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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 | */ | |
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 | ||
1da177e4 LT |
135 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error) |
136 | { | |
c00895ab | 137 | struct request_pm_state *pm = rq->data; |
ad3cadda | 138 | |
1da177e4 LT |
139 | if (drive->media != ide_disk) |
140 | return; | |
141 | ||
ad3cadda | 142 | switch (pm->pm_step) { |
0d346ba0 | 143 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
ad3cadda | 144 | if (pm->pm_state == PM_EVENT_FREEZE) |
0d346ba0 | 145 | pm->pm_step = IDE_PM_COMPLETED; |
1da177e4 | 146 | else |
0d346ba0 | 147 | pm->pm_step = IDE_PM_STANDBY; |
1da177e4 | 148 | break; |
0d346ba0 BZ |
149 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
150 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 151 | break; |
0d346ba0 BZ |
152 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
153 | pm->pm_step = IDE_PM_IDLE; | |
8c2c0118 | 154 | break; |
0d346ba0 BZ |
155 | case IDE_PM_IDLE: /* Resume step 2 (idle)*/ |
156 | pm->pm_step = IDE_PM_RESTORE_DMA; | |
1da177e4 LT |
157 | break; |
158 | } | |
159 | } | |
160 | ||
161 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
162 | { | |
c00895ab | 163 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
164 | ide_task_t *args = rq->special; |
165 | ||
166 | memset(args, 0, sizeof(*args)); | |
167 | ||
ad3cadda | 168 | switch (pm->pm_step) { |
0d346ba0 | 169 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
1da177e4 LT |
170 | if (drive->media != ide_disk) |
171 | break; | |
172 | /* Not supported? Switch to next step now. */ | |
97100fc8 BZ |
173 | if (ata_id_flush_enabled(drive->id) == 0 || |
174 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { | |
1da177e4 LT |
175 | ide_complete_power_step(drive, rq, 0, 0); |
176 | return ide_stopped; | |
177 | } | |
ff2779b5 | 178 | if (ata_id_flush_ext_enabled(drive->id)) |
aaaade3f | 179 | args->tf.command = ATA_CMD_FLUSH_EXT; |
1da177e4 | 180 | else |
aaaade3f | 181 | args->tf.command = ATA_CMD_FLUSH; |
74095a91 | 182 | goto out_do_tf; |
0d346ba0 | 183 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
aaaade3f | 184 | args->tf.command = ATA_CMD_STANDBYNOW1; |
74095a91 | 185 | goto out_do_tf; |
0d346ba0 | 186 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
26bcb879 | 187 | ide_set_max_pio(drive); |
317a46a2 | 188 | /* |
0d346ba0 | 189 | * skip IDE_PM_IDLE for ATAPI devices |
317a46a2 BZ |
190 | */ |
191 | if (drive->media != ide_disk) | |
0d346ba0 | 192 | pm->pm_step = IDE_PM_RESTORE_DMA; |
317a46a2 BZ |
193 | else |
194 | ide_complete_power_step(drive, rq, 0, 0); | |
8c2c0118 | 195 | return ide_stopped; |
0d346ba0 | 196 | case IDE_PM_IDLE: /* Resume step 2 (idle) */ |
aaaade3f | 197 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
74095a91 | 198 | goto out_do_tf; |
0d346ba0 | 199 | case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ |
1da177e4 | 200 | /* |
0ae2e178 | 201 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
202 | * we could be smarter and check for current xfer_speed |
203 | * in struct drive etc... | |
204 | */ | |
5e37bdc0 | 205 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 206 | break; |
e9eb8388 BZ |
207 | if (drive->dev_flags & IDE_DFLAG_USING_DMA) |
208 | ide_set_dma(drive); | |
1da177e4 LT |
209 | break; |
210 | } | |
0d346ba0 BZ |
211 | |
212 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 213 | return ide_stopped; |
74095a91 BZ |
214 | |
215 | out_do_tf: | |
657cc1a8 | 216 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 217 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 218 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
219 | } |
220 | ||
dbe217af AC |
221 | /** |
222 | * ide_end_dequeued_request - complete an IDE I/O | |
223 | * @drive: IDE device for the I/O | |
224 | * @uptodate: | |
225 | * @nr_sectors: number of sectors completed | |
226 | * | |
227 | * Complete an I/O that is no longer on the request queue. This | |
228 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
229 | * We must still finish the old request but we must not tamper with the | |
230 | * queue in the meantime. | |
231 | * | |
232 | * NOTE: This path does not handle barrier, but barrier is not supported | |
233 | * on ide-cd anyway. | |
234 | */ | |
235 | ||
236 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
237 | int uptodate, int nr_sectors) | |
238 | { | |
239 | unsigned long flags; | |
bbc615b1 | 240 | int ret; |
dbe217af AC |
241 | |
242 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 243 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 244 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 245 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 246 | |
dbe217af AC |
247 | return ret; |
248 | } | |
249 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
250 | ||
251 | ||
1da177e4 LT |
252 | /** |
253 | * ide_complete_pm_request - end the current Power Management request | |
254 | * @drive: target drive | |
255 | * @rq: request | |
256 | * | |
257 | * This function cleans up the current PM request and stops the queue | |
258 | * if necessary. | |
259 | */ | |
260 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
261 | { | |
262 | unsigned long flags; | |
263 | ||
264 | #ifdef DEBUG_PM | |
265 | printk("%s: completing PM request, %s\n", drive->name, | |
266 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
267 | #endif | |
268 | spin_lock_irqsave(&ide_lock, flags); | |
269 | if (blk_pm_suspend_request(rq)) { | |
270 | blk_stop_queue(drive->queue); | |
271 | } else { | |
97100fc8 | 272 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
1da177e4 LT |
273 | blk_start_queue(drive->queue); |
274 | } | |
1da177e4 | 275 | HWGROUP(drive)->rq = NULL; |
5e36bb6e KU |
276 | if (__blk_end_request(rq, 0, 0)) |
277 | BUG(); | |
1da177e4 LT |
278 | spin_unlock_irqrestore(&ide_lock, flags); |
279 | } | |
280 | ||
1da177e4 LT |
281 | /** |
282 | * ide_end_drive_cmd - end an explicit drive command | |
283 | * @drive: command | |
284 | * @stat: status bits | |
285 | * @err: error bits | |
286 | * | |
287 | * Clean up after success/failure of an explicit drive command. | |
288 | * These get thrown onto the queue so they are synchronized with | |
289 | * real I/O operations on the drive. | |
290 | * | |
291 | * In LBA48 mode we have to read the register set twice to get | |
292 | * all the extra information out. | |
293 | */ | |
294 | ||
295 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
296 | { | |
1da177e4 LT |
297 | unsigned long flags; |
298 | struct request *rq; | |
299 | ||
300 | spin_lock_irqsave(&ide_lock, flags); | |
301 | rq = HWGROUP(drive)->rq; | |
302 | spin_unlock_irqrestore(&ide_lock, flags); | |
303 | ||
7267c337 | 304 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
305 | ide_task_t *task = (ide_task_t *)rq->special; |
306 | ||
1da177e4 | 307 | if (rq->errors == 0) |
3a7d2484 | 308 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
395d8ef5 BZ |
309 | |
310 | if (task) { | |
311 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 312 | |
650d841d | 313 | tf->error = err; |
650d841d | 314 | tf->status = stat; |
1da177e4 | 315 | |
374e042c | 316 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
317 | |
318 | if (task->tf_flags & IDE_TFLAG_DYN) | |
319 | kfree(task); | |
1da177e4 LT |
320 | } |
321 | } else if (blk_pm_request(rq)) { | |
c00895ab | 322 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
323 | #ifdef DEBUG_PM |
324 | printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", | |
325 | drive->name, rq->pm->pm_step, stat, err); | |
326 | #endif | |
327 | ide_complete_power_step(drive, rq, stat, err); | |
0d346ba0 | 328 | if (pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
329 | ide_complete_pm_request(drive, rq); |
330 | return; | |
331 | } | |
332 | ||
333 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
334 | HWGROUP(drive)->rq = NULL; |
335 | rq->errors = err; | |
3b0e044d KU |
336 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
337 | blk_rq_bytes(rq)))) | |
5e36bb6e | 338 | BUG(); |
1da177e4 LT |
339 | spin_unlock_irqrestore(&ide_lock, flags); |
340 | } | |
341 | ||
342 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
343 | ||
1da177e4 LT |
344 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
345 | { | |
346 | if (rq->rq_disk) { | |
347 | ide_driver_t *drv; | |
348 | ||
349 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
350 | drv->end_request(drive, 0, 0); | |
351 | } else | |
352 | ide_end_request(drive, 0, 0); | |
353 | } | |
354 | ||
355 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
356 | { | |
357 | ide_hwif_t *hwif = drive->hwif; | |
358 | ||
97100fc8 BZ |
359 | if ((stat & ATA_BUSY) || |
360 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
361 | /* other bits are useless when BUSY */ |
362 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 363 | } else if (stat & ATA_ERR) { |
1da177e4 | 364 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 365 | if (err == ATA_ABORTED) { |
d1d76714 | 366 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
367 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
368 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
369 | return ide_stopped; |
370 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
371 | /* UDMA crc error, just retry the operation */ | |
372 | drive->crc_count++; | |
3a7d2484 | 373 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
374 | /* retries won't help these */ |
375 | rq->errors = ERROR_MAX; | |
3a7d2484 | 376 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
377 | /* help it find track zero */ |
378 | rq->errors |= ERROR_RECAL; | |
379 | } | |
380 | } | |
381 | ||
3a7d2484 | 382 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
383 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
384 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
385 | ||
386 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
387 | } | |
1da177e4 | 388 | |
513daadd SS |
389 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
390 | ide_kill_rq(drive, rq); | |
391 | return ide_stopped; | |
392 | } | |
393 | ||
3a7d2484 | 394 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 395 | rq->errors |= ERROR_RESET; |
1da177e4 | 396 | |
513daadd | 397 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 398 | ++rq->errors; |
513daadd | 399 | return ide_do_reset(drive); |
1da177e4 | 400 | } |
513daadd SS |
401 | |
402 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
403 | drive->special.b.recalibrate = 1; | |
404 | ||
405 | ++rq->errors; | |
406 | ||
1da177e4 LT |
407 | return ide_stopped; |
408 | } | |
409 | ||
410 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
411 | { | |
412 | ide_hwif_t *hwif = drive->hwif; | |
413 | ||
97100fc8 BZ |
414 | if ((stat & ATA_BUSY) || |
415 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
416 | /* other bits are useless when BUSY */ |
417 | rq->errors |= ERROR_RESET; | |
418 | } else { | |
419 | /* add decoding error stuff */ | |
420 | } | |
421 | ||
3a7d2484 | 422 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 423 | /* force an abort */ |
aaaade3f | 424 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
425 | |
426 | if (rq->errors >= ERROR_MAX) { | |
427 | ide_kill_rq(drive, rq); | |
428 | } else { | |
429 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
430 | ++rq->errors; | |
431 | return ide_do_reset(drive); | |
432 | } | |
433 | ++rq->errors; | |
434 | } | |
435 | ||
436 | return ide_stopped; | |
437 | } | |
438 | ||
439 | ide_startstop_t | |
440 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
441 | { | |
442 | if (drive->media == ide_disk) | |
443 | return ide_ata_error(drive, rq, stat, err); | |
444 | return ide_atapi_error(drive, rq, stat, err); | |
445 | } | |
446 | ||
447 | EXPORT_SYMBOL_GPL(__ide_error); | |
448 | ||
449 | /** | |
450 | * ide_error - handle an error on the IDE | |
451 | * @drive: drive the error occurred on | |
452 | * @msg: message to report | |
453 | * @stat: status bits | |
454 | * | |
455 | * ide_error() takes action based on the error returned by the drive. | |
456 | * For normal I/O that may well include retries. We deal with | |
457 | * both new-style (taskfile) and old style command handling here. | |
458 | * In the case of taskfile command handling there is work left to | |
459 | * do | |
460 | */ | |
461 | ||
462 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
463 | { | |
464 | struct request *rq; | |
465 | u8 err; | |
466 | ||
467 | err = ide_dump_status(drive, msg, stat); | |
468 | ||
469 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
470 | return ide_stopped; | |
471 | ||
472 | /* retry only "normal" I/O: */ | |
4aff5e23 | 473 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
474 | rq->errors = 1; |
475 | ide_end_drive_cmd(drive, stat, err); | |
476 | return ide_stopped; | |
477 | } | |
478 | ||
479 | if (rq->rq_disk) { | |
480 | ide_driver_t *drv; | |
481 | ||
482 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
483 | return drv->error(drive, rq, stat, err); | |
484 | } else | |
485 | return __ide_error(drive, rq, stat, err); | |
486 | } | |
487 | ||
488 | EXPORT_SYMBOL_GPL(ide_error); | |
489 | ||
57d7366b | 490 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 491 | { |
57d7366b BZ |
492 | tf->nsect = drive->sect; |
493 | tf->lbal = drive->sect; | |
494 | tf->lbam = drive->cyl; | |
495 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 496 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 497 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
498 | } |
499 | ||
57d7366b | 500 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 501 | { |
57d7366b | 502 | tf->nsect = drive->sect; |
aaaade3f | 503 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
504 | } |
505 | ||
57d7366b | 506 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 507 | { |
57d7366b | 508 | tf->nsect = drive->mult_req; |
aaaade3f | 509 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
510 | } |
511 | ||
512 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
513 | { | |
514 | special_t *s = &drive->special; | |
515 | ide_task_t args; | |
516 | ||
517 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 518 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
519 | |
520 | if (s->b.set_geometry) { | |
521 | s->b.set_geometry = 0; | |
57d7366b | 522 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
523 | } else if (s->b.recalibrate) { |
524 | s->b.recalibrate = 0; | |
57d7366b | 525 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
526 | } else if (s->b.set_multmode) { |
527 | s->b.set_multmode = 0; | |
57d7366b | 528 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
529 | } else if (s->all) { |
530 | int special = s->all; | |
531 | s->all = 0; | |
532 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
533 | return ide_stopped; | |
534 | } | |
535 | ||
657cc1a8 | 536 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 537 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 538 | |
1da177e4 LT |
539 | do_rw_taskfile(drive, &args); |
540 | ||
541 | return ide_started; | |
542 | } | |
543 | ||
544 | /** | |
545 | * do_special - issue some special commands | |
546 | * @drive: drive the command is for | |
547 | * | |
aaaade3f BZ |
548 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
549 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
550 | * | |
551 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
552 | */ |
553 | ||
554 | static ide_startstop_t do_special (ide_drive_t *drive) | |
555 | { | |
556 | special_t *s = &drive->special; | |
557 | ||
558 | #ifdef DEBUG | |
559 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
560 | #endif | |
6982daf7 BZ |
561 | if (drive->media == ide_disk) |
562 | return ide_disk_special(drive); | |
1da177e4 | 563 | |
6982daf7 BZ |
564 | s->all = 0; |
565 | drive->mult_req = 0; | |
566 | return ide_stopped; | |
1da177e4 LT |
567 | } |
568 | ||
569 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
570 | { | |
571 | ide_hwif_t *hwif = drive->hwif; | |
572 | struct scatterlist *sg = hwif->sg_table; | |
573 | ||
574 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
575 | return; | |
576 | ||
4aff5e23 | 577 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
578 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
579 | } else { | |
580 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
581 | hwif->sg_nents = 1; | |
582 | } | |
583 | } | |
584 | ||
585 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
586 | ||
587 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
588 | { | |
589 | ide_hwif_t *hwif = drive->hwif; | |
590 | ||
591 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
592 | hwif->cursg_ofs = 0; |
593 | hwif->cursg = NULL; | |
1da177e4 LT |
594 | } |
595 | ||
596 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
597 | ||
598 | /** | |
599 | * execute_drive_command - issue special drive command | |
338cec32 | 600 | * @drive: the drive to issue the command on |
1da177e4 LT |
601 | * @rq: the request structure holding the command |
602 | * | |
603 | * execute_drive_cmd() issues a special drive command, usually | |
604 | * initiated by ioctl() from the external hdparm program. The | |
605 | * command can be a drive command, drive task or taskfile | |
606 | * operation. Weirdly you can call it with NULL to wait for | |
607 | * all commands to finish. Don't do this as that is due to change | |
608 | */ | |
609 | ||
610 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
611 | struct request *rq) | |
612 | { | |
613 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 614 | ide_task_t *task = rq->special; |
1da177e4 | 615 | |
7267c337 | 616 | if (task) { |
21d535c9 | 617 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
618 | |
619 | switch (hwif->data_phase) { | |
620 | case TASKFILE_MULTI_OUT: | |
621 | case TASKFILE_OUT: | |
622 | case TASKFILE_MULTI_IN: | |
623 | case TASKFILE_IN: | |
624 | ide_init_sg_cmd(drive, rq); | |
625 | ide_map_sg(drive, rq); | |
626 | default: | |
627 | break; | |
628 | } | |
74095a91 | 629 | |
21d535c9 BZ |
630 | return do_rw_taskfile(drive, task); |
631 | } | |
632 | ||
1da177e4 LT |
633 | /* |
634 | * NULL is actually a valid way of waiting for | |
635 | * all current requests to be flushed from the queue. | |
636 | */ | |
637 | #ifdef DEBUG | |
638 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
639 | #endif | |
374e042c | 640 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 641 | ide_read_error(drive)); |
64a57fe4 | 642 | |
1da177e4 LT |
643 | return ide_stopped; |
644 | } | |
645 | ||
92f1f8fd EO |
646 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
647 | int arg) | |
648 | { | |
649 | struct request_queue *q = drive->queue; | |
650 | struct request *rq; | |
651 | int ret = 0; | |
652 | ||
653 | if (!(setting->flags & DS_SYNC)) | |
654 | return setting->set(drive, arg); | |
655 | ||
e415e495 | 656 | rq = blk_get_request(q, READ, __GFP_WAIT); |
92f1f8fd EO |
657 | rq->cmd_type = REQ_TYPE_SPECIAL; |
658 | rq->cmd_len = 5; | |
659 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
660 | *(int *)&rq->cmd[1] = arg; | |
661 | rq->special = setting->set; | |
662 | ||
663 | if (blk_execute_rq(q, NULL, rq, 0)) | |
664 | ret = rq->errors; | |
665 | blk_put_request(rq); | |
666 | ||
667 | return ret; | |
668 | } | |
669 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
670 | ||
79e36a9f EO |
671 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
672 | { | |
4abdc6ee EO |
673 | u8 cmd = rq->cmd[0]; |
674 | ||
675 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { | |
676 | ide_task_t task; | |
677 | struct ide_taskfile *tf = &task.tf; | |
678 | ||
679 | memset(&task, 0, sizeof(task)); | |
680 | if (cmd == REQ_PARK_HEADS) { | |
681 | drive->sleep = *(unsigned long *)rq->special; | |
682 | drive->dev_flags |= IDE_DFLAG_SLEEPING; | |
683 | tf->command = ATA_CMD_IDLEIMMEDIATE; | |
684 | tf->feature = 0x44; | |
685 | tf->lbal = 0x4c; | |
686 | tf->lbam = 0x4e; | |
687 | tf->lbah = 0x55; | |
688 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; | |
689 | } else /* cmd == REQ_UNPARK_HEADS */ | |
690 | tf->command = ATA_CMD_CHK_POWER; | |
691 | ||
692 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; | |
693 | task.rq = rq; | |
694 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; | |
695 | return do_rw_taskfile(drive, &task); | |
696 | } | |
697 | ||
698 | switch (cmd) { | |
92f1f8fd EO |
699 | case REQ_DEVSET_EXEC: |
700 | { | |
701 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
702 | ||
703 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
704 | if (err) | |
705 | rq->errors = err; | |
706 | else | |
707 | err = 1; | |
708 | ide_end_request(drive, err, 0); | |
709 | return ide_stopped; | |
710 | } | |
79e36a9f EO |
711 | case REQ_DRIVE_RESET: |
712 | return ide_do_reset(drive); | |
713 | default: | |
714 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
715 | ide_end_request(drive, 0, 0); | |
716 | return ide_stopped; | |
717 | } | |
718 | } | |
719 | ||
ad3cadda JA |
720 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
721 | { | |
c00895ab | 722 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
723 | |
724 | if (blk_pm_suspend_request(rq) && | |
0d346ba0 | 725 | pm->pm_step == IDE_PM_START_SUSPEND) |
ad3cadda | 726 | /* Mark drive blocked when starting the suspend sequence. */ |
97100fc8 | 727 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
ad3cadda | 728 | else if (blk_pm_resume_request(rq) && |
0d346ba0 | 729 | pm->pm_step == IDE_PM_START_RESUME) { |
ad3cadda JA |
730 | /* |
731 | * The first thing we do on wakeup is to wait for BSY bit to | |
732 | * go away (with a looong timeout) as a drive on this hwif may | |
733 | * just be POSTing itself. | |
734 | * We do that before even selecting as the "other" device on | |
735 | * the bus may be broken enough to walk on our toes at this | |
736 | * point. | |
737 | */ | |
6e6afb3b | 738 | ide_hwif_t *hwif = drive->hwif; |
ad3cadda JA |
739 | int rc; |
740 | #ifdef DEBUG_PM | |
741 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
742 | #endif | |
6e6afb3b | 743 | rc = ide_wait_not_busy(hwif, 35000); |
ad3cadda JA |
744 | if (rc) |
745 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
746 | SELECT_DRIVE(drive); | |
374e042c | 747 | hwif->tp_ops->set_irq(hwif, 1); |
6e6afb3b | 748 | rc = ide_wait_not_busy(hwif, 100000); |
ad3cadda JA |
749 | if (rc) |
750 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
751 | } | |
752 | } | |
753 | ||
1da177e4 LT |
754 | /** |
755 | * start_request - start of I/O and command issuing for IDE | |
756 | * | |
757 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 758 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
759 | * |
760 | * FIXME: this function needs a rename | |
761 | */ | |
762 | ||
763 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
764 | { | |
765 | ide_startstop_t startstop; | |
1da177e4 | 766 | |
4aff5e23 | 767 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
768 | |
769 | #ifdef DEBUG | |
770 | printk("%s: start_request: current=0x%08lx\n", | |
771 | HWIF(drive)->name, (unsigned long) rq); | |
772 | #endif | |
773 | ||
774 | /* bail early if we've exceeded max_failures */ | |
775 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 776 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
777 | goto kill_rq; |
778 | } | |
779 | ||
ad3cadda JA |
780 | if (blk_pm_request(rq)) |
781 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
782 | |
783 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
784 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
785 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
786 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
787 | return startstop; | |
788 | } | |
789 | if (!drive->special.all) { | |
790 | ide_driver_t *drv; | |
791 | ||
513daadd SS |
792 | /* |
793 | * We reset the drive so we need to issue a SETFEATURES. | |
794 | * Do it _after_ do_special() restored device parameters. | |
795 | */ | |
796 | if (drive->current_speed == 0xff) | |
797 | ide_config_drive_speed(drive, drive->desired_speed); | |
798 | ||
7267c337 | 799 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
800 | return execute_drive_cmd(drive, rq); |
801 | else if (blk_pm_request(rq)) { | |
c00895ab | 802 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
803 | #ifdef DEBUG_PM |
804 | printk("%s: start_power_step(step: %d)\n", | |
805 | drive->name, rq->pm->pm_step); | |
806 | #endif | |
807 | startstop = ide_start_power_step(drive, rq); | |
808 | if (startstop == ide_stopped && | |
0d346ba0 | 809 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
810 | ide_complete_pm_request(drive, rq); |
811 | return startstop; | |
79e36a9f EO |
812 | } else if (!rq->rq_disk && blk_special_request(rq)) |
813 | /* | |
814 | * TODO: Once all ULDs have been modified to | |
815 | * check for specific op codes rather than | |
816 | * blindly accepting any special request, the | |
817 | * check for ->rq_disk above may be replaced | |
818 | * by a more suitable mechanism or even | |
819 | * dropped entirely. | |
820 | */ | |
821 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
822 | |
823 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
824 | |
825 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
826 | } |
827 | return do_special(drive); | |
828 | kill_rq: | |
829 | ide_kill_rq(drive, rq); | |
830 | return ide_stopped; | |
831 | } | |
832 | ||
833 | /** | |
834 | * ide_stall_queue - pause an IDE device | |
835 | * @drive: drive to stall | |
836 | * @timeout: time to stall for (jiffies) | |
837 | * | |
838 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
839 | * to the hwgroup by sleeping for timeout jiffies. | |
840 | */ | |
841 | ||
842 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
843 | { | |
844 | if (timeout > WAIT_WORSTCASE) | |
845 | timeout = WAIT_WORSTCASE; | |
846 | drive->sleep = timeout + jiffies; | |
97100fc8 | 847 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 LT |
848 | } |
849 | ||
850 | EXPORT_SYMBOL(ide_stall_queue); | |
851 | ||
852 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
853 | ||
854 | /** | |
855 | * choose_drive - select a drive to service | |
856 | * @hwgroup: hardware group to select on | |
857 | * | |
858 | * choose_drive() selects the next drive which will be serviced. | |
859 | * This is necessary because the IDE layer can't issue commands | |
860 | * to both drives on the same cable, unlike SCSI. | |
861 | */ | |
862 | ||
863 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
864 | { | |
865 | ide_drive_t *drive, *best; | |
866 | ||
867 | repeat: | |
868 | best = NULL; | |
869 | drive = hwgroup->drive; | |
870 | ||
871 | /* | |
872 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
873 | * though that is 3 requests, it must be seen as a single transaction. | |
874 | * we must not preempt this drive until that is complete | |
875 | */ | |
876 | if (blk_queue_flushing(drive->queue)) { | |
877 | /* | |
878 | * small race where queue could get replugged during | |
879 | * the 3-request flush cycle, just yank the plug since | |
880 | * we want it to finish asap | |
881 | */ | |
882 | blk_remove_plug(drive->queue); | |
883 | return drive; | |
884 | } | |
885 | ||
886 | do { | |
97100fc8 BZ |
887 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
888 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); | |
889 | ||
890 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && | |
891 | !elv_queue_empty(drive->queue)) { | |
892 | if (best == NULL || | |
893 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || | |
894 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { | |
1da177e4 LT |
895 | if (!blk_queue_plugged(drive->queue)) |
896 | best = drive; | |
897 | } | |
898 | } | |
899 | } while ((drive = drive->next) != hwgroup->drive); | |
97100fc8 BZ |
900 | |
901 | if (best && (best->dev_flags & IDE_DFLAG_NICE1) && | |
902 | (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 && | |
903 | best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1da177e4 LT |
904 | long t = (signed long)(WAKEUP(best) - jiffies); |
905 | if (t >= WAIT_MIN_SLEEP) { | |
906 | /* | |
907 | * We *may* have some time to spare, but first let's see if | |
908 | * someone can potentially benefit from our nice mood today.. | |
909 | */ | |
910 | drive = best->next; | |
911 | do { | |
97100fc8 | 912 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
1da177e4 LT |
913 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
914 | && time_before(WAKEUP(drive), jiffies + t)) | |
915 | { | |
916 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
917 | goto repeat; | |
918 | } | |
919 | } while ((drive = drive->next) != best); | |
920 | } | |
921 | } | |
922 | return best; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Issue a new request to a drive from hwgroup | |
927 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
928 | * | |
929 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
930 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
931 | * may have both interfaces in a single hwgroup to "serialize" access. | |
932 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
933 | * together into one hwgroup for serialized access. | |
934 | * | |
935 | * Note also that several hwgroups can end up sharing a single IRQ, | |
936 | * possibly along with many other devices. This is especially common in | |
937 | * PCI-based systems with off-board IDE controller cards. | |
938 | * | |
939 | * The IDE driver uses the single global ide_lock spinlock to protect | |
940 | * access to the request queues, and to protect the hwgroup->busy flag. | |
941 | * | |
942 | * The first thread into the driver for a particular hwgroup sets the | |
943 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
944 | * and then initiates processing of the top request from the request queue. | |
945 | * | |
946 | * Other threads attempting entry notice the busy setting, and will simply | |
947 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
948 | * remains set even when the driver is merely awaiting the next interrupt. | |
949 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
950 | * | |
951 | * When processing of a request completes, the completing thread or IRQ-handler | |
952 | * will start the next request from the queue. If no more work remains, | |
953 | * the driver will clear the hwgroup->busy flag and exit. | |
954 | * | |
955 | * The ide_lock (spinlock) is used to protect all access to the | |
956 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
957 | * the driver. This makes the driver much more friendlier to shared IRQs | |
958 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
959 | */ | |
960 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
961 | { | |
962 | ide_drive_t *drive; | |
963 | ide_hwif_t *hwif; | |
964 | struct request *rq; | |
965 | ide_startstop_t startstop; | |
867f8b4e | 966 | int loops = 0; |
1da177e4 | 967 | |
1da177e4 LT |
968 | /* caller must own ide_lock */ |
969 | BUG_ON(!irqs_disabled()); | |
970 | ||
971 | while (!hwgroup->busy) { | |
972 | hwgroup->busy = 1; | |
f9e3326d MS |
973 | /* for atari only */ |
974 | ide_get_lock(ide_intr, hwgroup); | |
1da177e4 LT |
975 | drive = choose_drive(hwgroup); |
976 | if (drive == NULL) { | |
977 | int sleeping = 0; | |
978 | unsigned long sleep = 0; /* shut up, gcc */ | |
979 | hwgroup->rq = NULL; | |
980 | drive = hwgroup->drive; | |
981 | do { | |
97100fc8 BZ |
982 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
983 | (sleeping == 0 || | |
984 | time_before(drive->sleep, sleep))) { | |
1da177e4 LT |
985 | sleeping = 1; |
986 | sleep = drive->sleep; | |
987 | } | |
988 | } while ((drive = drive->next) != hwgroup->drive); | |
989 | if (sleeping) { | |
990 | /* | |
991 | * Take a short snooze, and then wake up this hwgroup again. | |
992 | * This gives other hwgroups on the same a chance to | |
993 | * play fairly with us, just in case there are big differences | |
994 | * in relative throughputs.. don't want to hog the cpu too much. | |
995 | */ | |
996 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
997 | sleep = jiffies + WAIT_MIN_SLEEP; | |
998 | #if 1 | |
999 | if (timer_pending(&hwgroup->timer)) | |
1000 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1001 | #endif | |
1002 | /* so that ide_timer_expiry knows what to do */ | |
1003 | hwgroup->sleeping = 1; | |
23450319 | 1004 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1005 | mod_timer(&hwgroup->timer, sleep); |
1006 | /* we purposely leave hwgroup->busy==1 | |
1007 | * while sleeping */ | |
1008 | } else { | |
1009 | /* Ugly, but how can we sleep for the lock | |
1010 | * otherwise? perhaps from tq_disk? | |
1011 | */ | |
1012 | ||
1013 | /* for atari only */ | |
1014 | ide_release_lock(); | |
1015 | hwgroup->busy = 0; | |
1016 | } | |
1017 | ||
1018 | /* no more work for this hwgroup (for now) */ | |
1019 | return; | |
1020 | } | |
867f8b4e | 1021 | again: |
1da177e4 | 1022 | hwif = HWIF(drive); |
81ca6919 | 1023 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1024 | /* |
1025 | * set nIEN for previous hwif, drives in the | |
1026 | * quirk_list may not like intr setups/cleanups | |
1027 | */ | |
1028 | if (drive->quirk_list != 1) | |
374e042c | 1029 | hwif->tp_ops->set_irq(hwif, 0); |
1da177e4 LT |
1030 | } |
1031 | hwgroup->hwif = hwif; | |
1032 | hwgroup->drive = drive; | |
4abdc6ee | 1033 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 LT |
1034 | drive->service_start = jiffies; |
1035 | ||
1036 | if (blk_queue_plugged(drive->queue)) { | |
1037 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1038 | break; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * we know that the queue isn't empty, but this can happen | |
1043 | * if the q->prep_rq_fn() decides to kill a request | |
1044 | */ | |
1045 | rq = elv_next_request(drive->queue); | |
1046 | if (!rq) { | |
1047 | hwgroup->busy = 0; | |
1048 | break; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Sanity: don't accept a request that isn't a PM request | |
1053 | * if we are currently power managed. This is very important as | |
1054 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1055 | * above to return us whatever is in the queue. Since we call | |
1056 | * ide_do_request() ourselves, we end up taking requests while | |
1057 | * the queue is blocked... | |
1058 | * | |
1059 | * We let requests forced at head of queue with ide-preempt | |
1060 | * though. I hope that doesn't happen too much, hopefully not | |
1061 | * unless the subdriver triggers such a thing in its own PM | |
1062 | * state machine. | |
867f8b4e BH |
1063 | * |
1064 | * We count how many times we loop here to make sure we service | |
1065 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1066 | */ |
97100fc8 BZ |
1067 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
1068 | blk_pm_request(rq) == 0 && | |
1069 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
867f8b4e BH |
1070 | drive = drive->next ? drive->next : hwgroup->drive; |
1071 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1072 | goto again; | |
1da177e4 LT |
1073 | /* We clear busy, there should be no pending ATA command at this point. */ |
1074 | hwgroup->busy = 0; | |
1075 | break; | |
1076 | } | |
1077 | ||
1078 | hwgroup->rq = rq; | |
1079 | ||
1080 | /* | |
1081 | * Some systems have trouble with IDE IRQs arriving while | |
1082 | * the driver is still setting things up. So, here we disable | |
1083 | * the IRQ used by this interface while the request is being started. | |
1084 | * This may look bad at first, but pretty much the same thing | |
1085 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1086 | * -- the kernel masks the IRQ while it is being handled. | |
1087 | */ | |
1088 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1089 | disable_irq_nosync(hwif->irq); | |
1090 | spin_unlock(&ide_lock); | |
366c7f55 | 1091 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1092 | /* allow other IRQs while we start this request */ |
1093 | startstop = start_request(drive, rq); | |
1094 | spin_lock_irq(&ide_lock); | |
1095 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1096 | enable_irq(hwif->irq); | |
1097 | if (startstop == ide_stopped) | |
1098 | hwgroup->busy = 0; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Passes the stuff to ide_do_request | |
1104 | */ | |
165125e1 | 1105 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1106 | { |
1107 | ide_drive_t *drive = q->queuedata; | |
1108 | ||
1109 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1114 | * retry the current request in pio mode instead of risking tossing it | |
1115 | * all away | |
1116 | */ | |
1117 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1118 | { | |
1119 | ide_hwif_t *hwif = HWIF(drive); | |
1120 | struct request *rq; | |
1121 | ide_startstop_t ret = ide_stopped; | |
1122 | ||
1123 | /* | |
1124 | * end current dma transaction | |
1125 | */ | |
1126 | ||
1127 | if (error < 0) { | |
1128 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1129 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1130 | ret = ide_error(drive, "dma timeout error", |
374e042c | 1131 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1132 | } else { |
1133 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1134 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | /* | |
1138 | * disable dma for now, but remember that we did so because of | |
1139 | * a timeout -- we'll reenable after we finish this next request | |
1140 | * (or rather the first chunk of it) in pio. | |
1141 | */ | |
c3922048 | 1142 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 1143 | drive->retry_pio++; |
4a546e04 | 1144 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1145 | |
1146 | /* | |
1147 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1148 | * make sure request is sane | |
1149 | */ | |
1150 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1151 | |
1152 | if (!rq) | |
1153 | goto out; | |
1154 | ||
1da177e4 LT |
1155 | HWGROUP(drive)->rq = NULL; |
1156 | ||
1157 | rq->errors = 0; | |
1158 | ||
1159 | if (!rq->bio) | |
1160 | goto out; | |
1161 | ||
1162 | rq->sector = rq->bio->bi_sector; | |
1163 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1164 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1165 | rq->buffer = bio_data(rq->bio); | |
1166 | out: | |
1167 | return ret; | |
1168 | } | |
1169 | ||
1170 | /** | |
1171 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1172 | * @data: timer callback magic (hwgroup) | |
1173 | * | |
1174 | * An IDE command has timed out before the expected drive return | |
1175 | * occurred. At this point we attempt to clean up the current | |
1176 | * mess. If the current handler includes an expiry handler then | |
1177 | * we invoke the expiry handler, and providing it is happy the | |
1178 | * work is done. If that fails we apply generic recovery rules | |
1179 | * invoking the handler and checking the drive DMA status. We | |
1180 | * have an excessively incestuous relationship with the DMA | |
1181 | * logic that wants cleaning up. | |
1182 | */ | |
1183 | ||
1184 | void ide_timer_expiry (unsigned long data) | |
1185 | { | |
1186 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1187 | ide_handler_t *handler; | |
1188 | ide_expiry_t *expiry; | |
1189 | unsigned long flags; | |
1190 | unsigned long wait = -1; | |
1191 | ||
1192 | spin_lock_irqsave(&ide_lock, flags); | |
1193 | ||
23450319 SS |
1194 | if (((handler = hwgroup->handler) == NULL) || |
1195 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1196 | /* |
1197 | * Either a marginal timeout occurred | |
1198 | * (got the interrupt just as timer expired), | |
1199 | * or we were "sleeping" to give other devices a chance. | |
1200 | * Either way, we don't really want to complain about anything. | |
1201 | */ | |
1202 | if (hwgroup->sleeping) { | |
1203 | hwgroup->sleeping = 0; | |
1204 | hwgroup->busy = 0; | |
1205 | } | |
1206 | } else { | |
1207 | ide_drive_t *drive = hwgroup->drive; | |
1208 | if (!drive) { | |
1209 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1210 | hwgroup->handler = NULL; | |
1211 | } else { | |
1212 | ide_hwif_t *hwif; | |
1213 | ide_startstop_t startstop = ide_stopped; | |
1214 | if (!hwgroup->busy) { | |
1215 | hwgroup->busy = 1; /* paranoia */ | |
1216 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1217 | } | |
1218 | if ((expiry = hwgroup->expiry) != NULL) { | |
1219 | /* continue */ | |
1220 | if ((wait = expiry(drive)) > 0) { | |
1221 | /* reset timer */ | |
1222 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1223 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1224 | add_timer(&hwgroup->timer); |
1225 | spin_unlock_irqrestore(&ide_lock, flags); | |
1226 | return; | |
1227 | } | |
1228 | } | |
1229 | hwgroup->handler = NULL; | |
1230 | /* | |
1231 | * We need to simulate a real interrupt when invoking | |
1232 | * the handler() function, which means we need to | |
1233 | * globally mask the specific IRQ: | |
1234 | */ | |
1235 | spin_unlock(&ide_lock); | |
1236 | hwif = HWIF(drive); | |
1da177e4 LT |
1237 | /* disable_irq_nosync ?? */ |
1238 | disable_irq(hwif->irq); | |
1da177e4 LT |
1239 | /* local CPU only, |
1240 | * as if we were handling an interrupt */ | |
1241 | local_irq_disable(); | |
1242 | if (hwgroup->polling) { | |
1243 | startstop = handler(drive); | |
1244 | } else if (drive_is_ready(drive)) { | |
1245 | if (drive->waiting_for_dma) | |
5e37bdc0 | 1246 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1247 | (void)ide_ack_intr(hwif); |
1248 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1249 | startstop = handler(drive); | |
1250 | } else { | |
1251 | if (drive->waiting_for_dma) { | |
1252 | startstop = ide_dma_timeout_retry(drive, wait); | |
1253 | } else | |
1254 | startstop = | |
c47137a9 | 1255 | ide_error(drive, "irq timeout", |
374e042c | 1256 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1257 | } |
1258 | drive->service_time = jiffies - drive->service_start; | |
1259 | spin_lock_irq(&ide_lock); | |
1260 | enable_irq(hwif->irq); | |
1261 | if (startstop == ide_stopped) | |
1262 | hwgroup->busy = 0; | |
1263 | } | |
1264 | } | |
1265 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1266 | spin_unlock_irqrestore(&ide_lock, flags); | |
1267 | } | |
1268 | ||
1269 | /** | |
1270 | * unexpected_intr - handle an unexpected IDE interrupt | |
1271 | * @irq: interrupt line | |
1272 | * @hwgroup: hwgroup being processed | |
1273 | * | |
1274 | * There's nothing really useful we can do with an unexpected interrupt, | |
1275 | * other than reading the status register (to clear it), and logging it. | |
1276 | * There should be no way that an irq can happen before we're ready for it, | |
1277 | * so we needn't worry much about losing an "important" interrupt here. | |
1278 | * | |
1279 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1280 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1281 | * looks "good", we just ignore the interrupt completely. | |
1282 | * | |
1283 | * This routine assumes __cli() is in effect when called. | |
1284 | * | |
1285 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1286 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1287 | * we could screw up by interfering with a new request being set up for | |
1288 | * irq15. | |
1289 | * | |
1290 | * In reality, this is a non-issue. The new command is not sent unless | |
1291 | * the drive is ready to accept one, in which case we know the drive is | |
1292 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1293 | * before completing the issuance of any new drive command, so we will not | |
1294 | * be accidentally invoked as a result of any valid command completion | |
1295 | * interrupt. | |
1296 | * | |
1297 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1298 | * is doing the current command, but we don't know which hwif burped | |
1299 | * mysteriously. | |
1300 | */ | |
1301 | ||
1302 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1303 | { | |
1304 | u8 stat; | |
1305 | ide_hwif_t *hwif = hwgroup->hwif; | |
1306 | ||
1307 | /* | |
1308 | * handle the unexpected interrupt | |
1309 | */ | |
1310 | do { | |
1311 | if (hwif->irq == irq) { | |
374e042c | 1312 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1313 | |
3a7d2484 | 1314 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1315 | /* Try to not flood the console with msgs */ |
1316 | static unsigned long last_msgtime, count; | |
1317 | ++count; | |
1318 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1319 | last_msgtime = jiffies; | |
1320 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1321 | "status=0x%02x, count=%ld\n", | |
1322 | hwif->name, | |
1323 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1324 | } | |
1325 | } | |
1326 | } | |
1327 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1328 | } | |
1329 | ||
1330 | /** | |
1331 | * ide_intr - default IDE interrupt handler | |
1332 | * @irq: interrupt number | |
1333 | * @dev_id: hwif group | |
1334 | * @regs: unused weirdness from the kernel irq layer | |
1335 | * | |
1336 | * This is the default IRQ handler for the IDE layer. You should | |
1337 | * not need to override it. If you do be aware it is subtle in | |
1338 | * places | |
1339 | * | |
1340 | * hwgroup->hwif is the interface in the group currently performing | |
1341 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1342 | * the IRQ handler to call. As we issue a command the handlers | |
1343 | * step through multiple states, reassigning the handler to the | |
1344 | * next step in the process. Unlike a smart SCSI controller IDE | |
1345 | * expects the main processor to sequence the various transfer | |
1346 | * stages. We also manage a poll timer to catch up with most | |
1347 | * timeout situations. There are still a few where the handlers | |
1348 | * don't ever decide to give up. | |
1349 | * | |
1350 | * The handler eventually returns ide_stopped to indicate the | |
1351 | * request completed. At this point we issue the next request | |
1352 | * on the hwgroup and the process begins again. | |
1353 | */ | |
1354 | ||
7d12e780 | 1355 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1356 | { |
1357 | unsigned long flags; | |
1358 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1359 | ide_hwif_t *hwif; | |
1360 | ide_drive_t *drive; | |
1361 | ide_handler_t *handler; | |
1362 | ide_startstop_t startstop; | |
1363 | ||
1364 | spin_lock_irqsave(&ide_lock, flags); | |
1365 | hwif = hwgroup->hwif; | |
1366 | ||
1367 | if (!ide_ack_intr(hwif)) { | |
1368 | spin_unlock_irqrestore(&ide_lock, flags); | |
1369 | return IRQ_NONE; | |
1370 | } | |
1371 | ||
1372 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1373 | /* | |
1374 | * Not expecting an interrupt from this drive. | |
1375 | * That means this could be: | |
1376 | * (1) an interrupt from another PCI device | |
1377 | * sharing the same PCI INT# as us. | |
1378 | * or (2) a drive just entered sleep or standby mode, | |
1379 | * and is interrupting to let us know. | |
1380 | * or (3) a spurious interrupt of unknown origin. | |
1381 | * | |
1382 | * For PCI, we cannot tell the difference, | |
1383 | * so in that case we just ignore it and hope it goes away. | |
1384 | * | |
1385 | * FIXME: unexpected_intr should be hwif-> then we can | |
1386 | * remove all the ifdef PCI crap | |
1387 | */ | |
1388 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1389 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1390 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1391 | { | |
1392 | /* | |
1393 | * Probably not a shared PCI interrupt, | |
1394 | * so we can safely try to do something about it: | |
1395 | */ | |
1396 | unexpected_intr(irq, hwgroup); | |
1397 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1398 | } else { | |
1399 | /* | |
1400 | * Whack the status register, just in case | |
1401 | * we have a leftover pending IRQ. | |
1402 | */ | |
374e042c | 1403 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1404 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1405 | } | |
1406 | spin_unlock_irqrestore(&ide_lock, flags); | |
1407 | return IRQ_NONE; | |
1408 | } | |
1409 | drive = hwgroup->drive; | |
1410 | if (!drive) { | |
1411 | /* | |
1412 | * This should NEVER happen, and there isn't much | |
1413 | * we could do about it here. | |
1414 | * | |
1415 | * [Note - this can occur if the drive is hot unplugged] | |
1416 | */ | |
1417 | spin_unlock_irqrestore(&ide_lock, flags); | |
1418 | return IRQ_HANDLED; | |
1419 | } | |
1420 | if (!drive_is_ready(drive)) { | |
1421 | /* | |
1422 | * This happens regularly when we share a PCI IRQ with | |
1423 | * another device. Unfortunately, it can also happen | |
1424 | * with some buggy drives that trigger the IRQ before | |
1425 | * their status register is up to date. Hopefully we have | |
1426 | * enough advance overhead that the latter isn't a problem. | |
1427 | */ | |
1428 | spin_unlock_irqrestore(&ide_lock, flags); | |
1429 | return IRQ_NONE; | |
1430 | } | |
1431 | if (!hwgroup->busy) { | |
1432 | hwgroup->busy = 1; /* paranoia */ | |
1433 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1434 | } | |
1435 | hwgroup->handler = NULL; | |
23450319 | 1436 | hwgroup->req_gen++; |
1da177e4 LT |
1437 | del_timer(&hwgroup->timer); |
1438 | spin_unlock(&ide_lock); | |
1439 | ||
bfa7d8e5 BZ |
1440 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1441 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1442 | |
97100fc8 | 1443 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1444 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1445 | |
1da177e4 LT |
1446 | /* service this interrupt, may set handler for next interrupt */ |
1447 | startstop = handler(drive); | |
1da177e4 | 1448 | |
bfa7d8e5 | 1449 | spin_lock_irq(&ide_lock); |
1da177e4 LT |
1450 | /* |
1451 | * Note that handler() may have set things up for another | |
1452 | * interrupt to occur soon, but it cannot happen until | |
1453 | * we exit from this routine, because it will be the | |
1454 | * same irq as is currently being serviced here, and Linux | |
1455 | * won't allow another of the same (on any CPU) until we return. | |
1456 | */ | |
1457 | drive->service_time = jiffies - drive->service_start; | |
1458 | if (startstop == ide_stopped) { | |
1459 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1460 | hwgroup->busy = 0; | |
1461 | ide_do_request(hwgroup, hwif->irq); | |
1462 | } else { | |
1463 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1464 | "on exit\n", drive->name); | |
1465 | } | |
1466 | } | |
1467 | spin_unlock_irqrestore(&ide_lock, flags); | |
1468 | return IRQ_HANDLED; | |
1469 | } | |
1470 | ||
1da177e4 LT |
1471 | /** |
1472 | * ide_do_drive_cmd - issue IDE special command | |
1473 | * @drive: device to issue command | |
1474 | * @rq: request to issue | |
1da177e4 LT |
1475 | * |
1476 | * This function issues a special IDE device request | |
1477 | * onto the request queue. | |
1478 | * | |
63f5abb0 FT |
1479 | * the rq is queued at the head of the request queue, displacing |
1480 | * the currently-being-processed request and this function | |
1481 | * returns immediately without waiting for the new rq to be | |
1482 | * completed. This is VERY DANGEROUS, and is intended for | |
1483 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1484 | */ |
63f5abb0 FT |
1485 | |
1486 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 LT |
1487 | { |
1488 | unsigned long flags; | |
1489 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
e8a96aa7 | 1490 | |
1da177e4 | 1491 | spin_lock_irqsave(&ide_lock, flags); |
63f5abb0 | 1492 | hwgroup->rq = NULL; |
f73e2d13 JA |
1493 | __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0); |
1494 | blk_start_queueing(drive->queue); | |
1da177e4 | 1495 | spin_unlock_irqrestore(&ide_lock, flags); |
1da177e4 LT |
1496 | } |
1497 | ||
1498 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1499 | |
1500 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1501 | { | |
6e6afb3b | 1502 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1503 | ide_task_t task; |
1504 | ||
1505 | memset(&task, 0, sizeof(task)); | |
1506 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1507 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1508 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1509 | task.tf.lbam = bcount & 0xff; | |
1510 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1511 | ||
089c5c7e | 1512 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1513 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1514 | SELECT_MASK(drive, 0); |
374e042c | 1515 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1516 | } |
1517 | ||
1518 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1519 | |
1520 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1521 | { | |
1522 | ide_hwif_t *hwif = drive->hwif; | |
1523 | u8 buf[4] = { 0 }; | |
1524 | ||
1525 | while (len > 0) { | |
1526 | if (write) | |
374e042c | 1527 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1528 | else |
374e042c | 1529 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1530 | len -= 4; |
1531 | } | |
1532 | } | |
1533 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |