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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 | */ | |
15ce926a | 221 | if (drive->hwif->dma_host_set == 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 | ||
c2b57cdc BZ |
298 | void ide_tf_read(ide_drive_t *drive, ide_task_t *task) |
299 | { | |
300 | ide_hwif_t *hwif = drive->hwif; | |
301 | struct ide_taskfile *tf = &task->tf; | |
302 | ||
303 | if (task->tf_flags & IDE_TFLAG_IN_DATA) { | |
304 | u16 data = hwif->INW(IDE_DATA_REG); | |
305 | ||
306 | tf->data = data & 0xff; | |
307 | tf->hob_data = (data >> 8) & 0xff; | |
308 | } | |
309 | ||
310 | /* be sure we're looking at the low order bits */ | |
311 | hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG); | |
312 | ||
313 | if (task->tf_flags & IDE_TFLAG_IN_NSECT) | |
314 | tf->nsect = hwif->INB(IDE_NSECTOR_REG); | |
315 | if (task->tf_flags & IDE_TFLAG_IN_LBAL) | |
316 | tf->lbal = hwif->INB(IDE_SECTOR_REG); | |
317 | if (task->tf_flags & IDE_TFLAG_IN_LBAM) | |
318 | tf->lbam = hwif->INB(IDE_LCYL_REG); | |
319 | if (task->tf_flags & IDE_TFLAG_IN_LBAH) | |
320 | tf->lbah = hwif->INB(IDE_HCYL_REG); | |
321 | if (task->tf_flags & IDE_TFLAG_IN_DEVICE) | |
322 | tf->device = hwif->INB(IDE_SELECT_REG); | |
323 | ||
324 | if (task->tf_flags & IDE_TFLAG_LBA48) { | |
325 | hwif->OUTB(drive->ctl | 0x80, IDE_CONTROL_REG); | |
326 | ||
327 | if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) | |
328 | tf->hob_feature = hwif->INB(IDE_FEATURE_REG); | |
329 | if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) | |
330 | tf->hob_nsect = hwif->INB(IDE_NSECTOR_REG); | |
331 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) | |
332 | tf->hob_lbal = hwif->INB(IDE_SECTOR_REG); | |
333 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) | |
334 | tf->hob_lbam = hwif->INB(IDE_LCYL_REG); | |
335 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) | |
336 | tf->hob_lbah = hwif->INB(IDE_HCYL_REG); | |
337 | } | |
338 | } | |
339 | ||
1da177e4 LT |
340 | /** |
341 | * ide_end_drive_cmd - end an explicit drive command | |
342 | * @drive: command | |
343 | * @stat: status bits | |
344 | * @err: error bits | |
345 | * | |
346 | * Clean up after success/failure of an explicit drive command. | |
347 | * These get thrown onto the queue so they are synchronized with | |
348 | * real I/O operations on the drive. | |
349 | * | |
350 | * In LBA48 mode we have to read the register set twice to get | |
351 | * all the extra information out. | |
352 | */ | |
353 | ||
354 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
355 | { | |
1da177e4 LT |
356 | unsigned long flags; |
357 | struct request *rq; | |
358 | ||
359 | spin_lock_irqsave(&ide_lock, flags); | |
360 | rq = HWGROUP(drive)->rq; | |
361 | spin_unlock_irqrestore(&ide_lock, flags); | |
362 | ||
7267c337 | 363 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
364 | ide_task_t *args = (ide_task_t *) rq->special; |
365 | if (rq->errors == 0) | |
366 | rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT); | |
367 | ||
368 | if (args) { | |
650d841d BZ |
369 | struct ide_taskfile *tf = &args->tf; |
370 | ||
650d841d | 371 | tf->error = err; |
650d841d | 372 | tf->status = stat; |
1da177e4 | 373 | |
c2b57cdc | 374 | ide_tf_read(drive, args); |
1da177e4 LT |
375 | } |
376 | } else if (blk_pm_request(rq)) { | |
c00895ab | 377 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
378 | #ifdef DEBUG_PM |
379 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
380 | drive->name, rq->pm->pm_step, stat, err); | |
381 | #endif | |
382 | ide_complete_power_step(drive, rq, stat, err); | |
ad3cadda | 383 | if (pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
384 | ide_complete_pm_request(drive, rq); |
385 | return; | |
386 | } | |
387 | ||
388 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
389 | HWGROUP(drive)->rq = NULL; |
390 | rq->errors = err; | |
3b0e044d KU |
391 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
392 | blk_rq_bytes(rq)))) | |
5e36bb6e | 393 | BUG(); |
1da177e4 LT |
394 | spin_unlock_irqrestore(&ide_lock, flags); |
395 | } | |
396 | ||
397 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
398 | ||
399 | /** | |
400 | * try_to_flush_leftover_data - flush junk | |
401 | * @drive: drive to flush | |
402 | * | |
403 | * try_to_flush_leftover_data() is invoked in response to a drive | |
404 | * unexpectedly having its DRQ_STAT bit set. As an alternative to | |
405 | * resetting the drive, this routine tries to clear the condition | |
406 | * by read a sector's worth of data from the drive. Of course, | |
407 | * this may not help if the drive is *waiting* for data from *us*. | |
408 | */ | |
409 | static void try_to_flush_leftover_data (ide_drive_t *drive) | |
410 | { | |
411 | int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS; | |
412 | ||
413 | if (drive->media != ide_disk) | |
414 | return; | |
415 | while (i > 0) { | |
416 | u32 buffer[16]; | |
417 | u32 wcount = (i > 16) ? 16 : i; | |
418 | ||
419 | i -= wcount; | |
420 | HWIF(drive)->ata_input_data(drive, buffer, wcount); | |
421 | } | |
422 | } | |
423 | ||
424 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) | |
425 | { | |
426 | if (rq->rq_disk) { | |
427 | ide_driver_t *drv; | |
428 | ||
429 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
430 | drv->end_request(drive, 0, 0); | |
431 | } else | |
432 | ide_end_request(drive, 0, 0); | |
433 | } | |
434 | ||
435 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
436 | { | |
437 | ide_hwif_t *hwif = drive->hwif; | |
438 | ||
439 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
440 | /* other bits are useless when BUSY */ | |
441 | rq->errors |= ERROR_RESET; | |
442 | } else if (stat & ERR_STAT) { | |
443 | /* err has different meaning on cdrom and tape */ | |
444 | if (err == ABRT_ERR) { | |
445 | if (drive->select.b.lba && | |
446 | /* some newer drives don't support WIN_SPECIFY */ | |
447 | hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY) | |
448 | return ide_stopped; | |
449 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
450 | /* UDMA crc error, just retry the operation */ | |
451 | drive->crc_count++; | |
452 | } else if (err & (BBD_ERR | ECC_ERR)) { | |
453 | /* retries won't help these */ | |
454 | rq->errors = ERROR_MAX; | |
455 | } else if (err & TRK0_ERR) { | |
456 | /* help it find track zero */ | |
457 | rq->errors |= ERROR_RECAL; | |
458 | } | |
459 | } | |
460 | ||
ed67b923 BZ |
461 | if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ && |
462 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) | |
1da177e4 LT |
463 | try_to_flush_leftover_data(drive); |
464 | ||
513daadd SS |
465 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
466 | ide_kill_rq(drive, rq); | |
467 | return ide_stopped; | |
468 | } | |
469 | ||
c47137a9 | 470 | if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT)) |
513daadd | 471 | rq->errors |= ERROR_RESET; |
1da177e4 | 472 | |
513daadd | 473 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 474 | ++rq->errors; |
513daadd | 475 | return ide_do_reset(drive); |
1da177e4 | 476 | } |
513daadd SS |
477 | |
478 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
479 | drive->special.b.recalibrate = 1; | |
480 | ||
481 | ++rq->errors; | |
482 | ||
1da177e4 LT |
483 | return ide_stopped; |
484 | } | |
485 | ||
486 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
487 | { | |
488 | ide_hwif_t *hwif = drive->hwif; | |
489 | ||
490 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
491 | /* other bits are useless when BUSY */ | |
492 | rq->errors |= ERROR_RESET; | |
493 | } else { | |
494 | /* add decoding error stuff */ | |
495 | } | |
496 | ||
c47137a9 | 497 | if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT)) |
1da177e4 LT |
498 | /* force an abort */ |
499 | hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG); | |
500 | ||
501 | if (rq->errors >= ERROR_MAX) { | |
502 | ide_kill_rq(drive, rq); | |
503 | } else { | |
504 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
505 | ++rq->errors; | |
506 | return ide_do_reset(drive); | |
507 | } | |
508 | ++rq->errors; | |
509 | } | |
510 | ||
511 | return ide_stopped; | |
512 | } | |
513 | ||
514 | ide_startstop_t | |
515 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
516 | { | |
517 | if (drive->media == ide_disk) | |
518 | return ide_ata_error(drive, rq, stat, err); | |
519 | return ide_atapi_error(drive, rq, stat, err); | |
520 | } | |
521 | ||
522 | EXPORT_SYMBOL_GPL(__ide_error); | |
523 | ||
524 | /** | |
525 | * ide_error - handle an error on the IDE | |
526 | * @drive: drive the error occurred on | |
527 | * @msg: message to report | |
528 | * @stat: status bits | |
529 | * | |
530 | * ide_error() takes action based on the error returned by the drive. | |
531 | * For normal I/O that may well include retries. We deal with | |
532 | * both new-style (taskfile) and old style command handling here. | |
533 | * In the case of taskfile command handling there is work left to | |
534 | * do | |
535 | */ | |
536 | ||
537 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
538 | { | |
539 | struct request *rq; | |
540 | u8 err; | |
541 | ||
542 | err = ide_dump_status(drive, msg, stat); | |
543 | ||
544 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
545 | return ide_stopped; | |
546 | ||
547 | /* retry only "normal" I/O: */ | |
4aff5e23 | 548 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
549 | rq->errors = 1; |
550 | ide_end_drive_cmd(drive, stat, err); | |
551 | return ide_stopped; | |
552 | } | |
553 | ||
554 | if (rq->rq_disk) { | |
555 | ide_driver_t *drv; | |
556 | ||
557 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
558 | return drv->error(drive, rq, stat, err); | |
559 | } else | |
560 | return __ide_error(drive, rq, stat, err); | |
561 | } | |
562 | ||
563 | EXPORT_SYMBOL_GPL(ide_error); | |
564 | ||
565 | ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq) | |
566 | { | |
567 | if (drive->media != ide_disk) | |
568 | rq->errors |= ERROR_RESET; | |
569 | ||
570 | ide_kill_rq(drive, rq); | |
571 | ||
572 | return ide_stopped; | |
573 | } | |
574 | ||
575 | EXPORT_SYMBOL_GPL(__ide_abort); | |
576 | ||
577 | /** | |
338cec32 | 578 | * ide_abort - abort pending IDE operations |
1da177e4 LT |
579 | * @drive: drive the error occurred on |
580 | * @msg: message to report | |
581 | * | |
582 | * ide_abort kills and cleans up when we are about to do a | |
583 | * host initiated reset on active commands. Longer term we | |
584 | * want handlers to have sensible abort handling themselves | |
585 | * | |
586 | * This differs fundamentally from ide_error because in | |
587 | * this case the command is doing just fine when we | |
588 | * blow it away. | |
589 | */ | |
590 | ||
591 | ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg) | |
592 | { | |
593 | struct request *rq; | |
594 | ||
595 | if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL) | |
596 | return ide_stopped; | |
597 | ||
598 | /* retry only "normal" I/O: */ | |
4aff5e23 | 599 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
600 | rq->errors = 1; |
601 | ide_end_drive_cmd(drive, BUSY_STAT, 0); | |
602 | return ide_stopped; | |
603 | } | |
604 | ||
605 | if (rq->rq_disk) { | |
606 | ide_driver_t *drv; | |
607 | ||
608 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
609 | return drv->abort(drive, rq); | |
610 | } else | |
611 | return __ide_abort(drive, rq); | |
612 | } | |
613 | ||
57d7366b | 614 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 615 | { |
57d7366b BZ |
616 | tf->nsect = drive->sect; |
617 | tf->lbal = drive->sect; | |
618 | tf->lbam = drive->cyl; | |
619 | tf->lbah = drive->cyl >> 8; | |
620 | tf->device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA; | |
621 | tf->command = WIN_SPECIFY; | |
1da177e4 LT |
622 | } |
623 | ||
57d7366b | 624 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 625 | { |
57d7366b BZ |
626 | tf->nsect = drive->sect; |
627 | tf->command = WIN_RESTORE; | |
1da177e4 LT |
628 | } |
629 | ||
57d7366b | 630 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 631 | { |
57d7366b BZ |
632 | tf->nsect = drive->mult_req; |
633 | tf->command = WIN_SETMULT; | |
1da177e4 LT |
634 | } |
635 | ||
636 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
637 | { | |
638 | special_t *s = &drive->special; | |
639 | ide_task_t args; | |
640 | ||
641 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 642 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
643 | |
644 | if (s->b.set_geometry) { | |
645 | s->b.set_geometry = 0; | |
57d7366b | 646 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
647 | } else if (s->b.recalibrate) { |
648 | s->b.recalibrate = 0; | |
57d7366b | 649 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
650 | } else if (s->b.set_multmode) { |
651 | s->b.set_multmode = 0; | |
652 | if (drive->mult_req > drive->id->max_multsect) | |
653 | drive->mult_req = drive->id->max_multsect; | |
57d7366b | 654 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
655 | } else if (s->all) { |
656 | int special = s->all; | |
657 | s->all = 0; | |
658 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
659 | return ide_stopped; | |
660 | } | |
661 | ||
657cc1a8 | 662 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 663 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 664 | |
1da177e4 LT |
665 | do_rw_taskfile(drive, &args); |
666 | ||
667 | return ide_started; | |
668 | } | |
669 | ||
26bcb879 BZ |
670 | /* |
671 | * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away | |
672 | */ | |
673 | static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) | |
674 | { | |
675 | switch (req_pio) { | |
676 | case 202: | |
677 | case 201: | |
678 | case 200: | |
679 | case 102: | |
680 | case 101: | |
681 | case 100: | |
682 | return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; | |
683 | case 9: | |
684 | case 8: | |
685 | return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; | |
686 | case 7: | |
687 | case 6: | |
688 | return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; | |
689 | default: | |
690 | return 0; | |
691 | } | |
692 | } | |
693 | ||
1da177e4 LT |
694 | /** |
695 | * do_special - issue some special commands | |
696 | * @drive: drive the command is for | |
697 | * | |
698 | * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT | |
699 | * commands to a drive. It used to do much more, but has been scaled | |
700 | * back. | |
701 | */ | |
702 | ||
703 | static ide_startstop_t do_special (ide_drive_t *drive) | |
704 | { | |
705 | special_t *s = &drive->special; | |
706 | ||
707 | #ifdef DEBUG | |
708 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
709 | #endif | |
710 | if (s->b.set_tune) { | |
26bcb879 BZ |
711 | ide_hwif_t *hwif = drive->hwif; |
712 | u8 req_pio = drive->tune_req; | |
713 | ||
1da177e4 | 714 | s->b.set_tune = 0; |
26bcb879 BZ |
715 | |
716 | if (set_pio_mode_abuse(drive->hwif, req_pio)) { | |
d393aa03 BZ |
717 | |
718 | if (hwif->set_pio_mode == NULL) | |
719 | return ide_stopped; | |
720 | ||
721 | /* | |
722 | * take ide_lock for drive->[no_]unmask/[no_]io_32bit | |
723 | */ | |
724 | if (req_pio == 8 || req_pio == 9) { | |
725 | unsigned long flags; | |
726 | ||
727 | spin_lock_irqsave(&ide_lock, flags); | |
728 | hwif->set_pio_mode(drive, req_pio); | |
729 | spin_unlock_irqrestore(&ide_lock, flags); | |
730 | } else | |
26bcb879 | 731 | hwif->set_pio_mode(drive, req_pio); |
aedea591 BZ |
732 | } else { |
733 | int keep_dma = drive->using_dma; | |
734 | ||
26bcb879 BZ |
735 | ide_set_pio(drive, req_pio); |
736 | ||
aedea591 BZ |
737 | if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { |
738 | if (keep_dma) | |
4a546e04 | 739 | ide_dma_on(drive); |
aedea591 BZ |
740 | } |
741 | } | |
742 | ||
1da177e4 LT |
743 | return ide_stopped; |
744 | } else { | |
745 | if (drive->media == ide_disk) | |
746 | return ide_disk_special(drive); | |
747 | ||
748 | s->all = 0; | |
749 | drive->mult_req = 0; | |
750 | return ide_stopped; | |
751 | } | |
752 | } | |
753 | ||
754 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
755 | { | |
756 | ide_hwif_t *hwif = drive->hwif; | |
757 | struct scatterlist *sg = hwif->sg_table; | |
758 | ||
759 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
760 | return; | |
761 | ||
4aff5e23 | 762 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
763 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
764 | } else { | |
765 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
766 | hwif->sg_nents = 1; | |
767 | } | |
768 | } | |
769 | ||
770 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
771 | ||
772 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
773 | { | |
774 | ide_hwif_t *hwif = drive->hwif; | |
775 | ||
776 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
777 | hwif->cursg_ofs = 0; |
778 | hwif->cursg = NULL; | |
1da177e4 LT |
779 | } |
780 | ||
781 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
782 | ||
783 | /** | |
784 | * execute_drive_command - issue special drive command | |
338cec32 | 785 | * @drive: the drive to issue the command on |
1da177e4 LT |
786 | * @rq: the request structure holding the command |
787 | * | |
788 | * execute_drive_cmd() issues a special drive command, usually | |
789 | * initiated by ioctl() from the external hdparm program. The | |
790 | * command can be a drive command, drive task or taskfile | |
791 | * operation. Weirdly you can call it with NULL to wait for | |
792 | * all commands to finish. Don't do this as that is due to change | |
793 | */ | |
794 | ||
795 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
796 | struct request *rq) | |
797 | { | |
798 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 799 | ide_task_t *task = rq->special; |
1da177e4 | 800 | |
7267c337 | 801 | if (task) { |
21d535c9 | 802 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
803 | |
804 | switch (hwif->data_phase) { | |
805 | case TASKFILE_MULTI_OUT: | |
806 | case TASKFILE_OUT: | |
807 | case TASKFILE_MULTI_IN: | |
808 | case TASKFILE_IN: | |
809 | ide_init_sg_cmd(drive, rq); | |
810 | ide_map_sg(drive, rq); | |
811 | default: | |
812 | break; | |
813 | } | |
74095a91 | 814 | |
21d535c9 BZ |
815 | return do_rw_taskfile(drive, task); |
816 | } | |
817 | ||
1da177e4 LT |
818 | /* |
819 | * NULL is actually a valid way of waiting for | |
820 | * all current requests to be flushed from the queue. | |
821 | */ | |
822 | #ifdef DEBUG | |
823 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
824 | #endif | |
64a57fe4 BZ |
825 | ide_end_drive_cmd(drive, ide_read_status(drive), ide_read_error(drive)); |
826 | ||
1da177e4 LT |
827 | return ide_stopped; |
828 | } | |
829 | ||
ad3cadda JA |
830 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
831 | { | |
c00895ab | 832 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
833 | |
834 | if (blk_pm_suspend_request(rq) && | |
835 | pm->pm_step == ide_pm_state_start_suspend) | |
836 | /* Mark drive blocked when starting the suspend sequence. */ | |
837 | drive->blocked = 1; | |
838 | else if (blk_pm_resume_request(rq) && | |
839 | pm->pm_step == ide_pm_state_start_resume) { | |
840 | /* | |
841 | * The first thing we do on wakeup is to wait for BSY bit to | |
842 | * go away (with a looong timeout) as a drive on this hwif may | |
843 | * just be POSTing itself. | |
844 | * We do that before even selecting as the "other" device on | |
845 | * the bus may be broken enough to walk on our toes at this | |
846 | * point. | |
847 | */ | |
848 | int rc; | |
849 | #ifdef DEBUG_PM | |
850 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
851 | #endif | |
852 | rc = ide_wait_not_busy(HWIF(drive), 35000); | |
853 | if (rc) | |
854 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
855 | SELECT_DRIVE(drive); | |
81ca6919 | 856 | ide_set_irq(drive, 1); |
178184b6 | 857 | rc = ide_wait_not_busy(HWIF(drive), 100000); |
ad3cadda JA |
858 | if (rc) |
859 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
860 | } | |
861 | } | |
862 | ||
1da177e4 LT |
863 | /** |
864 | * start_request - start of I/O and command issuing for IDE | |
865 | * | |
866 | * start_request() initiates handling of a new I/O request. It | |
867 | * accepts commands and I/O (read/write) requests. It also does | |
868 | * the final remapping for weird stuff like EZDrive. Once | |
869 | * device mapper can work sector level the EZDrive stuff can go away | |
870 | * | |
871 | * FIXME: this function needs a rename | |
872 | */ | |
873 | ||
874 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
875 | { | |
876 | ide_startstop_t startstop; | |
877 | sector_t block; | |
878 | ||
4aff5e23 | 879 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
880 | |
881 | #ifdef DEBUG | |
882 | printk("%s: start_request: current=0x%08lx\n", | |
883 | HWIF(drive)->name, (unsigned long) rq); | |
884 | #endif | |
885 | ||
886 | /* bail early if we've exceeded max_failures */ | |
887 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 888 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
889 | goto kill_rq; |
890 | } | |
891 | ||
892 | block = rq->sector; | |
893 | if (blk_fs_request(rq) && | |
894 | (drive->media == ide_disk || drive->media == ide_floppy)) { | |
895 | block += drive->sect0; | |
896 | } | |
897 | /* Yecch - this will shift the entire interval, | |
898 | possibly killing some innocent following sector */ | |
899 | if (block == 0 && drive->remap_0_to_1 == 1) | |
900 | block = 1; /* redirect MBR access to EZ-Drive partn table */ | |
901 | ||
ad3cadda JA |
902 | if (blk_pm_request(rq)) |
903 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
904 | |
905 | SELECT_DRIVE(drive); | |
906 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) { | |
907 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); | |
908 | return startstop; | |
909 | } | |
910 | if (!drive->special.all) { | |
911 | ide_driver_t *drv; | |
912 | ||
513daadd SS |
913 | /* |
914 | * We reset the drive so we need to issue a SETFEATURES. | |
915 | * Do it _after_ do_special() restored device parameters. | |
916 | */ | |
917 | if (drive->current_speed == 0xff) | |
918 | ide_config_drive_speed(drive, drive->desired_speed); | |
919 | ||
7267c337 | 920 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
921 | return execute_drive_cmd(drive, rq); |
922 | else if (blk_pm_request(rq)) { | |
c00895ab | 923 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
924 | #ifdef DEBUG_PM |
925 | printk("%s: start_power_step(step: %d)\n", | |
926 | drive->name, rq->pm->pm_step); | |
927 | #endif | |
928 | startstop = ide_start_power_step(drive, rq); | |
929 | if (startstop == ide_stopped && | |
ad3cadda | 930 | pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
931 | ide_complete_pm_request(drive, rq); |
932 | return startstop; | |
933 | } | |
934 | ||
935 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
936 | return drv->do_request(drive, rq, block); | |
937 | } | |
938 | return do_special(drive); | |
939 | kill_rq: | |
940 | ide_kill_rq(drive, rq); | |
941 | return ide_stopped; | |
942 | } | |
943 | ||
944 | /** | |
945 | * ide_stall_queue - pause an IDE device | |
946 | * @drive: drive to stall | |
947 | * @timeout: time to stall for (jiffies) | |
948 | * | |
949 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
950 | * to the hwgroup by sleeping for timeout jiffies. | |
951 | */ | |
952 | ||
953 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
954 | { | |
955 | if (timeout > WAIT_WORSTCASE) | |
956 | timeout = WAIT_WORSTCASE; | |
957 | drive->sleep = timeout + jiffies; | |
958 | drive->sleeping = 1; | |
959 | } | |
960 | ||
961 | EXPORT_SYMBOL(ide_stall_queue); | |
962 | ||
963 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
964 | ||
965 | /** | |
966 | * choose_drive - select a drive to service | |
967 | * @hwgroup: hardware group to select on | |
968 | * | |
969 | * choose_drive() selects the next drive which will be serviced. | |
970 | * This is necessary because the IDE layer can't issue commands | |
971 | * to both drives on the same cable, unlike SCSI. | |
972 | */ | |
973 | ||
974 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
975 | { | |
976 | ide_drive_t *drive, *best; | |
977 | ||
978 | repeat: | |
979 | best = NULL; | |
980 | drive = hwgroup->drive; | |
981 | ||
982 | /* | |
983 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
984 | * though that is 3 requests, it must be seen as a single transaction. | |
985 | * we must not preempt this drive until that is complete | |
986 | */ | |
987 | if (blk_queue_flushing(drive->queue)) { | |
988 | /* | |
989 | * small race where queue could get replugged during | |
990 | * the 3-request flush cycle, just yank the plug since | |
991 | * we want it to finish asap | |
992 | */ | |
993 | blk_remove_plug(drive->queue); | |
994 | return drive; | |
995 | } | |
996 | ||
997 | do { | |
998 | if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep)) | |
999 | && !elv_queue_empty(drive->queue)) { | |
1000 | if (!best | |
1001 | || (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep))) | |
1002 | || (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best)))) | |
1003 | { | |
1004 | if (!blk_queue_plugged(drive->queue)) | |
1005 | best = drive; | |
1006 | } | |
1007 | } | |
1008 | } while ((drive = drive->next) != hwgroup->drive); | |
1009 | if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1010 | long t = (signed long)(WAKEUP(best) - jiffies); | |
1011 | if (t >= WAIT_MIN_SLEEP) { | |
1012 | /* | |
1013 | * We *may* have some time to spare, but first let's see if | |
1014 | * someone can potentially benefit from our nice mood today.. | |
1015 | */ | |
1016 | drive = best->next; | |
1017 | do { | |
1018 | if (!drive->sleeping | |
1019 | && time_before(jiffies - best->service_time, WAKEUP(drive)) | |
1020 | && time_before(WAKEUP(drive), jiffies + t)) | |
1021 | { | |
1022 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
1023 | goto repeat; | |
1024 | } | |
1025 | } while ((drive = drive->next) != best); | |
1026 | } | |
1027 | } | |
1028 | return best; | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Issue a new request to a drive from hwgroup | |
1033 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
1034 | * | |
1035 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
1036 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
1037 | * may have both interfaces in a single hwgroup to "serialize" access. | |
1038 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
1039 | * together into one hwgroup for serialized access. | |
1040 | * | |
1041 | * Note also that several hwgroups can end up sharing a single IRQ, | |
1042 | * possibly along with many other devices. This is especially common in | |
1043 | * PCI-based systems with off-board IDE controller cards. | |
1044 | * | |
1045 | * The IDE driver uses the single global ide_lock spinlock to protect | |
1046 | * access to the request queues, and to protect the hwgroup->busy flag. | |
1047 | * | |
1048 | * The first thread into the driver for a particular hwgroup sets the | |
1049 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
1050 | * and then initiates processing of the top request from the request queue. | |
1051 | * | |
1052 | * Other threads attempting entry notice the busy setting, and will simply | |
1053 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
1054 | * remains set even when the driver is merely awaiting the next interrupt. | |
1055 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
1056 | * | |
1057 | * When processing of a request completes, the completing thread or IRQ-handler | |
1058 | * will start the next request from the queue. If no more work remains, | |
1059 | * the driver will clear the hwgroup->busy flag and exit. | |
1060 | * | |
1061 | * The ide_lock (spinlock) is used to protect all access to the | |
1062 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
1063 | * the driver. This makes the driver much more friendlier to shared IRQs | |
1064 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
1065 | */ | |
1066 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
1067 | { | |
1068 | ide_drive_t *drive; | |
1069 | ide_hwif_t *hwif; | |
1070 | struct request *rq; | |
1071 | ide_startstop_t startstop; | |
867f8b4e | 1072 | int loops = 0; |
1da177e4 LT |
1073 | |
1074 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
1075 | ide_get_lock(ide_intr, hwgroup); | |
1076 | ||
1077 | /* caller must own ide_lock */ | |
1078 | BUG_ON(!irqs_disabled()); | |
1079 | ||
1080 | while (!hwgroup->busy) { | |
1081 | hwgroup->busy = 1; | |
1082 | drive = choose_drive(hwgroup); | |
1083 | if (drive == NULL) { | |
1084 | int sleeping = 0; | |
1085 | unsigned long sleep = 0; /* shut up, gcc */ | |
1086 | hwgroup->rq = NULL; | |
1087 | drive = hwgroup->drive; | |
1088 | do { | |
1089 | if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) { | |
1090 | sleeping = 1; | |
1091 | sleep = drive->sleep; | |
1092 | } | |
1093 | } while ((drive = drive->next) != hwgroup->drive); | |
1094 | if (sleeping) { | |
1095 | /* | |
1096 | * Take a short snooze, and then wake up this hwgroup again. | |
1097 | * This gives other hwgroups on the same a chance to | |
1098 | * play fairly with us, just in case there are big differences | |
1099 | * in relative throughputs.. don't want to hog the cpu too much. | |
1100 | */ | |
1101 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1102 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1103 | #if 1 | |
1104 | if (timer_pending(&hwgroup->timer)) | |
1105 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1106 | #endif | |
1107 | /* so that ide_timer_expiry knows what to do */ | |
1108 | hwgroup->sleeping = 1; | |
23450319 | 1109 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1110 | mod_timer(&hwgroup->timer, sleep); |
1111 | /* we purposely leave hwgroup->busy==1 | |
1112 | * while sleeping */ | |
1113 | } else { | |
1114 | /* Ugly, but how can we sleep for the lock | |
1115 | * otherwise? perhaps from tq_disk? | |
1116 | */ | |
1117 | ||
1118 | /* for atari only */ | |
1119 | ide_release_lock(); | |
1120 | hwgroup->busy = 0; | |
1121 | } | |
1122 | ||
1123 | /* no more work for this hwgroup (for now) */ | |
1124 | return; | |
1125 | } | |
867f8b4e | 1126 | again: |
1da177e4 | 1127 | hwif = HWIF(drive); |
81ca6919 | 1128 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1129 | /* |
1130 | * set nIEN for previous hwif, drives in the | |
1131 | * quirk_list may not like intr setups/cleanups | |
1132 | */ | |
1133 | if (drive->quirk_list != 1) | |
81ca6919 | 1134 | ide_set_irq(drive, 0); |
1da177e4 LT |
1135 | } |
1136 | hwgroup->hwif = hwif; | |
1137 | hwgroup->drive = drive; | |
1138 | drive->sleeping = 0; | |
1139 | drive->service_start = jiffies; | |
1140 | ||
1141 | if (blk_queue_plugged(drive->queue)) { | |
1142 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1143 | break; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * we know that the queue isn't empty, but this can happen | |
1148 | * if the q->prep_rq_fn() decides to kill a request | |
1149 | */ | |
1150 | rq = elv_next_request(drive->queue); | |
1151 | if (!rq) { | |
1152 | hwgroup->busy = 0; | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Sanity: don't accept a request that isn't a PM request | |
1158 | * if we are currently power managed. This is very important as | |
1159 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1160 | * above to return us whatever is in the queue. Since we call | |
1161 | * ide_do_request() ourselves, we end up taking requests while | |
1162 | * the queue is blocked... | |
1163 | * | |
1164 | * We let requests forced at head of queue with ide-preempt | |
1165 | * though. I hope that doesn't happen too much, hopefully not | |
1166 | * unless the subdriver triggers such a thing in its own PM | |
1167 | * state machine. | |
867f8b4e BH |
1168 | * |
1169 | * We count how many times we loop here to make sure we service | |
1170 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1171 | */ |
4aff5e23 | 1172 | if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) { |
867f8b4e BH |
1173 | drive = drive->next ? drive->next : hwgroup->drive; |
1174 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1175 | goto again; | |
1da177e4 LT |
1176 | /* We clear busy, there should be no pending ATA command at this point. */ |
1177 | hwgroup->busy = 0; | |
1178 | break; | |
1179 | } | |
1180 | ||
1181 | hwgroup->rq = rq; | |
1182 | ||
1183 | /* | |
1184 | * Some systems have trouble with IDE IRQs arriving while | |
1185 | * the driver is still setting things up. So, here we disable | |
1186 | * the IRQ used by this interface while the request is being started. | |
1187 | * This may look bad at first, but pretty much the same thing | |
1188 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1189 | * -- the kernel masks the IRQ while it is being handled. | |
1190 | */ | |
1191 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1192 | disable_irq_nosync(hwif->irq); | |
1193 | spin_unlock(&ide_lock); | |
366c7f55 | 1194 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1195 | /* allow other IRQs while we start this request */ |
1196 | startstop = start_request(drive, rq); | |
1197 | spin_lock_irq(&ide_lock); | |
1198 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1199 | enable_irq(hwif->irq); | |
1200 | if (startstop == ide_stopped) | |
1201 | hwgroup->busy = 0; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Passes the stuff to ide_do_request | |
1207 | */ | |
165125e1 | 1208 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1209 | { |
1210 | ide_drive_t *drive = q->queuedata; | |
1211 | ||
1212 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1217 | * retry the current request in pio mode instead of risking tossing it | |
1218 | * all away | |
1219 | */ | |
1220 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1221 | { | |
1222 | ide_hwif_t *hwif = HWIF(drive); | |
1223 | struct request *rq; | |
1224 | ide_startstop_t ret = ide_stopped; | |
1225 | ||
1226 | /* | |
1227 | * end current dma transaction | |
1228 | */ | |
1229 | ||
1230 | if (error < 0) { | |
1231 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
1232 | (void)HWIF(drive)->ide_dma_end(drive); | |
1233 | ret = ide_error(drive, "dma timeout error", | |
c47137a9 | 1234 | ide_read_status(drive)); |
1da177e4 LT |
1235 | } else { |
1236 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
c283f5db | 1237 | hwif->dma_timeout(drive); |
1da177e4 LT |
1238 | } |
1239 | ||
1240 | /* | |
1241 | * disable dma for now, but remember that we did so because of | |
1242 | * a timeout -- we'll reenable after we finish this next request | |
1243 | * (or rather the first chunk of it) in pio. | |
1244 | */ | |
1245 | drive->retry_pio++; | |
1246 | drive->state = DMA_PIO_RETRY; | |
4a546e04 | 1247 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1248 | |
1249 | /* | |
1250 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1251 | * make sure request is sane | |
1252 | */ | |
1253 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1254 | |
1255 | if (!rq) | |
1256 | goto out; | |
1257 | ||
1da177e4 LT |
1258 | HWGROUP(drive)->rq = NULL; |
1259 | ||
1260 | rq->errors = 0; | |
1261 | ||
1262 | if (!rq->bio) | |
1263 | goto out; | |
1264 | ||
1265 | rq->sector = rq->bio->bi_sector; | |
1266 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1267 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1268 | rq->buffer = bio_data(rq->bio); | |
1269 | out: | |
1270 | return ret; | |
1271 | } | |
1272 | ||
1273 | /** | |
1274 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1275 | * @data: timer callback magic (hwgroup) | |
1276 | * | |
1277 | * An IDE command has timed out before the expected drive return | |
1278 | * occurred. At this point we attempt to clean up the current | |
1279 | * mess. If the current handler includes an expiry handler then | |
1280 | * we invoke the expiry handler, and providing it is happy the | |
1281 | * work is done. If that fails we apply generic recovery rules | |
1282 | * invoking the handler and checking the drive DMA status. We | |
1283 | * have an excessively incestuous relationship with the DMA | |
1284 | * logic that wants cleaning up. | |
1285 | */ | |
1286 | ||
1287 | void ide_timer_expiry (unsigned long data) | |
1288 | { | |
1289 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1290 | ide_handler_t *handler; | |
1291 | ide_expiry_t *expiry; | |
1292 | unsigned long flags; | |
1293 | unsigned long wait = -1; | |
1294 | ||
1295 | spin_lock_irqsave(&ide_lock, flags); | |
1296 | ||
23450319 SS |
1297 | if (((handler = hwgroup->handler) == NULL) || |
1298 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1299 | /* |
1300 | * Either a marginal timeout occurred | |
1301 | * (got the interrupt just as timer expired), | |
1302 | * or we were "sleeping" to give other devices a chance. | |
1303 | * Either way, we don't really want to complain about anything. | |
1304 | */ | |
1305 | if (hwgroup->sleeping) { | |
1306 | hwgroup->sleeping = 0; | |
1307 | hwgroup->busy = 0; | |
1308 | } | |
1309 | } else { | |
1310 | ide_drive_t *drive = hwgroup->drive; | |
1311 | if (!drive) { | |
1312 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1313 | hwgroup->handler = NULL; | |
1314 | } else { | |
1315 | ide_hwif_t *hwif; | |
1316 | ide_startstop_t startstop = ide_stopped; | |
1317 | if (!hwgroup->busy) { | |
1318 | hwgroup->busy = 1; /* paranoia */ | |
1319 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1320 | } | |
1321 | if ((expiry = hwgroup->expiry) != NULL) { | |
1322 | /* continue */ | |
1323 | if ((wait = expiry(drive)) > 0) { | |
1324 | /* reset timer */ | |
1325 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1326 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1327 | add_timer(&hwgroup->timer); |
1328 | spin_unlock_irqrestore(&ide_lock, flags); | |
1329 | return; | |
1330 | } | |
1331 | } | |
1332 | hwgroup->handler = NULL; | |
1333 | /* | |
1334 | * We need to simulate a real interrupt when invoking | |
1335 | * the handler() function, which means we need to | |
1336 | * globally mask the specific IRQ: | |
1337 | */ | |
1338 | spin_unlock(&ide_lock); | |
1339 | hwif = HWIF(drive); | |
1da177e4 LT |
1340 | /* disable_irq_nosync ?? */ |
1341 | disable_irq(hwif->irq); | |
1da177e4 LT |
1342 | /* local CPU only, |
1343 | * as if we were handling an interrupt */ | |
1344 | local_irq_disable(); | |
1345 | if (hwgroup->polling) { | |
1346 | startstop = handler(drive); | |
1347 | } else if (drive_is_ready(drive)) { | |
1348 | if (drive->waiting_for_dma) | |
841d2a9b | 1349 | hwgroup->hwif->dma_lost_irq(drive); |
1da177e4 LT |
1350 | (void)ide_ack_intr(hwif); |
1351 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1352 | startstop = handler(drive); | |
1353 | } else { | |
1354 | if (drive->waiting_for_dma) { | |
1355 | startstop = ide_dma_timeout_retry(drive, wait); | |
1356 | } else | |
1357 | startstop = | |
c47137a9 BZ |
1358 | ide_error(drive, "irq timeout", |
1359 | ide_read_status(drive)); | |
1da177e4 LT |
1360 | } |
1361 | drive->service_time = jiffies - drive->service_start; | |
1362 | spin_lock_irq(&ide_lock); | |
1363 | enable_irq(hwif->irq); | |
1364 | if (startstop == ide_stopped) | |
1365 | hwgroup->busy = 0; | |
1366 | } | |
1367 | } | |
1368 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1369 | spin_unlock_irqrestore(&ide_lock, flags); | |
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * unexpected_intr - handle an unexpected IDE interrupt | |
1374 | * @irq: interrupt line | |
1375 | * @hwgroup: hwgroup being processed | |
1376 | * | |
1377 | * There's nothing really useful we can do with an unexpected interrupt, | |
1378 | * other than reading the status register (to clear it), and logging it. | |
1379 | * There should be no way that an irq can happen before we're ready for it, | |
1380 | * so we needn't worry much about losing an "important" interrupt here. | |
1381 | * | |
1382 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1383 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1384 | * looks "good", we just ignore the interrupt completely. | |
1385 | * | |
1386 | * This routine assumes __cli() is in effect when called. | |
1387 | * | |
1388 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1389 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1390 | * we could screw up by interfering with a new request being set up for | |
1391 | * irq15. | |
1392 | * | |
1393 | * In reality, this is a non-issue. The new command is not sent unless | |
1394 | * the drive is ready to accept one, in which case we know the drive is | |
1395 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1396 | * before completing the issuance of any new drive command, so we will not | |
1397 | * be accidentally invoked as a result of any valid command completion | |
1398 | * interrupt. | |
1399 | * | |
1400 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1401 | * is doing the current command, but we don't know which hwif burped | |
1402 | * mysteriously. | |
1403 | */ | |
1404 | ||
1405 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1406 | { | |
1407 | u8 stat; | |
1408 | ide_hwif_t *hwif = hwgroup->hwif; | |
1409 | ||
1410 | /* | |
1411 | * handle the unexpected interrupt | |
1412 | */ | |
1413 | do { | |
1414 | if (hwif->irq == irq) { | |
1415 | stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); | |
1416 | if (!OK_STAT(stat, READY_STAT, BAD_STAT)) { | |
1417 | /* Try to not flood the console with msgs */ | |
1418 | static unsigned long last_msgtime, count; | |
1419 | ++count; | |
1420 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1421 | last_msgtime = jiffies; | |
1422 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1423 | "status=0x%02x, count=%ld\n", | |
1424 | hwif->name, | |
1425 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1426 | } | |
1427 | } | |
1428 | } | |
1429 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1430 | } | |
1431 | ||
1432 | /** | |
1433 | * ide_intr - default IDE interrupt handler | |
1434 | * @irq: interrupt number | |
1435 | * @dev_id: hwif group | |
1436 | * @regs: unused weirdness from the kernel irq layer | |
1437 | * | |
1438 | * This is the default IRQ handler for the IDE layer. You should | |
1439 | * not need to override it. If you do be aware it is subtle in | |
1440 | * places | |
1441 | * | |
1442 | * hwgroup->hwif is the interface in the group currently performing | |
1443 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1444 | * the IRQ handler to call. As we issue a command the handlers | |
1445 | * step through multiple states, reassigning the handler to the | |
1446 | * next step in the process. Unlike a smart SCSI controller IDE | |
1447 | * expects the main processor to sequence the various transfer | |
1448 | * stages. We also manage a poll timer to catch up with most | |
1449 | * timeout situations. There are still a few where the handlers | |
1450 | * don't ever decide to give up. | |
1451 | * | |
1452 | * The handler eventually returns ide_stopped to indicate the | |
1453 | * request completed. At this point we issue the next request | |
1454 | * on the hwgroup and the process begins again. | |
1455 | */ | |
1456 | ||
7d12e780 | 1457 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1458 | { |
1459 | unsigned long flags; | |
1460 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1461 | ide_hwif_t *hwif; | |
1462 | ide_drive_t *drive; | |
1463 | ide_handler_t *handler; | |
1464 | ide_startstop_t startstop; | |
1465 | ||
1466 | spin_lock_irqsave(&ide_lock, flags); | |
1467 | hwif = hwgroup->hwif; | |
1468 | ||
1469 | if (!ide_ack_intr(hwif)) { | |
1470 | spin_unlock_irqrestore(&ide_lock, flags); | |
1471 | return IRQ_NONE; | |
1472 | } | |
1473 | ||
1474 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1475 | /* | |
1476 | * Not expecting an interrupt from this drive. | |
1477 | * That means this could be: | |
1478 | * (1) an interrupt from another PCI device | |
1479 | * sharing the same PCI INT# as us. | |
1480 | * or (2) a drive just entered sleep or standby mode, | |
1481 | * and is interrupting to let us know. | |
1482 | * or (3) a spurious interrupt of unknown origin. | |
1483 | * | |
1484 | * For PCI, we cannot tell the difference, | |
1485 | * so in that case we just ignore it and hope it goes away. | |
1486 | * | |
1487 | * FIXME: unexpected_intr should be hwif-> then we can | |
1488 | * remove all the ifdef PCI crap | |
1489 | */ | |
1490 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1491 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1492 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1493 | { | |
1494 | /* | |
1495 | * Probably not a shared PCI interrupt, | |
1496 | * so we can safely try to do something about it: | |
1497 | */ | |
1498 | unexpected_intr(irq, hwgroup); | |
1499 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1500 | } else { | |
1501 | /* | |
1502 | * Whack the status register, just in case | |
1503 | * we have a leftover pending IRQ. | |
1504 | */ | |
1505 | (void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); | |
1506 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | |
1507 | } | |
1508 | spin_unlock_irqrestore(&ide_lock, flags); | |
1509 | return IRQ_NONE; | |
1510 | } | |
1511 | drive = hwgroup->drive; | |
1512 | if (!drive) { | |
1513 | /* | |
1514 | * This should NEVER happen, and there isn't much | |
1515 | * we could do about it here. | |
1516 | * | |
1517 | * [Note - this can occur if the drive is hot unplugged] | |
1518 | */ | |
1519 | spin_unlock_irqrestore(&ide_lock, flags); | |
1520 | return IRQ_HANDLED; | |
1521 | } | |
1522 | if (!drive_is_ready(drive)) { | |
1523 | /* | |
1524 | * This happens regularly when we share a PCI IRQ with | |
1525 | * another device. Unfortunately, it can also happen | |
1526 | * with some buggy drives that trigger the IRQ before | |
1527 | * their status register is up to date. Hopefully we have | |
1528 | * enough advance overhead that the latter isn't a problem. | |
1529 | */ | |
1530 | spin_unlock_irqrestore(&ide_lock, flags); | |
1531 | return IRQ_NONE; | |
1532 | } | |
1533 | if (!hwgroup->busy) { | |
1534 | hwgroup->busy = 1; /* paranoia */ | |
1535 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1536 | } | |
1537 | hwgroup->handler = NULL; | |
23450319 | 1538 | hwgroup->req_gen++; |
1da177e4 LT |
1539 | del_timer(&hwgroup->timer); |
1540 | spin_unlock(&ide_lock); | |
1541 | ||
f0dd8712 AL |
1542 | /* Some controllers might set DMA INTR no matter DMA or PIO; |
1543 | * bmdma status might need to be cleared even for | |
1544 | * PIO interrupts to prevent spurious/lost irq. | |
1545 | */ | |
1546 | if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma)) | |
1547 | /* ide_dma_end() needs bmdma status for error checking. | |
1548 | * So, skip clearing bmdma status here and leave it | |
1549 | * to ide_dma_end() if this is dma interrupt. | |
1550 | */ | |
1551 | hwif->ide_dma_clear_irq(drive); | |
1552 | ||
1da177e4 | 1553 | if (drive->unmask) |
366c7f55 | 1554 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1555 | /* service this interrupt, may set handler for next interrupt */ |
1556 | startstop = handler(drive); | |
1557 | spin_lock_irq(&ide_lock); | |
1558 | ||
1559 | /* | |
1560 | * Note that handler() may have set things up for another | |
1561 | * interrupt to occur soon, but it cannot happen until | |
1562 | * we exit from this routine, because it will be the | |
1563 | * same irq as is currently being serviced here, and Linux | |
1564 | * won't allow another of the same (on any CPU) until we return. | |
1565 | */ | |
1566 | drive->service_time = jiffies - drive->service_start; | |
1567 | if (startstop == ide_stopped) { | |
1568 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1569 | hwgroup->busy = 0; | |
1570 | ide_do_request(hwgroup, hwif->irq); | |
1571 | } else { | |
1572 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1573 | "on exit\n", drive->name); | |
1574 | } | |
1575 | } | |
1576 | spin_unlock_irqrestore(&ide_lock, flags); | |
1577 | return IRQ_HANDLED; | |
1578 | } | |
1579 | ||
1580 | /** | |
1581 | * ide_init_drive_cmd - initialize a drive command request | |
1582 | * @rq: request object | |
1583 | * | |
1584 | * Initialize a request before we fill it in and send it down to | |
1585 | * ide_do_drive_cmd. Commands must be set up by this function. Right | |
1586 | * now it doesn't do a lot, but if that changes abusers will have a | |
d6e05edc | 1587 | * nasty surprise. |
1da177e4 LT |
1588 | */ |
1589 | ||
1590 | void ide_init_drive_cmd (struct request *rq) | |
1591 | { | |
1592 | memset(rq, 0, sizeof(*rq)); | |
1da177e4 LT |
1593 | rq->ref_count = 1; |
1594 | } | |
1595 | ||
1596 | EXPORT_SYMBOL(ide_init_drive_cmd); | |
1597 | ||
1598 | /** | |
1599 | * ide_do_drive_cmd - issue IDE special command | |
1600 | * @drive: device to issue command | |
1601 | * @rq: request to issue | |
1602 | * @action: action for processing | |
1603 | * | |
1604 | * This function issues a special IDE device request | |
1605 | * onto the request queue. | |
1606 | * | |
1607 | * If action is ide_wait, then the rq is queued at the end of the | |
1608 | * request queue, and the function sleeps until it has been processed. | |
1609 | * This is for use when invoked from an ioctl handler. | |
1610 | * | |
1611 | * If action is ide_preempt, then the rq is queued at the head of | |
1612 | * the request queue, displacing the currently-being-processed | |
1613 | * request and this function returns immediately without waiting | |
1614 | * for the new rq to be completed. This is VERY DANGEROUS, and is | |
1615 | * intended for careful use by the ATAPI tape/cdrom driver code. | |
1616 | * | |
1da177e4 LT |
1617 | * If action is ide_end, then the rq is queued at the end of the |
1618 | * request queue, and the function returns immediately without waiting | |
1619 | * for the new rq to be completed. This is again intended for careful | |
1620 | * use by the ATAPI tape/cdrom driver code. | |
1621 | */ | |
1622 | ||
1623 | int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action) | |
1624 | { | |
1625 | unsigned long flags; | |
1626 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
60be6b9a | 1627 | DECLARE_COMPLETION_ONSTACK(wait); |
1da177e4 LT |
1628 | int where = ELEVATOR_INSERT_BACK, err; |
1629 | int must_wait = (action == ide_wait || action == ide_head_wait); | |
1630 | ||
1631 | rq->errors = 0; | |
1da177e4 LT |
1632 | |
1633 | /* | |
1634 | * we need to hold an extra reference to request for safe inspection | |
1635 | * after completion | |
1636 | */ | |
1637 | if (must_wait) { | |
1638 | rq->ref_count++; | |
c00895ab | 1639 | rq->end_io_data = &wait; |
1da177e4 LT |
1640 | rq->end_io = blk_end_sync_rq; |
1641 | } | |
1642 | ||
1643 | spin_lock_irqsave(&ide_lock, flags); | |
1644 | if (action == ide_preempt) | |
1645 | hwgroup->rq = NULL; | |
1646 | if (action == ide_preempt || action == ide_head_wait) { | |
1647 | where = ELEVATOR_INSERT_FRONT; | |
4aff5e23 | 1648 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
1649 | } |
1650 | __elv_add_request(drive->queue, rq, where, 0); | |
1651 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1652 | spin_unlock_irqrestore(&ide_lock, flags); | |
1653 | ||
1654 | err = 0; | |
1655 | if (must_wait) { | |
1656 | wait_for_completion(&wait); | |
1da177e4 LT |
1657 | if (rq->errors) |
1658 | err = -EIO; | |
1659 | ||
1660 | blk_put_request(rq); | |
1661 | } | |
1662 | ||
1663 | return err; | |
1664 | } | |
1665 | ||
1666 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1667 | |
1668 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1669 | { | |
1670 | ide_task_t task; | |
1671 | ||
1672 | memset(&task, 0, sizeof(task)); | |
1673 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1674 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1675 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1676 | task.tf.lbam = bcount & 0xff; | |
1677 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1678 | ||
1679 | ide_tf_load(drive, &task); | |
1680 | } | |
1681 | ||
1682 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); |