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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> | |
43 | #include <linux/completion.h> | |
44 | #include <linux/reboot.h> | |
45 | #include <linux/cdrom.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/device.h> | |
48 | #include <linux/kmod.h> | |
49 | #include <linux/scatterlist.h> | |
1977f032 | 50 | #include <linux/bitops.h> |
1da177e4 LT |
51 | |
52 | #include <asm/byteorder.h> | |
53 | #include <asm/irq.h> | |
54 | #include <asm/uaccess.h> | |
55 | #include <asm/io.h> | |
1da177e4 | 56 | |
a7ff7d41 | 57 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
bbc615b1 | 58 | int uptodate, unsigned int nr_bytes, int dequeue) |
1da177e4 LT |
59 | { |
60 | int ret = 1; | |
5e36bb6e KU |
61 | int error = 0; |
62 | ||
63 | if (uptodate <= 0) | |
64 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 65 | |
1da177e4 LT |
66 | /* |
67 | * if failfast is set on a request, override number of sectors and | |
68 | * complete the whole request right now | |
69 | */ | |
5e36bb6e | 70 | if (blk_noretry_request(rq) && error) |
41e9d344 | 71 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 72 | |
5e36bb6e | 73 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
74 | rq->errors = -EIO; |
75 | ||
76 | /* | |
77 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
78 | * if we DMA timeout more than 3 times, just stay in PIO | |
79 | */ | |
c3922048 BZ |
80 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
81 | drive->retry_pio <= 3) { | |
82 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 83 | ide_dma_on(drive); |
1da177e4 LT |
84 | } |
85 | ||
3c8a2cce | 86 | if (!blk_end_request(rq, error, nr_bytes)) |
1da177e4 | 87 | ret = 0; |
a72b2147 BZ |
88 | |
89 | if (ret == 0 && dequeue) | |
b65fac32 | 90 | drive->hwif->rq = NULL; |
8672d571 | 91 | |
1da177e4 LT |
92 | return ret; |
93 | } | |
1da177e4 LT |
94 | |
95 | /** | |
96 | * ide_end_request - complete an IDE I/O | |
97 | * @drive: IDE device for the I/O | |
98 | * @uptodate: | |
99 | * @nr_sectors: number of sectors completed | |
100 | * | |
101 | * This is our end_request wrapper function. We complete the I/O | |
102 | * update random number input and dequeue the request, which if | |
103 | * it was tagged may be out of order. | |
104 | */ | |
105 | ||
106 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
107 | { | |
41e9d344 | 108 | unsigned int nr_bytes = nr_sectors << 9; |
b65fac32 | 109 | struct request *rq = drive->hwif->rq; |
1da177e4 | 110 | |
41e9d344 JA |
111 | if (!nr_bytes) { |
112 | if (blk_pc_request(rq)) | |
113 | nr_bytes = rq->data_len; | |
114 | else | |
115 | nr_bytes = rq->hard_cur_sectors << 9; | |
116 | } | |
1da177e4 | 117 | |
a72b2147 | 118 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
119 | } |
120 | EXPORT_SYMBOL(ide_end_request); | |
121 | ||
dbe217af AC |
122 | /** |
123 | * ide_end_dequeued_request - complete an IDE I/O | |
124 | * @drive: IDE device for the I/O | |
125 | * @uptodate: | |
126 | * @nr_sectors: number of sectors completed | |
127 | * | |
128 | * Complete an I/O that is no longer on the request queue. This | |
129 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
130 | * We must still finish the old request but we must not tamper with the | |
131 | * queue in the meantime. | |
132 | * | |
133 | * NOTE: This path does not handle barrier, but barrier is not supported | |
134 | * on ide-cd anyway. | |
135 | */ | |
136 | ||
137 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
138 | int uptodate, int nr_sectors) | |
139 | { | |
4aff5e23 | 140 | BUG_ON(!blk_rq_started(rq)); |
1d0bf587 | 141 | |
a72b2147 | 142 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af AC |
143 | } |
144 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
145 | ||
22aa4b32 | 146 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 147 | { |
22aa4b32 BZ |
148 | struct ide_taskfile *tf = &cmd->tf; |
149 | struct request *rq = cmd->rq; | |
e7fedc3c | 150 | u8 tf_cmd = tf->command; |
e120237c BZ |
151 | |
152 | tf->error = err; | |
153 | tf->status = stat; | |
154 | ||
22aa4b32 | 155 | drive->hwif->tp_ops->tf_read(drive, cmd); |
e120237c | 156 | |
e7fedc3c BZ |
157 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
158 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { | |
159 | if (tf->lbal != 0xc4) { | |
160 | printk(KERN_ERR "%s: head unload failed!\n", | |
161 | drive->name); | |
162 | ide_tf_dump(drive->name, tf); | |
163 | } else | |
164 | drive->dev_flags |= IDE_DFLAG_PARKED; | |
165 | } | |
166 | ||
a09485df | 167 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
22aa4b32 | 168 | memcpy(rq->special, cmd, sizeof(*cmd)); |
a09485df | 169 | |
22aa4b32 BZ |
170 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
171 | kfree(cmd); | |
e120237c BZ |
172 | } |
173 | ||
a09485df | 174 | void ide_complete_rq(ide_drive_t *drive, u8 err) |
1da177e4 | 175 | { |
b65fac32 BZ |
176 | ide_hwif_t *hwif = drive->hwif; |
177 | struct request *rq = hwif->rq; | |
1da177e4 | 178 | |
b65fac32 | 179 | hwif->rq = NULL; |
1d0bf587 | 180 | |
1da177e4 | 181 | rq->errors = err; |
1d0bf587 | 182 | |
3c8a2cce BZ |
183 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
184 | blk_rq_bytes(rq)))) | |
5e36bb6e | 185 | BUG(); |
1da177e4 | 186 | } |
a09485df | 187 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 188 | |
327fa1c2 | 189 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 190 | { |
3ee38302 BZ |
191 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
192 | u8 media = drive->media; | |
193 | ||
c152cc1a BZ |
194 | drive->failed_pc = NULL; |
195 | ||
3ee38302 | 196 | if ((media == ide_floppy && drv_req) || media == ide_tape) |
c152cc1a BZ |
197 | rq->errors = IDE_DRV_ERROR_GENERAL; |
198 | ||
3ee38302 BZ |
199 | if ((media == ide_floppy || media == ide_tape) && drv_req) |
200 | ide_complete_rq(drive, 0); | |
201 | else | |
1da177e4 LT |
202 | ide_end_request(drive, 0, 0); |
203 | } | |
204 | ||
57d7366b | 205 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 206 | { |
57d7366b BZ |
207 | tf->nsect = drive->sect; |
208 | tf->lbal = drive->sect; | |
209 | tf->lbam = drive->cyl; | |
210 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 211 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 212 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
213 | } |
214 | ||
57d7366b | 215 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 216 | { |
57d7366b | 217 | tf->nsect = drive->sect; |
aaaade3f | 218 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
219 | } |
220 | ||
57d7366b | 221 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 222 | { |
57d7366b | 223 | tf->nsect = drive->mult_req; |
aaaade3f | 224 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
225 | } |
226 | ||
227 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
228 | { | |
229 | special_t *s = &drive->special; | |
22aa4b32 | 230 | struct ide_cmd cmd; |
1da177e4 | 231 | |
22aa4b32 | 232 | memset(&cmd, 0, sizeof(cmd)); |
0dfb991c | 233 | cmd.protocol = ATA_PROT_NODATA; |
1da177e4 LT |
234 | |
235 | if (s->b.set_geometry) { | |
236 | s->b.set_geometry = 0; | |
22aa4b32 | 237 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
1da177e4 LT |
238 | } else if (s->b.recalibrate) { |
239 | s->b.recalibrate = 0; | |
22aa4b32 | 240 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
1da177e4 LT |
241 | } else if (s->b.set_multmode) { |
242 | s->b.set_multmode = 0; | |
22aa4b32 | 243 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
1da177e4 LT |
244 | } else if (s->all) { |
245 | int special = s->all; | |
246 | s->all = 0; | |
247 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
248 | return ide_stopped; | |
249 | } | |
250 | ||
22aa4b32 BZ |
251 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
252 | IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 253 | |
22aa4b32 | 254 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
255 | |
256 | return ide_started; | |
257 | } | |
258 | ||
259 | /** | |
260 | * do_special - issue some special commands | |
261 | * @drive: drive the command is for | |
262 | * | |
aaaade3f BZ |
263 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
264 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
265 | * | |
266 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
267 | */ |
268 | ||
269 | static ide_startstop_t do_special (ide_drive_t *drive) | |
270 | { | |
271 | special_t *s = &drive->special; | |
272 | ||
273 | #ifdef DEBUG | |
274 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
275 | #endif | |
6982daf7 BZ |
276 | if (drive->media == ide_disk) |
277 | return ide_disk_special(drive); | |
1da177e4 | 278 | |
6982daf7 BZ |
279 | s->all = 0; |
280 | drive->mult_req = 0; | |
281 | return ide_stopped; | |
1da177e4 LT |
282 | } |
283 | ||
284 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
285 | { | |
286 | ide_hwif_t *hwif = drive->hwif; | |
b6308ee0 | 287 | struct ide_cmd *cmd = &hwif->cmd; |
1da177e4 LT |
288 | struct scatterlist *sg = hwif->sg_table; |
289 | ||
9e772d01 | 290 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 | 291 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
b6308ee0 | 292 | cmd->sg_nents = 1; |
9e772d01 BP |
293 | } else if (!rq->bio) { |
294 | sg_init_one(sg, rq->data, rq->data_len); | |
b6308ee0 BZ |
295 | cmd->sg_nents = 1; |
296 | } else | |
297 | cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 | 298 | } |
1da177e4 LT |
299 | EXPORT_SYMBOL_GPL(ide_map_sg); |
300 | ||
b6308ee0 | 301 | void ide_init_sg_cmd(struct ide_cmd *cmd, int nsect) |
1da177e4 | 302 | { |
b6308ee0 BZ |
303 | cmd->nsect = cmd->nleft = nsect; |
304 | cmd->cursg_ofs = 0; | |
305 | cmd->cursg = NULL; | |
1da177e4 | 306 | } |
1da177e4 LT |
307 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
308 | ||
309 | /** | |
310 | * execute_drive_command - issue special drive command | |
338cec32 | 311 | * @drive: the drive to issue the command on |
1da177e4 LT |
312 | * @rq: the request structure holding the command |
313 | * | |
314 | * execute_drive_cmd() issues a special drive command, usually | |
315 | * initiated by ioctl() from the external hdparm program. The | |
316 | * command can be a drive command, drive task or taskfile | |
317 | * operation. Weirdly you can call it with NULL to wait for | |
318 | * all commands to finish. Don't do this as that is due to change | |
319 | */ | |
320 | ||
321 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
322 | struct request *rq) | |
323 | { | |
22aa4b32 | 324 | struct ide_cmd *cmd = rq->special; |
1da177e4 | 325 | |
22aa4b32 | 326 | if (cmd) { |
0dfb991c | 327 | if (cmd->protocol == ATA_PROT_PIO) { |
b6308ee0 | 328 | ide_init_sg_cmd(cmd, rq->nr_sectors); |
1da177e4 | 329 | ide_map_sg(drive, rq); |
1da177e4 | 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: | |
1713788f | 360 | BUG(); |
79e36a9f EO |
361 | } |
362 | } | |
363 | ||
1da177e4 LT |
364 | /** |
365 | * start_request - start of I/O and command issuing for IDE | |
366 | * | |
367 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 368 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
369 | * |
370 | * FIXME: this function needs a rename | |
371 | */ | |
372 | ||
373 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
374 | { | |
375 | ide_startstop_t startstop; | |
1da177e4 | 376 | |
4aff5e23 | 377 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
378 | |
379 | #ifdef DEBUG | |
380 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 381 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
382 | #endif |
383 | ||
384 | /* bail early if we've exceeded max_failures */ | |
385 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 386 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
387 | goto kill_rq; |
388 | } | |
389 | ||
ad3cadda JA |
390 | if (blk_pm_request(rq)) |
391 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
392 | |
393 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
394 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
395 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
396 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
397 | return startstop; | |
398 | } | |
399 | if (!drive->special.all) { | |
7f3c868b | 400 | struct ide_driver *drv; |
1da177e4 | 401 | |
513daadd SS |
402 | /* |
403 | * We reset the drive so we need to issue a SETFEATURES. | |
404 | * Do it _after_ do_special() restored device parameters. | |
405 | */ | |
406 | if (drive->current_speed == 0xff) | |
407 | ide_config_drive_speed(drive, drive->desired_speed); | |
408 | ||
7267c337 | 409 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
410 | return execute_drive_cmd(drive, rq); |
411 | else if (blk_pm_request(rq)) { | |
c00895ab | 412 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
413 | #ifdef DEBUG_PM |
414 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 415 | drive->name, pm->pm_step); |
1da177e4 LT |
416 | #endif |
417 | startstop = ide_start_power_step(drive, rq); | |
418 | if (startstop == ide_stopped && | |
0d346ba0 | 419 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 420 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 421 | return startstop; |
79e36a9f EO |
422 | } else if (!rq->rq_disk && blk_special_request(rq)) |
423 | /* | |
424 | * TODO: Once all ULDs have been modified to | |
425 | * check for specific op codes rather than | |
426 | * blindly accepting any special request, the | |
427 | * check for ->rq_disk above may be replaced | |
428 | * by a more suitable mechanism or even | |
429 | * dropped entirely. | |
430 | */ | |
431 | return ide_special_rq(drive, rq); | |
1da177e4 | 432 | |
7f3c868b | 433 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
434 | |
435 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
436 | } |
437 | return do_special(drive); | |
438 | kill_rq: | |
439 | ide_kill_rq(drive, rq); | |
440 | return ide_stopped; | |
441 | } | |
442 | ||
443 | /** | |
444 | * ide_stall_queue - pause an IDE device | |
445 | * @drive: drive to stall | |
446 | * @timeout: time to stall for (jiffies) | |
447 | * | |
448 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 449 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
450 | */ |
451 | ||
452 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
453 | { | |
454 | if (timeout > WAIT_WORSTCASE) | |
455 | timeout = WAIT_WORSTCASE; | |
456 | drive->sleep = timeout + jiffies; | |
97100fc8 | 457 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 458 | } |
1da177e4 LT |
459 | EXPORT_SYMBOL(ide_stall_queue); |
460 | ||
5b31f855 BZ |
461 | static inline int ide_lock_port(ide_hwif_t *hwif) |
462 | { | |
463 | if (hwif->busy) | |
464 | return 1; | |
465 | ||
466 | hwif->busy = 1; | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
472 | { | |
473 | hwif->busy = 0; | |
474 | } | |
475 | ||
476 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
477 | { | |
478 | int rc = 0; | |
479 | ||
480 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
481 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
482 | if (rc == 0) { | |
e354c1d8 BZ |
483 | if (host->get_lock) |
484 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
485 | } |
486 | } | |
487 | return rc; | |
488 | } | |
489 | ||
490 | static inline void ide_unlock_host(struct ide_host *host) | |
491 | { | |
492 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
493 | if (host->release_lock) |
494 | host->release_lock(); | |
5b31f855 BZ |
495 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
496 | } | |
497 | } | |
498 | ||
1da177e4 | 499 | /* |
b65fac32 | 500 | * Issue a new request to a device. |
1da177e4 | 501 | */ |
295f0004 | 502 | void do_ide_request(struct request_queue *q) |
1da177e4 | 503 | { |
201bffa4 BZ |
504 | ide_drive_t *drive = q->queuedata; |
505 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 506 | struct ide_host *host = hwif->host; |
5b31f855 | 507 | struct request *rq = NULL; |
1da177e4 LT |
508 | ide_startstop_t startstop; |
509 | ||
201bffa4 BZ |
510 | /* |
511 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
512 | * though that is 3 requests, it must be seen as a single transaction. | |
513 | * we must not preempt this drive until that is complete | |
514 | */ | |
515 | if (blk_queue_flushing(q)) | |
1da177e4 | 516 | /* |
201bffa4 BZ |
517 | * small race where queue could get replugged during |
518 | * the 3-request flush cycle, just yank the plug since | |
519 | * we want it to finish asap | |
1da177e4 | 520 | */ |
201bffa4 | 521 | blk_remove_plug(q); |
1da177e4 | 522 | |
201bffa4 | 523 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
524 | |
525 | if (ide_lock_host(host, hwif)) | |
526 | goto plug_device_2; | |
527 | ||
b65fac32 | 528 | spin_lock_irq(&hwif->lock); |
295f0004 | 529 | |
5b31f855 | 530 | if (!ide_lock_port(hwif)) { |
42cf2611 | 531 | ide_hwif_t *prev_port; |
201bffa4 | 532 | repeat: |
bd53cbcc | 533 | prev_port = hwif->host->cur_port; |
b65fac32 | 534 | hwif->rq = NULL; |
2fb21150 | 535 | |
201bffa4 BZ |
536 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
537 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 538 | ide_unlock_port(hwif); |
201bffa4 BZ |
539 | goto plug_device; |
540 | } | |
541 | } | |
295f0004 | 542 | |
bd53cbcc BZ |
543 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
544 | hwif != prev_port) { | |
7299a391 | 545 | /* |
42cf2611 | 546 | * set nIEN for previous port, drives in the |
7299a391 BZ |
547 | * quirk_list may not like intr setups/cleanups |
548 | */ | |
b65fac32 | 549 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 550 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
551 | |
552 | hwif->host->cur_port = hwif; | |
1da177e4 | 553 | } |
b65fac32 | 554 | hwif->cur_dev = drive; |
4abdc6ee | 555 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 556 | |
b65fac32 | 557 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 558 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
559 | /* |
560 | * we know that the queue isn't empty, but this can happen | |
561 | * if the q->prep_rq_fn() decides to kill a request | |
562 | */ | |
563 | rq = elv_next_request(drive->queue); | |
201bffa4 | 564 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 565 | spin_lock_irq(&hwif->lock); |
201bffa4 | 566 | |
1da177e4 | 567 | if (!rq) { |
5b31f855 | 568 | ide_unlock_port(hwif); |
201bffa4 | 569 | goto out; |
1da177e4 LT |
570 | } |
571 | ||
572 | /* | |
573 | * Sanity: don't accept a request that isn't a PM request | |
574 | * if we are currently power managed. This is very important as | |
575 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
576 | * above to return us whatever is in the queue. Since we call | |
577 | * ide_do_request() ourselves, we end up taking requests while | |
578 | * the queue is blocked... | |
579 | * | |
580 | * We let requests forced at head of queue with ide-preempt | |
581 | * though. I hope that doesn't happen too much, hopefully not | |
582 | * unless the subdriver triggers such a thing in its own PM | |
583 | * state machine. | |
584 | */ | |
97100fc8 BZ |
585 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
586 | blk_pm_request(rq) == 0 && | |
587 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 588 | /* there should be no pending command at this point */ |
5b31f855 | 589 | ide_unlock_port(hwif); |
295f0004 | 590 | goto plug_device; |
1da177e4 LT |
591 | } |
592 | ||
b65fac32 | 593 | hwif->rq = rq; |
1da177e4 | 594 | |
b65fac32 | 595 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 596 | startstop = start_request(drive, rq); |
b65fac32 | 597 | spin_lock_irq(&hwif->lock); |
295f0004 | 598 | |
201bffa4 BZ |
599 | if (startstop == ide_stopped) |
600 | goto repeat; | |
601 | } else | |
602 | goto plug_device; | |
603 | out: | |
b65fac32 | 604 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
605 | if (rq == NULL) |
606 | ide_unlock_host(host); | |
201bffa4 | 607 | spin_lock_irq(q->queue_lock); |
295f0004 | 608 | return; |
1da177e4 | 609 | |
295f0004 | 610 | plug_device: |
b65fac32 | 611 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
612 | ide_unlock_host(host); |
613 | plug_device_2: | |
201bffa4 BZ |
614 | spin_lock_irq(q->queue_lock); |
615 | ||
616 | if (!elv_queue_empty(q)) | |
617 | blk_plug_device(q); | |
1da177e4 LT |
618 | } |
619 | ||
201bffa4 BZ |
620 | static void ide_plug_device(ide_drive_t *drive) |
621 | { | |
622 | struct request_queue *q = drive->queue; | |
623 | unsigned long flags; | |
624 | ||
625 | spin_lock_irqsave(q->queue_lock, flags); | |
626 | if (!elv_queue_empty(q)) | |
627 | blk_plug_device(q); | |
628 | spin_unlock_irqrestore(q->queue_lock, flags); | |
629 | } | |
630 | ||
b6a45a0b BZ |
631 | static int drive_is_ready(ide_drive_t *drive) |
632 | { | |
633 | ide_hwif_t *hwif = drive->hwif; | |
634 | u8 stat = 0; | |
635 | ||
636 | if (drive->waiting_for_dma) | |
637 | return hwif->dma_ops->dma_test_irq(drive); | |
638 | ||
639 | if (hwif->io_ports.ctl_addr && | |
640 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
641 | stat = hwif->tp_ops->read_altstatus(hwif); | |
642 | else | |
643 | /* Note: this may clear a pending IRQ!! */ | |
644 | stat = hwif->tp_ops->read_status(hwif); | |
645 | ||
646 | if (stat & ATA_BUSY) | |
647 | /* drive busy: definitely not interrupting */ | |
648 | return 0; | |
649 | ||
650 | /* drive ready: *might* be interrupting */ | |
651 | return 1; | |
652 | } | |
653 | ||
1da177e4 LT |
654 | /** |
655 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 656 | * @data: timer callback magic (hwif) |
1da177e4 LT |
657 | * |
658 | * An IDE command has timed out before the expected drive return | |
659 | * occurred. At this point we attempt to clean up the current | |
660 | * mess. If the current handler includes an expiry handler then | |
661 | * we invoke the expiry handler, and providing it is happy the | |
662 | * work is done. If that fails we apply generic recovery rules | |
663 | * invoking the handler and checking the drive DMA status. We | |
664 | * have an excessively incestuous relationship with the DMA | |
665 | * logic that wants cleaning up. | |
666 | */ | |
667 | ||
668 | void ide_timer_expiry (unsigned long data) | |
669 | { | |
b65fac32 | 670 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 671 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 672 | ide_handler_t *handler; |
1da177e4 | 673 | unsigned long flags; |
e0c6dcd8 | 674 | int wait = -1; |
201bffa4 | 675 | int plug_device = 0; |
1da177e4 | 676 | |
b65fac32 BZ |
677 | spin_lock_irqsave(&hwif->lock, flags); |
678 | ||
679 | handler = hwif->handler; | |
1da177e4 | 680 | |
b65fac32 | 681 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
682 | /* |
683 | * Either a marginal timeout occurred | |
684 | * (got the interrupt just as timer expired), | |
685 | * or we were "sleeping" to give other devices a chance. | |
686 | * Either way, we don't really want to complain about anything. | |
687 | */ | |
1da177e4 | 688 | } else { |
c38714ed BZ |
689 | ide_expiry_t *expiry = hwif->expiry; |
690 | ide_startstop_t startstop = ide_stopped; | |
691 | ||
b65fac32 | 692 | drive = hwif->cur_dev; |
c38714ed BZ |
693 | |
694 | if (expiry) { | |
695 | wait = expiry(drive); | |
696 | if (wait > 0) { /* continue */ | |
697 | /* reset timer */ | |
698 | hwif->timer.expires = jiffies + wait; | |
699 | hwif->req_gen_timer = hwif->req_gen; | |
700 | add_timer(&hwif->timer); | |
701 | spin_unlock_irqrestore(&hwif->lock, flags); | |
702 | return; | |
295f0004 | 703 | } |
1da177e4 | 704 | } |
c38714ed BZ |
705 | hwif->handler = NULL; |
706 | /* | |
707 | * We need to simulate a real interrupt when invoking | |
708 | * the handler() function, which means we need to | |
709 | * globally mask the specific IRQ: | |
710 | */ | |
711 | spin_unlock(&hwif->lock); | |
712 | /* disable_irq_nosync ?? */ | |
713 | disable_irq(hwif->irq); | |
714 | /* local CPU only, as if we were handling an interrupt */ | |
715 | local_irq_disable(); | |
716 | if (hwif->polling) { | |
717 | startstop = handler(drive); | |
718 | } else if (drive_is_ready(drive)) { | |
719 | if (drive->waiting_for_dma) | |
720 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
721 | if (hwif->ack_intr) |
722 | hwif->ack_intr(hwif); | |
c38714ed BZ |
723 | printk(KERN_WARNING "%s: lost interrupt\n", |
724 | drive->name); | |
725 | startstop = handler(drive); | |
726 | } else { | |
727 | if (drive->waiting_for_dma) | |
728 | startstop = ide_dma_timeout_retry(drive, wait); | |
729 | else | |
730 | startstop = ide_error(drive, "irq timeout", | |
731 | hwif->tp_ops->read_status(hwif)); | |
732 | } | |
733 | spin_lock_irq(&hwif->lock); | |
734 | enable_irq(hwif->irq); | |
735 | if (startstop == ide_stopped) { | |
736 | ide_unlock_port(hwif); | |
737 | plug_device = 1; | |
738 | } | |
1da177e4 | 739 | } |
b65fac32 | 740 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 741 | |
5b31f855 BZ |
742 | if (plug_device) { |
743 | ide_unlock_host(hwif->host); | |
201bffa4 | 744 | ide_plug_device(drive); |
5b31f855 | 745 | } |
1da177e4 LT |
746 | } |
747 | ||
748 | /** | |
749 | * unexpected_intr - handle an unexpected IDE interrupt | |
750 | * @irq: interrupt line | |
bd53cbcc | 751 | * @hwif: port being processed |
1da177e4 LT |
752 | * |
753 | * There's nothing really useful we can do with an unexpected interrupt, | |
754 | * other than reading the status register (to clear it), and logging it. | |
755 | * There should be no way that an irq can happen before we're ready for it, | |
756 | * so we needn't worry much about losing an "important" interrupt here. | |
757 | * | |
758 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
759 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
760 | * looks "good", we just ignore the interrupt completely. | |
761 | * | |
762 | * This routine assumes __cli() is in effect when called. | |
763 | * | |
764 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
765 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
766 | * we could screw up by interfering with a new request being set up for | |
767 | * irq15. | |
768 | * | |
769 | * In reality, this is a non-issue. The new command is not sent unless | |
770 | * the drive is ready to accept one, in which case we know the drive is | |
771 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
772 | * before completing the issuance of any new drive command, so we will not | |
773 | * be accidentally invoked as a result of any valid command completion | |
774 | * interrupt. | |
1da177e4 | 775 | */ |
bd53cbcc BZ |
776 | |
777 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 778 | { |
ae86afae BZ |
779 | u8 stat = hwif->tp_ops->read_status(hwif); |
780 | ||
781 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
782 | /* Try to not flood the console with msgs */ | |
783 | static unsigned long last_msgtime, count; | |
784 | ++count; | |
785 | ||
786 | if (time_after(jiffies, last_msgtime + HZ)) { | |
787 | last_msgtime = jiffies; | |
788 | printk(KERN_ERR "%s: unexpected interrupt, " | |
789 | "status=0x%02x, count=%ld\n", | |
790 | hwif->name, stat, count); | |
1da177e4 | 791 | } |
ae86afae | 792 | } |
1da177e4 LT |
793 | } |
794 | ||
795 | /** | |
796 | * ide_intr - default IDE interrupt handler | |
797 | * @irq: interrupt number | |
ae86afae | 798 | * @dev_id: hwif |
1da177e4 LT |
799 | * @regs: unused weirdness from the kernel irq layer |
800 | * | |
801 | * This is the default IRQ handler for the IDE layer. You should | |
802 | * not need to override it. If you do be aware it is subtle in | |
803 | * places | |
804 | * | |
bd53cbcc | 805 | * hwif is the interface in the group currently performing |
b65fac32 | 806 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
807 | * the IRQ handler to call. As we issue a command the handlers |
808 | * step through multiple states, reassigning the handler to the | |
809 | * next step in the process. Unlike a smart SCSI controller IDE | |
810 | * expects the main processor to sequence the various transfer | |
811 | * stages. We also manage a poll timer to catch up with most | |
812 | * timeout situations. There are still a few where the handlers | |
813 | * don't ever decide to give up. | |
814 | * | |
815 | * The handler eventually returns ide_stopped to indicate the | |
816 | * request completed. At this point we issue the next request | |
b65fac32 | 817 | * on the port and the process begins again. |
1da177e4 | 818 | */ |
b65fac32 | 819 | |
7d12e780 | 820 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 821 | { |
ae86afae | 822 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 823 | struct ide_host *host = hwif->host; |
201bffa4 | 824 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 825 | ide_handler_t *handler; |
ae86afae | 826 | unsigned long flags; |
1da177e4 | 827 | ide_startstop_t startstop; |
3e0e29f7 | 828 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 829 | int plug_device = 0; |
1da177e4 | 830 | |
255115fb BZ |
831 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
832 | if (hwif != host->cur_port) | |
ae86afae BZ |
833 | goto out_early; |
834 | } | |
bd53cbcc | 835 | |
b65fac32 | 836 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 837 | |
d15a613b | 838 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 839 | goto out; |
1da177e4 | 840 | |
b65fac32 BZ |
841 | handler = hwif->handler; |
842 | ||
843 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
844 | /* |
845 | * Not expecting an interrupt from this drive. | |
846 | * That means this could be: | |
847 | * (1) an interrupt from another PCI device | |
848 | * sharing the same PCI INT# as us. | |
849 | * or (2) a drive just entered sleep or standby mode, | |
850 | * and is interrupting to let us know. | |
851 | * or (3) a spurious interrupt of unknown origin. | |
852 | * | |
853 | * For PCI, we cannot tell the difference, | |
854 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 855 | */ |
255115fb | 856 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
857 | /* |
858 | * Probably not a shared PCI interrupt, | |
859 | * so we can safely try to do something about it: | |
860 | */ | |
bd53cbcc | 861 | unexpected_intr(irq, hwif); |
1da177e4 LT |
862 | } else { |
863 | /* | |
864 | * Whack the status register, just in case | |
865 | * we have a leftover pending IRQ. | |
866 | */ | |
374e042c | 867 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 868 | } |
3e0e29f7 | 869 | goto out; |
1da177e4 | 870 | } |
3e0e29f7 | 871 | |
b65fac32 | 872 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
873 | |
874 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
875 | /* |
876 | * This happens regularly when we share a PCI IRQ with | |
877 | * another device. Unfortunately, it can also happen | |
878 | * with some buggy drives that trigger the IRQ before | |
879 | * their status register is up to date. Hopefully we have | |
880 | * enough advance overhead that the latter isn't a problem. | |
881 | */ | |
3e0e29f7 BZ |
882 | goto out; |
883 | ||
b65fac32 BZ |
884 | hwif->handler = NULL; |
885 | hwif->req_gen++; | |
886 | del_timer(&hwif->timer); | |
887 | spin_unlock(&hwif->lock); | |
1da177e4 | 888 | |
bfa7d8e5 BZ |
889 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
890 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 891 | |
97100fc8 | 892 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 893 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 894 | |
1da177e4 LT |
895 | /* service this interrupt, may set handler for next interrupt */ |
896 | startstop = handler(drive); | |
1da177e4 | 897 | |
b65fac32 | 898 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
899 | /* |
900 | * Note that handler() may have set things up for another | |
901 | * interrupt to occur soon, but it cannot happen until | |
902 | * we exit from this routine, because it will be the | |
903 | * same irq as is currently being serviced here, and Linux | |
904 | * won't allow another of the same (on any CPU) until we return. | |
905 | */ | |
1da177e4 | 906 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
907 | BUG_ON(hwif->handler); |
908 | ide_unlock_port(hwif); | |
909 | plug_device = 1; | |
1da177e4 | 910 | } |
3e0e29f7 BZ |
911 | irq_ret = IRQ_HANDLED; |
912 | out: | |
b65fac32 | 913 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 914 | out_early: |
5b31f855 BZ |
915 | if (plug_device) { |
916 | ide_unlock_host(hwif->host); | |
201bffa4 | 917 | ide_plug_device(drive); |
5b31f855 | 918 | } |
201bffa4 | 919 | |
3e0e29f7 | 920 | return irq_ret; |
1da177e4 | 921 | } |
849d7130 | 922 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 923 | |
9f87abe8 BZ |
924 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
925 | { | |
926 | ide_hwif_t *hwif = drive->hwif; | |
927 | u8 buf[4] = { 0 }; | |
928 | ||
929 | while (len > 0) { | |
930 | if (write) | |
374e042c | 931 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 932 | else |
374e042c | 933 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
934 | len -= 4; |
935 | } | |
936 | } | |
937 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |