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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IDE I/O functions | |
3 | * | |
4 | * Basic PIO and command management functionality. | |
5 | * | |
6 | * This code was split off from ide.c. See ide.c for history and original | |
7 | * copyrights. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2, or (at your option) any | |
12 | * later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * For the avoidance of doubt the "preferred form" of this code is one which | |
20 | * is in an open non patent encumbered format. Where cryptographic key signing | |
21 | * forms part of the process of creating an executable the information | |
22 | * including keys needed to generate an equivalently functional executable | |
23 | * are deemed to be part of the source code. | |
24 | */ | |
25 | ||
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/major.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/genhd.h> | |
37 | #include <linux/blkpg.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/pci.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/ide.h> | |
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 | */ | |
81 | if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) { | |
82 | drive->state = 0; | |
4a546e04 | 83 | ide_dma_on(drive); |
1da177e4 LT |
84 | } |
85 | ||
5e36bb6e KU |
86 | if (!__blk_end_request(rq, error, nr_bytes)) { |
87 | if (dequeue) | |
bbc615b1 | 88 | HWGROUP(drive)->rq = NULL; |
1da177e4 LT |
89 | ret = 0; |
90 | } | |
8672d571 | 91 | |
1da177e4 LT |
92 | return ret; |
93 | } | |
1da177e4 LT |
94 | |
95 | /** | |
96 | * ide_end_request - complete an IDE I/O | |
97 | * @drive: IDE device for the I/O | |
98 | * @uptodate: | |
99 | * @nr_sectors: number of sectors completed | |
100 | * | |
101 | * This is our end_request wrapper function. We complete the I/O | |
102 | * update random number input and dequeue the request, which if | |
103 | * it was tagged may be out of order. | |
104 | */ | |
105 | ||
106 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
107 | { | |
41e9d344 | 108 | unsigned int nr_bytes = nr_sectors << 9; |
1da177e4 LT |
109 | struct request *rq; |
110 | unsigned long flags; | |
111 | int ret = 1; | |
112 | ||
8672d571 JA |
113 | /* |
114 | * room for locking improvements here, the calls below don't | |
115 | * need the queue lock held at all | |
116 | */ | |
1da177e4 LT |
117 | spin_lock_irqsave(&ide_lock, flags); |
118 | rq = HWGROUP(drive)->rq; | |
119 | ||
41e9d344 JA |
120 | if (!nr_bytes) { |
121 | if (blk_pc_request(rq)) | |
122 | nr_bytes = rq->data_len; | |
123 | else | |
124 | nr_bytes = rq->hard_cur_sectors << 9; | |
125 | } | |
1da177e4 | 126 | |
bbc615b1 | 127 | ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
128 | |
129 | spin_unlock_irqrestore(&ide_lock, flags); | |
130 | return ret; | |
131 | } | |
132 | EXPORT_SYMBOL(ide_end_request); | |
133 | ||
134 | /* | |
135 | * Power Management state machine. This one is rather trivial for now, | |
136 | * we should probably add more, like switching back to PIO on suspend | |
137 | * to help some BIOSes, re-do the door locking on resume, etc... | |
138 | */ | |
139 | ||
140 | enum { | |
141 | ide_pm_flush_cache = ide_pm_state_start_suspend, | |
142 | idedisk_pm_standby, | |
143 | ||
8c2c0118 JL |
144 | idedisk_pm_restore_pio = ide_pm_state_start_resume, |
145 | idedisk_pm_idle, | |
1da177e4 LT |
146 | ide_pm_restore_dma, |
147 | }; | |
148 | ||
149 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) | |
150 | { | |
c00895ab | 151 | struct request_pm_state *pm = rq->data; |
ad3cadda | 152 | |
1da177e4 LT |
153 | if (drive->media != ide_disk) |
154 | return; | |
155 | ||
ad3cadda | 156 | switch (pm->pm_step) { |
1da177e4 | 157 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */ |
ad3cadda JA |
158 | if (pm->pm_state == PM_EVENT_FREEZE) |
159 | pm->pm_step = ide_pm_state_completed; | |
1da177e4 | 160 | else |
ad3cadda | 161 | pm->pm_step = idedisk_pm_standby; |
1da177e4 LT |
162 | break; |
163 | case idedisk_pm_standby: /* Suspend step 2 (standby) complete */ | |
ad3cadda | 164 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 165 | break; |
8c2c0118 JL |
166 | case idedisk_pm_restore_pio: /* Resume step 1 complete */ |
167 | pm->pm_step = idedisk_pm_idle; | |
168 | break; | |
169 | case idedisk_pm_idle: /* Resume step 2 (idle) complete */ | |
ad3cadda | 170 | pm->pm_step = ide_pm_restore_dma; |
1da177e4 LT |
171 | break; |
172 | } | |
173 | } | |
174 | ||
175 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
176 | { | |
c00895ab | 177 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
178 | ide_task_t *args = rq->special; |
179 | ||
180 | memset(args, 0, sizeof(*args)); | |
181 | ||
ad3cadda | 182 | switch (pm->pm_step) { |
1da177e4 LT |
183 | case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */ |
184 | if (drive->media != ide_disk) | |
185 | break; | |
186 | /* Not supported? Switch to next step now. */ | |
97100fc8 BZ |
187 | if (ata_id_flush_enabled(drive->id) == 0 || |
188 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { | |
1da177e4 LT |
189 | ide_complete_power_step(drive, rq, 0, 0); |
190 | return ide_stopped; | |
191 | } | |
ff2779b5 | 192 | if (ata_id_flush_ext_enabled(drive->id)) |
aaaade3f | 193 | args->tf.command = ATA_CMD_FLUSH_EXT; |
1da177e4 | 194 | else |
aaaade3f | 195 | args->tf.command = ATA_CMD_FLUSH; |
74095a91 | 196 | goto out_do_tf; |
1da177e4 LT |
197 | |
198 | case idedisk_pm_standby: /* Suspend step 2 (standby) */ | |
aaaade3f | 199 | args->tf.command = ATA_CMD_STANDBYNOW1; |
74095a91 | 200 | goto out_do_tf; |
1da177e4 | 201 | |
8c2c0118 | 202 | case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */ |
26bcb879 | 203 | ide_set_max_pio(drive); |
317a46a2 BZ |
204 | /* |
205 | * skip idedisk_pm_idle for ATAPI devices | |
206 | */ | |
207 | if (drive->media != ide_disk) | |
208 | pm->pm_step = ide_pm_restore_dma; | |
209 | else | |
210 | ide_complete_power_step(drive, rq, 0, 0); | |
8c2c0118 JL |
211 | return ide_stopped; |
212 | ||
213 | case idedisk_pm_idle: /* Resume step 2 (idle) */ | |
aaaade3f | 214 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
74095a91 | 215 | goto out_do_tf; |
1da177e4 | 216 | |
8c2c0118 | 217 | case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */ |
1da177e4 | 218 | /* |
0ae2e178 | 219 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
220 | * we could be smarter and check for current xfer_speed |
221 | * in struct drive etc... | |
222 | */ | |
5e37bdc0 | 223 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 224 | break; |
8987d21b | 225 | /* |
97100fc8 | 226 | * TODO: respect IDE_DFLAG_USING_DMA |
8987d21b | 227 | */ |
3608b5d7 | 228 | ide_set_dma(drive); |
1da177e4 LT |
229 | break; |
230 | } | |
ad3cadda | 231 | pm->pm_step = ide_pm_state_completed; |
1da177e4 | 232 | return ide_stopped; |
74095a91 BZ |
233 | |
234 | out_do_tf: | |
657cc1a8 | 235 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 236 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 237 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
238 | } |
239 | ||
dbe217af AC |
240 | /** |
241 | * ide_end_dequeued_request - complete an IDE I/O | |
242 | * @drive: IDE device for the I/O | |
243 | * @uptodate: | |
244 | * @nr_sectors: number of sectors completed | |
245 | * | |
246 | * Complete an I/O that is no longer on the request queue. This | |
247 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
248 | * We must still finish the old request but we must not tamper with the | |
249 | * queue in the meantime. | |
250 | * | |
251 | * NOTE: This path does not handle barrier, but barrier is not supported | |
252 | * on ide-cd anyway. | |
253 | */ | |
254 | ||
255 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
256 | int uptodate, int nr_sectors) | |
257 | { | |
258 | unsigned long flags; | |
bbc615b1 | 259 | int ret; |
dbe217af AC |
260 | |
261 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 262 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 263 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 264 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 265 | |
dbe217af AC |
266 | return ret; |
267 | } | |
268 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
269 | ||
270 | ||
1da177e4 LT |
271 | /** |
272 | * ide_complete_pm_request - end the current Power Management request | |
273 | * @drive: target drive | |
274 | * @rq: request | |
275 | * | |
276 | * This function cleans up the current PM request and stops the queue | |
277 | * if necessary. | |
278 | */ | |
279 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
280 | { | |
281 | unsigned long flags; | |
282 | ||
283 | #ifdef DEBUG_PM | |
284 | printk("%s: completing PM request, %s\n", drive->name, | |
285 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
286 | #endif | |
287 | spin_lock_irqsave(&ide_lock, flags); | |
288 | if (blk_pm_suspend_request(rq)) { | |
289 | blk_stop_queue(drive->queue); | |
290 | } else { | |
97100fc8 | 291 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
1da177e4 LT |
292 | blk_start_queue(drive->queue); |
293 | } | |
1da177e4 | 294 | HWGROUP(drive)->rq = NULL; |
5e36bb6e KU |
295 | if (__blk_end_request(rq, 0, 0)) |
296 | BUG(); | |
1da177e4 LT |
297 | spin_unlock_irqrestore(&ide_lock, flags); |
298 | } | |
299 | ||
1da177e4 LT |
300 | /** |
301 | * ide_end_drive_cmd - end an explicit drive command | |
302 | * @drive: command | |
303 | * @stat: status bits | |
304 | * @err: error bits | |
305 | * | |
306 | * Clean up after success/failure of an explicit drive command. | |
307 | * These get thrown onto the queue so they are synchronized with | |
308 | * real I/O operations on the drive. | |
309 | * | |
310 | * In LBA48 mode we have to read the register set twice to get | |
311 | * all the extra information out. | |
312 | */ | |
313 | ||
314 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
315 | { | |
1da177e4 LT |
316 | unsigned long flags; |
317 | struct request *rq; | |
318 | ||
319 | spin_lock_irqsave(&ide_lock, flags); | |
320 | rq = HWGROUP(drive)->rq; | |
321 | spin_unlock_irqrestore(&ide_lock, flags); | |
322 | ||
7267c337 | 323 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
324 | ide_task_t *task = (ide_task_t *)rq->special; |
325 | ||
1da177e4 | 326 | if (rq->errors == 0) |
3a7d2484 | 327 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
395d8ef5 BZ |
328 | |
329 | if (task) { | |
330 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 331 | |
650d841d | 332 | tf->error = err; |
650d841d | 333 | tf->status = stat; |
1da177e4 | 334 | |
374e042c | 335 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
336 | |
337 | if (task->tf_flags & IDE_TFLAG_DYN) | |
338 | kfree(task); | |
1da177e4 LT |
339 | } |
340 | } else if (blk_pm_request(rq)) { | |
c00895ab | 341 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
342 | #ifdef DEBUG_PM |
343 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
344 | drive->name, rq->pm->pm_step, stat, err); | |
345 | #endif | |
346 | ide_complete_power_step(drive, rq, stat, err); | |
ad3cadda | 347 | if (pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
348 | ide_complete_pm_request(drive, rq); |
349 | return; | |
350 | } | |
351 | ||
352 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
353 | HWGROUP(drive)->rq = NULL; |
354 | rq->errors = err; | |
3b0e044d KU |
355 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
356 | blk_rq_bytes(rq)))) | |
5e36bb6e | 357 | BUG(); |
1da177e4 LT |
358 | spin_unlock_irqrestore(&ide_lock, flags); |
359 | } | |
360 | ||
361 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
362 | ||
1da177e4 LT |
363 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
364 | { | |
365 | if (rq->rq_disk) { | |
366 | ide_driver_t *drv; | |
367 | ||
368 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
369 | drv->end_request(drive, 0, 0); | |
370 | } else | |
371 | ide_end_request(drive, 0, 0); | |
372 | } | |
373 | ||
374 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
375 | { | |
376 | ide_hwif_t *hwif = drive->hwif; | |
377 | ||
97100fc8 BZ |
378 | if ((stat & ATA_BUSY) || |
379 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
380 | /* other bits are useless when BUSY */ |
381 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 382 | } else if (stat & ATA_ERR) { |
1da177e4 | 383 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 384 | if (err == ATA_ABORTED) { |
1da177e4 | 385 | if (drive->select.b.lba && |
aaaade3f BZ |
386 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
387 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
388 | return ide_stopped; |
389 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
390 | /* UDMA crc error, just retry the operation */ | |
391 | drive->crc_count++; | |
3a7d2484 | 392 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
393 | /* retries won't help these */ |
394 | rq->errors = ERROR_MAX; | |
3a7d2484 | 395 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
396 | /* help it find track zero */ |
397 | rq->errors |= ERROR_RECAL; | |
398 | } | |
399 | } | |
400 | ||
3a7d2484 | 401 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
402 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
403 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
404 | ||
405 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
406 | } | |
1da177e4 | 407 | |
513daadd SS |
408 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
409 | ide_kill_rq(drive, rq); | |
410 | return ide_stopped; | |
411 | } | |
412 | ||
3a7d2484 | 413 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 414 | rq->errors |= ERROR_RESET; |
1da177e4 | 415 | |
513daadd | 416 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 417 | ++rq->errors; |
513daadd | 418 | return ide_do_reset(drive); |
1da177e4 | 419 | } |
513daadd SS |
420 | |
421 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
422 | drive->special.b.recalibrate = 1; | |
423 | ||
424 | ++rq->errors; | |
425 | ||
1da177e4 LT |
426 | return ide_stopped; |
427 | } | |
428 | ||
429 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
430 | { | |
431 | ide_hwif_t *hwif = drive->hwif; | |
432 | ||
97100fc8 BZ |
433 | if ((stat & ATA_BUSY) || |
434 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
435 | /* other bits are useless when BUSY */ |
436 | rq->errors |= ERROR_RESET; | |
437 | } else { | |
438 | /* add decoding error stuff */ | |
439 | } | |
440 | ||
3a7d2484 | 441 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 442 | /* force an abort */ |
aaaade3f | 443 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
444 | |
445 | if (rq->errors >= ERROR_MAX) { | |
446 | ide_kill_rq(drive, rq); | |
447 | } else { | |
448 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
449 | ++rq->errors; | |
450 | return ide_do_reset(drive); | |
451 | } | |
452 | ++rq->errors; | |
453 | } | |
454 | ||
455 | return ide_stopped; | |
456 | } | |
457 | ||
458 | ide_startstop_t | |
459 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
460 | { | |
461 | if (drive->media == ide_disk) | |
462 | return ide_ata_error(drive, rq, stat, err); | |
463 | return ide_atapi_error(drive, rq, stat, err); | |
464 | } | |
465 | ||
466 | EXPORT_SYMBOL_GPL(__ide_error); | |
467 | ||
468 | /** | |
469 | * ide_error - handle an error on the IDE | |
470 | * @drive: drive the error occurred on | |
471 | * @msg: message to report | |
472 | * @stat: status bits | |
473 | * | |
474 | * ide_error() takes action based on the error returned by the drive. | |
475 | * For normal I/O that may well include retries. We deal with | |
476 | * both new-style (taskfile) and old style command handling here. | |
477 | * In the case of taskfile command handling there is work left to | |
478 | * do | |
479 | */ | |
480 | ||
481 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
482 | { | |
483 | struct request *rq; | |
484 | u8 err; | |
485 | ||
486 | err = ide_dump_status(drive, msg, stat); | |
487 | ||
488 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
489 | return ide_stopped; | |
490 | ||
491 | /* retry only "normal" I/O: */ | |
4aff5e23 | 492 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
493 | rq->errors = 1; |
494 | ide_end_drive_cmd(drive, stat, err); | |
495 | return ide_stopped; | |
496 | } | |
497 | ||
498 | if (rq->rq_disk) { | |
499 | ide_driver_t *drv; | |
500 | ||
501 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
502 | return drv->error(drive, rq, stat, err); | |
503 | } else | |
504 | return __ide_error(drive, rq, stat, err); | |
505 | } | |
506 | ||
507 | EXPORT_SYMBOL_GPL(ide_error); | |
508 | ||
57d7366b | 509 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 510 | { |
57d7366b BZ |
511 | tf->nsect = drive->sect; |
512 | tf->lbal = drive->sect; | |
513 | tf->lbam = drive->cyl; | |
514 | tf->lbah = drive->cyl >> 8; | |
515 | tf->device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA; | |
aaaade3f | 516 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
517 | } |
518 | ||
57d7366b | 519 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 520 | { |
57d7366b | 521 | tf->nsect = drive->sect; |
aaaade3f | 522 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
523 | } |
524 | ||
57d7366b | 525 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 526 | { |
57d7366b | 527 | tf->nsect = drive->mult_req; |
aaaade3f | 528 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
529 | } |
530 | ||
531 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
532 | { | |
533 | special_t *s = &drive->special; | |
534 | ide_task_t args; | |
535 | ||
536 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 537 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
538 | |
539 | if (s->b.set_geometry) { | |
540 | s->b.set_geometry = 0; | |
57d7366b | 541 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
542 | } else if (s->b.recalibrate) { |
543 | s->b.recalibrate = 0; | |
57d7366b | 544 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
545 | } else if (s->b.set_multmode) { |
546 | s->b.set_multmode = 0; | |
57d7366b | 547 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
548 | } else if (s->all) { |
549 | int special = s->all; | |
550 | s->all = 0; | |
551 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
552 | return ide_stopped; | |
553 | } | |
554 | ||
657cc1a8 | 555 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 556 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 557 | |
1da177e4 LT |
558 | do_rw_taskfile(drive, &args); |
559 | ||
560 | return ide_started; | |
561 | } | |
562 | ||
26bcb879 BZ |
563 | /* |
564 | * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away | |
565 | */ | |
566 | static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) | |
567 | { | |
568 | switch (req_pio) { | |
569 | case 202: | |
570 | case 201: | |
571 | case 200: | |
572 | case 102: | |
573 | case 101: | |
574 | case 100: | |
575 | return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; | |
576 | case 9: | |
577 | case 8: | |
578 | return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; | |
579 | case 7: | |
580 | case 6: | |
581 | return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; | |
582 | default: | |
583 | return 0; | |
584 | } | |
585 | } | |
586 | ||
1da177e4 LT |
587 | /** |
588 | * do_special - issue some special commands | |
589 | * @drive: drive the command is for | |
590 | * | |
aaaade3f BZ |
591 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
592 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
593 | * | |
594 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
595 | */ |
596 | ||
597 | static ide_startstop_t do_special (ide_drive_t *drive) | |
598 | { | |
599 | special_t *s = &drive->special; | |
600 | ||
601 | #ifdef DEBUG | |
602 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
603 | #endif | |
604 | if (s->b.set_tune) { | |
26bcb879 | 605 | ide_hwif_t *hwif = drive->hwif; |
ac95beed | 606 | const struct ide_port_ops *port_ops = hwif->port_ops; |
26bcb879 BZ |
607 | u8 req_pio = drive->tune_req; |
608 | ||
1da177e4 | 609 | s->b.set_tune = 0; |
26bcb879 BZ |
610 | |
611 | if (set_pio_mode_abuse(drive->hwif, req_pio)) { | |
d393aa03 | 612 | /* |
97100fc8 | 613 | * take ide_lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT |
d393aa03 BZ |
614 | */ |
615 | if (req_pio == 8 || req_pio == 9) { | |
616 | unsigned long flags; | |
617 | ||
618 | spin_lock_irqsave(&ide_lock, flags); | |
ac95beed | 619 | port_ops->set_pio_mode(drive, req_pio); |
d393aa03 BZ |
620 | spin_unlock_irqrestore(&ide_lock, flags); |
621 | } else | |
ac95beed | 622 | port_ops->set_pio_mode(drive, req_pio); |
aedea591 | 623 | } else { |
97100fc8 BZ |
624 | int keep_dma = |
625 | !!(drive->dev_flags & IDE_DFLAG_USING_DMA); | |
aedea591 | 626 | |
26bcb879 BZ |
627 | ide_set_pio(drive, req_pio); |
628 | ||
aedea591 BZ |
629 | if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { |
630 | if (keep_dma) | |
4a546e04 | 631 | ide_dma_on(drive); |
aedea591 BZ |
632 | } |
633 | } | |
634 | ||
1da177e4 LT |
635 | return ide_stopped; |
636 | } else { | |
637 | if (drive->media == ide_disk) | |
638 | return ide_disk_special(drive); | |
639 | ||
640 | s->all = 0; | |
641 | drive->mult_req = 0; | |
642 | return ide_stopped; | |
643 | } | |
644 | } | |
645 | ||
646 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
647 | { | |
648 | ide_hwif_t *hwif = drive->hwif; | |
649 | struct scatterlist *sg = hwif->sg_table; | |
650 | ||
651 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
652 | return; | |
653 | ||
4aff5e23 | 654 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
655 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
656 | } else { | |
657 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
658 | hwif->sg_nents = 1; | |
659 | } | |
660 | } | |
661 | ||
662 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
663 | ||
664 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
665 | { | |
666 | ide_hwif_t *hwif = drive->hwif; | |
667 | ||
668 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
669 | hwif->cursg_ofs = 0; |
670 | hwif->cursg = NULL; | |
1da177e4 LT |
671 | } |
672 | ||
673 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
674 | ||
675 | /** | |
676 | * execute_drive_command - issue special drive command | |
338cec32 | 677 | * @drive: the drive to issue the command on |
1da177e4 LT |
678 | * @rq: the request structure holding the command |
679 | * | |
680 | * execute_drive_cmd() issues a special drive command, usually | |
681 | * initiated by ioctl() from the external hdparm program. The | |
682 | * command can be a drive command, drive task or taskfile | |
683 | * operation. Weirdly you can call it with NULL to wait for | |
684 | * all commands to finish. Don't do this as that is due to change | |
685 | */ | |
686 | ||
687 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
688 | struct request *rq) | |
689 | { | |
690 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 691 | ide_task_t *task = rq->special; |
1da177e4 | 692 | |
7267c337 | 693 | if (task) { |
21d535c9 | 694 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
695 | |
696 | switch (hwif->data_phase) { | |
697 | case TASKFILE_MULTI_OUT: | |
698 | case TASKFILE_OUT: | |
699 | case TASKFILE_MULTI_IN: | |
700 | case TASKFILE_IN: | |
701 | ide_init_sg_cmd(drive, rq); | |
702 | ide_map_sg(drive, rq); | |
703 | default: | |
704 | break; | |
705 | } | |
74095a91 | 706 | |
21d535c9 BZ |
707 | return do_rw_taskfile(drive, task); |
708 | } | |
709 | ||
1da177e4 LT |
710 | /* |
711 | * NULL is actually a valid way of waiting for | |
712 | * all current requests to be flushed from the queue. | |
713 | */ | |
714 | #ifdef DEBUG | |
715 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
716 | #endif | |
374e042c | 717 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 718 | ide_read_error(drive)); |
64a57fe4 | 719 | |
1da177e4 LT |
720 | return ide_stopped; |
721 | } | |
722 | ||
92f1f8fd EO |
723 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
724 | int arg) | |
725 | { | |
726 | struct request_queue *q = drive->queue; | |
727 | struct request *rq; | |
728 | int ret = 0; | |
729 | ||
730 | if (!(setting->flags & DS_SYNC)) | |
731 | return setting->set(drive, arg); | |
732 | ||
733 | rq = blk_get_request(q, READ, GFP_KERNEL); | |
734 | if (!rq) | |
735 | return -ENOMEM; | |
736 | ||
737 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
738 | rq->cmd_len = 5; | |
739 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
740 | *(int *)&rq->cmd[1] = arg; | |
741 | rq->special = setting->set; | |
742 | ||
743 | if (blk_execute_rq(q, NULL, rq, 0)) | |
744 | ret = rq->errors; | |
745 | blk_put_request(rq); | |
746 | ||
747 | return ret; | |
748 | } | |
749 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
750 | ||
79e36a9f EO |
751 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
752 | { | |
753 | switch (rq->cmd[0]) { | |
92f1f8fd EO |
754 | case REQ_DEVSET_EXEC: |
755 | { | |
756 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
757 | ||
758 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
759 | if (err) | |
760 | rq->errors = err; | |
761 | else | |
762 | err = 1; | |
763 | ide_end_request(drive, err, 0); | |
764 | return ide_stopped; | |
765 | } | |
79e36a9f EO |
766 | case REQ_DRIVE_RESET: |
767 | return ide_do_reset(drive); | |
768 | default: | |
769 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
770 | ide_end_request(drive, 0, 0); | |
771 | return ide_stopped; | |
772 | } | |
773 | } | |
774 | ||
ad3cadda JA |
775 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
776 | { | |
c00895ab | 777 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
778 | |
779 | if (blk_pm_suspend_request(rq) && | |
780 | pm->pm_step == ide_pm_state_start_suspend) | |
781 | /* Mark drive blocked when starting the suspend sequence. */ | |
97100fc8 | 782 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
ad3cadda JA |
783 | else if (blk_pm_resume_request(rq) && |
784 | pm->pm_step == ide_pm_state_start_resume) { | |
785 | /* | |
786 | * The first thing we do on wakeup is to wait for BSY bit to | |
787 | * go away (with a looong timeout) as a drive on this hwif may | |
788 | * just be POSTing itself. | |
789 | * We do that before even selecting as the "other" device on | |
790 | * the bus may be broken enough to walk on our toes at this | |
791 | * point. | |
792 | */ | |
6e6afb3b | 793 | ide_hwif_t *hwif = drive->hwif; |
ad3cadda JA |
794 | int rc; |
795 | #ifdef DEBUG_PM | |
796 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
797 | #endif | |
6e6afb3b | 798 | rc = ide_wait_not_busy(hwif, 35000); |
ad3cadda JA |
799 | if (rc) |
800 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
801 | SELECT_DRIVE(drive); | |
374e042c | 802 | hwif->tp_ops->set_irq(hwif, 1); |
6e6afb3b | 803 | rc = ide_wait_not_busy(hwif, 100000); |
ad3cadda JA |
804 | if (rc) |
805 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
806 | } | |
807 | } | |
808 | ||
1da177e4 LT |
809 | /** |
810 | * start_request - start of I/O and command issuing for IDE | |
811 | * | |
812 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 813 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
814 | * |
815 | * FIXME: this function needs a rename | |
816 | */ | |
817 | ||
818 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
819 | { | |
820 | ide_startstop_t startstop; | |
1da177e4 | 821 | |
4aff5e23 | 822 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
823 | |
824 | #ifdef DEBUG | |
825 | printk("%s: start_request: current=0x%08lx\n", | |
826 | HWIF(drive)->name, (unsigned long) rq); | |
827 | #endif | |
828 | ||
829 | /* bail early if we've exceeded max_failures */ | |
830 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 831 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
832 | goto kill_rq; |
833 | } | |
834 | ||
ad3cadda JA |
835 | if (blk_pm_request(rq)) |
836 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
837 | |
838 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
839 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
840 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
841 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
842 | return startstop; | |
843 | } | |
844 | if (!drive->special.all) { | |
845 | ide_driver_t *drv; | |
846 | ||
513daadd SS |
847 | /* |
848 | * We reset the drive so we need to issue a SETFEATURES. | |
849 | * Do it _after_ do_special() restored device parameters. | |
850 | */ | |
851 | if (drive->current_speed == 0xff) | |
852 | ide_config_drive_speed(drive, drive->desired_speed); | |
853 | ||
7267c337 | 854 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
855 | return execute_drive_cmd(drive, rq); |
856 | else if (blk_pm_request(rq)) { | |
c00895ab | 857 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
858 | #ifdef DEBUG_PM |
859 | printk("%s: start_power_step(step: %d)\n", | |
860 | drive->name, rq->pm->pm_step); | |
861 | #endif | |
862 | startstop = ide_start_power_step(drive, rq); | |
863 | if (startstop == ide_stopped && | |
ad3cadda | 864 | pm->pm_step == ide_pm_state_completed) |
1da177e4 LT |
865 | ide_complete_pm_request(drive, rq); |
866 | return startstop; | |
79e36a9f EO |
867 | } else if (!rq->rq_disk && blk_special_request(rq)) |
868 | /* | |
869 | * TODO: Once all ULDs have been modified to | |
870 | * check for specific op codes rather than | |
871 | * blindly accepting any special request, the | |
872 | * check for ->rq_disk above may be replaced | |
873 | * by a more suitable mechanism or even | |
874 | * dropped entirely. | |
875 | */ | |
876 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
877 | |
878 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
879 | |
880 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
881 | } |
882 | return do_special(drive); | |
883 | kill_rq: | |
884 | ide_kill_rq(drive, rq); | |
885 | return ide_stopped; | |
886 | } | |
887 | ||
888 | /** | |
889 | * ide_stall_queue - pause an IDE device | |
890 | * @drive: drive to stall | |
891 | * @timeout: time to stall for (jiffies) | |
892 | * | |
893 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
894 | * to the hwgroup by sleeping for timeout jiffies. | |
895 | */ | |
896 | ||
897 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
898 | { | |
899 | if (timeout > WAIT_WORSTCASE) | |
900 | timeout = WAIT_WORSTCASE; | |
901 | drive->sleep = timeout + jiffies; | |
97100fc8 | 902 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 LT |
903 | } |
904 | ||
905 | EXPORT_SYMBOL(ide_stall_queue); | |
906 | ||
907 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
908 | ||
909 | /** | |
910 | * choose_drive - select a drive to service | |
911 | * @hwgroup: hardware group to select on | |
912 | * | |
913 | * choose_drive() selects the next drive which will be serviced. | |
914 | * This is necessary because the IDE layer can't issue commands | |
915 | * to both drives on the same cable, unlike SCSI. | |
916 | */ | |
917 | ||
918 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
919 | { | |
920 | ide_drive_t *drive, *best; | |
921 | ||
922 | repeat: | |
923 | best = NULL; | |
924 | drive = hwgroup->drive; | |
925 | ||
926 | /* | |
927 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
928 | * though that is 3 requests, it must be seen as a single transaction. | |
929 | * we must not preempt this drive until that is complete | |
930 | */ | |
931 | if (blk_queue_flushing(drive->queue)) { | |
932 | /* | |
933 | * small race where queue could get replugged during | |
934 | * the 3-request flush cycle, just yank the plug since | |
935 | * we want it to finish asap | |
936 | */ | |
937 | blk_remove_plug(drive->queue); | |
938 | return drive; | |
939 | } | |
940 | ||
941 | do { | |
97100fc8 BZ |
942 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
943 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); | |
944 | ||
945 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && | |
946 | !elv_queue_empty(drive->queue)) { | |
947 | if (best == NULL || | |
948 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || | |
949 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { | |
1da177e4 LT |
950 | if (!blk_queue_plugged(drive->queue)) |
951 | best = drive; | |
952 | } | |
953 | } | |
954 | } while ((drive = drive->next) != hwgroup->drive); | |
97100fc8 BZ |
955 | |
956 | if (best && (best->dev_flags & IDE_DFLAG_NICE1) && | |
957 | (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 && | |
958 | best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1da177e4 LT |
959 | long t = (signed long)(WAKEUP(best) - jiffies); |
960 | if (t >= WAIT_MIN_SLEEP) { | |
961 | /* | |
962 | * We *may* have some time to spare, but first let's see if | |
963 | * someone can potentially benefit from our nice mood today.. | |
964 | */ | |
965 | drive = best->next; | |
966 | do { | |
97100fc8 | 967 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
1da177e4 LT |
968 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
969 | && time_before(WAKEUP(drive), jiffies + t)) | |
970 | { | |
971 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
972 | goto repeat; | |
973 | } | |
974 | } while ((drive = drive->next) != best); | |
975 | } | |
976 | } | |
977 | return best; | |
978 | } | |
979 | ||
980 | /* | |
981 | * Issue a new request to a drive from hwgroup | |
982 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
983 | * | |
984 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
985 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
986 | * may have both interfaces in a single hwgroup to "serialize" access. | |
987 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
988 | * together into one hwgroup for serialized access. | |
989 | * | |
990 | * Note also that several hwgroups can end up sharing a single IRQ, | |
991 | * possibly along with many other devices. This is especially common in | |
992 | * PCI-based systems with off-board IDE controller cards. | |
993 | * | |
994 | * The IDE driver uses the single global ide_lock spinlock to protect | |
995 | * access to the request queues, and to protect the hwgroup->busy flag. | |
996 | * | |
997 | * The first thread into the driver for a particular hwgroup sets the | |
998 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
999 | * and then initiates processing of the top request from the request queue. | |
1000 | * | |
1001 | * Other threads attempting entry notice the busy setting, and will simply | |
1002 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
1003 | * remains set even when the driver is merely awaiting the next interrupt. | |
1004 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
1005 | * | |
1006 | * When processing of a request completes, the completing thread or IRQ-handler | |
1007 | * will start the next request from the queue. If no more work remains, | |
1008 | * the driver will clear the hwgroup->busy flag and exit. | |
1009 | * | |
1010 | * The ide_lock (spinlock) is used to protect all access to the | |
1011 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
1012 | * the driver. This makes the driver much more friendlier to shared IRQs | |
1013 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
1014 | */ | |
1015 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
1016 | { | |
1017 | ide_drive_t *drive; | |
1018 | ide_hwif_t *hwif; | |
1019 | struct request *rq; | |
1020 | ide_startstop_t startstop; | |
867f8b4e | 1021 | int loops = 0; |
1da177e4 LT |
1022 | |
1023 | /* for atari only: POSSIBLY BROKEN HERE(?) */ | |
1024 | ide_get_lock(ide_intr, hwgroup); | |
1025 | ||
1026 | /* caller must own ide_lock */ | |
1027 | BUG_ON(!irqs_disabled()); | |
1028 | ||
1029 | while (!hwgroup->busy) { | |
1030 | hwgroup->busy = 1; | |
1031 | drive = choose_drive(hwgroup); | |
1032 | if (drive == NULL) { | |
1033 | int sleeping = 0; | |
1034 | unsigned long sleep = 0; /* shut up, gcc */ | |
1035 | hwgroup->rq = NULL; | |
1036 | drive = hwgroup->drive; | |
1037 | do { | |
97100fc8 BZ |
1038 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
1039 | (sleeping == 0 || | |
1040 | time_before(drive->sleep, sleep))) { | |
1da177e4 LT |
1041 | sleeping = 1; |
1042 | sleep = drive->sleep; | |
1043 | } | |
1044 | } while ((drive = drive->next) != hwgroup->drive); | |
1045 | if (sleeping) { | |
1046 | /* | |
1047 | * Take a short snooze, and then wake up this hwgroup again. | |
1048 | * This gives other hwgroups on the same a chance to | |
1049 | * play fairly with us, just in case there are big differences | |
1050 | * in relative throughputs.. don't want to hog the cpu too much. | |
1051 | */ | |
1052 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1053 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1054 | #if 1 | |
1055 | if (timer_pending(&hwgroup->timer)) | |
1056 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1057 | #endif | |
1058 | /* so that ide_timer_expiry knows what to do */ | |
1059 | hwgroup->sleeping = 1; | |
23450319 | 1060 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1061 | mod_timer(&hwgroup->timer, sleep); |
1062 | /* we purposely leave hwgroup->busy==1 | |
1063 | * while sleeping */ | |
1064 | } else { | |
1065 | /* Ugly, but how can we sleep for the lock | |
1066 | * otherwise? perhaps from tq_disk? | |
1067 | */ | |
1068 | ||
1069 | /* for atari only */ | |
1070 | ide_release_lock(); | |
1071 | hwgroup->busy = 0; | |
1072 | } | |
1073 | ||
1074 | /* no more work for this hwgroup (for now) */ | |
1075 | return; | |
1076 | } | |
867f8b4e | 1077 | again: |
1da177e4 | 1078 | hwif = HWIF(drive); |
81ca6919 | 1079 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1080 | /* |
1081 | * set nIEN for previous hwif, drives in the | |
1082 | * quirk_list may not like intr setups/cleanups | |
1083 | */ | |
1084 | if (drive->quirk_list != 1) | |
374e042c | 1085 | hwif->tp_ops->set_irq(hwif, 0); |
1da177e4 LT |
1086 | } |
1087 | hwgroup->hwif = hwif; | |
1088 | hwgroup->drive = drive; | |
97100fc8 | 1089 | drive->dev_flags &= ~IDE_DFLAG_SLEEPING; |
1da177e4 LT |
1090 | drive->service_start = jiffies; |
1091 | ||
1092 | if (blk_queue_plugged(drive->queue)) { | |
1093 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1094 | break; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * we know that the queue isn't empty, but this can happen | |
1099 | * if the q->prep_rq_fn() decides to kill a request | |
1100 | */ | |
1101 | rq = elv_next_request(drive->queue); | |
1102 | if (!rq) { | |
1103 | hwgroup->busy = 0; | |
1104 | break; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Sanity: don't accept a request that isn't a PM request | |
1109 | * if we are currently power managed. This is very important as | |
1110 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1111 | * above to return us whatever is in the queue. Since we call | |
1112 | * ide_do_request() ourselves, we end up taking requests while | |
1113 | * the queue is blocked... | |
1114 | * | |
1115 | * We let requests forced at head of queue with ide-preempt | |
1116 | * though. I hope that doesn't happen too much, hopefully not | |
1117 | * unless the subdriver triggers such a thing in its own PM | |
1118 | * state machine. | |
867f8b4e BH |
1119 | * |
1120 | * We count how many times we loop here to make sure we service | |
1121 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1122 | */ |
97100fc8 BZ |
1123 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
1124 | blk_pm_request(rq) == 0 && | |
1125 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
867f8b4e BH |
1126 | drive = drive->next ? drive->next : hwgroup->drive; |
1127 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1128 | goto again; | |
1da177e4 LT |
1129 | /* We clear busy, there should be no pending ATA command at this point. */ |
1130 | hwgroup->busy = 0; | |
1131 | break; | |
1132 | } | |
1133 | ||
1134 | hwgroup->rq = rq; | |
1135 | ||
1136 | /* | |
1137 | * Some systems have trouble with IDE IRQs arriving while | |
1138 | * the driver is still setting things up. So, here we disable | |
1139 | * the IRQ used by this interface while the request is being started. | |
1140 | * This may look bad at first, but pretty much the same thing | |
1141 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1142 | * -- the kernel masks the IRQ while it is being handled. | |
1143 | */ | |
1144 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1145 | disable_irq_nosync(hwif->irq); | |
1146 | spin_unlock(&ide_lock); | |
366c7f55 | 1147 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1148 | /* allow other IRQs while we start this request */ |
1149 | startstop = start_request(drive, rq); | |
1150 | spin_lock_irq(&ide_lock); | |
1151 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1152 | enable_irq(hwif->irq); | |
1153 | if (startstop == ide_stopped) | |
1154 | hwgroup->busy = 0; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * Passes the stuff to ide_do_request | |
1160 | */ | |
165125e1 | 1161 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1162 | { |
1163 | ide_drive_t *drive = q->queuedata; | |
1164 | ||
1165 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1170 | * retry the current request in pio mode instead of risking tossing it | |
1171 | * all away | |
1172 | */ | |
1173 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1174 | { | |
1175 | ide_hwif_t *hwif = HWIF(drive); | |
1176 | struct request *rq; | |
1177 | ide_startstop_t ret = ide_stopped; | |
1178 | ||
1179 | /* | |
1180 | * end current dma transaction | |
1181 | */ | |
1182 | ||
1183 | if (error < 0) { | |
1184 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1185 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1186 | ret = ide_error(drive, "dma timeout error", |
374e042c | 1187 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1188 | } else { |
1189 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1190 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1191 | } |
1192 | ||
1193 | /* | |
1194 | * disable dma for now, but remember that we did so because of | |
1195 | * a timeout -- we'll reenable after we finish this next request | |
1196 | * (or rather the first chunk of it) in pio. | |
1197 | */ | |
1198 | drive->retry_pio++; | |
1199 | drive->state = DMA_PIO_RETRY; | |
4a546e04 | 1200 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1201 | |
1202 | /* | |
1203 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1204 | * make sure request is sane | |
1205 | */ | |
1206 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1207 | |
1208 | if (!rq) | |
1209 | goto out; | |
1210 | ||
1da177e4 LT |
1211 | HWGROUP(drive)->rq = NULL; |
1212 | ||
1213 | rq->errors = 0; | |
1214 | ||
1215 | if (!rq->bio) | |
1216 | goto out; | |
1217 | ||
1218 | rq->sector = rq->bio->bi_sector; | |
1219 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1220 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1221 | rq->buffer = bio_data(rq->bio); | |
1222 | out: | |
1223 | return ret; | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1228 | * @data: timer callback magic (hwgroup) | |
1229 | * | |
1230 | * An IDE command has timed out before the expected drive return | |
1231 | * occurred. At this point we attempt to clean up the current | |
1232 | * mess. If the current handler includes an expiry handler then | |
1233 | * we invoke the expiry handler, and providing it is happy the | |
1234 | * work is done. If that fails we apply generic recovery rules | |
1235 | * invoking the handler and checking the drive DMA status. We | |
1236 | * have an excessively incestuous relationship with the DMA | |
1237 | * logic that wants cleaning up. | |
1238 | */ | |
1239 | ||
1240 | void ide_timer_expiry (unsigned long data) | |
1241 | { | |
1242 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1243 | ide_handler_t *handler; | |
1244 | ide_expiry_t *expiry; | |
1245 | unsigned long flags; | |
1246 | unsigned long wait = -1; | |
1247 | ||
1248 | spin_lock_irqsave(&ide_lock, flags); | |
1249 | ||
23450319 SS |
1250 | if (((handler = hwgroup->handler) == NULL) || |
1251 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1252 | /* |
1253 | * Either a marginal timeout occurred | |
1254 | * (got the interrupt just as timer expired), | |
1255 | * or we were "sleeping" to give other devices a chance. | |
1256 | * Either way, we don't really want to complain about anything. | |
1257 | */ | |
1258 | if (hwgroup->sleeping) { | |
1259 | hwgroup->sleeping = 0; | |
1260 | hwgroup->busy = 0; | |
1261 | } | |
1262 | } else { | |
1263 | ide_drive_t *drive = hwgroup->drive; | |
1264 | if (!drive) { | |
1265 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1266 | hwgroup->handler = NULL; | |
1267 | } else { | |
1268 | ide_hwif_t *hwif; | |
1269 | ide_startstop_t startstop = ide_stopped; | |
1270 | if (!hwgroup->busy) { | |
1271 | hwgroup->busy = 1; /* paranoia */ | |
1272 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1273 | } | |
1274 | if ((expiry = hwgroup->expiry) != NULL) { | |
1275 | /* continue */ | |
1276 | if ((wait = expiry(drive)) > 0) { | |
1277 | /* reset timer */ | |
1278 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1279 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1280 | add_timer(&hwgroup->timer); |
1281 | spin_unlock_irqrestore(&ide_lock, flags); | |
1282 | return; | |
1283 | } | |
1284 | } | |
1285 | hwgroup->handler = NULL; | |
1286 | /* | |
1287 | * We need to simulate a real interrupt when invoking | |
1288 | * the handler() function, which means we need to | |
1289 | * globally mask the specific IRQ: | |
1290 | */ | |
1291 | spin_unlock(&ide_lock); | |
1292 | hwif = HWIF(drive); | |
1da177e4 LT |
1293 | /* disable_irq_nosync ?? */ |
1294 | disable_irq(hwif->irq); | |
1da177e4 LT |
1295 | /* local CPU only, |
1296 | * as if we were handling an interrupt */ | |
1297 | local_irq_disable(); | |
1298 | if (hwgroup->polling) { | |
1299 | startstop = handler(drive); | |
1300 | } else if (drive_is_ready(drive)) { | |
1301 | if (drive->waiting_for_dma) | |
5e37bdc0 | 1302 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1303 | (void)ide_ack_intr(hwif); |
1304 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1305 | startstop = handler(drive); | |
1306 | } else { | |
1307 | if (drive->waiting_for_dma) { | |
1308 | startstop = ide_dma_timeout_retry(drive, wait); | |
1309 | } else | |
1310 | startstop = | |
c47137a9 | 1311 | ide_error(drive, "irq timeout", |
374e042c | 1312 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1313 | } |
1314 | drive->service_time = jiffies - drive->service_start; | |
1315 | spin_lock_irq(&ide_lock); | |
1316 | enable_irq(hwif->irq); | |
1317 | if (startstop == ide_stopped) | |
1318 | hwgroup->busy = 0; | |
1319 | } | |
1320 | } | |
1321 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1322 | spin_unlock_irqrestore(&ide_lock, flags); | |
1323 | } | |
1324 | ||
1325 | /** | |
1326 | * unexpected_intr - handle an unexpected IDE interrupt | |
1327 | * @irq: interrupt line | |
1328 | * @hwgroup: hwgroup being processed | |
1329 | * | |
1330 | * There's nothing really useful we can do with an unexpected interrupt, | |
1331 | * other than reading the status register (to clear it), and logging it. | |
1332 | * There should be no way that an irq can happen before we're ready for it, | |
1333 | * so we needn't worry much about losing an "important" interrupt here. | |
1334 | * | |
1335 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1336 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1337 | * looks "good", we just ignore the interrupt completely. | |
1338 | * | |
1339 | * This routine assumes __cli() is in effect when called. | |
1340 | * | |
1341 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1342 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1343 | * we could screw up by interfering with a new request being set up for | |
1344 | * irq15. | |
1345 | * | |
1346 | * In reality, this is a non-issue. The new command is not sent unless | |
1347 | * the drive is ready to accept one, in which case we know the drive is | |
1348 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1349 | * before completing the issuance of any new drive command, so we will not | |
1350 | * be accidentally invoked as a result of any valid command completion | |
1351 | * interrupt. | |
1352 | * | |
1353 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1354 | * is doing the current command, but we don't know which hwif burped | |
1355 | * mysteriously. | |
1356 | */ | |
1357 | ||
1358 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1359 | { | |
1360 | u8 stat; | |
1361 | ide_hwif_t *hwif = hwgroup->hwif; | |
1362 | ||
1363 | /* | |
1364 | * handle the unexpected interrupt | |
1365 | */ | |
1366 | do { | |
1367 | if (hwif->irq == irq) { | |
374e042c | 1368 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1369 | |
3a7d2484 | 1370 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1371 | /* Try to not flood the console with msgs */ |
1372 | static unsigned long last_msgtime, count; | |
1373 | ++count; | |
1374 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1375 | last_msgtime = jiffies; | |
1376 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1377 | "status=0x%02x, count=%ld\n", | |
1378 | hwif->name, | |
1379 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1380 | } | |
1381 | } | |
1382 | } | |
1383 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1384 | } | |
1385 | ||
1386 | /** | |
1387 | * ide_intr - default IDE interrupt handler | |
1388 | * @irq: interrupt number | |
1389 | * @dev_id: hwif group | |
1390 | * @regs: unused weirdness from the kernel irq layer | |
1391 | * | |
1392 | * This is the default IRQ handler for the IDE layer. You should | |
1393 | * not need to override it. If you do be aware it is subtle in | |
1394 | * places | |
1395 | * | |
1396 | * hwgroup->hwif is the interface in the group currently performing | |
1397 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1398 | * the IRQ handler to call. As we issue a command the handlers | |
1399 | * step through multiple states, reassigning the handler to the | |
1400 | * next step in the process. Unlike a smart SCSI controller IDE | |
1401 | * expects the main processor to sequence the various transfer | |
1402 | * stages. We also manage a poll timer to catch up with most | |
1403 | * timeout situations. There are still a few where the handlers | |
1404 | * don't ever decide to give up. | |
1405 | * | |
1406 | * The handler eventually returns ide_stopped to indicate the | |
1407 | * request completed. At this point we issue the next request | |
1408 | * on the hwgroup and the process begins again. | |
1409 | */ | |
1410 | ||
7d12e780 | 1411 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1412 | { |
1413 | unsigned long flags; | |
1414 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1415 | ide_hwif_t *hwif; | |
1416 | ide_drive_t *drive; | |
1417 | ide_handler_t *handler; | |
1418 | ide_startstop_t startstop; | |
1419 | ||
1420 | spin_lock_irqsave(&ide_lock, flags); | |
1421 | hwif = hwgroup->hwif; | |
1422 | ||
1423 | if (!ide_ack_intr(hwif)) { | |
1424 | spin_unlock_irqrestore(&ide_lock, flags); | |
1425 | return IRQ_NONE; | |
1426 | } | |
1427 | ||
1428 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1429 | /* | |
1430 | * Not expecting an interrupt from this drive. | |
1431 | * That means this could be: | |
1432 | * (1) an interrupt from another PCI device | |
1433 | * sharing the same PCI INT# as us. | |
1434 | * or (2) a drive just entered sleep or standby mode, | |
1435 | * and is interrupting to let us know. | |
1436 | * or (3) a spurious interrupt of unknown origin. | |
1437 | * | |
1438 | * For PCI, we cannot tell the difference, | |
1439 | * so in that case we just ignore it and hope it goes away. | |
1440 | * | |
1441 | * FIXME: unexpected_intr should be hwif-> then we can | |
1442 | * remove all the ifdef PCI crap | |
1443 | */ | |
1444 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1445 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1446 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1447 | { | |
1448 | /* | |
1449 | * Probably not a shared PCI interrupt, | |
1450 | * so we can safely try to do something about it: | |
1451 | */ | |
1452 | unexpected_intr(irq, hwgroup); | |
1453 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1454 | } else { | |
1455 | /* | |
1456 | * Whack the status register, just in case | |
1457 | * we have a leftover pending IRQ. | |
1458 | */ | |
374e042c | 1459 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1460 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1461 | } | |
1462 | spin_unlock_irqrestore(&ide_lock, flags); | |
1463 | return IRQ_NONE; | |
1464 | } | |
1465 | drive = hwgroup->drive; | |
1466 | if (!drive) { | |
1467 | /* | |
1468 | * This should NEVER happen, and there isn't much | |
1469 | * we could do about it here. | |
1470 | * | |
1471 | * [Note - this can occur if the drive is hot unplugged] | |
1472 | */ | |
1473 | spin_unlock_irqrestore(&ide_lock, flags); | |
1474 | return IRQ_HANDLED; | |
1475 | } | |
1476 | if (!drive_is_ready(drive)) { | |
1477 | /* | |
1478 | * This happens regularly when we share a PCI IRQ with | |
1479 | * another device. Unfortunately, it can also happen | |
1480 | * with some buggy drives that trigger the IRQ before | |
1481 | * their status register is up to date. Hopefully we have | |
1482 | * enough advance overhead that the latter isn't a problem. | |
1483 | */ | |
1484 | spin_unlock_irqrestore(&ide_lock, flags); | |
1485 | return IRQ_NONE; | |
1486 | } | |
1487 | if (!hwgroup->busy) { | |
1488 | hwgroup->busy = 1; /* paranoia */ | |
1489 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1490 | } | |
1491 | hwgroup->handler = NULL; | |
23450319 | 1492 | hwgroup->req_gen++; |
1da177e4 LT |
1493 | del_timer(&hwgroup->timer); |
1494 | spin_unlock(&ide_lock); | |
1495 | ||
f0dd8712 AL |
1496 | /* Some controllers might set DMA INTR no matter DMA or PIO; |
1497 | * bmdma status might need to be cleared even for | |
1498 | * PIO interrupts to prevent spurious/lost irq. | |
1499 | */ | |
1500 | if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma)) | |
1501 | /* ide_dma_end() needs bmdma status for error checking. | |
1502 | * So, skip clearing bmdma status here and leave it | |
1503 | * to ide_dma_end() if this is dma interrupt. | |
1504 | */ | |
1505 | hwif->ide_dma_clear_irq(drive); | |
1506 | ||
97100fc8 | 1507 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1508 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1509 | /* service this interrupt, may set handler for next interrupt */ |
1510 | startstop = handler(drive); | |
1511 | spin_lock_irq(&ide_lock); | |
1512 | ||
1513 | /* | |
1514 | * Note that handler() may have set things up for another | |
1515 | * interrupt to occur soon, but it cannot happen until | |
1516 | * we exit from this routine, because it will be the | |
1517 | * same irq as is currently being serviced here, and Linux | |
1518 | * won't allow another of the same (on any CPU) until we return. | |
1519 | */ | |
1520 | drive->service_time = jiffies - drive->service_start; | |
1521 | if (startstop == ide_stopped) { | |
1522 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1523 | hwgroup->busy = 0; | |
1524 | ide_do_request(hwgroup, hwif->irq); | |
1525 | } else { | |
1526 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1527 | "on exit\n", drive->name); | |
1528 | } | |
1529 | } | |
1530 | spin_unlock_irqrestore(&ide_lock, flags); | |
1531 | return IRQ_HANDLED; | |
1532 | } | |
1533 | ||
1da177e4 LT |
1534 | /** |
1535 | * ide_do_drive_cmd - issue IDE special command | |
1536 | * @drive: device to issue command | |
1537 | * @rq: request to issue | |
1da177e4 LT |
1538 | * |
1539 | * This function issues a special IDE device request | |
1540 | * onto the request queue. | |
1541 | * | |
63f5abb0 FT |
1542 | * the rq is queued at the head of the request queue, displacing |
1543 | * the currently-being-processed request and this function | |
1544 | * returns immediately without waiting for the new rq to be | |
1545 | * completed. This is VERY DANGEROUS, and is intended for | |
1546 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1547 | */ |
63f5abb0 FT |
1548 | |
1549 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 LT |
1550 | { |
1551 | unsigned long flags; | |
1552 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
e8a96aa7 | 1553 | |
1da177e4 | 1554 | spin_lock_irqsave(&ide_lock, flags); |
63f5abb0 FT |
1555 | hwgroup->rq = NULL; |
1556 | __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 1); | |
c6866a6f | 1557 | __generic_unplug_device(drive->queue); |
1da177e4 | 1558 | spin_unlock_irqrestore(&ide_lock, flags); |
1da177e4 LT |
1559 | } |
1560 | ||
1561 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1562 | |
1563 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1564 | { | |
6e6afb3b | 1565 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1566 | ide_task_t task; |
1567 | ||
1568 | memset(&task, 0, sizeof(task)); | |
1569 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1570 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1571 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1572 | task.tf.lbam = bcount & 0xff; | |
1573 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1574 | ||
089c5c7e | 1575 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1576 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1577 | SELECT_MASK(drive, 0); |
374e042c | 1578 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1579 | } |
1580 | ||
1581 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1582 | |
1583 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1584 | { | |
1585 | ide_hwif_t *hwif = drive->hwif; | |
1586 | u8 buf[4] = { 0 }; | |
1587 | ||
1588 | while (len > 0) { | |
1589 | if (write) | |
374e042c | 1590 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1591 | else |
374e042c | 1592 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1593 | len -= 4; |
1594 | } | |
1595 | } | |
1596 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |