blob: cc35d6dbd41026d02cdc1ab5a32085cc8c63e0db [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>
Bartlomiej Zolnierkiewicz3ceca722008-10-10 22:39:27 +020043#include <linux/hdreg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/completion.h>
45#include <linux/reboot.h>
46#include <linux/cdrom.h>
47#include <linux/seq_file.h>
48#include <linux/device.h>
49#include <linux/kmod.h>
50#include <linux/scatterlist.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070051#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53#include <asm/byteorder.h>
54#include <asm/irq.h>
55#include <asm/uaccess.h>
56#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Adrian Bunka7ff7d42006-02-03 03:04:56 -080058static int __ide_end_request(ide_drive_t *drive, struct request *rq,
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +020059 int uptodate, unsigned int nr_bytes, int dequeue)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
61 int ret = 1;
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010062 int error = 0;
63
64 if (uptodate <= 0)
65 error = uptodate ? uptodate : -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 /*
68 * if failfast is set on a request, override number of sectors and
69 * complete the whole request right now
70 */
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010071 if (blk_noretry_request(rq) && error)
Jens Axboe41e9d342007-07-19 08:13:01 +020072 nr_bytes = rq->hard_nr_sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010074 if (!blk_fs_request(rq) && error && !rq->errors)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 rq->errors = -EIO;
76
77 /*
78 * decide whether to reenable DMA -- 3 is a random magic for now,
79 * if we DMA timeout more than 3 times, just stay in PIO
80 */
Bartlomiej Zolnierkiewiczc3922042008-10-13 21:39:37 +020081 if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) &&
82 drive->retry_pio <= 3) {
83 drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY;
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +010084 ide_dma_on(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
86
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +010087 if (!__blk_end_request(rq, error, nr_bytes)) {
88 if (dequeue)
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +020089 HWGROUP(drive)->rq = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 ret = 0;
91 }
Jens Axboe8672d572006-01-09 16:03:35 +010092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return ret;
94}
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/**
97 * ide_end_request - complete an IDE I/O
98 * @drive: IDE device for the I/O
99 * @uptodate:
100 * @nr_sectors: number of sectors completed
101 *
102 * This is our end_request wrapper function. We complete the I/O
103 * update random number input and dequeue the request, which if
104 * it was tagged may be out of order.
105 */
106
107int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
108{
Jens Axboe41e9d342007-07-19 08:13:01 +0200109 unsigned int nr_bytes = nr_sectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 struct request *rq;
111 unsigned long flags;
112 int ret = 1;
113
Jens Axboe8672d572006-01-09 16:03:35 +0100114 /*
115 * room for locking improvements here, the calls below don't
116 * need the queue lock held at all
117 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 spin_lock_irqsave(&ide_lock, flags);
119 rq = HWGROUP(drive)->rq;
120
Jens Axboe41e9d342007-07-19 08:13:01 +0200121 if (!nr_bytes) {
122 if (blk_pc_request(rq))
123 nr_bytes = rq->data_len;
124 else
125 nr_bytes = rq->hard_cur_sectors << 9;
126 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200128 ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 spin_unlock_irqrestore(&ide_lock, flags);
131 return ret;
132}
133EXPORT_SYMBOL(ide_end_request);
134
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100135static void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Jens Axboec00895a2006-09-30 20:29:12 +0200137 struct request_pm_state *pm = rq->data;
Jens Axboead3cadd2006-06-13 08:46:57 +0200138
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100139#ifdef DEBUG_PM
140 printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
141 drive->name, pm->pm_step);
142#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (drive->media != ide_disk)
144 return;
145
Jens Axboead3cadd2006-06-13 08:46:57 +0200146 switch (pm->pm_step) {
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200147 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
Jens Axboead3cadd2006-06-13 08:46:57 +0200148 if (pm->pm_state == PM_EVENT_FREEZE)
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200149 pm->pm_step = IDE_PM_COMPLETED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 else
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200151 pm->pm_step = IDE_PM_STANDBY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 break;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200153 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
154 pm->pm_step = IDE_PM_COMPLETED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 break;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200156 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
157 pm->pm_step = IDE_PM_IDLE;
Jason Lunz8c2c0112006-10-03 01:14:26 -0700158 break;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200159 case IDE_PM_IDLE: /* Resume step 2 (idle)*/
160 pm->pm_step = IDE_PM_RESTORE_DMA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 break;
162 }
163}
164
165static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
166{
Jens Axboec00895a2006-09-30 20:29:12 +0200167 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 ide_task_t *args = rq->special;
169
170 memset(args, 0, sizeof(*args));
171
Jens Axboead3cadd2006-06-13 08:46:57 +0200172 switch (pm->pm_step) {
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200173 case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (drive->media != ide_disk)
175 break;
176 /* Not supported? Switch to next step now. */
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200177 if (ata_id_flush_enabled(drive->id) == 0 ||
178 (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100179 ide_complete_power_step(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return ide_stopped;
181 }
Bartlomiej Zolnierkiewiczff2779b2008-10-10 22:39:31 +0200182 if (ata_id_flush_ext_enabled(drive->id))
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200183 args->tf.command = ATA_CMD_FLUSH_EXT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 else
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200185 args->tf.command = ATA_CMD_FLUSH;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100186 goto out_do_tf;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200187 case IDE_PM_STANDBY: /* Suspend step 2 (standby) */
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200188 args->tf.command = ATA_CMD_STANDBYNOW1;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100189 goto out_do_tf;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200190 case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200191 ide_set_max_pio(drive);
Bartlomiej Zolnierkiewicz317a46a2007-05-10 00:01:11 +0200192 /*
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200193 * skip IDE_PM_IDLE for ATAPI devices
Bartlomiej Zolnierkiewicz317a46a2007-05-10 00:01:11 +0200194 */
195 if (drive->media != ide_disk)
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200196 pm->pm_step = IDE_PM_RESTORE_DMA;
Bartlomiej Zolnierkiewicz317a46a2007-05-10 00:01:11 +0200197 else
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100198 ide_complete_power_step(drive, rq);
Jason Lunz8c2c0112006-10-03 01:14:26 -0700199 return ide_stopped;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200200 case IDE_PM_IDLE: /* Resume step 2 (idle) */
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200201 args->tf.command = ATA_CMD_IDLEIMMEDIATE;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100202 goto out_do_tf;
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200203 case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /*
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200205 * Right now, all we do is call ide_set_dma(drive),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 * we could be smarter and check for current xfer_speed
207 * in struct drive etc...
208 */
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +0200209 if (drive->hwif->dma_ops == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 break;
Bartlomiej Zolnierkiewicz1a659882008-12-08 17:42:35 +0100211 /*
212 * TODO: respect IDE_DFLAG_USING_DMA
213 */
214 ide_set_dma(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 break;
216 }
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200217
218 pm->pm_step = IDE_PM_COMPLETED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return ide_stopped;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100220
221out_do_tf:
Bartlomiej Zolnierkiewicz657cc1a2008-01-26 20:13:10 +0100222 args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
Bartlomiej Zolnierkiewiczac026ff2008-01-25 22:17:14 +0100223 args->data_phase = TASKFILE_NO_DATA;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100224 return do_rw_taskfile(drive, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
227/**
Alan Coxdbe217a2006-06-25 05:47:44 -0700228 * ide_end_dequeued_request - complete an IDE I/O
229 * @drive: IDE device for the I/O
230 * @uptodate:
231 * @nr_sectors: number of sectors completed
232 *
233 * Complete an I/O that is no longer on the request queue. This
234 * typically occurs when we pull the request and issue a REQUEST_SENSE.
235 * We must still finish the old request but we must not tamper with the
236 * queue in the meantime.
237 *
238 * NOTE: This path does not handle barrier, but barrier is not supported
239 * on ide-cd anyway.
240 */
241
242int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
243 int uptodate, int nr_sectors)
244{
245 unsigned long flags;
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200246 int ret;
Alan Coxdbe217a2006-06-25 05:47:44 -0700247
248 spin_lock_irqsave(&ide_lock, flags);
Jens Axboe4aff5e22006-08-10 08:44:47 +0200249 BUG_ON(!blk_rq_started(rq));
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200250 ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0);
Alan Coxdbe217a2006-06-25 05:47:44 -0700251 spin_unlock_irqrestore(&ide_lock, flags);
Bartlomiej Zolnierkiewiczbbc615b2007-10-20 00:32:36 +0200252
Alan Coxdbe217a2006-06-25 05:47:44 -0700253 return ret;
254}
255EXPORT_SYMBOL_GPL(ide_end_dequeued_request);
256
257
258/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 * ide_complete_pm_request - end the current Power Management request
260 * @drive: target drive
261 * @rq: request
262 *
263 * This function cleans up the current PM request and stops the queue
264 * if necessary.
265 */
266static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq)
267{
268 unsigned long flags;
269
270#ifdef DEBUG_PM
271 printk("%s: completing PM request, %s\n", drive->name,
272 blk_pm_suspend_request(rq) ? "suspend" : "resume");
273#endif
274 spin_lock_irqsave(&ide_lock, flags);
275 if (blk_pm_suspend_request(rq)) {
276 blk_stop_queue(drive->queue);
277 } else {
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200278 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 blk_start_queue(drive->queue);
280 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 HWGROUP(drive)->rq = NULL;
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +0100282 if (__blk_end_request(rq, 0, 0))
283 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 spin_unlock_irqrestore(&ide_lock, flags);
285}
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287/**
288 * ide_end_drive_cmd - end an explicit drive command
289 * @drive: command
290 * @stat: status bits
291 * @err: error bits
292 *
293 * Clean up after success/failure of an explicit drive command.
294 * These get thrown onto the queue so they are synchronized with
295 * real I/O operations on the drive.
296 *
297 * In LBA48 mode we have to read the register set twice to get
298 * all the extra information out.
299 */
300
301void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
302{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 unsigned long flags;
304 struct request *rq;
305
306 spin_lock_irqsave(&ide_lock, flags);
307 rq = HWGROUP(drive)->rq;
308 spin_unlock_irqrestore(&ide_lock, flags);
309
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100310 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
Bartlomiej Zolnierkiewicz395d8ef2008-02-11 00:32:14 +0100311 ide_task_t *task = (ide_task_t *)rq->special;
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 if (rq->errors == 0)
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200314 rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT);
Bartlomiej Zolnierkiewicz395d8ef2008-02-11 00:32:14 +0100315
316 if (task) {
317 struct ide_taskfile *tf = &task->tf;
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100318
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100319 tf->error = err;
Bartlomiej Zolnierkiewicz650d8412008-01-25 22:17:06 +0100320 tf->status = stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200322 drive->hwif->tp_ops->tf_read(drive, task);
Bartlomiej Zolnierkiewicz395d8ef2008-02-11 00:32:14 +0100323
324 if (task->tf_flags & IDE_TFLAG_DYN)
325 kfree(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327 } else if (blk_pm_request(rq)) {
Jens Axboec00895a2006-09-30 20:29:12 +0200328 struct request_pm_state *pm = rq->data;
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100329
330 ide_complete_power_step(drive, rq);
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200331 if (pm->pm_step == IDE_PM_COMPLETED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 ide_complete_pm_request(drive, rq);
333 return;
334 }
335
336 spin_lock_irqsave(&ide_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 HWGROUP(drive)->rq = NULL;
338 rq->errors = err;
Kiyoshi Ueda3b0e0442008-02-11 00:32:11 +0100339 if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0),
340 blk_rq_bytes(rq))))
Kiyoshi Ueda5e36bb62008-01-28 10:34:20 +0100341 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 spin_unlock_irqrestore(&ide_lock, flags);
343}
344
345EXPORT_SYMBOL(ide_end_drive_cmd);
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347static void ide_kill_rq(ide_drive_t *drive, struct request *rq)
348{
349 if (rq->rq_disk) {
350 ide_driver_t *drv;
351
352 drv = *(ide_driver_t **)rq->rq_disk->private_data;
353 drv->end_request(drive, 0, 0);
354 } else
355 ide_end_request(drive, 0, 0);
356}
357
358static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
359{
360 ide_hwif_t *hwif = drive->hwif;
361
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200362 if ((stat & ATA_BUSY) ||
363 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 /* other bits are useless when BUSY */
365 rq->errors |= ERROR_RESET;
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200366 } else if (stat & ATA_ERR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 /* err has different meaning on cdrom and tape */
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200368 if (err == ATA_ABORTED) {
Bartlomiej Zolnierkiewiczd1d76712008-10-13 21:39:38 +0200369 if ((drive->dev_flags & IDE_DFLAG_LBA) &&
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200370 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
371 hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 return ide_stopped;
373 } else if ((err & BAD_CRC) == BAD_CRC) {
374 /* UDMA crc error, just retry the operation */
375 drive->crc_count++;
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200376 } else if (err & (ATA_BBK | ATA_UNC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /* retries won't help these */
378 rq->errors = ERROR_MAX;
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200379 } else if (err & ATA_TRK0NF) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 /* help it find track zero */
381 rq->errors |= ERROR_RECAL;
382 }
383 }
384
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200385 if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
Bartlomiej Zolnierkiewicz57279a72008-07-15 21:21:47 +0200386 (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
387 int nsect = drive->mult_count ? drive->mult_count : 1;
388
389 ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200392 if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 ide_kill_rq(drive, rq);
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200394 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200396
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200397 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200398 rq->errors |= ERROR_RESET;
399
400 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
401 ++rq->errors;
402 return ide_do_reset(drive);
403 }
404
405 if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
406 drive->special.b.recalibrate = 1;
407
408 ++rq->errors;
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 return ide_stopped;
411}
412
413static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
414{
415 ide_hwif_t *hwif = drive->hwif;
416
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200417 if ((stat & ATA_BUSY) ||
418 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 /* other bits are useless when BUSY */
420 rq->errors |= ERROR_RESET;
421 } else {
422 /* add decoding error stuff */
423 }
424
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200425 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 /* force an abort */
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200427 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429 if (rq->errors >= ERROR_MAX) {
430 ide_kill_rq(drive, rq);
431 } else {
432 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
433 ++rq->errors;
434 return ide_do_reset(drive);
435 }
436 ++rq->errors;
437 }
438
439 return ide_stopped;
440}
441
442ide_startstop_t
443__ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
444{
445 if (drive->media == ide_disk)
446 return ide_ata_error(drive, rq, stat, err);
447 return ide_atapi_error(drive, rq, stat, err);
448}
449
450EXPORT_SYMBOL_GPL(__ide_error);
451
452/**
453 * ide_error - handle an error on the IDE
454 * @drive: drive the error occurred on
455 * @msg: message to report
456 * @stat: status bits
457 *
458 * ide_error() takes action based on the error returned by the drive.
459 * For normal I/O that may well include retries. We deal with
460 * both new-style (taskfile) and old style command handling here.
461 * In the case of taskfile command handling there is work left to
462 * do
463 */
464
465ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
466{
467 struct request *rq;
468 u8 err;
469
470 err = ide_dump_status(drive, msg, stat);
471
472 if ((rq = HWGROUP(drive)->rq) == NULL)
473 return ide_stopped;
474
475 /* retry only "normal" I/O: */
Jens Axboe4aff5e22006-08-10 08:44:47 +0200476 if (!blk_fs_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 rq->errors = 1;
478 ide_end_drive_cmd(drive, stat, err);
479 return ide_stopped;
480 }
481
482 if (rq->rq_disk) {
483 ide_driver_t *drv;
484
485 drv = *(ide_driver_t **)rq->rq_disk->private_data;
486 return drv->error(drive, rq, stat, err);
487 } else
488 return __ide_error(drive, rq, stat, err);
489}
490
491EXPORT_SYMBOL_GPL(ide_error);
492
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100493static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100495 tf->nsect = drive->sect;
496 tf->lbal = drive->sect;
497 tf->lbam = drive->cyl;
498 tf->lbah = drive->cyl >> 8;
Bartlomiej Zolnierkiewicz7f612f22008-10-13 21:39:40 +0200499 tf->device = (drive->head - 1) | drive->select;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200500 tf->command = ATA_CMD_INIT_DEV_PARAMS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100503static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100505 tf->nsect = drive->sect;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200506 tf->command = ATA_CMD_RESTORE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100509static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100511 tf->nsect = drive->mult_req;
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200512 tf->command = ATA_CMD_SET_MULTI;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
515static ide_startstop_t ide_disk_special(ide_drive_t *drive)
516{
517 special_t *s = &drive->special;
518 ide_task_t args;
519
520 memset(&args, 0, sizeof(ide_task_t));
Bartlomiej Zolnierkiewiczac026ff2008-01-25 22:17:14 +0100521 args.data_phase = TASKFILE_NO_DATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 if (s->b.set_geometry) {
524 s->b.set_geometry = 0;
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100525 ide_tf_set_specify_cmd(drive, &args.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 } else if (s->b.recalibrate) {
527 s->b.recalibrate = 0;
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100528 ide_tf_set_restore_cmd(drive, &args.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 } else if (s->b.set_multmode) {
530 s->b.set_multmode = 0;
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100531 ide_tf_set_setmult_cmd(drive, &args.tf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 } else if (s->all) {
533 int special = s->all;
534 s->all = 0;
535 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
536 return ide_stopped;
537 }
538
Bartlomiej Zolnierkiewicz657cc1a2008-01-26 20:13:10 +0100539 args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE |
Bartlomiej Zolnierkiewicz57d73662008-01-25 22:17:16 +0100540 IDE_TFLAG_CUSTOM_HANDLER;
Bartlomiej Zolnierkiewicz74095a92008-01-25 22:17:07 +0100541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 do_rw_taskfile(drive, &args);
543
544 return ide_started;
545}
546
547/**
548 * do_special - issue some special commands
549 * @drive: drive the command is for
550 *
Bartlomiej Zolnierkiewiczaaaade32008-10-10 22:39:21 +0200551 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
552 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
553 *
554 * It used to do much more, but has been scaled back.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 */
556
557static ide_startstop_t do_special (ide_drive_t *drive)
558{
559 special_t *s = &drive->special;
560
561#ifdef DEBUG
562 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
563#endif
Bartlomiej Zolnierkiewicz6982daf2008-10-13 21:39:40 +0200564 if (drive->media == ide_disk)
565 return ide_disk_special(drive);
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200566
Bartlomiej Zolnierkiewicz6982daf2008-10-13 21:39:40 +0200567 s->all = 0;
568 drive->mult_req = 0;
569 return ide_stopped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570}
571
572void ide_map_sg(ide_drive_t *drive, struct request *rq)
573{
574 ide_hwif_t *hwif = drive->hwif;
575 struct scatterlist *sg = hwif->sg_table;
576
577 if (hwif->sg_mapped) /* needed by ide-scsi */
578 return;
579
Jens Axboe4aff5e22006-08-10 08:44:47 +0200580 if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
582 } else {
583 sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
584 hwif->sg_nents = 1;
585 }
586}
587
588EXPORT_SYMBOL_GPL(ide_map_sg);
589
590void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq)
591{
592 ide_hwif_t *hwif = drive->hwif;
593
594 hwif->nsect = hwif->nleft = rq->nr_sectors;
Jens Axboe55c16a72007-07-25 08:13:56 +0200595 hwif->cursg_ofs = 0;
596 hwif->cursg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
599EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
600
601/**
602 * execute_drive_command - issue special drive command
Adrian Bunk338cec32005-09-10 00:26:54 -0700603 * @drive: the drive to issue the command on
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 * @rq: the request structure holding the command
605 *
606 * execute_drive_cmd() issues a special drive command, usually
607 * initiated by ioctl() from the external hdparm program. The
608 * command can be a drive command, drive task or taskfile
609 * operation. Weirdly you can call it with NULL to wait for
610 * all commands to finish. Don't do this as that is due to change
611 */
612
613static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
614 struct request *rq)
615{
616 ide_hwif_t *hwif = HWIF(drive);
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100617 ide_task_t *task = rq->special;
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100618
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100619 if (task) {
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100620 hwif->data_phase = task->data_phase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 switch (hwif->data_phase) {
623 case TASKFILE_MULTI_OUT:
624 case TASKFILE_OUT:
625 case TASKFILE_MULTI_IN:
626 case TASKFILE_IN:
627 ide_init_sg_cmd(drive, rq);
628 ide_map_sg(drive, rq);
629 default:
630 break;
631 }
632
Bartlomiej Zolnierkiewicz21d535c2008-01-25 22:17:09 +0100633 return do_rw_taskfile(drive, task);
634 }
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 /*
637 * NULL is actually a valid way of waiting for
638 * all current requests to be flushed from the queue.
639 */
640#ifdef DEBUG
641 printk("%s: DRIVE_CMD (null)\n", drive->name);
642#endif
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200643 ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif),
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +0200644 ide_read_error(drive));
Bartlomiej Zolnierkiewicz64a57fe2008-02-06 02:57:51 +0100645
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 return ide_stopped;
647}
648
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200649int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
650 int arg)
651{
652 struct request_queue *q = drive->queue;
653 struct request *rq;
654 int ret = 0;
655
656 if (!(setting->flags & DS_SYNC))
657 return setting->set(drive, arg);
658
Elias Oltmannse415e492008-10-13 21:39:45 +0200659 rq = blk_get_request(q, READ, __GFP_WAIT);
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200660 rq->cmd_type = REQ_TYPE_SPECIAL;
661 rq->cmd_len = 5;
662 rq->cmd[0] = REQ_DEVSET_EXEC;
663 *(int *)&rq->cmd[1] = arg;
664 rq->special = setting->set;
665
666 if (blk_execute_rq(q, NULL, rq, 0))
667 ret = rq->errors;
668 blk_put_request(rq);
669
670 return ret;
671}
672EXPORT_SYMBOL_GPL(ide_devset_execute);
673
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200674static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
675{
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +0200676 u8 cmd = rq->cmd[0];
677
678 if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) {
679 ide_task_t task;
680 struct ide_taskfile *tf = &task.tf;
681
682 memset(&task, 0, sizeof(task));
683 if (cmd == REQ_PARK_HEADS) {
684 drive->sleep = *(unsigned long *)rq->special;
685 drive->dev_flags |= IDE_DFLAG_SLEEPING;
686 tf->command = ATA_CMD_IDLEIMMEDIATE;
687 tf->feature = 0x44;
688 tf->lbal = 0x4c;
689 tf->lbam = 0x4e;
690 tf->lbah = 0x55;
691 task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
692 } else /* cmd == REQ_UNPARK_HEADS */
693 tf->command = ATA_CMD_CHK_POWER;
694
695 task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
696 task.rq = rq;
697 drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA;
698 return do_rw_taskfile(drive, &task);
699 }
700
701 switch (cmd) {
Elias Oltmanns92f1f8f2008-10-10 22:39:40 +0200702 case REQ_DEVSET_EXEC:
703 {
704 int err, (*setfunc)(ide_drive_t *, int) = rq->special;
705
706 err = setfunc(drive, *(int *)&rq->cmd[1]);
707 if (err)
708 rq->errors = err;
709 else
710 err = 1;
711 ide_end_request(drive, err, 0);
712 return ide_stopped;
713 }
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200714 case REQ_DRIVE_RESET:
715 return ide_do_reset(drive);
716 default:
717 blk_dump_rq_flags(rq, "ide_special_rq - bad request");
718 ide_end_request(drive, 0, 0);
719 return ide_stopped;
720 }
721}
722
Jens Axboead3cadd2006-06-13 08:46:57 +0200723static void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
724{
Jens Axboec00895a2006-09-30 20:29:12 +0200725 struct request_pm_state *pm = rq->data;
Jens Axboead3cadd2006-06-13 08:46:57 +0200726
727 if (blk_pm_suspend_request(rq) &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200728 pm->pm_step == IDE_PM_START_SUSPEND)
Jens Axboead3cadd2006-06-13 08:46:57 +0200729 /* Mark drive blocked when starting the suspend sequence. */
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200730 drive->dev_flags |= IDE_DFLAG_BLOCKED;
Jens Axboead3cadd2006-06-13 08:46:57 +0200731 else if (blk_pm_resume_request(rq) &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200732 pm->pm_step == IDE_PM_START_RESUME) {
Jens Axboead3cadd2006-06-13 08:46:57 +0200733 /*
734 * The first thing we do on wakeup is to wait for BSY bit to
735 * go away (with a looong timeout) as a drive on this hwif may
736 * just be POSTing itself.
737 * We do that before even selecting as the "other" device on
738 * the bus may be broken enough to walk on our toes at this
739 * point.
740 */
Bartlomiej Zolnierkiewicz6e6afb32008-07-23 19:55:52 +0200741 ide_hwif_t *hwif = drive->hwif;
Jens Axboead3cadd2006-06-13 08:46:57 +0200742 int rc;
743#ifdef DEBUG_PM
744 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
745#endif
Bartlomiej Zolnierkiewicz6e6afb32008-07-23 19:55:52 +0200746 rc = ide_wait_not_busy(hwif, 35000);
Jens Axboead3cadd2006-06-13 08:46:57 +0200747 if (rc)
748 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
749 SELECT_DRIVE(drive);
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200750 hwif->tp_ops->set_irq(hwif, 1);
Bartlomiej Zolnierkiewicz6e6afb32008-07-23 19:55:52 +0200751 rc = ide_wait_not_busy(hwif, 100000);
Jens Axboead3cadd2006-06-13 08:46:57 +0200752 if (rc)
753 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
754 }
755}
756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757/**
758 * start_request - start of I/O and command issuing for IDE
759 *
760 * start_request() initiates handling of a new I/O request. It
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200761 * accepts commands and I/O (read/write) requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 *
763 * FIXME: this function needs a rename
764 */
765
766static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
767{
768 ide_startstop_t startstop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Jens Axboe4aff5e22006-08-10 08:44:47 +0200770 BUG_ON(!blk_rq_started(rq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772#ifdef DEBUG
773 printk("%s: start_request: current=0x%08lx\n",
774 HWIF(drive)->name, (unsigned long) rq);
775#endif
776
777 /* bail early if we've exceeded max_failures */
778 if (drive->max_failures && (drive->failures > drive->max_failures)) {
Aristeu Rozanskib5e1a4e2008-01-25 22:17:04 +0100779 rq->cmd_flags |= REQ_FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 goto kill_rq;
781 }
782
Jens Axboead3cadd2006-06-13 08:46:57 +0200783 if (blk_pm_request(rq))
784 ide_check_pm_state(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785
786 SELECT_DRIVE(drive);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200787 if (ide_wait_stat(&startstop, drive, drive->ready_stat,
788 ATA_BUSY | ATA_DRQ, WAIT_READY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
790 return startstop;
791 }
792 if (!drive->special.all) {
793 ide_driver_t *drv;
794
Suleiman Souhlal513daad2007-03-26 23:03:20 +0200795 /*
796 * We reset the drive so we need to issue a SETFEATURES.
797 * Do it _after_ do_special() restored device parameters.
798 */
799 if (drive->current_speed == 0xff)
800 ide_config_drive_speed(drive, drive->desired_speed);
801
Bartlomiej Zolnierkiewicz7267c332008-01-26 20:13:13 +0100802 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 return execute_drive_cmd(drive, rq);
804 else if (blk_pm_request(rq)) {
Jens Axboec00895a2006-09-30 20:29:12 +0200805 struct request_pm_state *pm = rq->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806#ifdef DEBUG_PM
807 printk("%s: start_power_step(step: %d)\n",
Bartlomiej Zolnierkiewicz6b7d8fc2008-12-02 20:40:03 +0100808 drive->name, pm->pm_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809#endif
810 startstop = ide_start_power_step(drive, rq);
811 if (startstop == ide_stopped &&
Bartlomiej Zolnierkiewicz0d346ba2008-10-13 21:39:38 +0200812 pm->pm_step == IDE_PM_COMPLETED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 ide_complete_pm_request(drive, rq);
814 return startstop;
Elias Oltmanns79e36a92008-07-16 20:33:48 +0200815 } else if (!rq->rq_disk && blk_special_request(rq))
816 /*
817 * TODO: Once all ULDs have been modified to
818 * check for specific op codes rather than
819 * blindly accepting any special request, the
820 * check for ->rq_disk above may be replaced
821 * by a more suitable mechanism or even
822 * dropped entirely.
823 */
824 return ide_special_rq(drive, rq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 drv = *(ide_driver_t **)rq->rq_disk->private_data;
Bartlomiej Zolnierkiewicz3c619ff2008-10-10 22:39:22 +0200827
828 return drv->do_request(drive, rq, rq->sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 }
830 return do_special(drive);
831kill_rq:
832 ide_kill_rq(drive, rq);
833 return ide_stopped;
834}
835
836/**
837 * ide_stall_queue - pause an IDE device
838 * @drive: drive to stall
839 * @timeout: time to stall for (jiffies)
840 *
841 * ide_stall_queue() can be used by a drive to give excess bandwidth back
842 * to the hwgroup by sleeping for timeout jiffies.
843 */
844
845void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
846{
847 if (timeout > WAIT_WORSTCASE)
848 timeout = WAIT_WORSTCASE;
849 drive->sleep = timeout + jiffies;
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200850 drive->dev_flags |= IDE_DFLAG_SLEEPING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
852
853EXPORT_SYMBOL(ide_stall_queue);
854
855#define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
856
857/**
858 * choose_drive - select a drive to service
859 * @hwgroup: hardware group to select on
860 *
861 * choose_drive() selects the next drive which will be serviced.
862 * This is necessary because the IDE layer can't issue commands
863 * to both drives on the same cable, unlike SCSI.
864 */
865
866static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
867{
868 ide_drive_t *drive, *best;
869
870repeat:
871 best = NULL;
872 drive = hwgroup->drive;
873
874 /*
875 * drive is doing pre-flush, ordered write, post-flush sequence. even
876 * though that is 3 requests, it must be seen as a single transaction.
877 * we must not preempt this drive until that is complete
878 */
879 if (blk_queue_flushing(drive->queue)) {
880 /*
881 * small race where queue could get replugged during
882 * the 3-request flush cycle, just yank the plug since
883 * we want it to finish asap
884 */
885 blk_remove_plug(drive->queue);
886 return drive;
887 }
888
889 do {
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200890 u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING);
891 u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING));
892
893 if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) &&
894 !elv_queue_empty(drive->queue)) {
895 if (best == NULL ||
896 (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) ||
897 (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (!blk_queue_plugged(drive->queue))
899 best = drive;
900 }
901 }
902 } while ((drive = drive->next) != hwgroup->drive);
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200903
904 if (best && (best->dev_flags & IDE_DFLAG_NICE1) &&
905 (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 &&
906 best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 long t = (signed long)(WAKEUP(best) - jiffies);
908 if (t >= WAIT_MIN_SLEEP) {
909 /*
910 * We *may* have some time to spare, but first let's see if
911 * someone can potentially benefit from our nice mood today..
912 */
913 drive = best->next;
914 do {
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200915 if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 && time_before(jiffies - best->service_time, WAKEUP(drive))
917 && time_before(WAKEUP(drive), jiffies + t))
918 {
919 ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP));
920 goto repeat;
921 }
922 } while ((drive = drive->next) != best);
923 }
924 }
925 return best;
926}
927
928/*
929 * Issue a new request to a drive from hwgroup
930 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
931 *
932 * A hwgroup is a serialized group of IDE interfaces. Usually there is
933 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
934 * may have both interfaces in a single hwgroup to "serialize" access.
935 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
936 * together into one hwgroup for serialized access.
937 *
938 * Note also that several hwgroups can end up sharing a single IRQ,
939 * possibly along with many other devices. This is especially common in
940 * PCI-based systems with off-board IDE controller cards.
941 *
942 * The IDE driver uses the single global ide_lock spinlock to protect
943 * access to the request queues, and to protect the hwgroup->busy flag.
944 *
945 * The first thread into the driver for a particular hwgroup sets the
946 * hwgroup->busy flag to indicate that this hwgroup is now active,
947 * and then initiates processing of the top request from the request queue.
948 *
949 * Other threads attempting entry notice the busy setting, and will simply
950 * queue their new requests and exit immediately. Note that hwgroup->busy
951 * remains set even when the driver is merely awaiting the next interrupt.
952 * Thus, the meaning is "this hwgroup is busy processing a request".
953 *
954 * When processing of a request completes, the completing thread or IRQ-handler
955 * will start the next request from the queue. If no more work remains,
956 * the driver will clear the hwgroup->busy flag and exit.
957 *
958 * The ide_lock (spinlock) is used to protect all access to the
959 * hwgroup->busy flag, but is otherwise not needed for most processing in
960 * the driver. This makes the driver much more friendlier to shared IRQs
961 * than previous designs, while remaining 100% (?) SMP safe and capable.
962 */
963static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
964{
965 ide_drive_t *drive;
966 ide_hwif_t *hwif;
967 struct request *rq;
968 ide_startstop_t startstop;
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +1000969 int loops = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 /* caller must own ide_lock */
972 BUG_ON(!irqs_disabled());
973
974 while (!hwgroup->busy) {
975 hwgroup->busy = 1;
Michael Schmitzf9e33262008-12-02 20:40:02 +0100976 /* for atari only */
977 ide_get_lock(ide_intr, hwgroup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 drive = choose_drive(hwgroup);
979 if (drive == NULL) {
980 int sleeping = 0;
981 unsigned long sleep = 0; /* shut up, gcc */
982 hwgroup->rq = NULL;
983 drive = hwgroup->drive;
984 do {
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200985 if ((drive->dev_flags & IDE_DFLAG_SLEEPING) &&
986 (sleeping == 0 ||
987 time_before(drive->sleep, sleep))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 sleeping = 1;
989 sleep = drive->sleep;
990 }
991 } while ((drive = drive->next) != hwgroup->drive);
992 if (sleeping) {
993 /*
994 * Take a short snooze, and then wake up this hwgroup again.
995 * This gives other hwgroups on the same a chance to
996 * play fairly with us, just in case there are big differences
997 * in relative throughputs.. don't want to hog the cpu too much.
998 */
999 if (time_before(sleep, jiffies + WAIT_MIN_SLEEP))
1000 sleep = jiffies + WAIT_MIN_SLEEP;
1001#if 1
1002 if (timer_pending(&hwgroup->timer))
1003 printk(KERN_CRIT "ide_set_handler: timer already active\n");
1004#endif
1005 /* so that ide_timer_expiry knows what to do */
1006 hwgroup->sleeping = 1;
Suleiman Souhlal23450312007-04-10 22:38:37 +02001007 hwgroup->req_gen_timer = hwgroup->req_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 mod_timer(&hwgroup->timer, sleep);
1009 /* we purposely leave hwgroup->busy==1
1010 * while sleeping */
1011 } else {
1012 /* Ugly, but how can we sleep for the lock
1013 * otherwise? perhaps from tq_disk?
1014 */
1015
1016 /* for atari only */
1017 ide_release_lock();
1018 hwgroup->busy = 0;
1019 }
1020
1021 /* no more work for this hwgroup (for now) */
1022 return;
1023 }
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001024 again:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 hwif = HWIF(drive);
Bartlomiej Zolnierkiewicz81ca6912008-01-26 20:13:08 +01001026 if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) {
Bartlomiej Zolnierkiewicz7299a392008-01-25 22:17:14 +01001027 /*
1028 * set nIEN for previous hwif, drives in the
1029 * quirk_list may not like intr setups/cleanups
1030 */
1031 if (drive->quirk_list != 1)
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001032 hwif->tp_ops->set_irq(hwif, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 }
1034 hwgroup->hwif = hwif;
1035 hwgroup->drive = drive;
Elias Oltmanns4abdc6e2008-10-13 21:39:50 +02001036 drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 drive->service_start = jiffies;
1038
1039 if (blk_queue_plugged(drive->queue)) {
1040 printk(KERN_ERR "ide: huh? queue was plugged!\n");
1041 break;
1042 }
1043
1044 /*
1045 * we know that the queue isn't empty, but this can happen
1046 * if the q->prep_rq_fn() decides to kill a request
1047 */
1048 rq = elv_next_request(drive->queue);
1049 if (!rq) {
1050 hwgroup->busy = 0;
1051 break;
1052 }
1053
1054 /*
1055 * Sanity: don't accept a request that isn't a PM request
1056 * if we are currently power managed. This is very important as
1057 * blk_stop_queue() doesn't prevent the elv_next_request()
1058 * above to return us whatever is in the queue. Since we call
1059 * ide_do_request() ourselves, we end up taking requests while
1060 * the queue is blocked...
1061 *
1062 * We let requests forced at head of queue with ide-preempt
1063 * though. I hope that doesn't happen too much, hopefully not
1064 * unless the subdriver triggers such a thing in its own PM
1065 * state machine.
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001066 *
1067 * We count how many times we loop here to make sure we service
1068 * all drives in the hwgroup without looping for ever
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 */
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +02001070 if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
1071 blk_pm_request(rq) == 0 &&
1072 (rq->cmd_flags & REQ_PREEMPT) == 0) {
Benjamin Herrenschmidt867f8b42005-10-09 10:37:47 +10001073 drive = drive->next ? drive->next : hwgroup->drive;
1074 if (loops++ < 4 && !blk_queue_plugged(drive->queue))
1075 goto again;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 /* We clear busy, there should be no pending ATA command at this point. */
1077 hwgroup->busy = 0;
1078 break;
1079 }
1080
1081 hwgroup->rq = rq;
1082
1083 /*
1084 * Some systems have trouble with IDE IRQs arriving while
1085 * the driver is still setting things up. So, here we disable
1086 * the IRQ used by this interface while the request is being started.
1087 * This may look bad at first, but pretty much the same thing
1088 * happens anyway when any interrupt comes in, IDE or otherwise
1089 * -- the kernel masks the IRQ while it is being handled.
1090 */
1091 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
1092 disable_irq_nosync(hwif->irq);
1093 spin_unlock(&ide_lock);
Ingo Molnar366c7f52006-07-03 00:25:25 -07001094 local_irq_enable_in_hardirq();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 /* allow other IRQs while we start this request */
1096 startstop = start_request(drive, rq);
1097 spin_lock_irq(&ide_lock);
1098 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
1099 enable_irq(hwif->irq);
1100 if (startstop == ide_stopped)
1101 hwgroup->busy = 0;
1102 }
1103}
1104
1105/*
1106 * Passes the stuff to ide_do_request
1107 */
Jens Axboe165125e2007-07-24 09:28:11 +02001108void do_ide_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
1110 ide_drive_t *drive = q->queuedata;
1111
1112 ide_do_request(HWGROUP(drive), IDE_NO_IRQ);
1113}
1114
1115/*
1116 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1117 * retry the current request in pio mode instead of risking tossing it
1118 * all away
1119 */
1120static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
1121{
1122 ide_hwif_t *hwif = HWIF(drive);
1123 struct request *rq;
1124 ide_startstop_t ret = ide_stopped;
1125
1126 /*
1127 * end current dma transaction
1128 */
1129
1130 if (error < 0) {
1131 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +02001132 (void)hwif->dma_ops->dma_end(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 ret = ide_error(drive, "dma timeout error",
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001134 hwif->tp_ops->read_status(hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 } else {
1136 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +02001137 hwif->dma_ops->dma_timeout(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 }
1139
1140 /*
1141 * disable dma for now, but remember that we did so because of
1142 * a timeout -- we'll reenable after we finish this next request
1143 * (or rather the first chunk of it) in pio.
1144 */
Bartlomiej Zolnierkiewiczc3922042008-10-13 21:39:37 +02001145 drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 drive->retry_pio++;
Bartlomiej Zolnierkiewicz4a546e02008-01-26 20:13:01 +01001147 ide_dma_off_quietly(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149 /*
1150 * un-busy drive etc (hwgroup->busy is cleared on return) and
1151 * make sure request is sane
1152 */
1153 rq = HWGROUP(drive)->rq;
Hua Zhongce42f192006-10-03 01:14:15 -07001154
1155 if (!rq)
1156 goto out;
1157
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 HWGROUP(drive)->rq = NULL;
1159
1160 rq->errors = 0;
1161
1162 if (!rq->bio)
1163 goto out;
1164
1165 rq->sector = rq->bio->bi_sector;
1166 rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
1167 rq->hard_cur_sectors = rq->current_nr_sectors;
1168 rq->buffer = bio_data(rq->bio);
1169out:
1170 return ret;
1171}
1172
1173/**
1174 * ide_timer_expiry - handle lack of an IDE interrupt
1175 * @data: timer callback magic (hwgroup)
1176 *
1177 * An IDE command has timed out before the expected drive return
1178 * occurred. At this point we attempt to clean up the current
1179 * mess. If the current handler includes an expiry handler then
1180 * we invoke the expiry handler, and providing it is happy the
1181 * work is done. If that fails we apply generic recovery rules
1182 * invoking the handler and checking the drive DMA status. We
1183 * have an excessively incestuous relationship with the DMA
1184 * logic that wants cleaning up.
1185 */
1186
1187void ide_timer_expiry (unsigned long data)
1188{
1189 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1190 ide_handler_t *handler;
1191 ide_expiry_t *expiry;
1192 unsigned long flags;
1193 unsigned long wait = -1;
1194
1195 spin_lock_irqsave(&ide_lock, flags);
1196
Suleiman Souhlal23450312007-04-10 22:38:37 +02001197 if (((handler = hwgroup->handler) == NULL) ||
1198 (hwgroup->req_gen != hwgroup->req_gen_timer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 /*
1200 * Either a marginal timeout occurred
1201 * (got the interrupt just as timer expired),
1202 * or we were "sleeping" to give other devices a chance.
1203 * Either way, we don't really want to complain about anything.
1204 */
1205 if (hwgroup->sleeping) {
1206 hwgroup->sleeping = 0;
1207 hwgroup->busy = 0;
1208 }
1209 } else {
1210 ide_drive_t *drive = hwgroup->drive;
1211 if (!drive) {
1212 printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n");
1213 hwgroup->handler = NULL;
1214 } else {
1215 ide_hwif_t *hwif;
1216 ide_startstop_t startstop = ide_stopped;
1217 if (!hwgroup->busy) {
1218 hwgroup->busy = 1; /* paranoia */
1219 printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
1220 }
1221 if ((expiry = hwgroup->expiry) != NULL) {
1222 /* continue */
1223 if ((wait = expiry(drive)) > 0) {
1224 /* reset timer */
1225 hwgroup->timer.expires = jiffies + wait;
Suleiman Souhlal23450312007-04-10 22:38:37 +02001226 hwgroup->req_gen_timer = hwgroup->req_gen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 add_timer(&hwgroup->timer);
1228 spin_unlock_irqrestore(&ide_lock, flags);
1229 return;
1230 }
1231 }
1232 hwgroup->handler = NULL;
1233 /*
1234 * We need to simulate a real interrupt when invoking
1235 * the handler() function, which means we need to
1236 * globally mask the specific IRQ:
1237 */
1238 spin_unlock(&ide_lock);
1239 hwif = HWIF(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 /* disable_irq_nosync ?? */
1241 disable_irq(hwif->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 /* local CPU only,
1243 * as if we were handling an interrupt */
1244 local_irq_disable();
1245 if (hwgroup->polling) {
1246 startstop = handler(drive);
1247 } else if (drive_is_ready(drive)) {
1248 if (drive->waiting_for_dma)
Bartlomiej Zolnierkiewicz5e37bdc2008-04-26 22:25:24 +02001249 hwif->dma_ops->dma_lost_irq(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 (void)ide_ack_intr(hwif);
1251 printk(KERN_WARNING "%s: lost interrupt\n", drive->name);
1252 startstop = handler(drive);
1253 } else {
1254 if (drive->waiting_for_dma) {
1255 startstop = ide_dma_timeout_retry(drive, wait);
1256 } else
1257 startstop =
Bartlomiej Zolnierkiewiczc47137a2008-02-06 02:57:51 +01001258 ide_error(drive, "irq timeout",
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001259 hwif->tp_ops->read_status(hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 }
1261 drive->service_time = jiffies - drive->service_start;
1262 spin_lock_irq(&ide_lock);
1263 enable_irq(hwif->irq);
1264 if (startstop == ide_stopped)
1265 hwgroup->busy = 0;
1266 }
1267 }
1268 ide_do_request(hwgroup, IDE_NO_IRQ);
1269 spin_unlock_irqrestore(&ide_lock, flags);
1270}
1271
1272/**
1273 * unexpected_intr - handle an unexpected IDE interrupt
1274 * @irq: interrupt line
1275 * @hwgroup: hwgroup being processed
1276 *
1277 * There's nothing really useful we can do with an unexpected interrupt,
1278 * other than reading the status register (to clear it), and logging it.
1279 * There should be no way that an irq can happen before we're ready for it,
1280 * so we needn't worry much about losing an "important" interrupt here.
1281 *
1282 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1283 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1284 * looks "good", we just ignore the interrupt completely.
1285 *
1286 * This routine assumes __cli() is in effect when called.
1287 *
1288 * If an unexpected interrupt happens on irq15 while we are handling irq14
1289 * and if the two interfaces are "serialized" (CMD640), then it looks like
1290 * we could screw up by interfering with a new request being set up for
1291 * irq15.
1292 *
1293 * In reality, this is a non-issue. The new command is not sent unless
1294 * the drive is ready to accept one, in which case we know the drive is
1295 * not trying to interrupt us. And ide_set_handler() is always invoked
1296 * before completing the issuance of any new drive command, so we will not
1297 * be accidentally invoked as a result of any valid command completion
1298 * interrupt.
1299 *
1300 * Note that we must walk the entire hwgroup here. We know which hwif
1301 * is doing the current command, but we don't know which hwif burped
1302 * mysteriously.
1303 */
1304
1305static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1306{
1307 u8 stat;
1308 ide_hwif_t *hwif = hwgroup->hwif;
1309
1310 /*
1311 * handle the unexpected interrupt
1312 */
1313 do {
1314 if (hwif->irq == irq) {
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001315 stat = hwif->tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewiczb73c7ee2008-07-23 19:55:52 +02001316
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +02001317 if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 /* Try to not flood the console with msgs */
1319 static unsigned long last_msgtime, count;
1320 ++count;
1321 if (time_after(jiffies, last_msgtime + HZ)) {
1322 last_msgtime = jiffies;
1323 printk(KERN_ERR "%s%s: unexpected interrupt, "
1324 "status=0x%02x, count=%ld\n",
1325 hwif->name,
1326 (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
1327 }
1328 }
1329 }
1330 } while ((hwif = hwif->next) != hwgroup->hwif);
1331}
1332
1333/**
1334 * ide_intr - default IDE interrupt handler
1335 * @irq: interrupt number
1336 * @dev_id: hwif group
1337 * @regs: unused weirdness from the kernel irq layer
1338 *
1339 * This is the default IRQ handler for the IDE layer. You should
1340 * not need to override it. If you do be aware it is subtle in
1341 * places
1342 *
1343 * hwgroup->hwif is the interface in the group currently performing
1344 * a command. hwgroup->drive is the drive and hwgroup->handler is
1345 * the IRQ handler to call. As we issue a command the handlers
1346 * step through multiple states, reassigning the handler to the
1347 * next step in the process. Unlike a smart SCSI controller IDE
1348 * expects the main processor to sequence the various transfer
1349 * stages. We also manage a poll timer to catch up with most
1350 * timeout situations. There are still a few where the handlers
1351 * don't ever decide to give up.
1352 *
1353 * The handler eventually returns ide_stopped to indicate the
1354 * request completed. At this point we issue the next request
1355 * on the hwgroup and the process begins again.
1356 */
1357
David Howells7d12e782006-10-05 14:55:46 +01001358irqreturn_t ide_intr (int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359{
1360 unsigned long flags;
1361 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
1362 ide_hwif_t *hwif;
1363 ide_drive_t *drive;
1364 ide_handler_t *handler;
1365 ide_startstop_t startstop;
1366
1367 spin_lock_irqsave(&ide_lock, flags);
1368 hwif = hwgroup->hwif;
1369
1370 if (!ide_ack_intr(hwif)) {
1371 spin_unlock_irqrestore(&ide_lock, flags);
1372 return IRQ_NONE;
1373 }
1374
1375 if ((handler = hwgroup->handler) == NULL || hwgroup->polling) {
1376 /*
1377 * Not expecting an interrupt from this drive.
1378 * That means this could be:
1379 * (1) an interrupt from another PCI device
1380 * sharing the same PCI INT# as us.
1381 * or (2) a drive just entered sleep or standby mode,
1382 * and is interrupting to let us know.
1383 * or (3) a spurious interrupt of unknown origin.
1384 *
1385 * For PCI, we cannot tell the difference,
1386 * so in that case we just ignore it and hope it goes away.
1387 *
1388 * FIXME: unexpected_intr should be hwif-> then we can
1389 * remove all the ifdef PCI crap
1390 */
1391#ifdef CONFIG_BLK_DEV_IDEPCI
Bartlomiej Zolnierkiewicz425afb62008-02-01 23:09:31 +01001392 if (hwif->chipset != ide_pci)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393#endif /* CONFIG_BLK_DEV_IDEPCI */
1394 {
1395 /*
1396 * Probably not a shared PCI interrupt,
1397 * so we can safely try to do something about it:
1398 */
1399 unexpected_intr(irq, hwgroup);
1400#ifdef CONFIG_BLK_DEV_IDEPCI
1401 } else {
1402 /*
1403 * Whack the status register, just in case
1404 * we have a leftover pending IRQ.
1405 */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001406 (void)hwif->tp_ops->read_status(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407#endif /* CONFIG_BLK_DEV_IDEPCI */
1408 }
1409 spin_unlock_irqrestore(&ide_lock, flags);
1410 return IRQ_NONE;
1411 }
1412 drive = hwgroup->drive;
1413 if (!drive) {
1414 /*
1415 * This should NEVER happen, and there isn't much
1416 * we could do about it here.
1417 *
1418 * [Note - this can occur if the drive is hot unplugged]
1419 */
1420 spin_unlock_irqrestore(&ide_lock, flags);
1421 return IRQ_HANDLED;
1422 }
1423 if (!drive_is_ready(drive)) {
1424 /*
1425 * This happens regularly when we share a PCI IRQ with
1426 * another device. Unfortunately, it can also happen
1427 * with some buggy drives that trigger the IRQ before
1428 * their status register is up to date. Hopefully we have
1429 * enough advance overhead that the latter isn't a problem.
1430 */
1431 spin_unlock_irqrestore(&ide_lock, flags);
1432 return IRQ_NONE;
1433 }
1434 if (!hwgroup->busy) {
1435 hwgroup->busy = 1; /* paranoia */
1436 printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
1437 }
1438 hwgroup->handler = NULL;
Suleiman Souhlal23450312007-04-10 22:38:37 +02001439 hwgroup->req_gen++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 del_timer(&hwgroup->timer);
1441 spin_unlock(&ide_lock);
1442
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +02001443 if (hwif->port_ops && hwif->port_ops->clear_irq)
1444 hwif->port_ops->clear_irq(drive);
Albert Leef0dd8712007-02-17 02:40:21 +01001445
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +02001446 if (drive->dev_flags & IDE_DFLAG_UNMASK)
Ingo Molnar366c7f52006-07-03 00:25:25 -07001447 local_irq_enable_in_hardirq();
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +02001448
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 /* service this interrupt, may set handler for next interrupt */
1450 startstop = handler(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
Bartlomiej Zolnierkiewiczbfa7d8e2008-10-13 21:39:42 +02001452 spin_lock_irq(&ide_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 /*
1454 * Note that handler() may have set things up for another
1455 * interrupt to occur soon, but it cannot happen until
1456 * we exit from this routine, because it will be the
1457 * same irq as is currently being serviced here, and Linux
1458 * won't allow another of the same (on any CPU) until we return.
1459 */
1460 drive->service_time = jiffies - drive->service_start;
1461 if (startstop == ide_stopped) {
1462 if (hwgroup->handler == NULL) { /* paranoia */
1463 hwgroup->busy = 0;
1464 ide_do_request(hwgroup, hwif->irq);
1465 } else {
1466 printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler "
1467 "on exit\n", drive->name);
1468 }
1469 }
1470 spin_unlock_irqrestore(&ide_lock, flags);
1471 return IRQ_HANDLED;
1472}
1473
1474/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 * ide_do_drive_cmd - issue IDE special command
1476 * @drive: device to issue command
1477 * @rq: request to issue
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 *
1479 * This function issues a special IDE device request
1480 * onto the request queue.
1481 *
FUJITA Tomonori63f5abb2008-07-15 21:21:51 +02001482 * the rq is queued at the head of the request queue, displacing
1483 * the currently-being-processed request and this function
1484 * returns immediately without waiting for the new rq to be
1485 * completed. This is VERY DANGEROUS, and is intended for
1486 * careful use by the ATAPI tape/cdrom driver code.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 */
FUJITA Tomonori63f5abb2008-07-15 21:21:51 +02001488
1489void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490{
1491 unsigned long flags;
1492 ide_hwgroup_t *hwgroup = HWGROUP(drive);
Bartlomiej Zolnierkiewicze8a96aa2008-07-15 21:21:41 +02001493
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 spin_lock_irqsave(&ide_lock, flags);
FUJITA Tomonori63f5abb2008-07-15 21:21:51 +02001495 hwgroup->rq = NULL;
Jens Axboef73e2d12008-10-17 14:03:08 +02001496 __elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
1497 blk_start_queueing(drive->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 spin_unlock_irqrestore(&ide_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499}
1500
1501EXPORT_SYMBOL(ide_do_drive_cmd);
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +01001502
1503void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma)
1504{
Bartlomiej Zolnierkiewicz6e6afb32008-07-23 19:55:52 +02001505 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +01001506 ide_task_t task;
1507
1508 memset(&task, 0, sizeof(task));
1509 task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
1510 IDE_TFLAG_OUT_FEATURE | tf_flags;
1511 task.tf.feature = dma; /* Use PIO/DMA */
1512 task.tf.lbam = bcount & 0xff;
1513 task.tf.lbah = (bcount >> 8) & 0xff;
1514
Bartlomiej Zolnierkiewicz089c5c72008-04-28 23:44:39 +02001515 ide_tf_dump(drive->name, &task.tf);
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001516 hwif->tp_ops->set_irq(hwif, 1);
Bartlomiej Zolnierkiewiczed4af482008-07-15 21:21:48 +02001517 SELECT_MASK(drive, 0);
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001518 hwif->tp_ops->tf_load(drive, &task);
Bartlomiej Zolnierkiewicz2fc57382008-01-25 22:17:13 +01001519}
1520
1521EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load);
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +02001522
1523void ide_pad_transfer(ide_drive_t *drive, int write, int len)
1524{
1525 ide_hwif_t *hwif = drive->hwif;
1526 u8 buf[4] = { 0 };
1527
1528 while (len > 0) {
1529 if (write)
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001530 hwif->tp_ops->output_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +02001531 else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +02001532 hwif->tp_ops->input_data(drive, NULL, buf, min(4, len));
Bartlomiej Zolnierkiewicz9f87abe2008-04-28 23:44:41 +02001533 len -= 4;
1534 }
1535}
1536EXPORT_SYMBOL_GPL(ide_pad_transfer);