Commit | Line | Data |
---|---|---|
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> | |
3ceca727 | 43 | #include <linux/hdreg.h> |
1da177e4 LT |
44 | #include <linux/completion.h> |
45 | #include <linux/reboot.h> | |
46 | #include <linux/cdrom.h> | |
47 | #include <linux/seq_file.h> | |
48 | #include <linux/device.h> | |
49 | #include <linux/kmod.h> | |
50 | #include <linux/scatterlist.h> | |
1977f032 | 51 | #include <linux/bitops.h> |
1da177e4 LT |
52 | |
53 | #include <asm/byteorder.h> | |
54 | #include <asm/irq.h> | |
55 | #include <asm/uaccess.h> | |
56 | #include <asm/io.h> | |
1da177e4 | 57 | |
a7ff7d41 | 58 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
bbc615b1 | 59 | int uptodate, unsigned int nr_bytes, int dequeue) |
1da177e4 LT |
60 | { |
61 | int ret = 1; | |
5e36bb6e KU |
62 | int error = 0; |
63 | ||
64 | if (uptodate <= 0) | |
65 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* |
68 | * if failfast is set on a request, override number of sectors and | |
69 | * complete the whole request right now | |
70 | */ | |
5e36bb6e | 71 | if (blk_noretry_request(rq) && error) |
41e9d344 | 72 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 73 | |
5e36bb6e | 74 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
75 | rq->errors = -EIO; |
76 | ||
77 | /* | |
78 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
79 | * if we DMA timeout more than 3 times, just stay in PIO | |
80 | */ | |
c3922048 BZ |
81 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
82 | drive->retry_pio <= 3) { | |
83 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 84 | ide_dma_on(drive); |
1da177e4 LT |
85 | } |
86 | ||
5e36bb6e KU |
87 | if (!__blk_end_request(rq, error, nr_bytes)) { |
88 | if (dequeue) | |
bbc615b1 | 89 | HWGROUP(drive)->rq = NULL; |
1da177e4 LT |
90 | ret = 0; |
91 | } | |
8672d571 | 92 | |
1da177e4 LT |
93 | return ret; |
94 | } | |
1da177e4 LT |
95 | |
96 | /** | |
97 | * ide_end_request - complete an IDE I/O | |
98 | * @drive: IDE device for the I/O | |
99 | * @uptodate: | |
100 | * @nr_sectors: number of sectors completed | |
101 | * | |
102 | * This is our end_request wrapper function. We complete the I/O | |
103 | * update random number input and dequeue the request, which if | |
104 | * it was tagged may be out of order. | |
105 | */ | |
106 | ||
107 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
108 | { | |
41e9d344 | 109 | unsigned int nr_bytes = nr_sectors << 9; |
1da177e4 LT |
110 | struct request *rq; |
111 | unsigned long flags; | |
112 | int ret = 1; | |
113 | ||
8672d571 JA |
114 | /* |
115 | * room for locking improvements here, the calls below don't | |
116 | * need the queue lock held at all | |
117 | */ | |
1da177e4 LT |
118 | spin_lock_irqsave(&ide_lock, flags); |
119 | rq = HWGROUP(drive)->rq; | |
120 | ||
41e9d344 JA |
121 | if (!nr_bytes) { |
122 | if (blk_pc_request(rq)) | |
123 | nr_bytes = rq->data_len; | |
124 | else | |
125 | nr_bytes = rq->hard_cur_sectors << 9; | |
126 | } | |
1da177e4 | 127 | |
bbc615b1 | 128 | ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
129 | |
130 | spin_unlock_irqrestore(&ide_lock, flags); | |
131 | return ret; | |
132 | } | |
133 | EXPORT_SYMBOL(ide_end_request); | |
134 | ||
135 | /* | |
136 | * Power Management state machine. This one is rather trivial for now, | |
137 | * we should probably add more, like switching back to PIO on suspend | |
138 | * to help some BIOSes, re-do the door locking on resume, etc... | |
139 | */ | |
140 | ||
141 | enum { | |
142 | ide_pm_flush_cache = ide_pm_state_start_suspend, | |
143 | idedisk_pm_standby, | |
144 | ||
8c2c0118 JL |
145 | idedisk_pm_restore_pio = ide_pm_state_start_resume, |
146 | idedisk_pm_idle, | |
1da177e4 LT |
147 | ide_pm_restore_dma, |
148 | }; | |
149 | ||
150 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) | |
151 | { | |
c00895ab | 152 | struct request_pm_state *pm = rq->data; |
ad3cadda | 153 | |
1da177e4 LT |
154 | if (drive->media != ide_disk) |
155 | return; | |
156 | ||
ad3cadda | 157 | switch (pm->pm_step) { |
1da177e4 | 158 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */ |
ad3cadda JA |
159 | if (pm->pm_state == PM_EVENT_FREEZE) |
160 | pm->pm_step = ide_pm_state_completed; | |
1da177e4 | 161 | else |
ad3cadda | 162 | pm->pm_step = idedisk_pm_standby; |
1da177e4 LT |
163 | break; |
164 | case idedisk_pm_standby: /* Suspend step 2 (standby) complete */ | |
ad3cadda | 165 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 166 | break; |
8c2c0118 JL |
167 | case idedisk_pm_restore_pio: /* Resume step 1 complete */ |
168 | pm->pm_step = idedisk_pm_idle; | |
169 | break; | |
170 | case idedisk_pm_idle: /* Resume step 2 (idle) complete */ | |
ad3cadda | 171 | pm->pm_step = ide_pm_restore_dma; |
1da177e4 LT |
172 | break; |
173 | } | |
174 | } | |
175 | ||
176 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
177 | { | |
c00895ab | 178 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
179 | ide_task_t *args = rq->special; |
180 | ||
181 | memset(args, 0, sizeof(*args)); | |
182 | ||
ad3cadda | 183 | switch (pm->pm_step) { |
1da177e4 LT |
184 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */ |
185 | if (drive->media != ide_disk) | |
186 | break; | |
187 | /* Not supported? Switch to next step now. */ | |
97100fc8 BZ |
188 | if (ata_id_flush_enabled(drive->id) == 0 || |
189 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { | |
1da177e4 LT |
190 | ide_complete_power_step(drive, rq, 0, 0); |
191 | return ide_stopped; | |
192 | } | |
ff2779b5 | 193 | if (ata_id_flush_ext_enabled(drive->id)) |
aaaade3f | 194 | args->tf.command = ATA_CMD_FLUSH_EXT; |
1da177e4 | 195 | else |
aaaade3f | 196 | args->tf.command = ATA_CMD_FLUSH; |
74095a91 | 197 | goto out_do_tf; |
1da177e4 LT |
198 | |
199 | case idedisk_pm_standby: /* Suspend step 2 (standby) */ | |
aaaade3f | 200 | args->tf.command = ATA_CMD_STANDBYNOW1; |
74095a91 | 201 | goto out_do_tf; |
1da177e4 | 202 | |
8c2c0118 | 203 | case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */ |
26bcb879 | 204 | ide_set_max_pio(drive); |
317a46a2 BZ |
205 | /* |
206 | * skip idedisk_pm_idle for ATAPI devices | |
207 | */ | |
208 | if (drive->media != ide_disk) | |
209 | pm->pm_step = ide_pm_restore_dma; | |
210 | else | |
211 | ide_complete_power_step(drive, rq, 0, 0); | |
8c2c0118 JL |
212 | return ide_stopped; |
213 | ||
214 | case idedisk_pm_idle: /* Resume step 2 (idle) */ | |
aaaade3f | 215 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
74095a91 | 216 | goto out_do_tf; |
1da177e4 | 217 | |
8c2c0118 | 218 | case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */ |
1da177e4 | 219 | /* |
0ae2e178 | 220 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
221 | * we could be smarter and check for current xfer_speed |
222 | * in struct drive etc... | |
223 | */ | |
5e37bdc0 | 224 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 225 | break; |
8987d21b | 226 | /* |
97100fc8 | 227 | * TODO: respect IDE_DFLAG_USING_DMA |
8987d21b | 228 | */ |
3608b5d7 | 229 | ide_set_dma(drive); |
1da177e4 LT |
230 | break; |
231 | } | |
ad3cadda | 232 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 233 | return ide_stopped; |
74095a91 BZ |
234 | |
235 | out_do_tf: | |
657cc1a8 | 236 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 237 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 238 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
239 | } |
240 | ||
dbe217af AC |
241 | /** |
242 | * ide_end_dequeued_request - complete an IDE I/O | |
243 | * @drive: IDE device for the I/O | |
244 | * @uptodate: | |
245 | * @nr_sectors: number of sectors completed | |
246 | * | |
247 | * Complete an I/O that is no longer on the request queue. This | |
248 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
249 | * We must still finish the old request but we must not tamper with the | |
250 | * queue in the meantime. | |
251 | * | |
252 | * NOTE: This path does not handle barrier, but barrier is not supported | |
253 | * on ide-cd anyway. | |
254 | */ | |
255 | ||
256 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
257 | int uptodate, int nr_sectors) | |
258 | { | |
259 | unsigned long flags; | |
bbc615b1 | 260 | int ret; |
dbe217af AC |
261 | |
262 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 263 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 264 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 265 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 266 | |
dbe217af AC |
267 | return ret; |
268 | } | |
269 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
270 | ||
271 | ||
1da177e4 LT |
272 | /** |
273 | * ide_complete_pm_request - end the current Power Management request | |
274 | * @drive: target drive | |
275 | * @rq: request | |
276 | * | |
277 | * This function cleans up the current PM request and stops the queue | |
278 | * if necessary. | |
279 | */ | |
280 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
281 | { | |
282 | unsigned long flags; | |
283 | ||
284 | #ifdef DEBUG_PM | |
285 | printk("%s: completing PM request, %s\n", drive->name, | |
286 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
287 | #endif | |
288 | spin_lock_irqsave(&ide_lock, flags); | |
289 | if (blk_pm_suspend_request(rq)) { | |
290 | blk_stop_queue(drive->queue); | |
291 | } else { | |
97100fc8 | 292 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
1da177e4 LT |
293 | blk_start_queue(drive->queue); |
294 | } | |
1da177e4 | 295 | HWGROUP(drive)->rq = NULL; |
5e36bb6e KU |
296 | if (__blk_end_request(rq, 0, 0)) |
297 | BUG(); | |
1da177e4 LT |
298 | spin_unlock_irqrestore(&ide_lock, flags); |
299 | } | |
300 | ||
1da177e4 LT |
301 | /** |
302 | * ide_end_drive_cmd - end an explicit drive command | |
303 | * @drive: command | |
304 | * @stat: status bits | |
305 | * @err: error bits | |
306 | * | |
307 | * Clean up after success/failure of an explicit drive command. | |
308 | * These get thrown onto the queue so they are synchronized with | |
309 | * real I/O operations on the drive. | |
310 | * | |
311 | * In LBA48 mode we have to read the register set twice to get | |
312 | * all the extra information out. | |
313 | */ | |
314 | ||
315 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
316 | { | |
1da177e4 LT |
317 | unsigned long flags; |
318 | struct request *rq; | |
319 | ||
320 | spin_lock_irqsave(&ide_lock, flags); | |
321 | rq = HWGROUP(drive)->rq; | |
322 | spin_unlock_irqrestore(&ide_lock, flags); | |
323 | ||
7267c337 | 324 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
325 | ide_task_t *task = (ide_task_t *)rq->special; |
326 | ||
1da177e4 | 327 | if (rq->errors == 0) |
3a7d2484 | 328 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
395d8ef5 BZ |
329 | |
330 | if (task) { | |
331 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 332 | |
650d841d | 333 | tf->error = err; |
650d841d | 334 | tf->status = stat; |
1da177e4 | 335 | |
374e042c | 336 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
337 | |
338 | if (task->tf_flags & IDE_TFLAG_DYN) | |
339 | kfree(task); | |
1da177e4 LT |
340 | } |
341 | } else if (blk_pm_request(rq)) { | |
c00895ab | 342 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
343 | #ifdef DEBUG_PM |
344 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
345 | drive->name, rq->pm->pm_step, stat, err); | |
346 | #endif | |
347 | ide_complete_power_step(drive, rq, stat, err); | |
ad3cadda | 348 | if (pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
349 | ide_complete_pm_request(drive, rq); |
350 | return; | |
351 | } | |
352 | ||
353 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
354 | HWGROUP(drive)->rq = NULL; |
355 | rq->errors = err; | |
3b0e044d KU |
356 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
357 | blk_rq_bytes(rq)))) | |
5e36bb6e | 358 | BUG(); |
1da177e4 LT |
359 | spin_unlock_irqrestore(&ide_lock, flags); |
360 | } | |
361 | ||
362 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
363 | ||
1da177e4 LT |
364 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
365 | { | |
366 | if (rq->rq_disk) { | |
367 | ide_driver_t *drv; | |
368 | ||
369 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
370 | drv->end_request(drive, 0, 0); | |
371 | } else | |
372 | ide_end_request(drive, 0, 0); | |
373 | } | |
374 | ||
375 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
376 | { | |
377 | ide_hwif_t *hwif = drive->hwif; | |
378 | ||
97100fc8 BZ |
379 | if ((stat & ATA_BUSY) || |
380 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
381 | /* other bits are useless when BUSY */ |
382 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 383 | } else if (stat & ATA_ERR) { |
1da177e4 | 384 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 385 | if (err == ATA_ABORTED) { |
d1d76714 | 386 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
387 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
388 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
389 | return ide_stopped; |
390 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
391 | /* UDMA crc error, just retry the operation */ | |
392 | drive->crc_count++; | |
3a7d2484 | 393 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
394 | /* retries won't help these */ |
395 | rq->errors = ERROR_MAX; | |
3a7d2484 | 396 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
397 | /* help it find track zero */ |
398 | rq->errors |= ERROR_RECAL; | |
399 | } | |
400 | } | |
401 | ||
3a7d2484 | 402 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
403 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
404 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
405 | ||
406 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
407 | } | |
1da177e4 | 408 | |
513daadd SS |
409 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
410 | ide_kill_rq(drive, rq); | |
411 | return ide_stopped; | |
412 | } | |
413 | ||
3a7d2484 | 414 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 415 | rq->errors |= ERROR_RESET; |
1da177e4 | 416 | |
513daadd | 417 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 418 | ++rq->errors; |
513daadd | 419 | return ide_do_reset(drive); |
1da177e4 | 420 | } |
513daadd SS |
421 | |
422 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
423 | drive->special.b.recalibrate = 1; | |
424 | ||
425 | ++rq->errors; | |
426 | ||
1da177e4 LT |
427 | return ide_stopped; |
428 | } | |
429 | ||
430 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
431 | { | |
432 | ide_hwif_t *hwif = drive->hwif; | |
433 | ||
97100fc8 BZ |
434 | if ((stat & ATA_BUSY) || |
435 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
436 | /* other bits are useless when BUSY */ |
437 | rq->errors |= ERROR_RESET; | |
438 | } else { | |
439 | /* add decoding error stuff */ | |
440 | } | |
441 | ||
3a7d2484 | 442 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 443 | /* force an abort */ |
aaaade3f | 444 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
445 | |
446 | if (rq->errors >= ERROR_MAX) { | |
447 | ide_kill_rq(drive, rq); | |
448 | } else { | |
449 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
450 | ++rq->errors; | |
451 | return ide_do_reset(drive); | |
452 | } | |
453 | ++rq->errors; | |
454 | } | |
455 | ||
456 | return ide_stopped; | |
457 | } | |
458 | ||
459 | ide_startstop_t | |
460 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
461 | { | |
462 | if (drive->media == ide_disk) | |
463 | return ide_ata_error(drive, rq, stat, err); | |
464 | return ide_atapi_error(drive, rq, stat, err); | |
465 | } | |
466 | ||
467 | EXPORT_SYMBOL_GPL(__ide_error); | |
468 | ||
469 | /** | |
470 | * ide_error - handle an error on the IDE | |
471 | * @drive: drive the error occurred on | |
472 | * @msg: message to report | |
473 | * @stat: status bits | |
474 | * | |
475 | * ide_error() takes action based on the error returned by the drive. | |
476 | * For normal I/O that may well include retries. We deal with | |
477 | * both new-style (taskfile) and old style command handling here. | |
478 | * In the case of taskfile command handling there is work left to | |
479 | * do | |
480 | */ | |
481 | ||
482 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
483 | { | |
484 | struct request *rq; | |
485 | u8 err; | |
486 | ||
487 | err = ide_dump_status(drive, msg, stat); | |
488 | ||
489 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
490 | return ide_stopped; | |
491 | ||
492 | /* retry only "normal" I/O: */ | |
4aff5e23 | 493 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
494 | rq->errors = 1; |
495 | ide_end_drive_cmd(drive, stat, err); | |
496 | return ide_stopped; | |
497 | } | |
498 | ||
499 | if (rq->rq_disk) { | |
500 | ide_driver_t *drv; | |
501 | ||
502 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
503 | return drv->error(drive, rq, stat, err); | |
504 | } else | |
505 | return __ide_error(drive, rq, stat, err); | |
506 | } | |
507 | ||
508 | EXPORT_SYMBOL_GPL(ide_error); | |
509 | ||
57d7366b | 510 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 511 | { |
57d7366b BZ |
512 | tf->nsect = drive->sect; |
513 | tf->lbal = drive->sect; | |
514 | tf->lbam = drive->cyl; | |
515 | tf->lbah = drive->cyl >> 8; | |
d1d76714 | 516 | tf->device = (drive->head - 1) | drive->select.all; |
aaaade3f | 517 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
518 | } |
519 | ||
57d7366b | 520 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 521 | { |
57d7366b | 522 | tf->nsect = drive->sect; |
aaaade3f | 523 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
524 | } |
525 | ||
57d7366b | 526 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 527 | { |
57d7366b | 528 | tf->nsect = drive->mult_req; |
aaaade3f | 529 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
530 | } |
531 | ||
532 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
533 | { | |
534 | special_t *s = &drive->special; | |
535 | ide_task_t args; | |
536 | ||
537 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 538 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
539 | |
540 | if (s->b.set_geometry) { | |
541 | s->b.set_geometry = 0; | |
57d7366b | 542 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
543 | } else if (s->b.recalibrate) { |
544 | s->b.recalibrate = 0; | |
57d7366b | 545 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
546 | } else if (s->b.set_multmode) { |
547 | s->b.set_multmode = 0; | |
57d7366b | 548 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
549 | } else if (s->all) { |
550 | int special = s->all; | |
551 | s->all = 0; | |
552 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
553 | return ide_stopped; | |
554 | } | |
555 | ||
657cc1a8 | 556 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 557 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 558 | |
1da177e4 LT |
559 | do_rw_taskfile(drive, &args); |
560 | ||
561 | return ide_started; | |
562 | } | |
563 | ||
26bcb879 BZ |
564 | /* |
565 | * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away | |
566 | */ | |
567 | static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) | |
568 | { | |
569 | switch (req_pio) { | |
570 | case 202: | |
571 | case 201: | |
572 | case 200: | |
573 | case 102: | |
574 | case 101: | |
575 | case 100: | |
576 | return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; | |
577 | case 9: | |
578 | case 8: | |
579 | return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; | |
580 | case 7: | |
581 | case 6: | |
582 | return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; | |
583 | default: | |
584 | return 0; | |
585 | } | |
586 | } | |
587 | ||
1da177e4 LT |
588 | /** |
589 | * do_special - issue some special commands | |
590 | * @drive: drive the command is for | |
591 | * | |
aaaade3f BZ |
592 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
593 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
594 | * | |
595 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
596 | */ |
597 | ||
598 | static ide_startstop_t do_special (ide_drive_t *drive) | |
599 | { | |
600 | special_t *s = &drive->special; | |
601 | ||
602 | #ifdef DEBUG | |
603 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
604 | #endif | |
605 | if (s->b.set_tune) { | |
26bcb879 | 606 | ide_hwif_t *hwif = drive->hwif; |
ac95beed | 607 | const struct ide_port_ops *port_ops = hwif->port_ops; |
26bcb879 BZ |
608 | u8 req_pio = drive->tune_req; |
609 | ||
1da177e4 | 610 | s->b.set_tune = 0; |
26bcb879 BZ |
611 | |
612 | if (set_pio_mode_abuse(drive->hwif, req_pio)) { | |
d393aa03 | 613 | /* |
97100fc8 | 614 | * take ide_lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT |
d393aa03 BZ |
615 | */ |
616 | if (req_pio == 8 || req_pio == 9) { | |
617 | unsigned long flags; | |
618 | ||
619 | spin_lock_irqsave(&ide_lock, flags); | |
ac95beed | 620 | port_ops->set_pio_mode(drive, req_pio); |
d393aa03 BZ |
621 | spin_unlock_irqrestore(&ide_lock, flags); |
622 | } else | |
ac95beed | 623 | port_ops->set_pio_mode(drive, req_pio); |
aedea591 | 624 | } else { |
97100fc8 BZ |
625 | int keep_dma = |
626 | !!(drive->dev_flags & IDE_DFLAG_USING_DMA); | |
aedea591 | 627 | |
26bcb879 BZ |
628 | ide_set_pio(drive, req_pio); |
629 | ||
aedea591 BZ |
630 | if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { |
631 | if (keep_dma) | |
4a546e04 | 632 | ide_dma_on(drive); |
aedea591 BZ |
633 | } |
634 | } | |
635 | ||
1da177e4 LT |
636 | return ide_stopped; |
637 | } else { | |
638 | if (drive->media == ide_disk) | |
639 | return ide_disk_special(drive); | |
640 | ||
641 | s->all = 0; | |
642 | drive->mult_req = 0; | |
643 | return ide_stopped; | |
644 | } | |
645 | } | |
646 | ||
647 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
648 | { | |
649 | ide_hwif_t *hwif = drive->hwif; | |
650 | struct scatterlist *sg = hwif->sg_table; | |
651 | ||
652 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
653 | return; | |
654 | ||
4aff5e23 | 655 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
656 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
657 | } else { | |
658 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
659 | hwif->sg_nents = 1; | |
660 | } | |
661 | } | |
662 | ||
663 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
664 | ||
665 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
666 | { | |
667 | ide_hwif_t *hwif = drive->hwif; | |
668 | ||
669 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
670 | hwif->cursg_ofs = 0; |
671 | hwif->cursg = NULL; | |
1da177e4 LT |
672 | } |
673 | ||
674 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
675 | ||
676 | /** | |
677 | * execute_drive_command - issue special drive command | |
338cec32 | 678 | * @drive: the drive to issue the command on |
1da177e4 LT |
679 | * @rq: the request structure holding the command |
680 | * | |
681 | * execute_drive_cmd() issues a special drive command, usually | |
682 | * initiated by ioctl() from the external hdparm program. The | |
683 | * command can be a drive command, drive task or taskfile | |
684 | * operation. Weirdly you can call it with NULL to wait for | |
685 | * all commands to finish. Don't do this as that is due to change | |
686 | */ | |
687 | ||
688 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
689 | struct request *rq) | |
690 | { | |
691 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 692 | ide_task_t *task = rq->special; |
1da177e4 | 693 | |
7267c337 | 694 | if (task) { |
21d535c9 | 695 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
696 | |
697 | switch (hwif->data_phase) { | |
698 | case TASKFILE_MULTI_OUT: | |
699 | case TASKFILE_OUT: | |
700 | case TASKFILE_MULTI_IN: | |
701 | case TASKFILE_IN: | |
702 | ide_init_sg_cmd(drive, rq); | |
703 | ide_map_sg(drive, rq); | |
704 | default: | |
705 | break; | |
706 | } | |
74095a91 | 707 | |
21d535c9 BZ |
708 | return do_rw_taskfile(drive, task); |
709 | } | |
710 | ||
1da177e4 LT |
711 | /* |
712 | * NULL is actually a valid way of waiting for | |
713 | * all current requests to be flushed from the queue. | |
714 | */ | |
715 | #ifdef DEBUG | |
716 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
717 | #endif | |
374e042c | 718 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 719 | ide_read_error(drive)); |
64a57fe4 | 720 | |
1da177e4 LT |
721 | return ide_stopped; |
722 | } | |
723 | ||
92f1f8fd EO |
724 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
725 | int arg) | |
726 | { | |
727 | struct request_queue *q = drive->queue; | |
728 | struct request *rq; | |
729 | int ret = 0; | |
730 | ||
731 | if (!(setting->flags & DS_SYNC)) | |
732 | return setting->set(drive, arg); | |
733 | ||
734 | rq = blk_get_request(q, READ, GFP_KERNEL); | |
735 | if (!rq) | |
736 | return -ENOMEM; | |
737 | ||
738 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
739 | rq->cmd_len = 5; | |
740 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
741 | *(int *)&rq->cmd[1] = arg; | |
742 | rq->special = setting->set; | |
743 | ||
744 | if (blk_execute_rq(q, NULL, rq, 0)) | |
745 | ret = rq->errors; | |
746 | blk_put_request(rq); | |
747 | ||
748 | return ret; | |
749 | } | |
750 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
751 | ||
79e36a9f EO |
752 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
753 | { | |
754 | switch (rq->cmd[0]) { | |
92f1f8fd EO |
755 | case REQ_DEVSET_EXEC: |
756 | { | |
757 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
758 | ||
759 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
760 | if (err) | |
761 | rq->errors = err; | |
762 | else | |
763 | err = 1; | |
764 | ide_end_request(drive, err, 0); | |
765 | return ide_stopped; | |
766 | } | |
79e36a9f EO |
767 | case REQ_DRIVE_RESET: |
768 | return ide_do_reset(drive); | |
769 | default: | |
770 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
771 | ide_end_request(drive, 0, 0); | |
772 | return ide_stopped; | |
773 | } | |
774 | } | |
775 | ||
ad3cadda JA |
776 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
777 | { | |
c00895ab | 778 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
779 | |
780 | if (blk_pm_suspend_request(rq) && | |
781 | pm->pm_step == ide_pm_state_start_suspend) | |
782 | /* Mark drive blocked when starting the suspend sequence. */ | |
97100fc8 | 783 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
ad3cadda JA |
784 | else if (blk_pm_resume_request(rq) && |
785 | pm->pm_step == ide_pm_state_start_resume) { | |
786 | /* | |
787 | * The first thing we do on wakeup is to wait for BSY bit to | |
788 | * go away (with a looong timeout) as a drive on this hwif may | |
789 | * just be POSTing itself. | |
790 | * We do that before even selecting as the "other" device on | |
791 | * the bus may be broken enough to walk on our toes at this | |
792 | * point. | |
793 | */ | |
6e6afb3b | 794 | ide_hwif_t *hwif = drive->hwif; |
ad3cadda JA |
795 | int rc; |
796 | #ifdef DEBUG_PM | |
797 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
798 | #endif | |
6e6afb3b | 799 | rc = ide_wait_not_busy(hwif, 35000); |
ad3cadda JA |
800 | if (rc) |
801 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
802 | SELECT_DRIVE(drive); | |
374e042c | 803 | hwif->tp_ops->set_irq(hwif, 1); |
6e6afb3b | 804 | rc = ide_wait_not_busy(hwif, 100000); |
ad3cadda JA |
805 | if (rc) |
806 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
807 | } | |
808 | } | |
809 | ||
1da177e4 LT |
810 | /** |
811 | * start_request - start of I/O and command issuing for IDE | |
812 | * | |
813 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 814 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
815 | * |
816 | * FIXME: this function needs a rename | |
817 | */ | |
818 | ||
819 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
820 | { | |
821 | ide_startstop_t startstop; | |
1da177e4 | 822 | |
4aff5e23 | 823 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
824 | |
825 | #ifdef DEBUG | |
826 | printk("%s: start_request: current=0x%08lx\n", | |
827 | HWIF(drive)->name, (unsigned long) rq); | |
828 | #endif | |
829 | ||
830 | /* bail early if we've exceeded max_failures */ | |
831 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 832 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
833 | goto kill_rq; |
834 | } | |
835 | ||
ad3cadda JA |
836 | if (blk_pm_request(rq)) |
837 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
838 | |
839 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
840 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
841 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
842 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
843 | return startstop; | |
844 | } | |
845 | if (!drive->special.all) { | |
846 | ide_driver_t *drv; | |
847 | ||
513daadd SS |
848 | /* |
849 | * We reset the drive so we need to issue a SETFEATURES. | |
850 | * Do it _after_ do_special() restored device parameters. | |
851 | */ | |
852 | if (drive->current_speed == 0xff) | |
853 | ide_config_drive_speed(drive, drive->desired_speed); | |
854 | ||
7267c337 | 855 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
856 | return execute_drive_cmd(drive, rq); |
857 | else if (blk_pm_request(rq)) { | |
c00895ab | 858 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
859 | #ifdef DEBUG_PM |
860 | printk("%s: start_power_step(step: %d)\n", | |
861 | drive->name, rq->pm->pm_step); | |
862 | #endif | |
863 | startstop = ide_start_power_step(drive, rq); | |
864 | if (startstop == ide_stopped && | |
ad3cadda | 865 | pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
866 | ide_complete_pm_request(drive, rq); |
867 | return startstop; | |
79e36a9f EO |
868 | } else if (!rq->rq_disk && blk_special_request(rq)) |
869 | /* | |
870 | * TODO: Once all ULDs have been modified to | |
871 | * check for specific op codes rather than | |
872 | * blindly accepting any special request, the | |
873 | * check for ->rq_disk above may be replaced | |
874 | * by a more suitable mechanism or even | |
875 | * dropped entirely. | |
876 | */ | |
877 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
878 | |
879 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
880 | |
881 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
882 | } |
883 | return do_special(drive); | |
884 | kill_rq: | |
885 | ide_kill_rq(drive, rq); | |
886 | return ide_stopped; | |
887 | } | |
888 | ||
889 | /** | |
890 | * ide_stall_queue - pause an IDE device | |
891 | * @drive: drive to stall | |
892 | * @timeout: time to stall for (jiffies) | |
893 | * | |
894 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
895 | * to the hwgroup by sleeping for timeout jiffies. | |
896 | */ | |
897 | ||
898 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
899 | { | |
900 | if (timeout > WAIT_WORSTCASE) | |
901 | timeout = WAIT_WORSTCASE; | |
902 | drive->sleep = timeout + jiffies; | |
97100fc8 | 903 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 LT |
904 | } |
905 | ||
906 | EXPORT_SYMBOL(ide_stall_queue); | |
907 | ||
908 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
909 | ||
910 | /** | |
911 | * choose_drive - select a drive to service | |
912 | * @hwgroup: hardware group to select on | |
913 | * | |
914 | * choose_drive() selects the next drive which will be serviced. | |
915 | * This is necessary because the IDE layer can't issue commands | |
916 | * to both drives on the same cable, unlike SCSI. | |
917 | */ | |
918 | ||
919 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
920 | { | |
921 | ide_drive_t *drive, *best; | |
922 | ||
923 | repeat: | |
924 | best = NULL; | |
925 | drive = hwgroup->drive; | |
926 | ||
927 | /* | |
928 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
929 | * though that is 3 requests, it must be seen as a single transaction. | |
930 | * we must not preempt this drive until that is complete | |
931 | */ | |
932 | if (blk_queue_flushing(drive->queue)) { | |
933 | /* | |
934 | * small race where queue could get replugged during | |
935 | * the 3-request flush cycle, just yank the plug since | |
936 | * we want it to finish asap | |
937 | */ | |
938 | blk_remove_plug(drive->queue); | |
939 | return drive; | |
940 | } | |
941 | ||
942 | do { | |
97100fc8 BZ |
943 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
944 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); | |
945 | ||
946 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && | |
947 | !elv_queue_empty(drive->queue)) { | |
948 | if (best == NULL || | |
949 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || | |
950 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { | |
1da177e4 LT |
951 | if (!blk_queue_plugged(drive->queue)) |
952 | best = drive; | |
953 | } | |
954 | } | |
955 | } while ((drive = drive->next) != hwgroup->drive); | |
97100fc8 BZ |
956 | |
957 | if (best && (best->dev_flags & IDE_DFLAG_NICE1) && | |
958 | (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 && | |
959 | best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1da177e4 LT |
960 | long t = (signed long)(WAKEUP(best) - jiffies); |
961 | if (t >= WAIT_MIN_SLEEP) { | |
962 | /* | |
963 | * We *may* have some time to spare, but first let's see if | |
964 | * someone can potentially benefit from our nice mood today.. | |
965 | */ | |
966 | drive = best->next; | |
967 | do { | |
97100fc8 | 968 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
1da177e4 LT |
969 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
970 | && time_before(WAKEUP(drive), jiffies + t)) | |
971 | { | |
972 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
973 | goto repeat; | |
974 | } | |
975 | } while ((drive = drive->next) != best); | |
976 | } | |
977 | } | |
978 | return best; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Issue a new request to a drive from hwgroup | |
983 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
984 | * | |
985 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
986 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
987 | * may have both interfaces in a single hwgroup to "serialize" access. | |
988 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
989 | * together into one hwgroup for serialized access. | |
990 | * | |
991 | * Note also that several hwgroups can end up sharing a single IRQ, | |
992 | * possibly along with many other devices. This is especially common in | |
993 | * PCI-based systems with off-board IDE controller cards. | |
994 | * | |
995 | * The IDE driver uses the single global ide_lock spinlock to protect | |
996 | * access to the request queues, and to protect the hwgroup->busy flag. | |
997 | * | |
998 | * The first thread into the driver for a particular hwgroup sets the | |
999 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
1000 | * and then initiates processing of the top request from the request queue. | |
1001 | * | |
1002 | * Other threads attempting entry notice the busy setting, and will simply | |
1003 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
1004 | * remains set even when the driver is merely awaiting the next interrupt. | |
1005 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
1006 | * | |
1007 | * When processing of a request completes, the completing thread or IRQ-handler | |
1008 | * will start the next request from the queue. If no more work remains, | |
1009 | * the driver will clear the hwgroup->busy flag and exit. | |
1010 | * | |
1011 | * The ide_lock (spinlock) is used to protect all access to the | |
1012 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
1013 | * the driver. This makes the driver much more friendlier to shared IRQs | |
1014 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
1015 | */ | |
1016 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
1017 | { | |
1018 | ide_drive_t *drive; | |
1019 | ide_hwif_t *hwif; | |
1020 | struct request *rq; | |
1021 | ide_startstop_t startstop; | |
867f8b4e | 1022 | int loops = 0; |
1da177e4 LT |
1023 | |
1024 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
1025 | ide_get_lock(ide_intr, hwgroup); | |
1026 | ||
1027 | /* caller must own ide_lock */ | |
1028 | BUG_ON(!irqs_disabled()); | |
1029 | ||
1030 | while (!hwgroup->busy) { | |
1031 | hwgroup->busy = 1; | |
1032 | drive = choose_drive(hwgroup); | |
1033 | if (drive == NULL) { | |
1034 | int sleeping = 0; | |
1035 | unsigned long sleep = 0; /* shut up, gcc */ | |
1036 | hwgroup->rq = NULL; | |
1037 | drive = hwgroup->drive; | |
1038 | do { | |
97100fc8 BZ |
1039 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
1040 | (sleeping == 0 || | |
1041 | time_before(drive->sleep, sleep))) { | |
1da177e4 LT |
1042 | sleeping = 1; |
1043 | sleep = drive->sleep; | |
1044 | } | |
1045 | } while ((drive = drive->next) != hwgroup->drive); | |
1046 | if (sleeping) { | |
1047 | /* | |
1048 | * Take a short snooze, and then wake up this hwgroup again. | |
1049 | * This gives other hwgroups on the same a chance to | |
1050 | * play fairly with us, just in case there are big differences | |
1051 | * in relative throughputs.. don't want to hog the cpu too much. | |
1052 | */ | |
1053 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1054 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1055 | #if 1 | |
1056 | if (timer_pending(&hwgroup->timer)) | |
1057 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1058 | #endif | |
1059 | /* so that ide_timer_expiry knows what to do */ | |
1060 | hwgroup->sleeping = 1; | |
23450319 | 1061 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1062 | mod_timer(&hwgroup->timer, sleep); |
1063 | /* we purposely leave hwgroup->busy==1 | |
1064 | * while sleeping */ | |
1065 | } else { | |
1066 | /* Ugly, but how can we sleep for the lock | |
1067 | * otherwise? perhaps from tq_disk? | |
1068 | */ | |
1069 | ||
1070 | /* for atari only */ | |
1071 | ide_release_lock(); | |
1072 | hwgroup->busy = 0; | |
1073 | } | |
1074 | ||
1075 | /* no more work for this hwgroup (for now) */ | |
1076 | return; | |
1077 | } | |
867f8b4e | 1078 | again: |
1da177e4 | 1079 | hwif = HWIF(drive); |
81ca6919 | 1080 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1081 | /* |
1082 | * set nIEN for previous hwif, drives in the | |
1083 | * quirk_list may not like intr setups/cleanups | |
1084 | */ | |
1085 | if (drive->quirk_list != 1) | |
374e042c | 1086 | hwif->tp_ops->set_irq(hwif, 0); |
1da177e4 LT |
1087 | } |
1088 | hwgroup->hwif = hwif; | |
1089 | hwgroup->drive = drive; | |
97100fc8 | 1090 | drive->dev_flags &= ~IDE_DFLAG_SLEEPING; |
1da177e4 LT |
1091 | drive->service_start = jiffies; |
1092 | ||
1093 | if (blk_queue_plugged(drive->queue)) { | |
1094 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1095 | break; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * we know that the queue isn't empty, but this can happen | |
1100 | * if the q->prep_rq_fn() decides to kill a request | |
1101 | */ | |
1102 | rq = elv_next_request(drive->queue); | |
1103 | if (!rq) { | |
1104 | hwgroup->busy = 0; | |
1105 | break; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * Sanity: don't accept a request that isn't a PM request | |
1110 | * if we are currently power managed. This is very important as | |
1111 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1112 | * above to return us whatever is in the queue. Since we call | |
1113 | * ide_do_request() ourselves, we end up taking requests while | |
1114 | * the queue is blocked... | |
1115 | * | |
1116 | * We let requests forced at head of queue with ide-preempt | |
1117 | * though. I hope that doesn't happen too much, hopefully not | |
1118 | * unless the subdriver triggers such a thing in its own PM | |
1119 | * state machine. | |
867f8b4e BH |
1120 | * |
1121 | * We count how many times we loop here to make sure we service | |
1122 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1123 | */ |
97100fc8 BZ |
1124 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
1125 | blk_pm_request(rq) == 0 && | |
1126 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
867f8b4e BH |
1127 | drive = drive->next ? drive->next : hwgroup->drive; |
1128 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1129 | goto again; | |
1da177e4 LT |
1130 | /* We clear busy, there should be no pending ATA command at this point. */ |
1131 | hwgroup->busy = 0; | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | hwgroup->rq = rq; | |
1136 | ||
1137 | /* | |
1138 | * Some systems have trouble with IDE IRQs arriving while | |
1139 | * the driver is still setting things up. So, here we disable | |
1140 | * the IRQ used by this interface while the request is being started. | |
1141 | * This may look bad at first, but pretty much the same thing | |
1142 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1143 | * -- the kernel masks the IRQ while it is being handled. | |
1144 | */ | |
1145 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1146 | disable_irq_nosync(hwif->irq); | |
1147 | spin_unlock(&ide_lock); | |
366c7f55 | 1148 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1149 | /* allow other IRQs while we start this request */ |
1150 | startstop = start_request(drive, rq); | |
1151 | spin_lock_irq(&ide_lock); | |
1152 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1153 | enable_irq(hwif->irq); | |
1154 | if (startstop == ide_stopped) | |
1155 | hwgroup->busy = 0; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Passes the stuff to ide_do_request | |
1161 | */ | |
165125e1 | 1162 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1163 | { |
1164 | ide_drive_t *drive = q->queuedata; | |
1165 | ||
1166 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1171 | * retry the current request in pio mode instead of risking tossing it | |
1172 | * all away | |
1173 | */ | |
1174 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1175 | { | |
1176 | ide_hwif_t *hwif = HWIF(drive); | |
1177 | struct request *rq; | |
1178 | ide_startstop_t ret = ide_stopped; | |
1179 | ||
1180 | /* | |
1181 | * end current dma transaction | |
1182 | */ | |
1183 | ||
1184 | if (error < 0) { | |
1185 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1186 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1187 | ret = ide_error(drive, "dma timeout error", |
374e042c | 1188 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1189 | } else { |
1190 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1191 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1192 | } |
1193 | ||
1194 | /* | |
1195 | * disable dma for now, but remember that we did so because of | |
1196 | * a timeout -- we'll reenable after we finish this next request | |
1197 | * (or rather the first chunk of it) in pio. | |
1198 | */ | |
c3922048 | 1199 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 1200 | drive->retry_pio++; |
4a546e04 | 1201 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1202 | |
1203 | /* | |
1204 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1205 | * make sure request is sane | |
1206 | */ | |
1207 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1208 | |
1209 | if (!rq) | |
1210 | goto out; | |
1211 | ||
1da177e4 LT |
1212 | HWGROUP(drive)->rq = NULL; |
1213 | ||
1214 | rq->errors = 0; | |
1215 | ||
1216 | if (!rq->bio) | |
1217 | goto out; | |
1218 | ||
1219 | rq->sector = rq->bio->bi_sector; | |
1220 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1221 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1222 | rq->buffer = bio_data(rq->bio); | |
1223 | out: | |
1224 | return ret; | |
1225 | } | |
1226 | ||
1227 | /** | |
1228 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1229 | * @data: timer callback magic (hwgroup) | |
1230 | * | |
1231 | * An IDE command has timed out before the expected drive return | |
1232 | * occurred. At this point we attempt to clean up the current | |
1233 | * mess. If the current handler includes an expiry handler then | |
1234 | * we invoke the expiry handler, and providing it is happy the | |
1235 | * work is done. If that fails we apply generic recovery rules | |
1236 | * invoking the handler and checking the drive DMA status. We | |
1237 | * have an excessively incestuous relationship with the DMA | |
1238 | * logic that wants cleaning up. | |
1239 | */ | |
1240 | ||
1241 | void ide_timer_expiry (unsigned long data) | |
1242 | { | |
1243 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1244 | ide_handler_t *handler; | |
1245 | ide_expiry_t *expiry; | |
1246 | unsigned long flags; | |
1247 | unsigned long wait = -1; | |
1248 | ||
1249 | spin_lock_irqsave(&ide_lock, flags); | |
1250 | ||
23450319 SS |
1251 | if (((handler = hwgroup->handler) == NULL) || |
1252 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1253 | /* |
1254 | * Either a marginal timeout occurred | |
1255 | * (got the interrupt just as timer expired), | |
1256 | * or we were "sleeping" to give other devices a chance. | |
1257 | * Either way, we don't really want to complain about anything. | |
1258 | */ | |
1259 | if (hwgroup->sleeping) { | |
1260 | hwgroup->sleeping = 0; | |
1261 | hwgroup->busy = 0; | |
1262 | } | |
1263 | } else { | |
1264 | ide_drive_t *drive = hwgroup->drive; | |
1265 | if (!drive) { | |
1266 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1267 | hwgroup->handler = NULL; | |
1268 | } else { | |
1269 | ide_hwif_t *hwif; | |
1270 | ide_startstop_t startstop = ide_stopped; | |
1271 | if (!hwgroup->busy) { | |
1272 | hwgroup->busy = 1; /* paranoia */ | |
1273 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1274 | } | |
1275 | if ((expiry = hwgroup->expiry) != NULL) { | |
1276 | /* continue */ | |
1277 | if ((wait = expiry(drive)) > 0) { | |
1278 | /* reset timer */ | |
1279 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1280 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1281 | add_timer(&hwgroup->timer); |
1282 | spin_unlock_irqrestore(&ide_lock, flags); | |
1283 | return; | |
1284 | } | |
1285 | } | |
1286 | hwgroup->handler = NULL; | |
1287 | /* | |
1288 | * We need to simulate a real interrupt when invoking | |
1289 | * the handler() function, which means we need to | |
1290 | * globally mask the specific IRQ: | |
1291 | */ | |
1292 | spin_unlock(&ide_lock); | |
1293 | hwif = HWIF(drive); | |
1da177e4 LT |
1294 | /* disable_irq_nosync ?? */ |
1295 | disable_irq(hwif->irq); | |
1da177e4 LT |
1296 | /* local CPU only, |
1297 | * as if we were handling an interrupt */ | |
1298 | local_irq_disable(); | |
1299 | if (hwgroup->polling) { | |
1300 | startstop = handler(drive); | |
1301 | } else if (drive_is_ready(drive)) { | |
1302 | if (drive->waiting_for_dma) | |
5e37bdc0 | 1303 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1304 | (void)ide_ack_intr(hwif); |
1305 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1306 | startstop = handler(drive); | |
1307 | } else { | |
1308 | if (drive->waiting_for_dma) { | |
1309 | startstop = ide_dma_timeout_retry(drive, wait); | |
1310 | } else | |
1311 | startstop = | |
c47137a9 | 1312 | ide_error(drive, "irq timeout", |
374e042c | 1313 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1314 | } |
1315 | drive->service_time = jiffies - drive->service_start; | |
1316 | spin_lock_irq(&ide_lock); | |
1317 | enable_irq(hwif->irq); | |
1318 | if (startstop == ide_stopped) | |
1319 | hwgroup->busy = 0; | |
1320 | } | |
1321 | } | |
1322 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1323 | spin_unlock_irqrestore(&ide_lock, flags); | |
1324 | } | |
1325 | ||
1326 | /** | |
1327 | * unexpected_intr - handle an unexpected IDE interrupt | |
1328 | * @irq: interrupt line | |
1329 | * @hwgroup: hwgroup being processed | |
1330 | * | |
1331 | * There's nothing really useful we can do with an unexpected interrupt, | |
1332 | * other than reading the status register (to clear it), and logging it. | |
1333 | * There should be no way that an irq can happen before we're ready for it, | |
1334 | * so we needn't worry much about losing an "important" interrupt here. | |
1335 | * | |
1336 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1337 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1338 | * looks "good", we just ignore the interrupt completely. | |
1339 | * | |
1340 | * This routine assumes __cli() is in effect when called. | |
1341 | * | |
1342 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1343 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1344 | * we could screw up by interfering with a new request being set up for | |
1345 | * irq15. | |
1346 | * | |
1347 | * In reality, this is a non-issue. The new command is not sent unless | |
1348 | * the drive is ready to accept one, in which case we know the drive is | |
1349 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1350 | * before completing the issuance of any new drive command, so we will not | |
1351 | * be accidentally invoked as a result of any valid command completion | |
1352 | * interrupt. | |
1353 | * | |
1354 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1355 | * is doing the current command, but we don't know which hwif burped | |
1356 | * mysteriously. | |
1357 | */ | |
1358 | ||
1359 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1360 | { | |
1361 | u8 stat; | |
1362 | ide_hwif_t *hwif = hwgroup->hwif; | |
1363 | ||
1364 | /* | |
1365 | * handle the unexpected interrupt | |
1366 | */ | |
1367 | do { | |
1368 | if (hwif->irq == irq) { | |
374e042c | 1369 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1370 | |
3a7d2484 | 1371 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1372 | /* Try to not flood the console with msgs */ |
1373 | static unsigned long last_msgtime, count; | |
1374 | ++count; | |
1375 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1376 | last_msgtime = jiffies; | |
1377 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1378 | "status=0x%02x, count=%ld\n", | |
1379 | hwif->name, | |
1380 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1381 | } | |
1382 | } | |
1383 | } | |
1384 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1385 | } | |
1386 | ||
1387 | /** | |
1388 | * ide_intr - default IDE interrupt handler | |
1389 | * @irq: interrupt number | |
1390 | * @dev_id: hwif group | |
1391 | * @regs: unused weirdness from the kernel irq layer | |
1392 | * | |
1393 | * This is the default IRQ handler for the IDE layer. You should | |
1394 | * not need to override it. If you do be aware it is subtle in | |
1395 | * places | |
1396 | * | |
1397 | * hwgroup->hwif is the interface in the group currently performing | |
1398 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1399 | * the IRQ handler to call. As we issue a command the handlers | |
1400 | * step through multiple states, reassigning the handler to the | |
1401 | * next step in the process. Unlike a smart SCSI controller IDE | |
1402 | * expects the main processor to sequence the various transfer | |
1403 | * stages. We also manage a poll timer to catch up with most | |
1404 | * timeout situations. There are still a few where the handlers | |
1405 | * don't ever decide to give up. | |
1406 | * | |
1407 | * The handler eventually returns ide_stopped to indicate the | |
1408 | * request completed. At this point we issue the next request | |
1409 | * on the hwgroup and the process begins again. | |
1410 | */ | |
1411 | ||
7d12e780 | 1412 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1413 | { |
1414 | unsigned long flags; | |
1415 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1416 | ide_hwif_t *hwif; | |
1417 | ide_drive_t *drive; | |
1418 | ide_handler_t *handler; | |
1419 | ide_startstop_t startstop; | |
1420 | ||
1421 | spin_lock_irqsave(&ide_lock, flags); | |
1422 | hwif = hwgroup->hwif; | |
1423 | ||
1424 | if (!ide_ack_intr(hwif)) { | |
1425 | spin_unlock_irqrestore(&ide_lock, flags); | |
1426 | return IRQ_NONE; | |
1427 | } | |
1428 | ||
1429 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1430 | /* | |
1431 | * Not expecting an interrupt from this drive. | |
1432 | * That means this could be: | |
1433 | * (1) an interrupt from another PCI device | |
1434 | * sharing the same PCI INT# as us. | |
1435 | * or (2) a drive just entered sleep or standby mode, | |
1436 | * and is interrupting to let us know. | |
1437 | * or (3) a spurious interrupt of unknown origin. | |
1438 | * | |
1439 | * For PCI, we cannot tell the difference, | |
1440 | * so in that case we just ignore it and hope it goes away. | |
1441 | * | |
1442 | * FIXME: unexpected_intr should be hwif-> then we can | |
1443 | * remove all the ifdef PCI crap | |
1444 | */ | |
1445 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1446 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1447 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1448 | { | |
1449 | /* | |
1450 | * Probably not a shared PCI interrupt, | |
1451 | * so we can safely try to do something about it: | |
1452 | */ | |
1453 | unexpected_intr(irq, hwgroup); | |
1454 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1455 | } else { | |
1456 | /* | |
1457 | * Whack the status register, just in case | |
1458 | * we have a leftover pending IRQ. | |
1459 | */ | |
374e042c | 1460 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1461 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1462 | } | |
1463 | spin_unlock_irqrestore(&ide_lock, flags); | |
1464 | return IRQ_NONE; | |
1465 | } | |
1466 | drive = hwgroup->drive; | |
1467 | if (!drive) { | |
1468 | /* | |
1469 | * This should NEVER happen, and there isn't much | |
1470 | * we could do about it here. | |
1471 | * | |
1472 | * [Note - this can occur if the drive is hot unplugged] | |
1473 | */ | |
1474 | spin_unlock_irqrestore(&ide_lock, flags); | |
1475 | return IRQ_HANDLED; | |
1476 | } | |
1477 | if (!drive_is_ready(drive)) { | |
1478 | /* | |
1479 | * This happens regularly when we share a PCI IRQ with | |
1480 | * another device. Unfortunately, it can also happen | |
1481 | * with some buggy drives that trigger the IRQ before | |
1482 | * their status register is up to date. Hopefully we have | |
1483 | * enough advance overhead that the latter isn't a problem. | |
1484 | */ | |
1485 | spin_unlock_irqrestore(&ide_lock, flags); | |
1486 | return IRQ_NONE; | |
1487 | } | |
1488 | if (!hwgroup->busy) { | |
1489 | hwgroup->busy = 1; /* paranoia */ | |
1490 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1491 | } | |
1492 | hwgroup->handler = NULL; | |
23450319 | 1493 | hwgroup->req_gen++; |
1da177e4 LT |
1494 | del_timer(&hwgroup->timer); |
1495 | spin_unlock(&ide_lock); | |
1496 | ||
f0dd8712 AL |
1497 | /* Some controllers might set DMA INTR no matter DMA or PIO; |
1498 | * bmdma status might need to be cleared even for | |
1499 | * PIO interrupts to prevent spurious/lost irq. | |
1500 | */ | |
1501 | if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma)) | |
1502 | /* ide_dma_end() needs bmdma status for error checking. | |
1503 | * So, skip clearing bmdma status here and leave it | |
1504 | * to ide_dma_end() if this is dma interrupt. | |
1505 | */ | |
1506 | hwif->ide_dma_clear_irq(drive); | |
1507 | ||
97100fc8 | 1508 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1509 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1510 | /* service this interrupt, may set handler for next interrupt */ |
1511 | startstop = handler(drive); | |
1512 | spin_lock_irq(&ide_lock); | |
1513 | ||
1514 | /* | |
1515 | * Note that handler() may have set things up for another | |
1516 | * interrupt to occur soon, but it cannot happen until | |
1517 | * we exit from this routine, because it will be the | |
1518 | * same irq as is currently being serviced here, and Linux | |
1519 | * won't allow another of the same (on any CPU) until we return. | |
1520 | */ | |
1521 | drive->service_time = jiffies - drive->service_start; | |
1522 | if (startstop == ide_stopped) { | |
1523 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1524 | hwgroup->busy = 0; | |
1525 | ide_do_request(hwgroup, hwif->irq); | |
1526 | } else { | |
1527 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1528 | "on exit\n", drive->name); | |
1529 | } | |
1530 | } | |
1531 | spin_unlock_irqrestore(&ide_lock, flags); | |
1532 | return IRQ_HANDLED; | |
1533 | } | |
1534 | ||
1da177e4 LT |
1535 | /** |
1536 | * ide_do_drive_cmd - issue IDE special command | |
1537 | * @drive: device to issue command | |
1538 | * @rq: request to issue | |
1da177e4 LT |
1539 | * |
1540 | * This function issues a special IDE device request | |
1541 | * onto the request queue. | |
1542 | * | |
63f5abb0 FT |
1543 | * the rq is queued at the head of the request queue, displacing |
1544 | * the currently-being-processed request and this function | |
1545 | * returns immediately without waiting for the new rq to be | |
1546 | * completed. This is VERY DANGEROUS, and is intended for | |
1547 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1548 | */ |
63f5abb0 FT |
1549 | |
1550 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 LT |
1551 | { |
1552 | unsigned long flags; | |
1553 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
e8a96aa7 | 1554 | |
1da177e4 | 1555 | spin_lock_irqsave(&ide_lock, flags); |
63f5abb0 FT |
1556 | hwgroup->rq = NULL; |
1557 | __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 1); | |
c6866a6f | 1558 | __generic_unplug_device(drive->queue); |
1da177e4 | 1559 | spin_unlock_irqrestore(&ide_lock, flags); |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1563 | |
1564 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1565 | { | |
6e6afb3b | 1566 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1567 | ide_task_t task; |
1568 | ||
1569 | memset(&task, 0, sizeof(task)); | |
1570 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1571 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1572 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1573 | task.tf.lbam = bcount & 0xff; | |
1574 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1575 | ||
089c5c7e | 1576 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1577 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1578 | SELECT_MASK(drive, 0); |
374e042c | 1579 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1580 | } |
1581 | ||
1582 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1583 | |
1584 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1585 | { | |
1586 | ide_hwif_t *hwif = drive->hwif; | |
1587 | u8 buf[4] = { 0 }; | |
1588 | ||
1589 | while (len > 0) { | |
1590 | if (write) | |
374e042c | 1591 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1592 | else |
374e042c | 1593 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1594 | len -= 4; |
1595 | } | |
1596 | } | |
1597 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |