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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IDE I/O functions | |
3 | * | |
4 | * Basic PIO and command management functionality. | |
5 | * | |
6 | * This code was split off from ide.c. See ide.c for history and original | |
7 | * copyrights. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2, or (at your option) any | |
12 | * later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * For the avoidance of doubt the "preferred form" of this code is one which | |
20 | * is in an open non patent encumbered format. Where cryptographic key signing | |
21 | * forms part of the process of creating an executable the information | |
22 | * including keys needed to generate an equivalently functional executable | |
23 | * are deemed to be part of the source code. | |
24 | */ | |
25 | ||
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/major.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/genhd.h> | |
37 | #include <linux/blkpg.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/pci.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/ide.h> | |
43 | #include <linux/completion.h> | |
44 | #include <linux/reboot.h> | |
45 | #include <linux/cdrom.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/device.h> | |
48 | #include <linux/kmod.h> | |
49 | #include <linux/scatterlist.h> | |
1977f032 | 50 | #include <linux/bitops.h> |
1da177e4 LT |
51 | |
52 | #include <asm/byteorder.h> | |
53 | #include <asm/irq.h> | |
7c0f6ba6 | 54 | #include <linux/uaccess.h> |
1da177e4 | 55 | #include <asm/io.h> |
1da177e4 | 56 | |
2a842aca | 57 | int ide_end_rq(ide_drive_t *drive, struct request *rq, blk_status_t 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 | ||
60033520 | 70 | if (!blk_update_request(rq, error, nr_bytes)) { |
9a6d5488 | 71 | if (rq == drive->sense_rq) { |
60033520 | 72 | drive->sense_rq = NULL; |
9a6d5488 JA |
73 | drive->sense_rq_active = false; |
74 | } | |
60033520 JA |
75 | |
76 | __blk_mq_end_request(rq, error); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | return 1; | |
1da177e4 | 81 | } |
1caf236d | 82 | EXPORT_SYMBOL_GPL(ide_end_rq); |
1da177e4 | 83 | |
22aa4b32 | 84 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
e120237c | 85 | { |
35218d1c | 86 | const struct ide_tp_ops *tp_ops = drive->hwif->tp_ops; |
22aa4b32 BZ |
87 | struct ide_taskfile *tf = &cmd->tf; |
88 | struct request *rq = cmd->rq; | |
e7fedc3c | 89 | u8 tf_cmd = tf->command; |
e120237c BZ |
90 | |
91 | tf->error = err; | |
92 | tf->status = stat; | |
93 | ||
35218d1c SS |
94 | if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) { |
95 | u8 data[2]; | |
96 | ||
97 | tp_ops->input_data(drive, cmd, data, 2); | |
98 | ||
745483f1 SS |
99 | cmd->tf.data = data[0]; |
100 | cmd->hob.data = data[1]; | |
35218d1c SS |
101 | } |
102 | ||
3153c26b | 103 | ide_tf_readback(drive, cmd); |
e120237c | 104 | |
e7fedc3c BZ |
105 | if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
106 | tf_cmd == ATA_CMD_IDLEIMMEDIATE) { | |
107 | if (tf->lbal != 0xc4) { | |
108 | printk(KERN_ERR "%s: head unload failed!\n", | |
109 | drive->name); | |
745483f1 | 110 | ide_tf_dump(drive->name, cmd); |
e7fedc3c BZ |
111 | } else |
112 | drive->dev_flags |= IDE_DFLAG_PARKED; | |
113 | } | |
114 | ||
2f5a8e80 | 115 | if (rq && ata_taskfile_request(rq)) { |
22ce0a7c | 116 | struct ide_cmd *orig_cmd = ide_req(rq)->special; |
a09485df | 117 | |
f505d49f BZ |
118 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
119 | kfree(orig_cmd); | |
acfead32 | 120 | else if (cmd != orig_cmd) |
f505d49f BZ |
121 | memcpy(orig_cmd, cmd, sizeof(*cmd)); |
122 | } | |
e120237c BZ |
123 | } |
124 | ||
2a842aca | 125 | int ide_complete_rq(ide_drive_t *drive, blk_status_t error, unsigned int nr_bytes) |
1da177e4 | 126 | { |
b65fac32 BZ |
127 | ide_hwif_t *hwif = drive->hwif; |
128 | struct request *rq = hwif->rq; | |
a9587fd8 | 129 | int rc; |
1da177e4 | 130 | |
130e8867 BZ |
131 | /* |
132 | * if failfast is set on a request, override number of sectors | |
133 | * and complete the whole request right now | |
134 | */ | |
2a842aca | 135 | if (blk_noretry_request(rq) && error) |
5b93629b | 136 | nr_bytes = blk_rq_sectors(rq) << 9; |
130e8867 | 137 | |
ba7d479c | 138 | rc = ide_end_rq(drive, rq, error, nr_bytes); |
a9587fd8 BZ |
139 | if (rc == 0) |
140 | hwif->rq = NULL; | |
1d0bf587 | 141 | |
a9587fd8 | 142 | return rc; |
1da177e4 | 143 | } |
a09485df | 144 | EXPORT_SYMBOL(ide_complete_rq); |
1da177e4 | 145 | |
327fa1c2 | 146 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 | 147 | { |
2f5a8e80 | 148 | u8 drv_req = ata_misc_request(rq) && rq->rq_disk; |
3ee38302 BZ |
149 | u8 media = drive->media; |
150 | ||
c152cc1a BZ |
151 | drive->failed_pc = NULL; |
152 | ||
6902a533 | 153 | if ((media == ide_floppy || media == ide_tape) && drv_req) { |
17d5363b | 154 | scsi_req(rq)->result = 0; |
6902a533 BZ |
155 | } else { |
156 | if (media == ide_tape) | |
17d5363b CH |
157 | scsi_req(rq)->result = IDE_DRV_ERROR_GENERAL; |
158 | else if (blk_rq_is_passthrough(rq) && scsi_req(rq)->result == 0) | |
159 | scsi_req(rq)->result = -EIO; | |
6902a533 | 160 | } |
5e955245 | 161 | |
2a842aca | 162 | ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq)); |
1da177e4 LT |
163 | } |
164 | ||
57d7366b | 165 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 166 | { |
57d7366b BZ |
167 | tf->nsect = drive->sect; |
168 | tf->lbal = drive->sect; | |
169 | tf->lbam = drive->cyl; | |
170 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 171 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 172 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
173 | } |
174 | ||
57d7366b | 175 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 176 | { |
57d7366b | 177 | tf->nsect = drive->sect; |
aaaade3f | 178 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
179 | } |
180 | ||
57d7366b | 181 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 182 | { |
57d7366b | 183 | tf->nsect = drive->mult_req; |
aaaade3f | 184 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
185 | } |
186 | ||
582078ee BZ |
187 | /** |
188 | * do_special - issue some special commands | |
189 | * @drive: drive the command is for | |
190 | * | |
191 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, | |
192 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
193 | */ | |
194 | ||
195 | static ide_startstop_t do_special(ide_drive_t *drive) | |
1da177e4 | 196 | { |
22aa4b32 | 197 | struct ide_cmd cmd; |
1da177e4 | 198 | |
582078ee | 199 | #ifdef DEBUG |
ca1b96e0 BZ |
200 | printk(KERN_DEBUG "%s: %s: 0x%02x\n", drive->name, __func__, |
201 | drive->special_flags); | |
582078ee BZ |
202 | #endif |
203 | if (drive->media != ide_disk) { | |
ca1b96e0 | 204 | drive->special_flags = 0; |
582078ee BZ |
205 | drive->mult_req = 0; |
206 | return ide_stopped; | |
207 | } | |
208 | ||
22aa4b32 | 209 | memset(&cmd, 0, sizeof(cmd)); |
0dfb991c | 210 | cmd.protocol = ATA_PROT_NODATA; |
1da177e4 | 211 | |
ca1b96e0 BZ |
212 | if (drive->special_flags & IDE_SFLAG_SET_GEOMETRY) { |
213 | drive->special_flags &= ~IDE_SFLAG_SET_GEOMETRY; | |
22aa4b32 | 214 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
ca1b96e0 BZ |
215 | } else if (drive->special_flags & IDE_SFLAG_RECALIBRATE) { |
216 | drive->special_flags &= ~IDE_SFLAG_RECALIBRATE; | |
22aa4b32 | 217 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
ca1b96e0 BZ |
218 | } else if (drive->special_flags & IDE_SFLAG_SET_MULTMODE) { |
219 | drive->special_flags &= ~IDE_SFLAG_SET_MULTMODE; | |
22aa4b32 | 220 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
5f582c8e BZ |
221 | } else |
222 | BUG(); | |
1da177e4 | 223 | |
60f85019 SS |
224 | cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; |
225 | cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; | |
226 | cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER; | |
74095a91 | 227 | |
22aa4b32 | 228 | do_rw_taskfile(drive, &cmd); |
1da177e4 LT |
229 | |
230 | return ide_started; | |
231 | } | |
232 | ||
22981694 | 233 | void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
1da177e4 LT |
234 | { |
235 | ide_hwif_t *hwif = drive->hwif; | |
bdf8710d | 236 | struct scatterlist *sg = hwif->sg_table, *last_sg = NULL; |
22981694 | 237 | struct request *rq = cmd->rq; |
1da177e4 | 238 | |
bdf8710d CH |
239 | cmd->sg_nents = __blk_rq_map_sg(drive->queue, rq, sg, &last_sg); |
240 | if (blk_rq_bytes(rq) && (blk_rq_bytes(rq) & rq->q->dma_pad_mask)) | |
241 | last_sg->length += | |
242 | (rq->q->dma_pad_mask & ~blk_rq_bytes(rq)) + 1; | |
1da177e4 | 243 | } |
1da177e4 LT |
244 | EXPORT_SYMBOL_GPL(ide_map_sg); |
245 | ||
bf717c0a | 246 | void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes) |
1da177e4 | 247 | { |
bf717c0a | 248 | cmd->nbytes = cmd->nleft = nr_bytes; |
b6308ee0 BZ |
249 | cmd->cursg_ofs = 0; |
250 | cmd->cursg = NULL; | |
1da177e4 | 251 | } |
1da177e4 LT |
252 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
253 | ||
254 | /** | |
255 | * execute_drive_command - issue special drive command | |
338cec32 | 256 | * @drive: the drive to issue the command on |
1da177e4 LT |
257 | * @rq: the request structure holding the command |
258 | * | |
259 | * execute_drive_cmd() issues a special drive command, usually | |
260 | * initiated by ioctl() from the external hdparm program. The | |
261 | * command can be a drive command, drive task or taskfile | |
262 | * operation. Weirdly you can call it with NULL to wait for | |
263 | * all commands to finish. Don't do this as that is due to change | |
264 | */ | |
265 | ||
266 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
267 | struct request *rq) | |
268 | { | |
22ce0a7c | 269 | struct ide_cmd *cmd = ide_req(rq)->special; |
1da177e4 | 270 | |
22aa4b32 | 271 | if (cmd) { |
0dfb991c | 272 | if (cmd->protocol == ATA_PROT_PIO) { |
9780e2dd | 273 | ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9); |
22981694 | 274 | ide_map_sg(drive, cmd); |
1da177e4 | 275 | } |
74095a91 | 276 | |
22aa4b32 | 277 | return do_rw_taskfile(drive, cmd); |
21d535c9 BZ |
278 | } |
279 | ||
1da177e4 LT |
280 | /* |
281 | * NULL is actually a valid way of waiting for | |
282 | * all current requests to be flushed from the queue. | |
283 | */ | |
284 | #ifdef DEBUG | |
285 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
286 | #endif | |
17d5363b | 287 | scsi_req(rq)->result = 0; |
2a842aca | 288 | ide_complete_rq(drive, BLK_STS_OK, blk_rq_bytes(rq)); |
64a57fe4 | 289 | |
1da177e4 | 290 | return ide_stopped; |
1bc6daae BZ |
291 | } |
292 | ||
79e36a9f EO |
293 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
294 | { | |
82ed4db4 | 295 | u8 cmd = scsi_req(rq)->cmd[0]; |
4abdc6ee | 296 | |
4abdc6ee | 297 | switch (cmd) { |
1bc6daae BZ |
298 | case REQ_PARK_HEADS: |
299 | case REQ_UNPARK_HEADS: | |
300 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 301 | case REQ_DEVSET_EXEC: |
1bc6daae | 302 | return ide_do_devset(drive, rq); |
79e36a9f EO |
303 | case REQ_DRIVE_RESET: |
304 | return ide_do_reset(drive); | |
305 | default: | |
1713788f | 306 | BUG(); |
79e36a9f EO |
307 | } |
308 | } | |
309 | ||
1da177e4 LT |
310 | /** |
311 | * start_request - start of I/O and command issuing for IDE | |
312 | * | |
313 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 314 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
315 | * |
316 | * FIXME: this function needs a rename | |
317 | */ | |
318 | ||
319 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
320 | { | |
321 | ide_startstop_t startstop; | |
1da177e4 | 322 | |
1da177e4 LT |
323 | #ifdef DEBUG |
324 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 325 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
326 | #endif |
327 | ||
328 | /* bail early if we've exceeded max_failures */ | |
329 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
e8064021 | 330 | rq->rq_flags |= RQF_FAILED; |
1da177e4 LT |
331 | goto kill_rq; |
332 | } | |
333 | ||
535ac5d3 | 334 | if (drive->prep_rq && !drive->prep_rq(drive, rq)) |
60033520 JA |
335 | return ide_stopped; |
336 | ||
a7928c15 | 337 | if (ata_pm_request(rq)) |
ad3cadda | 338 | ide_check_pm_state(drive, rq); |
1da177e4 | 339 | |
fdd88f0a | 340 | drive->hwif->tp_ops->dev_select(drive); |
3a7d2484 BZ |
341 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
342 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
343 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
344 | return startstop; | |
345 | } | |
ca1b96e0 BZ |
346 | |
347 | if (drive->special_flags == 0) { | |
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 | ||
2f5a8e80 | 357 | if (ata_taskfile_request(rq)) |
1da177e4 | 358 | return execute_drive_cmd(drive, rq); |
a7928c15 | 359 | else if (ata_pm_request(rq)) { |
22ce0a7c | 360 | struct ide_pm_state *pm = ide_req(rq)->special; |
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; |
2f5a8e80 | 370 | } else if (!rq->rq_disk && ata_misc_request(rq)) |
79e36a9f EO |
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 | 382 | |
9780e2dd | 383 | return drv->do_request(drive, rq, blk_rq_pos(rq)); |
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 | ||
782b86e2 JA |
447 | void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq) |
448 | { | |
449 | struct request_queue *q = drive->queue; | |
782b86e2 | 450 | |
60033520 JA |
451 | /* Use 3ms as that was the old plug delay */ |
452 | if (rq) { | |
453 | blk_mq_requeue_request(rq, false); | |
454 | blk_mq_delay_kick_requeue_list(q, 3); | |
455 | } else | |
456 | blk_mq_delay_run_hw_queue(q->queue_hw_ctx[0], 3); | |
782b86e2 JA |
457 | } |
458 | ||
9a6d5488 JA |
459 | blk_status_t ide_issue_rq(ide_drive_t *drive, struct request *rq, |
460 | bool local_requeue) | |
1da177e4 | 461 | { |
9a6d5488 | 462 | ide_hwif_t *hwif = drive->hwif; |
5b31f855 | 463 | struct ide_host *host = hwif->host; |
1da177e4 LT |
464 | ide_startstop_t startstop; |
465 | ||
9334ae5e JA |
466 | if (!blk_rq_is_passthrough(rq) && !(rq->rq_flags & RQF_DONTPREP)) { |
467 | rq->rq_flags |= RQF_DONTPREP; | |
468 | ide_req(rq)->special = NULL; | |
469 | } | |
470 | ||
02e7cf8f TH |
471 | /* HLD do_request() callback might sleep, make sure it's okay */ |
472 | might_sleep(); | |
473 | ||
5b31f855 | 474 | if (ide_lock_host(host, hwif)) |
60033520 JA |
475 | return BLK_STS_DEV_RESOURCE; |
476 | ||
b65fac32 | 477 | spin_lock_irq(&hwif->lock); |
295f0004 | 478 | |
5b31f855 | 479 | if (!ide_lock_port(hwif)) { |
42cf2611 | 480 | ide_hwif_t *prev_port; |
3503e0ac DM |
481 | |
482 | WARN_ON_ONCE(hwif->rq); | |
201bffa4 | 483 | repeat: |
bd53cbcc | 484 | prev_port = hwif->host->cur_port; |
9010941c EO |
485 | if (drive->dev_flags & IDE_DFLAG_SLEEPING && |
486 | time_after(drive->sleep, jiffies)) { | |
487 | ide_unlock_port(hwif); | |
488 | goto plug_device; | |
201bffa4 | 489 | } |
295f0004 | 490 | |
bd53cbcc BZ |
491 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
492 | hwif != prev_port) { | |
734affdc BZ |
493 | ide_drive_t *cur_dev = |
494 | prev_port ? prev_port->cur_dev : NULL; | |
495 | ||
7299a391 | 496 | /* |
42cf2611 | 497 | * set nIEN for previous port, drives in the |
734affdc | 498 | * quirk list may not like intr setups/cleanups |
7299a391 | 499 | */ |
734affdc BZ |
500 | if (cur_dev && |
501 | (cur_dev->dev_flags & IDE_DFLAG_NIEN_QUIRK) == 0) | |
ecf3a31d SS |
502 | prev_port->tp_ops->write_devctl(prev_port, |
503 | ATA_NIEN | | |
504 | ATA_DEVCTL_OBS); | |
bd53cbcc BZ |
505 | |
506 | hwif->host->cur_port = hwif; | |
1da177e4 | 507 | } |
b65fac32 | 508 | hwif->cur_dev = drive; |
4abdc6ee | 509 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 510 | |
1da177e4 LT |
511 | /* |
512 | * Sanity: don't accept a request that isn't a PM request | |
3503e0ac DM |
513 | * if we are currently power managed. This is very important as |
514 | * blk_stop_queue() doesn't prevent the blk_fetch_request() | |
515 | * above to return us whatever is in the queue. Since we call | |
516 | * ide_do_request() ourselves, we end up taking requests while | |
517 | * the queue is blocked... | |
1da177e4 | 518 | */ |
3503e0ac | 519 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
a7928c15 | 520 | ata_pm_request(rq) == 0 && |
5ae65383 | 521 | (rq->rq_flags & RQF_PM) == 0) { |
3503e0ac DM |
522 | /* there should be no pending command at this point */ |
523 | ide_unlock_port(hwif); | |
524 | goto plug_device; | |
525 | } | |
1da177e4 | 526 | |
82ed4db4 | 527 | scsi_req(rq)->resid_len = blk_rq_bytes(rq); |
b65fac32 | 528 | hwif->rq = rq; |
1da177e4 | 529 | |
b65fac32 | 530 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 531 | startstop = start_request(drive, rq); |
b65fac32 | 532 | spin_lock_irq(&hwif->lock); |
295f0004 | 533 | |
8f6205cd TH |
534 | if (startstop == ide_stopped) { |
535 | rq = hwif->rq; | |
536 | hwif->rq = NULL; | |
60033520 JA |
537 | if (rq) |
538 | goto repeat; | |
539 | ide_unlock_port(hwif); | |
540 | goto out; | |
8f6205cd | 541 | } |
60033520 JA |
542 | } else { |
543 | plug_device: | |
9a6d5488 JA |
544 | if (local_requeue) |
545 | list_add(&rq->queuelist, &drive->rq_list); | |
60033520 JA |
546 | spin_unlock_irq(&hwif->lock); |
547 | ide_unlock_host(host); | |
9a6d5488 JA |
548 | if (!local_requeue) |
549 | ide_requeue_and_plug(drive, rq); | |
60033520 JA |
550 | return BLK_STS_OK; |
551 | } | |
552 | ||
201bffa4 | 553 | out: |
b65fac32 | 554 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
555 | if (rq == NULL) |
556 | ide_unlock_host(host); | |
60033520 | 557 | return BLK_STS_OK; |
201bffa4 BZ |
558 | } |
559 | ||
9a6d5488 JA |
560 | /* |
561 | * Issue a new request to a device. | |
562 | */ | |
563 | blk_status_t ide_queue_rq(struct blk_mq_hw_ctx *hctx, | |
564 | const struct blk_mq_queue_data *bd) | |
565 | { | |
566 | ide_drive_t *drive = hctx->queue->queuedata; | |
567 | ide_hwif_t *hwif = drive->hwif; | |
568 | ||
569 | spin_lock_irq(&hwif->lock); | |
570 | if (drive->sense_rq_active) { | |
571 | spin_unlock_irq(&hwif->lock); | |
572 | return BLK_STS_DEV_RESOURCE; | |
573 | } | |
574 | spin_unlock_irq(&hwif->lock); | |
575 | ||
576 | blk_mq_start_request(bd->rq); | |
577 | return ide_issue_rq(drive, bd->rq, false); | |
578 | } | |
579 | ||
b6a45a0b BZ |
580 | static int drive_is_ready(ide_drive_t *drive) |
581 | { | |
582 | ide_hwif_t *hwif = drive->hwif; | |
583 | u8 stat = 0; | |
584 | ||
585 | if (drive->waiting_for_dma) | |
586 | return hwif->dma_ops->dma_test_irq(drive); | |
587 | ||
588 | if (hwif->io_ports.ctl_addr && | |
589 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
590 | stat = hwif->tp_ops->read_altstatus(hwif); | |
591 | else | |
592 | /* Note: this may clear a pending IRQ!! */ | |
593 | stat = hwif->tp_ops->read_status(hwif); | |
594 | ||
595 | if (stat & ATA_BUSY) | |
596 | /* drive busy: definitely not interrupting */ | |
597 | return 0; | |
598 | ||
599 | /* drive ready: *might* be interrupting */ | |
600 | return 1; | |
601 | } | |
602 | ||
1da177e4 LT |
603 | /** |
604 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 605 | * @data: timer callback magic (hwif) |
1da177e4 LT |
606 | * |
607 | * An IDE command has timed out before the expected drive return | |
608 | * occurred. At this point we attempt to clean up the current | |
609 | * mess. If the current handler includes an expiry handler then | |
610 | * we invoke the expiry handler, and providing it is happy the | |
611 | * work is done. If that fails we apply generic recovery rules | |
612 | * invoking the handler and checking the drive DMA status. We | |
613 | * have an excessively incestuous relationship with the DMA | |
614 | * logic that wants cleaning up. | |
615 | */ | |
616 | ||
10738ba8 | 617 | void ide_timer_expiry (struct timer_list *t) |
1da177e4 | 618 | { |
10738ba8 | 619 | ide_hwif_t *hwif = from_timer(hwif, t, timer); |
3f649ab7 | 620 | ide_drive_t *drive; |
1da177e4 | 621 | ide_handler_t *handler; |
1da177e4 | 622 | unsigned long flags; |
e0c6dcd8 | 623 | int wait = -1; |
201bffa4 | 624 | int plug_device = 0; |
3f649ab7 | 625 | struct request *rq_in_flight; |
1da177e4 | 626 | |
b65fac32 BZ |
627 | spin_lock_irqsave(&hwif->lock, flags); |
628 | ||
629 | handler = hwif->handler; | |
1da177e4 | 630 | |
b65fac32 | 631 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
632 | /* |
633 | * Either a marginal timeout occurred | |
634 | * (got the interrupt just as timer expired), | |
635 | * or we were "sleeping" to give other devices a chance. | |
636 | * Either way, we don't really want to complain about anything. | |
637 | */ | |
1da177e4 | 638 | } else { |
c38714ed BZ |
639 | ide_expiry_t *expiry = hwif->expiry; |
640 | ide_startstop_t startstop = ide_stopped; | |
641 | ||
b65fac32 | 642 | drive = hwif->cur_dev; |
c38714ed BZ |
643 | |
644 | if (expiry) { | |
645 | wait = expiry(drive); | |
646 | if (wait > 0) { /* continue */ | |
647 | /* reset timer */ | |
648 | hwif->timer.expires = jiffies + wait; | |
649 | hwif->req_gen_timer = hwif->req_gen; | |
650 | add_timer(&hwif->timer); | |
651 | spin_unlock_irqrestore(&hwif->lock, flags); | |
652 | return; | |
295f0004 | 653 | } |
1da177e4 | 654 | } |
c38714ed | 655 | hwif->handler = NULL; |
60c0cd02 | 656 | hwif->expiry = NULL; |
c38714ed BZ |
657 | /* |
658 | * We need to simulate a real interrupt when invoking | |
659 | * the handler() function, which means we need to | |
660 | * globally mask the specific IRQ: | |
661 | */ | |
662 | spin_unlock(&hwif->lock); | |
663 | /* disable_irq_nosync ?? */ | |
664 | disable_irq(hwif->irq); | |
56f0ddad | 665 | |
c38714ed BZ |
666 | if (hwif->polling) { |
667 | startstop = handler(drive); | |
668 | } else if (drive_is_ready(drive)) { | |
669 | if (drive->waiting_for_dma) | |
670 | hwif->dma_ops->dma_lost_irq(drive); | |
53b987d5 SS |
671 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
672 | hwif->port_ops->clear_irq(drive); | |
673 | ||
c38714ed BZ |
674 | printk(KERN_WARNING "%s: lost interrupt\n", |
675 | drive->name); | |
676 | startstop = handler(drive); | |
677 | } else { | |
678 | if (drive->waiting_for_dma) | |
679 | startstop = ide_dma_timeout_retry(drive, wait); | |
680 | else | |
681 | startstop = ide_error(drive, "irq timeout", | |
682 | hwif->tp_ops->read_status(hwif)); | |
683 | } | |
56f0ddad | 684 | /* Disable interrupts again, `handler' might have enabled it */ |
c38714ed BZ |
685 | spin_lock_irq(&hwif->lock); |
686 | enable_irq(hwif->irq); | |
e3b29f05 | 687 | if (startstop == ide_stopped && hwif->polling == 0) { |
8f6205cd TH |
688 | rq_in_flight = hwif->rq; |
689 | hwif->rq = NULL; | |
c38714ed BZ |
690 | ide_unlock_port(hwif); |
691 | plug_device = 1; | |
692 | } | |
1da177e4 | 693 | } |
b65fac32 | 694 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 695 | |
5b31f855 BZ |
696 | if (plug_device) { |
697 | ide_unlock_host(hwif->host); | |
8f6205cd | 698 | ide_requeue_and_plug(drive, rq_in_flight); |
5b31f855 | 699 | } |
1da177e4 LT |
700 | } |
701 | ||
702 | /** | |
703 | * unexpected_intr - handle an unexpected IDE interrupt | |
704 | * @irq: interrupt line | |
bd53cbcc | 705 | * @hwif: port being processed |
1da177e4 LT |
706 | * |
707 | * There's nothing really useful we can do with an unexpected interrupt, | |
708 | * other than reading the status register (to clear it), and logging it. | |
709 | * There should be no way that an irq can happen before we're ready for it, | |
710 | * so we needn't worry much about losing an "important" interrupt here. | |
711 | * | |
712 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
713 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
714 | * looks "good", we just ignore the interrupt completely. | |
715 | * | |
716 | * This routine assumes __cli() is in effect when called. | |
717 | * | |
718 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
719 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
720 | * we could screw up by interfering with a new request being set up for | |
721 | * irq15. | |
722 | * | |
723 | * In reality, this is a non-issue. The new command is not sent unless | |
724 | * the drive is ready to accept one, in which case we know the drive is | |
725 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
726 | * before completing the issuance of any new drive command, so we will not | |
727 | * be accidentally invoked as a result of any valid command completion | |
728 | * interrupt. | |
1da177e4 | 729 | */ |
bd53cbcc BZ |
730 | |
731 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 732 | { |
ae86afae BZ |
733 | u8 stat = hwif->tp_ops->read_status(hwif); |
734 | ||
735 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
736 | /* Try to not flood the console with msgs */ | |
737 | static unsigned long last_msgtime, count; | |
738 | ++count; | |
739 | ||
740 | if (time_after(jiffies, last_msgtime + HZ)) { | |
741 | last_msgtime = jiffies; | |
742 | printk(KERN_ERR "%s: unexpected interrupt, " | |
743 | "status=0x%02x, count=%ld\n", | |
744 | hwif->name, stat, count); | |
1da177e4 | 745 | } |
ae86afae | 746 | } |
1da177e4 LT |
747 | } |
748 | ||
749 | /** | |
750 | * ide_intr - default IDE interrupt handler | |
751 | * @irq: interrupt number | |
ae86afae | 752 | * @dev_id: hwif |
1da177e4 LT |
753 | * @regs: unused weirdness from the kernel irq layer |
754 | * | |
755 | * This is the default IRQ handler for the IDE layer. You should | |
756 | * not need to override it. If you do be aware it is subtle in | |
757 | * places | |
758 | * | |
bd53cbcc | 759 | * hwif is the interface in the group currently performing |
b65fac32 | 760 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
761 | * the IRQ handler to call. As we issue a command the handlers |
762 | * step through multiple states, reassigning the handler to the | |
763 | * next step in the process. Unlike a smart SCSI controller IDE | |
764 | * expects the main processor to sequence the various transfer | |
765 | * stages. We also manage a poll timer to catch up with most | |
766 | * timeout situations. There are still a few where the handlers | |
767 | * don't ever decide to give up. | |
768 | * | |
769 | * The handler eventually returns ide_stopped to indicate the | |
770 | * request completed. At this point we issue the next request | |
b65fac32 | 771 | * on the port and the process begins again. |
1da177e4 | 772 | */ |
b65fac32 | 773 | |
7d12e780 | 774 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 775 | { |
ae86afae | 776 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 777 | struct ide_host *host = hwif->host; |
3f649ab7 | 778 | ide_drive_t *drive; |
1da177e4 | 779 | ide_handler_t *handler; |
ae86afae | 780 | unsigned long flags; |
1da177e4 | 781 | ide_startstop_t startstop; |
3e0e29f7 | 782 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 783 | int plug_device = 0; |
3f649ab7 | 784 | struct request *rq_in_flight; |
1da177e4 | 785 | |
255115fb BZ |
786 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
787 | if (hwif != host->cur_port) | |
ae86afae BZ |
788 | goto out_early; |
789 | } | |
bd53cbcc | 790 | |
b65fac32 | 791 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 792 | |
f4d3ffa5 SS |
793 | if (hwif->port_ops && hwif->port_ops->test_irq && |
794 | hwif->port_ops->test_irq(hwif) == 0) | |
3e0e29f7 | 795 | goto out; |
1da177e4 | 796 | |
b65fac32 BZ |
797 | handler = hwif->handler; |
798 | ||
799 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
800 | /* |
801 | * Not expecting an interrupt from this drive. | |
802 | * That means this could be: | |
803 | * (1) an interrupt from another PCI device | |
804 | * sharing the same PCI INT# as us. | |
805 | * or (2) a drive just entered sleep or standby mode, | |
806 | * and is interrupting to let us know. | |
807 | * or (3) a spurious interrupt of unknown origin. | |
808 | * | |
809 | * For PCI, we cannot tell the difference, | |
810 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 811 | */ |
255115fb | 812 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
813 | /* |
814 | * Probably not a shared PCI interrupt, | |
815 | * so we can safely try to do something about it: | |
816 | */ | |
bd53cbcc | 817 | unexpected_intr(irq, hwif); |
1da177e4 LT |
818 | } else { |
819 | /* | |
820 | * Whack the status register, just in case | |
821 | * we have a leftover pending IRQ. | |
822 | */ | |
374e042c | 823 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 824 | } |
3e0e29f7 | 825 | goto out; |
1da177e4 | 826 | } |
3e0e29f7 | 827 | |
b65fac32 | 828 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
829 | |
830 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
831 | /* |
832 | * This happens regularly when we share a PCI IRQ with | |
833 | * another device. Unfortunately, it can also happen | |
834 | * with some buggy drives that trigger the IRQ before | |
835 | * their status register is up to date. Hopefully we have | |
836 | * enough advance overhead that the latter isn't a problem. | |
837 | */ | |
3e0e29f7 BZ |
838 | goto out; |
839 | ||
b65fac32 | 840 | hwif->handler = NULL; |
60c0cd02 | 841 | hwif->expiry = NULL; |
b65fac32 BZ |
842 | hwif->req_gen++; |
843 | del_timer(&hwif->timer); | |
844 | spin_unlock(&hwif->lock); | |
1da177e4 | 845 | |
bfa7d8e5 BZ |
846 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
847 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 848 | |
97100fc8 | 849 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 850 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 851 | |
1da177e4 LT |
852 | /* service this interrupt, may set handler for next interrupt */ |
853 | startstop = handler(drive); | |
1da177e4 | 854 | |
b65fac32 | 855 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
856 | /* |
857 | * Note that handler() may have set things up for another | |
858 | * interrupt to occur soon, but it cannot happen until | |
859 | * we exit from this routine, because it will be the | |
860 | * same irq as is currently being serviced here, and Linux | |
861 | * won't allow another of the same (on any CPU) until we return. | |
862 | */ | |
e3b29f05 | 863 | if (startstop == ide_stopped && hwif->polling == 0) { |
9600dcf1 | 864 | BUG_ON(hwif->handler); |
8f6205cd TH |
865 | rq_in_flight = hwif->rq; |
866 | hwif->rq = NULL; | |
9600dcf1 BZ |
867 | ide_unlock_port(hwif); |
868 | plug_device = 1; | |
1da177e4 | 869 | } |
3e0e29f7 BZ |
870 | irq_ret = IRQ_HANDLED; |
871 | out: | |
b65fac32 | 872 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 873 | out_early: |
5b31f855 BZ |
874 | if (plug_device) { |
875 | ide_unlock_host(hwif->host); | |
8f6205cd | 876 | ide_requeue_and_plug(drive, rq_in_flight); |
5b31f855 | 877 | } |
201bffa4 | 878 | |
3e0e29f7 | 879 | return irq_ret; |
1da177e4 | 880 | } |
849d7130 | 881 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 882 | |
9f87abe8 BZ |
883 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
884 | { | |
885 | ide_hwif_t *hwif = drive->hwif; | |
886 | u8 buf[4] = { 0 }; | |
887 | ||
888 | while (len > 0) { | |
889 | if (write) | |
374e042c | 890 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 891 | else |
374e042c | 892 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
893 | len -= 4; |
894 | } | |
895 | } | |
896 | EXPORT_SYMBOL_GPL(ide_pad_transfer); | |
60033520 JA |
897 | |
898 | void ide_insert_request_head(ide_drive_t *drive, struct request *rq) | |
899 | { | |
9a6d5488 | 900 | drive->sense_rq_active = true; |
60033520 | 901 | list_add_tail(&rq->queuelist, &drive->rq_list); |
60033520 JA |
902 | kblockd_schedule_work(&drive->rq_work); |
903 | } | |
904 | EXPORT_SYMBOL_GPL(ide_insert_request_head); |