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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 | |
37245aab | 57 | int ide_end_rq(ide_drive_t *drive, struct request *rq, int error, |
1caf236d | 58 | unsigned int nr_bytes) |
1da177e4 | 59 | { |
1da177e4 LT |
60 | /* |
61 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
62 | * if we DMA timeout more than 3 times, just stay in PIO | |
63 | */ | |
c3922048 BZ |
64 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
65 | drive->retry_pio <= 3) { | |
66 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 67 | ide_dma_on(drive); |
1da177e4 LT |
68 | } |
69 | ||
1caf236d | 70 | return blk_end_request(rq, error, nr_bytes); |
1da177e4 | 71 | } |
1caf236d | 72 | EXPORT_SYMBOL_GPL(ide_end_rq); |
1da177e4 LT |
73 | |
74 | /** | |
75 | * ide_end_request - complete an IDE I/O | |
76 | * @drive: IDE device for the I/O | |
77 | * @uptodate: | |
78 | * @nr_sectors: number of sectors completed | |
79 | * | |
80 | * This is our end_request wrapper function. We complete the I/O | |
81 | * update random number input and dequeue the request, which if | |
82 | * it was tagged may be out of order. | |
83 | */ | |
84 | ||
85 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
86 | { | |
41e9d344 | 87 | unsigned int nr_bytes = nr_sectors << 9; |
b65fac32 | 88 | struct request *rq = drive->hwif->rq; |
37245aab | 89 | int rc, error = 0; |
1da177e4 | 90 | |
41e9d344 JA |
91 | if (!nr_bytes) { |
92 | if (blk_pc_request(rq)) | |
93 | nr_bytes = rq->data_len; | |
94 | else | |
95 | nr_bytes = rq->hard_cur_sectors << 9; | |
96 | } | |
1da177e4 | 97 | |
37245aab BZ |
98 | /* |
99 | * if failfast is set on a request, override number of sectors | |
100 | * and complete the whole request right now | |
101 | */ | |
102 | if (blk_noretry_request(rq) && uptodate <= 0) | |
103 | nr_bytes = rq->hard_nr_sectors << 9; | |
104 | ||
37245aab BZ |
105 | if (uptodate <= 0) |
106 | error = uptodate ? uptodate : -EIO; | |
107 | ||
108 | rc = ide_end_rq(drive, rq, error, nr_bytes); | |
1caf236d BZ |
109 | if (rc == 0) |
110 | drive->hwif->rq = NULL; | |
1d0bf587 | 111 | |
1caf236d | 112 | return rc; |
dbe217af | 113 | } |
1caf236d | 114 | EXPORT_SYMBOL(ide_end_request); |
dbe217af | 115 | |
22aa4b32 | 116 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 117 | { |
22aa4b32 BZ |
118 | struct ide_taskfile *tf = &cmd->tf; |
119 | struct request *rq = cmd->rq; | |
e7fedc3c | 120 | u8 tf_cmd = tf->command; |
e120237c BZ |
121 | |
122 | tf->error = err; | |
123 | tf->status = stat; | |
124 | ||
22aa4b32 | 125 | drive->hwif->tp_ops->tf_read(drive, cmd); |
e120237c | 126 | |
e7fedc3c BZ |
127 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
128 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { | |
129 | if (tf->lbal != 0xc4) { | |
130 | printk(KERN_ERR "%s: head unload failed!\n", | |
131 | drive->name); | |
132 | ide_tf_dump(drive->name, tf); | |
133 | } else | |
134 | drive->dev_flags |= IDE_DFLAG_PARKED; | |
135 | } | |
136 | ||
a09485df | 137 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
22aa4b32 | 138 | memcpy(rq->special, cmd, sizeof(*cmd)); |
a09485df | 139 | |
22aa4b32 BZ |
140 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
141 | kfree(cmd); | |
e120237c BZ |
142 | } |
143 | ||
a9587fd8 | 144 | int ide_complete_rq(ide_drive_t *drive, int error) |
1da177e4 | 145 | { |
b65fac32 BZ |
146 | ide_hwif_t *hwif = drive->hwif; |
147 | struct request *rq = hwif->rq; | |
a9587fd8 | 148 | int rc; |
1da177e4 | 149 | |
a9587fd8 BZ |
150 | rc = blk_end_request(rq, error, blk_rq_bytes(rq)); |
151 | if (rc == 0) | |
152 | hwif->rq = NULL; | |
1d0bf587 | 153 | |
a9587fd8 | 154 | return rc; |
1da177e4 | 155 | } |
a09485df | 156 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 157 | |
327fa1c2 | 158 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 159 | { |
3ee38302 BZ |
160 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
161 | u8 media = drive->media; | |
162 | ||
c152cc1a BZ |
163 | drive->failed_pc = NULL; |
164 | ||
6902a533 BZ |
165 | if ((media == ide_floppy || media == ide_tape) && drv_req) { |
166 | rq->errors = 0; | |
3ee38302 | 167 | ide_complete_rq(drive, 0); |
6902a533 BZ |
168 | } else { |
169 | if (media == ide_tape) | |
170 | rq->errors = IDE_DRV_ERROR_GENERAL; | |
89f78b32 BZ |
171 | else if (blk_fs_request(rq) == 0 && rq->errors == 0) |
172 | rq->errors = -EIO; | |
1da177e4 | 173 | ide_end_request(drive, 0, 0); |
6902a533 | 174 | } |
1da177e4 LT |
175 | } |
176 | ||
57d7366b | 177 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 178 | { |
57d7366b BZ |
179 | tf->nsect = drive->sect; |
180 | tf->lbal = drive->sect; | |
181 | tf->lbam = drive->cyl; | |
182 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 183 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 184 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
185 | } |
186 | ||
57d7366b | 187 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 188 | { |
57d7366b | 189 | tf->nsect = drive->sect; |
aaaade3f | 190 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
191 | } |
192 | ||
57d7366b | 193 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 194 | { |
57d7366b | 195 | tf->nsect = drive->mult_req; |
aaaade3f | 196 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
197 | } |
198 | ||
199 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
200 | { | |
201 | special_t *s = &drive->special; | |
22aa4b32 | 202 | struct ide_cmd cmd; |
1da177e4 | 203 | |
22aa4b32 | 204 | memset(&cmd, 0, sizeof(cmd)); |
0dfb991c | 205 | cmd.protocol = ATA_PROT_NODATA; |
1da177e4 LT |
206 | |
207 | if (s->b.set_geometry) { | |
208 | s->b.set_geometry = 0; | |
22aa4b32 | 209 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
1da177e4 LT |
210 | } else if (s->b.recalibrate) { |
211 | s->b.recalibrate = 0; | |
22aa4b32 | 212 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
1da177e4 LT |
213 | } else if (s->b.set_multmode) { |
214 | s->b.set_multmode = 0; | |
22aa4b32 | 215 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
1da177e4 LT |
216 | } else if (s->all) { |
217 | int special = s->all; | |
218 | s->all = 0; | |
219 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
220 | return ide_stopped; | |
221 | } | |
222 | ||
22aa4b32 BZ |
223 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
224 | IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 225 | |
22aa4b32 | 226 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
227 | |
228 | return ide_started; | |
229 | } | |
230 | ||
231 | /** | |
232 | * do_special - issue some special commands | |
233 | * @drive: drive the command is for | |
234 | * | |
aaaade3f BZ |
235 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
236 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
237 | * | |
238 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
239 | */ |
240 | ||
241 | static ide_startstop_t do_special (ide_drive_t *drive) | |
242 | { | |
243 | special_t *s = &drive->special; | |
244 | ||
245 | #ifdef DEBUG | |
246 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
247 | #endif | |
6982daf7 BZ |
248 | if (drive->media == ide_disk) |
249 | return ide_disk_special(drive); | |
1da177e4 | 250 | |
6982daf7 BZ |
251 | s->all = 0; |
252 | drive->mult_req = 0; | |
253 | return ide_stopped; | |
1da177e4 LT |
254 | } |
255 | ||
256 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
257 | { | |
258 | ide_hwif_t *hwif = drive->hwif; | |
b6308ee0 | 259 | struct ide_cmd *cmd = &hwif->cmd; |
1da177e4 LT |
260 | struct scatterlist *sg = hwif->sg_table; |
261 | ||
9e772d01 | 262 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 | 263 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
b6308ee0 | 264 | cmd->sg_nents = 1; |
9e772d01 BP |
265 | } else if (!rq->bio) { |
266 | sg_init_one(sg, rq->data, rq->data_len); | |
b6308ee0 BZ |
267 | cmd->sg_nents = 1; |
268 | } else | |
269 | cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 | 270 | } |
1da177e4 LT |
271 | EXPORT_SYMBOL_GPL(ide_map_sg); |
272 | ||
b6308ee0 | 273 | void ide_init_sg_cmd(struct ide_cmd *cmd, int nsect) |
1da177e4 | 274 | { |
b6308ee0 BZ |
275 | cmd->nsect = cmd->nleft = nsect; |
276 | cmd->cursg_ofs = 0; | |
277 | cmd->cursg = NULL; | |
1da177e4 | 278 | } |
1da177e4 LT |
279 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
280 | ||
281 | /** | |
282 | * execute_drive_command - issue special drive command | |
338cec32 | 283 | * @drive: the drive to issue the command on |
1da177e4 LT |
284 | * @rq: the request structure holding the command |
285 | * | |
286 | * execute_drive_cmd() issues a special drive command, usually | |
287 | * initiated by ioctl() from the external hdparm program. The | |
288 | * command can be a drive command, drive task or taskfile | |
289 | * operation. Weirdly you can call it with NULL to wait for | |
290 | * all commands to finish. Don't do this as that is due to change | |
291 | */ | |
292 | ||
293 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
294 | struct request *rq) | |
295 | { | |
22aa4b32 | 296 | struct ide_cmd *cmd = rq->special; |
1da177e4 | 297 | |
22aa4b32 | 298 | if (cmd) { |
0dfb991c | 299 | if (cmd->protocol == ATA_PROT_PIO) { |
b6308ee0 | 300 | ide_init_sg_cmd(cmd, rq->nr_sectors); |
1da177e4 | 301 | ide_map_sg(drive, rq); |
1da177e4 | 302 | } |
74095a91 | 303 | |
22aa4b32 | 304 | return do_rw_taskfile(drive, cmd); |
21d535c9 BZ |
305 | } |
306 | ||
1da177e4 LT |
307 | /* |
308 | * NULL is actually a valid way of waiting for | |
309 | * all current requests to be flushed from the queue. | |
310 | */ | |
311 | #ifdef DEBUG | |
312 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
313 | #endif | |
6902a533 | 314 | rq->errors = 0; |
5e76acd5 | 315 | ide_complete_rq(drive, 0); |
64a57fe4 | 316 | |
1da177e4 | 317 | return ide_stopped; |
1bc6daae BZ |
318 | } |
319 | ||
79e36a9f EO |
320 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
321 | { | |
4abdc6ee EO |
322 | u8 cmd = rq->cmd[0]; |
323 | ||
4abdc6ee | 324 | switch (cmd) { |
1bc6daae BZ |
325 | case REQ_PARK_HEADS: |
326 | case REQ_UNPARK_HEADS: | |
327 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 328 | case REQ_DEVSET_EXEC: |
1bc6daae | 329 | return ide_do_devset(drive, rq); |
79e36a9f EO |
330 | case REQ_DRIVE_RESET: |
331 | return ide_do_reset(drive); | |
332 | default: | |
1713788f | 333 | BUG(); |
79e36a9f EO |
334 | } |
335 | } | |
336 | ||
1da177e4 LT |
337 | /** |
338 | * start_request - start of I/O and command issuing for IDE | |
339 | * | |
340 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 341 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
342 | * |
343 | * FIXME: this function needs a rename | |
344 | */ | |
345 | ||
346 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
347 | { | |
348 | ide_startstop_t startstop; | |
1da177e4 | 349 | |
4aff5e23 | 350 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
351 | |
352 | #ifdef DEBUG | |
353 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 354 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
355 | #endif |
356 | ||
357 | /* bail early if we've exceeded max_failures */ | |
358 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 359 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
360 | goto kill_rq; |
361 | } | |
362 | ||
ad3cadda JA |
363 | if (blk_pm_request(rq)) |
364 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
365 | |
366 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
367 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
368 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
369 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
370 | return startstop; | |
371 | } | |
372 | if (!drive->special.all) { | |
7f3c868b | 373 | struct ide_driver *drv; |
1da177e4 | 374 | |
513daadd SS |
375 | /* |
376 | * We reset the drive so we need to issue a SETFEATURES. | |
377 | * Do it _after_ do_special() restored device parameters. | |
378 | */ | |
379 | if (drive->current_speed == 0xff) | |
380 | ide_config_drive_speed(drive, drive->desired_speed); | |
381 | ||
7267c337 | 382 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
383 | return execute_drive_cmd(drive, rq); |
384 | else if (blk_pm_request(rq)) { | |
c00895ab | 385 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
386 | #ifdef DEBUG_PM |
387 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 388 | drive->name, pm->pm_step); |
1da177e4 LT |
389 | #endif |
390 | startstop = ide_start_power_step(drive, rq); | |
391 | if (startstop == ide_stopped && | |
0d346ba0 | 392 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 393 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 394 | return startstop; |
79e36a9f EO |
395 | } else if (!rq->rq_disk && blk_special_request(rq)) |
396 | /* | |
397 | * TODO: Once all ULDs have been modified to | |
398 | * check for specific op codes rather than | |
399 | * blindly accepting any special request, the | |
400 | * check for ->rq_disk above may be replaced | |
401 | * by a more suitable mechanism or even | |
402 | * dropped entirely. | |
403 | */ | |
404 | return ide_special_rq(drive, rq); | |
1da177e4 | 405 | |
7f3c868b | 406 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
407 | |
408 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
409 | } |
410 | return do_special(drive); | |
411 | kill_rq: | |
412 | ide_kill_rq(drive, rq); | |
413 | return ide_stopped; | |
414 | } | |
415 | ||
416 | /** | |
417 | * ide_stall_queue - pause an IDE device | |
418 | * @drive: drive to stall | |
419 | * @timeout: time to stall for (jiffies) | |
420 | * | |
421 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 422 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
423 | */ |
424 | ||
425 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
426 | { | |
427 | if (timeout > WAIT_WORSTCASE) | |
428 | timeout = WAIT_WORSTCASE; | |
429 | drive->sleep = timeout + jiffies; | |
97100fc8 | 430 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 431 | } |
1da177e4 LT |
432 | EXPORT_SYMBOL(ide_stall_queue); |
433 | ||
5b31f855 BZ |
434 | static inline int ide_lock_port(ide_hwif_t *hwif) |
435 | { | |
436 | if (hwif->busy) | |
437 | return 1; | |
438 | ||
439 | hwif->busy = 1; | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
445 | { | |
446 | hwif->busy = 0; | |
447 | } | |
448 | ||
449 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
450 | { | |
451 | int rc = 0; | |
452 | ||
453 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
454 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
455 | if (rc == 0) { | |
e354c1d8 BZ |
456 | if (host->get_lock) |
457 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
458 | } |
459 | } | |
460 | return rc; | |
461 | } | |
462 | ||
463 | static inline void ide_unlock_host(struct ide_host *host) | |
464 | { | |
465 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
466 | if (host->release_lock) |
467 | host->release_lock(); | |
5b31f855 BZ |
468 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
469 | } | |
470 | } | |
471 | ||
1da177e4 | 472 | /* |
b65fac32 | 473 | * Issue a new request to a device. |
1da177e4 | 474 | */ |
295f0004 | 475 | void do_ide_request(struct request_queue *q) |
1da177e4 | 476 | { |
201bffa4 BZ |
477 | ide_drive_t *drive = q->queuedata; |
478 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 479 | struct ide_host *host = hwif->host; |
5b31f855 | 480 | struct request *rq = NULL; |
1da177e4 LT |
481 | ide_startstop_t startstop; |
482 | ||
201bffa4 BZ |
483 | /* |
484 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
485 | * though that is 3 requests, it must be seen as a single transaction. | |
486 | * we must not preempt this drive until that is complete | |
487 | */ | |
488 | if (blk_queue_flushing(q)) | |
1da177e4 | 489 | /* |
201bffa4 BZ |
490 | * small race where queue could get replugged during |
491 | * the 3-request flush cycle, just yank the plug since | |
492 | * we want it to finish asap | |
1da177e4 | 493 | */ |
201bffa4 | 494 | blk_remove_plug(q); |
1da177e4 | 495 | |
201bffa4 | 496 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
497 | |
498 | if (ide_lock_host(host, hwif)) | |
499 | goto plug_device_2; | |
500 | ||
b65fac32 | 501 | spin_lock_irq(&hwif->lock); |
295f0004 | 502 | |
5b31f855 | 503 | if (!ide_lock_port(hwif)) { |
42cf2611 | 504 | ide_hwif_t *prev_port; |
201bffa4 | 505 | repeat: |
bd53cbcc | 506 | prev_port = hwif->host->cur_port; |
b65fac32 | 507 | hwif->rq = NULL; |
2fb21150 | 508 | |
201bffa4 BZ |
509 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
510 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 511 | ide_unlock_port(hwif); |
201bffa4 BZ |
512 | goto plug_device; |
513 | } | |
514 | } | |
295f0004 | 515 | |
bd53cbcc BZ |
516 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
517 | hwif != prev_port) { | |
7299a391 | 518 | /* |
42cf2611 | 519 | * set nIEN for previous port, drives in the |
7299a391 BZ |
520 | * quirk_list may not like intr setups/cleanups |
521 | */ | |
b65fac32 | 522 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 523 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
524 | |
525 | hwif->host->cur_port = hwif; | |
1da177e4 | 526 | } |
b65fac32 | 527 | hwif->cur_dev = drive; |
4abdc6ee | 528 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 529 | |
b65fac32 | 530 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 531 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
532 | /* |
533 | * we know that the queue isn't empty, but this can happen | |
534 | * if the q->prep_rq_fn() decides to kill a request | |
535 | */ | |
536 | rq = elv_next_request(drive->queue); | |
201bffa4 | 537 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 538 | spin_lock_irq(&hwif->lock); |
201bffa4 | 539 | |
1da177e4 | 540 | if (!rq) { |
5b31f855 | 541 | ide_unlock_port(hwif); |
201bffa4 | 542 | goto out; |
1da177e4 LT |
543 | } |
544 | ||
545 | /* | |
546 | * Sanity: don't accept a request that isn't a PM request | |
547 | * if we are currently power managed. This is very important as | |
548 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
549 | * above to return us whatever is in the queue. Since we call | |
550 | * ide_do_request() ourselves, we end up taking requests while | |
551 | * the queue is blocked... | |
552 | * | |
553 | * We let requests forced at head of queue with ide-preempt | |
554 | * though. I hope that doesn't happen too much, hopefully not | |
555 | * unless the subdriver triggers such a thing in its own PM | |
556 | * state machine. | |
557 | */ | |
97100fc8 BZ |
558 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
559 | blk_pm_request(rq) == 0 && | |
560 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 561 | /* there should be no pending command at this point */ |
5b31f855 | 562 | ide_unlock_port(hwif); |
295f0004 | 563 | goto plug_device; |
1da177e4 LT |
564 | } |
565 | ||
b65fac32 | 566 | hwif->rq = rq; |
1da177e4 | 567 | |
b65fac32 | 568 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 569 | startstop = start_request(drive, rq); |
b65fac32 | 570 | spin_lock_irq(&hwif->lock); |
295f0004 | 571 | |
201bffa4 BZ |
572 | if (startstop == ide_stopped) |
573 | goto repeat; | |
574 | } else | |
575 | goto plug_device; | |
576 | out: | |
b65fac32 | 577 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
578 | if (rq == NULL) |
579 | ide_unlock_host(host); | |
201bffa4 | 580 | spin_lock_irq(q->queue_lock); |
295f0004 | 581 | return; |
1da177e4 | 582 | |
295f0004 | 583 | plug_device: |
b65fac32 | 584 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
585 | ide_unlock_host(host); |
586 | plug_device_2: | |
201bffa4 BZ |
587 | spin_lock_irq(q->queue_lock); |
588 | ||
589 | if (!elv_queue_empty(q)) | |
590 | blk_plug_device(q); | |
1da177e4 LT |
591 | } |
592 | ||
201bffa4 BZ |
593 | static void ide_plug_device(ide_drive_t *drive) |
594 | { | |
595 | struct request_queue *q = drive->queue; | |
596 | unsigned long flags; | |
597 | ||
598 | spin_lock_irqsave(q->queue_lock, flags); | |
599 | if (!elv_queue_empty(q)) | |
600 | blk_plug_device(q); | |
601 | spin_unlock_irqrestore(q->queue_lock, flags); | |
602 | } | |
603 | ||
b6a45a0b BZ |
604 | static int drive_is_ready(ide_drive_t *drive) |
605 | { | |
606 | ide_hwif_t *hwif = drive->hwif; | |
607 | u8 stat = 0; | |
608 | ||
609 | if (drive->waiting_for_dma) | |
610 | return hwif->dma_ops->dma_test_irq(drive); | |
611 | ||
612 | if (hwif->io_ports.ctl_addr && | |
613 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
614 | stat = hwif->tp_ops->read_altstatus(hwif); | |
615 | else | |
616 | /* Note: this may clear a pending IRQ!! */ | |
617 | stat = hwif->tp_ops->read_status(hwif); | |
618 | ||
619 | if (stat & ATA_BUSY) | |
620 | /* drive busy: definitely not interrupting */ | |
621 | return 0; | |
622 | ||
623 | /* drive ready: *might* be interrupting */ | |
624 | return 1; | |
625 | } | |
626 | ||
1da177e4 LT |
627 | /** |
628 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 629 | * @data: timer callback magic (hwif) |
1da177e4 LT |
630 | * |
631 | * An IDE command has timed out before the expected drive return | |
632 | * occurred. At this point we attempt to clean up the current | |
633 | * mess. If the current handler includes an expiry handler then | |
634 | * we invoke the expiry handler, and providing it is happy the | |
635 | * work is done. If that fails we apply generic recovery rules | |
636 | * invoking the handler and checking the drive DMA status. We | |
637 | * have an excessively incestuous relationship with the DMA | |
638 | * logic that wants cleaning up. | |
639 | */ | |
640 | ||
641 | void ide_timer_expiry (unsigned long data) | |
642 | { | |
b65fac32 | 643 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 644 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 645 | ide_handler_t *handler; |
1da177e4 | 646 | unsigned long flags; |
e0c6dcd8 | 647 | int wait = -1; |
201bffa4 | 648 | int plug_device = 0; |
1da177e4 | 649 | |
b65fac32 BZ |
650 | spin_lock_irqsave(&hwif->lock, flags); |
651 | ||
652 | handler = hwif->handler; | |
1da177e4 | 653 | |
b65fac32 | 654 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
655 | /* |
656 | * Either a marginal timeout occurred | |
657 | * (got the interrupt just as timer expired), | |
658 | * or we were "sleeping" to give other devices a chance. | |
659 | * Either way, we don't really want to complain about anything. | |
660 | */ | |
1da177e4 | 661 | } else { |
c38714ed BZ |
662 | ide_expiry_t *expiry = hwif->expiry; |
663 | ide_startstop_t startstop = ide_stopped; | |
664 | ||
b65fac32 | 665 | drive = hwif->cur_dev; |
c38714ed BZ |
666 | |
667 | if (expiry) { | |
668 | wait = expiry(drive); | |
669 | if (wait > 0) { /* continue */ | |
670 | /* reset timer */ | |
671 | hwif->timer.expires = jiffies + wait; | |
672 | hwif->req_gen_timer = hwif->req_gen; | |
673 | add_timer(&hwif->timer); | |
674 | spin_unlock_irqrestore(&hwif->lock, flags); | |
675 | return; | |
295f0004 | 676 | } |
1da177e4 | 677 | } |
c38714ed BZ |
678 | hwif->handler = NULL; |
679 | /* | |
680 | * We need to simulate a real interrupt when invoking | |
681 | * the handler() function, which means we need to | |
682 | * globally mask the specific IRQ: | |
683 | */ | |
684 | spin_unlock(&hwif->lock); | |
685 | /* disable_irq_nosync ?? */ | |
686 | disable_irq(hwif->irq); | |
687 | /* local CPU only, as if we were handling an interrupt */ | |
688 | local_irq_disable(); | |
689 | if (hwif->polling) { | |
690 | startstop = handler(drive); | |
691 | } else if (drive_is_ready(drive)) { | |
692 | if (drive->waiting_for_dma) | |
693 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
694 | if (hwif->ack_intr) |
695 | hwif->ack_intr(hwif); | |
c38714ed BZ |
696 | printk(KERN_WARNING "%s: lost interrupt\n", |
697 | drive->name); | |
698 | startstop = handler(drive); | |
699 | } else { | |
700 | if (drive->waiting_for_dma) | |
701 | startstop = ide_dma_timeout_retry(drive, wait); | |
702 | else | |
703 | startstop = ide_error(drive, "irq timeout", | |
704 | hwif->tp_ops->read_status(hwif)); | |
705 | } | |
706 | spin_lock_irq(&hwif->lock); | |
707 | enable_irq(hwif->irq); | |
708 | if (startstop == ide_stopped) { | |
709 | ide_unlock_port(hwif); | |
710 | plug_device = 1; | |
711 | } | |
1da177e4 | 712 | } |
b65fac32 | 713 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 714 | |
5b31f855 BZ |
715 | if (plug_device) { |
716 | ide_unlock_host(hwif->host); | |
201bffa4 | 717 | ide_plug_device(drive); |
5b31f855 | 718 | } |
1da177e4 LT |
719 | } |
720 | ||
721 | /** | |
722 | * unexpected_intr - handle an unexpected IDE interrupt | |
723 | * @irq: interrupt line | |
bd53cbcc | 724 | * @hwif: port being processed |
1da177e4 LT |
725 | * |
726 | * There's nothing really useful we can do with an unexpected interrupt, | |
727 | * other than reading the status register (to clear it), and logging it. | |
728 | * There should be no way that an irq can happen before we're ready for it, | |
729 | * so we needn't worry much about losing an "important" interrupt here. | |
730 | * | |
731 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
732 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
733 | * looks "good", we just ignore the interrupt completely. | |
734 | * | |
735 | * This routine assumes __cli() is in effect when called. | |
736 | * | |
737 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
738 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
739 | * we could screw up by interfering with a new request being set up for | |
740 | * irq15. | |
741 | * | |
742 | * In reality, this is a non-issue. The new command is not sent unless | |
743 | * the drive is ready to accept one, in which case we know the drive is | |
744 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
745 | * before completing the issuance of any new drive command, so we will not | |
746 | * be accidentally invoked as a result of any valid command completion | |
747 | * interrupt. | |
1da177e4 | 748 | */ |
bd53cbcc BZ |
749 | |
750 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 751 | { |
ae86afae BZ |
752 | u8 stat = hwif->tp_ops->read_status(hwif); |
753 | ||
754 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
755 | /* Try to not flood the console with msgs */ | |
756 | static unsigned long last_msgtime, count; | |
757 | ++count; | |
758 | ||
759 | if (time_after(jiffies, last_msgtime + HZ)) { | |
760 | last_msgtime = jiffies; | |
761 | printk(KERN_ERR "%s: unexpected interrupt, " | |
762 | "status=0x%02x, count=%ld\n", | |
763 | hwif->name, stat, count); | |
1da177e4 | 764 | } |
ae86afae | 765 | } |
1da177e4 LT |
766 | } |
767 | ||
768 | /** | |
769 | * ide_intr - default IDE interrupt handler | |
770 | * @irq: interrupt number | |
ae86afae | 771 | * @dev_id: hwif |
1da177e4 LT |
772 | * @regs: unused weirdness from the kernel irq layer |
773 | * | |
774 | * This is the default IRQ handler for the IDE layer. You should | |
775 | * not need to override it. If you do be aware it is subtle in | |
776 | * places | |
777 | * | |
bd53cbcc | 778 | * hwif is the interface in the group currently performing |
b65fac32 | 779 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
780 | * the IRQ handler to call. As we issue a command the handlers |
781 | * step through multiple states, reassigning the handler to the | |
782 | * next step in the process. Unlike a smart SCSI controller IDE | |
783 | * expects the main processor to sequence the various transfer | |
784 | * stages. We also manage a poll timer to catch up with most | |
785 | * timeout situations. There are still a few where the handlers | |
786 | * don't ever decide to give up. | |
787 | * | |
788 | * The handler eventually returns ide_stopped to indicate the | |
789 | * request completed. At this point we issue the next request | |
b65fac32 | 790 | * on the port and the process begins again. |
1da177e4 | 791 | */ |
b65fac32 | 792 | |
7d12e780 | 793 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 794 | { |
ae86afae | 795 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 796 | struct ide_host *host = hwif->host; |
201bffa4 | 797 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 798 | ide_handler_t *handler; |
ae86afae | 799 | unsigned long flags; |
1da177e4 | 800 | ide_startstop_t startstop; |
3e0e29f7 | 801 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 802 | int plug_device = 0; |
1da177e4 | 803 | |
255115fb BZ |
804 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
805 | if (hwif != host->cur_port) | |
ae86afae BZ |
806 | goto out_early; |
807 | } | |
bd53cbcc | 808 | |
b65fac32 | 809 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 810 | |
d15a613b | 811 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 812 | goto out; |
1da177e4 | 813 | |
b65fac32 BZ |
814 | handler = hwif->handler; |
815 | ||
816 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
817 | /* |
818 | * Not expecting an interrupt from this drive. | |
819 | * That means this could be: | |
820 | * (1) an interrupt from another PCI device | |
821 | * sharing the same PCI INT# as us. | |
822 | * or (2) a drive just entered sleep or standby mode, | |
823 | * and is interrupting to let us know. | |
824 | * or (3) a spurious interrupt of unknown origin. | |
825 | * | |
826 | * For PCI, we cannot tell the difference, | |
827 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 828 | */ |
255115fb | 829 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
830 | /* |
831 | * Probably not a shared PCI interrupt, | |
832 | * so we can safely try to do something about it: | |
833 | */ | |
bd53cbcc | 834 | unexpected_intr(irq, hwif); |
1da177e4 LT |
835 | } else { |
836 | /* | |
837 | * Whack the status register, just in case | |
838 | * we have a leftover pending IRQ. | |
839 | */ | |
374e042c | 840 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 841 | } |
3e0e29f7 | 842 | goto out; |
1da177e4 | 843 | } |
3e0e29f7 | 844 | |
b65fac32 | 845 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
846 | |
847 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
848 | /* |
849 | * This happens regularly when we share a PCI IRQ with | |
850 | * another device. Unfortunately, it can also happen | |
851 | * with some buggy drives that trigger the IRQ before | |
852 | * their status register is up to date. Hopefully we have | |
853 | * enough advance overhead that the latter isn't a problem. | |
854 | */ | |
3e0e29f7 BZ |
855 | goto out; |
856 | ||
b65fac32 BZ |
857 | hwif->handler = NULL; |
858 | hwif->req_gen++; | |
859 | del_timer(&hwif->timer); | |
860 | spin_unlock(&hwif->lock); | |
1da177e4 | 861 | |
bfa7d8e5 BZ |
862 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
863 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 864 | |
97100fc8 | 865 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 866 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 867 | |
1da177e4 LT |
868 | /* service this interrupt, may set handler for next interrupt */ |
869 | startstop = handler(drive); | |
1da177e4 | 870 | |
b65fac32 | 871 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
872 | /* |
873 | * Note that handler() may have set things up for another | |
874 | * interrupt to occur soon, but it cannot happen until | |
875 | * we exit from this routine, because it will be the | |
876 | * same irq as is currently being serviced here, and Linux | |
877 | * won't allow another of the same (on any CPU) until we return. | |
878 | */ | |
1da177e4 | 879 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
880 | BUG_ON(hwif->handler); |
881 | ide_unlock_port(hwif); | |
882 | plug_device = 1; | |
1da177e4 | 883 | } |
3e0e29f7 BZ |
884 | irq_ret = IRQ_HANDLED; |
885 | out: | |
b65fac32 | 886 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 887 | out_early: |
5b31f855 BZ |
888 | if (plug_device) { |
889 | ide_unlock_host(hwif->host); | |
201bffa4 | 890 | ide_plug_device(drive); |
5b31f855 | 891 | } |
201bffa4 | 892 | |
3e0e29f7 | 893 | return irq_ret; |
1da177e4 | 894 | } |
849d7130 | 895 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 896 | |
9f87abe8 BZ |
897 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
898 | { | |
899 | ide_hwif_t *hwif = drive->hwif; | |
900 | u8 buf[4] = { 0 }; | |
901 | ||
902 | while (len > 0) { | |
903 | if (write) | |
374e042c | 904 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 905 | else |
374e042c | 906 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
907 | len -= 4; |
908 | } | |
909 | } | |
910 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |