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 | ||
6b7d8fc3 | 135 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq) |
1da177e4 | 136 | { |
c00895ab | 137 | struct request_pm_state *pm = rq->data; |
ad3cadda | 138 | |
6b7d8fc3 BZ |
139 | #ifdef DEBUG_PM |
140 | printk(KERN_INFO "%s: complete_power_step(step: %d)\n", | |
141 | drive->name, pm->pm_step); | |
142 | #endif | |
1da177e4 LT |
143 | if (drive->media != ide_disk) |
144 | return; | |
145 | ||
ad3cadda | 146 | switch (pm->pm_step) { |
0d346ba0 | 147 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
ad3cadda | 148 | if (pm->pm_state == PM_EVENT_FREEZE) |
0d346ba0 | 149 | pm->pm_step = IDE_PM_COMPLETED; |
1da177e4 | 150 | else |
0d346ba0 | 151 | pm->pm_step = IDE_PM_STANDBY; |
1da177e4 | 152 | break; |
0d346ba0 BZ |
153 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
154 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 155 | break; |
0d346ba0 BZ |
156 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
157 | pm->pm_step = IDE_PM_IDLE; | |
8c2c0118 | 158 | break; |
0d346ba0 BZ |
159 | case IDE_PM_IDLE: /* Resume step 2 (idle)*/ |
160 | pm->pm_step = IDE_PM_RESTORE_DMA; | |
1da177e4 LT |
161 | break; |
162 | } | |
163 | } | |
164 | ||
165 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) | |
166 | { | |
c00895ab | 167 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
168 | ide_task_t *args = rq->special; |
169 | ||
170 | memset(args, 0, sizeof(*args)); | |
171 | ||
ad3cadda | 172 | switch (pm->pm_step) { |
0d346ba0 | 173 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
1da177e4 LT |
174 | if (drive->media != ide_disk) |
175 | break; | |
176 | /* Not supported? Switch to next step now. */ | |
97100fc8 BZ |
177 | if (ata_id_flush_enabled(drive->id) == 0 || |
178 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { | |
6b7d8fc3 | 179 | ide_complete_power_step(drive, rq); |
1da177e4 LT |
180 | return ide_stopped; |
181 | } | |
ff2779b5 | 182 | if (ata_id_flush_ext_enabled(drive->id)) |
aaaade3f | 183 | args->tf.command = ATA_CMD_FLUSH_EXT; |
1da177e4 | 184 | else |
aaaade3f | 185 | args->tf.command = ATA_CMD_FLUSH; |
74095a91 | 186 | goto out_do_tf; |
0d346ba0 | 187 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
aaaade3f | 188 | args->tf.command = ATA_CMD_STANDBYNOW1; |
74095a91 | 189 | goto out_do_tf; |
0d346ba0 | 190 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
26bcb879 | 191 | ide_set_max_pio(drive); |
317a46a2 | 192 | /* |
0d346ba0 | 193 | * skip IDE_PM_IDLE for ATAPI devices |
317a46a2 BZ |
194 | */ |
195 | if (drive->media != ide_disk) | |
0d346ba0 | 196 | pm->pm_step = IDE_PM_RESTORE_DMA; |
317a46a2 | 197 | else |
6b7d8fc3 | 198 | ide_complete_power_step(drive, rq); |
8c2c0118 | 199 | return ide_stopped; |
0d346ba0 | 200 | case IDE_PM_IDLE: /* Resume step 2 (idle) */ |
aaaade3f | 201 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
74095a91 | 202 | goto out_do_tf; |
0d346ba0 | 203 | case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ |
1da177e4 | 204 | /* |
0ae2e178 | 205 | * Right now, all we do is call ide_set_dma(drive), |
1da177e4 LT |
206 | * we could be smarter and check for current xfer_speed |
207 | * in struct drive etc... | |
208 | */ | |
5e37bdc0 | 209 | if (drive->hwif->dma_ops == NULL) |
1da177e4 | 210 | break; |
1a659880 BZ |
211 | /* |
212 | * TODO: respect IDE_DFLAG_USING_DMA | |
213 | */ | |
214 | ide_set_dma(drive); | |
1da177e4 LT |
215 | break; |
216 | } | |
0d346ba0 BZ |
217 | |
218 | pm->pm_step = IDE_PM_COMPLETED; | |
1da177e4 | 219 | return ide_stopped; |
74095a91 BZ |
220 | |
221 | out_do_tf: | |
657cc1a8 | 222 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
ac026ff2 | 223 | args->data_phase = TASKFILE_NO_DATA; |
74095a91 | 224 | return do_rw_taskfile(drive, args); |
1da177e4 LT |
225 | } |
226 | ||
dbe217af AC |
227 | /** |
228 | * ide_end_dequeued_request - complete an IDE I/O | |
229 | * @drive: IDE device for the I/O | |
230 | * @uptodate: | |
231 | * @nr_sectors: number of sectors completed | |
232 | * | |
233 | * Complete an I/O that is no longer on the request queue. This | |
234 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
235 | * We must still finish the old request but we must not tamper with the | |
236 | * queue in the meantime. | |
237 | * | |
238 | * NOTE: This path does not handle barrier, but barrier is not supported | |
239 | * on ide-cd anyway. | |
240 | */ | |
241 | ||
242 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
243 | int uptodate, int nr_sectors) | |
244 | { | |
245 | unsigned long flags; | |
bbc615b1 | 246 | int ret; |
dbe217af AC |
247 | |
248 | spin_lock_irqsave(&ide_lock, flags); | |
4aff5e23 | 249 | BUG_ON(!blk_rq_started(rq)); |
bbc615b1 | 250 | ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af | 251 | spin_unlock_irqrestore(&ide_lock, flags); |
bbc615b1 | 252 | |
dbe217af AC |
253 | return ret; |
254 | } | |
255 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
256 | ||
257 | ||
1da177e4 LT |
258 | /** |
259 | * ide_complete_pm_request - end the current Power Management request | |
260 | * @drive: target drive | |
261 | * @rq: request | |
262 | * | |
263 | * This function cleans up the current PM request and stops the queue | |
264 | * if necessary. | |
265 | */ | |
266 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) | |
267 | { | |
268 | unsigned long flags; | |
269 | ||
270 | #ifdef DEBUG_PM | |
271 | printk("%s: completing PM request, %s\n", drive->name, | |
272 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); | |
273 | #endif | |
274 | spin_lock_irqsave(&ide_lock, flags); | |
275 | if (blk_pm_suspend_request(rq)) { | |
276 | blk_stop_queue(drive->queue); | |
277 | } else { | |
97100fc8 | 278 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
1da177e4 LT |
279 | blk_start_queue(drive->queue); |
280 | } | |
1da177e4 | 281 | HWGROUP(drive)->rq = NULL; |
5e36bb6e KU |
282 | if (__blk_end_request(rq, 0, 0)) |
283 | BUG(); | |
1da177e4 LT |
284 | spin_unlock_irqrestore(&ide_lock, flags); |
285 | } | |
286 | ||
1da177e4 LT |
287 | /** |
288 | * ide_end_drive_cmd - end an explicit drive command | |
289 | * @drive: command | |
290 | * @stat: status bits | |
291 | * @err: error bits | |
292 | * | |
293 | * Clean up after success/failure of an explicit drive command. | |
294 | * These get thrown onto the queue so they are synchronized with | |
295 | * real I/O operations on the drive. | |
296 | * | |
297 | * In LBA48 mode we have to read the register set twice to get | |
298 | * all the extra information out. | |
299 | */ | |
300 | ||
301 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
302 | { | |
1da177e4 LT |
303 | unsigned long flags; |
304 | struct request *rq; | |
305 | ||
306 | spin_lock_irqsave(&ide_lock, flags); | |
307 | rq = HWGROUP(drive)->rq; | |
308 | spin_unlock_irqrestore(&ide_lock, flags); | |
309 | ||
7267c337 | 310 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
311 | ide_task_t *task = (ide_task_t *)rq->special; |
312 | ||
1da177e4 | 313 | if (rq->errors == 0) |
3a7d2484 | 314 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
395d8ef5 BZ |
315 | |
316 | if (task) { | |
317 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 318 | |
650d841d | 319 | tf->error = err; |
650d841d | 320 | tf->status = stat; |
1da177e4 | 321 | |
374e042c | 322 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
323 | |
324 | if (task->tf_flags & IDE_TFLAG_DYN) | |
325 | kfree(task); | |
1da177e4 LT |
326 | } |
327 | } else if (blk_pm_request(rq)) { | |
c00895ab | 328 | struct request_pm_state *pm = rq->data; |
6b7d8fc3 BZ |
329 | |
330 | ide_complete_power_step(drive, rq); | |
0d346ba0 | 331 | if (pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
332 | ide_complete_pm_request(drive, rq); |
333 | return; | |
334 | } | |
335 | ||
336 | spin_lock_irqsave(&ide_lock, flags); | |
1da177e4 LT |
337 | HWGROUP(drive)->rq = NULL; |
338 | rq->errors = err; | |
3b0e044d KU |
339 | if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0), |
340 | blk_rq_bytes(rq)))) | |
5e36bb6e | 341 | BUG(); |
1da177e4 LT |
342 | spin_unlock_irqrestore(&ide_lock, flags); |
343 | } | |
344 | ||
345 | EXPORT_SYMBOL(ide_end_drive_cmd); | |
346 | ||
1da177e4 LT |
347 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
348 | { | |
349 | if (rq->rq_disk) { | |
350 | ide_driver_t *drv; | |
351 | ||
352 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
353 | drv->end_request(drive, 0, 0); | |
354 | } else | |
355 | ide_end_request(drive, 0, 0); | |
356 | } | |
357 | ||
358 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
359 | { | |
360 | ide_hwif_t *hwif = drive->hwif; | |
361 | ||
97100fc8 BZ |
362 | if ((stat & ATA_BUSY) || |
363 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
364 | /* other bits are useless when BUSY */ |
365 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 366 | } else if (stat & ATA_ERR) { |
1da177e4 | 367 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 368 | if (err == ATA_ABORTED) { |
d1d76714 | 369 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
370 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
371 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
372 | return ide_stopped; |
373 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
374 | /* UDMA crc error, just retry the operation */ | |
375 | drive->crc_count++; | |
3a7d2484 | 376 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
377 | /* retries won't help these */ |
378 | rq->errors = ERROR_MAX; | |
3a7d2484 | 379 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
380 | /* help it find track zero */ |
381 | rq->errors |= ERROR_RECAL; | |
382 | } | |
383 | } | |
384 | ||
3a7d2484 | 385 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
386 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
387 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
388 | ||
389 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
390 | } | |
1da177e4 | 391 | |
513daadd SS |
392 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
393 | ide_kill_rq(drive, rq); | |
394 | return ide_stopped; | |
395 | } | |
396 | ||
3a7d2484 | 397 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 398 | rq->errors |= ERROR_RESET; |
1da177e4 | 399 | |
513daadd | 400 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 401 | ++rq->errors; |
513daadd | 402 | return ide_do_reset(drive); |
1da177e4 | 403 | } |
513daadd SS |
404 | |
405 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
406 | drive->special.b.recalibrate = 1; | |
407 | ||
408 | ++rq->errors; | |
409 | ||
1da177e4 LT |
410 | return ide_stopped; |
411 | } | |
412 | ||
413 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
414 | { | |
415 | ide_hwif_t *hwif = drive->hwif; | |
416 | ||
97100fc8 BZ |
417 | if ((stat & ATA_BUSY) || |
418 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
419 | /* other bits are useless when BUSY */ |
420 | rq->errors |= ERROR_RESET; | |
421 | } else { | |
422 | /* add decoding error stuff */ | |
423 | } | |
424 | ||
3a7d2484 | 425 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 426 | /* force an abort */ |
aaaade3f | 427 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
428 | |
429 | if (rq->errors >= ERROR_MAX) { | |
430 | ide_kill_rq(drive, rq); | |
431 | } else { | |
432 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
433 | ++rq->errors; | |
434 | return ide_do_reset(drive); | |
435 | } | |
436 | ++rq->errors; | |
437 | } | |
438 | ||
439 | return ide_stopped; | |
440 | } | |
441 | ||
442 | ide_startstop_t | |
443 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
444 | { | |
445 | if (drive->media == ide_disk) | |
446 | return ide_ata_error(drive, rq, stat, err); | |
447 | return ide_atapi_error(drive, rq, stat, err); | |
448 | } | |
449 | ||
450 | EXPORT_SYMBOL_GPL(__ide_error); | |
451 | ||
452 | /** | |
453 | * ide_error - handle an error on the IDE | |
454 | * @drive: drive the error occurred on | |
455 | * @msg: message to report | |
456 | * @stat: status bits | |
457 | * | |
458 | * ide_error() takes action based on the error returned by the drive. | |
459 | * For normal I/O that may well include retries. We deal with | |
460 | * both new-style (taskfile) and old style command handling here. | |
461 | * In the case of taskfile command handling there is work left to | |
462 | * do | |
463 | */ | |
464 | ||
465 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
466 | { | |
467 | struct request *rq; | |
468 | u8 err; | |
469 | ||
470 | err = ide_dump_status(drive, msg, stat); | |
471 | ||
472 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
473 | return ide_stopped; | |
474 | ||
475 | /* retry only "normal" I/O: */ | |
4aff5e23 | 476 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
477 | rq->errors = 1; |
478 | ide_end_drive_cmd(drive, stat, err); | |
479 | return ide_stopped; | |
480 | } | |
481 | ||
482 | if (rq->rq_disk) { | |
483 | ide_driver_t *drv; | |
484 | ||
485 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
486 | return drv->error(drive, rq, stat, err); | |
487 | } else | |
488 | return __ide_error(drive, rq, stat, err); | |
489 | } | |
490 | ||
491 | EXPORT_SYMBOL_GPL(ide_error); | |
492 | ||
57d7366b | 493 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 494 | { |
57d7366b BZ |
495 | tf->nsect = drive->sect; |
496 | tf->lbal = drive->sect; | |
497 | tf->lbam = drive->cyl; | |
498 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 499 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 500 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
501 | } |
502 | ||
57d7366b | 503 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 504 | { |
57d7366b | 505 | tf->nsect = drive->sect; |
aaaade3f | 506 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
507 | } |
508 | ||
57d7366b | 509 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 510 | { |
57d7366b | 511 | tf->nsect = drive->mult_req; |
aaaade3f | 512 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
513 | } |
514 | ||
515 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
516 | { | |
517 | special_t *s = &drive->special; | |
518 | ide_task_t args; | |
519 | ||
520 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 521 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
522 | |
523 | if (s->b.set_geometry) { | |
524 | s->b.set_geometry = 0; | |
57d7366b | 525 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
526 | } else if (s->b.recalibrate) { |
527 | s->b.recalibrate = 0; | |
57d7366b | 528 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
529 | } else if (s->b.set_multmode) { |
530 | s->b.set_multmode = 0; | |
57d7366b | 531 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
532 | } else if (s->all) { |
533 | int special = s->all; | |
534 | s->all = 0; | |
535 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
536 | return ide_stopped; | |
537 | } | |
538 | ||
657cc1a8 | 539 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 540 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 541 | |
1da177e4 LT |
542 | do_rw_taskfile(drive, &args); |
543 | ||
544 | return ide_started; | |
545 | } | |
546 | ||
547 | /** | |
548 | * do_special - issue some special commands | |
549 | * @drive: drive the command is for | |
550 | * | |
aaaade3f BZ |
551 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
552 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
553 | * | |
554 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
555 | */ |
556 | ||
557 | static ide_startstop_t do_special (ide_drive_t *drive) | |
558 | { | |
559 | special_t *s = &drive->special; | |
560 | ||
561 | #ifdef DEBUG | |
562 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
563 | #endif | |
6982daf7 BZ |
564 | if (drive->media == ide_disk) |
565 | return ide_disk_special(drive); | |
1da177e4 | 566 | |
6982daf7 BZ |
567 | s->all = 0; |
568 | drive->mult_req = 0; | |
569 | return ide_stopped; | |
1da177e4 LT |
570 | } |
571 | ||
572 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
573 | { | |
574 | ide_hwif_t *hwif = drive->hwif; | |
575 | struct scatterlist *sg = hwif->sg_table; | |
576 | ||
577 | if (hwif->sg_mapped) /* needed by ide-scsi */ | |
578 | return; | |
579 | ||
4aff5e23 | 580 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
581 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
582 | } else { | |
583 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
584 | hwif->sg_nents = 1; | |
585 | } | |
586 | } | |
587 | ||
588 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
589 | ||
590 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
591 | { | |
592 | ide_hwif_t *hwif = drive->hwif; | |
593 | ||
594 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
595 | hwif->cursg_ofs = 0; |
596 | hwif->cursg = NULL; | |
1da177e4 LT |
597 | } |
598 | ||
599 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
600 | ||
601 | /** | |
602 | * execute_drive_command - issue special drive command | |
338cec32 | 603 | * @drive: the drive to issue the command on |
1da177e4 LT |
604 | * @rq: the request structure holding the command |
605 | * | |
606 | * execute_drive_cmd() issues a special drive command, usually | |
607 | * initiated by ioctl() from the external hdparm program. The | |
608 | * command can be a drive command, drive task or taskfile | |
609 | * operation. Weirdly you can call it with NULL to wait for | |
610 | * all commands to finish. Don't do this as that is due to change | |
611 | */ | |
612 | ||
613 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
614 | struct request *rq) | |
615 | { | |
616 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 617 | ide_task_t *task = rq->special; |
1da177e4 | 618 | |
7267c337 | 619 | if (task) { |
21d535c9 | 620 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
621 | |
622 | switch (hwif->data_phase) { | |
623 | case TASKFILE_MULTI_OUT: | |
624 | case TASKFILE_OUT: | |
625 | case TASKFILE_MULTI_IN: | |
626 | case TASKFILE_IN: | |
627 | ide_init_sg_cmd(drive, rq); | |
628 | ide_map_sg(drive, rq); | |
629 | default: | |
630 | break; | |
631 | } | |
74095a91 | 632 | |
21d535c9 BZ |
633 | return do_rw_taskfile(drive, task); |
634 | } | |
635 | ||
1da177e4 LT |
636 | /* |
637 | * NULL is actually a valid way of waiting for | |
638 | * all current requests to be flushed from the queue. | |
639 | */ | |
640 | #ifdef DEBUG | |
641 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
642 | #endif | |
374e042c | 643 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 644 | ide_read_error(drive)); |
64a57fe4 | 645 | |
1da177e4 LT |
646 | return ide_stopped; |
647 | } | |
648 | ||
92f1f8fd EO |
649 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
650 | int arg) | |
651 | { | |
652 | struct request_queue *q = drive->queue; | |
653 | struct request *rq; | |
654 | int ret = 0; | |
655 | ||
656 | if (!(setting->flags & DS_SYNC)) | |
657 | return setting->set(drive, arg); | |
658 | ||
e415e495 | 659 | rq = blk_get_request(q, READ, __GFP_WAIT); |
92f1f8fd EO |
660 | rq->cmd_type = REQ_TYPE_SPECIAL; |
661 | rq->cmd_len = 5; | |
662 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
663 | *(int *)&rq->cmd[1] = arg; | |
664 | rq->special = setting->set; | |
665 | ||
666 | if (blk_execute_rq(q, NULL, rq, 0)) | |
667 | ret = rq->errors; | |
668 | blk_put_request(rq); | |
669 | ||
670 | return ret; | |
671 | } | |
672 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
673 | ||
79e36a9f EO |
674 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
675 | { | |
4abdc6ee EO |
676 | u8 cmd = rq->cmd[0]; |
677 | ||
678 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { | |
679 | ide_task_t task; | |
680 | struct ide_taskfile *tf = &task.tf; | |
681 | ||
682 | memset(&task, 0, sizeof(task)); | |
683 | if (cmd == REQ_PARK_HEADS) { | |
684 | drive->sleep = *(unsigned long *)rq->special; | |
685 | drive->dev_flags |= IDE_DFLAG_SLEEPING; | |
686 | tf->command = ATA_CMD_IDLEIMMEDIATE; | |
687 | tf->feature = 0x44; | |
688 | tf->lbal = 0x4c; | |
689 | tf->lbam = 0x4e; | |
690 | tf->lbah = 0x55; | |
691 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; | |
692 | } else /* cmd == REQ_UNPARK_HEADS */ | |
693 | tf->command = ATA_CMD_CHK_POWER; | |
694 | ||
695 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; | |
696 | task.rq = rq; | |
697 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; | |
698 | return do_rw_taskfile(drive, &task); | |
699 | } | |
700 | ||
701 | switch (cmd) { | |
92f1f8fd EO |
702 | case REQ_DEVSET_EXEC: |
703 | { | |
704 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
705 | ||
706 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
707 | if (err) | |
708 | rq->errors = err; | |
709 | else | |
710 | err = 1; | |
711 | ide_end_request(drive, err, 0); | |
712 | return ide_stopped; | |
713 | } | |
79e36a9f EO |
714 | case REQ_DRIVE_RESET: |
715 | return ide_do_reset(drive); | |
716 | default: | |
717 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
718 | ide_end_request(drive, 0, 0); | |
719 | return ide_stopped; | |
720 | } | |
721 | } | |
722 | ||
ad3cadda JA |
723 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
724 | { | |
c00895ab | 725 | struct request_pm_state *pm = rq->data; |
ad3cadda JA |
726 | |
727 | if (blk_pm_suspend_request(rq) && | |
0d346ba0 | 728 | pm->pm_step == IDE_PM_START_SUSPEND) |
ad3cadda | 729 | /* Mark drive blocked when starting the suspend sequence. */ |
97100fc8 | 730 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
ad3cadda | 731 | else if (blk_pm_resume_request(rq) && |
0d346ba0 | 732 | pm->pm_step == IDE_PM_START_RESUME) { |
ad3cadda JA |
733 | /* |
734 | * The first thing we do on wakeup is to wait for BSY bit to | |
735 | * go away (with a looong timeout) as a drive on this hwif may | |
736 | * just be POSTing itself. | |
737 | * We do that before even selecting as the "other" device on | |
738 | * the bus may be broken enough to walk on our toes at this | |
739 | * point. | |
740 | */ | |
6e6afb3b | 741 | ide_hwif_t *hwif = drive->hwif; |
ad3cadda JA |
742 | int rc; |
743 | #ifdef DEBUG_PM | |
744 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); | |
745 | #endif | |
6e6afb3b | 746 | rc = ide_wait_not_busy(hwif, 35000); |
ad3cadda JA |
747 | if (rc) |
748 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); | |
749 | SELECT_DRIVE(drive); | |
374e042c | 750 | hwif->tp_ops->set_irq(hwif, 1); |
6e6afb3b | 751 | rc = ide_wait_not_busy(hwif, 100000); |
ad3cadda JA |
752 | if (rc) |
753 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); | |
754 | } | |
755 | } | |
756 | ||
1da177e4 LT |
757 | /** |
758 | * start_request - start of I/O and command issuing for IDE | |
759 | * | |
760 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 761 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
762 | * |
763 | * FIXME: this function needs a rename | |
764 | */ | |
765 | ||
766 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
767 | { | |
768 | ide_startstop_t startstop; | |
1da177e4 | 769 | |
4aff5e23 | 770 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
771 | |
772 | #ifdef DEBUG | |
773 | printk("%s: start_request: current=0x%08lx\n", | |
774 | HWIF(drive)->name, (unsigned long) rq); | |
775 | #endif | |
776 | ||
777 | /* bail early if we've exceeded max_failures */ | |
778 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 779 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
780 | goto kill_rq; |
781 | } | |
782 | ||
ad3cadda JA |
783 | if (blk_pm_request(rq)) |
784 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
785 | |
786 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
787 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
788 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
789 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
790 | return startstop; | |
791 | } | |
792 | if (!drive->special.all) { | |
793 | ide_driver_t *drv; | |
794 | ||
513daadd SS |
795 | /* |
796 | * We reset the drive so we need to issue a SETFEATURES. | |
797 | * Do it _after_ do_special() restored device parameters. | |
798 | */ | |
799 | if (drive->current_speed == 0xff) | |
800 | ide_config_drive_speed(drive, drive->desired_speed); | |
801 | ||
7267c337 | 802 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
803 | return execute_drive_cmd(drive, rq); |
804 | else if (blk_pm_request(rq)) { | |
c00895ab | 805 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
806 | #ifdef DEBUG_PM |
807 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 808 | drive->name, pm->pm_step); |
1da177e4 LT |
809 | #endif |
810 | startstop = ide_start_power_step(drive, rq); | |
811 | if (startstop == ide_stopped && | |
0d346ba0 | 812 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
813 | ide_complete_pm_request(drive, rq); |
814 | return startstop; | |
79e36a9f EO |
815 | } else if (!rq->rq_disk && blk_special_request(rq)) |
816 | /* | |
817 | * TODO: Once all ULDs have been modified to | |
818 | * check for specific op codes rather than | |
819 | * blindly accepting any special request, the | |
820 | * check for ->rq_disk above may be replaced | |
821 | * by a more suitable mechanism or even | |
822 | * dropped entirely. | |
823 | */ | |
824 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
825 | |
826 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
827 | |
828 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
829 | } |
830 | return do_special(drive); | |
831 | kill_rq: | |
832 | ide_kill_rq(drive, rq); | |
833 | return ide_stopped; | |
834 | } | |
835 | ||
836 | /** | |
837 | * ide_stall_queue - pause an IDE device | |
838 | * @drive: drive to stall | |
839 | * @timeout: time to stall for (jiffies) | |
840 | * | |
841 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
842 | * to the hwgroup by sleeping for timeout jiffies. | |
843 | */ | |
844 | ||
845 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
846 | { | |
847 | if (timeout > WAIT_WORSTCASE) | |
848 | timeout = WAIT_WORSTCASE; | |
849 | drive->sleep = timeout + jiffies; | |
97100fc8 | 850 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 LT |
851 | } |
852 | ||
853 | EXPORT_SYMBOL(ide_stall_queue); | |
854 | ||
855 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) | |
856 | ||
857 | /** | |
858 | * choose_drive - select a drive to service | |
859 | * @hwgroup: hardware group to select on | |
860 | * | |
861 | * choose_drive() selects the next drive which will be serviced. | |
862 | * This is necessary because the IDE layer can't issue commands | |
863 | * to both drives on the same cable, unlike SCSI. | |
864 | */ | |
865 | ||
866 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) | |
867 | { | |
868 | ide_drive_t *drive, *best; | |
869 | ||
870 | repeat: | |
871 | best = NULL; | |
872 | drive = hwgroup->drive; | |
873 | ||
874 | /* | |
875 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
876 | * though that is 3 requests, it must be seen as a single transaction. | |
877 | * we must not preempt this drive until that is complete | |
878 | */ | |
879 | if (blk_queue_flushing(drive->queue)) { | |
880 | /* | |
881 | * small race where queue could get replugged during | |
882 | * the 3-request flush cycle, just yank the plug since | |
883 | * we want it to finish asap | |
884 | */ | |
885 | blk_remove_plug(drive->queue); | |
886 | return drive; | |
887 | } | |
888 | ||
889 | do { | |
97100fc8 BZ |
890 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
891 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); | |
892 | ||
893 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && | |
894 | !elv_queue_empty(drive->queue)) { | |
895 | if (best == NULL || | |
896 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || | |
897 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { | |
1da177e4 LT |
898 | if (!blk_queue_plugged(drive->queue)) |
899 | best = drive; | |
900 | } | |
901 | } | |
902 | } while ((drive = drive->next) != hwgroup->drive); | |
97100fc8 BZ |
903 | |
904 | if (best && (best->dev_flags & IDE_DFLAG_NICE1) && | |
905 | (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 && | |
906 | best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { | |
1da177e4 LT |
907 | long t = (signed long)(WAKEUP(best) - jiffies); |
908 | if (t >= WAIT_MIN_SLEEP) { | |
909 | /* | |
910 | * We *may* have some time to spare, but first let's see if | |
911 | * someone can potentially benefit from our nice mood today.. | |
912 | */ | |
913 | drive = best->next; | |
914 | do { | |
97100fc8 | 915 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
1da177e4 LT |
916 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
917 | && time_before(WAKEUP(drive), jiffies + t)) | |
918 | { | |
919 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); | |
920 | goto repeat; | |
921 | } | |
922 | } while ((drive = drive->next) != best); | |
923 | } | |
924 | } | |
925 | return best; | |
926 | } | |
927 | ||
928 | /* | |
929 | * Issue a new request to a drive from hwgroup | |
930 | * Caller must have already done spin_lock_irqsave(&ide_lock, ..); | |
931 | * | |
932 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
933 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
934 | * may have both interfaces in a single hwgroup to "serialize" access. | |
935 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
936 | * together into one hwgroup for serialized access. | |
937 | * | |
938 | * Note also that several hwgroups can end up sharing a single IRQ, | |
939 | * possibly along with many other devices. This is especially common in | |
940 | * PCI-based systems with off-board IDE controller cards. | |
941 | * | |
942 | * The IDE driver uses the single global ide_lock spinlock to protect | |
943 | * access to the request queues, and to protect the hwgroup->busy flag. | |
944 | * | |
945 | * The first thread into the driver for a particular hwgroup sets the | |
946 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
947 | * and then initiates processing of the top request from the request queue. | |
948 | * | |
949 | * Other threads attempting entry notice the busy setting, and will simply | |
950 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
951 | * remains set even when the driver is merely awaiting the next interrupt. | |
952 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
953 | * | |
954 | * When processing of a request completes, the completing thread or IRQ-handler | |
955 | * will start the next request from the queue. If no more work remains, | |
956 | * the driver will clear the hwgroup->busy flag and exit. | |
957 | * | |
958 | * The ide_lock (spinlock) is used to protect all access to the | |
959 | * hwgroup->busy flag, but is otherwise not needed for most processing in | |
960 | * the driver. This makes the driver much more friendlier to shared IRQs | |
961 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
962 | */ | |
963 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) | |
964 | { | |
965 | ide_drive_t *drive; | |
966 | ide_hwif_t *hwif; | |
967 | struct request *rq; | |
968 | ide_startstop_t startstop; | |
867f8b4e | 969 | int loops = 0; |
1da177e4 | 970 | |
1da177e4 LT |
971 | /* caller must own ide_lock */ |
972 | BUG_ON(!irqs_disabled()); | |
973 | ||
974 | while (!hwgroup->busy) { | |
975 | hwgroup->busy = 1; | |
f9e3326d MS |
976 | /* for atari only */ |
977 | ide_get_lock(ide_intr, hwgroup); | |
1da177e4 LT |
978 | drive = choose_drive(hwgroup); |
979 | if (drive == NULL) { | |
980 | int sleeping = 0; | |
981 | unsigned long sleep = 0; /* shut up, gcc */ | |
982 | hwgroup->rq = NULL; | |
983 | drive = hwgroup->drive; | |
984 | do { | |
97100fc8 BZ |
985 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
986 | (sleeping == 0 || | |
987 | time_before(drive->sleep, sleep))) { | |
1da177e4 LT |
988 | sleeping = 1; |
989 | sleep = drive->sleep; | |
990 | } | |
991 | } while ((drive = drive->next) != hwgroup->drive); | |
992 | if (sleeping) { | |
993 | /* | |
994 | * Take a short snooze, and then wake up this hwgroup again. | |
995 | * This gives other hwgroups on the same a chance to | |
996 | * play fairly with us, just in case there are big differences | |
997 | * in relative throughputs.. don't want to hog the cpu too much. | |
998 | */ | |
999 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) | |
1000 | sleep = jiffies + WAIT_MIN_SLEEP; | |
1001 | #if 1 | |
1002 | if (timer_pending(&hwgroup->timer)) | |
1003 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); | |
1004 | #endif | |
1005 | /* so that ide_timer_expiry knows what to do */ | |
1006 | hwgroup->sleeping = 1; | |
23450319 | 1007 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1008 | mod_timer(&hwgroup->timer, sleep); |
1009 | /* we purposely leave hwgroup->busy==1 | |
1010 | * while sleeping */ | |
1011 | } else { | |
1012 | /* Ugly, but how can we sleep for the lock | |
1013 | * otherwise? perhaps from tq_disk? | |
1014 | */ | |
1015 | ||
1016 | /* for atari only */ | |
1017 | ide_release_lock(); | |
1018 | hwgroup->busy = 0; | |
1019 | } | |
1020 | ||
1021 | /* no more work for this hwgroup (for now) */ | |
1022 | return; | |
1023 | } | |
867f8b4e | 1024 | again: |
1da177e4 | 1025 | hwif = HWIF(drive); |
81ca6919 | 1026 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
7299a391 BZ |
1027 | /* |
1028 | * set nIEN for previous hwif, drives in the | |
1029 | * quirk_list may not like intr setups/cleanups | |
1030 | */ | |
1031 | if (drive->quirk_list != 1) | |
374e042c | 1032 | hwif->tp_ops->set_irq(hwif, 0); |
1da177e4 LT |
1033 | } |
1034 | hwgroup->hwif = hwif; | |
1035 | hwgroup->drive = drive; | |
4abdc6ee | 1036 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 LT |
1037 | drive->service_start = jiffies; |
1038 | ||
1039 | if (blk_queue_plugged(drive->queue)) { | |
1040 | printk(KERN_ERR "ide: huh? queue was plugged!\n"); | |
1041 | break; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * we know that the queue isn't empty, but this can happen | |
1046 | * if the q->prep_rq_fn() decides to kill a request | |
1047 | */ | |
1048 | rq = elv_next_request(drive->queue); | |
1049 | if (!rq) { | |
1050 | hwgroup->busy = 0; | |
1051 | break; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Sanity: don't accept a request that isn't a PM request | |
1056 | * if we are currently power managed. This is very important as | |
1057 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
1058 | * above to return us whatever is in the queue. Since we call | |
1059 | * ide_do_request() ourselves, we end up taking requests while | |
1060 | * the queue is blocked... | |
1061 | * | |
1062 | * We let requests forced at head of queue with ide-preempt | |
1063 | * though. I hope that doesn't happen too much, hopefully not | |
1064 | * unless the subdriver triggers such a thing in its own PM | |
1065 | * state machine. | |
867f8b4e BH |
1066 | * |
1067 | * We count how many times we loop here to make sure we service | |
1068 | * all drives in the hwgroup without looping for ever | |
1da177e4 | 1069 | */ |
97100fc8 BZ |
1070 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
1071 | blk_pm_request(rq) == 0 && | |
1072 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
867f8b4e BH |
1073 | drive = drive->next ? drive->next : hwgroup->drive; |
1074 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) | |
1075 | goto again; | |
1da177e4 LT |
1076 | /* We clear busy, there should be no pending ATA command at this point. */ |
1077 | hwgroup->busy = 0; | |
1078 | break; | |
1079 | } | |
1080 | ||
1081 | hwgroup->rq = rq; | |
1082 | ||
1083 | /* | |
1084 | * Some systems have trouble with IDE IRQs arriving while | |
1085 | * the driver is still setting things up. So, here we disable | |
1086 | * the IRQ used by this interface while the request is being started. | |
1087 | * This may look bad at first, but pretty much the same thing | |
1088 | * happens anyway when any interrupt comes in, IDE or otherwise | |
1089 | * -- the kernel masks the IRQ while it is being handled. | |
1090 | */ | |
1091 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1092 | disable_irq_nosync(hwif->irq); | |
1093 | spin_unlock(&ide_lock); | |
366c7f55 | 1094 | local_irq_enable_in_hardirq(); |
1da177e4 LT |
1095 | /* allow other IRQs while we start this request */ |
1096 | startstop = start_request(drive, rq); | |
1097 | spin_lock_irq(&ide_lock); | |
1098 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) | |
1099 | enable_irq(hwif->irq); | |
1100 | if (startstop == ide_stopped) | |
1101 | hwgroup->busy = 0; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Passes the stuff to ide_do_request | |
1107 | */ | |
165125e1 | 1108 | void do_ide_request(struct request_queue *q) |
1da177e4 LT |
1109 | { |
1110 | ide_drive_t *drive = q->queuedata; | |
1111 | ||
1112 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
1117 | * retry the current request in pio mode instead of risking tossing it | |
1118 | * all away | |
1119 | */ | |
1120 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
1121 | { | |
1122 | ide_hwif_t *hwif = HWIF(drive); | |
1123 | struct request *rq; | |
1124 | ide_startstop_t ret = ide_stopped; | |
1125 | ||
1126 | /* | |
1127 | * end current dma transaction | |
1128 | */ | |
1129 | ||
1130 | if (error < 0) { | |
1131 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 1132 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 1133 | ret = ide_error(drive, "dma timeout error", |
374e042c | 1134 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1135 | } else { |
1136 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 1137 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
1138 | } |
1139 | ||
1140 | /* | |
1141 | * disable dma for now, but remember that we did so because of | |
1142 | * a timeout -- we'll reenable after we finish this next request | |
1143 | * (or rather the first chunk of it) in pio. | |
1144 | */ | |
c3922048 | 1145 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 1146 | drive->retry_pio++; |
4a546e04 | 1147 | ide_dma_off_quietly(drive); |
1da177e4 LT |
1148 | |
1149 | /* | |
1150 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
1151 | * make sure request is sane | |
1152 | */ | |
1153 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
1154 | |
1155 | if (!rq) | |
1156 | goto out; | |
1157 | ||
1da177e4 LT |
1158 | HWGROUP(drive)->rq = NULL; |
1159 | ||
1160 | rq->errors = 0; | |
1161 | ||
1162 | if (!rq->bio) | |
1163 | goto out; | |
1164 | ||
1165 | rq->sector = rq->bio->bi_sector; | |
1166 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
1167 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
1168 | rq->buffer = bio_data(rq->bio); | |
1169 | out: | |
1170 | return ret; | |
1171 | } | |
1172 | ||
1173 | /** | |
1174 | * ide_timer_expiry - handle lack of an IDE interrupt | |
1175 | * @data: timer callback magic (hwgroup) | |
1176 | * | |
1177 | * An IDE command has timed out before the expected drive return | |
1178 | * occurred. At this point we attempt to clean up the current | |
1179 | * mess. If the current handler includes an expiry handler then | |
1180 | * we invoke the expiry handler, and providing it is happy the | |
1181 | * work is done. If that fails we apply generic recovery rules | |
1182 | * invoking the handler and checking the drive DMA status. We | |
1183 | * have an excessively incestuous relationship with the DMA | |
1184 | * logic that wants cleaning up. | |
1185 | */ | |
1186 | ||
1187 | void ide_timer_expiry (unsigned long data) | |
1188 | { | |
1189 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
1190 | ide_handler_t *handler; | |
1191 | ide_expiry_t *expiry; | |
1192 | unsigned long flags; | |
1193 | unsigned long wait = -1; | |
1194 | ||
1195 | spin_lock_irqsave(&ide_lock, flags); | |
1196 | ||
23450319 SS |
1197 | if (((handler = hwgroup->handler) == NULL) || |
1198 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
1199 | /* |
1200 | * Either a marginal timeout occurred | |
1201 | * (got the interrupt just as timer expired), | |
1202 | * or we were "sleeping" to give other devices a chance. | |
1203 | * Either way, we don't really want to complain about anything. | |
1204 | */ | |
1205 | if (hwgroup->sleeping) { | |
1206 | hwgroup->sleeping = 0; | |
1207 | hwgroup->busy = 0; | |
1208 | } | |
1209 | } else { | |
1210 | ide_drive_t *drive = hwgroup->drive; | |
1211 | if (!drive) { | |
1212 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
1213 | hwgroup->handler = NULL; | |
1214 | } else { | |
1215 | ide_hwif_t *hwif; | |
1216 | ide_startstop_t startstop = ide_stopped; | |
1217 | if (!hwgroup->busy) { | |
1218 | hwgroup->busy = 1; /* paranoia */ | |
1219 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); | |
1220 | } | |
1221 | if ((expiry = hwgroup->expiry) != NULL) { | |
1222 | /* continue */ | |
1223 | if ((wait = expiry(drive)) > 0) { | |
1224 | /* reset timer */ | |
1225 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 1226 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 LT |
1227 | add_timer(&hwgroup->timer); |
1228 | spin_unlock_irqrestore(&ide_lock, flags); | |
1229 | return; | |
1230 | } | |
1231 | } | |
1232 | hwgroup->handler = NULL; | |
1233 | /* | |
1234 | * We need to simulate a real interrupt when invoking | |
1235 | * the handler() function, which means we need to | |
1236 | * globally mask the specific IRQ: | |
1237 | */ | |
1238 | spin_unlock(&ide_lock); | |
1239 | hwif = HWIF(drive); | |
1da177e4 LT |
1240 | /* disable_irq_nosync ?? */ |
1241 | disable_irq(hwif->irq); | |
1da177e4 LT |
1242 | /* local CPU only, |
1243 | * as if we were handling an interrupt */ | |
1244 | local_irq_disable(); | |
1245 | if (hwgroup->polling) { | |
1246 | startstop = handler(drive); | |
1247 | } else if (drive_is_ready(drive)) { | |
1248 | if (drive->waiting_for_dma) | |
5e37bdc0 | 1249 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
1250 | (void)ide_ack_intr(hwif); |
1251 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
1252 | startstop = handler(drive); | |
1253 | } else { | |
1254 | if (drive->waiting_for_dma) { | |
1255 | startstop = ide_dma_timeout_retry(drive, wait); | |
1256 | } else | |
1257 | startstop = | |
c47137a9 | 1258 | ide_error(drive, "irq timeout", |
374e042c | 1259 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
1260 | } |
1261 | drive->service_time = jiffies - drive->service_start; | |
1262 | spin_lock_irq(&ide_lock); | |
1263 | enable_irq(hwif->irq); | |
1264 | if (startstop == ide_stopped) | |
1265 | hwgroup->busy = 0; | |
1266 | } | |
1267 | } | |
1268 | ide_do_request(hwgroup, IDE_NO_IRQ); | |
1269 | spin_unlock_irqrestore(&ide_lock, flags); | |
1270 | } | |
1271 | ||
1272 | /** | |
1273 | * unexpected_intr - handle an unexpected IDE interrupt | |
1274 | * @irq: interrupt line | |
1275 | * @hwgroup: hwgroup being processed | |
1276 | * | |
1277 | * There's nothing really useful we can do with an unexpected interrupt, | |
1278 | * other than reading the status register (to clear it), and logging it. | |
1279 | * There should be no way that an irq can happen before we're ready for it, | |
1280 | * so we needn't worry much about losing an "important" interrupt here. | |
1281 | * | |
1282 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1283 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1284 | * looks "good", we just ignore the interrupt completely. | |
1285 | * | |
1286 | * This routine assumes __cli() is in effect when called. | |
1287 | * | |
1288 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1289 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1290 | * we could screw up by interfering with a new request being set up for | |
1291 | * irq15. | |
1292 | * | |
1293 | * In reality, this is a non-issue. The new command is not sent unless | |
1294 | * the drive is ready to accept one, in which case we know the drive is | |
1295 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1296 | * before completing the issuance of any new drive command, so we will not | |
1297 | * be accidentally invoked as a result of any valid command completion | |
1298 | * interrupt. | |
1299 | * | |
1300 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1301 | * is doing the current command, but we don't know which hwif burped | |
1302 | * mysteriously. | |
1303 | */ | |
1304 | ||
1305 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) | |
1306 | { | |
1307 | u8 stat; | |
1308 | ide_hwif_t *hwif = hwgroup->hwif; | |
1309 | ||
1310 | /* | |
1311 | * handle the unexpected interrupt | |
1312 | */ | |
1313 | do { | |
1314 | if (hwif->irq == irq) { | |
374e042c | 1315 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1316 | |
3a7d2484 | 1317 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1318 | /* Try to not flood the console with msgs */ |
1319 | static unsigned long last_msgtime, count; | |
1320 | ++count; | |
1321 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1322 | last_msgtime = jiffies; | |
1323 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1324 | "status=0x%02x, count=%ld\n", | |
1325 | hwif->name, | |
1326 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1327 | } | |
1328 | } | |
1329 | } | |
1330 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1331 | } | |
1332 | ||
1333 | /** | |
1334 | * ide_intr - default IDE interrupt handler | |
1335 | * @irq: interrupt number | |
1336 | * @dev_id: hwif group | |
1337 | * @regs: unused weirdness from the kernel irq layer | |
1338 | * | |
1339 | * This is the default IRQ handler for the IDE layer. You should | |
1340 | * not need to override it. If you do be aware it is subtle in | |
1341 | * places | |
1342 | * | |
1343 | * hwgroup->hwif is the interface in the group currently performing | |
1344 | * a command. hwgroup->drive is the drive and hwgroup->handler is | |
1345 | * the IRQ handler to call. As we issue a command the handlers | |
1346 | * step through multiple states, reassigning the handler to the | |
1347 | * next step in the process. Unlike a smart SCSI controller IDE | |
1348 | * expects the main processor to sequence the various transfer | |
1349 | * stages. We also manage a poll timer to catch up with most | |
1350 | * timeout situations. There are still a few where the handlers | |
1351 | * don't ever decide to give up. | |
1352 | * | |
1353 | * The handler eventually returns ide_stopped to indicate the | |
1354 | * request completed. At this point we issue the next request | |
1355 | * on the hwgroup and the process begins again. | |
1356 | */ | |
1357 | ||
7d12e780 | 1358 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1359 | { |
1360 | unsigned long flags; | |
1361 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
1362 | ide_hwif_t *hwif; | |
1363 | ide_drive_t *drive; | |
1364 | ide_handler_t *handler; | |
1365 | ide_startstop_t startstop; | |
3e0e29f7 | 1366 | irqreturn_t irq_ret = IRQ_NONE; |
1da177e4 LT |
1367 | |
1368 | spin_lock_irqsave(&ide_lock, flags); | |
1369 | hwif = hwgroup->hwif; | |
1370 | ||
3e0e29f7 BZ |
1371 | if (!ide_ack_intr(hwif)) |
1372 | goto out; | |
1da177e4 LT |
1373 | |
1374 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1375 | /* | |
1376 | * Not expecting an interrupt from this drive. | |
1377 | * That means this could be: | |
1378 | * (1) an interrupt from another PCI device | |
1379 | * sharing the same PCI INT# as us. | |
1380 | * or (2) a drive just entered sleep or standby mode, | |
1381 | * and is interrupting to let us know. | |
1382 | * or (3) a spurious interrupt of unknown origin. | |
1383 | * | |
1384 | * For PCI, we cannot tell the difference, | |
1385 | * so in that case we just ignore it and hope it goes away. | |
1386 | * | |
1387 | * FIXME: unexpected_intr should be hwif-> then we can | |
1388 | * remove all the ifdef PCI crap | |
1389 | */ | |
1390 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1391 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1392 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1393 | { | |
1394 | /* | |
1395 | * Probably not a shared PCI interrupt, | |
1396 | * so we can safely try to do something about it: | |
1397 | */ | |
1398 | unexpected_intr(irq, hwgroup); | |
1399 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
1400 | } else { | |
1401 | /* | |
1402 | * Whack the status register, just in case | |
1403 | * we have a leftover pending IRQ. | |
1404 | */ | |
374e042c | 1405 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1406 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1407 | } | |
3e0e29f7 | 1408 | goto out; |
1da177e4 | 1409 | } |
3e0e29f7 | 1410 | |
1da177e4 LT |
1411 | drive = hwgroup->drive; |
1412 | if (!drive) { | |
1413 | /* | |
1414 | * This should NEVER happen, and there isn't much | |
1415 | * we could do about it here. | |
1416 | * | |
1417 | * [Note - this can occur if the drive is hot unplugged] | |
1418 | */ | |
3e0e29f7 | 1419 | goto out_handled; |
1da177e4 | 1420 | } |
3e0e29f7 BZ |
1421 | |
1422 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
1423 | /* |
1424 | * This happens regularly when we share a PCI IRQ with | |
1425 | * another device. Unfortunately, it can also happen | |
1426 | * with some buggy drives that trigger the IRQ before | |
1427 | * their status register is up to date. Hopefully we have | |
1428 | * enough advance overhead that the latter isn't a problem. | |
1429 | */ | |
3e0e29f7 BZ |
1430 | goto out; |
1431 | ||
1da177e4 LT |
1432 | if (!hwgroup->busy) { |
1433 | hwgroup->busy = 1; /* paranoia */ | |
1434 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); | |
1435 | } | |
1436 | hwgroup->handler = NULL; | |
23450319 | 1437 | hwgroup->req_gen++; |
1da177e4 LT |
1438 | del_timer(&hwgroup->timer); |
1439 | spin_unlock(&ide_lock); | |
1440 | ||
bfa7d8e5 BZ |
1441 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1442 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1443 | |
97100fc8 | 1444 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1445 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1446 | |
1da177e4 LT |
1447 | /* service this interrupt, may set handler for next interrupt */ |
1448 | startstop = handler(drive); | |
1da177e4 | 1449 | |
bfa7d8e5 | 1450 | spin_lock_irq(&ide_lock); |
1da177e4 LT |
1451 | /* |
1452 | * Note that handler() may have set things up for another | |
1453 | * interrupt to occur soon, but it cannot happen until | |
1454 | * we exit from this routine, because it will be the | |
1455 | * same irq as is currently being serviced here, and Linux | |
1456 | * won't allow another of the same (on any CPU) until we return. | |
1457 | */ | |
1458 | drive->service_time = jiffies - drive->service_start; | |
1459 | if (startstop == ide_stopped) { | |
1460 | if (hwgroup->handler == NULL) { /* paranoia */ | |
1461 | hwgroup->busy = 0; | |
1462 | ide_do_request(hwgroup, hwif->irq); | |
1463 | } else { | |
1464 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " | |
1465 | "on exit\n", drive->name); | |
1466 | } | |
1467 | } | |
3e0e29f7 BZ |
1468 | out_handled: |
1469 | irq_ret = IRQ_HANDLED; | |
1470 | out: | |
1da177e4 | 1471 | spin_unlock_irqrestore(&ide_lock, flags); |
3e0e29f7 | 1472 | return irq_ret; |
1da177e4 LT |
1473 | } |
1474 | ||
1da177e4 LT |
1475 | /** |
1476 | * ide_do_drive_cmd - issue IDE special command | |
1477 | * @drive: device to issue command | |
1478 | * @rq: request to issue | |
1da177e4 LT |
1479 | * |
1480 | * This function issues a special IDE device request | |
1481 | * onto the request queue. | |
1482 | * | |
63f5abb0 FT |
1483 | * the rq is queued at the head of the request queue, displacing |
1484 | * the currently-being-processed request and this function | |
1485 | * returns immediately without waiting for the new rq to be | |
1486 | * completed. This is VERY DANGEROUS, and is intended for | |
1487 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1488 | */ |
63f5abb0 FT |
1489 | |
1490 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 LT |
1491 | { |
1492 | unsigned long flags; | |
1493 | ide_hwgroup_t *hwgroup = HWGROUP(drive); | |
e8a96aa7 | 1494 | |
1da177e4 | 1495 | spin_lock_irqsave(&ide_lock, flags); |
63f5abb0 | 1496 | hwgroup->rq = NULL; |
f73e2d13 JA |
1497 | __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0); |
1498 | blk_start_queueing(drive->queue); | |
1da177e4 | 1499 | spin_unlock_irqrestore(&ide_lock, flags); |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | EXPORT_SYMBOL(ide_do_drive_cmd); | |
2fc57388 BZ |
1503 | |
1504 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1505 | { | |
6e6afb3b | 1506 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1507 | ide_task_t task; |
1508 | ||
1509 | memset(&task, 0, sizeof(task)); | |
1510 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1511 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1512 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1513 | task.tf.lbam = bcount & 0xff; | |
1514 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1515 | ||
089c5c7e | 1516 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1517 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1518 | SELECT_MASK(drive, 0); |
374e042c | 1519 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1520 | } |
1521 | ||
1522 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1523 | |
1524 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1525 | { | |
1526 | ide_hwif_t *hwif = drive->hwif; | |
1527 | u8 buf[4] = { 0 }; | |
1528 | ||
1529 | while (len > 0) { | |
1530 | if (write) | |
374e042c | 1531 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1532 | else |
374e042c | 1533 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1534 | len -= 4; |
1535 | } | |
1536 | } | |
1537 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |