Commit | Line | Data |
---|---|---|
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 | 73 | |
22aa4b32 | 74 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 75 | { |
22aa4b32 BZ |
76 | struct ide_taskfile *tf = &cmd->tf; |
77 | struct request *rq = cmd->rq; | |
e7fedc3c | 78 | u8 tf_cmd = tf->command; |
e120237c BZ |
79 | |
80 | tf->error = err; | |
81 | tf->status = stat; | |
82 | ||
22aa4b32 | 83 | drive->hwif->tp_ops->tf_read(drive, cmd); |
e120237c | 84 | |
e7fedc3c BZ |
85 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
86 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { | |
87 | if (tf->lbal != 0xc4) { | |
88 | printk(KERN_ERR "%s: head unload failed!\n", | |
89 | drive->name); | |
90 | ide_tf_dump(drive->name, tf); | |
91 | } else | |
92 | drive->dev_flags |= IDE_DFLAG_PARKED; | |
93 | } | |
94 | ||
a09485df | 95 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
22aa4b32 | 96 | memcpy(rq->special, cmd, sizeof(*cmd)); |
a09485df | 97 | |
22aa4b32 BZ |
98 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
99 | kfree(cmd); | |
e120237c BZ |
100 | } |
101 | ||
130e8867 BZ |
102 | /* obsolete, blk_rq_bytes() should be used instead */ |
103 | unsigned int ide_rq_bytes(struct request *rq) | |
104 | { | |
105 | if (blk_pc_request(rq)) | |
106 | return rq->data_len; | |
107 | else | |
108 | return rq->hard_cur_sectors << 9; | |
109 | } | |
110 | EXPORT_SYMBOL_GPL(ide_rq_bytes); | |
111 | ||
f974b196 | 112 | int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes) |
1da177e4 | 113 | { |
b65fac32 BZ |
114 | ide_hwif_t *hwif = drive->hwif; |
115 | struct request *rq = hwif->rq; | |
a9587fd8 | 116 | int rc; |
1da177e4 | 117 | |
130e8867 BZ |
118 | /* |
119 | * if failfast is set on a request, override number of sectors | |
120 | * and complete the whole request right now | |
121 | */ | |
122 | if (blk_noretry_request(rq) && error <= 0) | |
123 | nr_bytes = rq->hard_nr_sectors << 9; | |
124 | ||
ba7d479c | 125 | rc = ide_end_rq(drive, rq, error, nr_bytes); |
a9587fd8 BZ |
126 | if (rc == 0) |
127 | hwif->rq = NULL; | |
1d0bf587 | 128 | |
a9587fd8 | 129 | return rc; |
1da177e4 | 130 | } |
a09485df | 131 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 132 | |
327fa1c2 | 133 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 134 | { |
3ee38302 BZ |
135 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
136 | u8 media = drive->media; | |
137 | ||
c152cc1a BZ |
138 | drive->failed_pc = NULL; |
139 | ||
6902a533 BZ |
140 | if ((media == ide_floppy || media == ide_tape) && drv_req) { |
141 | rq->errors = 0; | |
f974b196 | 142 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
6902a533 BZ |
143 | } else { |
144 | if (media == ide_tape) | |
145 | rq->errors = IDE_DRV_ERROR_GENERAL; | |
89f78b32 BZ |
146 | else if (blk_fs_request(rq) == 0 && rq->errors == 0) |
147 | rq->errors = -EIO; | |
130e8867 | 148 | ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); |
6902a533 | 149 | } |
1da177e4 LT |
150 | } |
151 | ||
57d7366b | 152 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 153 | { |
57d7366b BZ |
154 | tf->nsect = drive->sect; |
155 | tf->lbal = drive->sect; | |
156 | tf->lbam = drive->cyl; | |
157 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 158 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 159 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
160 | } |
161 | ||
57d7366b | 162 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 163 | { |
57d7366b | 164 | tf->nsect = drive->sect; |
aaaade3f | 165 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
166 | } |
167 | ||
57d7366b | 168 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 169 | { |
57d7366b | 170 | tf->nsect = drive->mult_req; |
aaaade3f | 171 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
172 | } |
173 | ||
174 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
175 | { | |
176 | special_t *s = &drive->special; | |
22aa4b32 | 177 | struct ide_cmd cmd; |
1da177e4 | 178 | |
22aa4b32 | 179 | memset(&cmd, 0, sizeof(cmd)); |
0dfb991c | 180 | cmd.protocol = ATA_PROT_NODATA; |
1da177e4 LT |
181 | |
182 | if (s->b.set_geometry) { | |
183 | s->b.set_geometry = 0; | |
22aa4b32 | 184 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
1da177e4 LT |
185 | } else if (s->b.recalibrate) { |
186 | s->b.recalibrate = 0; | |
22aa4b32 | 187 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
1da177e4 LT |
188 | } else if (s->b.set_multmode) { |
189 | s->b.set_multmode = 0; | |
22aa4b32 | 190 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
1da177e4 LT |
191 | } else if (s->all) { |
192 | int special = s->all; | |
193 | s->all = 0; | |
194 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
195 | return ide_stopped; | |
196 | } | |
197 | ||
22aa4b32 BZ |
198 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
199 | IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 200 | |
22aa4b32 | 201 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
202 | |
203 | return ide_started; | |
204 | } | |
205 | ||
206 | /** | |
207 | * do_special - issue some special commands | |
208 | * @drive: drive the command is for | |
209 | * | |
aaaade3f BZ |
210 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
211 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
212 | * | |
213 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
214 | */ |
215 | ||
216 | static ide_startstop_t do_special (ide_drive_t *drive) | |
217 | { | |
218 | special_t *s = &drive->special; | |
219 | ||
220 | #ifdef DEBUG | |
221 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
222 | #endif | |
6982daf7 BZ |
223 | if (drive->media == ide_disk) |
224 | return ide_disk_special(drive); | |
1da177e4 | 225 | |
6982daf7 BZ |
226 | s->all = 0; |
227 | drive->mult_req = 0; | |
228 | return ide_stopped; | |
1da177e4 LT |
229 | } |
230 | ||
22981694 | 231 | void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
1da177e4 LT |
232 | { |
233 | ide_hwif_t *hwif = drive->hwif; | |
234 | struct scatterlist *sg = hwif->sg_table; | |
22981694 | 235 | struct request *rq = cmd->rq; |
1da177e4 | 236 | |
9e772d01 | 237 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 | 238 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
b6308ee0 | 239 | cmd->sg_nents = 1; |
9e772d01 BP |
240 | } else if (!rq->bio) { |
241 | sg_init_one(sg, rq->data, rq->data_len); | |
b6308ee0 BZ |
242 | cmd->sg_nents = 1; |
243 | } else | |
244 | cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 | 245 | } |
1da177e4 LT |
246 | EXPORT_SYMBOL_GPL(ide_map_sg); |
247 | ||
bf717c0a | 248 | void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes) |
1da177e4 | 249 | { |
bf717c0a | 250 | cmd->nbytes = cmd->nleft = nr_bytes; |
b6308ee0 BZ |
251 | cmd->cursg_ofs = 0; |
252 | cmd->cursg = NULL; | |
1da177e4 | 253 | } |
1da177e4 LT |
254 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
255 | ||
256 | /** | |
257 | * execute_drive_command - issue special drive command | |
338cec32 | 258 | * @drive: the drive to issue the command on |
1da177e4 LT |
259 | * @rq: the request structure holding the command |
260 | * | |
261 | * execute_drive_cmd() issues a special drive command, usually | |
262 | * initiated by ioctl() from the external hdparm program. The | |
263 | * command can be a drive command, drive task or taskfile | |
264 | * operation. Weirdly you can call it with NULL to wait for | |
265 | * all commands to finish. Don't do this as that is due to change | |
266 | */ | |
267 | ||
268 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
269 | struct request *rq) | |
270 | { | |
22aa4b32 | 271 | struct ide_cmd *cmd = rq->special; |
1da177e4 | 272 | |
22aa4b32 | 273 | if (cmd) { |
0dfb991c | 274 | if (cmd->protocol == ATA_PROT_PIO) { |
bf717c0a | 275 | ide_init_sg_cmd(cmd, rq->nr_sectors << 9); |
22981694 | 276 | ide_map_sg(drive, cmd); |
1da177e4 | 277 | } |
74095a91 | 278 | |
22aa4b32 | 279 | return do_rw_taskfile(drive, cmd); |
21d535c9 BZ |
280 | } |
281 | ||
1da177e4 LT |
282 | /* |
283 | * NULL is actually a valid way of waiting for | |
284 | * all current requests to be flushed from the queue. | |
285 | */ | |
286 | #ifdef DEBUG | |
287 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
288 | #endif | |
6902a533 | 289 | rq->errors = 0; |
f974b196 | 290 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
64a57fe4 | 291 | |
1da177e4 | 292 | return ide_stopped; |
1bc6daae BZ |
293 | } |
294 | ||
79e36a9f EO |
295 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
296 | { | |
4abdc6ee EO |
297 | u8 cmd = rq->cmd[0]; |
298 | ||
4abdc6ee | 299 | switch (cmd) { |
1bc6daae BZ |
300 | case REQ_PARK_HEADS: |
301 | case REQ_UNPARK_HEADS: | |
302 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 303 | case REQ_DEVSET_EXEC: |
1bc6daae | 304 | return ide_do_devset(drive, rq); |
79e36a9f EO |
305 | case REQ_DRIVE_RESET: |
306 | return ide_do_reset(drive); | |
307 | default: | |
1713788f | 308 | BUG(); |
79e36a9f EO |
309 | } |
310 | } | |
311 | ||
1da177e4 LT |
312 | /** |
313 | * start_request - start of I/O and command issuing for IDE | |
314 | * | |
315 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 316 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
317 | * |
318 | * FIXME: this function needs a rename | |
319 | */ | |
320 | ||
321 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
322 | { | |
323 | ide_startstop_t startstop; | |
1da177e4 | 324 | |
4aff5e23 | 325 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
326 | |
327 | #ifdef DEBUG | |
328 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 329 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
330 | #endif |
331 | ||
332 | /* bail early if we've exceeded max_failures */ | |
333 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 334 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
335 | goto kill_rq; |
336 | } | |
337 | ||
ad3cadda JA |
338 | if (blk_pm_request(rq)) |
339 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
340 | |
341 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
342 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
343 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
344 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
345 | return startstop; | |
346 | } | |
347 | if (!drive->special.all) { | |
7f3c868b | 348 | struct ide_driver *drv; |
1da177e4 | 349 | |
513daadd SS |
350 | /* |
351 | * We reset the drive so we need to issue a SETFEATURES. | |
352 | * Do it _after_ do_special() restored device parameters. | |
353 | */ | |
354 | if (drive->current_speed == 0xff) | |
355 | ide_config_drive_speed(drive, drive->desired_speed); | |
356 | ||
7267c337 | 357 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
358 | return execute_drive_cmd(drive, rq); |
359 | else if (blk_pm_request(rq)) { | |
c00895ab | 360 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
361 | #ifdef DEBUG_PM |
362 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 363 | drive->name, pm->pm_step); |
1da177e4 LT |
364 | #endif |
365 | startstop = ide_start_power_step(drive, rq); | |
366 | if (startstop == ide_stopped && | |
0d346ba0 | 367 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 368 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 369 | return startstop; |
79e36a9f EO |
370 | } else if (!rq->rq_disk && blk_special_request(rq)) |
371 | /* | |
372 | * TODO: Once all ULDs have been modified to | |
373 | * check for specific op codes rather than | |
374 | * blindly accepting any special request, the | |
375 | * check for ->rq_disk above may be replaced | |
376 | * by a more suitable mechanism or even | |
377 | * dropped entirely. | |
378 | */ | |
379 | return ide_special_rq(drive, rq); | |
1da177e4 | 380 | |
7f3c868b | 381 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
382 | |
383 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
384 | } |
385 | return do_special(drive); | |
386 | kill_rq: | |
387 | ide_kill_rq(drive, rq); | |
388 | return ide_stopped; | |
389 | } | |
390 | ||
391 | /** | |
392 | * ide_stall_queue - pause an IDE device | |
393 | * @drive: drive to stall | |
394 | * @timeout: time to stall for (jiffies) | |
395 | * | |
396 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 397 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
398 | */ |
399 | ||
400 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
401 | { | |
402 | if (timeout > WAIT_WORSTCASE) | |
403 | timeout = WAIT_WORSTCASE; | |
404 | drive->sleep = timeout + jiffies; | |
97100fc8 | 405 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 406 | } |
1da177e4 LT |
407 | EXPORT_SYMBOL(ide_stall_queue); |
408 | ||
5b31f855 BZ |
409 | static inline int ide_lock_port(ide_hwif_t *hwif) |
410 | { | |
411 | if (hwif->busy) | |
412 | return 1; | |
413 | ||
414 | hwif->busy = 1; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
420 | { | |
421 | hwif->busy = 0; | |
422 | } | |
423 | ||
424 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
425 | { | |
426 | int rc = 0; | |
427 | ||
428 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
429 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
430 | if (rc == 0) { | |
e354c1d8 BZ |
431 | if (host->get_lock) |
432 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
433 | } |
434 | } | |
435 | return rc; | |
436 | } | |
437 | ||
438 | static inline void ide_unlock_host(struct ide_host *host) | |
439 | { | |
440 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
441 | if (host->release_lock) |
442 | host->release_lock(); | |
5b31f855 BZ |
443 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
444 | } | |
445 | } | |
446 | ||
1da177e4 | 447 | /* |
b65fac32 | 448 | * Issue a new request to a device. |
1da177e4 | 449 | */ |
295f0004 | 450 | void do_ide_request(struct request_queue *q) |
1da177e4 | 451 | { |
201bffa4 BZ |
452 | ide_drive_t *drive = q->queuedata; |
453 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 454 | struct ide_host *host = hwif->host; |
5b31f855 | 455 | struct request *rq = NULL; |
1da177e4 LT |
456 | ide_startstop_t startstop; |
457 | ||
201bffa4 BZ |
458 | /* |
459 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
460 | * though that is 3 requests, it must be seen as a single transaction. | |
461 | * we must not preempt this drive until that is complete | |
462 | */ | |
463 | if (blk_queue_flushing(q)) | |
1da177e4 | 464 | /* |
201bffa4 BZ |
465 | * small race where queue could get replugged during |
466 | * the 3-request flush cycle, just yank the plug since | |
467 | * we want it to finish asap | |
1da177e4 | 468 | */ |
201bffa4 | 469 | blk_remove_plug(q); |
1da177e4 | 470 | |
201bffa4 | 471 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
472 | |
473 | if (ide_lock_host(host, hwif)) | |
474 | goto plug_device_2; | |
475 | ||
b65fac32 | 476 | spin_lock_irq(&hwif->lock); |
295f0004 | 477 | |
5b31f855 | 478 | if (!ide_lock_port(hwif)) { |
42cf2611 | 479 | ide_hwif_t *prev_port; |
201bffa4 | 480 | repeat: |
bd53cbcc | 481 | prev_port = hwif->host->cur_port; |
b65fac32 | 482 | hwif->rq = NULL; |
2fb21150 | 483 | |
9010941c EO |
484 | if (drive->dev_flags & IDE_DFLAG_SLEEPING && |
485 | time_after(drive->sleep, jiffies)) { | |
486 | ide_unlock_port(hwif); | |
487 | goto plug_device; | |
201bffa4 | 488 | } |
295f0004 | 489 | |
bd53cbcc BZ |
490 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
491 | hwif != prev_port) { | |
7299a391 | 492 | /* |
42cf2611 | 493 | * set nIEN for previous port, drives in the |
7299a391 BZ |
494 | * quirk_list may not like intr setups/cleanups |
495 | */ | |
b65fac32 | 496 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 497 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
498 | |
499 | hwif->host->cur_port = hwif; | |
1da177e4 | 500 | } |
b65fac32 | 501 | hwif->cur_dev = drive; |
4abdc6ee | 502 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 503 | |
b65fac32 | 504 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 505 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
506 | /* |
507 | * we know that the queue isn't empty, but this can happen | |
508 | * if the q->prep_rq_fn() decides to kill a request | |
509 | */ | |
510 | rq = elv_next_request(drive->queue); | |
201bffa4 | 511 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 512 | spin_lock_irq(&hwif->lock); |
201bffa4 | 513 | |
1da177e4 | 514 | if (!rq) { |
5b31f855 | 515 | ide_unlock_port(hwif); |
201bffa4 | 516 | goto out; |
1da177e4 LT |
517 | } |
518 | ||
519 | /* | |
520 | * Sanity: don't accept a request that isn't a PM request | |
521 | * if we are currently power managed. This is very important as | |
522 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
523 | * above to return us whatever is in the queue. Since we call | |
524 | * ide_do_request() ourselves, we end up taking requests while | |
525 | * the queue is blocked... | |
526 | * | |
527 | * We let requests forced at head of queue with ide-preempt | |
528 | * though. I hope that doesn't happen too much, hopefully not | |
529 | * unless the subdriver triggers such a thing in its own PM | |
530 | * state machine. | |
531 | */ | |
97100fc8 BZ |
532 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
533 | blk_pm_request(rq) == 0 && | |
534 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 535 | /* there should be no pending command at this point */ |
5b31f855 | 536 | ide_unlock_port(hwif); |
295f0004 | 537 | goto plug_device; |
1da177e4 LT |
538 | } |
539 | ||
b65fac32 | 540 | hwif->rq = rq; |
1da177e4 | 541 | |
b65fac32 | 542 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 543 | startstop = start_request(drive, rq); |
b65fac32 | 544 | spin_lock_irq(&hwif->lock); |
295f0004 | 545 | |
201bffa4 BZ |
546 | if (startstop == ide_stopped) |
547 | goto repeat; | |
548 | } else | |
549 | goto plug_device; | |
550 | out: | |
b65fac32 | 551 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
552 | if (rq == NULL) |
553 | ide_unlock_host(host); | |
201bffa4 | 554 | spin_lock_irq(q->queue_lock); |
295f0004 | 555 | return; |
1da177e4 | 556 | |
295f0004 | 557 | plug_device: |
b65fac32 | 558 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
559 | ide_unlock_host(host); |
560 | plug_device_2: | |
201bffa4 BZ |
561 | spin_lock_irq(q->queue_lock); |
562 | ||
563 | if (!elv_queue_empty(q)) | |
564 | blk_plug_device(q); | |
1da177e4 LT |
565 | } |
566 | ||
201bffa4 BZ |
567 | static void ide_plug_device(ide_drive_t *drive) |
568 | { | |
569 | struct request_queue *q = drive->queue; | |
570 | unsigned long flags; | |
571 | ||
572 | spin_lock_irqsave(q->queue_lock, flags); | |
573 | if (!elv_queue_empty(q)) | |
574 | blk_plug_device(q); | |
575 | spin_unlock_irqrestore(q->queue_lock, flags); | |
576 | } | |
577 | ||
b6a45a0b BZ |
578 | static int drive_is_ready(ide_drive_t *drive) |
579 | { | |
580 | ide_hwif_t *hwif = drive->hwif; | |
581 | u8 stat = 0; | |
582 | ||
583 | if (drive->waiting_for_dma) | |
584 | return hwif->dma_ops->dma_test_irq(drive); | |
585 | ||
586 | if (hwif->io_ports.ctl_addr && | |
587 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
588 | stat = hwif->tp_ops->read_altstatus(hwif); | |
589 | else | |
590 | /* Note: this may clear a pending IRQ!! */ | |
591 | stat = hwif->tp_ops->read_status(hwif); | |
592 | ||
593 | if (stat & ATA_BUSY) | |
594 | /* drive busy: definitely not interrupting */ | |
595 | return 0; | |
596 | ||
597 | /* drive ready: *might* be interrupting */ | |
598 | return 1; | |
599 | } | |
600 | ||
1da177e4 LT |
601 | /** |
602 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 603 | * @data: timer callback magic (hwif) |
1da177e4 LT |
604 | * |
605 | * An IDE command has timed out before the expected drive return | |
606 | * occurred. At this point we attempt to clean up the current | |
607 | * mess. If the current handler includes an expiry handler then | |
608 | * we invoke the expiry handler, and providing it is happy the | |
609 | * work is done. If that fails we apply generic recovery rules | |
610 | * invoking the handler and checking the drive DMA status. We | |
611 | * have an excessively incestuous relationship with the DMA | |
612 | * logic that wants cleaning up. | |
613 | */ | |
614 | ||
615 | void ide_timer_expiry (unsigned long data) | |
616 | { | |
b65fac32 | 617 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 618 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 619 | ide_handler_t *handler; |
1da177e4 | 620 | unsigned long flags; |
e0c6dcd8 | 621 | int wait = -1; |
201bffa4 | 622 | int plug_device = 0; |
1da177e4 | 623 | |
b65fac32 BZ |
624 | spin_lock_irqsave(&hwif->lock, flags); |
625 | ||
626 | handler = hwif->handler; | |
1da177e4 | 627 | |
b65fac32 | 628 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
629 | /* |
630 | * Either a marginal timeout occurred | |
631 | * (got the interrupt just as timer expired), | |
632 | * or we were "sleeping" to give other devices a chance. | |
633 | * Either way, we don't really want to complain about anything. | |
634 | */ | |
1da177e4 | 635 | } else { |
c38714ed BZ |
636 | ide_expiry_t *expiry = hwif->expiry; |
637 | ide_startstop_t startstop = ide_stopped; | |
638 | ||
b65fac32 | 639 | drive = hwif->cur_dev; |
c38714ed BZ |
640 | |
641 | if (expiry) { | |
642 | wait = expiry(drive); | |
643 | if (wait > 0) { /* continue */ | |
644 | /* reset timer */ | |
645 | hwif->timer.expires = jiffies + wait; | |
646 | hwif->req_gen_timer = hwif->req_gen; | |
647 | add_timer(&hwif->timer); | |
648 | spin_unlock_irqrestore(&hwif->lock, flags); | |
649 | return; | |
295f0004 | 650 | } |
1da177e4 | 651 | } |
c38714ed | 652 | hwif->handler = NULL; |
60c0cd02 | 653 | hwif->expiry = NULL; |
c38714ed BZ |
654 | /* |
655 | * We need to simulate a real interrupt when invoking | |
656 | * the handler() function, which means we need to | |
657 | * globally mask the specific IRQ: | |
658 | */ | |
659 | spin_unlock(&hwif->lock); | |
660 | /* disable_irq_nosync ?? */ | |
661 | disable_irq(hwif->irq); | |
662 | /* local CPU only, as if we were handling an interrupt */ | |
663 | local_irq_disable(); | |
664 | if (hwif->polling) { | |
665 | startstop = handler(drive); | |
666 | } else if (drive_is_ready(drive)) { | |
667 | if (drive->waiting_for_dma) | |
668 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
669 | if (hwif->ack_intr) |
670 | hwif->ack_intr(hwif); | |
c38714ed BZ |
671 | printk(KERN_WARNING "%s: lost interrupt\n", |
672 | drive->name); | |
673 | startstop = handler(drive); | |
674 | } else { | |
675 | if (drive->waiting_for_dma) | |
676 | startstop = ide_dma_timeout_retry(drive, wait); | |
677 | else | |
678 | startstop = ide_error(drive, "irq timeout", | |
679 | hwif->tp_ops->read_status(hwif)); | |
680 | } | |
681 | spin_lock_irq(&hwif->lock); | |
682 | enable_irq(hwif->irq); | |
683 | if (startstop == ide_stopped) { | |
684 | ide_unlock_port(hwif); | |
685 | plug_device = 1; | |
686 | } | |
1da177e4 | 687 | } |
b65fac32 | 688 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 689 | |
5b31f855 BZ |
690 | if (plug_device) { |
691 | ide_unlock_host(hwif->host); | |
201bffa4 | 692 | ide_plug_device(drive); |
5b31f855 | 693 | } |
1da177e4 LT |
694 | } |
695 | ||
696 | /** | |
697 | * unexpected_intr - handle an unexpected IDE interrupt | |
698 | * @irq: interrupt line | |
bd53cbcc | 699 | * @hwif: port being processed |
1da177e4 LT |
700 | * |
701 | * There's nothing really useful we can do with an unexpected interrupt, | |
702 | * other than reading the status register (to clear it), and logging it. | |
703 | * There should be no way that an irq can happen before we're ready for it, | |
704 | * so we needn't worry much about losing an "important" interrupt here. | |
705 | * | |
706 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
707 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
708 | * looks "good", we just ignore the interrupt completely. | |
709 | * | |
710 | * This routine assumes __cli() is in effect when called. | |
711 | * | |
712 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
713 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
714 | * we could screw up by interfering with a new request being set up for | |
715 | * irq15. | |
716 | * | |
717 | * In reality, this is a non-issue. The new command is not sent unless | |
718 | * the drive is ready to accept one, in which case we know the drive is | |
719 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
720 | * before completing the issuance of any new drive command, so we will not | |
721 | * be accidentally invoked as a result of any valid command completion | |
722 | * interrupt. | |
1da177e4 | 723 | */ |
bd53cbcc BZ |
724 | |
725 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 726 | { |
ae86afae BZ |
727 | u8 stat = hwif->tp_ops->read_status(hwif); |
728 | ||
729 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
730 | /* Try to not flood the console with msgs */ | |
731 | static unsigned long last_msgtime, count; | |
732 | ++count; | |
733 | ||
734 | if (time_after(jiffies, last_msgtime + HZ)) { | |
735 | last_msgtime = jiffies; | |
736 | printk(KERN_ERR "%s: unexpected interrupt, " | |
737 | "status=0x%02x, count=%ld\n", | |
738 | hwif->name, stat, count); | |
1da177e4 | 739 | } |
ae86afae | 740 | } |
1da177e4 LT |
741 | } |
742 | ||
743 | /** | |
744 | * ide_intr - default IDE interrupt handler | |
745 | * @irq: interrupt number | |
ae86afae | 746 | * @dev_id: hwif |
1da177e4 LT |
747 | * @regs: unused weirdness from the kernel irq layer |
748 | * | |
749 | * This is the default IRQ handler for the IDE layer. You should | |
750 | * not need to override it. If you do be aware it is subtle in | |
751 | * places | |
752 | * | |
bd53cbcc | 753 | * hwif is the interface in the group currently performing |
b65fac32 | 754 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
755 | * the IRQ handler to call. As we issue a command the handlers |
756 | * step through multiple states, reassigning the handler to the | |
757 | * next step in the process. Unlike a smart SCSI controller IDE | |
758 | * expects the main processor to sequence the various transfer | |
759 | * stages. We also manage a poll timer to catch up with most | |
760 | * timeout situations. There are still a few where the handlers | |
761 | * don't ever decide to give up. | |
762 | * | |
763 | * The handler eventually returns ide_stopped to indicate the | |
764 | * request completed. At this point we issue the next request | |
b65fac32 | 765 | * on the port and the process begins again. |
1da177e4 | 766 | */ |
b65fac32 | 767 | |
7d12e780 | 768 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 769 | { |
ae86afae | 770 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 771 | struct ide_host *host = hwif->host; |
201bffa4 | 772 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 773 | ide_handler_t *handler; |
ae86afae | 774 | unsigned long flags; |
1da177e4 | 775 | ide_startstop_t startstop; |
3e0e29f7 | 776 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 777 | int plug_device = 0; |
1da177e4 | 778 | |
255115fb BZ |
779 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
780 | if (hwif != host->cur_port) | |
ae86afae BZ |
781 | goto out_early; |
782 | } | |
bd53cbcc | 783 | |
b65fac32 | 784 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 785 | |
d15a613b | 786 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 787 | goto out; |
1da177e4 | 788 | |
b65fac32 BZ |
789 | handler = hwif->handler; |
790 | ||
791 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
792 | /* |
793 | * Not expecting an interrupt from this drive. | |
794 | * That means this could be: | |
795 | * (1) an interrupt from another PCI device | |
796 | * sharing the same PCI INT# as us. | |
797 | * or (2) a drive just entered sleep or standby mode, | |
798 | * and is interrupting to let us know. | |
799 | * or (3) a spurious interrupt of unknown origin. | |
800 | * | |
801 | * For PCI, we cannot tell the difference, | |
802 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 803 | */ |
255115fb | 804 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
805 | /* |
806 | * Probably not a shared PCI interrupt, | |
807 | * so we can safely try to do something about it: | |
808 | */ | |
bd53cbcc | 809 | unexpected_intr(irq, hwif); |
1da177e4 LT |
810 | } else { |
811 | /* | |
812 | * Whack the status register, just in case | |
813 | * we have a leftover pending IRQ. | |
814 | */ | |
374e042c | 815 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 816 | } |
3e0e29f7 | 817 | goto out; |
1da177e4 | 818 | } |
3e0e29f7 | 819 | |
b65fac32 | 820 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
821 | |
822 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
823 | /* |
824 | * This happens regularly when we share a PCI IRQ with | |
825 | * another device. Unfortunately, it can also happen | |
826 | * with some buggy drives that trigger the IRQ before | |
827 | * their status register is up to date. Hopefully we have | |
828 | * enough advance overhead that the latter isn't a problem. | |
829 | */ | |
3e0e29f7 BZ |
830 | goto out; |
831 | ||
b65fac32 | 832 | hwif->handler = NULL; |
60c0cd02 | 833 | hwif->expiry = NULL; |
b65fac32 BZ |
834 | hwif->req_gen++; |
835 | del_timer(&hwif->timer); | |
836 | spin_unlock(&hwif->lock); | |
1da177e4 | 837 | |
bfa7d8e5 BZ |
838 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
839 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 840 | |
97100fc8 | 841 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 842 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 843 | |
1da177e4 LT |
844 | /* service this interrupt, may set handler for next interrupt */ |
845 | startstop = handler(drive); | |
1da177e4 | 846 | |
b65fac32 | 847 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
848 | /* |
849 | * Note that handler() may have set things up for another | |
850 | * interrupt to occur soon, but it cannot happen until | |
851 | * we exit from this routine, because it will be the | |
852 | * same irq as is currently being serviced here, and Linux | |
853 | * won't allow another of the same (on any CPU) until we return. | |
854 | */ | |
1da177e4 | 855 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
856 | BUG_ON(hwif->handler); |
857 | ide_unlock_port(hwif); | |
858 | plug_device = 1; | |
1da177e4 | 859 | } |
3e0e29f7 BZ |
860 | irq_ret = IRQ_HANDLED; |
861 | out: | |
b65fac32 | 862 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 863 | out_early: |
5b31f855 BZ |
864 | if (plug_device) { |
865 | ide_unlock_host(hwif->host); | |
201bffa4 | 866 | ide_plug_device(drive); |
5b31f855 | 867 | } |
201bffa4 | 868 | |
3e0e29f7 | 869 | return irq_ret; |
1da177e4 | 870 | } |
849d7130 | 871 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 872 | |
9f87abe8 BZ |
873 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
874 | { | |
875 | ide_hwif_t *hwif = drive->hwif; | |
876 | u8 buf[4] = { 0 }; | |
877 | ||
878 | while (len > 0) { | |
879 | if (write) | |
374e042c | 880 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 881 | else |
374e042c | 882 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
883 | len -= 4; |
884 | } | |
885 | } | |
886 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |