq is queued at the end of the | |
1693 | * request queue, and the function sleeps until it has been processed. | |
1694 | * This is for use when invoked from an ioctl handler. | |
1695 | * | |
1696 | * If action is ide_preempt, then the rq is queued at the head of | |
1697 | * the request queue, displacing the currently-being-processed | |
1698 | * request and this function returns immediately without waiting | |
1699 | * for the new rq to be completed. This is VERY DANGEROUS, and is | |
1700 | * intended for careful use by the ATAPI tape/cdrom driver code. | |
1701 | * | |
1da177e4 LT |
1702 | * If action is ide_end, then the rq is queued at the end of the |
1703 | * request queue, and the function returns immediately without waiting | |
1704 | * for the new rq to be completed. This is again intended for careful | |
1705 | * use by the ATAPI tape/cdrom driver code. | |
1706 | */ | |
1707 | ||
1708 | int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action) | |
1709 | { | |
1710 | unsigned long flags; | |
1711 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
60be6b9a | 1712 | DECLARE_COMPLETION_ONSTACK(wait); |
1da177e4 LT |
1713 | int where = ELEVATOR_INSERT_BACK, err; |
1714 | int must_wait = (action == ide_wait || action == ide_head_wait); | |
1715 | ||
1716 | rq->errors = 0; | |
1da177e4 LT |
1717 | |
1718 | /* | |
1719 | * we need to hold an extra reference to request for safe inspection | |
1720 | * after completion | |
1721 | */ | |
1722 | if (must_wait) { | |
1723 | rq->ref_count++; | |
c00895ab | 1724 | rq->end_io_data = &wait; |
1da177e4 LT |
1725 | rq->end_io = blk_end_sync_rq; |
1726 | } | |
1727 | ||
1728 | spin_lock_irqsave(&ide_lock, flags); | |
1729 | if (action == ide_preempt) | |
1730 | hwgroup->rq = NULL; | |
1731 | if (action == ide_preempt || action == ide_head_wait) { | |
1732 | where = ELEVATOR_INSERT_FRONT; | |
4aff5e23 | 1733 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
1734 | } |
1735 | __elv_add_request(drive->queue, rq, where, 0); | |
1736 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1737 | spin_unlock_irqrestore(&ide_lock, flags); | |
1738 | ||
1739 | err = 0; | |
1740 | if (must_wait) { | |
1741 | wait_for_completion(&wait); | |
1da177e4 LT |
1742 | if (rq->errors) |
1743 | err = -EIO; | |
1744 | ||
1745 | blk_put_request(rq); | |
1746 | } | |
1747 | ||
1748 | return err; | |
1749 | } | |
1750 | ||
1751 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1752 | |
1753 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1754 | { | |
1755 | ide_task_t task; | |
1756 | ||
1757 | memset(&task, 0, sizeof(task)); | |
1758 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1759 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1760 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1761 | task.tf.lbam = bcount & 0xff; | |
1762 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1763 | ||
1764 | ide_tf_load(drive, &task); | |
1765 | } | |
1766 | ||
1767 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); |