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 | 73 | |
22aa4b32 | 74 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 75 | { |
35218d1c | 76 | const struct ide_tp_ops *tp_ops = drive->hwif->tp_ops; |
22aa4b32 BZ |
77 | struct ide_taskfile *tf = &cmd->tf; |
78 | struct request *rq = cmd->rq; | |
e7fedc3c | 79 | u8 tf_cmd = tf->command; |
e120237c BZ |
80 | |
81 | tf->error = err; | |
82 | tf->status = stat; | |
83 | ||
35218d1c SS |
84 | if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) { |
85 | u8 data[2]; | |
86 | ||
87 | tp_ops->input_data(drive, cmd, data, 2); | |
88 | ||
89 | tf->data = data[0]; | |
90 | tf->hob_data = data[1]; | |
91 | } | |
92 | ||
93 | tp_ops->tf_read(drive, cmd); | |
e120237c | 94 | |
e7fedc3c BZ |
95 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
96 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { | |
97 | if (tf->lbal != 0xc4) { | |
98 | printk(KERN_ERR "%s: head unload failed!\n", | |
99 | drive->name); | |
100 | ide_tf_dump(drive->name, tf); | |
101 | } else | |
102 | drive->dev_flags |= IDE_DFLAG_PARKED; | |
103 | } | |
104 | ||
a09485df | 105 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
22aa4b32 | 106 | memcpy(rq->special, cmd, sizeof(*cmd)); |
a09485df | 107 | |
22aa4b32 BZ |
108 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
109 | kfree(cmd); | |
e120237c BZ |
110 | } |
111 | ||
130e8867 BZ |
112 | /* obsolete, blk_rq_bytes() should be used instead */ |
113 | unsigned int ide_rq_bytes(struct request *rq) | |
114 | { | |
115 | if (blk_pc_request(rq)) | |
116 | return rq->data_len; | |
117 | else | |
118 | return rq->hard_cur_sectors << 9; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(ide_rq_bytes); | |
121 | ||
f974b196 | 122 | int ide_complete_rq(ide_drive_t *drive, int error, unsigned int nr_bytes) |
1da177e4 | 123 | { |
b65fac32 BZ |
124 | ide_hwif_t *hwif = drive->hwif; |
125 | struct request *rq = hwif->rq; | |
a9587fd8 | 126 | int rc; |
1da177e4 | 127 | |
130e8867 BZ |
128 | /* |
129 | * if failfast is set on a request, override number of sectors | |
130 | * and complete the whole request right now | |
131 | */ | |
132 | if (blk_noretry_request(rq) && error <= 0) | |
133 | nr_bytes = rq->hard_nr_sectors << 9; | |
134 | ||
ba7d479c | 135 | rc = ide_end_rq(drive, rq, error, nr_bytes); |
a9587fd8 BZ |
136 | if (rc == 0) |
137 | hwif->rq = NULL; | |
1d0bf587 | 138 | |
a9587fd8 | 139 | return rc; |
1da177e4 | 140 | } |
a09485df | 141 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 142 | |
327fa1c2 | 143 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 144 | { |
3ee38302 BZ |
145 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
146 | u8 media = drive->media; | |
147 | ||
c152cc1a BZ |
148 | drive->failed_pc = NULL; |
149 | ||
6902a533 BZ |
150 | if ((media == ide_floppy || media == ide_tape) && drv_req) { |
151 | rq->errors = 0; | |
f974b196 | 152 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
6902a533 BZ |
153 | } else { |
154 | if (media == ide_tape) | |
155 | rq->errors = IDE_DRV_ERROR_GENERAL; | |
89f78b32 BZ |
156 | else if (blk_fs_request(rq) == 0 && rq->errors == 0) |
157 | rq->errors = -EIO; | |
130e8867 | 158 | ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); |
6902a533 | 159 | } |
1da177e4 LT |
160 | } |
161 | ||
57d7366b | 162 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 163 | { |
57d7366b BZ |
164 | tf->nsect = drive->sect; |
165 | tf->lbal = drive->sect; | |
166 | tf->lbam = drive->cyl; | |
167 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 168 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 169 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
170 | } |
171 | ||
57d7366b | 172 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 173 | { |
57d7366b | 174 | tf->nsect = drive->sect; |
aaaade3f | 175 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
176 | } |
177 | ||
57d7366b | 178 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 179 | { |
57d7366b | 180 | tf->nsect = drive->mult_req; |
aaaade3f | 181 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
182 | } |
183 | ||
184 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
185 | { | |
186 | special_t *s = &drive->special; | |
22aa4b32 | 187 | struct ide_cmd cmd; |
1da177e4 | 188 | |
22aa4b32 | 189 | memset(&cmd, 0, sizeof(cmd)); |
0dfb991c | 190 | cmd.protocol = ATA_PROT_NODATA; |
1da177e4 LT |
191 | |
192 | if (s->b.set_geometry) { | |
193 | s->b.set_geometry = 0; | |
22aa4b32 | 194 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
1da177e4 LT |
195 | } else if (s->b.recalibrate) { |
196 | s->b.recalibrate = 0; | |
22aa4b32 | 197 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
1da177e4 LT |
198 | } else if (s->b.set_multmode) { |
199 | s->b.set_multmode = 0; | |
22aa4b32 | 200 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
1da177e4 LT |
201 | } else if (s->all) { |
202 | int special = s->all; | |
203 | s->all = 0; | |
204 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
205 | return ide_stopped; | |
206 | } | |
207 | ||
22aa4b32 BZ |
208 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
209 | IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 210 | |
22aa4b32 | 211 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
212 | |
213 | return ide_started; | |
214 | } | |
215 | ||
216 | /** | |
217 | * do_special - issue some special commands | |
218 | * @drive: drive the command is for | |
219 | * | |
aaaade3f BZ |
220 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
221 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
222 | * | |
223 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
224 | */ |
225 | ||
226 | static ide_startstop_t do_special (ide_drive_t *drive) | |
227 | { | |
228 | special_t *s = &drive->special; | |
229 | ||
230 | #ifdef DEBUG | |
231 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
232 | #endif | |
6982daf7 BZ |
233 | if (drive->media == ide_disk) |
234 | return ide_disk_special(drive); | |
1da177e4 | 235 | |
6982daf7 BZ |
236 | s->all = 0; |
237 | drive->mult_req = 0; | |
238 | return ide_stopped; | |
1da177e4 LT |
239 | } |
240 | ||
22981694 | 241 | void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
1da177e4 LT |
242 | { |
243 | ide_hwif_t *hwif = drive->hwif; | |
244 | struct scatterlist *sg = hwif->sg_table; | |
22981694 | 245 | struct request *rq = cmd->rq; |
1da177e4 | 246 | |
9e772d01 | 247 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 | 248 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
b6308ee0 | 249 | cmd->sg_nents = 1; |
9e772d01 BP |
250 | } else if (!rq->bio) { |
251 | sg_init_one(sg, rq->data, rq->data_len); | |
b6308ee0 BZ |
252 | cmd->sg_nents = 1; |
253 | } else | |
254 | cmd->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 | 255 | } |
1da177e4 LT |
256 | EXPORT_SYMBOL_GPL(ide_map_sg); |
257 | ||
bf717c0a | 258 | void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes) |
1da177e4 | 259 | { |
bf717c0a | 260 | cmd->nbytes = cmd->nleft = nr_bytes; |
b6308ee0 BZ |
261 | cmd->cursg_ofs = 0; |
262 | cmd->cursg = NULL; | |
1da177e4 | 263 | } |
1da177e4 LT |
264 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
265 | ||
266 | /** | |
267 | * execute_drive_command - issue special drive command | |
338cec32 | 268 | * @drive: the drive to issue the command on |
1da177e4 LT |
269 | * @rq: the request structure holding the command |
270 | * | |
271 | * execute_drive_cmd() issues a special drive command, usually | |
272 | * initiated by ioctl() from the external hdparm program. The | |
273 | * command can be a drive command, drive task or taskfile | |
274 | * operation. Weirdly you can call it with NULL to wait for | |
275 | * all commands to finish. Don't do this as that is due to change | |
276 | */ | |
277 | ||
278 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
279 | struct request *rq) | |
280 | { | |
22aa4b32 | 281 | struct ide_cmd *cmd = rq->special; |
1da177e4 | 282 | |
22aa4b32 | 283 | if (cmd) { |
0dfb991c | 284 | if (cmd->protocol == ATA_PROT_PIO) { |
bf717c0a | 285 | ide_init_sg_cmd(cmd, rq->nr_sectors << 9); |
22981694 | 286 | ide_map_sg(drive, cmd); |
1da177e4 | 287 | } |
74095a91 | 288 | |
22aa4b32 | 289 | return do_rw_taskfile(drive, cmd); |
21d535c9 BZ |
290 | } |
291 | ||
1da177e4 LT |
292 | /* |
293 | * NULL is actually a valid way of waiting for | |
294 | * all current requests to be flushed from the queue. | |
295 | */ | |
296 | #ifdef DEBUG | |
297 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
298 | #endif | |
6902a533 | 299 | rq->errors = 0; |
f974b196 | 300 | ide_complete_rq(drive, 0, blk_rq_bytes(rq)); |
64a57fe4 | 301 | |
1da177e4 | 302 | return ide_stopped; |
1bc6daae BZ |
303 | } |
304 | ||
79e36a9f EO |
305 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
306 | { | |
4abdc6ee EO |
307 | u8 cmd = rq->cmd[0]; |
308 | ||
4abdc6ee | 309 | switch (cmd) { |
1bc6daae BZ |
310 | case REQ_PARK_HEADS: |
311 | case REQ_UNPARK_HEADS: | |
312 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 313 | case REQ_DEVSET_EXEC: |
1bc6daae | 314 | return ide_do_devset(drive, rq); |
79e36a9f EO |
315 | case REQ_DRIVE_RESET: |
316 | return ide_do_reset(drive); | |
317 | default: | |
1713788f | 318 | BUG(); |
79e36a9f EO |
319 | } |
320 | } | |
321 | ||
1da177e4 LT |
322 | /** |
323 | * start_request - start of I/O and command issuing for IDE | |
324 | * | |
325 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 326 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
327 | * |
328 | * FIXME: this function needs a rename | |
329 | */ | |
330 | ||
331 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
332 | { | |
333 | ide_startstop_t startstop; | |
1da177e4 | 334 | |
4aff5e23 | 335 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
336 | |
337 | #ifdef DEBUG | |
338 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 339 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
340 | #endif |
341 | ||
342 | /* bail early if we've exceeded max_failures */ | |
343 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 344 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
345 | goto kill_rq; |
346 | } | |
347 | ||
ad3cadda JA |
348 | if (blk_pm_request(rq)) |
349 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
350 | |
351 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
352 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
353 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
354 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
355 | return startstop; | |
356 | } | |
357 | if (!drive->special.all) { | |
7f3c868b | 358 | struct ide_driver *drv; |
1da177e4 | 359 | |
513daadd SS |
360 | /* |
361 | * We reset the drive so we need to issue a SETFEATURES. | |
362 | * Do it _after_ do_special() restored device parameters. | |
363 | */ | |
364 | if (drive->current_speed == 0xff) | |
365 | ide_config_drive_speed(drive, drive->desired_speed); | |
366 | ||
7267c337 | 367 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
368 | return execute_drive_cmd(drive, rq); |
369 | else if (blk_pm_request(rq)) { | |
c00895ab | 370 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
371 | #ifdef DEBUG_PM |
372 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 373 | drive->name, pm->pm_step); |
1da177e4 LT |
374 | #endif |
375 | startstop = ide_start_power_step(drive, rq); | |
376 | if (startstop == ide_stopped && | |
0d346ba0 | 377 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 378 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 379 | return startstop; |
79e36a9f EO |
380 | } else if (!rq->rq_disk && blk_special_request(rq)) |
381 | /* | |
382 | * TODO: Once all ULDs have been modified to | |
383 | * check for specific op codes rather than | |
384 | * blindly accepting any special request, the | |
385 | * check for ->rq_disk above may be replaced | |
386 | * by a more suitable mechanism or even | |
387 | * dropped entirely. | |
388 | */ | |
389 | return ide_special_rq(drive, rq); | |
1da177e4 | 390 | |
7f3c868b | 391 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
392 | |
393 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
394 | } |
395 | return do_special(drive); | |
396 | kill_rq: | |
397 | ide_kill_rq(drive, rq); | |
398 | return ide_stopped; | |
399 | } | |
400 | ||
401 | /** | |
402 | * ide_stall_queue - pause an IDE device | |
403 | * @drive: drive to stall | |
404 | * @timeout: time to stall for (jiffies) | |
405 | * | |
406 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 407 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
408 | */ |
409 | ||
410 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
411 | { | |
412 | if (timeout > WAIT_WORSTCASE) | |
413 | timeout = WAIT_WORSTCASE; | |
414 | drive->sleep = timeout + jiffies; | |
97100fc8 | 415 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 416 | } |
1da177e4 LT |
417 | EXPORT_SYMBOL(ide_stall_queue); |
418 | ||
5b31f855 BZ |
419 | static inline int ide_lock_port(ide_hwif_t *hwif) |
420 | { | |
421 | if (hwif->busy) | |
422 | return 1; | |
423 | ||
424 | hwif->busy = 1; | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
430 | { | |
431 | hwif->busy = 0; | |
432 | } | |
433 | ||
434 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
435 | { | |
436 | int rc = 0; | |
437 | ||
438 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
439 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
440 | if (rc == 0) { | |
e354c1d8 BZ |
441 | if (host->get_lock) |
442 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
443 | } |
444 | } | |
445 | return rc; | |
446 | } | |
447 | ||
448 | static inline void ide_unlock_host(struct ide_host *host) | |
449 | { | |
450 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
451 | if (host->release_lock) |
452 | host->release_lock(); | |
5b31f855 BZ |
453 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
454 | } | |
455 | } | |
456 | ||
1da177e4 | 457 | /* |
b65fac32 | 458 | * Issue a new request to a device. |
1da177e4 | 459 | */ |
295f0004 | 460 | void do_ide_request(struct request_queue *q) |
1da177e4 | 461 | { |
201bffa4 BZ |
462 | ide_drive_t *drive = q->queuedata; |
463 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 464 | struct ide_host *host = hwif->host; |
5b31f855 | 465 | struct request *rq = NULL; |
1da177e4 LT |
466 | ide_startstop_t startstop; |
467 | ||
201bffa4 BZ |
468 | /* |
469 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
470 | * though that is 3 requests, it must be seen as a single transaction. | |
471 | * we must not preempt this drive until that is complete | |
472 | */ | |
473 | if (blk_queue_flushing(q)) | |
1da177e4 | 474 | /* |
201bffa4 BZ |
475 | * small race where queue could get replugged during |
476 | * the 3-request flush cycle, just yank the plug since | |
477 | * we want it to finish asap | |
1da177e4 | 478 | */ |
201bffa4 | 479 | blk_remove_plug(q); |
1da177e4 | 480 | |
201bffa4 | 481 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
482 | |
483 | if (ide_lock_host(host, hwif)) | |
484 | goto plug_device_2; | |
485 | ||
b65fac32 | 486 | spin_lock_irq(&hwif->lock); |
295f0004 | 487 | |
5b31f855 | 488 | if (!ide_lock_port(hwif)) { |
42cf2611 | 489 | ide_hwif_t *prev_port; |
201bffa4 | 490 | repeat: |
bd53cbcc | 491 | prev_port = hwif->host->cur_port; |
b65fac32 | 492 | hwif->rq = NULL; |
2fb21150 | 493 | |
9010941c EO |
494 | if (drive->dev_flags & IDE_DFLAG_SLEEPING && |
495 | time_after(drive->sleep, jiffies)) { | |
496 | ide_unlock_port(hwif); | |
497 | goto plug_device; | |
201bffa4 | 498 | } |
295f0004 | 499 | |
bd53cbcc BZ |
500 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
501 | hwif != prev_port) { | |
7299a391 | 502 | /* |
42cf2611 | 503 | * set nIEN for previous port, drives in the |
7299a391 BZ |
504 | * quirk_list may not like intr setups/cleanups |
505 | */ | |
b65fac32 | 506 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
ecf3a31d SS |
507 | prev_port->tp_ops->write_devctl(prev_port, |
508 | ATA_NIEN | | |
509 | ATA_DEVCTL_OBS); | |
bd53cbcc BZ |
510 | |
511 | hwif->host->cur_port = hwif; | |
1da177e4 | 512 | } |
b65fac32 | 513 | hwif->cur_dev = drive; |
4abdc6ee | 514 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 515 | |
b65fac32 | 516 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 517 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
518 | /* |
519 | * we know that the queue isn't empty, but this can happen | |
520 | * if the q->prep_rq_fn() decides to kill a request | |
521 | */ | |
522 | rq = elv_next_request(drive->queue); | |
201bffa4 | 523 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 524 | spin_lock_irq(&hwif->lock); |
201bffa4 | 525 | |
1da177e4 | 526 | if (!rq) { |
5b31f855 | 527 | ide_unlock_port(hwif); |
201bffa4 | 528 | goto out; |
1da177e4 LT |
529 | } |
530 | ||
531 | /* | |
532 | * Sanity: don't accept a request that isn't a PM request | |
533 | * if we are currently power managed. This is very important as | |
534 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
535 | * above to return us whatever is in the queue. Since we call | |
536 | * ide_do_request() ourselves, we end up taking requests while | |
537 | * the queue is blocked... | |
538 | * | |
539 | * We let requests forced at head of queue with ide-preempt | |
540 | * though. I hope that doesn't happen too much, hopefully not | |
541 | * unless the subdriver triggers such a thing in its own PM | |
542 | * state machine. | |
543 | */ | |
97100fc8 BZ |
544 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
545 | blk_pm_request(rq) == 0 && | |
546 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 547 | /* there should be no pending command at this point */ |
5b31f855 | 548 | ide_unlock_port(hwif); |
295f0004 | 549 | goto plug_device; |
1da177e4 LT |
550 | } |
551 | ||
b65fac32 | 552 | hwif->rq = rq; |
1da177e4 | 553 | |
b65fac32 | 554 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 555 | startstop = start_request(drive, rq); |
b65fac32 | 556 | spin_lock_irq(&hwif->lock); |
295f0004 | 557 | |
201bffa4 BZ |
558 | if (startstop == ide_stopped) |
559 | goto repeat; | |
560 | } else | |
561 | goto plug_device; | |
562 | out: | |
b65fac32 | 563 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
564 | if (rq == NULL) |
565 | ide_unlock_host(host); | |
201bffa4 | 566 | spin_lock_irq(q->queue_lock); |
295f0004 | 567 | return; |
1da177e4 | 568 | |
295f0004 | 569 | plug_device: |
b65fac32 | 570 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
571 | ide_unlock_host(host); |
572 | plug_device_2: | |
201bffa4 BZ |
573 | spin_lock_irq(q->queue_lock); |
574 | ||
575 | if (!elv_queue_empty(q)) | |
576 | blk_plug_device(q); | |
1da177e4 LT |
577 | } |
578 | ||
201bffa4 BZ |
579 | static void ide_plug_device(ide_drive_t *drive) |
580 | { | |
581 | struct request_queue *q = drive->queue; | |
582 | unsigned long flags; | |
583 | ||
584 | spin_lock_irqsave(q->queue_lock, flags); | |
585 | if (!elv_queue_empty(q)) | |
586 | blk_plug_device(q); | |
587 | spin_unlock_irqrestore(q->queue_lock, flags); | |
588 | } | |
589 | ||
b6a45a0b BZ |
590 | static int drive_is_ready(ide_drive_t *drive) |
591 | { | |
592 | ide_hwif_t *hwif = drive->hwif; | |
593 | u8 stat = 0; | |
594 | ||
595 | if (drive->waiting_for_dma) | |
596 | return hwif->dma_ops->dma_test_irq(drive); | |
597 | ||
598 | if (hwif->io_ports.ctl_addr && | |
599 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
600 | stat = hwif->tp_ops->read_altstatus(hwif); | |
601 | else | |
602 | /* Note: this may clear a pending IRQ!! */ | |
603 | stat = hwif->tp_ops->read_status(hwif); | |
604 | ||
605 | if (stat & ATA_BUSY) | |
606 | /* drive busy: definitely not interrupting */ | |
607 | return 0; | |
608 | ||
609 | /* drive ready: *might* be interrupting */ | |
610 | return 1; | |
611 | } | |
612 | ||
1da177e4 LT |
613 | /** |
614 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 615 | * @data: timer callback magic (hwif) |
1da177e4 LT |
616 | * |
617 | * An IDE command has timed out before the expected drive return | |
618 | * occurred. At this point we attempt to clean up the current | |
619 | * mess. If the current handler includes an expiry handler then | |
620 | * we invoke the expiry handler, and providing it is happy the | |
621 | * work is done. If that fails we apply generic recovery rules | |
622 | * invoking the handler and checking the drive DMA status. We | |
623 | * have an excessively incestuous relationship with the DMA | |
624 | * logic that wants cleaning up. | |
625 | */ | |
626 | ||
627 | void ide_timer_expiry (unsigned long data) | |
628 | { | |
b65fac32 | 629 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 630 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 631 | ide_handler_t *handler; |
1da177e4 | 632 | unsigned long flags; |
e0c6dcd8 | 633 | int wait = -1; |
201bffa4 | 634 | int plug_device = 0; |
1da177e4 | 635 | |
b65fac32 BZ |
636 | spin_lock_irqsave(&hwif->lock, flags); |
637 | ||
638 | handler = hwif->handler; | |
1da177e4 | 639 | |
b65fac32 | 640 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
641 | /* |
642 | * Either a marginal timeout occurred | |
643 | * (got the interrupt just as timer expired), | |
644 | * or we were "sleeping" to give other devices a chance. | |
645 | * Either way, we don't really want to complain about anything. | |
646 | */ | |
1da177e4 | 647 | } else { |
c38714ed BZ |
648 | ide_expiry_t *expiry = hwif->expiry; |
649 | ide_startstop_t startstop = ide_stopped; | |
650 | ||
b65fac32 | 651 | drive = hwif->cur_dev; |
c38714ed BZ |
652 | |
653 | if (expiry) { | |
654 | wait = expiry(drive); | |
655 | if (wait > 0) { /* continue */ | |
656 | /* reset timer */ | |
657 | hwif->timer.expires = jiffies + wait; | |
658 | hwif->req_gen_timer = hwif->req_gen; | |
659 | add_timer(&hwif->timer); | |
660 | spin_unlock_irqrestore(&hwif->lock, flags); | |
661 | return; | |
295f0004 | 662 | } |
1da177e4 | 663 | } |
c38714ed | 664 | hwif->handler = NULL; |
60c0cd02 | 665 | hwif->expiry = NULL; |
c38714ed BZ |
666 | /* |
667 | * We need to simulate a real interrupt when invoking | |
668 | * the handler() function, which means we need to | |
669 | * globally mask the specific IRQ: | |
670 | */ | |
671 | spin_unlock(&hwif->lock); | |
672 | /* disable_irq_nosync ?? */ | |
673 | disable_irq(hwif->irq); | |
674 | /* local CPU only, as if we were handling an interrupt */ | |
675 | local_irq_disable(); | |
676 | if (hwif->polling) { | |
677 | startstop = handler(drive); | |
678 | } else if (drive_is_ready(drive)) { | |
679 | if (drive->waiting_for_dma) | |
680 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
681 | if (hwif->ack_intr) |
682 | hwif->ack_intr(hwif); | |
c38714ed BZ |
683 | printk(KERN_WARNING "%s: lost interrupt\n", |
684 | drive->name); | |
685 | startstop = handler(drive); | |
686 | } else { | |
687 | if (drive->waiting_for_dma) | |
688 | startstop = ide_dma_timeout_retry(drive, wait); | |
689 | else | |
690 | startstop = ide_error(drive, "irq timeout", | |
691 | hwif->tp_ops->read_status(hwif)); | |
692 | } | |
693 | spin_lock_irq(&hwif->lock); | |
694 | enable_irq(hwif->irq); | |
695 | if (startstop == ide_stopped) { | |
696 | ide_unlock_port(hwif); | |
697 | plug_device = 1; | |
698 | } | |
1da177e4 | 699 | } |
b65fac32 | 700 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 701 | |
5b31f855 BZ |
702 | if (plug_device) { |
703 | ide_unlock_host(hwif->host); | |
201bffa4 | 704 | ide_plug_device(drive); |
5b31f855 | 705 | } |
1da177e4 LT |
706 | } |
707 | ||
708 | /** | |
709 | * unexpected_intr - handle an unexpected IDE interrupt | |
710 | * @irq: interrupt line | |
bd53cbcc | 711 | * @hwif: port being processed |
1da177e4 LT |
712 | * |
713 | * There's nothing really useful we can do with an unexpected interrupt, | |
714 | * other than reading the status register (to clear it), and logging it. | |
715 | * There should be no way that an irq can happen before we're ready for it, | |
716 | * so we needn't worry much about losing an "important" interrupt here. | |
717 | * | |
718 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
719 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
720 | * looks "good", we just ignore the interrupt completely. | |
721 | * | |
722 | * This routine assumes __cli() is in effect when called. | |
723 | * | |
724 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
725 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
726 | * we could screw up by interfering with a new request being set up for | |
727 | * irq15. | |
728 | * | |
729 | * In reality, this is a non-issue. The new command is not sent unless | |
730 | * the drive is ready to accept one, in which case we know the drive is | |
731 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
732 | * before completing the issuance of any new drive command, so we will not | |
733 | * be accidentally invoked as a result of any valid command completion | |
734 | * interrupt. | |
1da177e4 | 735 | */ |
bd53cbcc BZ |
736 | |
737 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 738 | { |
ae86afae BZ |
739 | u8 stat = hwif->tp_ops->read_status(hwif); |
740 | ||
741 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
742 | /* Try to not flood the console with msgs */ | |
743 | static unsigned long last_msgtime, count; | |
744 | ++count; | |
745 | ||
746 | if (time_after(jiffies, last_msgtime + HZ)) { | |
747 | last_msgtime = jiffies; | |
748 | printk(KERN_ERR "%s: unexpected interrupt, " | |
749 | "status=0x%02x, count=%ld\n", | |
750 | hwif->name, stat, count); | |
1da177e4 | 751 | } |
ae86afae | 752 | } |
1da177e4 LT |
753 | } |
754 | ||
755 | /** | |
756 | * ide_intr - default IDE interrupt handler | |
757 | * @irq: interrupt number | |
ae86afae | 758 | * @dev_id: hwif |
1da177e4 LT |
759 | * @regs: unused weirdness from the kernel irq layer |
760 | * | |
761 | * This is the default IRQ handler for the IDE layer. You should | |
762 | * not need to override it. If you do be aware it is subtle in | |
763 | * places | |
764 | * | |
bd53cbcc | 765 | * hwif is the interface in the group currently performing |
b65fac32 | 766 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
767 | * the IRQ handler to call. As we issue a command the handlers |
768 | * step through multiple states, reassigning the handler to the | |
769 | * next step in the process. Unlike a smart SCSI controller IDE | |
770 | * expects the main processor to sequence the various transfer | |
771 | * stages. We also manage a poll timer to catch up with most | |
772 | * timeout situations. There are still a few where the handlers | |
773 | * don't ever decide to give up. | |
774 | * | |
775 | * The handler eventually returns ide_stopped to indicate the | |
776 | * request completed. At this point we issue the next request | |
b65fac32 | 777 | * on the port and the process begins again. |
1da177e4 | 778 | */ |
b65fac32 | 779 | |
7d12e780 | 780 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 781 | { |
ae86afae | 782 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 783 | struct ide_host *host = hwif->host; |
201bffa4 | 784 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 785 | ide_handler_t *handler; |
ae86afae | 786 | unsigned long flags; |
1da177e4 | 787 | ide_startstop_t startstop; |
3e0e29f7 | 788 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 789 | int plug_device = 0; |
1da177e4 | 790 | |
255115fb BZ |
791 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
792 | if (hwif != host->cur_port) | |
ae86afae BZ |
793 | goto out_early; |
794 | } | |
bd53cbcc | 795 | |
b65fac32 | 796 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 797 | |
d15a613b | 798 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 799 | goto out; |
1da177e4 | 800 | |
b65fac32 BZ |
801 | handler = hwif->handler; |
802 | ||
803 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
804 | /* |
805 | * Not expecting an interrupt from this drive. | |
806 | * That means this could be: | |
807 | * (1) an interrupt from another PCI device | |
808 | * sharing the same PCI INT# as us. | |
809 | * or (2) a drive just entered sleep or standby mode, | |
810 | * and is interrupting to let us know. | |
811 | * or (3) a spurious interrupt of unknown origin. | |
812 | * | |
813 | * For PCI, we cannot tell the difference, | |
814 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 815 | */ |
255115fb | 816 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
817 | /* |
818 | * Probably not a shared PCI interrupt, | |
819 | * so we can safely try to do something about it: | |
820 | */ | |
bd53cbcc | 821 | unexpected_intr(irq, hwif); |
1da177e4 LT |
822 | } else { |
823 | /* | |
824 | * Whack the status register, just in case | |
825 | * we have a leftover pending IRQ. | |
826 | */ | |
374e042c | 827 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 828 | } |
3e0e29f7 | 829 | goto out; |
1da177e4 | 830 | } |
3e0e29f7 | 831 | |
b65fac32 | 832 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
833 | |
834 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
835 | /* |
836 | * This happens regularly when we share a PCI IRQ with | |
837 | * another device. Unfortunately, it can also happen | |
838 | * with some buggy drives that trigger the IRQ before | |
839 | * their status register is up to date. Hopefully we have | |
840 | * enough advance overhead that the latter isn't a problem. | |
841 | */ | |
3e0e29f7 BZ |
842 | goto out; |
843 | ||
b65fac32 | 844 | hwif->handler = NULL; |
60c0cd02 | 845 | hwif->expiry = NULL; |
b65fac32 BZ |
846 | hwif->req_gen++; |
847 | del_timer(&hwif->timer); | |
848 | spin_unlock(&hwif->lock); | |
1da177e4 | 849 | |
bfa7d8e5 BZ |
850 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
851 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 852 | |
97100fc8 | 853 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 854 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 855 | |
1da177e4 LT |
856 | /* service this interrupt, may set handler for next interrupt */ |
857 | startstop = handler(drive); | |
1da177e4 | 858 | |
b65fac32 | 859 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
860 | /* |
861 | * Note that handler() may have set things up for another | |
862 | * interrupt to occur soon, but it cannot happen until | |
863 | * we exit from this routine, because it will be the | |
864 | * same irq as is currently being serviced here, and Linux | |
865 | * won't allow another of the same (on any CPU) until we return. | |
866 | */ | |
1da177e4 | 867 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
868 | BUG_ON(hwif->handler); |
869 | ide_unlock_port(hwif); | |
870 | plug_device = 1; | |
1da177e4 | 871 | } |
3e0e29f7 BZ |
872 | irq_ret = IRQ_HANDLED; |
873 | out: | |
b65fac32 | 874 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 875 | out_early: |
5b31f855 BZ |
876 | if (plug_device) { |
877 | ide_unlock_host(hwif->host); | |
201bffa4 | 878 | ide_plug_device(drive); |
5b31f855 | 879 | } |
201bffa4 | 880 | |
3e0e29f7 | 881 | return irq_ret; |
1da177e4 | 882 | } |
849d7130 | 883 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 884 | |
9f87abe8 BZ |
885 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
886 | { | |
887 | ide_hwif_t *hwif = drive->hwif; | |
888 | u8 buf[4] = { 0 }; | |
889 | ||
890 | while (len > 0) { | |
891 | if (write) | |
374e042c | 892 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 893 | else |
374e042c | 894 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
895 | len -= 4; |
896 | } | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |