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 | ||
22aa4b32 | 147 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 148 | { |
22aa4b32 BZ |
149 | struct ide_taskfile *tf = &cmd->tf; |
150 | struct request *rq = cmd->rq; | |
e120237c BZ |
151 | |
152 | tf->error = err; | |
153 | tf->status = stat; | |
154 | ||
22aa4b32 | 155 | drive->hwif->tp_ops->tf_read(drive, cmd); |
e120237c | 156 | |
a09485df | 157 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
22aa4b32 | 158 | memcpy(rq->special, cmd, sizeof(*cmd)); |
a09485df | 159 | |
22aa4b32 BZ |
160 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
161 | kfree(cmd); | |
e120237c BZ |
162 | } |
163 | ||
a09485df | 164 | void ide_complete_rq(ide_drive_t *drive, u8 err) |
1da177e4 | 165 | { |
b65fac32 BZ |
166 | ide_hwif_t *hwif = drive->hwif; |
167 | struct request *rq = hwif->rq; | |
1da177e4 | 168 | |
b65fac32 | 169 | hwif->rq = NULL; |
1d0bf587 | 170 | |
1da177e4 | 171 | rq->errors = err; |
1d0bf587 | 172 | |
3c8a2cce BZ |
173 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
174 | blk_rq_bytes(rq)))) | |
5e36bb6e | 175 | BUG(); |
1da177e4 | 176 | } |
a09485df | 177 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 178 | |
327fa1c2 | 179 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 180 | { |
3ee38302 BZ |
181 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
182 | u8 media = drive->media; | |
183 | ||
c152cc1a BZ |
184 | drive->failed_pc = NULL; |
185 | ||
3ee38302 | 186 | if ((media == ide_floppy && drv_req) || media == ide_tape) |
c152cc1a BZ |
187 | rq->errors = IDE_DRV_ERROR_GENERAL; |
188 | ||
3ee38302 BZ |
189 | if ((media == ide_floppy || media == ide_tape) && drv_req) |
190 | ide_complete_rq(drive, 0); | |
191 | else | |
1da177e4 LT |
192 | ide_end_request(drive, 0, 0); |
193 | } | |
194 | ||
57d7366b | 195 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 196 | { |
57d7366b BZ |
197 | tf->nsect = drive->sect; |
198 | tf->lbal = drive->sect; | |
199 | tf->lbam = drive->cyl; | |
200 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 201 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 202 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
203 | } |
204 | ||
57d7366b | 205 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 206 | { |
57d7366b | 207 | tf->nsect = drive->sect; |
aaaade3f | 208 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
209 | } |
210 | ||
57d7366b | 211 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 212 | { |
57d7366b | 213 | tf->nsect = drive->mult_req; |
aaaade3f | 214 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
215 | } |
216 | ||
217 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
218 | { | |
219 | special_t *s = &drive->special; | |
22aa4b32 | 220 | struct ide_cmd cmd; |
1da177e4 | 221 | |
22aa4b32 BZ |
222 | memset(&cmd, 0, sizeof(cmd)); |
223 | cmd.data_phase = TASKFILE_NO_DATA; | |
1da177e4 LT |
224 | |
225 | if (s->b.set_geometry) { | |
226 | s->b.set_geometry = 0; | |
22aa4b32 | 227 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
1da177e4 LT |
228 | } else if (s->b.recalibrate) { |
229 | s->b.recalibrate = 0; | |
22aa4b32 | 230 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
1da177e4 LT |
231 | } else if (s->b.set_multmode) { |
232 | s->b.set_multmode = 0; | |
22aa4b32 | 233 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
1da177e4 LT |
234 | } else if (s->all) { |
235 | int special = s->all; | |
236 | s->all = 0; | |
237 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
238 | return ide_stopped; | |
239 | } | |
240 | ||
22aa4b32 BZ |
241 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
242 | IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 243 | |
22aa4b32 | 244 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
245 | |
246 | return ide_started; | |
247 | } | |
248 | ||
249 | /** | |
250 | * do_special - issue some special commands | |
251 | * @drive: drive the command is for | |
252 | * | |
aaaade3f BZ |
253 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
254 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
255 | * | |
256 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
257 | */ |
258 | ||
259 | static ide_startstop_t do_special (ide_drive_t *drive) | |
260 | { | |
261 | special_t *s = &drive->special; | |
262 | ||
263 | #ifdef DEBUG | |
264 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
265 | #endif | |
6982daf7 BZ |
266 | if (drive->media == ide_disk) |
267 | return ide_disk_special(drive); | |
1da177e4 | 268 | |
6982daf7 BZ |
269 | s->all = 0; |
270 | drive->mult_req = 0; | |
271 | return ide_stopped; | |
1da177e4 LT |
272 | } |
273 | ||
274 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
275 | { | |
276 | ide_hwif_t *hwif = drive->hwif; | |
277 | struct scatterlist *sg = hwif->sg_table; | |
278 | ||
9e772d01 | 279 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
280 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
281 | hwif->sg_nents = 1; | |
9e772d01 BP |
282 | } else if (!rq->bio) { |
283 | sg_init_one(sg, rq->data, rq->data_len); | |
284 | hwif->sg_nents = 1; | |
285 | } else { | |
286 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 LT |
287 | } |
288 | } | |
289 | ||
290 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
291 | ||
292 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
293 | { | |
294 | ide_hwif_t *hwif = drive->hwif; | |
295 | ||
296 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
297 | hwif->cursg_ofs = 0; |
298 | hwif->cursg = NULL; | |
1da177e4 LT |
299 | } |
300 | ||
301 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
302 | ||
303 | /** | |
304 | * execute_drive_command - issue special drive command | |
338cec32 | 305 | * @drive: the drive to issue the command on |
1da177e4 LT |
306 | * @rq: the request structure holding the command |
307 | * | |
308 | * execute_drive_cmd() issues a special drive command, usually | |
309 | * initiated by ioctl() from the external hdparm program. The | |
310 | * command can be a drive command, drive task or taskfile | |
311 | * operation. Weirdly you can call it with NULL to wait for | |
312 | * all commands to finish. Don't do this as that is due to change | |
313 | */ | |
314 | ||
315 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
316 | struct request *rq) | |
317 | { | |
22aa4b32 | 318 | struct ide_cmd *cmd = rq->special; |
1da177e4 | 319 | |
22aa4b32 BZ |
320 | if (cmd) { |
321 | switch (cmd->data_phase) { | |
1da177e4 LT |
322 | case TASKFILE_MULTI_OUT: |
323 | case TASKFILE_OUT: | |
324 | case TASKFILE_MULTI_IN: | |
325 | case TASKFILE_IN: | |
326 | ide_init_sg_cmd(drive, rq); | |
327 | ide_map_sg(drive, rq); | |
328 | default: | |
329 | break; | |
330 | } | |
74095a91 | 331 | |
22aa4b32 | 332 | return do_rw_taskfile(drive, cmd); |
21d535c9 BZ |
333 | } |
334 | ||
1da177e4 LT |
335 | /* |
336 | * NULL is actually a valid way of waiting for | |
337 | * all current requests to be flushed from the queue. | |
338 | */ | |
339 | #ifdef DEBUG | |
340 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
341 | #endif | |
5e76acd5 | 342 | ide_complete_rq(drive, 0); |
64a57fe4 | 343 | |
1da177e4 | 344 | return ide_stopped; |
1bc6daae BZ |
345 | } |
346 | ||
79e36a9f EO |
347 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
348 | { | |
4abdc6ee EO |
349 | u8 cmd = rq->cmd[0]; |
350 | ||
4abdc6ee | 351 | switch (cmd) { |
1bc6daae BZ |
352 | case REQ_PARK_HEADS: |
353 | case REQ_UNPARK_HEADS: | |
354 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 355 | case REQ_DEVSET_EXEC: |
1bc6daae | 356 | return ide_do_devset(drive, rq); |
79e36a9f EO |
357 | case REQ_DRIVE_RESET: |
358 | return ide_do_reset(drive); | |
359 | default: | |
360 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
361 | ide_end_request(drive, 0, 0); | |
362 | return ide_stopped; | |
363 | } | |
364 | } | |
365 | ||
1da177e4 LT |
366 | /** |
367 | * start_request - start of I/O and command issuing for IDE | |
368 | * | |
369 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 370 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
371 | * |
372 | * FIXME: this function needs a rename | |
373 | */ | |
374 | ||
375 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
376 | { | |
377 | ide_startstop_t startstop; | |
1da177e4 | 378 | |
4aff5e23 | 379 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
380 | |
381 | #ifdef DEBUG | |
382 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 383 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
384 | #endif |
385 | ||
386 | /* bail early if we've exceeded max_failures */ | |
387 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 388 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
389 | goto kill_rq; |
390 | } | |
391 | ||
ad3cadda JA |
392 | if (blk_pm_request(rq)) |
393 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
394 | |
395 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
396 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
397 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
398 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
399 | return startstop; | |
400 | } | |
401 | if (!drive->special.all) { | |
7f3c868b | 402 | struct ide_driver *drv; |
1da177e4 | 403 | |
513daadd SS |
404 | /* |
405 | * We reset the drive so we need to issue a SETFEATURES. | |
406 | * Do it _after_ do_special() restored device parameters. | |
407 | */ | |
408 | if (drive->current_speed == 0xff) | |
409 | ide_config_drive_speed(drive, drive->desired_speed); | |
410 | ||
7267c337 | 411 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
412 | return execute_drive_cmd(drive, rq); |
413 | else if (blk_pm_request(rq)) { | |
c00895ab | 414 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
415 | #ifdef DEBUG_PM |
416 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 417 | drive->name, pm->pm_step); |
1da177e4 LT |
418 | #endif |
419 | startstop = ide_start_power_step(drive, rq); | |
420 | if (startstop == ide_stopped && | |
0d346ba0 | 421 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 422 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 423 | return startstop; |
79e36a9f EO |
424 | } else if (!rq->rq_disk && blk_special_request(rq)) |
425 | /* | |
426 | * TODO: Once all ULDs have been modified to | |
427 | * check for specific op codes rather than | |
428 | * blindly accepting any special request, the | |
429 | * check for ->rq_disk above may be replaced | |
430 | * by a more suitable mechanism or even | |
431 | * dropped entirely. | |
432 | */ | |
433 | return ide_special_rq(drive, rq); | |
1da177e4 | 434 | |
7f3c868b | 435 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
436 | |
437 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
438 | } |
439 | return do_special(drive); | |
440 | kill_rq: | |
441 | ide_kill_rq(drive, rq); | |
442 | return ide_stopped; | |
443 | } | |
444 | ||
445 | /** | |
446 | * ide_stall_queue - pause an IDE device | |
447 | * @drive: drive to stall | |
448 | * @timeout: time to stall for (jiffies) | |
449 | * | |
450 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 451 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
452 | */ |
453 | ||
454 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
455 | { | |
456 | if (timeout > WAIT_WORSTCASE) | |
457 | timeout = WAIT_WORSTCASE; | |
458 | drive->sleep = timeout + jiffies; | |
97100fc8 | 459 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 460 | } |
1da177e4 LT |
461 | EXPORT_SYMBOL(ide_stall_queue); |
462 | ||
5b31f855 BZ |
463 | static inline int ide_lock_port(ide_hwif_t *hwif) |
464 | { | |
465 | if (hwif->busy) | |
466 | return 1; | |
467 | ||
468 | hwif->busy = 1; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
474 | { | |
475 | hwif->busy = 0; | |
476 | } | |
477 | ||
478 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
479 | { | |
480 | int rc = 0; | |
481 | ||
482 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
483 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
484 | if (rc == 0) { | |
e354c1d8 BZ |
485 | if (host->get_lock) |
486 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
487 | } |
488 | } | |
489 | return rc; | |
490 | } | |
491 | ||
492 | static inline void ide_unlock_host(struct ide_host *host) | |
493 | { | |
494 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
495 | if (host->release_lock) |
496 | host->release_lock(); | |
5b31f855 BZ |
497 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
498 | } | |
499 | } | |
500 | ||
1da177e4 | 501 | /* |
b65fac32 | 502 | * Issue a new request to a device. |
1da177e4 | 503 | */ |
295f0004 | 504 | void do_ide_request(struct request_queue *q) |
1da177e4 | 505 | { |
201bffa4 BZ |
506 | ide_drive_t *drive = q->queuedata; |
507 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 508 | struct ide_host *host = hwif->host; |
5b31f855 | 509 | struct request *rq = NULL; |
1da177e4 LT |
510 | ide_startstop_t startstop; |
511 | ||
201bffa4 BZ |
512 | /* |
513 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
514 | * though that is 3 requests, it must be seen as a single transaction. | |
515 | * we must not preempt this drive until that is complete | |
516 | */ | |
517 | if (blk_queue_flushing(q)) | |
1da177e4 | 518 | /* |
201bffa4 BZ |
519 | * small race where queue could get replugged during |
520 | * the 3-request flush cycle, just yank the plug since | |
521 | * we want it to finish asap | |
1da177e4 | 522 | */ |
201bffa4 | 523 | blk_remove_plug(q); |
1da177e4 | 524 | |
201bffa4 | 525 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
526 | |
527 | if (ide_lock_host(host, hwif)) | |
528 | goto plug_device_2; | |
529 | ||
b65fac32 | 530 | spin_lock_irq(&hwif->lock); |
295f0004 | 531 | |
5b31f855 | 532 | if (!ide_lock_port(hwif)) { |
42cf2611 | 533 | ide_hwif_t *prev_port; |
201bffa4 | 534 | repeat: |
bd53cbcc | 535 | prev_port = hwif->host->cur_port; |
b65fac32 | 536 | hwif->rq = NULL; |
2fb21150 | 537 | |
201bffa4 BZ |
538 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
539 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 540 | ide_unlock_port(hwif); |
201bffa4 BZ |
541 | goto plug_device; |
542 | } | |
543 | } | |
295f0004 | 544 | |
bd53cbcc BZ |
545 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
546 | hwif != prev_port) { | |
7299a391 | 547 | /* |
42cf2611 | 548 | * set nIEN for previous port, drives in the |
7299a391 BZ |
549 | * quirk_list may not like intr setups/cleanups |
550 | */ | |
b65fac32 | 551 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 552 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
553 | |
554 | hwif->host->cur_port = hwif; | |
1da177e4 | 555 | } |
b65fac32 | 556 | hwif->cur_dev = drive; |
4abdc6ee | 557 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 558 | |
b65fac32 | 559 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 560 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
561 | /* |
562 | * we know that the queue isn't empty, but this can happen | |
563 | * if the q->prep_rq_fn() decides to kill a request | |
564 | */ | |
565 | rq = elv_next_request(drive->queue); | |
201bffa4 | 566 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 567 | spin_lock_irq(&hwif->lock); |
201bffa4 | 568 | |
1da177e4 | 569 | if (!rq) { |
5b31f855 | 570 | ide_unlock_port(hwif); |
201bffa4 | 571 | goto out; |
1da177e4 LT |
572 | } |
573 | ||
574 | /* | |
575 | * Sanity: don't accept a request that isn't a PM request | |
576 | * if we are currently power managed. This is very important as | |
577 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
578 | * above to return us whatever is in the queue. Since we call | |
579 | * ide_do_request() ourselves, we end up taking requests while | |
580 | * the queue is blocked... | |
581 | * | |
582 | * We let requests forced at head of queue with ide-preempt | |
583 | * though. I hope that doesn't happen too much, hopefully not | |
584 | * unless the subdriver triggers such a thing in its own PM | |
585 | * state machine. | |
586 | */ | |
97100fc8 BZ |
587 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
588 | blk_pm_request(rq) == 0 && | |
589 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 590 | /* there should be no pending command at this point */ |
5b31f855 | 591 | ide_unlock_port(hwif); |
295f0004 | 592 | goto plug_device; |
1da177e4 LT |
593 | } |
594 | ||
b65fac32 | 595 | hwif->rq = rq; |
1da177e4 | 596 | |
b65fac32 | 597 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 598 | startstop = start_request(drive, rq); |
b65fac32 | 599 | spin_lock_irq(&hwif->lock); |
295f0004 | 600 | |
201bffa4 BZ |
601 | if (startstop == ide_stopped) |
602 | goto repeat; | |
603 | } else | |
604 | goto plug_device; | |
605 | out: | |
b65fac32 | 606 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
607 | if (rq == NULL) |
608 | ide_unlock_host(host); | |
201bffa4 | 609 | spin_lock_irq(q->queue_lock); |
295f0004 | 610 | return; |
1da177e4 | 611 | |
295f0004 | 612 | plug_device: |
b65fac32 | 613 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
614 | ide_unlock_host(host); |
615 | plug_device_2: | |
201bffa4 BZ |
616 | spin_lock_irq(q->queue_lock); |
617 | ||
618 | if (!elv_queue_empty(q)) | |
619 | blk_plug_device(q); | |
1da177e4 LT |
620 | } |
621 | ||
201bffa4 BZ |
622 | static void ide_plug_device(ide_drive_t *drive) |
623 | { | |
624 | struct request_queue *q = drive->queue; | |
625 | unsigned long flags; | |
626 | ||
627 | spin_lock_irqsave(q->queue_lock, flags); | |
628 | if (!elv_queue_empty(q)) | |
629 | blk_plug_device(q); | |
630 | spin_unlock_irqrestore(q->queue_lock, flags); | |
631 | } | |
632 | ||
b6a45a0b BZ |
633 | static int drive_is_ready(ide_drive_t *drive) |
634 | { | |
635 | ide_hwif_t *hwif = drive->hwif; | |
636 | u8 stat = 0; | |
637 | ||
638 | if (drive->waiting_for_dma) | |
639 | return hwif->dma_ops->dma_test_irq(drive); | |
640 | ||
641 | if (hwif->io_ports.ctl_addr && | |
642 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
643 | stat = hwif->tp_ops->read_altstatus(hwif); | |
644 | else | |
645 | /* Note: this may clear a pending IRQ!! */ | |
646 | stat = hwif->tp_ops->read_status(hwif); | |
647 | ||
648 | if (stat & ATA_BUSY) | |
649 | /* drive busy: definitely not interrupting */ | |
650 | return 0; | |
651 | ||
652 | /* drive ready: *might* be interrupting */ | |
653 | return 1; | |
654 | } | |
655 | ||
1da177e4 LT |
656 | /** |
657 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 658 | * @data: timer callback magic (hwif) |
1da177e4 LT |
659 | * |
660 | * An IDE command has timed out before the expected drive return | |
661 | * occurred. At this point we attempt to clean up the current | |
662 | * mess. If the current handler includes an expiry handler then | |
663 | * we invoke the expiry handler, and providing it is happy the | |
664 | * work is done. If that fails we apply generic recovery rules | |
665 | * invoking the handler and checking the drive DMA status. We | |
666 | * have an excessively incestuous relationship with the DMA | |
667 | * logic that wants cleaning up. | |
668 | */ | |
669 | ||
670 | void ide_timer_expiry (unsigned long data) | |
671 | { | |
b65fac32 | 672 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 673 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 674 | ide_handler_t *handler; |
1da177e4 | 675 | unsigned long flags; |
e0c6dcd8 | 676 | int wait = -1; |
201bffa4 | 677 | int plug_device = 0; |
1da177e4 | 678 | |
b65fac32 BZ |
679 | spin_lock_irqsave(&hwif->lock, flags); |
680 | ||
681 | handler = hwif->handler; | |
1da177e4 | 682 | |
b65fac32 | 683 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
684 | /* |
685 | * Either a marginal timeout occurred | |
686 | * (got the interrupt just as timer expired), | |
687 | * or we were "sleeping" to give other devices a chance. | |
688 | * Either way, we don't really want to complain about anything. | |
689 | */ | |
1da177e4 | 690 | } else { |
c38714ed BZ |
691 | ide_expiry_t *expiry = hwif->expiry; |
692 | ide_startstop_t startstop = ide_stopped; | |
693 | ||
b65fac32 | 694 | drive = hwif->cur_dev; |
c38714ed BZ |
695 | |
696 | if (expiry) { | |
697 | wait = expiry(drive); | |
698 | if (wait > 0) { /* continue */ | |
699 | /* reset timer */ | |
700 | hwif->timer.expires = jiffies + wait; | |
701 | hwif->req_gen_timer = hwif->req_gen; | |
702 | add_timer(&hwif->timer); | |
703 | spin_unlock_irqrestore(&hwif->lock, flags); | |
704 | return; | |
295f0004 | 705 | } |
1da177e4 | 706 | } |
c38714ed BZ |
707 | hwif->handler = NULL; |
708 | /* | |
709 | * We need to simulate a real interrupt when invoking | |
710 | * the handler() function, which means we need to | |
711 | * globally mask the specific IRQ: | |
712 | */ | |
713 | spin_unlock(&hwif->lock); | |
714 | /* disable_irq_nosync ?? */ | |
715 | disable_irq(hwif->irq); | |
716 | /* local CPU only, as if we were handling an interrupt */ | |
717 | local_irq_disable(); | |
718 | if (hwif->polling) { | |
719 | startstop = handler(drive); | |
720 | } else if (drive_is_ready(drive)) { | |
721 | if (drive->waiting_for_dma) | |
722 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
723 | if (hwif->ack_intr) |
724 | hwif->ack_intr(hwif); | |
c38714ed BZ |
725 | printk(KERN_WARNING "%s: lost interrupt\n", |
726 | drive->name); | |
727 | startstop = handler(drive); | |
728 | } else { | |
729 | if (drive->waiting_for_dma) | |
730 | startstop = ide_dma_timeout_retry(drive, wait); | |
731 | else | |
732 | startstop = ide_error(drive, "irq timeout", | |
733 | hwif->tp_ops->read_status(hwif)); | |
734 | } | |
735 | spin_lock_irq(&hwif->lock); | |
736 | enable_irq(hwif->irq); | |
737 | if (startstop == ide_stopped) { | |
738 | ide_unlock_port(hwif); | |
739 | plug_device = 1; | |
740 | } | |
1da177e4 | 741 | } |
b65fac32 | 742 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 743 | |
5b31f855 BZ |
744 | if (plug_device) { |
745 | ide_unlock_host(hwif->host); | |
201bffa4 | 746 | ide_plug_device(drive); |
5b31f855 | 747 | } |
1da177e4 LT |
748 | } |
749 | ||
750 | /** | |
751 | * unexpected_intr - handle an unexpected IDE interrupt | |
752 | * @irq: interrupt line | |
bd53cbcc | 753 | * @hwif: port being processed |
1da177e4 LT |
754 | * |
755 | * There's nothing really useful we can do with an unexpected interrupt, | |
756 | * other than reading the status register (to clear it), and logging it. | |
757 | * There should be no way that an irq can happen before we're ready for it, | |
758 | * so we needn't worry much about losing an "important" interrupt here. | |
759 | * | |
760 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
761 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
762 | * looks "good", we just ignore the interrupt completely. | |
763 | * | |
764 | * This routine assumes __cli() is in effect when called. | |
765 | * | |
766 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
767 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
768 | * we could screw up by interfering with a new request being set up for | |
769 | * irq15. | |
770 | * | |
771 | * In reality, this is a non-issue. The new command is not sent unless | |
772 | * the drive is ready to accept one, in which case we know the drive is | |
773 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
774 | * before completing the issuance of any new drive command, so we will not | |
775 | * be accidentally invoked as a result of any valid command completion | |
776 | * interrupt. | |
1da177e4 | 777 | */ |
bd53cbcc BZ |
778 | |
779 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 780 | { |
ae86afae BZ |
781 | u8 stat = hwif->tp_ops->read_status(hwif); |
782 | ||
783 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
784 | /* Try to not flood the console with msgs */ | |
785 | static unsigned long last_msgtime, count; | |
786 | ++count; | |
787 | ||
788 | if (time_after(jiffies, last_msgtime + HZ)) { | |
789 | last_msgtime = jiffies; | |
790 | printk(KERN_ERR "%s: unexpected interrupt, " | |
791 | "status=0x%02x, count=%ld\n", | |
792 | hwif->name, stat, count); | |
1da177e4 | 793 | } |
ae86afae | 794 | } |
1da177e4 LT |
795 | } |
796 | ||
797 | /** | |
798 | * ide_intr - default IDE interrupt handler | |
799 | * @irq: interrupt number | |
ae86afae | 800 | * @dev_id: hwif |
1da177e4 LT |
801 | * @regs: unused weirdness from the kernel irq layer |
802 | * | |
803 | * This is the default IRQ handler for the IDE layer. You should | |
804 | * not need to override it. If you do be aware it is subtle in | |
805 | * places | |
806 | * | |
bd53cbcc | 807 | * hwif is the interface in the group currently performing |
b65fac32 | 808 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
809 | * the IRQ handler to call. As we issue a command the handlers |
810 | * step through multiple states, reassigning the handler to the | |
811 | * next step in the process. Unlike a smart SCSI controller IDE | |
812 | * expects the main processor to sequence the various transfer | |
813 | * stages. We also manage a poll timer to catch up with most | |
814 | * timeout situations. There are still a few where the handlers | |
815 | * don't ever decide to give up. | |
816 | * | |
817 | * The handler eventually returns ide_stopped to indicate the | |
818 | * request completed. At this point we issue the next request | |
b65fac32 | 819 | * on the port and the process begins again. |
1da177e4 | 820 | */ |
b65fac32 | 821 | |
7d12e780 | 822 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 823 | { |
ae86afae | 824 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 825 | struct ide_host *host = hwif->host; |
201bffa4 | 826 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 827 | ide_handler_t *handler; |
ae86afae | 828 | unsigned long flags; |
1da177e4 | 829 | ide_startstop_t startstop; |
3e0e29f7 | 830 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 831 | int plug_device = 0; |
1da177e4 | 832 | |
255115fb BZ |
833 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
834 | if (hwif != host->cur_port) | |
ae86afae BZ |
835 | goto out_early; |
836 | } | |
bd53cbcc | 837 | |
b65fac32 | 838 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 839 | |
d15a613b | 840 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 841 | goto out; |
1da177e4 | 842 | |
b65fac32 BZ |
843 | handler = hwif->handler; |
844 | ||
845 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
846 | /* |
847 | * Not expecting an interrupt from this drive. | |
848 | * That means this could be: | |
849 | * (1) an interrupt from another PCI device | |
850 | * sharing the same PCI INT# as us. | |
851 | * or (2) a drive just entered sleep or standby mode, | |
852 | * and is interrupting to let us know. | |
853 | * or (3) a spurious interrupt of unknown origin. | |
854 | * | |
855 | * For PCI, we cannot tell the difference, | |
856 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 857 | */ |
255115fb | 858 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
859 | /* |
860 | * Probably not a shared PCI interrupt, | |
861 | * so we can safely try to do something about it: | |
862 | */ | |
bd53cbcc | 863 | unexpected_intr(irq, hwif); |
1da177e4 LT |
864 | } else { |
865 | /* | |
866 | * Whack the status register, just in case | |
867 | * we have a leftover pending IRQ. | |
868 | */ | |
374e042c | 869 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 870 | } |
3e0e29f7 | 871 | goto out; |
1da177e4 | 872 | } |
3e0e29f7 | 873 | |
b65fac32 | 874 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
875 | |
876 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
877 | /* |
878 | * This happens regularly when we share a PCI IRQ with | |
879 | * another device. Unfortunately, it can also happen | |
880 | * with some buggy drives that trigger the IRQ before | |
881 | * their status register is up to date. Hopefully we have | |
882 | * enough advance overhead that the latter isn't a problem. | |
883 | */ | |
3e0e29f7 BZ |
884 | goto out; |
885 | ||
b65fac32 BZ |
886 | hwif->handler = NULL; |
887 | hwif->req_gen++; | |
888 | del_timer(&hwif->timer); | |
889 | spin_unlock(&hwif->lock); | |
1da177e4 | 890 | |
bfa7d8e5 BZ |
891 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
892 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 893 | |
97100fc8 | 894 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 895 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 896 | |
1da177e4 LT |
897 | /* service this interrupt, may set handler for next interrupt */ |
898 | startstop = handler(drive); | |
1da177e4 | 899 | |
b65fac32 | 900 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
901 | /* |
902 | * Note that handler() may have set things up for another | |
903 | * interrupt to occur soon, but it cannot happen until | |
904 | * we exit from this routine, because it will be the | |
905 | * same irq as is currently being serviced here, and Linux | |
906 | * won't allow another of the same (on any CPU) until we return. | |
907 | */ | |
1da177e4 | 908 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
909 | BUG_ON(hwif->handler); |
910 | ide_unlock_port(hwif); | |
911 | plug_device = 1; | |
1da177e4 | 912 | } |
3e0e29f7 BZ |
913 | irq_ret = IRQ_HANDLED; |
914 | out: | |
b65fac32 | 915 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 916 | out_early: |
5b31f855 BZ |
917 | if (plug_device) { |
918 | ide_unlock_host(hwif->host); | |
201bffa4 | 919 | ide_plug_device(drive); |
5b31f855 | 920 | } |
201bffa4 | 921 | |
3e0e29f7 | 922 | return irq_ret; |
1da177e4 | 923 | } |
849d7130 | 924 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 925 | |
9f87abe8 BZ |
926 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
927 | { | |
928 | ide_hwif_t *hwif = drive->hwif; | |
929 | u8 buf[4] = { 0 }; | |
930 | ||
931 | while (len > 0) { | |
932 | if (write) | |
374e042c | 933 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 934 | else |
374e042c | 935 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
936 | len -= 4; |
937 | } | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |