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> | |
50 | ||
51 | #include <asm/byteorder.h> | |
52 | #include <asm/irq.h> | |
53 | #include <asm/uaccess.h> | |
54 | #include <asm/io.h> | |
55 | #include <asm/bitops.h> | |
56 | ||
a7ff7d41 AB |
57 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
58 | int uptodate, int nr_sectors) | |
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)) | |
67 | nr_sectors = rq->hard_nr_sectors; | |
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; | |
78 | HWGROUP(drive)->hwif->ide_dma_on(drive); | |
79 | } | |
80 | ||
ba027def JA |
81 | if (!end_that_request_first(rq, uptodate, nr_sectors)) { |
82 | add_disk_randomness(rq->rq_disk); | |
ce42f191 HZ |
83 | if (!list_empty(&rq->queuelist)) |
84 | blkdev_dequeue_request(rq); | |
1da177e4 | 85 | HWGROUP(drive)->rq = NULL; |
ba027def | 86 | end_that_request_last(rq, uptodate); |
1da177e4 LT |
87 | ret = 0; |
88 | } | |
8672d571 | 89 | |
1da177e4 LT |
90 | return ret; |
91 | } | |
1da177e4 LT |
92 | |
93 | /** | |
94 | * ide_end_request - complete an IDE I/O | |
95 | * @drive: IDE device for the I/O | |
96 | * @uptodate: | |
97 | * @nr_sectors: number of sectors completed | |
98 | * | |
99 | * This is our end_request wrapper function. We complete the I/O | |
100 | * update random number input and dequeue the request, which if | |
101 | * it was tagged may be out of order. | |
102 | */ | |
103 | ||
104 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
105 | { | |
106 | struct request *rq; | |
107 | unsigned long flags; | |
108 | int ret = 1; | |
109 | ||
8672d571 JA |
110 | /* |
111 | * room for locking improvements here, the calls below don't | |
112 | * need the queue lock held at all | |
113 | */ | |
1da177e4 LT |
114 | spin_lock_irqsave(&ide_lock, flags); |
115 | rq = HWGROUP(drive)->rq; | |
116 | ||
117 | if (!nr_sectors) | |
118 | nr_sectors = rq->hard_cur_sectors; | |
119 | ||
3e087b57 | 120 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors); |
1da177e4 LT |
121 | |
122 | spin_unlock_irqrestore(&ide_lock, flags); | |
123 | return ret; | |
124 | } | |
125 | EXPORT_SYMBOL(ide_end_request); | |
126 | ||
127 | /* | |
128 | * Power Management state machine. This one is rather trivial for now, | |
129 | * we should probably add more, like switching back to PIO on suspend | |
130 | * to help some BIOSes, re-do the door locking on resume, etc... | |
131 | */ | |
132 | ||
133 | enum { | |
134 | ide_pm_flush_cache = ide_pm_state_start_suspend, | |
135 | idedisk_pm_standby, | |
136 | ||
137 | idedisk_pm_idle = ide_pm_state_start_resume, | |
138 | ide_pm_restore_dma, | |
139 | }; | |
140 | ||
141 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) | |
142 | { | |
c00895ab | 143 | struct request_pm_state *pm = rq->data; |
ad3cadda | 144 | |
1da177e4 LT |
145 | if (drive->media != ide_disk) |
146 | return; | |
147 | ||
ad3cadda | 148 | switch (pm->pm_step) { |
1da177e4 | 149 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */ |
ad3cadda JA |
150 | if (pm->pm_state == PM_EVENT_FREEZE) |
151 | pm->pm_step = ide_pm_state_completed; | |
1da177e4 | 152 | else |
ad3cadda | 153 | pm->pm_step = idedisk_pm_standby; |
1da177e4 LT |
154 | break; |
155 | case idedisk_pm_standby: /* Suspend step 2 (standby) complete */ | |
ad3cadda | 156 | pm->pm_step = ide_pm_state_completed; |
1da177e4 LT |
157 | break; |
158 | case idedisk_pm_idle: /* Resume step 1 (idle) complete */ | |
ad3cadda | 159 | pm->pm_step = ide_pm_restore_dma; |
1da177e4 LT |
160 | break; |
161 | } | |
162 | } | |
163 | ||
164 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
165 | { | |
c00895ab | 166 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
167 | ide_task_t *args = rq->special; |
168 | ||
169 | memset(args, 0, sizeof(*args)); | |
170 | ||
171 | if (drive->media != ide_disk) { | |
172 | /* skip idedisk_pm_idle for ATAPI devices */ | |
ad3cadda JA |
173 | if (pm->pm_step == idedisk_pm_idle) |
174 | pm->pm_step = ide_pm_restore_dma; | |
1da177e4 LT |
175 | } |
176 | ||
ad3cadda | 177 | switch (pm->pm_step) { |
1da177e4 LT |
178 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */ |
179 | if (drive->media != ide_disk) | |
180 | break; | |
181 | /* Not supported? Switch to next step now. */ | |
182 | if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) { | |
183 | ide_complete_power_step(drive, rq, 0, 0); | |
184 | return ide_stopped; | |
185 | } | |
186 | if (ide_id_has_flush_cache_ext(drive->id)) | |
187 | args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT; | |
188 | else | |
189 | args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE; | |
190 | args->command_type = IDE_DRIVE_TASK_NO_DATA; | |
191 | args->handler = &task_no_data_intr; | |
192 | return do_rw_taskfile(drive, args); | |
193 | ||
194 | case idedisk_pm_standby: /* Suspend step 2 (standby) */ | |
195 | args->tfRegister[IDE_COMMAND_OFFSET] = WIN_STANDBYNOW1; | |
196 | args->command_type = IDE_DRIVE_TASK_NO_DATA; | |
197 | args->handler = &task_no_data_intr; | |
198 | return do_rw_taskfile(drive, args); | |
199 | ||
200 | case idedisk_pm_idle: /* Resume step 1 (idle) */ | |
201 | args->tfRegister[IDE_COMMAND_OFFSET] = WIN_IDLEIMMEDIATE; | |
202 | args->command_type = IDE_DRIVE_TASK_NO_DATA; | |
203 | args->handler = task_no_data_intr; | |
204 | return do_rw_taskfile(drive, args); | |
205 | ||
206 | case ide_pm_restore_dma: /* Resume step 2 (restore DMA) */ | |
207 | /* | |
208 | * Right now, all we do is call hwif->ide_dma_check(drive), | |
209 | * we could be smarter and check for current xfer_speed | |
210 | * in struct drive etc... | |
211 | */ | |
212 | if ((drive->id->capability & 1) == 0) | |
213 | break; | |
214 | if (drive->hwif->ide_dma_check == NULL) | |
215 | break; | |
216 | drive->hwif->ide_dma_check(drive); | |
217 | break; | |
218 | } | |
ad3cadda | 219 | pm->pm_step = ide_pm_state_completed; |
1da177e4 LT |
220 | return ide_stopped; |
221 | } | |
222 | ||
dbe217af AC |
223 | /** |
224 | * ide_end_dequeued_request - complete an IDE I/O | |
225 | * @drive: IDE device for the I/O | |
226 | * @uptodate: | |
227 | * @nr_sectors: number of sectors completed | |
228 | * | |
229 | * Complete an I/O that is no longer on the request queue. This | |
230 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
231 | * We must still finish the old request but we must not tamper with the | |
232 | * queue in the meantime. | |
233 | * | |
234 | * NOTE: This path does not handle barrier, but barrier is not supported | |
235 | * on ide-cd anyway. | |
236 | */ | |
237 | ||
238 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
239 | int uptodate, int nr_sectors) | |
240 | { | |
241 | unsigned long flags; | |
242 | int ret = 1; | |
243 | ||
244 | spin_lock_irqsave(&ide_lock, flags); | |
245 | ||
4aff5e23 | 246 | BUG_ON(!blk_rq_started(rq)); |
dbe217af AC |
247 | |
248 | /* | |
249 | * if failfast is set on a request, override number of sectors and | |
250 | * complete the whole request right now | |
251 | */ | |
252 | if (blk_noretry_request(rq) && end_io_error(uptodate)) | |
253 | nr_sectors = rq->hard_nr_sectors; | |
254 | ||
255 | if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors) | |
256 | rq->errors = -EIO; | |
257 | ||
258 | /* | |
259 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
260 | * if we DMA timeout more than 3 times, just stay in PIO | |
261 | */ | |
262 | if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) { | |
263 | drive->state = 0; | |
264 | HWGROUP(drive)->hwif->ide_dma_on(drive); | |
265 | } | |
266 | ||
267 | if (!end_that_request_first(rq, uptodate, nr_sectors)) { | |
268 | add_disk_randomness(rq->rq_disk); | |
269 | if (blk_rq_tagged(rq)) | |
270 | blk_queue_end_tag(drive->queue, rq); | |
271 | end_that_request_last(rq, uptodate); | |
272 | ret = 0; | |
273 | } | |
274 | spin_unlock_irqrestore(&ide_lock, flags); | |
275 | return ret; | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
278 | ||
279 | ||
1da177e4 LT |
280 | /** |
281 | * ide_complete_pm_request - end the current Power Management request | |
282 | * @drive: target drive | |
283 | * @rq: request | |
284 | * | |
285 | * This function cleans up the current PM request and stops the queue | |
286 | * if necessary. | |
287 | */ | |
288 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
289 | { | |
290 | unsigned long flags; | |
291 | ||
292 | #ifdef DEBUG_PM | |
293 | printk("%s: completing PM request, %s\n", drive->name, | |
294 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
295 | #endif | |
296 | spin_lock_irqsave(&ide_lock, flags); | |
297 | if (blk_pm_suspend_request(rq)) { | |
298 | blk_stop_queue(drive->queue); | |
299 | } else { | |
300 | drive->blocked = 0; | |
301 | blk_start_queue(drive->queue); | |
302 | } | |
303 | blkdev_dequeue_request(rq); | |
304 | HWGROUP(drive)->rq = NULL; | |
8ffdc655 | 305 | end_that_request_last(rq, 1); |
1da177e4 LT |
306 | spin_unlock_irqrestore(&ide_lock, flags); |
307 | } | |
308 | ||
309 | /* | |
310 | * FIXME: probably move this somewhere else, name is bad too :) | |
311 | */ | |
312 | u64 ide_get_error_location(ide_drive_t *drive, char *args) | |
313 | { | |
314 | u32 high, low; | |
315 | u8 hcyl, lcyl, sect; | |
316 | u64 sector; | |
317 | ||
318 | high = 0; | |
319 | hcyl = args[5]; | |
320 | lcyl = args[4]; | |
321 | sect = args[3]; | |
322 | ||
323 | if (ide_id_has_flush_cache_ext(drive->id)) { | |
324 | low = (hcyl << 16) | (lcyl << 8) | sect; | |
325 | HWIF(drive)->OUTB(drive->ctl|0x80, IDE_CONTROL_REG); | |
326 | high = ide_read_24(drive); | |
327 | } else { | |
328 | u8 cur = HWIF(drive)->INB(IDE_SELECT_REG); | |
329 | if (cur & 0x40) { | |
330 | high = cur & 0xf; | |
331 | low = (hcyl << 16) | (lcyl << 8) | sect; | |
332 | } else { | |
333 | low = hcyl * drive->head * drive->sect; | |
334 | low += lcyl * drive->sect; | |
335 | low += sect - 1; | |
336 | } | |
337 | } | |
338 | ||
339 | sector = ((u64) high << 24) | low; | |
340 | return sector; | |
341 | } | |
342 | EXPORT_SYMBOL(ide_get_error_location); | |
343 | ||
344 | /** | |
345 | * ide_end_drive_cmd - end an explicit drive command | |
346 | * @drive: command | |
347 | * @stat: status bits | |
348 | * @err: error bits | |
349 | * | |
350 | * Clean up after success/failure of an explicit drive command. | |
351 | * These get thrown onto the queue so they are synchronized with | |
352 | * real I/O operations on the drive. | |
353 | * | |
354 | * In LBA48 mode we have to read the register set twice to get | |
355 | * all the extra information out. | |
356 | */ | |
357 | ||
358 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
359 | { | |
360 | ide_hwif_t *hwif = HWIF(drive); | |
361 | unsigned long flags; | |
362 | struct request *rq; | |
363 | ||
364 | spin_lock_irqsave(&ide_lock, flags); | |
365 | rq = HWGROUP(drive)->rq; | |
366 | spin_unlock_irqrestore(&ide_lock, flags); | |
367 | ||
4aff5e23 | 368 | if (rq->cmd_type == REQ_TYPE_ATA_CMD) { |
1da177e4 LT |
369 | u8 *args = (u8 *) rq->buffer; |
370 | if (rq->errors == 0) | |
371 | rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT); | |
372 | ||
373 | if (args) { | |
374 | args[0] = stat; | |
375 | args[1] = err; | |
376 | args[2] = hwif->INB(IDE_NSECTOR_REG); | |
377 | } | |
4aff5e23 | 378 | } else if (rq->cmd_type == REQ_TYPE_ATA_TASK) { |
1da177e4 LT |
379 | u8 *args = (u8 *) rq->buffer; |
380 | if (rq->errors == 0) | |
381 | rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT); | |
382 | ||
383 | if (args) { | |
384 | args[0] = stat; | |
385 | args[1] = err; | |
386 | args[2] = hwif->INB(IDE_NSECTOR_REG); | |
387 | args[3] = hwif->INB(IDE_SECTOR_REG); | |
388 | args[4] = hwif->INB(IDE_LCYL_REG); | |
389 | args[5] = hwif->INB(IDE_HCYL_REG); | |
390 | args[6] = hwif->INB(IDE_SELECT_REG); | |
391 | } | |
4aff5e23 | 392 | } else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
393 | ide_task_t *args = (ide_task_t *) rq->special; |
394 | if (rq->errors == 0) | |
395 | rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT); | |
396 | ||
397 | if (args) { | |
398 | if (args->tf_in_flags.b.data) { | |
399 | u16 data = hwif->INW(IDE_DATA_REG); | |
400 | args->tfRegister[IDE_DATA_OFFSET] = (data) & 0xFF; | |
401 | args->hobRegister[IDE_DATA_OFFSET] = (data >> 8) & 0xFF; | |
402 | } | |
403 | args->tfRegister[IDE_ERROR_OFFSET] = err; | |
404 | /* be sure we're looking at the low order bits */ | |
405 | hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG); | |
406 | args->tfRegister[IDE_NSECTOR_OFFSET] = hwif->INB(IDE_NSECTOR_REG); | |
407 | args->tfRegister[IDE_SECTOR_OFFSET] = hwif->INB(IDE_SECTOR_REG); | |
408 | args->tfRegister[IDE_LCYL_OFFSET] = hwif->INB(IDE_LCYL_REG); | |
409 | args->tfRegister[IDE_HCYL_OFFSET] = hwif->INB(IDE_HCYL_REG); | |
410 | args->tfRegister[IDE_SELECT_OFFSET] = hwif->INB(IDE_SELECT_REG); | |
411 | args->tfRegister[IDE_STATUS_OFFSET] = stat; | |
412 | ||
413 | if (drive->addressing == 1) { | |
414 | hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG); | |
415 | args->hobRegister[IDE_FEATURE_OFFSET] = hwif->INB(IDE_FEATURE_REG); | |
416 | args->hobRegister[IDE_NSECTOR_OFFSET] = hwif->INB(IDE_NSECTOR_REG); | |
417 | args->hobRegister[IDE_SECTOR_OFFSET] = hwif->INB(IDE_SECTOR_REG); | |
418 | args->hobRegister[IDE_LCYL_OFFSET] = hwif->INB(IDE_LCYL_REG); | |
419 | args->hobRegister[IDE_HCYL_OFFSET] = hwif->INB(IDE_HCYL_REG); | |
420 | } | |
421 | } | |
422 | } else if (blk_pm_request(rq)) { | |
c00895ab | 423 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
424 | #ifdef DEBUG_PM |
425 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
426 | drive->name, rq->pm->pm_step, stat, err); | |
427 | #endif | |
428 | ide_complete_power_step(drive, rq, stat, err); | |
ad3cadda | 429 | if (pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
430 | ide_complete_pm_request(drive, rq); |
431 | return; | |
432 | } | |
433 | ||
434 | spin_lock_irqsave(&ide_lock, flags); | |
435 | blkdev_dequeue_request(rq); | |
436 | HWGROUP(drive)->rq = NULL; | |
437 | rq->errors = err; | |
8ffdc655 | 438 | end_that_request_last(rq, !rq->errors); |
1da177e4 LT |
439 | spin_unlock_irqrestore(&ide_lock, flags); |
440 | } | |
441 | ||
442 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
443 | ||
444 | /** | |
445 | * try_to_flush_leftover_data - flush junk | |
446 | * @drive: drive to flush | |
447 | * | |
448 | * try_to_flush_leftover_data() is invoked in response to a drive | |
449 | * unexpectedly having its DRQ_STAT bit set. As an alternative to | |
450 | * resetting the drive, this routine tries to clear the condition | |
451 | * by read a sector's worth of data from the drive. Of course, | |
452 | * this may not help if the drive is *waiting* for data from *us*. | |
453 | */ | |
454 | static void try_to_flush_leftover_data (ide_drive_t *drive) | |
455 | { | |
456 | int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS; | |
457 | ||
458 | if (drive->media != ide_disk) | |
459 | return; | |
460 | while (i > 0) { | |
461 | u32 buffer[16]; | |
462 | u32 wcount = (i > 16) ? 16 : i; | |
463 | ||
464 | i -= wcount; | |
465 | HWIF(drive)->ata_input_data(drive, buffer, wcount); | |
466 | } | |
467 | } | |
468 | ||
469 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) | |
470 | { | |
471 | if (rq->rq_disk) { | |
472 | ide_driver_t *drv; | |
473 | ||
474 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
475 | drv->end_request(drive, 0, 0); | |
476 | } else | |
477 | ide_end_request(drive, 0, 0); | |
478 | } | |
479 | ||
480 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
481 | { | |
482 | ide_hwif_t *hwif = drive->hwif; | |
483 | ||
484 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
485 | /* other bits are useless when BUSY */ | |
486 | rq->errors |= ERROR_RESET; | |
487 | } else if (stat & ERR_STAT) { | |
488 | /* err has different meaning on cdrom and tape */ | |
489 | if (err == ABRT_ERR) { | |
490 | if (drive->select.b.lba && | |
491 | /* some newer drives don't support WIN_SPECIFY */ | |
492 | hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY) | |
493 | return ide_stopped; | |
494 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
495 | /* UDMA crc error, just retry the operation */ | |
496 | drive->crc_count++; | |
497 | } else if (err & (BBD_ERR | ECC_ERR)) { | |
498 | /* retries won't help these */ | |
499 | rq->errors = ERROR_MAX; | |
500 | } else if (err & TRK0_ERR) { | |
501 | /* help it find track zero */ | |
502 | rq->errors |= ERROR_RECAL; | |
503 | } | |
504 | } | |
505 | ||
da574af7 | 506 | if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ && hwif->err_stops_fifo == 0) |
1da177e4 LT |
507 | try_to_flush_leftover_data(drive); |
508 | ||
509 | if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) | |
510 | /* force an abort */ | |
511 | hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG); | |
512 | ||
513 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) | |
514 | ide_kill_rq(drive, rq); | |
515 | else { | |
516 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
517 | ++rq->errors; | |
518 | return ide_do_reset(drive); | |
519 | } | |
520 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
521 | drive->special.b.recalibrate = 1; | |
522 | ++rq->errors; | |
523 | } | |
524 | return ide_stopped; | |
525 | } | |
526 | ||
527 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
528 | { | |
529 | ide_hwif_t *hwif = drive->hwif; | |
530 | ||
531 | if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { | |
532 | /* other bits are useless when BUSY */ | |
533 | rq->errors |= ERROR_RESET; | |
534 | } else { | |
535 | /* add decoding error stuff */ | |
536 | } | |
537 | ||
538 | if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) | |
539 | /* force an abort */ | |
540 | hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG); | |
541 | ||
542 | if (rq->errors >= ERROR_MAX) { | |
543 | ide_kill_rq(drive, rq); | |
544 | } else { | |
545 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
546 | ++rq->errors; | |
547 | return ide_do_reset(drive); | |
548 | } | |
549 | ++rq->errors; | |
550 | } | |
551 | ||
552 | return ide_stopped; | |
553 | } | |
554 | ||
555 | ide_startstop_t | |
556 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
557 | { | |
558 | if (drive->media == ide_disk) | |
559 | return ide_ata_error(drive, rq, stat, err); | |
560 | return ide_atapi_error(drive, rq, stat, err); | |
561 | } | |
562 | ||
563 | EXPORT_SYMBOL_GPL(__ide_error); | |
564 | ||
565 | /** | |
566 | * ide_error - handle an error on the IDE | |
567 | * @drive: drive the error occurred on | |
568 | * @msg: message to report | |
569 | * @stat: status bits | |
570 | * | |
571 | * ide_error() takes action based on the error returned by the drive. | |
572 | * For normal I/O that may well include retries. We deal with | |
573 | * both new-style (taskfile) and old style command handling here. | |
574 | * In the case of taskfile command handling there is work left to | |
575 | * do | |
576 | */ | |
577 | ||
578 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
579 | { | |
580 | struct request *rq; | |
581 | u8 err; | |
582 | ||
583 | err = ide_dump_status(drive, msg, stat); | |
584 | ||
585 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
586 | return ide_stopped; | |
587 | ||
588 | /* retry only "normal" I/O: */ | |
4aff5e23 | 589 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
590 | rq->errors = 1; |
591 | ide_end_drive_cmd(drive, stat, err); | |
592 | return ide_stopped; | |
593 | } | |
594 | ||
595 | if (rq->rq_disk) { | |
596 | ide_driver_t *drv; | |
597 | ||
598 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
599 | return drv->error(drive, rq, stat, err); | |
600 | } else | |
601 | return __ide_error(drive, rq, stat, err); | |
602 | } | |
603 | ||
604 | EXPORT_SYMBOL_GPL(ide_error); | |
605 | ||
606 | ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq) | |
607 | { | |
608 | if (drive->media != ide_disk) | |
609 | rq->errors |= ERROR_RESET; | |
610 | ||
611 | ide_kill_rq(drive, rq); | |
612 | ||
613 | return ide_stopped; | |
614 | } | |
615 | ||
616 | EXPORT_SYMBOL_GPL(__ide_abort); | |
617 | ||
618 | /** | |
338cec32 | 619 | * ide_abort - abort pending IDE operations |
1da177e4 LT |
620 | * @drive: drive the error occurred on |
621 | * @msg: message to report | |
622 | * | |
623 | * ide_abort kills and cleans up when we are about to do a | |
624 | * host initiated reset on active commands. Longer term we | |
625 | * want handlers to have sensible abort handling themselves | |
626 | * | |
627 | * This differs fundamentally from ide_error because in | |
628 | * this case the command is doing just fine when we | |
629 | * blow it away. | |
630 | */ | |
631 | ||
632 | ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg) | |
633 | { | |
634 | struct request *rq; | |
635 | ||
636 | if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL) | |
637 | return ide_stopped; | |
638 | ||
639 | /* retry only "normal" I/O: */ | |
4aff5e23 | 640 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
641 | rq->errors = 1; |
642 | ide_end_drive_cmd(drive, BUSY_STAT, 0); | |
643 | return ide_stopped; | |
644 | } | |
645 | ||
646 | if (rq->rq_disk) { | |
647 | ide_driver_t *drv; | |
648 | ||
649 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
650 | return drv->abort(drive, rq); | |
651 | } else | |
652 | return __ide_abort(drive, rq); | |
653 | } | |
654 | ||
655 | /** | |
656 | * ide_cmd - issue a simple drive command | |
657 | * @drive: drive the command is for | |
658 | * @cmd: command byte | |
659 | * @nsect: sector byte | |
660 | * @handler: handler for the command completion | |
661 | * | |
662 | * Issue a simple drive command with interrupts. | |
663 | * The drive must be selected beforehand. | |
664 | */ | |
665 | ||
666 | static void ide_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, | |
667 | ide_handler_t *handler) | |
668 | { | |
669 | ide_hwif_t *hwif = HWIF(drive); | |
670 | if (IDE_CONTROL_REG) | |
671 | hwif->OUTB(drive->ctl,IDE_CONTROL_REG); /* clear nIEN */ | |
672 | SELECT_MASK(drive,0); | |
673 | hwif->OUTB(nsect,IDE_NSECTOR_REG); | |
674 | ide_execute_command(drive, cmd, handler, WAIT_CMD, NULL); | |
675 | } | |
676 | ||
677 | /** | |
678 | * drive_cmd_intr - drive command completion interrupt | |
679 | * @drive: drive the completion interrupt occurred on | |
680 | * | |
681 | * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD. | |
338cec32 | 682 | * We do any necessary data reading and then wait for the drive to |
1da177e4 LT |
683 | * go non busy. At that point we may read the error data and complete |
684 | * the request | |
685 | */ | |
686 | ||
687 | static ide_startstop_t drive_cmd_intr (ide_drive_t *drive) | |
688 | { | |
689 | struct request *rq = HWGROUP(drive)->rq; | |
690 | ide_hwif_t *hwif = HWIF(drive); | |
691 | u8 *args = (u8 *) rq->buffer; | |
692 | u8 stat = hwif->INB(IDE_STATUS_REG); | |
693 | int retries = 10; | |
694 | ||
366c7f55 | 695 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
696 | if ((stat & DRQ_STAT) && args && args[3]) { |
697 | u8 io_32bit = drive->io_32bit; | |
698 | drive->io_32bit = 0; | |
699 | hwif->ata_input_data(drive, &args[4], args[3] * SECTOR_WORDS); | |
700 | drive->io_32bit = io_32bit; | |
701 | while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--) | |
702 | udelay(100); | |
703 | } | |
704 | ||
705 | if (!OK_STAT(stat, READY_STAT, BAD_STAT)) | |
706 | return ide_error(drive, "drive_cmd", stat); | |
707 | /* calls ide_end_drive_cmd */ | |
708 | ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG)); | |
709 | return ide_stopped; | |
710 | } | |
711 | ||
712 | static void ide_init_specify_cmd(ide_drive_t *drive, ide_task_t *task) | |
713 | { | |
714 | task->tfRegister[IDE_NSECTOR_OFFSET] = drive->sect; | |
715 | task->tfRegister[IDE_SECTOR_OFFSET] = drive->sect; | |
716 | task->tfRegister[IDE_LCYL_OFFSET] = drive->cyl; | |
717 | task->tfRegister[IDE_HCYL_OFFSET] = drive->cyl>>8; | |
718 | task->tfRegister[IDE_SELECT_OFFSET] = ((drive->head-1)|drive->select.all)&0xBF; | |
719 | task->tfRegister[IDE_COMMAND_OFFSET] = WIN_SPECIFY; | |
720 | ||
721 | task->handler = &set_geometry_intr; | |
722 | } | |
723 | ||
724 | static void ide_init_restore_cmd(ide_drive_t *drive, ide_task_t *task) | |
725 | { | |
726 | task->tfRegister[IDE_NSECTOR_OFFSET] = drive->sect; | |
727 | task->tfRegister[IDE_COMMAND_OFFSET] = WIN_RESTORE; | |
728 | ||
729 | task->handler = &recal_intr; | |
730 | } | |
731 | ||
732 | static void ide_init_setmult_cmd(ide_drive_t *drive, ide_task_t *task) | |
733 | { | |
734 | task->tfRegister[IDE_NSECTOR_OFFSET] = drive->mult_req; | |
735 | task->tfRegister[IDE_COMMAND_OFFSET] = WIN_SETMULT; | |
736 | ||
737 | task->handler = &set_multmode_intr; | |
738 | } | |
739 | ||
740 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
741 | { | |
742 | special_t *s = &drive->special; | |
743 | ide_task_t args; | |
744 | ||
745 | memset(&args, 0, sizeof(ide_task_t)); | |
746 | args.command_type = IDE_DRIVE_TASK_NO_DATA; | |
747 | ||
748 | if (s->b.set_geometry) { | |
749 | s->b.set_geometry = 0; | |
750 | ide_init_specify_cmd(drive, &args); | |
751 | } else if (s->b.recalibrate) { | |
752 | s->b.recalibrate = 0; | |
753 | ide_init_restore_cmd(drive, &args); | |
754 | } else if (s->b.set_multmode) { | |
755 | s->b.set_multmode = 0; | |
756 | if (drive->mult_req > drive->id->max_multsect) | |
757 | drive->mult_req = drive->id->max_multsect; | |
758 | ide_init_setmult_cmd(drive, &args); | |
759 | } else if (s->all) { | |
760 | int special = s->all; | |
761 | s->all = 0; | |
762 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
763 | return ide_stopped; | |
764 | } | |
765 | ||
766 | do_rw_taskfile(drive, &args); | |
767 | ||
768 | return ide_started; | |
769 | } | |
770 | ||
771 | /** | |
772 | * do_special - issue some special commands | |
773 | * @drive: drive the command is for | |
774 | * | |
775 | * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT | |
776 | * commands to a drive. It used to do much more, but has been scaled | |
777 | * back. | |
778 | */ | |
779 | ||
780 | static ide_startstop_t do_special (ide_drive_t *drive) | |
781 | { | |
782 | special_t *s = &drive->special; | |
783 | ||
784 | #ifdef DEBUG | |
785 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
786 | #endif | |
787 | if (s->b.set_tune) { | |
788 | s->b.set_tune = 0; | |
789 | if (HWIF(drive)->tuneproc != NULL) | |
790 | HWIF(drive)->tuneproc(drive, drive->tune_req); | |
791 | return ide_stopped; | |
792 | } else { | |
793 | if (drive->media == ide_disk) | |
794 | return ide_disk_special(drive); | |
795 | ||
796 | s->all = 0; | |
797 | drive->mult_req = 0; | |
798 | return ide_stopped; | |
799 | } | |
800 | } | |
801 | ||
802 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
803 | { | |
804 | ide_hwif_t *hwif = drive->hwif; | |
805 | struct scatterlist *sg = hwif->sg_table; | |
806 | ||
807 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
808 | return; | |
809 | ||
4aff5e23 | 810 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
811 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
812 | } else { | |
813 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
814 | hwif->sg_nents = 1; | |
815 | } | |
816 | } | |
817 | ||
818 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
819 | ||
820 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
821 | { | |
822 | ide_hwif_t *hwif = drive->hwif; | |
823 | ||
824 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
825 | hwif->cursg = hwif->cursg_ofs = 0; | |
826 | } | |
827 | ||
828 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
829 | ||
830 | /** | |
831 | * execute_drive_command - issue special drive command | |
338cec32 | 832 | * @drive: the drive to issue the command on |
1da177e4 LT |
833 | * @rq: the request structure holding the command |
834 | * | |
835 | * execute_drive_cmd() issues a special drive command, usually | |
836 | * initiated by ioctl() from the external hdparm program. The | |
837 | * command can be a drive command, drive task or taskfile | |
838 | * operation. Weirdly you can call it with NULL to wait for | |
839 | * all commands to finish. Don't do this as that is due to change | |
840 | */ | |
841 | ||
842 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
843 | struct request *rq) | |
844 | { | |
845 | ide_hwif_t *hwif = HWIF(drive); | |
4aff5e23 | 846 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
847 | ide_task_t *args = rq->special; |
848 | ||
849 | if (!args) | |
850 | goto done; | |
851 | ||
852 | hwif->data_phase = args->data_phase; | |
853 | ||
854 | switch (hwif->data_phase) { | |
855 | case TASKFILE_MULTI_OUT: | |
856 | case TASKFILE_OUT: | |
857 | case TASKFILE_MULTI_IN: | |
858 | case TASKFILE_IN: | |
859 | ide_init_sg_cmd(drive, rq); | |
860 | ide_map_sg(drive, rq); | |
861 | default: | |
862 | break; | |
863 | } | |
864 | ||
865 | if (args->tf_out_flags.all != 0) | |
866 | return flagged_taskfile(drive, args); | |
867 | return do_rw_taskfile(drive, args); | |
4aff5e23 | 868 | } else if (rq->cmd_type == REQ_TYPE_ATA_TASK) { |
1da177e4 LT |
869 | u8 *args = rq->buffer; |
870 | u8 sel; | |
871 | ||
872 | if (!args) | |
873 | goto done; | |
874 | #ifdef DEBUG | |
875 | printk("%s: DRIVE_TASK_CMD ", drive->name); | |
876 | printk("cmd=0x%02x ", args[0]); | |
877 | printk("fr=0x%02x ", args[1]); | |
878 | printk("ns=0x%02x ", args[2]); | |
879 | printk("sc=0x%02x ", args[3]); | |
880 | printk("lcyl=0x%02x ", args[4]); | |
881 | printk("hcyl=0x%02x ", args[5]); | |
882 | printk("sel=0x%02x\n", args[6]); | |
883 | #endif | |
884 | hwif->OUTB(args[1], IDE_FEATURE_REG); | |
885 | hwif->OUTB(args[3], IDE_SECTOR_REG); | |
886 | hwif->OUTB(args[4], IDE_LCYL_REG); | |
887 | hwif->OUTB(args[5], IDE_HCYL_REG); | |
888 | sel = (args[6] & ~0x10); | |
889 | if (drive->select.b.unit) | |
890 | sel |= 0x10; | |
891 | hwif->OUTB(sel, IDE_SELECT_REG); | |
892 | ide_cmd(drive, args[0], args[2], &drive_cmd_intr); | |
893 | return ide_started; | |
4aff5e23 | 894 | } else if (rq->cmd_type == REQ_TYPE_ATA_CMD) { |
1da177e4 LT |
895 | u8 *args = rq->buffer; |
896 | ||
897 | if (!args) | |
898 | goto done; | |
899 | #ifdef DEBUG | |
900 | printk("%s: DRIVE_CMD ", drive->name); | |
901 | printk("cmd=0x%02x ", args[0]); | |
902 | printk("sc=0x%02x ", args[1]); | |
903 | printk("fr=0x%02x ", args[2]); | |
904 | printk("xx=0x%02x\n", args[3]); | |
905 | #endif | |
906 | if (args[0] == WIN_SMART) { | |
907 | hwif->OUTB(0x4f, IDE_LCYL_REG); | |
908 | hwif->OUTB(0xc2, IDE_HCYL_REG); | |
909 | hwif->OUTB(args[2],IDE_FEATURE_REG); | |
910 | hwif->OUTB(args[1],IDE_SECTOR_REG); | |
911 | ide_cmd(drive, args[0], args[3], &drive_cmd_intr); | |
912 | return ide_started; | |
913 | } | |
914 | hwif->OUTB(args[2],IDE_FEATURE_REG); | |
915 | ide_cmd(drive, args[0], args[1], &drive_cmd_intr); | |
916 | return ide_started; | |
917 | } | |
918 | ||
919 | done: | |
920 | /* | |
921 | * NULL is actually a valid way of waiting for | |
922 | * all current requests to be flushed from the queue. | |
923 | */ | |
924 | #ifdef DEBUG | |
925 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
926 | #endif | |
927 | ide_end_drive_cmd(drive, | |
928 | hwif->INB(IDE_STATUS_REG), | |
929 | hwif->INB(IDE_ERROR_REG)); | |
930 | return ide_stopped; | |
931 | } | |
932 | ||
ad3cadda JA |
933 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
934 | { | |
c00895ab | 935 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
936 | |
937 | if (blk_pm_suspend_request(rq) && | |
938 | pm->pm_step == ide_pm_state_start_suspend) | |
939 | /* Mark drive blocked when starting the suspend sequence. */ | |
940 | drive->blocked = 1; | |
941 | else if (blk_pm_resume_request(rq) && | |
942 | pm->pm_step == ide_pm_state_start_resume) { | |
943 | /* | |
944 | * The first thing we do on wakeup is to wait for BSY bit to | |
945 | * go away (with a looong timeout) as a drive on this hwif may | |
946 | * just be POSTing itself. | |
947 | * We do that before even selecting as the "other" device on | |
948 | * the bus may be broken enough to walk on our toes at this | |
949 | * point. | |
950 | */ | |
951 | int rc; | |
952 | #ifdef DEBUG_PM | |
953 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
954 | #endif | |
955 | rc = ide_wait_not_busy(HWIF(drive), 35000); | |
956 | if (rc) | |
957 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
958 | SELECT_DRIVE(drive); | |
959 | HWIF(drive)->OUTB(8, HWIF(drive)->io_ports[IDE_CONTROL_OFFSET]); | |
178184b6 | 960 | rc = ide_wait_not_busy(HWIF(drive), 100000); |
ad3cadda JA |
961 | if (rc) |
962 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
963 | } | |
964 | } | |
965 | ||
1da177e4 LT |
966 | /** |
967 | * start_request - start of I/O and command issuing for IDE | |
968 | * | |
969 | * start_request() initiates handling of a new I/O request. It | |
970 | * accepts commands and I/O (read/write) requests. It also does | |
971 | * the final remapping for weird stuff like EZDrive. Once | |
972 | * device mapper can work sector level the EZDrive stuff can go away | |
973 | * | |
974 | * FIXME: this function needs a rename | |
975 | */ | |
976 | ||
977 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
978 | { | |
979 | ide_startstop_t startstop; | |
980 | sector_t block; | |
981 | ||
4aff5e23 | 982 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
983 | |
984 | #ifdef DEBUG | |
985 | printk("%s: start_request: current=0x%08lx\n", | |
986 | HWIF(drive)->name, (unsigned long) rq); | |
987 | #endif | |
988 | ||
989 | /* bail early if we've exceeded max_failures */ | |
990 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
991 | goto kill_rq; | |
992 | } | |
993 | ||
994 | block = rq->sector; | |
995 | if (blk_fs_request(rq) && | |
996 | (drive->media == ide_disk || drive->media == ide_floppy)) { | |
997 | block += drive->sect0; | |
998 | } | |
999 | /* Yecch - this will shift the entire interval, | |
1000 | possibly killing some innocent following sector */ | |
1001 | if (block == 0 && drive->remap_0_to_1 == 1) | |
1002 | block = 1; /* redirect MBR access to EZ-Drive partn table */ | |
1003 | ||
ad3cadda JA |
1004 | if (blk_pm_request(rq)) |
1005 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
1006 | |
1007 | SELECT_DRIVE(drive); | |
1008 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) { | |
1009 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); | |
1010 | return startstop; | |
1011 | } | |
1012 | if (!drive->special.all) { | |
1013 | ide_driver_t *drv; | |
1014 | ||
4aff5e23 JA |
1015 | if (rq->cmd_type == REQ_TYPE_ATA_CMD || |
1016 | rq->cmd_type == REQ_TYPE_ATA_TASK || | |
1017 | rq->cmd_type == REQ_TYPE_ATA_TASKFILE) | |
1da177e4 LT |
1018 | return execute_drive_cmd(drive, rq); |
1019 | else if (blk_pm_request(rq)) { | |
c00895ab | 1020 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
1021 | #ifdef DEBUG_PM |
1022 | printk("%s: start_power_step(step: %d)\n", | |
1023 | drive->name, rq->pm->pm_step); | |
1024 | #endif | |
1025 | startstop = ide_start_power_step(drive, rq); | |
1026 | if (startstop == ide_stopped && | |
ad3cadda | 1027 | pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
1028 | ide_complete_pm_request(drive, rq); |
1029 | return startstop; | |
1030 | } | |
1031 | ||
1032 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
1033 | return drv->do_request(drive, rq, block); | |
1034 | } | |
1035 | return do_special(drive); | |
1036 | kill_rq: | |
1037 | ide_kill_rq(drive, rq); | |
1038 | return ide_stopped; | |
1039 | } | |
1040 | ||
1041 | /** | |
1042 | * ide_stall_queue - pause an IDE device | |
1043 | * @drive: drive to stall | |
1044 | * @timeout: time to stall for (jiffies) | |
1045 | * | |
1046 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
1047 | * to the hwgroup by sleeping for timeout jiffies. | |
1048 | */ | |
1049 | ||
1050 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
1051 | { | |
1052 | if (timeout > WAIT_WORSTCASE) | |
1053 | timeout = WAIT_WORSTCASE; | |
1054 | drive->sleep = timeout + jiffies; | |
1055 | drive->sleeping = 1; | |
1056 | } | |
1057 | ||
1058 | EXPORT_SYMBOL(ide_stall_queue); | |
1059 | ||
1060 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
1061 | ||
1062 | /** | |
1063 | * choose_drive - select a drive to service | |
1064 | * @hwgroup: hardware group to select on | |
1065 | * | |
1066 | * choose_drive() selects the next drive which will be serviced. | |
1067 | * This is necessary because the IDE layer can't issue commands | |
1068 | * to both drives on the same cable, unlike SCSI. | |
1069 | */ | |
1070 | ||
1071 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
1072 | { | |
1073 | ide_drive_t *drive, *best; | |
1074 | ||
1075 | repeat: | |
1076 | best = NULL; | |
1077 | drive = hwgroup->drive; | |
1078 | ||
1079 | /* | |
1080 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
1081 | * though that is 3 requests, it must be seen as a single transaction. | |
1082 | * we must not preempt this drive until that is complete | |
1083 | */ | |
1084 | if (blk_queue_flushing(drive->queue)) { | |
1085 | /* | |
1086 | * small race where queue could get replugged during | |
1087 | * the 3-request flush cycle, just yank the plug since | |
1088 | * we want it to finish asap | |
1089 | */ | |
1090 | blk_remove_plug(drive->queue); | |
1091 | return drive; | |
1092 | } | |
1093 | ||
1094 | do { | |
1095 | if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep)) | |
1096 | && !elv_queue_empty(drive->queue)) { | |
1097 | if (!best | |
1098 | || (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep))) | |
1099 | || (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best)))) | |
1100 | { | |
1101 | if (!blk_queue_plugged(drive->queue)) | |
1102 | best = drive; | |
1103 | } | |
1104 | } | |
1105 | } while ((drive = drive->next) != hwgroup->drive); | |
1106 | if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1107 | long t = (signed long)(WAKEUP(best) - jiffies); | |
1108 | if (t >= WAIT_MIN_SLEEP) { | |
1109 | /* | |
1110 | * We *may* have some time to spare, but first let's see if | |
1111 | * someone can potentially benefit from our nice mood today.. | |
1112 | */ | |
1113 | drive = best->next; | |
1114 | do { | |
1115 | if (!drive->sleeping | |
1116 | && time_before(jiffies - best->service_time, WAKEUP(drive)) | |
1117 | && time_before(WAKEUP(drive), jiffies + t)) | |
1118 | { | |
1119 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
1120 | goto repeat; | |
1121 | } | |
1122 | } while ((drive = drive->next) != best); | |
1123 | } | |
1124 | } | |
1125 | return best; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Issue a new request to a drive from hwgroup | |
1130 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
1131 | * | |
1132 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
1133 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
1134 | * may have both interfaces in a single hwgroup to "serialize" access. | |
1135 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
1136 | * together into one hwgroup for serialized access. | |
1137 | * | |
1138 | * Note also that several hwgroups can end up sharing a single IRQ, | |
1139 | * possibly along with many other devices. This is especially common in | |
1140 | * PCI-based systems with off-board IDE controller cards. | |
1141 | * | |
1142 | * The IDE driver uses the single global ide_lock spinlock to protect | |
1143 | * access to the request queues, and to protect the hwgroup->busy flag. | |
1144 | * | |
1145 | * The first thread into the driver for a particular hwgroup sets the | |
1146 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
1147 | * and then initiates processing of the top request from the request queue. | |
1148 | * | |
1149 | * Other threads attempting entry notice the busy setting, and will simply | |
1150 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
1151 | * remains set even when the driver is merely awaiting the next interrupt. | |
1152 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
1153 | * | |
1154 | * When processing of a request completes, the completing thread or IRQ-handler | |
1155 | * will start the next request from the queue. If no more work remains, | |
1156 | * the driver will clear the hwgroup->busy flag and exit. | |
1157 | * | |
1158 | * The ide_lock (spinlock) is used to protect all access to the | |
1159 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
1160 | * the driver. This makes the driver much more friendlier to shared IRQs | |
1161 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
1162 | */ | |
1163 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
1164 | { | |
1165 | ide_drive_t *drive; | |
1166 | ide_hwif_t *hwif; | |
1167 | struct request *rq; | |
1168 | ide_startstop_t startstop; | |
867f8b4e | 1169 | int loops = 0; |
1da177e4 LT |
1170 | |
1171 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
1172 | ide_get_lock(ide_intr, hwgroup); | |
1173 | ||
1174 | /* caller must own ide_lock */ | |
1175 | BUG_ON(!irqs_disabled()); | |
1176 | ||
1177 | while (!hwgroup->busy) { | |
1178 | hwgroup->busy = 1; | |
1179 | drive = choose_drive(hwgroup); | |
1180 | if (drive == NULL) { | |
1181 | int sleeping = 0; | |
1182 | unsigned long sleep = 0; /* shut up, gcc */ | |
1183 | hwgroup->rq = NULL; | |
1184 | drive = hwgroup->drive; | |
1185 | do { | |
1186 | if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) { | |
1187 | sleeping = 1; | |
1188 | sleep = drive->sleep; | |
1189 | } | |
1190 | } while ((drive = drive->next) != hwgroup->drive); | |
1191 | if (sleeping) { | |
1192 | /* | |
1193 | * Take a short snooze, and then wake up this hwgroup again. | |
1194 | * This gives other hwgroups on the same a chance to | |
1195 | * play fairly with us, just in case there are big differences | |
1196 | * in relative throughputs.. don't want to hog the cpu too much. | |
1197 | */ | |
1198 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1199 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1200 | #if 1 | |
1201 | if (timer_pending(&hwgroup->timer)) | |
1202 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1203 | #endif | |
1204 | /* so that ide_timer_expiry knows what to do */ | |
1205 | hwgroup->sleeping = 1; | |
1206 | mod_timer(&hwgroup->timer, sleep); | |
1207 | /* we purposely leave hwgroup->busy==1 | |
1208 | * while sleeping */ | |
1209 | } else { | |
1210 | /* Ugly, but how can we sleep for the lock | |
1211 | * otherwise? perhaps from tq_disk? | |
1212 | */ | |
1213 | ||
1214 | /* for atari only */ | |
1215 | ide_release_lock(); | |
1216 | hwgroup->busy = 0; | |
1217 | } | |
1218 | ||
1219 | /* no more work for this hwgroup (for now) */ | |
1220 | return; | |
1221 | } | |
867f8b4e | 1222 | again: |
1da177e4 LT |
1223 | hwif = HWIF(drive); |
1224 | if (hwgroup->hwif->sharing_irq && | |
1225 | hwif != hwgroup->hwif && | |
1226 | hwif->io_ports[IDE_CONTROL_OFFSET]) { | |
1227 | /* set nIEN for previous hwif */ | |
1228 | SELECT_INTERRUPT(drive); | |
1229 | } | |
1230 | hwgroup->hwif = hwif; | |
1231 | hwgroup->drive = drive; | |
1232 | drive->sleeping = 0; | |
1233 | drive->service_start = jiffies; | |
1234 | ||
1235 | if (blk_queue_plugged(drive->queue)) { | |
1236 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * we know that the queue isn't empty, but this can happen | |
1242 | * if the q->prep_rq_fn() decides to kill a request | |
1243 | */ | |
1244 | rq = elv_next_request(drive->queue); | |
1245 | if (!rq) { | |
1246 | hwgroup->busy = 0; | |
1247 | break; | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Sanity: don't accept a request that isn't a PM request | |
1252 | * if we are currently power managed. This is very important as | |
1253 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1254 | * above to return us whatever is in the queue. Since we call | |
1255 | * ide_do_request() ourselves, we end up taking requests while | |
1256 | * the queue is blocked... | |
1257 | * | |
1258 | * We let requests forced at head of queue with ide-preempt | |
1259 | * though. I hope that doesn't happen too much, hopefully not | |
1260 | * unless the subdriver triggers such a thing in its own PM | |
1261 | * state machine. | |
867f8b4e BH |
1262 | * |
1263 | * We count how many times we loop here to make sure we service | |
1264 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1265 | */ |
4aff5e23 | 1266 | if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) { |
867f8b4e BH |
1267 | drive = drive->next ? drive->next : hwgroup->drive; |
1268 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1269 | goto again; | |
1da177e4 LT |
1270 | /* We clear busy, there should be no pending ATA command at this point. */ |
1271 | hwgroup->busy = 0; | |
1272 | break; | |
1273 | } | |
1274 | ||
1275 | hwgroup->rq = rq; | |
1276 | ||
1277 | /* | |
1278 | * Some systems have trouble with IDE IRQs arriving while | |
1279 | * the driver is still setting things up. So, here we disable | |
1280 | * the IRQ used by this interface while the request is being started. | |
1281 | * This may look bad at first, but pretty much the same thing | |
1282 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1283 | * -- the kernel masks the IRQ while it is being handled. | |
1284 | */ | |
1285 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1286 | disable_irq_nosync(hwif->irq); | |
1287 | spin_unlock(&ide_lock); | |
366c7f55 | 1288 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1289 | /* allow other IRQs while we start this request */ |
1290 | startstop = start_request(drive, rq); | |
1291 | spin_lock_irq(&ide_lock); | |
1292 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1293 | enable_irq(hwif->irq); | |
1294 | if (startstop == ide_stopped) | |
1295 | hwgroup->busy = 0; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Passes the stuff to ide_do_request | |
1301 | */ | |
1302 | void do_ide_request(request_queue_t *q) | |
1303 | { | |
1304 | ide_drive_t *drive = q->queuedata; | |
1305 | ||
1306 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1307 | } | |
1308 | ||
1309 | /* | |
1310 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1311 | * retry the current request in pio mode instead of risking tossing it | |
1312 | * all away | |
1313 | */ | |
1314 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1315 | { | |
1316 | ide_hwif_t *hwif = HWIF(drive); | |
1317 | struct request *rq; | |
1318 | ide_startstop_t ret = ide_stopped; | |
1319 | ||
1320 | /* | |
1321 | * end current dma transaction | |
1322 | */ | |
1323 | ||
1324 | if (error < 0) { | |
1325 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
1326 | (void)HWIF(drive)->ide_dma_end(drive); | |
1327 | ret = ide_error(drive, "dma timeout error", | |
1328 | hwif->INB(IDE_STATUS_REG)); | |
1329 | } else { | |
1330 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
1331 | (void) hwif->ide_dma_timeout(drive); | |
1332 | } | |
1333 | ||
1334 | /* | |
1335 | * disable dma for now, but remember that we did so because of | |
1336 | * a timeout -- we'll reenable after we finish this next request | |
1337 | * (or rather the first chunk of it) in pio. | |
1338 | */ | |
1339 | drive->retry_pio++; | |
1340 | drive->state = DMA_PIO_RETRY; | |
1341 | (void) hwif->ide_dma_off_quietly(drive); | |
1342 | ||
1343 | /* | |
1344 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1345 | * make sure request is sane | |
1346 | */ | |
1347 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1348 | |
1349 | if (!rq) | |
1350 | goto out; | |
1351 | ||
1da177e4 LT |
1352 | HWGROUP(drive)->rq = NULL; |
1353 | ||
1354 | rq->errors = 0; | |
1355 | ||
1356 | if (!rq->bio) | |
1357 | goto out; | |
1358 | ||
1359 | rq->sector = rq->bio->bi_sector; | |
1360 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1361 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1362 | rq->buffer = bio_data(rq->bio); | |
1363 | out: | |
1364 | return ret; | |
1365 | } | |
1366 | ||
1367 | /** | |
1368 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1369 | * @data: timer callback magic (hwgroup) | |
1370 | * | |
1371 | * An IDE command has timed out before the expected drive return | |
1372 | * occurred. At this point we attempt to clean up the current | |
1373 | * mess. If the current handler includes an expiry handler then | |
1374 | * we invoke the expiry handler, and providing it is happy the | |
1375 | * work is done. If that fails we apply generic recovery rules | |
1376 | * invoking the handler and checking the drive DMA status. We | |
1377 | * have an excessively incestuous relationship with the DMA | |
1378 | * logic that wants cleaning up. | |
1379 | */ | |
1380 | ||
1381 | void ide_timer_expiry (unsigned long data) | |
1382 | { | |
1383 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1384 | ide_handler_t *handler; | |
1385 | ide_expiry_t *expiry; | |
1386 | unsigned long flags; | |
1387 | unsigned long wait = -1; | |
1388 | ||
1389 | spin_lock_irqsave(&ide_lock, flags); | |
1390 | ||
1391 | if ((handler = hwgroup->handler) == NULL) { | |
1392 | /* | |
1393 | * Either a marginal timeout occurred | |
1394 | * (got the interrupt just as timer expired), | |
1395 | * or we were "sleeping" to give other devices a chance. | |
1396 | * Either way, we don't really want to complain about anything. | |
1397 | */ | |
1398 | if (hwgroup->sleeping) { | |
1399 | hwgroup->sleeping = 0; | |
1400 | hwgroup->busy = 0; | |
1401 | } | |
1402 | } else { | |
1403 | ide_drive_t *drive = hwgroup->drive; | |
1404 | if (!drive) { | |
1405 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1406 | hwgroup->handler = NULL; | |
1407 | } else { | |
1408 | ide_hwif_t *hwif; | |
1409 | ide_startstop_t startstop = ide_stopped; | |
1410 | if (!hwgroup->busy) { | |
1411 | hwgroup->busy = 1; /* paranoia */ | |
1412 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1413 | } | |
1414 | if ((expiry = hwgroup->expiry) != NULL) { | |
1415 | /* continue */ | |
1416 | if ((wait = expiry(drive)) > 0) { | |
1417 | /* reset timer */ | |
1418 | hwgroup->timer.expires = jiffies + wait; | |
1419 | add_timer(&hwgroup->timer); | |
1420 | spin_unlock_irqrestore(&ide_lock, flags); | |
1421 | return; | |
1422 | } | |
1423 | } | |
1424 | hwgroup->handler = NULL; | |
1425 | /* | |
1426 | * We need to simulate a real interrupt when invoking | |
1427 | * the handler() function, which means we need to | |
1428 | * globally mask the specific IRQ: | |
1429 | */ | |
1430 | spin_unlock(&ide_lock); | |
1431 | hwif = HWIF(drive); | |
1432 | #if DISABLE_IRQ_NOSYNC | |
1433 | disable_irq_nosync(hwif->irq); | |
1434 | #else | |
1435 | /* disable_irq_nosync ?? */ | |
1436 | disable_irq(hwif->irq); | |
1437 | #endif /* DISABLE_IRQ_NOSYNC */ | |
1438 | /* local CPU only, | |
1439 | * as if we were handling an interrupt */ | |
1440 | local_irq_disable(); | |
1441 | if (hwgroup->polling) { | |
1442 | startstop = handler(drive); | |
1443 | } else if (drive_is_ready(drive)) { | |
1444 | if (drive->waiting_for_dma) | |
1445 | (void) hwgroup->hwif->ide_dma_lostirq(drive); | |
1446 | (void)ide_ack_intr(hwif); | |
1447 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1448 | startstop = handler(drive); | |
1449 | } else { | |
1450 | if (drive->waiting_for_dma) { | |
1451 | startstop = ide_dma_timeout_retry(drive, wait); | |
1452 | } else | |
1453 | startstop = | |
1454 | ide_error(drive, "irq timeout", hwif->INB(IDE_STATUS_REG)); | |
1455 | } | |
1456 | drive->service_time = jiffies - drive->service_start; | |
1457 | spin_lock_irq(&ide_lock); | |
1458 | enable_irq(hwif->irq); | |
1459 | if (startstop == ide_stopped) | |
1460 | hwgroup->busy = 0; | |
1461 | } | |
1462 | } | |
1463 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1464 | spin_unlock_irqrestore(&ide_lock, flags); | |
1465 | } | |
1466 | ||
1467 | /** | |
1468 | * unexpected_intr - handle an unexpected IDE interrupt | |
1469 | * @irq: interrupt line | |
1470 | * @hwgroup: hwgroup being processed | |
1471 | * | |
1472 | * There's nothing really useful we can do with an unexpected interrupt, | |
1473 | * other than reading the status register (to clear it), and logging it. | |
1474 | * There should be no way that an irq can happen before we're ready for it, | |
1475 | * so we needn't worry much about losing an "important" interrupt here. | |
1476 | * | |
1477 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1478 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1479 | * looks "good", we just ignore the interrupt completely. | |
1480 | * | |
1481 | * This routine assumes __cli() is in effect when called. | |
1482 | * | |
1483 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1484 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1485 | * we could screw up by interfering with a new request being set up for | |
1486 | * irq15. | |
1487 | * | |
1488 | * In reality, this is a non-issue. The new command is not sent unless | |
1489 | * the drive is ready to accept one, in which case we know the drive is | |
1490 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1491 | * before completing the issuance of any new drive command, so we will not | |
1492 | * be accidentally invoked as a result of any valid command completion | |
1493 | * interrupt. | |
1494 | * | |
1495 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1496 | * is doing the current command, but we don't know which hwif burped | |
1497 | * mysteriously. | |
1498 | */ | |
1499 | ||
1500 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1501 | { | |
1502 | u8 stat; | |
1503 | ide_hwif_t *hwif = hwgroup->hwif; | |
1504 | ||
1505 | /* | |
1506 | * handle the unexpected interrupt | |
1507 | */ | |
1508 | do { | |
1509 | if (hwif->irq == irq) { | |
1510 | stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); | |
1511 | if (!OK_STAT(stat, READY_STAT, BAD_STAT)) { | |
1512 | /* Try to not flood the console with msgs */ | |
1513 | static unsigned long last_msgtime, count; | |
1514 | ++count; | |
1515 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1516 | last_msgtime = jiffies; | |
1517 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1518 | "status=0x%02x, count=%ld\n", | |
1519 | hwif->name, | |
1520 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1521 | } | |
1522 | } | |
1523 | } | |
1524 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1525 | } | |
1526 | ||
1527 | /** | |
1528 | * ide_intr - default IDE interrupt handler | |
1529 | * @irq: interrupt number | |
1530 | * @dev_id: hwif group | |
1531 | * @regs: unused weirdness from the kernel irq layer | |
1532 | * | |
1533 | * This is the default IRQ handler for the IDE layer. You should | |
1534 | * not need to override it. If you do be aware it is subtle in | |
1535 | * places | |
1536 | * | |
1537 | * hwgroup->hwif is the interface in the group currently performing | |
1538 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1539 | * the IRQ handler to call. As we issue a command the handlers | |
1540 | * step through multiple states, reassigning the handler to the | |
1541 | * next step in the process. Unlike a smart SCSI controller IDE | |
1542 | * expects the main processor to sequence the various transfer | |
1543 | * stages. We also manage a poll timer to catch up with most | |
1544 | * timeout situations. There are still a few where the handlers | |
1545 | * don't ever decide to give up. | |
1546 | * | |
1547 | * The handler eventually returns ide_stopped to indicate the | |
1548 | * request completed. At this point we issue the next request | |
1549 | * on the hwgroup and the process begins again. | |
1550 | */ | |
1551 | ||
1552 | irqreturn_t ide_intr (int irq, void *dev_id, struct pt_regs *regs) | |
1553 | { | |
1554 | unsigned long flags; | |
1555 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1556 | ide_hwif_t *hwif; | |
1557 | ide_drive_t *drive; | |
1558 | ide_handler_t *handler; | |
1559 | ide_startstop_t startstop; | |
1560 | ||
1561 | spin_lock_irqsave(&ide_lock, flags); | |
1562 | hwif = hwgroup->hwif; | |
1563 | ||
1564 | if (!ide_ack_intr(hwif)) { | |
1565 | spin_unlock_irqrestore(&ide_lock, flags); | |
1566 | return IRQ_NONE; | |
1567 | } | |
1568 | ||
1569 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1570 | /* | |
1571 | * Not expecting an interrupt from this drive. | |
1572 | * That means this could be: | |
1573 | * (1) an interrupt from another PCI device | |
1574 | * sharing the same PCI INT# as us. | |
1575 | * or (2) a drive just entered sleep or standby mode, | |
1576 | * and is interrupting to let us know. | |
1577 | * or (3) a spurious interrupt of unknown origin. | |
1578 | * | |
1579 | * For PCI, we cannot tell the difference, | |
1580 | * so in that case we just ignore it and hope it goes away. | |
1581 | * | |
1582 | * FIXME: unexpected_intr should be hwif-> then we can | |
1583 | * remove all the ifdef PCI crap | |
1584 | */ | |
1585 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1586 | if (hwif->pci_dev && !hwif->pci_dev->vendor) | |
1587 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | |
1588 | { | |
1589 | /* | |
1590 | * Probably not a shared PCI interrupt, | |
1591 | * so we can safely try to do something about it: | |
1592 | */ | |
1593 | unexpected_intr(irq, hwgroup); | |
1594 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1595 | } else { | |
1596 | /* | |
1597 | * Whack the status register, just in case | |
1598 | * we have a leftover pending IRQ. | |
1599 | */ | |
1600 | (void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); | |
1601 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | |
1602 | } | |
1603 | spin_unlock_irqrestore(&ide_lock, flags); | |
1604 | return IRQ_NONE; | |
1605 | } | |
1606 | drive = hwgroup->drive; | |
1607 | if (!drive) { | |
1608 | /* | |
1609 | * This should NEVER happen, and there isn't much | |
1610 | * we could do about it here. | |
1611 | * | |
1612 | * [Note - this can occur if the drive is hot unplugged] | |
1613 | */ | |
1614 | spin_unlock_irqrestore(&ide_lock, flags); | |
1615 | return IRQ_HANDLED; | |
1616 | } | |
1617 | if (!drive_is_ready(drive)) { | |
1618 | /* | |
1619 | * This happens regularly when we share a PCI IRQ with | |
1620 | * another device. Unfortunately, it can also happen | |
1621 | * with some buggy drives that trigger the IRQ before | |
1622 | * their status register is up to date. Hopefully we have | |
1623 | * enough advance overhead that the latter isn't a problem. | |
1624 | */ | |
1625 | spin_unlock_irqrestore(&ide_lock, flags); | |
1626 | return IRQ_NONE; | |
1627 | } | |
1628 | if (!hwgroup->busy) { | |
1629 | hwgroup->busy = 1; /* paranoia */ | |
1630 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1631 | } | |
1632 | hwgroup->handler = NULL; | |
1633 | del_timer(&hwgroup->timer); | |
1634 | spin_unlock(&ide_lock); | |
1635 | ||
1636 | if (drive->unmask) | |
366c7f55 | 1637 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1638 | /* service this interrupt, may set handler for next interrupt */ |
1639 | startstop = handler(drive); | |
1640 | spin_lock_irq(&ide_lock); | |
1641 | ||
1642 | /* | |
1643 | * Note that handler() may have set things up for another | |
1644 | * interrupt to occur soon, but it cannot happen until | |
1645 | * we exit from this routine, because it will be the | |
1646 | * same irq as is currently being serviced here, and Linux | |
1647 | * won't allow another of the same (on any CPU) until we return. | |
1648 | */ | |
1649 | drive->service_time = jiffies - drive->service_start; | |
1650 | if (startstop == ide_stopped) { | |
1651 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1652 | hwgroup->busy = 0; | |
1653 | ide_do_request(hwgroup, hwif->irq); | |
1654 | } else { | |
1655 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1656 | "on exit\n", drive->name); | |
1657 | } | |
1658 | } | |
1659 | spin_unlock_irqrestore(&ide_lock, flags); | |
1660 | return IRQ_HANDLED; | |
1661 | } | |
1662 | ||
1663 | /** | |
1664 | * ide_init_drive_cmd - initialize a drive command request | |
1665 | * @rq: request object | |
1666 | * | |
1667 | * Initialize a request before we fill it in and send it down to | |
1668 | * ide_do_drive_cmd. Commands must be set up by this function. Right | |
1669 | * now it doesn't do a lot, but if that changes abusers will have a | |
d6e05edc | 1670 | * nasty surprise. |
1da177e4 LT |
1671 | */ |
1672 | ||
1673 | void ide_init_drive_cmd (struct request *rq) | |
1674 | { | |
1675 | memset(rq, 0, sizeof(*rq)); | |
4aff5e23 | 1676 | rq->cmd_type = REQ_TYPE_ATA_CMD; |
1da177e4 LT |
1677 | rq->ref_count = 1; |
1678 | } | |
1679 | ||
1680 | EXPORT_SYMBOL(ide_init_drive_cmd); | |
1681 | ||
1682 | /** | |
1683 | * ide_do_drive_cmd - issue IDE special command | |
1684 | * @drive: device to issue command | |
1685 | * @rq: request to issue | |
1686 | * @action: action for processing | |
1687 | * | |
1688 | * This function issues a special IDE device request | |
1689 | * onto the request queue. | |
1690 | * | |
1691 | * If action is ide_wait, then the rq is queued at the end of the | |
1692 | * request queue, and the function sleeps until it has been processed. | |
1693 | * This is for use when invoked from an ioctl handler. | |
1694 | * | |
1695 | * If action is ide_preempt, then the rq is queued at the head of | |
1696 | * the request queue, displacing the currently-being-processed | |
1697 | * request and this function returns immediately without waiting | |
1698 | * for the new rq to be completed. This is VERY DANGEROUS, and is | |
1699 | * intended for careful use by the ATAPI tape/cdrom driver code. | |
1700 | * | |
1da177e4 LT |
1701 | * If action is ide_end, then the rq is queued at the end of the |
1702 | * request queue, and the function returns immediately without waiting | |
1703 | * for the new rq to be completed. This is again intended for careful | |
1704 | * use by the ATAPI tape/cdrom driver code. | |
1705 | */ | |
1706 | ||
1707 | int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action) | |
1708 | { | |
1709 | unsigned long flags; | |
1710 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
60be6b9a | 1711 | DECLARE_COMPLETION_ONSTACK(wait); |
1da177e4 LT |
1712 | int where = ELEVATOR_INSERT_BACK, err; |
1713 | int must_wait = (action == ide_wait || action == ide_head_wait); | |
1714 | ||
1715 | rq->errors = 0; | |
1da177e4 LT |
1716 | |
1717 | /* | |
1718 | * we need to hold an extra reference to request for safe inspection | |
1719 | * after completion | |
1720 | */ | |
1721 | if (must_wait) { | |
1722 | rq->ref_count++; | |
c00895ab | 1723 | rq->end_io_data = &wait; |
1da177e4 LT |
1724 | rq->end_io = blk_end_sync_rq; |
1725 | } | |
1726 | ||
1727 | spin_lock_irqsave(&ide_lock, flags); | |
1728 | if (action == ide_preempt) | |
1729 | hwgroup->rq = NULL; | |
1730 | if (action == ide_preempt || action == ide_head_wait) { | |
1731 | where = ELEVATOR_INSERT_FRONT; | |
4aff5e23 | 1732 | rq->cmd_flags |= REQ_PREEMPT; |
1da177e4 LT |
1733 | } |
1734 | __elv_add_request(drive->queue, rq, where, 0); | |
1735 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1736 | spin_unlock_irqrestore(&ide_lock, flags); | |
1737 | ||
1738 | err = 0; | |
1739 | if (must_wait) { | |
1740 | wait_for_completion(&wait); | |
1da177e4 LT |
1741 | if (rq->errors) |
1742 | err = -EIO; | |
1743 | ||
1744 | blk_put_request(rq); | |
1745 | } | |
1746 | ||
1747 | return err; | |
1748 | } | |
1749 | ||
1750 | EXPORT_SYMBOL(ide_do_drive_cmd); |