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 | |
1caf236d BZ |
57 | int ide_end_rq(ide_drive_t *drive, struct request *rq, int uptodate, |
58 | unsigned int nr_bytes) | |
1da177e4 | 59 | { |
5e36bb6e KU |
60 | int error = 0; |
61 | ||
62 | if (uptodate <= 0) | |
63 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 64 | |
1da177e4 LT |
65 | /* |
66 | * if failfast is set on a request, override number of sectors and | |
67 | * complete the whole request right now | |
68 | */ | |
5e36bb6e | 69 | if (blk_noretry_request(rq) && error) |
41e9d344 | 70 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 71 | |
5e36bb6e | 72 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
73 | rq->errors = -EIO; |
74 | ||
75 | /* | |
76 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
77 | * if we DMA timeout more than 3 times, just stay in PIO | |
78 | */ | |
c3922048 BZ |
79 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
80 | drive->retry_pio <= 3) { | |
81 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 82 | ide_dma_on(drive); |
1da177e4 LT |
83 | } |
84 | ||
1caf236d | 85 | return blk_end_request(rq, error, nr_bytes); |
1da177e4 | 86 | } |
1caf236d | 87 | EXPORT_SYMBOL_GPL(ide_end_rq); |
1da177e4 LT |
88 | |
89 | /** | |
90 | * ide_end_request - complete an IDE I/O | |
91 | * @drive: IDE device for the I/O | |
92 | * @uptodate: | |
93 | * @nr_sectors: number of sectors completed | |
94 | * | |
95 | * This is our end_request wrapper function. We complete the I/O | |
96 | * update random number input and dequeue the request, which if | |
97 | * it was tagged may be out of order. | |
98 | */ | |
99 | ||
100 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
101 | { | |
41e9d344 | 102 | unsigned int nr_bytes = nr_sectors << 9; |
b65fac32 | 103 | struct request *rq = drive->hwif->rq; |
1caf236d | 104 | int rc; |
1da177e4 | 105 | |
41e9d344 JA |
106 | if (!nr_bytes) { |
107 | if (blk_pc_request(rq)) | |
108 | nr_bytes = rq->data_len; | |
109 | else | |
110 | nr_bytes = rq->hard_cur_sectors << 9; | |
111 | } | |
1da177e4 | 112 | |
1caf236d BZ |
113 | rc = ide_end_rq(drive, rq, uptodate, nr_bytes); |
114 | if (rc == 0) | |
115 | drive->hwif->rq = NULL; | |
1d0bf587 | 116 | |
1caf236d | 117 | return rc; |
dbe217af | 118 | } |
1caf236d | 119 | EXPORT_SYMBOL(ide_end_request); |
dbe217af | 120 | |
22aa4b32 | 121 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 122 | { |
22aa4b32 BZ |
123 | struct ide_taskfile *tf = &cmd->tf; |
124 | struct request *rq = cmd->rq; | |
e7fedc3c | 125 | u8 tf_cmd = tf->command; |
e120237c BZ |
126 | |
127 | tf->error = err; | |
128 | tf->status = stat; | |
129 | ||
22aa4b32 | 130 | drive->hwif->tp_ops->tf_read(drive, cmd); |
e120237c | 131 | |
e7fedc3c BZ |
132 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
133 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { | |
134 | if (tf->lbal != 0xc4) { | |
135 | printk(KERN_ERR "%s: head unload failed!\n", | |
136 | drive->name); | |
137 | ide_tf_dump(drive->name, tf); | |
138 | } else | |
139 | drive->dev_flags |= IDE_DFLAG_PARKED; | |
140 | } | |
141 | ||
a09485df | 142 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
22aa4b32 | 143 | memcpy(rq->special, cmd, sizeof(*cmd)); |
a09485df | 144 | |
22aa4b32 BZ |
145 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
146 | kfree(cmd); | |
e120237c BZ |
147 | } |
148 | ||
a09485df | 149 | void ide_complete_rq(ide_drive_t *drive, u8 err) |
1da177e4 | 150 | { |
b65fac32 BZ |
151 | ide_hwif_t *hwif = drive->hwif; |
152 | struct request *rq = hwif->rq; | |
1da177e4 | 153 | |
b65fac32 | 154 | hwif->rq = NULL; |
1d0bf587 | 155 | |
1da177e4 | 156 | rq->errors = err; |
1d0bf587 | 157 | |
3c8a2cce BZ |
158 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
159 | blk_rq_bytes(rq)))) | |
5e36bb6e | 160 | BUG(); |
1da177e4 | 161 | } |
a09485df | 162 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 163 | |
327fa1c2 | 164 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 165 | { |
3ee38302 BZ |
166 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
167 | u8 media = drive->media; | |
168 | ||
c152cc1a BZ |
169 | drive->failed_pc = NULL; |
170 | ||
3ee38302 | 171 | if ((media == ide_floppy && drv_req) || media == ide_tape) |
c152cc1a BZ |
172 | rq->errors = IDE_DRV_ERROR_GENERAL; |
173 | ||
3ee38302 BZ |
174 | if ((media == ide_floppy || media == ide_tape) && drv_req) |
175 | ide_complete_rq(drive, 0); | |
176 | else | |
1da177e4 LT |
177 | ide_end_request(drive, 0, 0); |
178 | } | |
179 | ||
57d7366b | 180 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 181 | { |
57d7366b BZ |
182 | tf->nsect = drive->sect; |
183 | tf->lbal = drive->sect; | |
184 | tf->lbam = drive->cyl; | |
185 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 186 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 187 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
188 | } |
189 | ||
57d7366b | 190 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 191 | { |
57d7366b | 192 | tf->nsect = drive->sect; |
aaaade3f | 193 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
194 | } |
195 | ||
57d7366b | 196 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 197 | { |
57d7366b | 198 | tf->nsect = drive->mult_req; |
aaaade3f | 199 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
200 | } |
201 | ||
202 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
203 | { | |
204 | special_t *s = &drive->special; | |
22aa4b32 | 205 | struct ide_cmd cmd; |
1da177e4 | 206 | |
22aa4b32 | 207 | memset(&cmd, 0, sizeof(cmd)); |
0dfb991c | 208 | cmd.protocol = ATA_PROT_NODATA; |
1da177e4 LT |
209 | |
210 | if (s->b.set_geometry) { | |
211 | s->b.set_geometry = 0; | |
22aa4b32 | 212 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
1da177e4 LT |
213 | } else if (s->b.recalibrate) { |
214 | s->b.recalibrate = 0; | |
22aa4b32 | 215 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
1da177e4 LT |
216 | } else if (s->b.set_multmode) { |
217 | s->b.set_multmode = 0; | |
22aa4b32 | 218 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
1da177e4 LT |
219 | } else if (s->all) { |
220 | int special = s->all; | |
221 | s->all = 0; | |
222 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
223 | return ide_stopped; | |
224 | } | |
225 | ||
22aa4b32 BZ |
226 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
227 | IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 228 | |
22aa4b32 | 229 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
230 | |
231 | return ide_started; | |
232 | } | |
233 | ||
234 | /** | |
235 | * do_special - issue some special commands | |
236 | * @drive: drive the command is for | |
237 | * | |
aaaade3f BZ |
238 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
239 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
240 | * | |
241 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
242 | */ |
243 | ||
244 | static ide_startstop_t do_special (ide_drive_t *drive) | |
245 | { | |
246 | special_t *s = &drive->special; | |
247 | ||
248 | #ifdef DEBUG | |
249 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
250 | #endif | |
6982daf7 BZ |
251 | if (drive->media == ide_disk) |
252 | return ide_disk_special(drive); | |
1da177e4 | 253 | |
6982daf7 BZ |
254 | s->all = 0; |
255 | drive->mult_req = 0; | |
256 | return ide_stopped; | |
1da177e4 LT |
257 | } |
258 | ||
259 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
260 | { | |
261 | ide_hwif_t *hwif = drive->hwif; | |
b6308ee0 | 262 | struct ide_cmd *cmd = &hwif->cmd; |
1da177e4 LT |
263 | struct scatterlist *sg = hwif->sg_table; |
264 | ||
9e772d01 | 265 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 | 266 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
b6308ee0 | 267 | cmd->sg_nents = 1; |
9e772d01 BP |
268 | } else if (!rq->bio) { |
269 | sg_init_one(sg, rq->data, rq->data_len); | |
b6308ee0 BZ |
270 | cmd->sg_nents = 1; |
271 | } else | |
272 | cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 | 273 | } |
1da177e4 LT |
274 | EXPORT_SYMBOL_GPL(ide_map_sg); |
275 | ||
b6308ee0 | 276 | void ide_init_sg_cmd(struct ide_cmd *cmd, int nsect) |
1da177e4 | 277 | { |
b6308ee0 BZ |
278 | cmd->nsect = cmd->nleft = nsect; |
279 | cmd->cursg_ofs = 0; | |
280 | cmd->cursg = NULL; | |
1da177e4 | 281 | } |
1da177e4 LT |
282 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
283 | ||
284 | /** | |
285 | * execute_drive_command - issue special drive command | |
338cec32 | 286 | * @drive: the drive to issue the command on |
1da177e4 LT |
287 | * @rq: the request structure holding the command |
288 | * | |
289 | * execute_drive_cmd() issues a special drive command, usually | |
290 | * initiated by ioctl() from the external hdparm program. The | |
291 | * command can be a drive command, drive task or taskfile | |
292 | * operation. Weirdly you can call it with NULL to wait for | |
293 | * all commands to finish. Don't do this as that is due to change | |
294 | */ | |
295 | ||
296 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
297 | struct request *rq) | |
298 | { | |
22aa4b32 | 299 | struct ide_cmd *cmd = rq->special; |
1da177e4 | 300 | |
22aa4b32 | 301 | if (cmd) { |
0dfb991c | 302 | if (cmd->protocol == ATA_PROT_PIO) { |
b6308ee0 | 303 | ide_init_sg_cmd(cmd, rq->nr_sectors); |
1da177e4 | 304 | ide_map_sg(drive, rq); |
1da177e4 | 305 | } |
74095a91 | 306 | |
22aa4b32 | 307 | return do_rw_taskfile(drive, cmd); |
21d535c9 BZ |
308 | } |
309 | ||
1da177e4 LT |
310 | /* |
311 | * NULL is actually a valid way of waiting for | |
312 | * all current requests to be flushed from the queue. | |
313 | */ | |
314 | #ifdef DEBUG | |
315 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
316 | #endif | |
5e76acd5 | 317 | ide_complete_rq(drive, 0); |
64a57fe4 | 318 | |
1da177e4 | 319 | return ide_stopped; |
1bc6daae BZ |
320 | } |
321 | ||
79e36a9f EO |
322 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
323 | { | |
4abdc6ee EO |
324 | u8 cmd = rq->cmd[0]; |
325 | ||
4abdc6ee | 326 | switch (cmd) { |
1bc6daae BZ |
327 | case REQ_PARK_HEADS: |
328 | case REQ_UNPARK_HEADS: | |
329 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 330 | case REQ_DEVSET_EXEC: |
1bc6daae | 331 | return ide_do_devset(drive, rq); |
79e36a9f EO |
332 | case REQ_DRIVE_RESET: |
333 | return ide_do_reset(drive); | |
334 | default: | |
1713788f | 335 | BUG(); |
79e36a9f EO |
336 | } |
337 | } | |
338 | ||
1da177e4 LT |
339 | /** |
340 | * start_request - start of I/O and command issuing for IDE | |
341 | * | |
342 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 343 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
344 | * |
345 | * FIXME: this function needs a rename | |
346 | */ | |
347 | ||
348 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
349 | { | |
350 | ide_startstop_t startstop; | |
1da177e4 | 351 | |
4aff5e23 | 352 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
353 | |
354 | #ifdef DEBUG | |
355 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 356 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
357 | #endif |
358 | ||
359 | /* bail early if we've exceeded max_failures */ | |
360 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 361 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
362 | goto kill_rq; |
363 | } | |
364 | ||
ad3cadda JA |
365 | if (blk_pm_request(rq)) |
366 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
367 | |
368 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
369 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
370 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
371 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
372 | return startstop; | |
373 | } | |
374 | if (!drive->special.all) { | |
7f3c868b | 375 | struct ide_driver *drv; |
1da177e4 | 376 | |
513daadd SS |
377 | /* |
378 | * We reset the drive so we need to issue a SETFEATURES. | |
379 | * Do it _after_ do_special() restored device parameters. | |
380 | */ | |
381 | if (drive->current_speed == 0xff) | |
382 | ide_config_drive_speed(drive, drive->desired_speed); | |
383 | ||
7267c337 | 384 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
385 | return execute_drive_cmd(drive, rq); |
386 | else if (blk_pm_request(rq)) { | |
c00895ab | 387 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
388 | #ifdef DEBUG_PM |
389 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 390 | drive->name, pm->pm_step); |
1da177e4 LT |
391 | #endif |
392 | startstop = ide_start_power_step(drive, rq); | |
393 | if (startstop == ide_stopped && | |
0d346ba0 | 394 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 395 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 396 | return startstop; |
79e36a9f EO |
397 | } else if (!rq->rq_disk && blk_special_request(rq)) |
398 | /* | |
399 | * TODO: Once all ULDs have been modified to | |
400 | * check for specific op codes rather than | |
401 | * blindly accepting any special request, the | |
402 | * check for ->rq_disk above may be replaced | |
403 | * by a more suitable mechanism or even | |
404 | * dropped entirely. | |
405 | */ | |
406 | return ide_special_rq(drive, rq); | |
1da177e4 | 407 | |
7f3c868b | 408 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
409 | |
410 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
411 | } |
412 | return do_special(drive); | |
413 | kill_rq: | |
414 | ide_kill_rq(drive, rq); | |
415 | return ide_stopped; | |
416 | } | |
417 | ||
418 | /** | |
419 | * ide_stall_queue - pause an IDE device | |
420 | * @drive: drive to stall | |
421 | * @timeout: time to stall for (jiffies) | |
422 | * | |
423 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 424 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
425 | */ |
426 | ||
427 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
428 | { | |
429 | if (timeout > WAIT_WORSTCASE) | |
430 | timeout = WAIT_WORSTCASE; | |
431 | drive->sleep = timeout + jiffies; | |
97100fc8 | 432 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 433 | } |
1da177e4 LT |
434 | EXPORT_SYMBOL(ide_stall_queue); |
435 | ||
5b31f855 BZ |
436 | static inline int ide_lock_port(ide_hwif_t *hwif) |
437 | { | |
438 | if (hwif->busy) | |
439 | return 1; | |
440 | ||
441 | hwif->busy = 1; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
447 | { | |
448 | hwif->busy = 0; | |
449 | } | |
450 | ||
451 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
452 | { | |
453 | int rc = 0; | |
454 | ||
455 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
456 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
457 | if (rc == 0) { | |
e354c1d8 BZ |
458 | if (host->get_lock) |
459 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
460 | } |
461 | } | |
462 | return rc; | |
463 | } | |
464 | ||
465 | static inline void ide_unlock_host(struct ide_host *host) | |
466 | { | |
467 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
468 | if (host->release_lock) |
469 | host->release_lock(); | |
5b31f855 BZ |
470 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
471 | } | |
472 | } | |
473 | ||
1da177e4 | 474 | /* |
b65fac32 | 475 | * Issue a new request to a device. |
1da177e4 | 476 | */ |
295f0004 | 477 | void do_ide_request(struct request_queue *q) |
1da177e4 | 478 | { |
201bffa4 BZ |
479 | ide_drive_t *drive = q->queuedata; |
480 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 481 | struct ide_host *host = hwif->host; |
5b31f855 | 482 | struct request *rq = NULL; |
1da177e4 LT |
483 | ide_startstop_t startstop; |
484 | ||
201bffa4 BZ |
485 | /* |
486 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
487 | * though that is 3 requests, it must be seen as a single transaction. | |
488 | * we must not preempt this drive until that is complete | |
489 | */ | |
490 | if (blk_queue_flushing(q)) | |
1da177e4 | 491 | /* |
201bffa4 BZ |
492 | * small race where queue could get replugged during |
493 | * the 3-request flush cycle, just yank the plug since | |
494 | * we want it to finish asap | |
1da177e4 | 495 | */ |
201bffa4 | 496 | blk_remove_plug(q); |
1da177e4 | 497 | |
201bffa4 | 498 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
499 | |
500 | if (ide_lock_host(host, hwif)) | |
501 | goto plug_device_2; | |
502 | ||
b65fac32 | 503 | spin_lock_irq(&hwif->lock); |
295f0004 | 504 | |
5b31f855 | 505 | if (!ide_lock_port(hwif)) { |
42cf2611 | 506 | ide_hwif_t *prev_port; |
201bffa4 | 507 | repeat: |
bd53cbcc | 508 | prev_port = hwif->host->cur_port; |
b65fac32 | 509 | hwif->rq = NULL; |
2fb21150 | 510 | |
201bffa4 BZ |
511 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
512 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 513 | ide_unlock_port(hwif); |
201bffa4 BZ |
514 | goto plug_device; |
515 | } | |
516 | } | |
295f0004 | 517 | |
bd53cbcc BZ |
518 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
519 | hwif != prev_port) { | |
7299a391 | 520 | /* |
42cf2611 | 521 | * set nIEN for previous port, drives in the |
7299a391 BZ |
522 | * quirk_list may not like intr setups/cleanups |
523 | */ | |
b65fac32 | 524 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 525 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
526 | |
527 | hwif->host->cur_port = hwif; | |
1da177e4 | 528 | } |
b65fac32 | 529 | hwif->cur_dev = drive; |
4abdc6ee | 530 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 531 | |
b65fac32 | 532 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 533 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
534 | /* |
535 | * we know that the queue isn't empty, but this can happen | |
536 | * if the q->prep_rq_fn() decides to kill a request | |
537 | */ | |
538 | rq = elv_next_request(drive->queue); | |
201bffa4 | 539 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 540 | spin_lock_irq(&hwif->lock); |
201bffa4 | 541 | |
1da177e4 | 542 | if (!rq) { |
5b31f855 | 543 | ide_unlock_port(hwif); |
201bffa4 | 544 | goto out; |
1da177e4 LT |
545 | } |
546 | ||
547 | /* | |
548 | * Sanity: don't accept a request that isn't a PM request | |
549 | * if we are currently power managed. This is very important as | |
550 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
551 | * above to return us whatever is in the queue. Since we call | |
552 | * ide_do_request() ourselves, we end up taking requests while | |
553 | * the queue is blocked... | |
554 | * | |
555 | * We let requests forced at head of queue with ide-preempt | |
556 | * though. I hope that doesn't happen too much, hopefully not | |
557 | * unless the subdriver triggers such a thing in its own PM | |
558 | * state machine. | |
559 | */ | |
97100fc8 BZ |
560 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
561 | blk_pm_request(rq) == 0 && | |
562 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 563 | /* there should be no pending command at this point */ |
5b31f855 | 564 | ide_unlock_port(hwif); |
295f0004 | 565 | goto plug_device; |
1da177e4 LT |
566 | } |
567 | ||
b65fac32 | 568 | hwif->rq = rq; |
1da177e4 | 569 | |
b65fac32 | 570 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 571 | startstop = start_request(drive, rq); |
b65fac32 | 572 | spin_lock_irq(&hwif->lock); |
295f0004 | 573 | |
201bffa4 BZ |
574 | if (startstop == ide_stopped) |
575 | goto repeat; | |
576 | } else | |
577 | goto plug_device; | |
578 | out: | |
b65fac32 | 579 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
580 | if (rq == NULL) |
581 | ide_unlock_host(host); | |
201bffa4 | 582 | spin_lock_irq(q->queue_lock); |
295f0004 | 583 | return; |
1da177e4 | 584 | |
295f0004 | 585 | plug_device: |
b65fac32 | 586 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
587 | ide_unlock_host(host); |
588 | plug_device_2: | |
201bffa4 BZ |
589 | spin_lock_irq(q->queue_lock); |
590 | ||
591 | if (!elv_queue_empty(q)) | |
592 | blk_plug_device(q); | |
1da177e4 LT |
593 | } |
594 | ||
201bffa4 BZ |
595 | static void ide_plug_device(ide_drive_t *drive) |
596 | { | |
597 | struct request_queue *q = drive->queue; | |
598 | unsigned long flags; | |
599 | ||
600 | spin_lock_irqsave(q->queue_lock, flags); | |
601 | if (!elv_queue_empty(q)) | |
602 | blk_plug_device(q); | |
603 | spin_unlock_irqrestore(q->queue_lock, flags); | |
604 | } | |
605 | ||
b6a45a0b BZ |
606 | static int drive_is_ready(ide_drive_t *drive) |
607 | { | |
608 | ide_hwif_t *hwif = drive->hwif; | |
609 | u8 stat = 0; | |
610 | ||
611 | if (drive->waiting_for_dma) | |
612 | return hwif->dma_ops->dma_test_irq(drive); | |
613 | ||
614 | if (hwif->io_ports.ctl_addr && | |
615 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
616 | stat = hwif->tp_ops->read_altstatus(hwif); | |
617 | else | |
618 | /* Note: this may clear a pending IRQ!! */ | |
619 | stat = hwif->tp_ops->read_status(hwif); | |
620 | ||
621 | if (stat & ATA_BUSY) | |
622 | /* drive busy: definitely not interrupting */ | |
623 | return 0; | |
624 | ||
625 | /* drive ready: *might* be interrupting */ | |
626 | return 1; | |
627 | } | |
628 | ||
1da177e4 LT |
629 | /** |
630 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 631 | * @data: timer callback magic (hwif) |
1da177e4 LT |
632 | * |
633 | * An IDE command has timed out before the expected drive return | |
634 | * occurred. At this point we attempt to clean up the current | |
635 | * mess. If the current handler includes an expiry handler then | |
636 | * we invoke the expiry handler, and providing it is happy the | |
637 | * work is done. If that fails we apply generic recovery rules | |
638 | * invoking the handler and checking the drive DMA status. We | |
639 | * have an excessively incestuous relationship with the DMA | |
640 | * logic that wants cleaning up. | |
641 | */ | |
642 | ||
643 | void ide_timer_expiry (unsigned long data) | |
644 | { | |
b65fac32 | 645 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 646 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 647 | ide_handler_t *handler; |
1da177e4 | 648 | unsigned long flags; |
e0c6dcd8 | 649 | int wait = -1; |
201bffa4 | 650 | int plug_device = 0; |
1da177e4 | 651 | |
b65fac32 BZ |
652 | spin_lock_irqsave(&hwif->lock, flags); |
653 | ||
654 | handler = hwif->handler; | |
1da177e4 | 655 | |
b65fac32 | 656 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
657 | /* |
658 | * Either a marginal timeout occurred | |
659 | * (got the interrupt just as timer expired), | |
660 | * or we were "sleeping" to give other devices a chance. | |
661 | * Either way, we don't really want to complain about anything. | |
662 | */ | |
1da177e4 | 663 | } else { |
c38714ed BZ |
664 | ide_expiry_t *expiry = hwif->expiry; |
665 | ide_startstop_t startstop = ide_stopped; | |
666 | ||
b65fac32 | 667 | drive = hwif->cur_dev; |
c38714ed BZ |
668 | |
669 | if (expiry) { | |
670 | wait = expiry(drive); | |
671 | if (wait > 0) { /* continue */ | |
672 | /* reset timer */ | |
673 | hwif->timer.expires = jiffies + wait; | |
674 | hwif->req_gen_timer = hwif->req_gen; | |
675 | add_timer(&hwif->timer); | |
676 | spin_unlock_irqrestore(&hwif->lock, flags); | |
677 | return; | |
295f0004 | 678 | } |
1da177e4 | 679 | } |
c38714ed BZ |
680 | hwif->handler = NULL; |
681 | /* | |
682 | * We need to simulate a real interrupt when invoking | |
683 | * the handler() function, which means we need to | |
684 | * globally mask the specific IRQ: | |
685 | */ | |
686 | spin_unlock(&hwif->lock); | |
687 | /* disable_irq_nosync ?? */ | |
688 | disable_irq(hwif->irq); | |
689 | /* local CPU only, as if we were handling an interrupt */ | |
690 | local_irq_disable(); | |
691 | if (hwif->polling) { | |
692 | startstop = handler(drive); | |
693 | } else if (drive_is_ready(drive)) { | |
694 | if (drive->waiting_for_dma) | |
695 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
696 | if (hwif->ack_intr) |
697 | hwif->ack_intr(hwif); | |
c38714ed BZ |
698 | printk(KERN_WARNING "%s: lost interrupt\n", |
699 | drive->name); | |
700 | startstop = handler(drive); | |
701 | } else { | |
702 | if (drive->waiting_for_dma) | |
703 | startstop = ide_dma_timeout_retry(drive, wait); | |
704 | else | |
705 | startstop = ide_error(drive, "irq timeout", | |
706 | hwif->tp_ops->read_status(hwif)); | |
707 | } | |
708 | spin_lock_irq(&hwif->lock); | |
709 | enable_irq(hwif->irq); | |
710 | if (startstop == ide_stopped) { | |
711 | ide_unlock_port(hwif); | |
712 | plug_device = 1; | |
713 | } | |
1da177e4 | 714 | } |
b65fac32 | 715 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 716 | |
5b31f855 BZ |
717 | if (plug_device) { |
718 | ide_unlock_host(hwif->host); | |
201bffa4 | 719 | ide_plug_device(drive); |
5b31f855 | 720 | } |
1da177e4 LT |
721 | } |
722 | ||
723 | /** | |
724 | * unexpected_intr - handle an unexpected IDE interrupt | |
725 | * @irq: interrupt line | |
bd53cbcc | 726 | * @hwif: port being processed |
1da177e4 LT |
727 | * |
728 | * There's nothing really useful we can do with an unexpected interrupt, | |
729 | * other than reading the status register (to clear it), and logging it. | |
730 | * There should be no way that an irq can happen before we're ready for it, | |
731 | * so we needn't worry much about losing an "important" interrupt here. | |
732 | * | |
733 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
734 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
735 | * looks "good", we just ignore the interrupt completely. | |
736 | * | |
737 | * This routine assumes __cli() is in effect when called. | |
738 | * | |
739 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
740 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
741 | * we could screw up by interfering with a new request being set up for | |
742 | * irq15. | |
743 | * | |
744 | * In reality, this is a non-issue. The new command is not sent unless | |
745 | * the drive is ready to accept one, in which case we know the drive is | |
746 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
747 | * before completing the issuance of any new drive command, so we will not | |
748 | * be accidentally invoked as a result of any valid command completion | |
749 | * interrupt. | |
1da177e4 | 750 | */ |
bd53cbcc BZ |
751 | |
752 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 753 | { |
ae86afae BZ |
754 | u8 stat = hwif->tp_ops->read_status(hwif); |
755 | ||
756 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
757 | /* Try to not flood the console with msgs */ | |
758 | static unsigned long last_msgtime, count; | |
759 | ++count; | |
760 | ||
761 | if (time_after(jiffies, last_msgtime + HZ)) { | |
762 | last_msgtime = jiffies; | |
763 | printk(KERN_ERR "%s: unexpected interrupt, " | |
764 | "status=0x%02x, count=%ld\n", | |
765 | hwif->name, stat, count); | |
1da177e4 | 766 | } |
ae86afae | 767 | } |
1da177e4 LT |
768 | } |
769 | ||
770 | /** | |
771 | * ide_intr - default IDE interrupt handler | |
772 | * @irq: interrupt number | |
ae86afae | 773 | * @dev_id: hwif |
1da177e4 LT |
774 | * @regs: unused weirdness from the kernel irq layer |
775 | * | |
776 | * This is the default IRQ handler for the IDE layer. You should | |
777 | * not need to override it. If you do be aware it is subtle in | |
778 | * places | |
779 | * | |
bd53cbcc | 780 | * hwif is the interface in the group currently performing |
b65fac32 | 781 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
782 | * the IRQ handler to call. As we issue a command the handlers |
783 | * step through multiple states, reassigning the handler to the | |
784 | * next step in the process. Unlike a smart SCSI controller IDE | |
785 | * expects the main processor to sequence the various transfer | |
786 | * stages. We also manage a poll timer to catch up with most | |
787 | * timeout situations. There are still a few where the handlers | |
788 | * don't ever decide to give up. | |
789 | * | |
790 | * The handler eventually returns ide_stopped to indicate the | |
791 | * request completed. At this point we issue the next request | |
b65fac32 | 792 | * on the port and the process begins again. |
1da177e4 | 793 | */ |
b65fac32 | 794 | |
7d12e780 | 795 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 796 | { |
ae86afae | 797 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 798 | struct ide_host *host = hwif->host; |
201bffa4 | 799 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 800 | ide_handler_t *handler; |
ae86afae | 801 | unsigned long flags; |
1da177e4 | 802 | ide_startstop_t startstop; |
3e0e29f7 | 803 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 804 | int plug_device = 0; |
1da177e4 | 805 | |
255115fb BZ |
806 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
807 | if (hwif != host->cur_port) | |
ae86afae BZ |
808 | goto out_early; |
809 | } | |
bd53cbcc | 810 | |
b65fac32 | 811 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 812 | |
d15a613b | 813 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 814 | goto out; |
1da177e4 | 815 | |
b65fac32 BZ |
816 | handler = hwif->handler; |
817 | ||
818 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
819 | /* |
820 | * Not expecting an interrupt from this drive. | |
821 | * That means this could be: | |
822 | * (1) an interrupt from another PCI device | |
823 | * sharing the same PCI INT# as us. | |
824 | * or (2) a drive just entered sleep or standby mode, | |
825 | * and is interrupting to let us know. | |
826 | * or (3) a spurious interrupt of unknown origin. | |
827 | * | |
828 | * For PCI, we cannot tell the difference, | |
829 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 830 | */ |
255115fb | 831 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
832 | /* |
833 | * Probably not a shared PCI interrupt, | |
834 | * so we can safely try to do something about it: | |
835 | */ | |
bd53cbcc | 836 | unexpected_intr(irq, hwif); |
1da177e4 LT |
837 | } else { |
838 | /* | |
839 | * Whack the status register, just in case | |
840 | * we have a leftover pending IRQ. | |
841 | */ | |
374e042c | 842 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 843 | } |
3e0e29f7 | 844 | goto out; |
1da177e4 | 845 | } |
3e0e29f7 | 846 | |
b65fac32 | 847 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
848 | |
849 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
850 | /* |
851 | * This happens regularly when we share a PCI IRQ with | |
852 | * another device. Unfortunately, it can also happen | |
853 | * with some buggy drives that trigger the IRQ before | |
854 | * their status register is up to date. Hopefully we have | |
855 | * enough advance overhead that the latter isn't a problem. | |
856 | */ | |
3e0e29f7 BZ |
857 | goto out; |
858 | ||
b65fac32 BZ |
859 | hwif->handler = NULL; |
860 | hwif->req_gen++; | |
861 | del_timer(&hwif->timer); | |
862 | spin_unlock(&hwif->lock); | |
1da177e4 | 863 | |
bfa7d8e5 BZ |
864 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
865 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 866 | |
97100fc8 | 867 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 868 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 869 | |
1da177e4 LT |
870 | /* service this interrupt, may set handler for next interrupt */ |
871 | startstop = handler(drive); | |
1da177e4 | 872 | |
b65fac32 | 873 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
874 | /* |
875 | * Note that handler() may have set things up for another | |
876 | * interrupt to occur soon, but it cannot happen until | |
877 | * we exit from this routine, because it will be the | |
878 | * same irq as is currently being serviced here, and Linux | |
879 | * won't allow another of the same (on any CPU) until we return. | |
880 | */ | |
1da177e4 | 881 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
882 | BUG_ON(hwif->handler); |
883 | ide_unlock_port(hwif); | |
884 | plug_device = 1; | |
1da177e4 | 885 | } |
3e0e29f7 BZ |
886 | irq_ret = IRQ_HANDLED; |
887 | out: | |
b65fac32 | 888 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 889 | out_early: |
5b31f855 BZ |
890 | if (plug_device) { |
891 | ide_unlock_host(hwif->host); | |
201bffa4 | 892 | ide_plug_device(drive); |
5b31f855 | 893 | } |
201bffa4 | 894 | |
3e0e29f7 | 895 | return irq_ret; |
1da177e4 | 896 | } |
849d7130 | 897 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 898 | |
9f87abe8 BZ |
899 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
900 | { | |
901 | ide_hwif_t *hwif = drive->hwif; | |
902 | u8 buf[4] = { 0 }; | |
903 | ||
904 | while (len > 0) { | |
905 | if (write) | |
374e042c | 906 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 907 | else |
374e042c | 908 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
909 | len -= 4; |
910 | } | |
911 | } | |
912 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |