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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 | ||
3c8a2cce | 87 | if (!blk_end_request(rq, error, nr_bytes)) |
1da177e4 | 88 | ret = 0; |
a72b2147 BZ |
89 | |
90 | if (ret == 0 && dequeue) | |
91 | drive->hwif->hwgroup->rq = NULL; | |
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; |
1d0bf587 | 110 | struct request *rq = drive->hwif->hwgroup->rq; |
1da177e4 | 111 | |
41e9d344 JA |
112 | if (!nr_bytes) { |
113 | if (blk_pc_request(rq)) | |
114 | nr_bytes = rq->data_len; | |
115 | else | |
116 | nr_bytes = rq->hard_cur_sectors << 9; | |
117 | } | |
1da177e4 | 118 | |
a72b2147 | 119 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
120 | } |
121 | EXPORT_SYMBOL(ide_end_request); | |
122 | ||
dbe217af AC |
123 | /** |
124 | * ide_end_dequeued_request - complete an IDE I/O | |
125 | * @drive: IDE device for the I/O | |
126 | * @uptodate: | |
127 | * @nr_sectors: number of sectors completed | |
128 | * | |
129 | * Complete an I/O that is no longer on the request queue. This | |
130 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
131 | * We must still finish the old request but we must not tamper with the | |
132 | * queue in the meantime. | |
133 | * | |
134 | * NOTE: This path does not handle barrier, but barrier is not supported | |
135 | * on ide-cd anyway. | |
136 | */ | |
137 | ||
138 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
139 | int uptodate, int nr_sectors) | |
140 | { | |
4aff5e23 | 141 | BUG_ON(!blk_rq_started(rq)); |
1d0bf587 | 142 | |
a72b2147 | 143 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af AC |
144 | } |
145 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
146 | ||
1da177e4 LT |
147 | /** |
148 | * ide_end_drive_cmd - end an explicit drive command | |
149 | * @drive: command | |
150 | * @stat: status bits | |
151 | * @err: error bits | |
152 | * | |
153 | * Clean up after success/failure of an explicit drive command. | |
154 | * These get thrown onto the queue so they are synchronized with | |
155 | * real I/O operations on the drive. | |
156 | * | |
157 | * In LBA48 mode we have to read the register set twice to get | |
158 | * all the extra information out. | |
159 | */ | |
160 | ||
161 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
162 | { | |
1d0bf587 BZ |
163 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
164 | struct request *rq = hwgroup->rq; | |
1da177e4 | 165 | |
7267c337 | 166 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
167 | ide_task_t *task = (ide_task_t *)rq->special; |
168 | ||
395d8ef5 BZ |
169 | if (task) { |
170 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 171 | |
650d841d | 172 | tf->error = err; |
650d841d | 173 | tf->status = stat; |
1da177e4 | 174 | |
374e042c | 175 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
176 | |
177 | if (task->tf_flags & IDE_TFLAG_DYN) | |
178 | kfree(task); | |
1da177e4 LT |
179 | } |
180 | } else if (blk_pm_request(rq)) { | |
c00895ab | 181 | struct request_pm_state *pm = rq->data; |
6b7d8fc3 BZ |
182 | |
183 | ide_complete_power_step(drive, rq); | |
0d346ba0 | 184 | if (pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
185 | ide_complete_pm_request(drive, rq); |
186 | return; | |
187 | } | |
188 | ||
1d0bf587 BZ |
189 | hwgroup->rq = NULL; |
190 | ||
1da177e4 | 191 | rq->errors = err; |
1d0bf587 | 192 | |
3c8a2cce BZ |
193 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
194 | blk_rq_bytes(rq)))) | |
5e36bb6e | 195 | BUG(); |
1da177e4 | 196 | } |
1da177e4 LT |
197 | EXPORT_SYMBOL(ide_end_drive_cmd); |
198 | ||
1da177e4 LT |
199 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
200 | { | |
201 | if (rq->rq_disk) { | |
202 | ide_driver_t *drv; | |
203 | ||
204 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
205 | drv->end_request(drive, 0, 0); | |
206 | } else | |
207 | ide_end_request(drive, 0, 0); | |
208 | } | |
209 | ||
210 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
211 | { | |
212 | ide_hwif_t *hwif = drive->hwif; | |
213 | ||
97100fc8 BZ |
214 | if ((stat & ATA_BUSY) || |
215 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
216 | /* other bits are useless when BUSY */ |
217 | rq->errors |= ERROR_RESET; | |
3a7d2484 | 218 | } else if (stat & ATA_ERR) { |
1da177e4 | 219 | /* err has different meaning on cdrom and tape */ |
3a7d2484 | 220 | if (err == ATA_ABORTED) { |
d1d76714 | 221 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
aaaade3f BZ |
222 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
223 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) | |
1da177e4 LT |
224 | return ide_stopped; |
225 | } else if ((err & BAD_CRC) == BAD_CRC) { | |
226 | /* UDMA crc error, just retry the operation */ | |
227 | drive->crc_count++; | |
3a7d2484 | 228 | } else if (err & (ATA_BBK | ATA_UNC)) { |
1da177e4 LT |
229 | /* retries won't help these */ |
230 | rq->errors = ERROR_MAX; | |
3a7d2484 | 231 | } else if (err & ATA_TRK0NF) { |
1da177e4 LT |
232 | /* help it find track zero */ |
233 | rq->errors |= ERROR_RECAL; | |
234 | } | |
235 | } | |
236 | ||
3a7d2484 | 237 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
57279a7a BZ |
238 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
239 | int nsect = drive->mult_count ? drive->mult_count : 1; | |
240 | ||
241 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); | |
242 | } | |
1da177e4 | 243 | |
513daadd SS |
244 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
245 | ide_kill_rq(drive, rq); | |
246 | return ide_stopped; | |
247 | } | |
248 | ||
3a7d2484 | 249 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
513daadd | 250 | rq->errors |= ERROR_RESET; |
1da177e4 | 251 | |
513daadd | 252 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
1da177e4 | 253 | ++rq->errors; |
513daadd | 254 | return ide_do_reset(drive); |
1da177e4 | 255 | } |
513daadd SS |
256 | |
257 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) | |
258 | drive->special.b.recalibrate = 1; | |
259 | ||
260 | ++rq->errors; | |
261 | ||
1da177e4 LT |
262 | return ide_stopped; |
263 | } | |
264 | ||
265 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
266 | { | |
267 | ide_hwif_t *hwif = drive->hwif; | |
268 | ||
97100fc8 BZ |
269 | if ((stat & ATA_BUSY) || |
270 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { | |
1da177e4 LT |
271 | /* other bits are useless when BUSY */ |
272 | rq->errors |= ERROR_RESET; | |
273 | } else { | |
274 | /* add decoding error stuff */ | |
275 | } | |
276 | ||
3a7d2484 | 277 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
1da177e4 | 278 | /* force an abort */ |
aaaade3f | 279 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
1da177e4 LT |
280 | |
281 | if (rq->errors >= ERROR_MAX) { | |
282 | ide_kill_rq(drive, rq); | |
283 | } else { | |
284 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { | |
285 | ++rq->errors; | |
286 | return ide_do_reset(drive); | |
287 | } | |
288 | ++rq->errors; | |
289 | } | |
290 | ||
291 | return ide_stopped; | |
292 | } | |
293 | ||
294 | ide_startstop_t | |
295 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) | |
296 | { | |
297 | if (drive->media == ide_disk) | |
298 | return ide_ata_error(drive, rq, stat, err); | |
299 | return ide_atapi_error(drive, rq, stat, err); | |
300 | } | |
301 | ||
302 | EXPORT_SYMBOL_GPL(__ide_error); | |
303 | ||
304 | /** | |
305 | * ide_error - handle an error on the IDE | |
306 | * @drive: drive the error occurred on | |
307 | * @msg: message to report | |
308 | * @stat: status bits | |
309 | * | |
310 | * ide_error() takes action based on the error returned by the drive. | |
311 | * For normal I/O that may well include retries. We deal with | |
312 | * both new-style (taskfile) and old style command handling here. | |
313 | * In the case of taskfile command handling there is work left to | |
314 | * do | |
315 | */ | |
316 | ||
317 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
318 | { | |
319 | struct request *rq; | |
320 | u8 err; | |
321 | ||
322 | err = ide_dump_status(drive, msg, stat); | |
323 | ||
324 | if ((rq = HWGROUP(drive)->rq) == NULL) | |
325 | return ide_stopped; | |
326 | ||
327 | /* retry only "normal" I/O: */ | |
4aff5e23 | 328 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
329 | rq->errors = 1; |
330 | ide_end_drive_cmd(drive, stat, err); | |
331 | return ide_stopped; | |
332 | } | |
333 | ||
334 | if (rq->rq_disk) { | |
335 | ide_driver_t *drv; | |
336 | ||
337 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
338 | return drv->error(drive, rq, stat, err); | |
339 | } else | |
340 | return __ide_error(drive, rq, stat, err); | |
341 | } | |
342 | ||
343 | EXPORT_SYMBOL_GPL(ide_error); | |
344 | ||
57d7366b | 345 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 346 | { |
57d7366b BZ |
347 | tf->nsect = drive->sect; |
348 | tf->lbal = drive->sect; | |
349 | tf->lbam = drive->cyl; | |
350 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 351 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 352 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
353 | } |
354 | ||
57d7366b | 355 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 356 | { |
57d7366b | 357 | tf->nsect = drive->sect; |
aaaade3f | 358 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
359 | } |
360 | ||
57d7366b | 361 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 362 | { |
57d7366b | 363 | tf->nsect = drive->mult_req; |
aaaade3f | 364 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
365 | } |
366 | ||
367 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
368 | { | |
369 | special_t *s = &drive->special; | |
370 | ide_task_t args; | |
371 | ||
372 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 373 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
374 | |
375 | if (s->b.set_geometry) { | |
376 | s->b.set_geometry = 0; | |
57d7366b | 377 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
378 | } else if (s->b.recalibrate) { |
379 | s->b.recalibrate = 0; | |
57d7366b | 380 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
381 | } else if (s->b.set_multmode) { |
382 | s->b.set_multmode = 0; | |
57d7366b | 383 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
384 | } else if (s->all) { |
385 | int special = s->all; | |
386 | s->all = 0; | |
387 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
388 | return ide_stopped; | |
389 | } | |
390 | ||
657cc1a8 | 391 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 392 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 393 | |
1da177e4 LT |
394 | do_rw_taskfile(drive, &args); |
395 | ||
396 | return ide_started; | |
397 | } | |
398 | ||
399 | /** | |
400 | * do_special - issue some special commands | |
401 | * @drive: drive the command is for | |
402 | * | |
aaaade3f BZ |
403 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
404 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
405 | * | |
406 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
407 | */ |
408 | ||
409 | static ide_startstop_t do_special (ide_drive_t *drive) | |
410 | { | |
411 | special_t *s = &drive->special; | |
412 | ||
413 | #ifdef DEBUG | |
414 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
415 | #endif | |
6982daf7 BZ |
416 | if (drive->media == ide_disk) |
417 | return ide_disk_special(drive); | |
1da177e4 | 418 | |
6982daf7 BZ |
419 | s->all = 0; |
420 | drive->mult_req = 0; | |
421 | return ide_stopped; | |
1da177e4 LT |
422 | } |
423 | ||
424 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
425 | { | |
426 | ide_hwif_t *hwif = drive->hwif; | |
427 | struct scatterlist *sg = hwif->sg_table; | |
428 | ||
4aff5e23 | 429 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
430 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
431 | } else { | |
432 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); | |
433 | hwif->sg_nents = 1; | |
434 | } | |
435 | } | |
436 | ||
437 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
438 | ||
439 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
440 | { | |
441 | ide_hwif_t *hwif = drive->hwif; | |
442 | ||
443 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
444 | hwif->cursg_ofs = 0; |
445 | hwif->cursg = NULL; | |
1da177e4 LT |
446 | } |
447 | ||
448 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
449 | ||
450 | /** | |
451 | * execute_drive_command - issue special drive command | |
338cec32 | 452 | * @drive: the drive to issue the command on |
1da177e4 LT |
453 | * @rq: the request structure holding the command |
454 | * | |
455 | * execute_drive_cmd() issues a special drive command, usually | |
456 | * initiated by ioctl() from the external hdparm program. The | |
457 | * command can be a drive command, drive task or taskfile | |
458 | * operation. Weirdly you can call it with NULL to wait for | |
459 | * all commands to finish. Don't do this as that is due to change | |
460 | */ | |
461 | ||
462 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
463 | struct request *rq) | |
464 | { | |
465 | ide_hwif_t *hwif = HWIF(drive); | |
7267c337 | 466 | ide_task_t *task = rq->special; |
1da177e4 | 467 | |
7267c337 | 468 | if (task) { |
21d535c9 | 469 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
470 | |
471 | switch (hwif->data_phase) { | |
472 | case TASKFILE_MULTI_OUT: | |
473 | case TASKFILE_OUT: | |
474 | case TASKFILE_MULTI_IN: | |
475 | case TASKFILE_IN: | |
476 | ide_init_sg_cmd(drive, rq); | |
477 | ide_map_sg(drive, rq); | |
478 | default: | |
479 | break; | |
480 | } | |
74095a91 | 481 | |
21d535c9 BZ |
482 | return do_rw_taskfile(drive, task); |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* |
486 | * NULL is actually a valid way of waiting for | |
487 | * all current requests to be flushed from the queue. | |
488 | */ | |
489 | #ifdef DEBUG | |
490 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
491 | #endif | |
374e042c | 492 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 493 | ide_read_error(drive)); |
64a57fe4 | 494 | |
1da177e4 LT |
495 | return ide_stopped; |
496 | } | |
497 | ||
92f1f8fd EO |
498 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
499 | int arg) | |
500 | { | |
501 | struct request_queue *q = drive->queue; | |
502 | struct request *rq; | |
503 | int ret = 0; | |
504 | ||
505 | if (!(setting->flags & DS_SYNC)) | |
506 | return setting->set(drive, arg); | |
507 | ||
e415e495 | 508 | rq = blk_get_request(q, READ, __GFP_WAIT); |
92f1f8fd EO |
509 | rq->cmd_type = REQ_TYPE_SPECIAL; |
510 | rq->cmd_len = 5; | |
511 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
512 | *(int *)&rq->cmd[1] = arg; | |
513 | rq->special = setting->set; | |
514 | ||
515 | if (blk_execute_rq(q, NULL, rq, 0)) | |
516 | ret = rq->errors; | |
517 | blk_put_request(rq); | |
518 | ||
519 | return ret; | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(ide_devset_execute); | |
522 | ||
79e36a9f EO |
523 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
524 | { | |
4abdc6ee EO |
525 | u8 cmd = rq->cmd[0]; |
526 | ||
527 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { | |
528 | ide_task_t task; | |
529 | struct ide_taskfile *tf = &task.tf; | |
530 | ||
531 | memset(&task, 0, sizeof(task)); | |
532 | if (cmd == REQ_PARK_HEADS) { | |
533 | drive->sleep = *(unsigned long *)rq->special; | |
534 | drive->dev_flags |= IDE_DFLAG_SLEEPING; | |
535 | tf->command = ATA_CMD_IDLEIMMEDIATE; | |
536 | tf->feature = 0x44; | |
537 | tf->lbal = 0x4c; | |
538 | tf->lbam = 0x4e; | |
539 | tf->lbah = 0x55; | |
540 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; | |
541 | } else /* cmd == REQ_UNPARK_HEADS */ | |
542 | tf->command = ATA_CMD_CHK_POWER; | |
543 | ||
544 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; | |
545 | task.rq = rq; | |
546 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; | |
547 | return do_rw_taskfile(drive, &task); | |
548 | } | |
549 | ||
550 | switch (cmd) { | |
92f1f8fd EO |
551 | case REQ_DEVSET_EXEC: |
552 | { | |
553 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
554 | ||
555 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
556 | if (err) | |
557 | rq->errors = err; | |
558 | else | |
559 | err = 1; | |
560 | ide_end_request(drive, err, 0); | |
561 | return ide_stopped; | |
562 | } | |
79e36a9f EO |
563 | case REQ_DRIVE_RESET: |
564 | return ide_do_reset(drive); | |
565 | default: | |
566 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
567 | ide_end_request(drive, 0, 0); | |
568 | return ide_stopped; | |
569 | } | |
570 | } | |
571 | ||
1da177e4 LT |
572 | /** |
573 | * start_request - start of I/O and command issuing for IDE | |
574 | * | |
575 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 576 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
577 | * |
578 | * FIXME: this function needs a rename | |
579 | */ | |
580 | ||
581 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
582 | { | |
583 | ide_startstop_t startstop; | |
1da177e4 | 584 | |
4aff5e23 | 585 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
586 | |
587 | #ifdef DEBUG | |
588 | printk("%s: start_request: current=0x%08lx\n", | |
589 | HWIF(drive)->name, (unsigned long) rq); | |
590 | #endif | |
591 | ||
592 | /* bail early if we've exceeded max_failures */ | |
593 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 594 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
595 | goto kill_rq; |
596 | } | |
597 | ||
ad3cadda JA |
598 | if (blk_pm_request(rq)) |
599 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
600 | |
601 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
602 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
603 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
604 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
605 | return startstop; | |
606 | } | |
607 | if (!drive->special.all) { | |
608 | ide_driver_t *drv; | |
609 | ||
513daadd SS |
610 | /* |
611 | * We reset the drive so we need to issue a SETFEATURES. | |
612 | * Do it _after_ do_special() restored device parameters. | |
613 | */ | |
614 | if (drive->current_speed == 0xff) | |
615 | ide_config_drive_speed(drive, drive->desired_speed); | |
616 | ||
7267c337 | 617 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
618 | return execute_drive_cmd(drive, rq); |
619 | else if (blk_pm_request(rq)) { | |
c00895ab | 620 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
621 | #ifdef DEBUG_PM |
622 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 623 | drive->name, pm->pm_step); |
1da177e4 LT |
624 | #endif |
625 | startstop = ide_start_power_step(drive, rq); | |
626 | if (startstop == ide_stopped && | |
0d346ba0 | 627 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
628 | ide_complete_pm_request(drive, rq); |
629 | return startstop; | |
79e36a9f EO |
630 | } else if (!rq->rq_disk && blk_special_request(rq)) |
631 | /* | |
632 | * TODO: Once all ULDs have been modified to | |
633 | * check for specific op codes rather than | |
634 | * blindly accepting any special request, the | |
635 | * check for ->rq_disk above may be replaced | |
636 | * by a more suitable mechanism or even | |
637 | * dropped entirely. | |
638 | */ | |
639 | return ide_special_rq(drive, rq); | |
1da177e4 LT |
640 | |
641 | drv = *(ide_driver_t **)rq->rq_disk->private_data; | |
3c619ffd BZ |
642 | |
643 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
644 | } |
645 | return do_special(drive); | |
646 | kill_rq: | |
647 | ide_kill_rq(drive, rq); | |
648 | return ide_stopped; | |
649 | } | |
650 | ||
651 | /** | |
652 | * ide_stall_queue - pause an IDE device | |
653 | * @drive: drive to stall | |
654 | * @timeout: time to stall for (jiffies) | |
655 | * | |
656 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
657 | * to the hwgroup by sleeping for timeout jiffies. | |
658 | */ | |
659 | ||
660 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
661 | { | |
662 | if (timeout > WAIT_WORSTCASE) | |
663 | timeout = WAIT_WORSTCASE; | |
664 | drive->sleep = timeout + jiffies; | |
97100fc8 | 665 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 666 | } |
1da177e4 LT |
667 | EXPORT_SYMBOL(ide_stall_queue); |
668 | ||
1da177e4 LT |
669 | /* |
670 | * Issue a new request to a drive from hwgroup | |
1da177e4 LT |
671 | * |
672 | * A hwgroup is a serialized group of IDE interfaces. Usually there is | |
673 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) | |
674 | * may have both interfaces in a single hwgroup to "serialize" access. | |
675 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped | |
676 | * together into one hwgroup for serialized access. | |
677 | * | |
678 | * Note also that several hwgroups can end up sharing a single IRQ, | |
679 | * possibly along with many other devices. This is especially common in | |
680 | * PCI-based systems with off-board IDE controller cards. | |
681 | * | |
201bffa4 | 682 | * The IDE driver uses a per-hwgroup lock to protect the hwgroup->busy flag. |
1da177e4 LT |
683 | * |
684 | * The first thread into the driver for a particular hwgroup sets the | |
685 | * hwgroup->busy flag to indicate that this hwgroup is now active, | |
686 | * and then initiates processing of the top request from the request queue. | |
687 | * | |
688 | * Other threads attempting entry notice the busy setting, and will simply | |
689 | * queue their new requests and exit immediately. Note that hwgroup->busy | |
690 | * remains set even when the driver is merely awaiting the next interrupt. | |
691 | * Thus, the meaning is "this hwgroup is busy processing a request". | |
692 | * | |
693 | * When processing of a request completes, the completing thread or IRQ-handler | |
694 | * will start the next request from the queue. If no more work remains, | |
695 | * the driver will clear the hwgroup->busy flag and exit. | |
696 | * | |
2a2ca6a9 | 697 | * The per-hwgroup spinlock is used to protect all access to the |
1da177e4 LT |
698 | * hwgroup->busy flag, but is otherwise not needed for most processing in |
699 | * the driver. This makes the driver much more friendlier to shared IRQs | |
700 | * than previous designs, while remaining 100% (?) SMP safe and capable. | |
701 | */ | |
295f0004 | 702 | void do_ide_request(struct request_queue *q) |
1da177e4 | 703 | { |
201bffa4 BZ |
704 | ide_drive_t *drive = q->queuedata; |
705 | ide_hwif_t *hwif = drive->hwif; | |
706 | ide_hwgroup_t *hwgroup = hwif->hwgroup; | |
1da177e4 LT |
707 | struct request *rq; |
708 | ide_startstop_t startstop; | |
709 | ||
201bffa4 BZ |
710 | /* |
711 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
712 | * though that is 3 requests, it must be seen as a single transaction. | |
713 | * we must not preempt this drive until that is complete | |
714 | */ | |
715 | if (blk_queue_flushing(q)) | |
1da177e4 | 716 | /* |
201bffa4 BZ |
717 | * small race where queue could get replugged during |
718 | * the 3-request flush cycle, just yank the plug since | |
719 | * we want it to finish asap | |
1da177e4 | 720 | */ |
201bffa4 | 721 | blk_remove_plug(q); |
1da177e4 | 722 | |
201bffa4 BZ |
723 | spin_unlock_irq(q->queue_lock); |
724 | spin_lock_irq(&hwgroup->lock); | |
295f0004 | 725 | |
201bffa4 | 726 | if (!ide_lock_hwgroup(hwgroup)) { |
42cf2611 | 727 | ide_hwif_t *prev_port; |
201bffa4 | 728 | repeat: |
bd53cbcc | 729 | prev_port = hwif->host->cur_port; |
201bffa4 | 730 | hwgroup->rq = NULL; |
2fb21150 | 731 | |
201bffa4 BZ |
732 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
733 | if (time_before(drive->sleep, jiffies)) { | |
734 | ide_unlock_hwgroup(hwgroup); | |
735 | goto plug_device; | |
736 | } | |
737 | } | |
295f0004 | 738 | |
bd53cbcc BZ |
739 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
740 | hwif != prev_port) { | |
7299a391 | 741 | /* |
42cf2611 | 742 | * set nIEN for previous port, drives in the |
7299a391 BZ |
743 | * quirk_list may not like intr setups/cleanups |
744 | */ | |
bd53cbcc | 745 | if (prev_port && hwgroup->drive->quirk_list == 0) |
42cf2611 | 746 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
747 | |
748 | hwif->host->cur_port = hwif; | |
1da177e4 | 749 | } |
1da177e4 | 750 | hwgroup->drive = drive; |
4abdc6ee | 751 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 752 | |
201bffa4 BZ |
753 | spin_unlock_irq(&hwgroup->lock); |
754 | spin_lock_irq(q->queue_lock); | |
1da177e4 LT |
755 | /* |
756 | * we know that the queue isn't empty, but this can happen | |
757 | * if the q->prep_rq_fn() decides to kill a request | |
758 | */ | |
759 | rq = elv_next_request(drive->queue); | |
201bffa4 BZ |
760 | spin_unlock_irq(q->queue_lock); |
761 | spin_lock_irq(&hwgroup->lock); | |
762 | ||
1da177e4 | 763 | if (!rq) { |
631de370 | 764 | ide_unlock_hwgroup(hwgroup); |
201bffa4 | 765 | goto out; |
1da177e4 LT |
766 | } |
767 | ||
768 | /* | |
769 | * Sanity: don't accept a request that isn't a PM request | |
770 | * if we are currently power managed. This is very important as | |
771 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
772 | * above to return us whatever is in the queue. Since we call | |
773 | * ide_do_request() ourselves, we end up taking requests while | |
774 | * the queue is blocked... | |
775 | * | |
776 | * We let requests forced at head of queue with ide-preempt | |
777 | * though. I hope that doesn't happen too much, hopefully not | |
778 | * unless the subdriver triggers such a thing in its own PM | |
779 | * state machine. | |
780 | */ | |
97100fc8 BZ |
781 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
782 | blk_pm_request(rq) == 0 && | |
783 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 BZ |
784 | /* there should be no pending command at this point */ |
785 | ide_unlock_hwgroup(hwgroup); | |
295f0004 | 786 | goto plug_device; |
1da177e4 LT |
787 | } |
788 | ||
789 | hwgroup->rq = rq; | |
790 | ||
295f0004 | 791 | spin_unlock_irq(&hwgroup->lock); |
1da177e4 | 792 | startstop = start_request(drive, rq); |
2a2ca6a9 | 793 | spin_lock_irq(&hwgroup->lock); |
295f0004 | 794 | |
201bffa4 BZ |
795 | if (startstop == ide_stopped) |
796 | goto repeat; | |
797 | } else | |
798 | goto plug_device; | |
799 | out: | |
800 | spin_unlock_irq(&hwgroup->lock); | |
801 | spin_lock_irq(q->queue_lock); | |
295f0004 | 802 | return; |
1da177e4 | 803 | |
295f0004 | 804 | plug_device: |
201bffa4 BZ |
805 | spin_unlock_irq(&hwgroup->lock); |
806 | spin_lock_irq(q->queue_lock); | |
807 | ||
808 | if (!elv_queue_empty(q)) | |
809 | blk_plug_device(q); | |
1da177e4 LT |
810 | } |
811 | ||
812 | /* | |
813 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to | |
814 | * retry the current request in pio mode instead of risking tossing it | |
815 | * all away | |
816 | */ | |
817 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
818 | { | |
819 | ide_hwif_t *hwif = HWIF(drive); | |
820 | struct request *rq; | |
821 | ide_startstop_t ret = ide_stopped; | |
822 | ||
823 | /* | |
824 | * end current dma transaction | |
825 | */ | |
826 | ||
827 | if (error < 0) { | |
828 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 829 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 830 | ret = ide_error(drive, "dma timeout error", |
374e042c | 831 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
832 | } else { |
833 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 834 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
835 | } |
836 | ||
837 | /* | |
838 | * disable dma for now, but remember that we did so because of | |
839 | * a timeout -- we'll reenable after we finish this next request | |
840 | * (or rather the first chunk of it) in pio. | |
841 | */ | |
c3922048 | 842 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 843 | drive->retry_pio++; |
4a546e04 | 844 | ide_dma_off_quietly(drive); |
1da177e4 LT |
845 | |
846 | /* | |
847 | * un-busy drive etc (hwgroup->busy is cleared on return) and | |
848 | * make sure request is sane | |
849 | */ | |
850 | rq = HWGROUP(drive)->rq; | |
ce42f191 HZ |
851 | |
852 | if (!rq) | |
853 | goto out; | |
854 | ||
1da177e4 LT |
855 | HWGROUP(drive)->rq = NULL; |
856 | ||
857 | rq->errors = 0; | |
858 | ||
859 | if (!rq->bio) | |
860 | goto out; | |
861 | ||
862 | rq->sector = rq->bio->bi_sector; | |
863 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
864 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
865 | rq->buffer = bio_data(rq->bio); | |
866 | out: | |
867 | return ret; | |
868 | } | |
869 | ||
201bffa4 BZ |
870 | static void ide_plug_device(ide_drive_t *drive) |
871 | { | |
872 | struct request_queue *q = drive->queue; | |
873 | unsigned long flags; | |
874 | ||
875 | spin_lock_irqsave(q->queue_lock, flags); | |
876 | if (!elv_queue_empty(q)) | |
877 | blk_plug_device(q); | |
878 | spin_unlock_irqrestore(q->queue_lock, flags); | |
879 | } | |
880 | ||
1da177e4 LT |
881 | /** |
882 | * ide_timer_expiry - handle lack of an IDE interrupt | |
883 | * @data: timer callback magic (hwgroup) | |
884 | * | |
885 | * An IDE command has timed out before the expected drive return | |
886 | * occurred. At this point we attempt to clean up the current | |
887 | * mess. If the current handler includes an expiry handler then | |
888 | * we invoke the expiry handler, and providing it is happy the | |
889 | * work is done. If that fails we apply generic recovery rules | |
890 | * invoking the handler and checking the drive DMA status. We | |
891 | * have an excessively incestuous relationship with the DMA | |
892 | * logic that wants cleaning up. | |
893 | */ | |
894 | ||
895 | void ide_timer_expiry (unsigned long data) | |
896 | { | |
897 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; | |
201bffa4 | 898 | ide_drive_t *uninitialized_var(drive); |
1da177e4 LT |
899 | ide_handler_t *handler; |
900 | ide_expiry_t *expiry; | |
901 | unsigned long flags; | |
902 | unsigned long wait = -1; | |
201bffa4 | 903 | int plug_device = 0; |
1da177e4 | 904 | |
2a2ca6a9 | 905 | spin_lock_irqsave(&hwgroup->lock, flags); |
1da177e4 | 906 | |
23450319 SS |
907 | if (((handler = hwgroup->handler) == NULL) || |
908 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { | |
1da177e4 LT |
909 | /* |
910 | * Either a marginal timeout occurred | |
911 | * (got the interrupt just as timer expired), | |
912 | * or we were "sleeping" to give other devices a chance. | |
913 | * Either way, we don't really want to complain about anything. | |
914 | */ | |
1da177e4 | 915 | } else { |
201bffa4 | 916 | drive = hwgroup->drive; |
1da177e4 LT |
917 | if (!drive) { |
918 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); | |
919 | hwgroup->handler = NULL; | |
920 | } else { | |
921 | ide_hwif_t *hwif; | |
922 | ide_startstop_t startstop = ide_stopped; | |
b2cfb05a | 923 | |
1da177e4 LT |
924 | if ((expiry = hwgroup->expiry) != NULL) { |
925 | /* continue */ | |
926 | if ((wait = expiry(drive)) > 0) { | |
927 | /* reset timer */ | |
928 | hwgroup->timer.expires = jiffies + wait; | |
23450319 | 929 | hwgroup->req_gen_timer = hwgroup->req_gen; |
1da177e4 | 930 | add_timer(&hwgroup->timer); |
2a2ca6a9 | 931 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
1da177e4 LT |
932 | return; |
933 | } | |
934 | } | |
935 | hwgroup->handler = NULL; | |
936 | /* | |
937 | * We need to simulate a real interrupt when invoking | |
938 | * the handler() function, which means we need to | |
939 | * globally mask the specific IRQ: | |
940 | */ | |
2a2ca6a9 | 941 | spin_unlock(&hwgroup->lock); |
1da177e4 | 942 | hwif = HWIF(drive); |
1da177e4 LT |
943 | /* disable_irq_nosync ?? */ |
944 | disable_irq(hwif->irq); | |
1da177e4 LT |
945 | /* local CPU only, |
946 | * as if we were handling an interrupt */ | |
947 | local_irq_disable(); | |
948 | if (hwgroup->polling) { | |
949 | startstop = handler(drive); | |
950 | } else if (drive_is_ready(drive)) { | |
951 | if (drive->waiting_for_dma) | |
5e37bdc0 | 952 | hwif->dma_ops->dma_lost_irq(drive); |
1da177e4 LT |
953 | (void)ide_ack_intr(hwif); |
954 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); | |
955 | startstop = handler(drive); | |
956 | } else { | |
957 | if (drive->waiting_for_dma) { | |
958 | startstop = ide_dma_timeout_retry(drive, wait); | |
959 | } else | |
960 | startstop = | |
c47137a9 | 961 | ide_error(drive, "irq timeout", |
374e042c | 962 | hwif->tp_ops->read_status(hwif)); |
1da177e4 | 963 | } |
2a2ca6a9 | 964 | spin_lock_irq(&hwgroup->lock); |
1da177e4 | 965 | enable_irq(hwif->irq); |
295f0004 | 966 | if (startstop == ide_stopped) { |
631de370 | 967 | ide_unlock_hwgroup(hwgroup); |
201bffa4 | 968 | plug_device = 1; |
295f0004 | 969 | } |
1da177e4 LT |
970 | } |
971 | } | |
2a2ca6a9 | 972 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
201bffa4 BZ |
973 | |
974 | if (plug_device) | |
975 | ide_plug_device(drive); | |
1da177e4 LT |
976 | } |
977 | ||
978 | /** | |
979 | * unexpected_intr - handle an unexpected IDE interrupt | |
980 | * @irq: interrupt line | |
bd53cbcc | 981 | * @hwif: port being processed |
1da177e4 LT |
982 | * |
983 | * There's nothing really useful we can do with an unexpected interrupt, | |
984 | * other than reading the status register (to clear it), and logging it. | |
985 | * There should be no way that an irq can happen before we're ready for it, | |
986 | * so we needn't worry much about losing an "important" interrupt here. | |
987 | * | |
988 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
989 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
990 | * looks "good", we just ignore the interrupt completely. | |
991 | * | |
992 | * This routine assumes __cli() is in effect when called. | |
993 | * | |
994 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
995 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
996 | * we could screw up by interfering with a new request being set up for | |
997 | * irq15. | |
998 | * | |
999 | * In reality, this is a non-issue. The new command is not sent unless | |
1000 | * the drive is ready to accept one, in which case we know the drive is | |
1001 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1002 | * before completing the issuance of any new drive command, so we will not | |
1003 | * be accidentally invoked as a result of any valid command completion | |
1004 | * interrupt. | |
1005 | * | |
1006 | * Note that we must walk the entire hwgroup here. We know which hwif | |
1007 | * is doing the current command, but we don't know which hwif burped | |
1008 | * mysteriously. | |
1009 | */ | |
bd53cbcc BZ |
1010 | |
1011 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 1012 | { |
bd53cbcc | 1013 | ide_hwgroup_t *hwgroup = hwif->hwgroup; |
1da177e4 | 1014 | u8 stat; |
1da177e4 LT |
1015 | |
1016 | /* | |
1017 | * handle the unexpected interrupt | |
1018 | */ | |
1019 | do { | |
1020 | if (hwif->irq == irq) { | |
374e042c | 1021 | stat = hwif->tp_ops->read_status(hwif); |
b73c7ee2 | 1022 | |
3a7d2484 | 1023 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
1da177e4 LT |
1024 | /* Try to not flood the console with msgs */ |
1025 | static unsigned long last_msgtime, count; | |
1026 | ++count; | |
1027 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1028 | last_msgtime = jiffies; | |
1029 | printk(KERN_ERR "%s%s: unexpected interrupt, " | |
1030 | "status=0x%02x, count=%ld\n", | |
1031 | hwif->name, | |
1032 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); | |
1033 | } | |
1034 | } | |
1035 | } | |
1036 | } while ((hwif = hwif->next) != hwgroup->hwif); | |
1037 | } | |
1038 | ||
1039 | /** | |
1040 | * ide_intr - default IDE interrupt handler | |
1041 | * @irq: interrupt number | |
1042 | * @dev_id: hwif group | |
1043 | * @regs: unused weirdness from the kernel irq layer | |
1044 | * | |
1045 | * This is the default IRQ handler for the IDE layer. You should | |
1046 | * not need to override it. If you do be aware it is subtle in | |
1047 | * places | |
1048 | * | |
bd53cbcc | 1049 | * hwif is the interface in the group currently performing |
1da177e4 LT |
1050 | * a command. hwgroup->drive is the drive and hwgroup->handler is |
1051 | * the IRQ handler to call. As we issue a command the handlers | |
1052 | * step through multiple states, reassigning the handler to the | |
1053 | * next step in the process. Unlike a smart SCSI controller IDE | |
1054 | * expects the main processor to sequence the various transfer | |
1055 | * stages. We also manage a poll timer to catch up with most | |
1056 | * timeout situations. There are still a few where the handlers | |
1057 | * don't ever decide to give up. | |
1058 | * | |
1059 | * The handler eventually returns ide_stopped to indicate the | |
1060 | * request completed. At this point we issue the next request | |
1061 | * on the hwgroup and the process begins again. | |
1062 | */ | |
1063 | ||
7d12e780 | 1064 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 LT |
1065 | { |
1066 | unsigned long flags; | |
1067 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; | |
2a2ca6a9 | 1068 | ide_hwif_t *hwif = hwgroup->hwif; |
201bffa4 | 1069 | ide_drive_t *uninitialized_var(drive); |
1da177e4 LT |
1070 | ide_handler_t *handler; |
1071 | ide_startstop_t startstop; | |
3e0e29f7 | 1072 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 1073 | int plug_device = 0; |
1da177e4 | 1074 | |
bd53cbcc BZ |
1075 | if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) |
1076 | hwif = hwif->host->cur_port; | |
1077 | ||
2a2ca6a9 | 1078 | spin_lock_irqsave(&hwgroup->lock, flags); |
1da177e4 | 1079 | |
3e0e29f7 BZ |
1080 | if (!ide_ack_intr(hwif)) |
1081 | goto out; | |
1da177e4 LT |
1082 | |
1083 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { | |
1084 | /* | |
1085 | * Not expecting an interrupt from this drive. | |
1086 | * That means this could be: | |
1087 | * (1) an interrupt from another PCI device | |
1088 | * sharing the same PCI INT# as us. | |
1089 | * or (2) a drive just entered sleep or standby mode, | |
1090 | * and is interrupting to let us know. | |
1091 | * or (3) a spurious interrupt of unknown origin. | |
1092 | * | |
1093 | * For PCI, we cannot tell the difference, | |
1094 | * so in that case we just ignore it and hope it goes away. | |
1095 | * | |
1096 | * FIXME: unexpected_intr should be hwif-> then we can | |
1097 | * remove all the ifdef PCI crap | |
1098 | */ | |
1099 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1100 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1101 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1102 | { | |
1103 | /* | |
1104 | * Probably not a shared PCI interrupt, | |
1105 | * so we can safely try to do something about it: | |
1106 | */ | |
bd53cbcc | 1107 | unexpected_intr(irq, hwif); |
1da177e4 LT |
1108 | #ifdef CONFIG_BLK_DEV_IDEPCI |
1109 | } else { | |
1110 | /* | |
1111 | * Whack the status register, just in case | |
1112 | * we have a leftover pending IRQ. | |
1113 | */ | |
374e042c | 1114 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1115 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1116 | } | |
3e0e29f7 | 1117 | goto out; |
1da177e4 | 1118 | } |
3e0e29f7 | 1119 | |
1da177e4 LT |
1120 | drive = hwgroup->drive; |
1121 | if (!drive) { | |
1122 | /* | |
1123 | * This should NEVER happen, and there isn't much | |
1124 | * we could do about it here. | |
1125 | * | |
1126 | * [Note - this can occur if the drive is hot unplugged] | |
1127 | */ | |
3e0e29f7 | 1128 | goto out_handled; |
1da177e4 | 1129 | } |
3e0e29f7 BZ |
1130 | |
1131 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
1132 | /* |
1133 | * This happens regularly when we share a PCI IRQ with | |
1134 | * another device. Unfortunately, it can also happen | |
1135 | * with some buggy drives that trigger the IRQ before | |
1136 | * their status register is up to date. Hopefully we have | |
1137 | * enough advance overhead that the latter isn't a problem. | |
1138 | */ | |
3e0e29f7 BZ |
1139 | goto out; |
1140 | ||
1da177e4 | 1141 | hwgroup->handler = NULL; |
23450319 | 1142 | hwgroup->req_gen++; |
1da177e4 | 1143 | del_timer(&hwgroup->timer); |
2a2ca6a9 | 1144 | spin_unlock(&hwgroup->lock); |
1da177e4 | 1145 | |
bfa7d8e5 BZ |
1146 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1147 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1148 | |
97100fc8 | 1149 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1150 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1151 | |
1da177e4 LT |
1152 | /* service this interrupt, may set handler for next interrupt */ |
1153 | startstop = handler(drive); | |
1da177e4 | 1154 | |
2a2ca6a9 | 1155 | spin_lock_irq(&hwgroup->lock); |
1da177e4 LT |
1156 | /* |
1157 | * Note that handler() may have set things up for another | |
1158 | * interrupt to occur soon, but it cannot happen until | |
1159 | * we exit from this routine, because it will be the | |
1160 | * same irq as is currently being serviced here, and Linux | |
1161 | * won't allow another of the same (on any CPU) until we return. | |
1162 | */ | |
1da177e4 LT |
1163 | if (startstop == ide_stopped) { |
1164 | if (hwgroup->handler == NULL) { /* paranoia */ | |
631de370 | 1165 | ide_unlock_hwgroup(hwgroup); |
201bffa4 | 1166 | plug_device = 1; |
295f0004 BZ |
1167 | } else |
1168 | printk(KERN_ERR "%s: %s: huh? expected NULL handler " | |
1169 | "on exit\n", __func__, drive->name); | |
1da177e4 | 1170 | } |
3e0e29f7 BZ |
1171 | out_handled: |
1172 | irq_ret = IRQ_HANDLED; | |
1173 | out: | |
2a2ca6a9 | 1174 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
201bffa4 BZ |
1175 | |
1176 | if (plug_device) | |
1177 | ide_plug_device(drive); | |
1178 | ||
3e0e29f7 | 1179 | return irq_ret; |
1da177e4 LT |
1180 | } |
1181 | ||
1da177e4 LT |
1182 | /** |
1183 | * ide_do_drive_cmd - issue IDE special command | |
1184 | * @drive: device to issue command | |
1185 | * @rq: request to issue | |
1da177e4 LT |
1186 | * |
1187 | * This function issues a special IDE device request | |
1188 | * onto the request queue. | |
1189 | * | |
63f5abb0 FT |
1190 | * the rq is queued at the head of the request queue, displacing |
1191 | * the currently-being-processed request and this function | |
1192 | * returns immediately without waiting for the new rq to be | |
1193 | * completed. This is VERY DANGEROUS, and is intended for | |
1194 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1195 | */ |
63f5abb0 FT |
1196 | |
1197 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 | 1198 | { |
1d0bf587 | 1199 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
6ea52226 | 1200 | struct request_queue *q = drive->queue; |
1da177e4 | 1201 | unsigned long flags; |
e8a96aa7 | 1202 | |
63f5abb0 | 1203 | hwgroup->rq = NULL; |
1d0bf587 | 1204 | |
6ea52226 BZ |
1205 | spin_lock_irqsave(q->queue_lock, flags); |
1206 | __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0); | |
6ea52226 | 1207 | spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4 | 1208 | } |
1da177e4 | 1209 | EXPORT_SYMBOL(ide_do_drive_cmd); |
2fc57388 BZ |
1210 | |
1211 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) | |
1212 | { | |
6e6afb3b | 1213 | ide_hwif_t *hwif = drive->hwif; |
2fc57388 BZ |
1214 | ide_task_t task; |
1215 | ||
1216 | memset(&task, 0, sizeof(task)); | |
1217 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | | |
1218 | IDE_TFLAG_OUT_FEATURE | tf_flags; | |
1219 | task.tf.feature = dma; /* Use PIO/DMA */ | |
1220 | task.tf.lbam = bcount & 0xff; | |
1221 | task.tf.lbah = (bcount >> 8) & 0xff; | |
1222 | ||
089c5c7e | 1223 | ide_tf_dump(drive->name, &task.tf); |
374e042c | 1224 | hwif->tp_ops->set_irq(hwif, 1); |
ed4af48f | 1225 | SELECT_MASK(drive, 0); |
374e042c | 1226 | hwif->tp_ops->tf_load(drive, &task); |
2fc57388 BZ |
1227 | } |
1228 | ||
1229 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); | |
9f87abe8 BZ |
1230 | |
1231 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) | |
1232 | { | |
1233 | ide_hwif_t *hwif = drive->hwif; | |
1234 | u8 buf[4] = { 0 }; | |
1235 | ||
1236 | while (len > 0) { | |
1237 | if (write) | |
374e042c | 1238 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1239 | else |
374e042c | 1240 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1241 | len -= 4; |
1242 | } | |
1243 | } | |
1244 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |