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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) | |
b65fac32 | 91 | drive->hwif->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; |
b65fac32 | 110 | struct request *rq = drive->hwif->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 | { | |
b65fac32 BZ |
163 | ide_hwif_t *hwif = drive->hwif; |
164 | struct request *rq = hwif->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 | ||
b65fac32 | 189 | hwif->rq = NULL; |
1d0bf587 | 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) { | |
7f3c868b | 202 | struct ide_driver *drv; |
1da177e4 | 203 | |
7f3c868b | 204 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
1da177e4 LT |
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 | ||
627e05da | 294 | static ide_startstop_t |
1da177e4 LT |
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 | ||
1da177e4 LT |
302 | /** |
303 | * ide_error - handle an error on the IDE | |
304 | * @drive: drive the error occurred on | |
305 | * @msg: message to report | |
306 | * @stat: status bits | |
307 | * | |
308 | * ide_error() takes action based on the error returned by the drive. | |
309 | * For normal I/O that may well include retries. We deal with | |
310 | * both new-style (taskfile) and old style command handling here. | |
311 | * In the case of taskfile command handling there is work left to | |
312 | * do | |
313 | */ | |
314 | ||
315 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) | |
316 | { | |
317 | struct request *rq; | |
318 | u8 err; | |
319 | ||
320 | err = ide_dump_status(drive, msg, stat); | |
321 | ||
b65fac32 BZ |
322 | rq = drive->hwif->rq; |
323 | if (rq == NULL) | |
1da177e4 LT |
324 | return ide_stopped; |
325 | ||
326 | /* retry only "normal" I/O: */ | |
4aff5e23 | 327 | if (!blk_fs_request(rq)) { |
1da177e4 LT |
328 | rq->errors = 1; |
329 | ide_end_drive_cmd(drive, stat, err); | |
330 | return ide_stopped; | |
331 | } | |
332 | ||
627e05da | 333 | return __ide_error(drive, rq, stat, err); |
1da177e4 | 334 | } |
1da177e4 LT |
335 | EXPORT_SYMBOL_GPL(ide_error); |
336 | ||
57d7366b | 337 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 338 | { |
57d7366b BZ |
339 | tf->nsect = drive->sect; |
340 | tf->lbal = drive->sect; | |
341 | tf->lbam = drive->cyl; | |
342 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 343 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 344 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
345 | } |
346 | ||
57d7366b | 347 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 348 | { |
57d7366b | 349 | tf->nsect = drive->sect; |
aaaade3f | 350 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
351 | } |
352 | ||
57d7366b | 353 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 354 | { |
57d7366b | 355 | tf->nsect = drive->mult_req; |
aaaade3f | 356 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
357 | } |
358 | ||
359 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
360 | { | |
361 | special_t *s = &drive->special; | |
362 | ide_task_t args; | |
363 | ||
364 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 365 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
366 | |
367 | if (s->b.set_geometry) { | |
368 | s->b.set_geometry = 0; | |
57d7366b | 369 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
370 | } else if (s->b.recalibrate) { |
371 | s->b.recalibrate = 0; | |
57d7366b | 372 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
373 | } else if (s->b.set_multmode) { |
374 | s->b.set_multmode = 0; | |
57d7366b | 375 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
376 | } else if (s->all) { |
377 | int special = s->all; | |
378 | s->all = 0; | |
379 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
380 | return ide_stopped; | |
381 | } | |
382 | ||
657cc1a8 | 383 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 384 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 385 | |
1da177e4 LT |
386 | do_rw_taskfile(drive, &args); |
387 | ||
388 | return ide_started; | |
389 | } | |
390 | ||
391 | /** | |
392 | * do_special - issue some special commands | |
393 | * @drive: drive the command is for | |
394 | * | |
aaaade3f BZ |
395 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
396 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
397 | * | |
398 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
399 | */ |
400 | ||
401 | static ide_startstop_t do_special (ide_drive_t *drive) | |
402 | { | |
403 | special_t *s = &drive->special; | |
404 | ||
405 | #ifdef DEBUG | |
406 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
407 | #endif | |
6982daf7 BZ |
408 | if (drive->media == ide_disk) |
409 | return ide_disk_special(drive); | |
1da177e4 | 410 | |
6982daf7 BZ |
411 | s->all = 0; |
412 | drive->mult_req = 0; | |
413 | return ide_stopped; | |
1da177e4 LT |
414 | } |
415 | ||
416 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
417 | { | |
418 | ide_hwif_t *hwif = drive->hwif; | |
419 | struct scatterlist *sg = hwif->sg_table; | |
420 | ||
9e772d01 | 421 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
422 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
423 | hwif->sg_nents = 1; | |
9e772d01 BP |
424 | } else if (!rq->bio) { |
425 | sg_init_one(sg, rq->data, rq->data_len); | |
426 | hwif->sg_nents = 1; | |
427 | } else { | |
428 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 LT |
429 | } |
430 | } | |
431 | ||
432 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
433 | ||
434 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
435 | { | |
436 | ide_hwif_t *hwif = drive->hwif; | |
437 | ||
438 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
439 | hwif->cursg_ofs = 0; |
440 | hwif->cursg = NULL; | |
1da177e4 LT |
441 | } |
442 | ||
443 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
444 | ||
445 | /** | |
446 | * execute_drive_command - issue special drive command | |
338cec32 | 447 | * @drive: the drive to issue the command on |
1da177e4 LT |
448 | * @rq: the request structure holding the command |
449 | * | |
450 | * execute_drive_cmd() issues a special drive command, usually | |
451 | * initiated by ioctl() from the external hdparm program. The | |
452 | * command can be a drive command, drive task or taskfile | |
453 | * operation. Weirdly you can call it with NULL to wait for | |
454 | * all commands to finish. Don't do this as that is due to change | |
455 | */ | |
456 | ||
457 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
458 | struct request *rq) | |
459 | { | |
898ec223 | 460 | ide_hwif_t *hwif = drive->hwif; |
7267c337 | 461 | ide_task_t *task = rq->special; |
1da177e4 | 462 | |
7267c337 | 463 | if (task) { |
21d535c9 | 464 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
465 | |
466 | switch (hwif->data_phase) { | |
467 | case TASKFILE_MULTI_OUT: | |
468 | case TASKFILE_OUT: | |
469 | case TASKFILE_MULTI_IN: | |
470 | case TASKFILE_IN: | |
471 | ide_init_sg_cmd(drive, rq); | |
472 | ide_map_sg(drive, rq); | |
473 | default: | |
474 | break; | |
475 | } | |
74095a91 | 476 | |
21d535c9 BZ |
477 | return do_rw_taskfile(drive, task); |
478 | } | |
479 | ||
1da177e4 LT |
480 | /* |
481 | * NULL is actually a valid way of waiting for | |
482 | * all current requests to be flushed from the queue. | |
483 | */ | |
484 | #ifdef DEBUG | |
485 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
486 | #endif | |
374e042c | 487 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 488 | ide_read_error(drive)); |
64a57fe4 | 489 | |
1da177e4 LT |
490 | return ide_stopped; |
491 | } | |
492 | ||
92f1f8fd EO |
493 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
494 | int arg) | |
495 | { | |
496 | struct request_queue *q = drive->queue; | |
497 | struct request *rq; | |
498 | int ret = 0; | |
499 | ||
500 | if (!(setting->flags & DS_SYNC)) | |
501 | return setting->set(drive, arg); | |
502 | ||
e415e495 | 503 | rq = blk_get_request(q, READ, __GFP_WAIT); |
92f1f8fd EO |
504 | rq->cmd_type = REQ_TYPE_SPECIAL; |
505 | rq->cmd_len = 5; | |
506 | rq->cmd[0] = REQ_DEVSET_EXEC; | |
507 | *(int *)&rq->cmd[1] = arg; | |
508 | rq->special = setting->set; | |
509 | ||
510 | if (blk_execute_rq(q, NULL, rq, 0)) | |
511 | ret = rq->errors; | |
512 | blk_put_request(rq); | |
513 | ||
514 | return ret; | |
515 | } | |
92f1f8fd | 516 | |
79e36a9f EO |
517 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
518 | { | |
4abdc6ee EO |
519 | u8 cmd = rq->cmd[0]; |
520 | ||
521 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { | |
522 | ide_task_t task; | |
523 | struct ide_taskfile *tf = &task.tf; | |
524 | ||
525 | memset(&task, 0, sizeof(task)); | |
526 | if (cmd == REQ_PARK_HEADS) { | |
527 | drive->sleep = *(unsigned long *)rq->special; | |
528 | drive->dev_flags |= IDE_DFLAG_SLEEPING; | |
529 | tf->command = ATA_CMD_IDLEIMMEDIATE; | |
530 | tf->feature = 0x44; | |
531 | tf->lbal = 0x4c; | |
532 | tf->lbam = 0x4e; | |
533 | tf->lbah = 0x55; | |
534 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; | |
535 | } else /* cmd == REQ_UNPARK_HEADS */ | |
536 | tf->command = ATA_CMD_CHK_POWER; | |
537 | ||
538 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; | |
539 | task.rq = rq; | |
540 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; | |
541 | return do_rw_taskfile(drive, &task); | |
542 | } | |
543 | ||
544 | switch (cmd) { | |
92f1f8fd EO |
545 | case REQ_DEVSET_EXEC: |
546 | { | |
547 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; | |
548 | ||
549 | err = setfunc(drive, *(int *)&rq->cmd[1]); | |
550 | if (err) | |
551 | rq->errors = err; | |
552 | else | |
553 | err = 1; | |
554 | ide_end_request(drive, err, 0); | |
555 | return ide_stopped; | |
556 | } | |
79e36a9f EO |
557 | case REQ_DRIVE_RESET: |
558 | return ide_do_reset(drive); | |
559 | default: | |
560 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
561 | ide_end_request(drive, 0, 0); | |
562 | return ide_stopped; | |
563 | } | |
564 | } | |
565 | ||
1da177e4 LT |
566 | /** |
567 | * start_request - start of I/O and command issuing for IDE | |
568 | * | |
569 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 570 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
571 | * |
572 | * FIXME: this function needs a rename | |
573 | */ | |
574 | ||
575 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
576 | { | |
577 | ide_startstop_t startstop; | |
1da177e4 | 578 | |
4aff5e23 | 579 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
580 | |
581 | #ifdef DEBUG | |
582 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 583 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
584 | #endif |
585 | ||
586 | /* bail early if we've exceeded max_failures */ | |
587 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 588 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
589 | goto kill_rq; |
590 | } | |
591 | ||
ad3cadda JA |
592 | if (blk_pm_request(rq)) |
593 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
594 | |
595 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
596 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
597 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
598 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
599 | return startstop; | |
600 | } | |
601 | if (!drive->special.all) { | |
7f3c868b | 602 | struct ide_driver *drv; |
1da177e4 | 603 | |
513daadd SS |
604 | /* |
605 | * We reset the drive so we need to issue a SETFEATURES. | |
606 | * Do it _after_ do_special() restored device parameters. | |
607 | */ | |
608 | if (drive->current_speed == 0xff) | |
609 | ide_config_drive_speed(drive, drive->desired_speed); | |
610 | ||
7267c337 | 611 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
612 | return execute_drive_cmd(drive, rq); |
613 | else if (blk_pm_request(rq)) { | |
c00895ab | 614 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
615 | #ifdef DEBUG_PM |
616 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 617 | drive->name, pm->pm_step); |
1da177e4 LT |
618 | #endif |
619 | startstop = ide_start_power_step(drive, rq); | |
620 | if (startstop == ide_stopped && | |
0d346ba0 | 621 | pm->pm_step == IDE_PM_COMPLETED) |
1da177e4 LT |
622 | ide_complete_pm_request(drive, rq); |
623 | return startstop; | |
79e36a9f EO |
624 | } else if (!rq->rq_disk && blk_special_request(rq)) |
625 | /* | |
626 | * TODO: Once all ULDs have been modified to | |
627 | * check for specific op codes rather than | |
628 | * blindly accepting any special request, the | |
629 | * check for ->rq_disk above may be replaced | |
630 | * by a more suitable mechanism or even | |
631 | * dropped entirely. | |
632 | */ | |
633 | return ide_special_rq(drive, rq); | |
1da177e4 | 634 | |
7f3c868b | 635 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
636 | |
637 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
638 | } |
639 | return do_special(drive); | |
640 | kill_rq: | |
641 | ide_kill_rq(drive, rq); | |
642 | return ide_stopped; | |
643 | } | |
644 | ||
645 | /** | |
646 | * ide_stall_queue - pause an IDE device | |
647 | * @drive: drive to stall | |
648 | * @timeout: time to stall for (jiffies) | |
649 | * | |
650 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 651 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
652 | */ |
653 | ||
654 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
655 | { | |
656 | if (timeout > WAIT_WORSTCASE) | |
657 | timeout = WAIT_WORSTCASE; | |
658 | drive->sleep = timeout + jiffies; | |
97100fc8 | 659 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 660 | } |
1da177e4 LT |
661 | EXPORT_SYMBOL(ide_stall_queue); |
662 | ||
5b31f855 BZ |
663 | static inline int ide_lock_port(ide_hwif_t *hwif) |
664 | { | |
665 | if (hwif->busy) | |
666 | return 1; | |
667 | ||
668 | hwif->busy = 1; | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
674 | { | |
675 | hwif->busy = 0; | |
676 | } | |
677 | ||
678 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
679 | { | |
680 | int rc = 0; | |
681 | ||
682 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
683 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
684 | if (rc == 0) { | |
685 | /* for atari only */ | |
686 | ide_get_lock(ide_intr, hwif); | |
687 | } | |
688 | } | |
689 | return rc; | |
690 | } | |
691 | ||
692 | static inline void ide_unlock_host(struct ide_host *host) | |
693 | { | |
694 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
695 | /* for atari only */ | |
696 | ide_release_lock(); | |
697 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); | |
698 | } | |
699 | } | |
700 | ||
1da177e4 | 701 | /* |
b65fac32 | 702 | * Issue a new request to a device. |
1da177e4 | 703 | */ |
295f0004 | 704 | void do_ide_request(struct request_queue *q) |
1da177e4 | 705 | { |
201bffa4 BZ |
706 | ide_drive_t *drive = q->queuedata; |
707 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 708 | struct ide_host *host = hwif->host; |
5b31f855 | 709 | struct request *rq = NULL; |
1da177e4 LT |
710 | ide_startstop_t startstop; |
711 | ||
201bffa4 BZ |
712 | /* |
713 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
714 | * though that is 3 requests, it must be seen as a single transaction. | |
715 | * we must not preempt this drive until that is complete | |
716 | */ | |
717 | if (blk_queue_flushing(q)) | |
1da177e4 | 718 | /* |
201bffa4 BZ |
719 | * small race where queue could get replugged during |
720 | * the 3-request flush cycle, just yank the plug since | |
721 | * we want it to finish asap | |
1da177e4 | 722 | */ |
201bffa4 | 723 | blk_remove_plug(q); |
1da177e4 | 724 | |
201bffa4 | 725 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
726 | |
727 | if (ide_lock_host(host, hwif)) | |
728 | goto plug_device_2; | |
729 | ||
b65fac32 | 730 | spin_lock_irq(&hwif->lock); |
295f0004 | 731 | |
5b31f855 | 732 | if (!ide_lock_port(hwif)) { |
42cf2611 | 733 | ide_hwif_t *prev_port; |
201bffa4 | 734 | repeat: |
bd53cbcc | 735 | prev_port = hwif->host->cur_port; |
b65fac32 | 736 | hwif->rq = NULL; |
2fb21150 | 737 | |
201bffa4 BZ |
738 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
739 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 740 | ide_unlock_port(hwif); |
201bffa4 BZ |
741 | goto plug_device; |
742 | } | |
743 | } | |
295f0004 | 744 | |
bd53cbcc BZ |
745 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
746 | hwif != prev_port) { | |
7299a391 | 747 | /* |
42cf2611 | 748 | * set nIEN for previous port, drives in the |
7299a391 BZ |
749 | * quirk_list may not like intr setups/cleanups |
750 | */ | |
b65fac32 | 751 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 752 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
753 | |
754 | hwif->host->cur_port = hwif; | |
1da177e4 | 755 | } |
b65fac32 | 756 | hwif->cur_dev = drive; |
4abdc6ee | 757 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 758 | |
b65fac32 | 759 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 760 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
761 | /* |
762 | * we know that the queue isn't empty, but this can happen | |
763 | * if the q->prep_rq_fn() decides to kill a request | |
764 | */ | |
765 | rq = elv_next_request(drive->queue); | |
201bffa4 | 766 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 767 | spin_lock_irq(&hwif->lock); |
201bffa4 | 768 | |
1da177e4 | 769 | if (!rq) { |
5b31f855 | 770 | ide_unlock_port(hwif); |
201bffa4 | 771 | goto out; |
1da177e4 LT |
772 | } |
773 | ||
774 | /* | |
775 | * Sanity: don't accept a request that isn't a PM request | |
776 | * if we are currently power managed. This is very important as | |
777 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
778 | * above to return us whatever is in the queue. Since we call | |
779 | * ide_do_request() ourselves, we end up taking requests while | |
780 | * the queue is blocked... | |
781 | * | |
782 | * We let requests forced at head of queue with ide-preempt | |
783 | * though. I hope that doesn't happen too much, hopefully not | |
784 | * unless the subdriver triggers such a thing in its own PM | |
785 | * state machine. | |
786 | */ | |
97100fc8 BZ |
787 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
788 | blk_pm_request(rq) == 0 && | |
789 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 790 | /* there should be no pending command at this point */ |
5b31f855 | 791 | ide_unlock_port(hwif); |
295f0004 | 792 | goto plug_device; |
1da177e4 LT |
793 | } |
794 | ||
b65fac32 | 795 | hwif->rq = rq; |
1da177e4 | 796 | |
b65fac32 | 797 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 798 | startstop = start_request(drive, rq); |
b65fac32 | 799 | spin_lock_irq(&hwif->lock); |
295f0004 | 800 | |
201bffa4 BZ |
801 | if (startstop == ide_stopped) |
802 | goto repeat; | |
803 | } else | |
804 | goto plug_device; | |
805 | out: | |
b65fac32 | 806 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
807 | if (rq == NULL) |
808 | ide_unlock_host(host); | |
201bffa4 | 809 | spin_lock_irq(q->queue_lock); |
295f0004 | 810 | return; |
1da177e4 | 811 | |
295f0004 | 812 | plug_device: |
b65fac32 | 813 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
814 | ide_unlock_host(host); |
815 | plug_device_2: | |
201bffa4 BZ |
816 | spin_lock_irq(q->queue_lock); |
817 | ||
818 | if (!elv_queue_empty(q)) | |
819 | blk_plug_device(q); | |
1da177e4 LT |
820 | } |
821 | ||
822 | /* | |
b65fac32 | 823 | * un-busy the port etc, and clear any pending DMA status. we want to |
1da177e4 LT |
824 | * retry the current request in pio mode instead of risking tossing it |
825 | * all away | |
826 | */ | |
827 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) | |
828 | { | |
898ec223 | 829 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 LT |
830 | struct request *rq; |
831 | ide_startstop_t ret = ide_stopped; | |
832 | ||
833 | /* | |
834 | * end current dma transaction | |
835 | */ | |
836 | ||
837 | if (error < 0) { | |
838 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); | |
5e37bdc0 | 839 | (void)hwif->dma_ops->dma_end(drive); |
1da177e4 | 840 | ret = ide_error(drive, "dma timeout error", |
374e042c | 841 | hwif->tp_ops->read_status(hwif)); |
1da177e4 LT |
842 | } else { |
843 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); | |
5e37bdc0 | 844 | hwif->dma_ops->dma_timeout(drive); |
1da177e4 LT |
845 | } |
846 | ||
847 | /* | |
848 | * disable dma for now, but remember that we did so because of | |
849 | * a timeout -- we'll reenable after we finish this next request | |
850 | * (or rather the first chunk of it) in pio. | |
851 | */ | |
c3922048 | 852 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
1da177e4 | 853 | drive->retry_pio++; |
4a546e04 | 854 | ide_dma_off_quietly(drive); |
1da177e4 LT |
855 | |
856 | /* | |
5b31f855 | 857 | * un-busy drive etc and make sure request is sane |
1da177e4 | 858 | */ |
5b31f855 | 859 | |
b65fac32 | 860 | rq = hwif->rq; |
ce42f191 HZ |
861 | if (!rq) |
862 | goto out; | |
863 | ||
b65fac32 | 864 | hwif->rq = NULL; |
1da177e4 LT |
865 | |
866 | rq->errors = 0; | |
867 | ||
868 | if (!rq->bio) | |
869 | goto out; | |
870 | ||
871 | rq->sector = rq->bio->bi_sector; | |
872 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; | |
873 | rq->hard_cur_sectors = rq->current_nr_sectors; | |
874 | rq->buffer = bio_data(rq->bio); | |
875 | out: | |
876 | return ret; | |
877 | } | |
878 | ||
201bffa4 BZ |
879 | static void ide_plug_device(ide_drive_t *drive) |
880 | { | |
881 | struct request_queue *q = drive->queue; | |
882 | unsigned long flags; | |
883 | ||
884 | spin_lock_irqsave(q->queue_lock, flags); | |
885 | if (!elv_queue_empty(q)) | |
886 | blk_plug_device(q); | |
887 | spin_unlock_irqrestore(q->queue_lock, flags); | |
888 | } | |
889 | ||
b6a45a0b BZ |
890 | static int drive_is_ready(ide_drive_t *drive) |
891 | { | |
892 | ide_hwif_t *hwif = drive->hwif; | |
893 | u8 stat = 0; | |
894 | ||
895 | if (drive->waiting_for_dma) | |
896 | return hwif->dma_ops->dma_test_irq(drive); | |
897 | ||
898 | if (hwif->io_ports.ctl_addr && | |
899 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
900 | stat = hwif->tp_ops->read_altstatus(hwif); | |
901 | else | |
902 | /* Note: this may clear a pending IRQ!! */ | |
903 | stat = hwif->tp_ops->read_status(hwif); | |
904 | ||
905 | if (stat & ATA_BUSY) | |
906 | /* drive busy: definitely not interrupting */ | |
907 | return 0; | |
908 | ||
909 | /* drive ready: *might* be interrupting */ | |
910 | return 1; | |
911 | } | |
912 | ||
1da177e4 LT |
913 | /** |
914 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 915 | * @data: timer callback magic (hwif) |
1da177e4 LT |
916 | * |
917 | * An IDE command has timed out before the expected drive return | |
918 | * occurred. At this point we attempt to clean up the current | |
919 | * mess. If the current handler includes an expiry handler then | |
920 | * we invoke the expiry handler, and providing it is happy the | |
921 | * work is done. If that fails we apply generic recovery rules | |
922 | * invoking the handler and checking the drive DMA status. We | |
923 | * have an excessively incestuous relationship with the DMA | |
924 | * logic that wants cleaning up. | |
925 | */ | |
926 | ||
927 | void ide_timer_expiry (unsigned long data) | |
928 | { | |
b65fac32 | 929 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 930 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 931 | ide_handler_t *handler; |
1da177e4 | 932 | unsigned long flags; |
e0c6dcd8 | 933 | int wait = -1; |
201bffa4 | 934 | int plug_device = 0; |
1da177e4 | 935 | |
b65fac32 BZ |
936 | spin_lock_irqsave(&hwif->lock, flags); |
937 | ||
938 | handler = hwif->handler; | |
1da177e4 | 939 | |
b65fac32 | 940 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
941 | /* |
942 | * Either a marginal timeout occurred | |
943 | * (got the interrupt just as timer expired), | |
944 | * or we were "sleeping" to give other devices a chance. | |
945 | * Either way, we don't really want to complain about anything. | |
946 | */ | |
1da177e4 | 947 | } else { |
c38714ed BZ |
948 | ide_expiry_t *expiry = hwif->expiry; |
949 | ide_startstop_t startstop = ide_stopped; | |
950 | ||
b65fac32 | 951 | drive = hwif->cur_dev; |
c38714ed BZ |
952 | |
953 | if (expiry) { | |
954 | wait = expiry(drive); | |
955 | if (wait > 0) { /* continue */ | |
956 | /* reset timer */ | |
957 | hwif->timer.expires = jiffies + wait; | |
958 | hwif->req_gen_timer = hwif->req_gen; | |
959 | add_timer(&hwif->timer); | |
960 | spin_unlock_irqrestore(&hwif->lock, flags); | |
961 | return; | |
295f0004 | 962 | } |
1da177e4 | 963 | } |
c38714ed BZ |
964 | hwif->handler = NULL; |
965 | /* | |
966 | * We need to simulate a real interrupt when invoking | |
967 | * the handler() function, which means we need to | |
968 | * globally mask the specific IRQ: | |
969 | */ | |
970 | spin_unlock(&hwif->lock); | |
971 | /* disable_irq_nosync ?? */ | |
972 | disable_irq(hwif->irq); | |
973 | /* local CPU only, as if we were handling an interrupt */ | |
974 | local_irq_disable(); | |
975 | if (hwif->polling) { | |
976 | startstop = handler(drive); | |
977 | } else if (drive_is_ready(drive)) { | |
978 | if (drive->waiting_for_dma) | |
979 | hwif->dma_ops->dma_lost_irq(drive); | |
980 | (void)ide_ack_intr(hwif); | |
981 | printk(KERN_WARNING "%s: lost interrupt\n", | |
982 | drive->name); | |
983 | startstop = handler(drive); | |
984 | } else { | |
985 | if (drive->waiting_for_dma) | |
986 | startstop = ide_dma_timeout_retry(drive, wait); | |
987 | else | |
988 | startstop = ide_error(drive, "irq timeout", | |
989 | hwif->tp_ops->read_status(hwif)); | |
990 | } | |
991 | spin_lock_irq(&hwif->lock); | |
992 | enable_irq(hwif->irq); | |
993 | if (startstop == ide_stopped) { | |
994 | ide_unlock_port(hwif); | |
995 | plug_device = 1; | |
996 | } | |
1da177e4 | 997 | } |
b65fac32 | 998 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 999 | |
5b31f855 BZ |
1000 | if (plug_device) { |
1001 | ide_unlock_host(hwif->host); | |
201bffa4 | 1002 | ide_plug_device(drive); |
5b31f855 | 1003 | } |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | /** | |
1007 | * unexpected_intr - handle an unexpected IDE interrupt | |
1008 | * @irq: interrupt line | |
bd53cbcc | 1009 | * @hwif: port being processed |
1da177e4 LT |
1010 | * |
1011 | * There's nothing really useful we can do with an unexpected interrupt, | |
1012 | * other than reading the status register (to clear it), and logging it. | |
1013 | * There should be no way that an irq can happen before we're ready for it, | |
1014 | * so we needn't worry much about losing an "important" interrupt here. | |
1015 | * | |
1016 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
1017 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
1018 | * looks "good", we just ignore the interrupt completely. | |
1019 | * | |
1020 | * This routine assumes __cli() is in effect when called. | |
1021 | * | |
1022 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
1023 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
1024 | * we could screw up by interfering with a new request being set up for | |
1025 | * irq15. | |
1026 | * | |
1027 | * In reality, this is a non-issue. The new command is not sent unless | |
1028 | * the drive is ready to accept one, in which case we know the drive is | |
1029 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
1030 | * before completing the issuance of any new drive command, so we will not | |
1031 | * be accidentally invoked as a result of any valid command completion | |
1032 | * interrupt. | |
1da177e4 | 1033 | */ |
bd53cbcc BZ |
1034 | |
1035 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 1036 | { |
ae86afae BZ |
1037 | u8 stat = hwif->tp_ops->read_status(hwif); |
1038 | ||
1039 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
1040 | /* Try to not flood the console with msgs */ | |
1041 | static unsigned long last_msgtime, count; | |
1042 | ++count; | |
1043 | ||
1044 | if (time_after(jiffies, last_msgtime + HZ)) { | |
1045 | last_msgtime = jiffies; | |
1046 | printk(KERN_ERR "%s: unexpected interrupt, " | |
1047 | "status=0x%02x, count=%ld\n", | |
1048 | hwif->name, stat, count); | |
1da177e4 | 1049 | } |
ae86afae | 1050 | } |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | /** | |
1054 | * ide_intr - default IDE interrupt handler | |
1055 | * @irq: interrupt number | |
ae86afae | 1056 | * @dev_id: hwif |
1da177e4 LT |
1057 | * @regs: unused weirdness from the kernel irq layer |
1058 | * | |
1059 | * This is the default IRQ handler for the IDE layer. You should | |
1060 | * not need to override it. If you do be aware it is subtle in | |
1061 | * places | |
1062 | * | |
bd53cbcc | 1063 | * hwif is the interface in the group currently performing |
b65fac32 | 1064 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
1065 | * the IRQ handler to call. As we issue a command the handlers |
1066 | * step through multiple states, reassigning the handler to the | |
1067 | * next step in the process. Unlike a smart SCSI controller IDE | |
1068 | * expects the main processor to sequence the various transfer | |
1069 | * stages. We also manage a poll timer to catch up with most | |
1070 | * timeout situations. There are still a few where the handlers | |
1071 | * don't ever decide to give up. | |
1072 | * | |
1073 | * The handler eventually returns ide_stopped to indicate the | |
1074 | * request completed. At this point we issue the next request | |
b65fac32 | 1075 | * on the port and the process begins again. |
1da177e4 | 1076 | */ |
b65fac32 | 1077 | |
7d12e780 | 1078 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 1079 | { |
ae86afae | 1080 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
201bffa4 | 1081 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 1082 | ide_handler_t *handler; |
ae86afae | 1083 | unsigned long flags; |
1da177e4 | 1084 | ide_startstop_t startstop; |
3e0e29f7 | 1085 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 1086 | int plug_device = 0; |
1da177e4 | 1087 | |
ae86afae BZ |
1088 | if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) { |
1089 | if (hwif != hwif->host->cur_port) | |
1090 | goto out_early; | |
1091 | } | |
bd53cbcc | 1092 | |
b65fac32 | 1093 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 1094 | |
3e0e29f7 BZ |
1095 | if (!ide_ack_intr(hwif)) |
1096 | goto out; | |
1da177e4 | 1097 | |
b65fac32 BZ |
1098 | handler = hwif->handler; |
1099 | ||
1100 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
1101 | /* |
1102 | * Not expecting an interrupt from this drive. | |
1103 | * That means this could be: | |
1104 | * (1) an interrupt from another PCI device | |
1105 | * sharing the same PCI INT# as us. | |
1106 | * or (2) a drive just entered sleep or standby mode, | |
1107 | * and is interrupting to let us know. | |
1108 | * or (3) a spurious interrupt of unknown origin. | |
1109 | * | |
1110 | * For PCI, we cannot tell the difference, | |
1111 | * so in that case we just ignore it and hope it goes away. | |
1112 | * | |
1113 | * FIXME: unexpected_intr should be hwif-> then we can | |
1114 | * remove all the ifdef PCI crap | |
1115 | */ | |
1116 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
425afb61 | 1117 | if (hwif->chipset != ide_pci) |
1da177e4 LT |
1118 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1119 | { | |
1120 | /* | |
1121 | * Probably not a shared PCI interrupt, | |
1122 | * so we can safely try to do something about it: | |
1123 | */ | |
bd53cbcc | 1124 | unexpected_intr(irq, hwif); |
1da177e4 LT |
1125 | #ifdef CONFIG_BLK_DEV_IDEPCI |
1126 | } else { | |
1127 | /* | |
1128 | * Whack the status register, just in case | |
1129 | * we have a leftover pending IRQ. | |
1130 | */ | |
374e042c | 1131 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 LT |
1132 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
1133 | } | |
3e0e29f7 | 1134 | goto out; |
1da177e4 | 1135 | } |
3e0e29f7 | 1136 | |
b65fac32 | 1137 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
1138 | |
1139 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
1140 | /* |
1141 | * This happens regularly when we share a PCI IRQ with | |
1142 | * another device. Unfortunately, it can also happen | |
1143 | * with some buggy drives that trigger the IRQ before | |
1144 | * their status register is up to date. Hopefully we have | |
1145 | * enough advance overhead that the latter isn't a problem. | |
1146 | */ | |
3e0e29f7 BZ |
1147 | goto out; |
1148 | ||
b65fac32 BZ |
1149 | hwif->handler = NULL; |
1150 | hwif->req_gen++; | |
1151 | del_timer(&hwif->timer); | |
1152 | spin_unlock(&hwif->lock); | |
1da177e4 | 1153 | |
bfa7d8e5 BZ |
1154 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
1155 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 1156 | |
97100fc8 | 1157 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 1158 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 1159 | |
1da177e4 LT |
1160 | /* service this interrupt, may set handler for next interrupt */ |
1161 | startstop = handler(drive); | |
1da177e4 | 1162 | |
b65fac32 | 1163 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
1164 | /* |
1165 | * Note that handler() may have set things up for another | |
1166 | * interrupt to occur soon, but it cannot happen until | |
1167 | * we exit from this routine, because it will be the | |
1168 | * same irq as is currently being serviced here, and Linux | |
1169 | * won't allow another of the same (on any CPU) until we return. | |
1170 | */ | |
1da177e4 | 1171 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
1172 | BUG_ON(hwif->handler); |
1173 | ide_unlock_port(hwif); | |
1174 | plug_device = 1; | |
1da177e4 | 1175 | } |
3e0e29f7 BZ |
1176 | irq_ret = IRQ_HANDLED; |
1177 | out: | |
b65fac32 | 1178 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 1179 | out_early: |
5b31f855 BZ |
1180 | if (plug_device) { |
1181 | ide_unlock_host(hwif->host); | |
201bffa4 | 1182 | ide_plug_device(drive); |
5b31f855 | 1183 | } |
201bffa4 | 1184 | |
3e0e29f7 | 1185 | return irq_ret; |
1da177e4 | 1186 | } |
849d7130 | 1187 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 1188 | |
1da177e4 LT |
1189 | /** |
1190 | * ide_do_drive_cmd - issue IDE special command | |
1191 | * @drive: device to issue command | |
1192 | * @rq: request to issue | |
1da177e4 LT |
1193 | * |
1194 | * This function issues a special IDE device request | |
1195 | * onto the request queue. | |
1196 | * | |
63f5abb0 FT |
1197 | * the rq is queued at the head of the request queue, displacing |
1198 | * the currently-being-processed request and this function | |
1199 | * returns immediately without waiting for the new rq to be | |
1200 | * completed. This is VERY DANGEROUS, and is intended for | |
1201 | * careful use by the ATAPI tape/cdrom driver code. | |
1da177e4 | 1202 | */ |
63f5abb0 FT |
1203 | |
1204 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) | |
1da177e4 | 1205 | { |
6ea52226 | 1206 | struct request_queue *q = drive->queue; |
1da177e4 | 1207 | unsigned long flags; |
e8a96aa7 | 1208 | |
b65fac32 | 1209 | drive->hwif->rq = NULL; |
1d0bf587 | 1210 | |
6ea52226 BZ |
1211 | spin_lock_irqsave(q->queue_lock, flags); |
1212 | __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0); | |
6ea52226 | 1213 | spin_unlock_irqrestore(q->queue_lock, flags); |
1da177e4 | 1214 | } |
1da177e4 | 1215 | EXPORT_SYMBOL(ide_do_drive_cmd); |
2fc57388 | 1216 | |
9f87abe8 BZ |
1217 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
1218 | { | |
1219 | ide_hwif_t *hwif = drive->hwif; | |
1220 | u8 buf[4] = { 0 }; | |
1221 | ||
1222 | while (len > 0) { | |
1223 | if (write) | |
374e042c | 1224 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 1225 | else |
374e042c | 1226 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
1227 | len -= 4; |
1228 | } | |
1229 | } | |
1230 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |