Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IDE I/O functions |
| 3 | * |
| 4 | * Basic PIO and command management functionality. |
| 5 | * |
| 6 | * This code was split off from ide.c. See ide.c for history and original |
| 7 | * copyrights. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the |
| 11 | * Free Software Foundation; either version 2, or (at your option) any |
| 12 | * later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * For the avoidance of doubt the "preferred form" of this code is one which |
| 20 | * is in an open non patent encumbered format. Where cryptographic key signing |
| 21 | * forms part of the process of creating an executable the information |
| 22 | * including keys needed to generate an equivalently functional executable |
| 23 | * are deemed to be part of the source code. |
| 24 | */ |
| 25 | |
| 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/module.h> |
| 28 | #include <linux/types.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/timer.h> |
| 32 | #include <linux/mm.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | #include <linux/major.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/genhd.h> |
| 37 | #include <linux/blkpg.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/pci.h> |
| 41 | #include <linux/delay.h> |
| 42 | #include <linux/ide.h> |
Bartlomiej Zolnierkiewicz | 3ceca72 | 2008-10-10 22:39:27 +0200 | [diff] [blame] | 43 | #include <linux/hdreg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #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 Slaby | 1977f03 | 2007-10-18 23:40:25 -0700 | [diff] [blame] | 51 | #include <linux/bitops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | #include <asm/byteorder.h> |
| 54 | #include <asm/irq.h> |
| 55 | #include <asm/uaccess.h> |
| 56 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Adrian Bunk | a7ff7d4 | 2006-02-03 03:04:56 -0800 | [diff] [blame] | 58 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
Bartlomiej Zolnierkiewicz | bbc615b | 2007-10-20 00:32:36 +0200 | [diff] [blame] | 59 | int uptodate, unsigned int nr_bytes, int dequeue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | { |
| 61 | int ret = 1; |
Kiyoshi Ueda | 5e36bb6 | 2008-01-28 10:34:20 +0100 | [diff] [blame] | 62 | int error = 0; |
| 63 | |
| 64 | if (uptodate <= 0) |
| 65 | error = uptodate ? uptodate : -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /* |
| 68 | * if failfast is set on a request, override number of sectors and |
| 69 | * complete the whole request right now |
| 70 | */ |
Kiyoshi Ueda | 5e36bb6 | 2008-01-28 10:34:20 +0100 | [diff] [blame] | 71 | if (blk_noretry_request(rq) && error) |
Jens Axboe | 41e9d34 | 2007-07-19 08:13:01 +0200 | [diff] [blame] | 72 | nr_bytes = rq->hard_nr_sectors << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Kiyoshi Ueda | 5e36bb6 | 2008-01-28 10:34:20 +0100 | [diff] [blame] | 74 | if (!blk_fs_request(rq) && error && !rq->errors) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | 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 Zolnierkiewicz | c392204 | 2008-10-13 21:39:37 +0200 | [diff] [blame] | 81 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
| 82 | drive->retry_pio <= 3) { |
| 83 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; |
Bartlomiej Zolnierkiewicz | 4a546e0 | 2008-01-26 20:13:01 +0100 | [diff] [blame] | 84 | ide_dma_on(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
Bartlomiej Zolnierkiewicz | 3c8a2cc | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 87 | if (!blk_end_request(rq, error, nr_bytes)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | ret = 0; |
Bartlomiej Zolnierkiewicz | a72b214 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 89 | |
| 90 | if (ret == 0 && dequeue) |
| 91 | drive->hwif->hwgroup->rq = NULL; |
Jens Axboe | 8672d57 | 2006-01-09 16:03:35 +0100 | [diff] [blame] | 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | return ret; |
| 94 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 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 | |
| 107 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) |
| 108 | { |
Jens Axboe | 41e9d34 | 2007-07-19 08:13:01 +0200 | [diff] [blame] | 109 | unsigned int nr_bytes = nr_sectors << 9; |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 110 | struct request *rq = drive->hwif->hwgroup->rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Jens Axboe | 41e9d34 | 2007-07-19 08:13:01 +0200 | [diff] [blame] | 112 | if (!nr_bytes) { |
| 113 | if (blk_pc_request(rq)) |
| 114 | nr_bytes = rq->data_len; |
| 115 | else |
| 116 | nr_bytes = rq->hard_cur_sectors << 9; |
| 117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Bartlomiej Zolnierkiewicz | a72b214 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 119 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | EXPORT_SYMBOL(ide_end_request); |
| 122 | |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 123 | static void ide_complete_power_step(ide_drive_t *drive, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 125 | struct request_pm_state *pm = rq->data; |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 126 | |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 127 | #ifdef DEBUG_PM |
| 128 | printk(KERN_INFO "%s: complete_power_step(step: %d)\n", |
| 129 | drive->name, pm->pm_step); |
| 130 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | if (drive->media != ide_disk) |
| 132 | return; |
| 133 | |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 134 | switch (pm->pm_step) { |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 135 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 136 | if (pm->pm_state == PM_EVENT_FREEZE) |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 137 | pm->pm_step = IDE_PM_COMPLETED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | else |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 139 | pm->pm_step = IDE_PM_STANDBY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | break; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 141 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
| 142 | pm->pm_step = IDE_PM_COMPLETED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | break; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 144 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
| 145 | pm->pm_step = IDE_PM_IDLE; |
Jason Lunz | 8c2c011 | 2006-10-03 01:14:26 -0700 | [diff] [blame] | 146 | break; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 147 | case IDE_PM_IDLE: /* Resume step 2 (idle)*/ |
| 148 | pm->pm_step = IDE_PM_RESTORE_DMA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | break; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq) |
| 154 | { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 155 | struct request_pm_state *pm = rq->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | ide_task_t *args = rq->special; |
| 157 | |
| 158 | memset(args, 0, sizeof(*args)); |
| 159 | |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 160 | switch (pm->pm_step) { |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 161 | case IDE_PM_FLUSH_CACHE: /* Suspend step 1 (flush cache) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (drive->media != ide_disk) |
| 163 | break; |
| 164 | /* Not supported? Switch to next step now. */ |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 165 | if (ata_id_flush_enabled(drive->id) == 0 || |
| 166 | (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) { |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 167 | ide_complete_power_step(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return ide_stopped; |
| 169 | } |
Bartlomiej Zolnierkiewicz | ff2779b | 2008-10-10 22:39:31 +0200 | [diff] [blame] | 170 | if (ata_id_flush_ext_enabled(drive->id)) |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 171 | args->tf.command = ATA_CMD_FLUSH_EXT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | else |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 173 | args->tf.command = ATA_CMD_FLUSH; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 174 | goto out_do_tf; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 175 | case IDE_PM_STANDBY: /* Suspend step 2 (standby) */ |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 176 | args->tf.command = ATA_CMD_STANDBYNOW1; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 177 | goto out_do_tf; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 178 | case IDE_PM_RESTORE_PIO: /* Resume step 1 (restore PIO) */ |
Bartlomiej Zolnierkiewicz | 26bcb87 | 2007-10-11 23:54:00 +0200 | [diff] [blame] | 179 | ide_set_max_pio(drive); |
Bartlomiej Zolnierkiewicz | 317a46a | 2007-05-10 00:01:11 +0200 | [diff] [blame] | 180 | /* |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 181 | * skip IDE_PM_IDLE for ATAPI devices |
Bartlomiej Zolnierkiewicz | 317a46a | 2007-05-10 00:01:11 +0200 | [diff] [blame] | 182 | */ |
| 183 | if (drive->media != ide_disk) |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 184 | pm->pm_step = IDE_PM_RESTORE_DMA; |
Bartlomiej Zolnierkiewicz | 317a46a | 2007-05-10 00:01:11 +0200 | [diff] [blame] | 185 | else |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 186 | ide_complete_power_step(drive, rq); |
Jason Lunz | 8c2c011 | 2006-10-03 01:14:26 -0700 | [diff] [blame] | 187 | return ide_stopped; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 188 | case IDE_PM_IDLE: /* Resume step 2 (idle) */ |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 189 | args->tf.command = ATA_CMD_IDLEIMMEDIATE; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 190 | goto out_do_tf; |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 191 | case IDE_PM_RESTORE_DMA: /* Resume step 3 (restore DMA) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | /* |
Bartlomiej Zolnierkiewicz | 0ae2e17 | 2007-10-16 22:29:55 +0200 | [diff] [blame] | 193 | * Right now, all we do is call ide_set_dma(drive), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | * we could be smarter and check for current xfer_speed |
| 195 | * in struct drive etc... |
| 196 | */ |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 197 | if (drive->hwif->dma_ops == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | break; |
Bartlomiej Zolnierkiewicz | 1a65988 | 2008-12-08 17:42:35 +0100 | [diff] [blame] | 199 | /* |
| 200 | * TODO: respect IDE_DFLAG_USING_DMA |
| 201 | */ |
| 202 | ide_set_dma(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | break; |
| 204 | } |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 205 | |
| 206 | pm->pm_step = IDE_PM_COMPLETED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | return ide_stopped; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 208 | |
| 209 | out_do_tf: |
Bartlomiej Zolnierkiewicz | 657cc1a | 2008-01-26 20:13:10 +0100 | [diff] [blame] | 210 | args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
Bartlomiej Zolnierkiewicz | ac026ff | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 211 | args->data_phase = TASKFILE_NO_DATA; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 212 | return do_rw_taskfile(drive, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | /** |
Alan Cox | dbe217a | 2006-06-25 05:47:44 -0700 | [diff] [blame] | 216 | * ide_end_dequeued_request - complete an IDE I/O |
| 217 | * @drive: IDE device for the I/O |
| 218 | * @uptodate: |
| 219 | * @nr_sectors: number of sectors completed |
| 220 | * |
| 221 | * Complete an I/O that is no longer on the request queue. This |
| 222 | * typically occurs when we pull the request and issue a REQUEST_SENSE. |
| 223 | * We must still finish the old request but we must not tamper with the |
| 224 | * queue in the meantime. |
| 225 | * |
| 226 | * NOTE: This path does not handle barrier, but barrier is not supported |
| 227 | * on ide-cd anyway. |
| 228 | */ |
| 229 | |
| 230 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, |
| 231 | int uptodate, int nr_sectors) |
| 232 | { |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 233 | BUG_ON(!blk_rq_started(rq)); |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 234 | |
Bartlomiej Zolnierkiewicz | a72b214 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 235 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
Alan Cox | dbe217a | 2006-06-25 05:47:44 -0700 | [diff] [blame] | 236 | } |
| 237 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); |
| 238 | |
| 239 | |
| 240 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | * ide_complete_pm_request - end the current Power Management request |
| 242 | * @drive: target drive |
| 243 | * @rq: request |
| 244 | * |
| 245 | * This function cleans up the current PM request and stops the queue |
| 246 | * if necessary. |
| 247 | */ |
| 248 | static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) |
| 249 | { |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 250 | struct request_queue *q = drive->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | unsigned long flags; |
| 252 | |
| 253 | #ifdef DEBUG_PM |
| 254 | printk("%s: completing PM request, %s\n", drive->name, |
| 255 | blk_pm_suspend_request(rq) ? "suspend" : "resume"); |
| 256 | #endif |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 257 | spin_lock_irqsave(q->queue_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (blk_pm_suspend_request(rq)) { |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 259 | blk_stop_queue(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } else { |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 261 | drive->dev_flags &= ~IDE_DFLAG_BLOCKED; |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 262 | blk_start_queue(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 264 | spin_unlock_irqrestore(q->queue_lock, flags); |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 265 | |
| 266 | drive->hwif->hwgroup->rq = NULL; |
| 267 | |
Bartlomiej Zolnierkiewicz | 3c8a2cc | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 268 | if (blk_end_request(rq, 0, 0)) |
Kiyoshi Ueda | 5e36bb6 | 2008-01-28 10:34:20 +0100 | [diff] [blame] | 269 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | } |
| 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | /** |
| 273 | * ide_end_drive_cmd - end an explicit drive command |
| 274 | * @drive: command |
| 275 | * @stat: status bits |
| 276 | * @err: error bits |
| 277 | * |
| 278 | * Clean up after success/failure of an explicit drive command. |
| 279 | * These get thrown onto the queue so they are synchronized with |
| 280 | * real I/O operations on the drive. |
| 281 | * |
| 282 | * In LBA48 mode we have to read the register set twice to get |
| 283 | * all the extra information out. |
| 284 | */ |
| 285 | |
| 286 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) |
| 287 | { |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 288 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
| 289 | struct request *rq = hwgroup->rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Bartlomiej Zolnierkiewicz | 7267c33 | 2008-01-26 20:13:13 +0100 | [diff] [blame] | 291 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
Bartlomiej Zolnierkiewicz | 395d8ef | 2008-02-11 00:32:14 +0100 | [diff] [blame] | 292 | ide_task_t *task = (ide_task_t *)rq->special; |
| 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | if (rq->errors == 0) |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 295 | rq->errors = !OK_STAT(stat, ATA_DRDY, BAD_STAT); |
Bartlomiej Zolnierkiewicz | 395d8ef | 2008-02-11 00:32:14 +0100 | [diff] [blame] | 296 | |
| 297 | if (task) { |
| 298 | struct ide_taskfile *tf = &task->tf; |
Bartlomiej Zolnierkiewicz | 650d841 | 2008-01-25 22:17:06 +0100 | [diff] [blame] | 299 | |
Bartlomiej Zolnierkiewicz | 650d841 | 2008-01-25 22:17:06 +0100 | [diff] [blame] | 300 | tf->error = err; |
Bartlomiej Zolnierkiewicz | 650d841 | 2008-01-25 22:17:06 +0100 | [diff] [blame] | 301 | tf->status = stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 303 | drive->hwif->tp_ops->tf_read(drive, task); |
Bartlomiej Zolnierkiewicz | 395d8ef | 2008-02-11 00:32:14 +0100 | [diff] [blame] | 304 | |
| 305 | if (task->tf_flags & IDE_TFLAG_DYN) |
| 306 | kfree(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | } else if (blk_pm_request(rq)) { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 309 | struct request_pm_state *pm = rq->data; |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 310 | |
| 311 | ide_complete_power_step(drive, rq); |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 312 | if (pm->pm_step == IDE_PM_COMPLETED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | ide_complete_pm_request(drive, rq); |
| 314 | return; |
| 315 | } |
| 316 | |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 317 | hwgroup->rq = NULL; |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | rq->errors = err; |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 320 | |
Bartlomiej Zolnierkiewicz | 3c8a2cc | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 321 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
| 322 | blk_rq_bytes(rq)))) |
Kiyoshi Ueda | 5e36bb6 | 2008-01-28 10:34:20 +0100 | [diff] [blame] | 323 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | EXPORT_SYMBOL(ide_end_drive_cmd); |
| 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | static void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
| 328 | { |
| 329 | if (rq->rq_disk) { |
| 330 | ide_driver_t *drv; |
| 331 | |
| 332 | drv = *(ide_driver_t **)rq->rq_disk->private_data; |
| 333 | drv->end_request(drive, 0, 0); |
| 334 | } else |
| 335 | ide_end_request(drive, 0, 0); |
| 336 | } |
| 337 | |
| 338 | static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
| 339 | { |
| 340 | ide_hwif_t *hwif = drive->hwif; |
| 341 | |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 342 | if ((stat & ATA_BUSY) || |
| 343 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | /* other bits are useless when BUSY */ |
| 345 | rq->errors |= ERROR_RESET; |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 346 | } else if (stat & ATA_ERR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /* err has different meaning on cdrom and tape */ |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 348 | if (err == ATA_ABORTED) { |
Bartlomiej Zolnierkiewicz | d1d7671 | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 349 | if ((drive->dev_flags & IDE_DFLAG_LBA) && |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 350 | /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ |
| 351 | hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | return ide_stopped; |
| 353 | } else if ((err & BAD_CRC) == BAD_CRC) { |
| 354 | /* UDMA crc error, just retry the operation */ |
| 355 | drive->crc_count++; |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 356 | } else if (err & (ATA_BBK | ATA_UNC)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* retries won't help these */ |
| 358 | rq->errors = ERROR_MAX; |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 359 | } else if (err & ATA_TRK0NF) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | /* help it find track zero */ |
| 361 | rq->errors |= ERROR_RECAL; |
| 362 | } |
| 363 | } |
| 364 | |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 365 | if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && |
Bartlomiej Zolnierkiewicz | 57279a7 | 2008-07-15 21:21:47 +0200 | [diff] [blame] | 366 | (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { |
| 367 | int nsect = drive->mult_count ? drive->mult_count : 1; |
| 368 | |
| 369 | ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); |
| 370 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 372 | if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | ide_kill_rq(drive, rq); |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 374 | return ide_stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 376 | |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 377 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 378 | rq->errors |= ERROR_RESET; |
| 379 | |
| 380 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
| 381 | ++rq->errors; |
| 382 | return ide_do_reset(drive); |
| 383 | } |
| 384 | |
| 385 | if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) |
| 386 | drive->special.b.recalibrate = 1; |
| 387 | |
| 388 | ++rq->errors; |
| 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | return ide_stopped; |
| 391 | } |
| 392 | |
| 393 | static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
| 394 | { |
| 395 | ide_hwif_t *hwif = drive->hwif; |
| 396 | |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 397 | if ((stat & ATA_BUSY) || |
| 398 | ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | /* other bits are useless when BUSY */ |
| 400 | rq->errors |= ERROR_RESET; |
| 401 | } else { |
| 402 | /* add decoding error stuff */ |
| 403 | } |
| 404 | |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 405 | if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | /* force an abort */ |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 407 | hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
| 409 | if (rq->errors >= ERROR_MAX) { |
| 410 | ide_kill_rq(drive, rq); |
| 411 | } else { |
| 412 | if ((rq->errors & ERROR_RESET) == ERROR_RESET) { |
| 413 | ++rq->errors; |
| 414 | return ide_do_reset(drive); |
| 415 | } |
| 416 | ++rq->errors; |
| 417 | } |
| 418 | |
| 419 | return ide_stopped; |
| 420 | } |
| 421 | |
| 422 | ide_startstop_t |
| 423 | __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) |
| 424 | { |
| 425 | if (drive->media == ide_disk) |
| 426 | return ide_ata_error(drive, rq, stat, err); |
| 427 | return ide_atapi_error(drive, rq, stat, err); |
| 428 | } |
| 429 | |
| 430 | EXPORT_SYMBOL_GPL(__ide_error); |
| 431 | |
| 432 | /** |
| 433 | * ide_error - handle an error on the IDE |
| 434 | * @drive: drive the error occurred on |
| 435 | * @msg: message to report |
| 436 | * @stat: status bits |
| 437 | * |
| 438 | * ide_error() takes action based on the error returned by the drive. |
| 439 | * For normal I/O that may well include retries. We deal with |
| 440 | * both new-style (taskfile) and old style command handling here. |
| 441 | * In the case of taskfile command handling there is work left to |
| 442 | * do |
| 443 | */ |
| 444 | |
| 445 | ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat) |
| 446 | { |
| 447 | struct request *rq; |
| 448 | u8 err; |
| 449 | |
| 450 | err = ide_dump_status(drive, msg, stat); |
| 451 | |
| 452 | if ((rq = HWGROUP(drive)->rq) == NULL) |
| 453 | return ide_stopped; |
| 454 | |
| 455 | /* retry only "normal" I/O: */ |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 456 | if (!blk_fs_request(rq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | rq->errors = 1; |
| 458 | ide_end_drive_cmd(drive, stat, err); |
| 459 | return ide_stopped; |
| 460 | } |
| 461 | |
| 462 | if (rq->rq_disk) { |
| 463 | ide_driver_t *drv; |
| 464 | |
| 465 | drv = *(ide_driver_t **)rq->rq_disk->private_data; |
| 466 | return drv->error(drive, rq, stat, err); |
| 467 | } else |
| 468 | return __ide_error(drive, rq, stat, err); |
| 469 | } |
| 470 | |
| 471 | EXPORT_SYMBOL_GPL(ide_error); |
| 472 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 473 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 475 | tf->nsect = drive->sect; |
| 476 | tf->lbal = drive->sect; |
| 477 | tf->lbam = drive->cyl; |
| 478 | tf->lbah = drive->cyl >> 8; |
Bartlomiej Zolnierkiewicz | 7f612f2 | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 479 | tf->device = (drive->head - 1) | drive->select; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 480 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 483 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 485 | tf->nsect = drive->sect; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 486 | tf->command = ATA_CMD_RESTORE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
| 488 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 489 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 491 | tf->nsect = drive->mult_req; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 492 | tf->command = ATA_CMD_SET_MULTI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) |
| 496 | { |
| 497 | special_t *s = &drive->special; |
| 498 | ide_task_t args; |
| 499 | |
| 500 | memset(&args, 0, sizeof(ide_task_t)); |
Bartlomiej Zolnierkiewicz | ac026ff | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 501 | args.data_phase = TASKFILE_NO_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | if (s->b.set_geometry) { |
| 504 | s->b.set_geometry = 0; |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 505 | ide_tf_set_specify_cmd(drive, &args.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } else if (s->b.recalibrate) { |
| 507 | s->b.recalibrate = 0; |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 508 | ide_tf_set_restore_cmd(drive, &args.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } else if (s->b.set_multmode) { |
| 510 | s->b.set_multmode = 0; |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 511 | ide_tf_set_setmult_cmd(drive, &args.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } else if (s->all) { |
| 513 | int special = s->all; |
| 514 | s->all = 0; |
| 515 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); |
| 516 | return ide_stopped; |
| 517 | } |
| 518 | |
Bartlomiej Zolnierkiewicz | 657cc1a | 2008-01-26 20:13:10 +0100 | [diff] [blame] | 519 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 520 | IDE_TFLAG_CUSTOM_HANDLER; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | do_rw_taskfile(drive, &args); |
| 523 | |
| 524 | return ide_started; |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * do_special - issue some special commands |
| 529 | * @drive: drive the command is for |
| 530 | * |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 531 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
| 532 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. |
| 533 | * |
| 534 | * It used to do much more, but has been scaled back. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | */ |
| 536 | |
| 537 | static ide_startstop_t do_special (ide_drive_t *drive) |
| 538 | { |
| 539 | special_t *s = &drive->special; |
| 540 | |
| 541 | #ifdef DEBUG |
| 542 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); |
| 543 | #endif |
Bartlomiej Zolnierkiewicz | 6982daf | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 544 | if (drive->media == ide_disk) |
| 545 | return ide_disk_special(drive); |
Bartlomiej Zolnierkiewicz | 26bcb87 | 2007-10-11 23:54:00 +0200 | [diff] [blame] | 546 | |
Bartlomiej Zolnierkiewicz | 6982daf | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 547 | s->all = 0; |
| 548 | drive->mult_req = 0; |
| 549 | return ide_stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | void ide_map_sg(ide_drive_t *drive, struct request *rq) |
| 553 | { |
| 554 | ide_hwif_t *hwif = drive->hwif; |
| 555 | struct scatterlist *sg = hwif->sg_table; |
| 556 | |
| 557 | if (hwif->sg_mapped) /* needed by ide-scsi */ |
| 558 | return; |
| 559 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 560 | if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
| 562 | } else { |
| 563 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
| 564 | hwif->sg_nents = 1; |
| 565 | } |
| 566 | } |
| 567 | |
| 568 | EXPORT_SYMBOL_GPL(ide_map_sg); |
| 569 | |
| 570 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) |
| 571 | { |
| 572 | ide_hwif_t *hwif = drive->hwif; |
| 573 | |
| 574 | hwif->nsect = hwif->nleft = rq->nr_sectors; |
Jens Axboe | 55c16a7 | 2007-07-25 08:13:56 +0200 | [diff] [blame] | 575 | hwif->cursg_ofs = 0; |
| 576 | hwif->cursg = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } |
| 578 | |
| 579 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
| 580 | |
| 581 | /** |
| 582 | * execute_drive_command - issue special drive command |
Adrian Bunk | 338cec3 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 583 | * @drive: the drive to issue the command on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | * @rq: the request structure holding the command |
| 585 | * |
| 586 | * execute_drive_cmd() issues a special drive command, usually |
| 587 | * initiated by ioctl() from the external hdparm program. The |
| 588 | * command can be a drive command, drive task or taskfile |
| 589 | * operation. Weirdly you can call it with NULL to wait for |
| 590 | * all commands to finish. Don't do this as that is due to change |
| 591 | */ |
| 592 | |
| 593 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, |
| 594 | struct request *rq) |
| 595 | { |
| 596 | ide_hwif_t *hwif = HWIF(drive); |
Bartlomiej Zolnierkiewicz | 7267c33 | 2008-01-26 20:13:13 +0100 | [diff] [blame] | 597 | ide_task_t *task = rq->special; |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 598 | |
Bartlomiej Zolnierkiewicz | 7267c33 | 2008-01-26 20:13:13 +0100 | [diff] [blame] | 599 | if (task) { |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 600 | hwif->data_phase = task->data_phase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
| 602 | switch (hwif->data_phase) { |
| 603 | case TASKFILE_MULTI_OUT: |
| 604 | case TASKFILE_OUT: |
| 605 | case TASKFILE_MULTI_IN: |
| 606 | case TASKFILE_IN: |
| 607 | ide_init_sg_cmd(drive, rq); |
| 608 | ide_map_sg(drive, rq); |
| 609 | default: |
| 610 | break; |
| 611 | } |
| 612 | |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 613 | return do_rw_taskfile(drive, task); |
| 614 | } |
| 615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | /* |
| 617 | * NULL is actually a valid way of waiting for |
| 618 | * all current requests to be flushed from the queue. |
| 619 | */ |
| 620 | #ifdef DEBUG |
| 621 | printk("%s: DRIVE_CMD (null)\n", drive->name); |
| 622 | #endif |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 623 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
Bartlomiej Zolnierkiewicz | b73c7ee | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 624 | ide_read_error(drive)); |
Bartlomiej Zolnierkiewicz | 64a57fe | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | return ide_stopped; |
| 627 | } |
| 628 | |
Elias Oltmanns | 92f1f8f | 2008-10-10 22:39:40 +0200 | [diff] [blame] | 629 | int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting, |
| 630 | int arg) |
| 631 | { |
| 632 | struct request_queue *q = drive->queue; |
| 633 | struct request *rq; |
| 634 | int ret = 0; |
| 635 | |
| 636 | if (!(setting->flags & DS_SYNC)) |
| 637 | return setting->set(drive, arg); |
| 638 | |
Elias Oltmanns | e415e49 | 2008-10-13 21:39:45 +0200 | [diff] [blame] | 639 | rq = blk_get_request(q, READ, __GFP_WAIT); |
Elias Oltmanns | 92f1f8f | 2008-10-10 22:39:40 +0200 | [diff] [blame] | 640 | rq->cmd_type = REQ_TYPE_SPECIAL; |
| 641 | rq->cmd_len = 5; |
| 642 | rq->cmd[0] = REQ_DEVSET_EXEC; |
| 643 | *(int *)&rq->cmd[1] = arg; |
| 644 | rq->special = setting->set; |
| 645 | |
| 646 | if (blk_execute_rq(q, NULL, rq, 0)) |
| 647 | ret = rq->errors; |
| 648 | blk_put_request(rq); |
| 649 | |
| 650 | return ret; |
| 651 | } |
| 652 | EXPORT_SYMBOL_GPL(ide_devset_execute); |
| 653 | |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 654 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
| 655 | { |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 656 | u8 cmd = rq->cmd[0]; |
| 657 | |
| 658 | if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) { |
| 659 | ide_task_t task; |
| 660 | struct ide_taskfile *tf = &task.tf; |
| 661 | |
| 662 | memset(&task, 0, sizeof(task)); |
| 663 | if (cmd == REQ_PARK_HEADS) { |
| 664 | drive->sleep = *(unsigned long *)rq->special; |
| 665 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
| 666 | tf->command = ATA_CMD_IDLEIMMEDIATE; |
| 667 | tf->feature = 0x44; |
| 668 | tf->lbal = 0x4c; |
| 669 | tf->lbam = 0x4e; |
| 670 | tf->lbah = 0x55; |
| 671 | task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER; |
| 672 | } else /* cmd == REQ_UNPARK_HEADS */ |
| 673 | tf->command = ATA_CMD_CHK_POWER; |
| 674 | |
| 675 | task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE; |
| 676 | task.rq = rq; |
| 677 | drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA; |
| 678 | return do_rw_taskfile(drive, &task); |
| 679 | } |
| 680 | |
| 681 | switch (cmd) { |
Elias Oltmanns | 92f1f8f | 2008-10-10 22:39:40 +0200 | [diff] [blame] | 682 | case REQ_DEVSET_EXEC: |
| 683 | { |
| 684 | int err, (*setfunc)(ide_drive_t *, int) = rq->special; |
| 685 | |
| 686 | err = setfunc(drive, *(int *)&rq->cmd[1]); |
| 687 | if (err) |
| 688 | rq->errors = err; |
| 689 | else |
| 690 | err = 1; |
| 691 | ide_end_request(drive, err, 0); |
| 692 | return ide_stopped; |
| 693 | } |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 694 | case REQ_DRIVE_RESET: |
| 695 | return ide_do_reset(drive); |
| 696 | default: |
| 697 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); |
| 698 | ide_end_request(drive, 0, 0); |
| 699 | return ide_stopped; |
| 700 | } |
| 701 | } |
| 702 | |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 703 | static void ide_check_pm_state(ide_drive_t *drive, struct request *rq) |
| 704 | { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 705 | struct request_pm_state *pm = rq->data; |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 706 | |
| 707 | if (blk_pm_suspend_request(rq) && |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 708 | pm->pm_step == IDE_PM_START_SUSPEND) |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 709 | /* Mark drive blocked when starting the suspend sequence. */ |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 710 | drive->dev_flags |= IDE_DFLAG_BLOCKED; |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 711 | else if (blk_pm_resume_request(rq) && |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 712 | pm->pm_step == IDE_PM_START_RESUME) { |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 713 | /* |
| 714 | * The first thing we do on wakeup is to wait for BSY bit to |
| 715 | * go away (with a looong timeout) as a drive on this hwif may |
| 716 | * just be POSTing itself. |
| 717 | * We do that before even selecting as the "other" device on |
| 718 | * the bus may be broken enough to walk on our toes at this |
| 719 | * point. |
| 720 | */ |
Bartlomiej Zolnierkiewicz | 6e6afb3 | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 721 | ide_hwif_t *hwif = drive->hwif; |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 722 | int rc; |
| 723 | #ifdef DEBUG_PM |
| 724 | printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); |
| 725 | #endif |
Bartlomiej Zolnierkiewicz | 6e6afb3 | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 726 | rc = ide_wait_not_busy(hwif, 35000); |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 727 | if (rc) |
| 728 | printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); |
| 729 | SELECT_DRIVE(drive); |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 730 | hwif->tp_ops->set_irq(hwif, 1); |
Bartlomiej Zolnierkiewicz | 6e6afb3 | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 731 | rc = ide_wait_not_busy(hwif, 100000); |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 732 | if (rc) |
| 733 | printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); |
| 734 | } |
| 735 | } |
| 736 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | /** |
| 738 | * start_request - start of I/O and command issuing for IDE |
| 739 | * |
| 740 | * start_request() initiates handling of a new I/O request. It |
Bartlomiej Zolnierkiewicz | 3c619ff | 2008-10-10 22:39:22 +0200 | [diff] [blame] | 741 | * accepts commands and I/O (read/write) requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | * |
| 743 | * FIXME: this function needs a rename |
| 744 | */ |
| 745 | |
| 746 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) |
| 747 | { |
| 748 | ide_startstop_t startstop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 750 | BUG_ON(!blk_rq_started(rq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | #ifdef DEBUG |
| 753 | printk("%s: start_request: current=0x%08lx\n", |
| 754 | HWIF(drive)->name, (unsigned long) rq); |
| 755 | #endif |
| 756 | |
| 757 | /* bail early if we've exceeded max_failures */ |
| 758 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
Aristeu Rozanski | b5e1a4e | 2008-01-25 22:17:04 +0100 | [diff] [blame] | 759 | rq->cmd_flags |= REQ_FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | goto kill_rq; |
| 761 | } |
| 762 | |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 763 | if (blk_pm_request(rq)) |
| 764 | ide_check_pm_state(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | SELECT_DRIVE(drive); |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 767 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
| 768 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
| 770 | return startstop; |
| 771 | } |
| 772 | if (!drive->special.all) { |
| 773 | ide_driver_t *drv; |
| 774 | |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 775 | /* |
| 776 | * We reset the drive so we need to issue a SETFEATURES. |
| 777 | * Do it _after_ do_special() restored device parameters. |
| 778 | */ |
| 779 | if (drive->current_speed == 0xff) |
| 780 | ide_config_drive_speed(drive, drive->desired_speed); |
| 781 | |
Bartlomiej Zolnierkiewicz | 7267c33 | 2008-01-26 20:13:13 +0100 | [diff] [blame] | 782 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | return execute_drive_cmd(drive, rq); |
| 784 | else if (blk_pm_request(rq)) { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 785 | struct request_pm_state *pm = rq->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | #ifdef DEBUG_PM |
| 787 | printk("%s: start_power_step(step: %d)\n", |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 788 | drive->name, pm->pm_step); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | #endif |
| 790 | startstop = ide_start_power_step(drive, rq); |
| 791 | if (startstop == ide_stopped && |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 792 | pm->pm_step == IDE_PM_COMPLETED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | ide_complete_pm_request(drive, rq); |
| 794 | return startstop; |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 795 | } else if (!rq->rq_disk && blk_special_request(rq)) |
| 796 | /* |
| 797 | * TODO: Once all ULDs have been modified to |
| 798 | * check for specific op codes rather than |
| 799 | * blindly accepting any special request, the |
| 800 | * check for ->rq_disk above may be replaced |
| 801 | * by a more suitable mechanism or even |
| 802 | * dropped entirely. |
| 803 | */ |
| 804 | return ide_special_rq(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
| 806 | drv = *(ide_driver_t **)rq->rq_disk->private_data; |
Bartlomiej Zolnierkiewicz | 3c619ff | 2008-10-10 22:39:22 +0200 | [diff] [blame] | 807 | |
| 808 | return drv->do_request(drive, rq, rq->sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | } |
| 810 | return do_special(drive); |
| 811 | kill_rq: |
| 812 | ide_kill_rq(drive, rq); |
| 813 | return ide_stopped; |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * ide_stall_queue - pause an IDE device |
| 818 | * @drive: drive to stall |
| 819 | * @timeout: time to stall for (jiffies) |
| 820 | * |
| 821 | * ide_stall_queue() can be used by a drive to give excess bandwidth back |
| 822 | * to the hwgroup by sleeping for timeout jiffies. |
| 823 | */ |
| 824 | |
| 825 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) |
| 826 | { |
| 827 | if (timeout > WAIT_WORSTCASE) |
| 828 | timeout = WAIT_WORSTCASE; |
| 829 | drive->sleep = timeout + jiffies; |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 830 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | EXPORT_SYMBOL(ide_stall_queue); |
| 834 | |
| 835 | #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time) |
| 836 | |
| 837 | /** |
| 838 | * choose_drive - select a drive to service |
| 839 | * @hwgroup: hardware group to select on |
| 840 | * |
| 841 | * choose_drive() selects the next drive which will be serviced. |
| 842 | * This is necessary because the IDE layer can't issue commands |
| 843 | * to both drives on the same cable, unlike SCSI. |
| 844 | */ |
| 845 | |
| 846 | static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup) |
| 847 | { |
| 848 | ide_drive_t *drive, *best; |
| 849 | |
| 850 | repeat: |
| 851 | best = NULL; |
| 852 | drive = hwgroup->drive; |
| 853 | |
| 854 | /* |
| 855 | * drive is doing pre-flush, ordered write, post-flush sequence. even |
| 856 | * though that is 3 requests, it must be seen as a single transaction. |
| 857 | * we must not preempt this drive until that is complete |
| 858 | */ |
| 859 | if (blk_queue_flushing(drive->queue)) { |
| 860 | /* |
| 861 | * small race where queue could get replugged during |
| 862 | * the 3-request flush cycle, just yank the plug since |
| 863 | * we want it to finish asap |
| 864 | */ |
| 865 | blk_remove_plug(drive->queue); |
| 866 | return drive; |
| 867 | } |
| 868 | |
| 869 | do { |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 870 | u8 dev_s = !!(drive->dev_flags & IDE_DFLAG_SLEEPING); |
| 871 | u8 best_s = (best && !!(best->dev_flags & IDE_DFLAG_SLEEPING)); |
| 872 | |
| 873 | if ((dev_s == 0 || time_after_eq(jiffies, drive->sleep)) && |
| 874 | !elv_queue_empty(drive->queue)) { |
| 875 | if (best == NULL || |
| 876 | (dev_s && (best_s == 0 || time_before(drive->sleep, best->sleep))) || |
| 877 | (best_s == 0 && time_before(WAKEUP(drive), WAKEUP(best)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | if (!blk_queue_plugged(drive->queue)) |
| 879 | best = drive; |
| 880 | } |
| 881 | } |
| 882 | } while ((drive = drive->next) != hwgroup->drive); |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 883 | |
| 884 | if (best && (best->dev_flags & IDE_DFLAG_NICE1) && |
| 885 | (best->dev_flags & IDE_DFLAG_SLEEPING) == 0 && |
| 886 | best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | long t = (signed long)(WAKEUP(best) - jiffies); |
| 888 | if (t >= WAIT_MIN_SLEEP) { |
| 889 | /* |
| 890 | * We *may* have some time to spare, but first let's see if |
| 891 | * someone can potentially benefit from our nice mood today.. |
| 892 | */ |
| 893 | drive = best->next; |
| 894 | do { |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 895 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) == 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | && time_before(jiffies - best->service_time, WAKEUP(drive)) |
| 897 | && time_before(WAKEUP(drive), jiffies + t)) |
| 898 | { |
| 899 | ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP)); |
| 900 | goto repeat; |
| 901 | } |
| 902 | } while ((drive = drive->next) != best); |
| 903 | } |
| 904 | } |
| 905 | return best; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Issue a new request to a drive from hwgroup |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 910 | * Caller must have already done spin_lock_irqsave(&hwgroup->lock, ..); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | * |
| 912 | * A hwgroup is a serialized group of IDE interfaces. Usually there is |
| 913 | * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640) |
| 914 | * may have both interfaces in a single hwgroup to "serialize" access. |
| 915 | * Or possibly multiple ISA interfaces can share a common IRQ by being grouped |
| 916 | * together into one hwgroup for serialized access. |
| 917 | * |
| 918 | * Note also that several hwgroups can end up sharing a single IRQ, |
| 919 | * possibly along with many other devices. This is especially common in |
| 920 | * PCI-based systems with off-board IDE controller cards. |
| 921 | * |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 922 | * The IDE driver uses a per-hwgroup spinlock to protect |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | * access to the request queues, and to protect the hwgroup->busy flag. |
| 924 | * |
| 925 | * The first thread into the driver for a particular hwgroup sets the |
| 926 | * hwgroup->busy flag to indicate that this hwgroup is now active, |
| 927 | * and then initiates processing of the top request from the request queue. |
| 928 | * |
| 929 | * Other threads attempting entry notice the busy setting, and will simply |
| 930 | * queue their new requests and exit immediately. Note that hwgroup->busy |
| 931 | * remains set even when the driver is merely awaiting the next interrupt. |
| 932 | * Thus, the meaning is "this hwgroup is busy processing a request". |
| 933 | * |
| 934 | * When processing of a request completes, the completing thread or IRQ-handler |
| 935 | * will start the next request from the queue. If no more work remains, |
| 936 | * the driver will clear the hwgroup->busy flag and exit. |
| 937 | * |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 938 | * The per-hwgroup spinlock is used to protect all access to the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | * hwgroup->busy flag, but is otherwise not needed for most processing in |
| 940 | * the driver. This makes the driver much more friendlier to shared IRQs |
| 941 | * than previous designs, while remaining 100% (?) SMP safe and capable. |
| 942 | */ |
| 943 | static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq) |
| 944 | { |
| 945 | ide_drive_t *drive; |
| 946 | ide_hwif_t *hwif; |
| 947 | struct request *rq; |
| 948 | ide_startstop_t startstop; |
Benjamin Herrenschmidt | 867f8b4 | 2005-10-09 10:37:47 +1000 | [diff] [blame] | 949 | int loops = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 951 | /* caller must own hwgroup->lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | BUG_ON(!irqs_disabled()); |
| 953 | |
| 954 | while (!hwgroup->busy) { |
| 955 | hwgroup->busy = 1; |
Michael Schmitz | f9e3326 | 2008-12-02 20:40:02 +0100 | [diff] [blame] | 956 | /* for atari only */ |
| 957 | ide_get_lock(ide_intr, hwgroup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | drive = choose_drive(hwgroup); |
| 959 | if (drive == NULL) { |
| 960 | int sleeping = 0; |
| 961 | unsigned long sleep = 0; /* shut up, gcc */ |
| 962 | hwgroup->rq = NULL; |
| 963 | drive = hwgroup->drive; |
| 964 | do { |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 965 | if ((drive->dev_flags & IDE_DFLAG_SLEEPING) && |
| 966 | (sleeping == 0 || |
| 967 | time_before(drive->sleep, sleep))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | sleeping = 1; |
| 969 | sleep = drive->sleep; |
| 970 | } |
| 971 | } while ((drive = drive->next) != hwgroup->drive); |
| 972 | if (sleeping) { |
| 973 | /* |
| 974 | * Take a short snooze, and then wake up this hwgroup again. |
| 975 | * This gives other hwgroups on the same a chance to |
| 976 | * play fairly with us, just in case there are big differences |
| 977 | * in relative throughputs.. don't want to hog the cpu too much. |
| 978 | */ |
| 979 | if (time_before(sleep, jiffies + WAIT_MIN_SLEEP)) |
| 980 | sleep = jiffies + WAIT_MIN_SLEEP; |
| 981 | #if 1 |
| 982 | if (timer_pending(&hwgroup->timer)) |
| 983 | printk(KERN_CRIT "ide_set_handler: timer already active\n"); |
| 984 | #endif |
| 985 | /* so that ide_timer_expiry knows what to do */ |
| 986 | hwgroup->sleeping = 1; |
Suleiman Souhlal | 2345031 | 2007-04-10 22:38:37 +0200 | [diff] [blame] | 987 | hwgroup->req_gen_timer = hwgroup->req_gen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | mod_timer(&hwgroup->timer, sleep); |
| 989 | /* we purposely leave hwgroup->busy==1 |
| 990 | * while sleeping */ |
| 991 | } else { |
| 992 | /* Ugly, but how can we sleep for the lock |
| 993 | * otherwise? perhaps from tq_disk? |
| 994 | */ |
| 995 | |
| 996 | /* for atari only */ |
| 997 | ide_release_lock(); |
| 998 | hwgroup->busy = 0; |
| 999 | } |
| 1000 | |
| 1001 | /* no more work for this hwgroup (for now) */ |
| 1002 | return; |
| 1003 | } |
Benjamin Herrenschmidt | 867f8b4 | 2005-10-09 10:37:47 +1000 | [diff] [blame] | 1004 | again: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | hwif = HWIF(drive); |
Bartlomiej Zolnierkiewicz | 81ca691 | 2008-01-26 20:13:08 +0100 | [diff] [blame] | 1006 | if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) { |
Bartlomiej Zolnierkiewicz | 7299a39 | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 1007 | /* |
| 1008 | * set nIEN for previous hwif, drives in the |
| 1009 | * quirk_list may not like intr setups/cleanups |
| 1010 | */ |
Bartlomiej Zolnierkiewicz | 46aa7af | 2008-12-29 20:27:33 +0100 | [diff] [blame^] | 1011 | if (drive->quirk_list == 0) |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1012 | hwif->tp_ops->set_irq(hwif, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | } |
| 1014 | hwgroup->hwif = hwif; |
| 1015 | hwgroup->drive = drive; |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 1016 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | drive->service_start = jiffies; |
| 1018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | /* |
| 1020 | * we know that the queue isn't empty, but this can happen |
| 1021 | * if the q->prep_rq_fn() decides to kill a request |
| 1022 | */ |
| 1023 | rq = elv_next_request(drive->queue); |
| 1024 | if (!rq) { |
| 1025 | hwgroup->busy = 0; |
| 1026 | break; |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * Sanity: don't accept a request that isn't a PM request |
| 1031 | * if we are currently power managed. This is very important as |
| 1032 | * blk_stop_queue() doesn't prevent the elv_next_request() |
| 1033 | * above to return us whatever is in the queue. Since we call |
| 1034 | * ide_do_request() ourselves, we end up taking requests while |
| 1035 | * the queue is blocked... |
| 1036 | * |
| 1037 | * We let requests forced at head of queue with ide-preempt |
| 1038 | * though. I hope that doesn't happen too much, hopefully not |
| 1039 | * unless the subdriver triggers such a thing in its own PM |
| 1040 | * state machine. |
Benjamin Herrenschmidt | 867f8b4 | 2005-10-09 10:37:47 +1000 | [diff] [blame] | 1041 | * |
| 1042 | * We count how many times we loop here to make sure we service |
| 1043 | * all drives in the hwgroup without looping for ever |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | */ |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 1045 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
| 1046 | blk_pm_request(rq) == 0 && |
| 1047 | (rq->cmd_flags & REQ_PREEMPT) == 0) { |
Benjamin Herrenschmidt | 867f8b4 | 2005-10-09 10:37:47 +1000 | [diff] [blame] | 1048 | drive = drive->next ? drive->next : hwgroup->drive; |
| 1049 | if (loops++ < 4 && !blk_queue_plugged(drive->queue)) |
| 1050 | goto again; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | /* We clear busy, there should be no pending ATA command at this point. */ |
| 1052 | hwgroup->busy = 0; |
| 1053 | break; |
| 1054 | } |
| 1055 | |
| 1056 | hwgroup->rq = rq; |
| 1057 | |
| 1058 | /* |
| 1059 | * Some systems have trouble with IDE IRQs arriving while |
| 1060 | * the driver is still setting things up. So, here we disable |
| 1061 | * the IRQ used by this interface while the request is being started. |
| 1062 | * This may look bad at first, but pretty much the same thing |
| 1063 | * happens anyway when any interrupt comes in, IDE or otherwise |
| 1064 | * -- the kernel masks the IRQ while it is being handled. |
| 1065 | */ |
| 1066 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) |
| 1067 | disable_irq_nosync(hwif->irq); |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1068 | spin_unlock(&hwgroup->lock); |
Ingo Molnar | 366c7f5 | 2006-07-03 00:25:25 -0700 | [diff] [blame] | 1069 | local_irq_enable_in_hardirq(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | /* allow other IRQs while we start this request */ |
| 1071 | startstop = start_request(drive, rq); |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1072 | spin_lock_irq(&hwgroup->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq) |
| 1074 | enable_irq(hwif->irq); |
| 1075 | if (startstop == ide_stopped) |
| 1076 | hwgroup->busy = 0; |
| 1077 | } |
| 1078 | } |
| 1079 | |
| 1080 | /* |
| 1081 | * Passes the stuff to ide_do_request |
| 1082 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 1083 | void do_ide_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | { |
| 1085 | ide_drive_t *drive = q->queuedata; |
| 1086 | |
| 1087 | ide_do_request(HWGROUP(drive), IDE_NO_IRQ); |
| 1088 | } |
| 1089 | |
| 1090 | /* |
| 1091 | * un-busy the hwgroup etc, and clear any pending DMA status. we want to |
| 1092 | * retry the current request in pio mode instead of risking tossing it |
| 1093 | * all away |
| 1094 | */ |
| 1095 | static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) |
| 1096 | { |
| 1097 | ide_hwif_t *hwif = HWIF(drive); |
| 1098 | struct request *rq; |
| 1099 | ide_startstop_t ret = ide_stopped; |
| 1100 | |
| 1101 | /* |
| 1102 | * end current dma transaction |
| 1103 | */ |
| 1104 | |
| 1105 | if (error < 0) { |
| 1106 | printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 1107 | (void)hwif->dma_ops->dma_end(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | ret = ide_error(drive, "dma timeout error", |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1109 | hwif->tp_ops->read_status(hwif)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | } else { |
| 1111 | printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 1112 | hwif->dma_ops->dma_timeout(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | * disable dma for now, but remember that we did so because of |
| 1117 | * a timeout -- we'll reenable after we finish this next request |
| 1118 | * (or rather the first chunk of it) in pio. |
| 1119 | */ |
Bartlomiej Zolnierkiewicz | c392204 | 2008-10-13 21:39:37 +0200 | [diff] [blame] | 1120 | drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | drive->retry_pio++; |
Bartlomiej Zolnierkiewicz | 4a546e0 | 2008-01-26 20:13:01 +0100 | [diff] [blame] | 1122 | ide_dma_off_quietly(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | |
| 1124 | /* |
| 1125 | * un-busy drive etc (hwgroup->busy is cleared on return) and |
| 1126 | * make sure request is sane |
| 1127 | */ |
| 1128 | rq = HWGROUP(drive)->rq; |
Hua Zhong | ce42f19 | 2006-10-03 01:14:15 -0700 | [diff] [blame] | 1129 | |
| 1130 | if (!rq) |
| 1131 | goto out; |
| 1132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | HWGROUP(drive)->rq = NULL; |
| 1134 | |
| 1135 | rq->errors = 0; |
| 1136 | |
| 1137 | if (!rq->bio) |
| 1138 | goto out; |
| 1139 | |
| 1140 | rq->sector = rq->bio->bi_sector; |
| 1141 | rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9; |
| 1142 | rq->hard_cur_sectors = rq->current_nr_sectors; |
| 1143 | rq->buffer = bio_data(rq->bio); |
| 1144 | out: |
| 1145 | return ret; |
| 1146 | } |
| 1147 | |
| 1148 | /** |
| 1149 | * ide_timer_expiry - handle lack of an IDE interrupt |
| 1150 | * @data: timer callback magic (hwgroup) |
| 1151 | * |
| 1152 | * An IDE command has timed out before the expected drive return |
| 1153 | * occurred. At this point we attempt to clean up the current |
| 1154 | * mess. If the current handler includes an expiry handler then |
| 1155 | * we invoke the expiry handler, and providing it is happy the |
| 1156 | * work is done. If that fails we apply generic recovery rules |
| 1157 | * invoking the handler and checking the drive DMA status. We |
| 1158 | * have an excessively incestuous relationship with the DMA |
| 1159 | * logic that wants cleaning up. |
| 1160 | */ |
| 1161 | |
| 1162 | void ide_timer_expiry (unsigned long data) |
| 1163 | { |
| 1164 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data; |
| 1165 | ide_handler_t *handler; |
| 1166 | ide_expiry_t *expiry; |
| 1167 | unsigned long flags; |
| 1168 | unsigned long wait = -1; |
| 1169 | |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1170 | spin_lock_irqsave(&hwgroup->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | |
Suleiman Souhlal | 2345031 | 2007-04-10 22:38:37 +0200 | [diff] [blame] | 1172 | if (((handler = hwgroup->handler) == NULL) || |
| 1173 | (hwgroup->req_gen != hwgroup->req_gen_timer)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | /* |
| 1175 | * Either a marginal timeout occurred |
| 1176 | * (got the interrupt just as timer expired), |
| 1177 | * or we were "sleeping" to give other devices a chance. |
| 1178 | * Either way, we don't really want to complain about anything. |
| 1179 | */ |
| 1180 | if (hwgroup->sleeping) { |
| 1181 | hwgroup->sleeping = 0; |
| 1182 | hwgroup->busy = 0; |
| 1183 | } |
| 1184 | } else { |
| 1185 | ide_drive_t *drive = hwgroup->drive; |
| 1186 | if (!drive) { |
| 1187 | printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n"); |
| 1188 | hwgroup->handler = NULL; |
| 1189 | } else { |
| 1190 | ide_hwif_t *hwif; |
| 1191 | ide_startstop_t startstop = ide_stopped; |
| 1192 | if (!hwgroup->busy) { |
| 1193 | hwgroup->busy = 1; /* paranoia */ |
| 1194 | printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name); |
| 1195 | } |
| 1196 | if ((expiry = hwgroup->expiry) != NULL) { |
| 1197 | /* continue */ |
| 1198 | if ((wait = expiry(drive)) > 0) { |
| 1199 | /* reset timer */ |
| 1200 | hwgroup->timer.expires = jiffies + wait; |
Suleiman Souhlal | 2345031 | 2007-04-10 22:38:37 +0200 | [diff] [blame] | 1201 | hwgroup->req_gen_timer = hwgroup->req_gen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | add_timer(&hwgroup->timer); |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1203 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | return; |
| 1205 | } |
| 1206 | } |
| 1207 | hwgroup->handler = NULL; |
| 1208 | /* |
| 1209 | * We need to simulate a real interrupt when invoking |
| 1210 | * the handler() function, which means we need to |
| 1211 | * globally mask the specific IRQ: |
| 1212 | */ |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1213 | spin_unlock(&hwgroup->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | hwif = HWIF(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | /* disable_irq_nosync ?? */ |
| 1216 | disable_irq(hwif->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | /* local CPU only, |
| 1218 | * as if we were handling an interrupt */ |
| 1219 | local_irq_disable(); |
| 1220 | if (hwgroup->polling) { |
| 1221 | startstop = handler(drive); |
| 1222 | } else if (drive_is_ready(drive)) { |
| 1223 | if (drive->waiting_for_dma) |
Bartlomiej Zolnierkiewicz | 5e37bdc | 2008-04-26 22:25:24 +0200 | [diff] [blame] | 1224 | hwif->dma_ops->dma_lost_irq(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | (void)ide_ack_intr(hwif); |
| 1226 | printk(KERN_WARNING "%s: lost interrupt\n", drive->name); |
| 1227 | startstop = handler(drive); |
| 1228 | } else { |
| 1229 | if (drive->waiting_for_dma) { |
| 1230 | startstop = ide_dma_timeout_retry(drive, wait); |
| 1231 | } else |
| 1232 | startstop = |
Bartlomiej Zolnierkiewicz | c47137a | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 1233 | ide_error(drive, "irq timeout", |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1234 | hwif->tp_ops->read_status(hwif)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | } |
| 1236 | drive->service_time = jiffies - drive->service_start; |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1237 | spin_lock_irq(&hwgroup->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | enable_irq(hwif->irq); |
| 1239 | if (startstop == ide_stopped) |
| 1240 | hwgroup->busy = 0; |
| 1241 | } |
| 1242 | } |
| 1243 | ide_do_request(hwgroup, IDE_NO_IRQ); |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1244 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | /** |
| 1248 | * unexpected_intr - handle an unexpected IDE interrupt |
| 1249 | * @irq: interrupt line |
| 1250 | * @hwgroup: hwgroup being processed |
| 1251 | * |
| 1252 | * There's nothing really useful we can do with an unexpected interrupt, |
| 1253 | * other than reading the status register (to clear it), and logging it. |
| 1254 | * There should be no way that an irq can happen before we're ready for it, |
| 1255 | * so we needn't worry much about losing an "important" interrupt here. |
| 1256 | * |
| 1257 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever |
| 1258 | * the drive enters "idle", "standby", or "sleep" mode, so if the status |
| 1259 | * looks "good", we just ignore the interrupt completely. |
| 1260 | * |
| 1261 | * This routine assumes __cli() is in effect when called. |
| 1262 | * |
| 1263 | * If an unexpected interrupt happens on irq15 while we are handling irq14 |
| 1264 | * and if the two interfaces are "serialized" (CMD640), then it looks like |
| 1265 | * we could screw up by interfering with a new request being set up for |
| 1266 | * irq15. |
| 1267 | * |
| 1268 | * In reality, this is a non-issue. The new command is not sent unless |
| 1269 | * the drive is ready to accept one, in which case we know the drive is |
| 1270 | * not trying to interrupt us. And ide_set_handler() is always invoked |
| 1271 | * before completing the issuance of any new drive command, so we will not |
| 1272 | * be accidentally invoked as a result of any valid command completion |
| 1273 | * interrupt. |
| 1274 | * |
| 1275 | * Note that we must walk the entire hwgroup here. We know which hwif |
| 1276 | * is doing the current command, but we don't know which hwif burped |
| 1277 | * mysteriously. |
| 1278 | */ |
| 1279 | |
| 1280 | static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup) |
| 1281 | { |
| 1282 | u8 stat; |
| 1283 | ide_hwif_t *hwif = hwgroup->hwif; |
| 1284 | |
| 1285 | /* |
| 1286 | * handle the unexpected interrupt |
| 1287 | */ |
| 1288 | do { |
| 1289 | if (hwif->irq == irq) { |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1290 | stat = hwif->tp_ops->read_status(hwif); |
Bartlomiej Zolnierkiewicz | b73c7ee | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 1291 | |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 1292 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | /* Try to not flood the console with msgs */ |
| 1294 | static unsigned long last_msgtime, count; |
| 1295 | ++count; |
| 1296 | if (time_after(jiffies, last_msgtime + HZ)) { |
| 1297 | last_msgtime = jiffies; |
| 1298 | printk(KERN_ERR "%s%s: unexpected interrupt, " |
| 1299 | "status=0x%02x, count=%ld\n", |
| 1300 | hwif->name, |
| 1301 | (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count); |
| 1302 | } |
| 1303 | } |
| 1304 | } |
| 1305 | } while ((hwif = hwif->next) != hwgroup->hwif); |
| 1306 | } |
| 1307 | |
| 1308 | /** |
| 1309 | * ide_intr - default IDE interrupt handler |
| 1310 | * @irq: interrupt number |
| 1311 | * @dev_id: hwif group |
| 1312 | * @regs: unused weirdness from the kernel irq layer |
| 1313 | * |
| 1314 | * This is the default IRQ handler for the IDE layer. You should |
| 1315 | * not need to override it. If you do be aware it is subtle in |
| 1316 | * places |
| 1317 | * |
| 1318 | * hwgroup->hwif is the interface in the group currently performing |
| 1319 | * a command. hwgroup->drive is the drive and hwgroup->handler is |
| 1320 | * the IRQ handler to call. As we issue a command the handlers |
| 1321 | * step through multiple states, reassigning the handler to the |
| 1322 | * next step in the process. Unlike a smart SCSI controller IDE |
| 1323 | * expects the main processor to sequence the various transfer |
| 1324 | * stages. We also manage a poll timer to catch up with most |
| 1325 | * timeout situations. There are still a few where the handlers |
| 1326 | * don't ever decide to give up. |
| 1327 | * |
| 1328 | * The handler eventually returns ide_stopped to indicate the |
| 1329 | * request completed. At this point we issue the next request |
| 1330 | * on the hwgroup and the process begins again. |
| 1331 | */ |
| 1332 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1333 | irqreturn_t ide_intr (int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | { |
| 1335 | unsigned long flags; |
| 1336 | ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id; |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1337 | ide_hwif_t *hwif = hwgroup->hwif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | ide_drive_t *drive; |
| 1339 | ide_handler_t *handler; |
| 1340 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1341 | irqreturn_t irq_ret = IRQ_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1343 | spin_lock_irqsave(&hwgroup->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1345 | if (!ide_ack_intr(hwif)) |
| 1346 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | |
| 1348 | if ((handler = hwgroup->handler) == NULL || hwgroup->polling) { |
| 1349 | /* |
| 1350 | * Not expecting an interrupt from this drive. |
| 1351 | * That means this could be: |
| 1352 | * (1) an interrupt from another PCI device |
| 1353 | * sharing the same PCI INT# as us. |
| 1354 | * or (2) a drive just entered sleep or standby mode, |
| 1355 | * and is interrupting to let us know. |
| 1356 | * or (3) a spurious interrupt of unknown origin. |
| 1357 | * |
| 1358 | * For PCI, we cannot tell the difference, |
| 1359 | * so in that case we just ignore it and hope it goes away. |
| 1360 | * |
| 1361 | * FIXME: unexpected_intr should be hwif-> then we can |
| 1362 | * remove all the ifdef PCI crap |
| 1363 | */ |
| 1364 | #ifdef CONFIG_BLK_DEV_IDEPCI |
Bartlomiej Zolnierkiewicz | 425afb6 | 2008-02-01 23:09:31 +0100 | [diff] [blame] | 1365 | if (hwif->chipset != ide_pci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| 1367 | { |
| 1368 | /* |
| 1369 | * Probably not a shared PCI interrupt, |
| 1370 | * so we can safely try to do something about it: |
| 1371 | */ |
| 1372 | unexpected_intr(irq, hwgroup); |
| 1373 | #ifdef CONFIG_BLK_DEV_IDEPCI |
| 1374 | } else { |
| 1375 | /* |
| 1376 | * Whack the status register, just in case |
| 1377 | * we have a leftover pending IRQ. |
| 1378 | */ |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1379 | (void)hwif->tp_ops->read_status(hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| 1381 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1382 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | drive = hwgroup->drive; |
| 1386 | if (!drive) { |
| 1387 | /* |
| 1388 | * This should NEVER happen, and there isn't much |
| 1389 | * we could do about it here. |
| 1390 | * |
| 1391 | * [Note - this can occur if the drive is hot unplugged] |
| 1392 | */ |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1393 | goto out_handled; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1395 | |
| 1396 | if (!drive_is_ready(drive)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | /* |
| 1398 | * This happens regularly when we share a PCI IRQ with |
| 1399 | * another device. Unfortunately, it can also happen |
| 1400 | * with some buggy drives that trigger the IRQ before |
| 1401 | * their status register is up to date. Hopefully we have |
| 1402 | * enough advance overhead that the latter isn't a problem. |
| 1403 | */ |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1404 | goto out; |
| 1405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | if (!hwgroup->busy) { |
| 1407 | hwgroup->busy = 1; /* paranoia */ |
| 1408 | printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name); |
| 1409 | } |
| 1410 | hwgroup->handler = NULL; |
Suleiman Souhlal | 2345031 | 2007-04-10 22:38:37 +0200 | [diff] [blame] | 1411 | hwgroup->req_gen++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | del_timer(&hwgroup->timer); |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1413 | spin_unlock(&hwgroup->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | |
Bartlomiej Zolnierkiewicz | bfa7d8e | 2008-10-13 21:39:42 +0200 | [diff] [blame] | 1415 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
| 1416 | hwif->port_ops->clear_irq(drive); |
Albert Lee | f0dd871 | 2007-02-17 02:40:21 +0100 | [diff] [blame] | 1417 | |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 1418 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
Ingo Molnar | 366c7f5 | 2006-07-03 00:25:25 -0700 | [diff] [blame] | 1419 | local_irq_enable_in_hardirq(); |
Bartlomiej Zolnierkiewicz | bfa7d8e | 2008-10-13 21:39:42 +0200 | [diff] [blame] | 1420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | /* service this interrupt, may set handler for next interrupt */ |
| 1422 | startstop = handler(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1424 | spin_lock_irq(&hwgroup->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | /* |
| 1426 | * Note that handler() may have set things up for another |
| 1427 | * interrupt to occur soon, but it cannot happen until |
| 1428 | * we exit from this routine, because it will be the |
| 1429 | * same irq as is currently being serviced here, and Linux |
| 1430 | * won't allow another of the same (on any CPU) until we return. |
| 1431 | */ |
| 1432 | drive->service_time = jiffies - drive->service_start; |
| 1433 | if (startstop == ide_stopped) { |
| 1434 | if (hwgroup->handler == NULL) { /* paranoia */ |
| 1435 | hwgroup->busy = 0; |
| 1436 | ide_do_request(hwgroup, hwif->irq); |
| 1437 | } else { |
| 1438 | printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler " |
| 1439 | "on exit\n", drive->name); |
| 1440 | } |
| 1441 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1442 | out_handled: |
| 1443 | irq_ret = IRQ_HANDLED; |
| 1444 | out: |
Bartlomiej Zolnierkiewicz | 2a2ca6a | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1445 | spin_unlock_irqrestore(&hwgroup->lock, flags); |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 1446 | return irq_ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | } |
| 1448 | |
| 1449 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | * ide_do_drive_cmd - issue IDE special command |
| 1451 | * @drive: device to issue command |
| 1452 | * @rq: request to issue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | * |
| 1454 | * This function issues a special IDE device request |
| 1455 | * onto the request queue. |
| 1456 | * |
FUJITA Tomonori | 63f5abb | 2008-07-15 21:21:51 +0200 | [diff] [blame] | 1457 | * the rq is queued at the head of the request queue, displacing |
| 1458 | * the currently-being-processed request and this function |
| 1459 | * returns immediately without waiting for the new rq to be |
| 1460 | * completed. This is VERY DANGEROUS, and is intended for |
| 1461 | * careful use by the ATAPI tape/cdrom driver code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | */ |
FUJITA Tomonori | 63f5abb | 2008-07-15 21:21:51 +0200 | [diff] [blame] | 1463 | |
| 1464 | void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | { |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 1466 | ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1467 | struct request_queue *q = drive->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | unsigned long flags; |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 1469 | |
| 1470 | hwgroup->rq = NULL; |
Bartlomiej Zolnierkiewicz | e8a96aa | 2008-07-15 21:21:41 +0200 | [diff] [blame] | 1471 | |
Bartlomiej Zolnierkiewicz | 6ea5222 | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 1472 | spin_lock_irqsave(q->queue_lock, flags); |
| 1473 | __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0); |
| 1474 | blk_start_queueing(q); |
| 1475 | spin_unlock_irqrestore(q->queue_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | EXPORT_SYMBOL(ide_do_drive_cmd); |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1478 | |
| 1479 | void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma) |
| 1480 | { |
Bartlomiej Zolnierkiewicz | 6e6afb3 | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 1481 | ide_hwif_t *hwif = drive->hwif; |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1482 | ide_task_t task; |
| 1483 | |
| 1484 | memset(&task, 0, sizeof(task)); |
| 1485 | task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM | |
| 1486 | IDE_TFLAG_OUT_FEATURE | tf_flags; |
| 1487 | task.tf.feature = dma; /* Use PIO/DMA */ |
| 1488 | task.tf.lbam = bcount & 0xff; |
| 1489 | task.tf.lbah = (bcount >> 8) & 0xff; |
| 1490 | |
Bartlomiej Zolnierkiewicz | 089c5c7 | 2008-04-28 23:44:39 +0200 | [diff] [blame] | 1491 | ide_tf_dump(drive->name, &task.tf); |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1492 | hwif->tp_ops->set_irq(hwif, 1); |
Bartlomiej Zolnierkiewicz | ed4af48 | 2008-07-15 21:21:48 +0200 | [diff] [blame] | 1493 | SELECT_MASK(drive, 0); |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1494 | hwif->tp_ops->tf_load(drive, &task); |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1495 | } |
| 1496 | |
| 1497 | EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 1498 | |
| 1499 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
| 1500 | { |
| 1501 | ide_hwif_t *hwif = drive->hwif; |
| 1502 | u8 buf[4] = { 0 }; |
| 1503 | |
| 1504 | while (len > 0) { |
| 1505 | if (write) |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1506 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 1507 | else |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 1508 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 1509 | len -= 4; |
| 1510 | } |
| 1511 | } |
| 1512 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |