blob: 696525342e9a56977c1d2ac88d72497be5a7e866 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#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>
Jiri Slaby1977f032007-10-18 23:40:25 -070050#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52#include <asm/byteorder.h>
53#include <asm/irq.h>
54#include <asm/uaccess.h>
55#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Adrian Bunka7ff7d42006-02-03 03:04:56 -080057static int __ide_end_request(ide_drive_t *drive, struct request *rq,
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +020058 int uptodate, unsigned int nr_bytes, int dequeue)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
60 int ret = 1;
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010061 int error = 0;
62
63 if (uptodate <= 0)
64 error = uptodate ? uptodate : -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 /*
67 * if failfast is set on a request, override number of sectors and
68 * complete the whole request right now
69 */
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010070 if (blk_noretry_request(rq) && error)
Jens Axboe41e9d342007-07-19 08:13:01 +020071 nr_bytes = rq->hard_nr_sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010073 if (!blk_fs_request(rq) && error && !rq->errors)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 rq->errors = -EIO;
75
76 /*
77 * decide whether to reenable DMA -- 3 is a random magic for now,
78 * if we DMA timeout more than 3 times, just stay in PIO
79 */
80 if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) {
81 drive->state = 0;
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +010082 ide_dma_on(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 }
84
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010085 if (!__blk_end_request(rq, error, nr_bytes)) {
86 if (dequeue)
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +020087 HWGROUP(drive)->rq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 ret = 0;
89 }
Jens Axboe8672d572006-01-09 16:03:35 +010090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return ret;
92}
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94/**
95 * ide_end_request - complete an IDE I/O
96 * @drive: IDE device for the I/O
97 * @uptodate:
98 * @nr_sectors: number of sectors completed
99 *
100 * This is our end_request wrapper function. We complete the I/O
101 * update random number input and dequeue the request, which if
102 * it was tagged may be out of order.
103 */
104
105int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
106{
Jens Axboe41e9d342007-07-19 08:13:01 +0200107 unsigned int nr_bytes = nr_sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 struct request *rq;
109 unsigned long flags;
110 int ret = 1;
111
Jens Axboe8672d572006-01-09 16:03:35 +0100112 /*
113 * room for locking improvements here, the calls below don't
114 * need the queue lock held at all
115 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 spin_lock_irqsave(&ide_lock, flags);
117 rq = HWGROUP(drive)->rq;
118
Jens Axboe41e9d342007-07-19 08:13:01 +0200119 if (!nr_bytes) {
120 if (blk_pc_request(rq))
121 nr_bytes = rq->data_len;
122 else
123 nr_bytes = rq->hard_cur_sectors << 9;
124 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200126 ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 spin_unlock_irqrestore(&ide_lock, flags);
129 return ret;
130}
131EXPORT_SYMBOL(ide_end_request);
132
133/*
134 * Power Management state machine. This one is rather trivial for now,
135 * we should probably add more, like switching back to PIO on suspend
136 * to help some BIOSes, re-do the door locking on resume, etc...
137 */
138
139enum {
140 ide_pm_flush_cache = ide_pm_state_start_suspend,
141 idedisk_pm_standby,
142
Jason Lunz8c2c0112006-10-03 01:14:26 -0700143 idedisk_pm_restore_pio = ide_pm_state_start_resume,
144 idedisk_pm_idle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 ide_pm_restore_dma,
146};
147
148static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
149{
Jens Axboec00895a2006-09-30 20:29:12 +0200150 struct request_pm_state *pm = rq->data;
Jens Axboead3cadd2006-06-13 08:46:57 +0200151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 if (drive->media != ide_disk)
153 return;
154
Jens Axboead3cadd2006-06-13 08:46:57 +0200155 switch (pm->pm_step) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */
Jens Axboead3cadd2006-06-13 08:46:57 +0200157 if (pm->pm_state == PM_EVENT_FREEZE)
158 pm->pm_step = ide_pm_state_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 else
Jens Axboead3cadd2006-06-13 08:46:57 +0200160 pm->pm_step = idedisk_pm_standby;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 break;
162 case idedisk_pm_standby: /* Suspend step 2 (standby) complete */
Jens Axboead3cadd2006-06-13 08:46:57 +0200163 pm->pm_step = ide_pm_state_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 break;
Jason Lunz8c2c0112006-10-03 01:14:26 -0700165 case idedisk_pm_restore_pio: /* Resume step 1 complete */
166 pm->pm_step = idedisk_pm_idle;
167 break;
168 case idedisk_pm_idle: /* Resume step 2 (idle) complete */
Jens Axboead3cadd2006-06-13 08:46:57 +0200169 pm->pm_step = ide_pm_restore_dma;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 break;
171 }
172}
173
174static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
175{
Jens Axboec00895a2006-09-30 20:29:12 +0200176 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 ide_task_t *args = rq->special;
178
179 memset(args, 0, sizeof(*args));
180
Jens Axboead3cadd2006-06-13 08:46:57 +0200181 switch (pm->pm_step) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */
183 if (drive->media != ide_disk)
184 break;
185 /* Not supported? Switch to next step now. */
186 if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) {
187 ide_complete_power_step(drive, rq, 0, 0);
188 return ide_stopped;
189 }
190 if (ide_id_has_flush_cache_ext(drive->id))
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100191 args->tf.command = WIN_FLUSH_CACHE_EXT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 else
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100193 args->tf.command = WIN_FLUSH_CACHE;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100194 goto out_do_tf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 case idedisk_pm_standby: /* Suspend step 2 (standby) */
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100197 args->tf.command = WIN_STANDBYNOW1;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100198 goto out_do_tf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Jason Lunz8c2c0112006-10-03 01:14:26 -0700200 case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200201 ide_set_max_pio(drive);
Bartlomiej Zolnierkiewicz317a46a2007-05-10 00:01:11 +0200202 /*
203 * skip idedisk_pm_idle for ATAPI devices
204 */
205 if (drive->media != ide_disk)
206 pm->pm_step = ide_pm_restore_dma;
207 else
208 ide_complete_power_step(drive, rq, 0, 0);
Jason Lunz8c2c0112006-10-03 01:14:26 -0700209 return ide_stopped;
210
211 case idedisk_pm_idle: /* Resume step 2 (idle) */
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100212 args->tf.command = WIN_IDLEIMMEDIATE;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100213 goto out_do_tf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Jason Lunz8c2c0112006-10-03 01:14:26 -0700215 case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 /*
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200217 * Right now, all we do is call ide_set_dma(drive),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 * we could be smarter and check for current xfer_speed
219 * in struct drive etc...
220 */
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200221 if (drive->hwif->dma_ops == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 break;
Bartlomiej Zolnierkiewicz8987d212007-07-20 01:11:56 +0200223 /*
224 * TODO: respect ->using_dma setting
225 */
Bartlomiej Zolnierkiewicz3608b5d2007-02-17 02:40:26 +0100226 ide_set_dma(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 break;
228 }
Jens Axboead3cadd2006-06-13 08:46:57 +0200229 pm->pm_step = ide_pm_state_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return ide_stopped;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100231
232out_do_tf:
Bartlomiej Zolnierkiewicz657cc1a2008-01-26 20:13:10 +0100233 args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
Bartlomiej Zolnierkiewiczac026ff2008-01-25 22:17:14 +0100234 args->data_phase = TASKFILE_NO_DATA;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100235 return do_rw_taskfile(drive, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
238/**
Alan Coxdbe217a2006-06-25 05:47:44 -0700239 * ide_end_dequeued_request - complete an IDE I/O
240 * @drive: IDE device for the I/O
241 * @uptodate:
242 * @nr_sectors: number of sectors completed
243 *
244 * Complete an I/O that is no longer on the request queue. This
245 * typically occurs when we pull the request and issue a REQUEST_SENSE.
246 * We must still finish the old request but we must not tamper with the
247 * queue in the meantime.
248 *
249 * NOTE: This path does not handle barrier, but barrier is not supported
250 * on ide-cd anyway.
251 */
252
253int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
254 int uptodate, int nr_sectors)
255{
256 unsigned long flags;
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200257 int ret;
Alan Coxdbe217a2006-06-25 05:47:44 -0700258
259 spin_lock_irqsave(&ide_lock, flags);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200260 BUG_ON(!blk_rq_started(rq));
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200261 ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0);
Alan Coxdbe217a2006-06-25 05:47:44 -0700262 spin_unlock_irqrestore(&ide_lock, flags);
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200263
Alan Coxdbe217a2006-06-25 05:47:44 -0700264 return ret;
265}
266EXPORT_SYMBOL_GPL(ide_end_dequeued_request);
267
268
269/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 * ide_complete_pm_request - end the current Power Management request
271 * @drive: target drive
272 * @rq: request
273 *
274 * This function cleans up the current PM request and stops the queue
275 * if necessary.
276 */
277static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq)
278{
279 unsigned long flags;
280
281#ifdef DEBUG_PM
282 printk("%s: completing PM request, %s\n", drive->name,
283 blk_pm_suspend_request(rq) ? "suspend" : "resume");
284#endif
285 spin_lock_irqsave(&ide_lock, flags);
286 if (blk_pm_suspend_request(rq)) {
287 blk_stop_queue(drive->queue);
288 } else {
289 drive->blocked = 0;
290 blk_start_queue(drive->queue);
291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 HWGROUP(drive)->rq = NULL;
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +0100293 if (__blk_end_request(rq, 0, 0))
294 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 spin_unlock_irqrestore(&ide_lock, flags);
296}
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298/**
299 * ide_end_drive_cmd - end an explicit drive command
300 * @drive: command
301 * @stat: status bits
302 * @err: error bits
303 *
304 * Clean up after success/failure of an explicit drive command.
305 * These get thrown onto the queue so they are synchronized with
306 * real I/O operations on the drive.
307 *
308 * In LBA48 mode we have to read the register set twice to get
309 * all the extra information out.
310 */
311
312void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
313{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 unsigned long flags;
315 struct request *rq;
316
317 spin_lock_irqsave(&ide_lock, flags);
318 rq = HWGROUP(drive)->rq;
319 spin_unlock_irqrestore(&ide_lock, flags);
320
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100321 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
Bartlomiej Zolnierkiewicz395d8ef2008-02-11 00:32:14 +0100322 ide_task_t *task = (ide_task_t *)rq->special;
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 if (rq->errors == 0)
Bartlomiej Zolnierkiewicz395d8ef2008-02-11 00:32:14 +0100325 rq->errors = !OK_STAT(stat, READY_STAT, BAD_STAT);
326
327 if (task) {
328 struct ide_taskfile *tf = &task->tf;
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100329
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100330 tf->error = err;
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100331 tf->status = stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Bartlomiej Zolnierkiewicz94cd5b62008-04-28 23:44:40 +0200333 drive->hwif->tf_read(drive, task);
Bartlomiej Zolnierkiewicz395d8ef2008-02-11 00:32:14 +0100334
335 if (task->tf_flags & IDE_TFLAG_DYN)
336 kfree(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 }
338 } else if (blk_pm_request(rq)) {
Jens Axboec00895a2006-09-30 20:29:12 +0200339 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340#ifdef DEBUG_PM
341 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
342 drive->name, rq->pm->pm_step, stat, err);
343#endif
344 ide_complete_power_step(drive, rq, stat, err);
Jens Axboead3cadd2006-06-13 08:46:57 +0200345 if (pm->pm_step == ide_pm_state_completed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 ide_complete_pm_request(drive, rq);
347 return;
348 }
349
350 spin_lock_irqsave(&ide_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 HWGROUP(drive)->rq = NULL;
352 rq->errors = err;
Kiyoshi Ueda3b0e0442008-02-11 00:32:11 +0100353 if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0),
354 blk_rq_bytes(rq))))
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +0100355 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 spin_unlock_irqrestore(&ide_lock, flags);
357}
358
359EXPORT_SYMBOL(ide_end_drive_cmd);
360
361/**
362 * try_to_flush_leftover_data - flush junk
363 * @drive: drive to flush
364 *
365 * try_to_flush_leftover_data() is invoked in response to a drive
366 * unexpectedly having its DRQ_STAT bit set. As an alternative to
367 * resetting the drive, this routine tries to clear the condition
368 * by read a sector's worth of data from the drive. Of course,
369 * this may not help if the drive is *waiting* for data from *us*.
370 */
371static void try_to_flush_leftover_data (ide_drive_t *drive)
372{
373 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
374
375 if (drive->media != ide_disk)
376 return;
377 while (i > 0) {
378 u32 buffer[16];
379 u32 wcount = (i > 16) ? 16 : i;
380
381 i -= wcount;
Bartlomiej Zolnierkiewicz9567b342008-04-28 23:44:36 +0200382 drive->hwif->input_data(drive, NULL, buffer, wcount * 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384}
385
386static void ide_kill_rq(ide_drive_t *drive, struct request *rq)
387{
388 if (rq->rq_disk) {
389 ide_driver_t *drv;
390
391 drv = *(ide_driver_t **)rq->rq_disk->private_data;
392 drv->end_request(drive, 0, 0);
393 } else
394 ide_end_request(drive, 0, 0);
395}
396
397static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
398{
399 ide_hwif_t *hwif = drive->hwif;
400
401 if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
402 /* other bits are useless when BUSY */
403 rq->errors |= ERROR_RESET;
404 } else if (stat & ERR_STAT) {
405 /* err has different meaning on cdrom and tape */
406 if (err == ABRT_ERR) {
407 if (drive->select.b.lba &&
408 /* some newer drives don't support WIN_SPECIFY */
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +0200409 hwif->INB(hwif->io_ports.command_addr) ==
Bartlomiej Zolnierkiewicz23579a22008-04-18 00:46:26 +0200410 WIN_SPECIFY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 return ide_stopped;
412 } else if ((err & BAD_CRC) == BAD_CRC) {
413 /* UDMA crc error, just retry the operation */
414 drive->crc_count++;
415 } else if (err & (BBD_ERR | ECC_ERR)) {
416 /* retries won't help these */
417 rq->errors = ERROR_MAX;
418 } else if (err & TRK0_ERR) {
419 /* help it find track zero */
420 rq->errors |= ERROR_RECAL;
421 }
422 }
423
Bartlomiej Zolnierkiewiczed67b922007-10-19 00:30:10 +0200424 if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ &&
425 (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 try_to_flush_leftover_data(drive);
427
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200428 if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 ide_kill_rq(drive, rq);
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200430 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 }
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200432
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100433 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200434 rq->errors |= ERROR_RESET;
435
436 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
437 ++rq->errors;
438 return ide_do_reset(drive);
439 }
440
441 if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
442 drive->special.b.recalibrate = 1;
443
444 ++rq->errors;
445
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return ide_stopped;
447}
448
449static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
450{
451 ide_hwif_t *hwif = drive->hwif;
452
453 if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
454 /* other bits are useless when BUSY */
455 rq->errors |= ERROR_RESET;
456 } else {
457 /* add decoding error stuff */
458 }
459
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +0100460 if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 /* force an abort */
Bartlomiej Zolnierkiewicz32b3fe42008-04-28 23:44:38 +0200462 hwif->OUTBSYNC(drive, WIN_IDLEIMMEDIATE,
463 hwif->io_ports.command_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465 if (rq->errors >= ERROR_MAX) {
466 ide_kill_rq(drive, rq);
467 } else {
468 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
469 ++rq->errors;
470 return ide_do_reset(drive);
471 }
472 ++rq->errors;
473 }
474
475 return ide_stopped;
476}
477
478ide_startstop_t
479__ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
480{
481 if (drive->media == ide_disk)
482 return ide_ata_error(drive, rq, stat, err);
483 return ide_atapi_error(drive, rq, stat, err);
484}
485
486EXPORT_SYMBOL_GPL(__ide_error);
487
488/**
489 * ide_error - handle an error on the IDE
490 * @drive: drive the error occurred on
491 * @msg: message to report
492 * @stat: status bits
493 *
494 * ide_error() takes action based on the error returned by the drive.
495 * For normal I/O that may well include retries. We deal with
496 * both new-style (taskfile) and old style command handling here.
497 * In the case of taskfile command handling there is work left to
498 * do
499 */
500
501ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
502{
503 struct request *rq;
504 u8 err;
505
506 err = ide_dump_status(drive, msg, stat);
507
508 if ((rq = HWGROUP(drive)->rq) == NULL)
509 return ide_stopped;
510
511 /* retry only "normal" I/O: */
Jens Axboe4aff5e22006-08-10 08:44:47 +0200512 if (!blk_fs_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 rq->errors = 1;
514 ide_end_drive_cmd(drive, stat, err);
515 return ide_stopped;
516 }
517
518 if (rq->rq_disk) {
519 ide_driver_t *drv;
520
521 drv = *(ide_driver_t **)rq->rq_disk->private_data;
522 return drv->error(drive, rq, stat, err);
523 } else
524 return __ide_error(drive, rq, stat, err);
525}
526
527EXPORT_SYMBOL_GPL(ide_error);
528
529ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq)
530{
531 if (drive->media != ide_disk)
532 rq->errors |= ERROR_RESET;
533
534 ide_kill_rq(drive, rq);
535
536 return ide_stopped;
537}
538
539EXPORT_SYMBOL_GPL(__ide_abort);
540
541/**
Adrian Bunk338cec32005-09-10 00:26:54 -0700542 * ide_abort - abort pending IDE operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * @drive: drive the error occurred on
544 * @msg: message to report
545 *
546 * ide_abort kills and cleans up when we are about to do a
547 * host initiated reset on active commands. Longer term we
548 * want handlers to have sensible abort handling themselves
549 *
550 * This differs fundamentally from ide_error because in
551 * this case the command is doing just fine when we
552 * blow it away.
553 */
554
555ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg)
556{
557 struct request *rq;
558
559 if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
560 return ide_stopped;
561
562 /* retry only "normal" I/O: */
Jens Axboe4aff5e22006-08-10 08:44:47 +0200563 if (!blk_fs_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 rq->errors = 1;
565 ide_end_drive_cmd(drive, BUSY_STAT, 0);
566 return ide_stopped;
567 }
568
569 if (rq->rq_disk) {
570 ide_driver_t *drv;
571
572 drv = *(ide_driver_t **)rq->rq_disk->private_data;
573 return drv->abort(drive, rq);
574 } else
575 return __ide_abort(drive, rq);
576}
577
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100578static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100580 tf->nsect = drive->sect;
581 tf->lbal = drive->sect;
582 tf->lbam = drive->cyl;
583 tf->lbah = drive->cyl >> 8;
584 tf->device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA;
585 tf->command = WIN_SPECIFY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586}
587
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100588static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100590 tf->nsect = drive->sect;
591 tf->command = WIN_RESTORE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100594static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100596 tf->nsect = drive->mult_req;
597 tf->command = WIN_SETMULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
600static ide_startstop_t ide_disk_special(ide_drive_t *drive)
601{
602 special_t *s = &drive->special;
603 ide_task_t args;
604
605 memset(&args, 0, sizeof(ide_task_t));
Bartlomiej Zolnierkiewiczac026ff2008-01-25 22:17:14 +0100606 args.data_phase = TASKFILE_NO_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
608 if (s->b.set_geometry) {
609 s->b.set_geometry = 0;
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100610 ide_tf_set_specify_cmd(drive, &args.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 } else if (s->b.recalibrate) {
612 s->b.recalibrate = 0;
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100613 ide_tf_set_restore_cmd(drive, &args.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 } else if (s->b.set_multmode) {
615 s->b.set_multmode = 0;
616 if (drive->mult_req > drive->id->max_multsect)
617 drive->mult_req = drive->id->max_multsect;
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100618 ide_tf_set_setmult_cmd(drive, &args.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 } else if (s->all) {
620 int special = s->all;
621 s->all = 0;
622 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
623 return ide_stopped;
624 }
625
Bartlomiej Zolnierkiewicz657cc1a2008-01-26 20:13:10 +0100626 args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE |
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100627 IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 do_rw_taskfile(drive, &args);
630
631 return ide_started;
632}
633
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200634/*
635 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
636 */
637static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
638{
639 switch (req_pio) {
640 case 202:
641 case 201:
642 case 200:
643 case 102:
644 case 101:
645 case 100:
646 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
647 case 9:
648 case 8:
649 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
650 case 7:
651 case 6:
652 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
653 default:
654 return 0;
655 }
656}
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658/**
659 * do_special - issue some special commands
660 * @drive: drive the command is for
661 *
662 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
663 * commands to a drive. It used to do much more, but has been scaled
664 * back.
665 */
666
667static ide_startstop_t do_special (ide_drive_t *drive)
668{
669 special_t *s = &drive->special;
670
671#ifdef DEBUG
672 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
673#endif
674 if (s->b.set_tune) {
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200675 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200676 const struct ide_port_ops *port_ops = hwif->port_ops;
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200677 u8 req_pio = drive->tune_req;
678
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 s->b.set_tune = 0;
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200680
681 if (set_pio_mode_abuse(drive->hwif, req_pio)) {
Bartlomiej Zolnierkiewiczd393aa02007-10-20 00:32:36 +0200682 /*
683 * take ide_lock for drive->[no_]unmask/[no_]io_32bit
684 */
685 if (req_pio == 8 || req_pio == 9) {
686 unsigned long flags;
687
688 spin_lock_irqsave(&ide_lock, flags);
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200689 port_ops->set_pio_mode(drive, req_pio);
Bartlomiej Zolnierkiewiczd393aa02007-10-20 00:32:36 +0200690 spin_unlock_irqrestore(&ide_lock, flags);
691 } else
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200692 port_ops->set_pio_mode(drive, req_pio);
Bartlomiej Zolnierkiewiczaedea592007-10-13 17:47:50 +0200693 } else {
694 int keep_dma = drive->using_dma;
695
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200696 ide_set_pio(drive, req_pio);
697
Bartlomiej Zolnierkiewiczaedea592007-10-13 17:47:50 +0200698 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
699 if (keep_dma)
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +0100700 ide_dma_on(drive);
Bartlomiej Zolnierkiewiczaedea592007-10-13 17:47:50 +0200701 }
702 }
703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 return ide_stopped;
705 } else {
706 if (drive->media == ide_disk)
707 return ide_disk_special(drive);
708
709 s->all = 0;
710 drive->mult_req = 0;
711 return ide_stopped;
712 }
713}
714
715void ide_map_sg(ide_drive_t *drive, struct request *rq)
716{
717 ide_hwif_t *hwif = drive->hwif;
718 struct scatterlist *sg = hwif->sg_table;
719
720 if (hwif->sg_mapped) /* needed by ide-scsi */
721 return;
722
Jens Axboe4aff5e22006-08-10 08:44:47 +0200723 if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
725 } else {
726 sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
727 hwif->sg_nents = 1;
728 }
729}
730
731EXPORT_SYMBOL_GPL(ide_map_sg);
732
733void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq)
734{
735 ide_hwif_t *hwif = drive->hwif;
736
737 hwif->nsect = hwif->nleft = rq->nr_sectors;
Jens Axboe55c16a72007-07-25 08:13:56 +0200738 hwif->cursg_ofs = 0;
739 hwif->cursg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
742EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
743
744/**
745 * execute_drive_command - issue special drive command
Adrian Bunk338cec32005-09-10 00:26:54 -0700746 * @drive: the drive to issue the command on
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 * @rq: the request structure holding the command
748 *
749 * execute_drive_cmd() issues a special drive command, usually
750 * initiated by ioctl() from the external hdparm program. The
751 * command can be a drive command, drive task or taskfile
752 * operation. Weirdly you can call it with NULL to wait for
753 * all commands to finish. Don't do this as that is due to change
754 */
755
756static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
757 struct request *rq)
758{
759 ide_hwif_t *hwif = HWIF(drive);
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100760 ide_task_t *task = rq->special;
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100761
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100762 if (task) {
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100763 hwif->data_phase = task->data_phase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765 switch (hwif->data_phase) {
766 case TASKFILE_MULTI_OUT:
767 case TASKFILE_OUT:
768 case TASKFILE_MULTI_IN:
769 case TASKFILE_IN:
770 ide_init_sg_cmd(drive, rq);
771 ide_map_sg(drive, rq);
772 default:
773 break;
774 }
775
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100776 return do_rw_taskfile(drive, task);
777 }
778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 /*
780 * NULL is actually a valid way of waiting for
781 * all current requests to be flushed from the queue.
782 */
783#ifdef DEBUG
784 printk("%s: DRIVE_CMD (null)\n", drive->name);
785#endif
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100786 ide_end_drive_cmd(drive, ide_read_status(drive), ide_read_error(drive));
787
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 return ide_stopped;
789}
790
Jens Axboead3cadd2006-06-13 08:46:57 +0200791static void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
792{
Jens Axboec00895a2006-09-30 20:29:12 +0200793 struct request_pm_state *pm = rq->data;
Jens Axboead3cadd2006-06-13 08:46:57 +0200794
795 if (blk_pm_suspend_request(rq) &&
796 pm->pm_step == ide_pm_state_start_suspend)
797 /* Mark drive blocked when starting the suspend sequence. */
798 drive->blocked = 1;
799 else if (blk_pm_resume_request(rq) &&
800 pm->pm_step == ide_pm_state_start_resume) {
801 /*
802 * The first thing we do on wakeup is to wait for BSY bit to
803 * go away (with a looong timeout) as a drive on this hwif may
804 * just be POSTing itself.
805 * We do that before even selecting as the "other" device on
806 * the bus may be broken enough to walk on our toes at this
807 * point.
808 */
809 int rc;
810#ifdef DEBUG_PM
811 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
812#endif
813 rc = ide_wait_not_busy(HWIF(drive), 35000);
814 if (rc)
815 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
816 SELECT_DRIVE(drive);
Bartlomiej Zolnierkiewicz81ca6912008-01-26 20:13:08 +0100817 ide_set_irq(drive, 1);
Al Boldi178184b2006-06-26 00:26:13 -0700818 rc = ide_wait_not_busy(HWIF(drive), 100000);
Jens Axboead3cadd2006-06-13 08:46:57 +0200819 if (rc)
820 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
821 }
822}
823
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824/**
825 * start_request - start of I/O and command issuing for IDE
826 *
827 * start_request() initiates handling of a new I/O request. It
828 * accepts commands and I/O (read/write) requests. It also does
829 * the final remapping for weird stuff like EZDrive. Once
830 * device mapper can work sector level the EZDrive stuff can go away
831 *
832 * FIXME: this function needs a rename
833 */
834
835static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
836{
837 ide_startstop_t startstop;
838 sector_t block;
839
Jens Axboe4aff5e22006-08-10 08:44:47 +0200840 BUG_ON(!blk_rq_started(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
842#ifdef DEBUG
843 printk("%s: start_request: current=0x%08lx\n",
844 HWIF(drive)->name, (unsigned long) rq);
845#endif
846
847 /* bail early if we've exceeded max_failures */
848 if (drive->max_failures && (drive->failures > drive->max_failures)) {
Aristeu Rozanskib5e1a4e2008-01-25 22:17:04 +0100849 rq->cmd_flags |= REQ_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 goto kill_rq;
851 }
852
853 block = rq->sector;
854 if (blk_fs_request(rq) &&
855 (drive->media == ide_disk || drive->media == ide_floppy)) {
856 block += drive->sect0;
857 }
858 /* Yecch - this will shift the entire interval,
859 possibly killing some innocent following sector */
860 if (block == 0 && drive->remap_0_to_1 == 1)
861 block = 1; /* redirect MBR access to EZ-Drive partn table */
862
Jens Axboead3cadd2006-06-13 08:46:57 +0200863 if (blk_pm_request(rq))
864 ide_check_pm_state(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
866 SELECT_DRIVE(drive);
867 if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
868 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
869 return startstop;
870 }
871 if (!drive->special.all) {
872 ide_driver_t *drv;
873
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200874 /*
875 * We reset the drive so we need to issue a SETFEATURES.
876 * Do it _after_ do_special() restored device parameters.
877 */
878 if (drive->current_speed == 0xff)
879 ide_config_drive_speed(drive, drive->desired_speed);
880
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100881 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 return execute_drive_cmd(drive, rq);
883 else if (blk_pm_request(rq)) {
Jens Axboec00895a2006-09-30 20:29:12 +0200884 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885#ifdef DEBUG_PM
886 printk("%s: start_power_step(step: %d)\n",
887 drive->name, rq->pm->pm_step);
888#endif
889 startstop = ide_start_power_step(drive, rq);
890 if (startstop == ide_stopped &&
Jens Axboead3cadd2006-06-13 08:46:57 +0200891 pm->pm_step == ide_pm_state_completed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 ide_complete_pm_request(drive, rq);
893 return startstop;
894 }
895
896 drv = *(ide_driver_t **)rq->rq_disk->private_data;
897 return drv->do_request(drive, rq, block);
898 }
899 return do_special(drive);
900kill_rq:
901 ide_kill_rq(drive, rq);
902 return ide_stopped;
903}
904
905/**
906 * ide_stall_queue - pause an IDE device
907 * @drive: drive to stall
908 * @timeout: time to stall for (jiffies)
909 *
910 * ide_stall_queue() can be used by a drive to give excess bandwidth back
911 * to the hwgroup by sleeping for timeout jiffies.
912 */
913
914void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
915{
916 if (timeout > WAIT_WORSTCASE)
917 timeout = WAIT_WORSTCASE;
918 drive->sleep = timeout + jiffies;
919 drive->sleeping = 1;
920}
921
922EXPORT_SYMBOL(ide_stall_queue);
923
924#define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
925
926/**
927 * choose_drive - select a drive to service
928 * @hwgroup: hardware group to select on
929 *
930 * choose_drive() selects the next drive which will be serviced.
931 * This is necessary because the IDE layer can't issue commands
932 * to both drives on the same cable, unlike SCSI.
933 */
934
935static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
936{
937 ide_drive_t *drive, *best;
938
939repeat:
940 best = NULL;
941 drive = hwgroup->drive;
942
943 /*
944 * drive is doing pre-flush, ordered write, post-flush sequence. even
945 * though that is 3 requests, it must be seen as a single transaction.
946 * we must not preempt this drive until that is complete
947 */
948 if (blk_queue_flushing(drive->queue)) {
949 /*
950 * small race where queue could get replugged during
951 * the 3-request flush cycle, just yank the plug since
952 * we want it to finish asap
953 */
954 blk_remove_plug(drive->queue);
955 return drive;
956 }
957
958 do {
959 if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep))
960 && !elv_queue_empty(drive->queue)) {
961 if (!best
962 || (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep)))
963 || (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best))))
964 {
965 if (!blk_queue_plugged(drive->queue))
966 best = drive;
967 }
968 }
969 } while ((drive = drive->next) != hwgroup->drive);
970 if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
971 long t = (signed long)(WAKEUP(best) - jiffies);
972 if (t >= WAIT_MIN_SLEEP) {
973 /*
974 * We *may* have some time to spare, but first let's see if
975 * someone can potentially benefit from our nice mood today..
976 */
977 drive = best->next;
978 do {
979 if (!drive->sleeping
980 && time_before(jiffies - best->service_time, WAKEUP(drive))
981 && time_before(WAKEUP(drive), jiffies + t))
982 {
983 ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP));
984 goto repeat;
985 }
986 } while ((drive = drive->next) != best);
987 }
988 }
989 return best;
990}
991
992/*
993 * Issue a new request to a drive from hwgroup
994 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
995 *
996 * A hwgroup is a serialized group of IDE interfaces. Usually there is
997 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
998 * may have both interfaces in a single hwgroup to "serialize" access.
999 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
1000 * together into one hwgroup for serialized access.
1001 *
1002 * Note also that several hwgroups can end up sharing a single IRQ,
1003 * possibly along with many other devices. This is especially common in
1004 * PCI-based systems with off-board IDE controller cards.
1005 *
1006 * The IDE driver uses the single global ide_lock spinlock to protect
1007 * access to the request queues, and to protect the hwgroup->busy flag.
1008 *
1009 * The first thread into the driver for a particular hwgroup sets the
1010 * hwgroup->busy flag to indicate that this hwgroup is now active,
1011 * and then initiates processing of the top request from the request queue.
1012 *
1013 * Other threads attempting entry notice the busy setting, and will simply
1014 * queue their new requests and exit immediately. Note that hwgroup->busy
1015 * remains set even when the driver is merely awaiting the next interrupt.
1016 * Thus, the meaning is "this hwgroup is busy processing a request".
1017 *
1018 * When processing of a request completes, the completing thread or IRQ-handler
1019 * will start the next request from the queue. If no more work remains,
1020 * the driver will clear the hwgroup->busy flag and exit.
1021 *
1022 * The ide_lock (spinlock) is used to protect all access to the
1023 * hwgroup->busy flag, but is otherwise not needed for most processing in
1024 * the driver. This makes the driver much more friendlier to shared IRQs
1025 * than previous designs, while remaining 100% (?) SMP safe and capable.
1026 */
1027static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
1028{
1029 ide_drive_t *drive;
1030 ide_hwif_t *hwif;
1031 struct request *rq;
1032 ide_startstop_t startstop;
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001033 int loops = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035 /* for atari only: POSSIBLY BROKEN HERE(?) */
1036 ide_get_lock(ide_intr, hwgroup);
1037
1038 /* caller must own ide_lock */
1039 BUG_ON(!irqs_disabled());
1040
1041 while (!hwgroup->busy) {
1042 hwgroup->busy = 1;
1043 drive = choose_drive(hwgroup);
1044 if (drive == NULL) {
1045 int sleeping = 0;
1046 unsigned long sleep = 0; /* shut up, gcc */
1047 hwgroup->rq = NULL;
1048 drive = hwgroup->drive;
1049 do {
1050 if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) {
1051 sleeping = 1;
1052 sleep = drive->sleep;
1053 }
1054 } while ((drive = drive->next) != hwgroup->drive);
1055 if (sleeping) {
1056 /*
1057 * Take a short snooze, and then wake up this hwgroup again.
1058 * This gives other hwgroups on the same a chance to
1059 * play fairly with us, just in case there are big differences
1060 * in relative throughputs.. don't want to hog the cpu too much.
1061 */
1062 if (time_before(sleep, jiffies + WAIT_MIN_SLEEP))
1063 sleep = jiffies + WAIT_MIN_SLEEP;
1064#if 1
1065 if (timer_pending(&hwgroup->timer))
1066 printk(KERN_CRIT "ide_set_handler: timer already active\n");
1067#endif
1068 /* so that ide_timer_expiry knows what to do */
1069 hwgroup->sleeping = 1;
Suleiman Souhlal23450312007-04-10 22:38:37 +02001070 hwgroup->req_gen_timer = hwgroup->req_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 mod_timer(&hwgroup->timer, sleep);
1072 /* we purposely leave hwgroup->busy==1
1073 * while sleeping */
1074 } else {
1075 /* Ugly, but how can we sleep for the lock
1076 * otherwise? perhaps from tq_disk?
1077 */
1078
1079 /* for atari only */
1080 ide_release_lock();
1081 hwgroup->busy = 0;
1082 }
1083
1084 /* no more work for this hwgroup (for now) */
1085 return;
1086 }
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001087 again:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 hwif = HWIF(drive);
Bartlomiej Zolnierkiewicz81ca6912008-01-26 20:13:08 +01001089 if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) {
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +01001090 /*
1091 * set nIEN for previous hwif, drives in the
1092 * quirk_list may not like intr setups/cleanups
1093 */
1094 if (drive->quirk_list != 1)
Bartlomiej Zolnierkiewicz81ca6912008-01-26 20:13:08 +01001095 ide_set_irq(drive, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 }
1097 hwgroup->hwif = hwif;
1098 hwgroup->drive = drive;
1099 drive->sleeping = 0;
1100 drive->service_start = jiffies;
1101
1102 if (blk_queue_plugged(drive->queue)) {
1103 printk(KERN_ERR "ide: huh? queue was plugged!\n");
1104 break;
1105 }
1106
1107 /*
1108 * we know that the queue isn't empty, but this can happen
1109 * if the q->prep_rq_fn() decides to kill a request
1110 */
1111 rq = elv_next_request(drive->queue);
1112 if (!rq) {
1113 hwgroup->busy = 0;
1114 break;
1115 }
1116
1117 /*
1118 * Sanity: don't accept a request that isn't a PM request
1119 * if we are currently power managed. This is very important as
1120 * blk_stop_queue() doesn't prevent the elv_next_request()
1121 * above to return us whatever is in the queue. Since we call
1122 * ide_do_request() ourselves, we end up taking requests while
1123 * the queue is blocked...
1124 *
1125 * We let requests forced at head of queue with ide-preempt
1126 * though. I hope that doesn't happen too much, hopefully not
1127 * unless the subdriver triggers such a thing in its own PM
1128 * state machine.
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001129 *
1130 * We count how many times we loop here to make sure we service
1131 * all drives in the hwgroup without looping for ever
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 */
Jens Axboe4aff5e22006-08-10 08:44:47 +02001133 if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) {
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001134 drive = drive->next ? drive->next : hwgroup->drive;
1135 if (loops++ < 4 && !blk_queue_plugged(drive->queue))
1136 goto again;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 /* We clear busy, there should be no pending ATA command at this point. */
1138 hwgroup->busy = 0;
1139 break;
1140 }
1141
1142 hwgroup->rq = rq;
1143
1144 /*
1145 * Some systems have trouble with IDE IRQs arriving while
1146 * the driver is still setting things up. So, here we disable
1147 * the IRQ used by this interface while the request is being started.
1148 * This may look bad at first, but pretty much the same thing
1149 * happens anyway when any interrupt comes in, IDE or otherwise
1150 * -- the kernel masks the IRQ while it is being handled.
1151 */
1152 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
1153 disable_irq_nosync(hwif->irq);
1154 spin_unlock(&ide_lock);
Ingo Molnar366c7f52006-07-03 00:25:25 -07001155 local_irq_enable_in_hardirq();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 /* allow other IRQs while we start this request */
1157 startstop = start_request(drive, rq);
1158 spin_lock_irq(&ide_lock);
1159 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
1160 enable_irq(hwif->irq);
1161 if (startstop == ide_stopped)
1162 hwgroup->busy = 0;
1163 }
1164}
1165
1166/*
1167 * Passes the stuff to ide_do_request
1168 */
Jens Axboe165125e2007-07-24 09:28:11 +02001169void do_ide_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170{
1171 ide_drive_t *drive = q->queuedata;
1172
1173 ide_do_request(HWGROUP(drive), IDE_NO_IRQ);
1174}
1175
1176/*
1177 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1178 * retry the current request in pio mode instead of risking tossing it
1179 * all away
1180 */
1181static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
1182{
1183 ide_hwif_t *hwif = HWIF(drive);
1184 struct request *rq;
1185 ide_startstop_t ret = ide_stopped;
1186
1187 /*
1188 * end current dma transaction
1189 */
1190
1191 if (error < 0) {
1192 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +02001193 (void)hwif->dma_ops->dma_end(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 ret = ide_error(drive, "dma timeout error",
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001195 ide_read_status(drive));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 } else {
1197 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +02001198 hwif->dma_ops->dma_timeout(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 }
1200
1201 /*
1202 * disable dma for now, but remember that we did so because of
1203 * a timeout -- we'll reenable after we finish this next request
1204 * (or rather the first chunk of it) in pio.
1205 */
1206 drive->retry_pio++;
1207 drive->state = DMA_PIO_RETRY;
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +01001208 ide_dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209
1210 /*
1211 * un-busy drive etc (hwgroup->busy is cleared on return) and
1212 * make sure request is sane
1213 */
1214 rq = HWGROUP(drive)->rq;
Hua Zhongce42f192006-10-03 01:14:15 -07001215
1216 if (!rq)
1217 goto out;
1218
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 HWGROUP(drive)->rq = NULL;
1220
1221 rq->errors = 0;
1222
1223 if (!rq->bio)
1224 goto out;
1225
1226 rq->sector = rq->bio->bi_sector;
1227 rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
1228 rq->hard_cur_sectors = rq->current_nr_sectors;
1229 rq->buffer = bio_data(rq->bio);
1230out:
1231 return ret;
1232}
1233
1234/**
1235 * ide_timer_expiry - handle lack of an IDE interrupt
1236 * @data: timer callback magic (hwgroup)
1237 *
1238 * An IDE command has timed out before the expected drive return
1239 * occurred. At this point we attempt to clean up the current
1240 * mess. If the current handler includes an expiry handler then
1241 * we invoke the expiry handler, and providing it is happy the
1242 * work is done. If that fails we apply generic recovery rules
1243 * invoking the handler and checking the drive DMA status. We
1244 * have an excessively incestuous relationship with the DMA
1245 * logic that wants cleaning up.
1246 */
1247
1248void ide_timer_expiry (unsigned long data)
1249{
1250 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1251 ide_handler_t *handler;
1252 ide_expiry_t *expiry;
1253 unsigned long flags;
1254 unsigned long wait = -1;
1255
1256 spin_lock_irqsave(&ide_lock, flags);
1257
Suleiman Souhlal23450312007-04-10 22:38:37 +02001258 if (((handler = hwgroup->handler) == NULL) ||
1259 (hwgroup->req_gen != hwgroup->req_gen_timer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 /*
1261 * Either a marginal timeout occurred
1262 * (got the interrupt just as timer expired),
1263 * or we were "sleeping" to give other devices a chance.
1264 * Either way, we don't really want to complain about anything.
1265 */
1266 if (hwgroup->sleeping) {
1267 hwgroup->sleeping = 0;
1268 hwgroup->busy = 0;
1269 }
1270 } else {
1271 ide_drive_t *drive = hwgroup->drive;
1272 if (!drive) {
1273 printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n");
1274 hwgroup->handler = NULL;
1275 } else {
1276 ide_hwif_t *hwif;
1277 ide_startstop_t startstop = ide_stopped;
1278 if (!hwgroup->busy) {
1279 hwgroup->busy = 1; /* paranoia */
1280 printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
1281 }
1282 if ((expiry = hwgroup->expiry) != NULL) {
1283 /* continue */
1284 if ((wait = expiry(drive)) > 0) {
1285 /* reset timer */
1286 hwgroup->timer.expires = jiffies + wait;
Suleiman Souhlal23450312007-04-10 22:38:37 +02001287 hwgroup->req_gen_timer = hwgroup->req_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 add_timer(&hwgroup->timer);
1289 spin_unlock_irqrestore(&ide_lock, flags);
1290 return;
1291 }
1292 }
1293 hwgroup->handler = NULL;
1294 /*
1295 * We need to simulate a real interrupt when invoking
1296 * the handler() function, which means we need to
1297 * globally mask the specific IRQ:
1298 */
1299 spin_unlock(&ide_lock);
1300 hwif = HWIF(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 /* disable_irq_nosync ?? */
1302 disable_irq(hwif->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 /* local CPU only,
1304 * as if we were handling an interrupt */
1305 local_irq_disable();
1306 if (hwgroup->polling) {
1307 startstop = handler(drive);
1308 } else if (drive_is_ready(drive)) {
1309 if (drive->waiting_for_dma)
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +02001310 hwif->dma_ops->dma_lost_irq(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 (void)ide_ack_intr(hwif);
1312 printk(KERN_WARNING "%s: lost interrupt\n", drive->name);
1313 startstop = handler(drive);
1314 } else {
1315 if (drive->waiting_for_dma) {
1316 startstop = ide_dma_timeout_retry(drive, wait);
1317 } else
1318 startstop =
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001319 ide_error(drive, "irq timeout",
1320 ide_read_status(drive));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 }
1322 drive->service_time = jiffies - drive->service_start;
1323 spin_lock_irq(&ide_lock);
1324 enable_irq(hwif->irq);
1325 if (startstop == ide_stopped)
1326 hwgroup->busy = 0;
1327 }
1328 }
1329 ide_do_request(hwgroup, IDE_NO_IRQ);
1330 spin_unlock_irqrestore(&ide_lock, flags);
1331}
1332
1333/**
1334 * unexpected_intr - handle an unexpected IDE interrupt
1335 * @irq: interrupt line
1336 * @hwgroup: hwgroup being processed
1337 *
1338 * There's nothing really useful we can do with an unexpected interrupt,
1339 * other than reading the status register (to clear it), and logging it.
1340 * There should be no way that an irq can happen before we're ready for it,
1341 * so we needn't worry much about losing an "important" interrupt here.
1342 *
1343 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1344 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1345 * looks "good", we just ignore the interrupt completely.
1346 *
1347 * This routine assumes __cli() is in effect when called.
1348 *
1349 * If an unexpected interrupt happens on irq15 while we are handling irq14
1350 * and if the two interfaces are "serialized" (CMD640), then it looks like
1351 * we could screw up by interfering with a new request being set up for
1352 * irq15.
1353 *
1354 * In reality, this is a non-issue. The new command is not sent unless
1355 * the drive is ready to accept one, in which case we know the drive is
1356 * not trying to interrupt us. And ide_set_handler() is always invoked
1357 * before completing the issuance of any new drive command, so we will not
1358 * be accidentally invoked as a result of any valid command completion
1359 * interrupt.
1360 *
1361 * Note that we must walk the entire hwgroup here. We know which hwif
1362 * is doing the current command, but we don't know which hwif burped
1363 * mysteriously.
1364 */
1365
1366static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1367{
1368 u8 stat;
1369 ide_hwif_t *hwif = hwgroup->hwif;
1370
1371 /*
1372 * handle the unexpected interrupt
1373 */
1374 do {
1375 if (hwif->irq == irq) {
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +02001376 stat = hwif->INB(hwif->io_ports.status_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
1378 /* Try to not flood the console with msgs */
1379 static unsigned long last_msgtime, count;
1380 ++count;
1381 if (time_after(jiffies, last_msgtime + HZ)) {
1382 last_msgtime = jiffies;
1383 printk(KERN_ERR "%s%s: unexpected interrupt, "
1384 "status=0x%02x, count=%ld\n",
1385 hwif->name,
1386 (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
1387 }
1388 }
1389 }
1390 } while ((hwif = hwif->next) != hwgroup->hwif);
1391}
1392
1393/**
1394 * ide_intr - default IDE interrupt handler
1395 * @irq: interrupt number
1396 * @dev_id: hwif group
1397 * @regs: unused weirdness from the kernel irq layer
1398 *
1399 * This is the default IRQ handler for the IDE layer. You should
1400 * not need to override it. If you do be aware it is subtle in
1401 * places
1402 *
1403 * hwgroup->hwif is the interface in the group currently performing
1404 * a command. hwgroup->drive is the drive and hwgroup->handler is
1405 * the IRQ handler to call. As we issue a command the handlers
1406 * step through multiple states, reassigning the handler to the
1407 * next step in the process. Unlike a smart SCSI controller IDE
1408 * expects the main processor to sequence the various transfer
1409 * stages. We also manage a poll timer to catch up with most
1410 * timeout situations. There are still a few where the handlers
1411 * don't ever decide to give up.
1412 *
1413 * The handler eventually returns ide_stopped to indicate the
1414 * request completed. At this point we issue the next request
1415 * on the hwgroup and the process begins again.
1416 */
1417
David Howells7d12e782006-10-05 14:55:46 +01001418irqreturn_t ide_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419{
1420 unsigned long flags;
1421 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
1422 ide_hwif_t *hwif;
1423 ide_drive_t *drive;
1424 ide_handler_t *handler;
1425 ide_startstop_t startstop;
1426
1427 spin_lock_irqsave(&ide_lock, flags);
1428 hwif = hwgroup->hwif;
1429
1430 if (!ide_ack_intr(hwif)) {
1431 spin_unlock_irqrestore(&ide_lock, flags);
1432 return IRQ_NONE;
1433 }
1434
1435 if ((handler = hwgroup->handler) == NULL || hwgroup->polling) {
1436 /*
1437 * Not expecting an interrupt from this drive.
1438 * That means this could be:
1439 * (1) an interrupt from another PCI device
1440 * sharing the same PCI INT# as us.
1441 * or (2) a drive just entered sleep or standby mode,
1442 * and is interrupting to let us know.
1443 * or (3) a spurious interrupt of unknown origin.
1444 *
1445 * For PCI, we cannot tell the difference,
1446 * so in that case we just ignore it and hope it goes away.
1447 *
1448 * FIXME: unexpected_intr should be hwif-> then we can
1449 * remove all the ifdef PCI crap
1450 */
1451#ifdef CONFIG_BLK_DEV_IDEPCI
Bartlomiej Zolnierkiewicz425afb62008-02-01 23:09:31 +01001452 if (hwif->chipset != ide_pci)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453#endif /* CONFIG_BLK_DEV_IDEPCI */
1454 {
1455 /*
1456 * Probably not a shared PCI interrupt,
1457 * so we can safely try to do something about it:
1458 */
1459 unexpected_intr(irq, hwgroup);
1460#ifdef CONFIG_BLK_DEV_IDEPCI
1461 } else {
1462 /*
1463 * Whack the status register, just in case
1464 * we have a leftover pending IRQ.
1465 */
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +02001466 (void) hwif->INB(hwif->io_ports.status_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467#endif /* CONFIG_BLK_DEV_IDEPCI */
1468 }
1469 spin_unlock_irqrestore(&ide_lock, flags);
1470 return IRQ_NONE;
1471 }
1472 drive = hwgroup->drive;
1473 if (!drive) {
1474 /*
1475 * This should NEVER happen, and there isn't much
1476 * we could do about it here.
1477 *
1478 * [Note - this can occur if the drive is hot unplugged]
1479 */
1480 spin_unlock_irqrestore(&ide_lock, flags);
1481 return IRQ_HANDLED;
1482 }
1483 if (!drive_is_ready(drive)) {
1484 /*
1485 * This happens regularly when we share a PCI IRQ with
1486 * another device. Unfortunately, it can also happen
1487 * with some buggy drives that trigger the IRQ before
1488 * their status register is up to date. Hopefully we have
1489 * enough advance overhead that the latter isn't a problem.
1490 */
1491 spin_unlock_irqrestore(&ide_lock, flags);
1492 return IRQ_NONE;
1493 }
1494 if (!hwgroup->busy) {
1495 hwgroup->busy = 1; /* paranoia */
1496 printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
1497 }
1498 hwgroup->handler = NULL;
Suleiman Souhlal23450312007-04-10 22:38:37 +02001499 hwgroup->req_gen++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 del_timer(&hwgroup->timer);
1501 spin_unlock(&ide_lock);
1502
Albert Leef0dd8712007-02-17 02:40:21 +01001503 /* Some controllers might set DMA INTR no matter DMA or PIO;
1504 * bmdma status might need to be cleared even for
1505 * PIO interrupts to prevent spurious/lost irq.
1506 */
1507 if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma))
1508 /* ide_dma_end() needs bmdma status for error checking.
1509 * So, skip clearing bmdma status here and leave it
1510 * to ide_dma_end() if this is dma interrupt.
1511 */
1512 hwif->ide_dma_clear_irq(drive);
1513
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 if (drive->unmask)
Ingo Molnar366c7f52006-07-03 00:25:25 -07001515 local_irq_enable_in_hardirq();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 /* service this interrupt, may set handler for next interrupt */
1517 startstop = handler(drive);
1518 spin_lock_irq(&ide_lock);
1519
1520 /*
1521 * Note that handler() may have set things up for another
1522 * interrupt to occur soon, but it cannot happen until
1523 * we exit from this routine, because it will be the
1524 * same irq as is currently being serviced here, and Linux
1525 * won't allow another of the same (on any CPU) until we return.
1526 */
1527 drive->service_time = jiffies - drive->service_start;
1528 if (startstop == ide_stopped) {
1529 if (hwgroup->handler == NULL) { /* paranoia */
1530 hwgroup->busy = 0;
1531 ide_do_request(hwgroup, hwif->irq);
1532 } else {
1533 printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler "
1534 "on exit\n", drive->name);
1535 }
1536 }
1537 spin_unlock_irqrestore(&ide_lock, flags);
1538 return IRQ_HANDLED;
1539}
1540
1541/**
1542 * ide_init_drive_cmd - initialize a drive command request
1543 * @rq: request object
1544 *
1545 * Initialize a request before we fill it in and send it down to
1546 * ide_do_drive_cmd. Commands must be set up by this function. Right
1547 * now it doesn't do a lot, but if that changes abusers will have a
Andreas Mohrd6e05ed2006-06-26 18:35:02 +02001548 * nasty surprise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 */
1550
1551void ide_init_drive_cmd (struct request *rq)
1552{
FUJITA Tomonorie7b241a2008-04-29 09:54:38 +02001553 blk_rq_init(NULL, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554}
1555
1556EXPORT_SYMBOL(ide_init_drive_cmd);
1557
1558/**
1559 * ide_do_drive_cmd - issue IDE special command
1560 * @drive: device to issue command
1561 * @rq: request to issue
1562 * @action: action for processing
1563 *
1564 * This function issues a special IDE device request
1565 * onto the request queue.
1566 *
1567 * If action is ide_wait, then the rq is queued at the end of the
1568 * request queue, and the function sleeps until it has been processed.
1569 * This is for use when invoked from an ioctl handler.
1570 *
1571 * If action is ide_preempt, then the rq is queued at the head of
1572 * the request queue, displacing the currently-being-processed
1573 * request and this function returns immediately without waiting
1574 * for the new rq to be completed. This is VERY DANGEROUS, and is
1575 * intended for careful use by the ATAPI tape/cdrom driver code.
1576 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 * If action is ide_end, then the rq is queued at the end of the
1578 * request queue, and the function returns immediately without waiting
1579 * for the new rq to be completed. This is again intended for careful
1580 * use by the ATAPI tape/cdrom driver code.
1581 */
1582
1583int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
1584{
1585 unsigned long flags;
1586 ide_hwgroup_t *hwgroup = HWGROUP(drive);
Ingo Molnar60be6b92006-07-03 00:25:26 -07001587 DECLARE_COMPLETION_ONSTACK(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 int where = ELEVATOR_INSERT_BACK, err;
1589 int must_wait = (action == ide_wait || action == ide_head_wait);
1590
1591 rq->errors = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
1593 /*
1594 * we need to hold an extra reference to request for safe inspection
1595 * after completion
1596 */
1597 if (must_wait) {
1598 rq->ref_count++;
Jens Axboec00895a2006-09-30 20:29:12 +02001599 rq->end_io_data = &wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 rq->end_io = blk_end_sync_rq;
1601 }
1602
1603 spin_lock_irqsave(&ide_lock, flags);
1604 if (action == ide_preempt)
1605 hwgroup->rq = NULL;
1606 if (action == ide_preempt || action == ide_head_wait) {
1607 where = ELEVATOR_INSERT_FRONT;
Jens Axboe4aff5e22006-08-10 08:44:47 +02001608 rq->cmd_flags |= REQ_PREEMPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 }
1610 __elv_add_request(drive->queue, rq, where, 0);
1611 ide_do_request(hwgroup, IDE_NO_IRQ);
1612 spin_unlock_irqrestore(&ide_lock, flags);
1613
1614 err = 0;
1615 if (must_wait) {
1616 wait_for_completion(&wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 if (rq->errors)
1618 err = -EIO;
1619
1620 blk_put_request(rq);
1621 }
1622
1623 return err;
1624}
1625
1626EXPORT_SYMBOL(ide_do_drive_cmd);
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +01001627
1628void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma)
1629{
1630 ide_task_t task;
1631
1632 memset(&task, 0, sizeof(task));
1633 task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
1634 IDE_TFLAG_OUT_FEATURE | tf_flags;
1635 task.tf.feature = dma; /* Use PIO/DMA */
1636 task.tf.lbam = bcount & 0xff;
1637 task.tf.lbah = (bcount >> 8) & 0xff;
1638
Bartlomiej Zolnierkiewicz089c5c72008-04-28 23:44:39 +02001639 ide_tf_dump(drive->name, &task.tf);
Bartlomiej Zolnierkiewicz94cd5b62008-04-28 23:44:40 +02001640 drive->hwif->tf_load(drive, &task);
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +01001641}
1642
1643EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load);
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +02001644
1645void ide_pad_transfer(ide_drive_t *drive, int write, int len)
1646{
1647 ide_hwif_t *hwif = drive->hwif;
1648 u8 buf[4] = { 0 };
1649
1650 while (len > 0) {
1651 if (write)
1652 hwif->output_data(drive, NULL, buf, min(4, len));
1653 else
1654 hwif->input_data(drive, NULL, buf, min(4, len));
1655 len -= 4;
1656 }
1657}
1658EXPORT_SYMBOL_GPL(ide_pad_transfer);