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) |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 91 | drive->hwif->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 | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 110 | struct request *rq = drive->hwif->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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | /** |
Alan Cox | dbe217a | 2006-06-25 05:47:44 -0700 | [diff] [blame] | 124 | * ide_end_dequeued_request - complete an IDE I/O |
| 125 | * @drive: IDE device for the I/O |
| 126 | * @uptodate: |
| 127 | * @nr_sectors: number of sectors completed |
| 128 | * |
| 129 | * Complete an I/O that is no longer on the request queue. This |
| 130 | * typically occurs when we pull the request and issue a REQUEST_SENSE. |
| 131 | * We must still finish the old request but we must not tamper with the |
| 132 | * queue in the meantime. |
| 133 | * |
| 134 | * NOTE: This path does not handle barrier, but barrier is not supported |
| 135 | * on ide-cd anyway. |
| 136 | */ |
| 137 | |
| 138 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, |
| 139 | int uptodate, int nr_sectors) |
| 140 | { |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 141 | BUG_ON(!blk_rq_started(rq)); |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 142 | |
Bartlomiej Zolnierkiewicz | a72b214 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 143 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
Alan Cox | dbe217a | 2006-06-25 05:47:44 -0700 | [diff] [blame] | 144 | } |
| 145 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); |
| 146 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 147 | void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 148 | { |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 149 | struct ide_taskfile *tf = &cmd->tf; |
| 150 | struct request *rq = cmd->rq; |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 151 | |
| 152 | tf->error = err; |
| 153 | tf->status = stat; |
| 154 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 155 | drive->hwif->tp_ops->tf_read(drive, cmd); |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 156 | |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 157 | if (rq && rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 158 | memcpy(rq->special, cmd, sizeof(*cmd)); |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 159 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 160 | if (cmd->tf_flags & IDE_TFLAG_DYN) |
| 161 | kfree(cmd); |
Bartlomiej Zolnierkiewicz | e120237 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 162 | } |
| 163 | |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 164 | void ide_complete_rq(ide_drive_t *drive, u8 err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 166 | ide_hwif_t *hwif = drive->hwif; |
| 167 | struct request *rq = hwif->rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 169 | hwif->rq = NULL; |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | rq->errors = err; |
Bartlomiej Zolnierkiewicz | 1d0bf58 | 2008-12-29 20:27:30 +0100 | [diff] [blame] | 172 | |
Bartlomiej Zolnierkiewicz | 3c8a2cc | 2008-12-29 20:27:31 +0100 | [diff] [blame] | 173 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
| 174 | blk_rq_bytes(rq)))) |
Kiyoshi Ueda | 5e36bb6 | 2008-01-28 10:34:20 +0100 | [diff] [blame] | 175 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
Bartlomiej Zolnierkiewicz | a09485d | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 177 | EXPORT_SYMBOL(ide_complete_rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
Bartlomiej Zolnierkiewicz | 327fa1c | 2009-03-24 23:22:47 +0100 | [diff] [blame] | 179 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
Bartlomiej Zolnierkiewicz | 3ee3830 | 2009-03-27 12:46:36 +0100 | [diff] [blame] | 181 | u8 drv_req = blk_special_request(rq) && rq->rq_disk; |
| 182 | u8 media = drive->media; |
| 183 | |
Bartlomiej Zolnierkiewicz | c152cc1 | 2009-03-27 12:46:34 +0100 | [diff] [blame] | 184 | drive->failed_pc = NULL; |
| 185 | |
Bartlomiej Zolnierkiewicz | 3ee3830 | 2009-03-27 12:46:36 +0100 | [diff] [blame] | 186 | if ((media == ide_floppy && drv_req) || media == ide_tape) |
Bartlomiej Zolnierkiewicz | c152cc1 | 2009-03-27 12:46:34 +0100 | [diff] [blame] | 187 | rq->errors = IDE_DRV_ERROR_GENERAL; |
| 188 | |
Bartlomiej Zolnierkiewicz | 3ee3830 | 2009-03-27 12:46:36 +0100 | [diff] [blame] | 189 | if ((media == ide_floppy || media == ide_tape) && drv_req) |
| 190 | ide_complete_rq(drive, 0); |
| 191 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | ide_end_request(drive, 0, 0); |
| 193 | } |
| 194 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 195 | 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] | 196 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 197 | tf->nsect = drive->sect; |
| 198 | tf->lbal = drive->sect; |
| 199 | tf->lbam = drive->cyl; |
| 200 | tf->lbah = drive->cyl >> 8; |
Bartlomiej Zolnierkiewicz | 7f612f2 | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 201 | tf->device = (drive->head - 1) | drive->select; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 202 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 205 | 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] | 206 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 207 | tf->nsect = drive->sect; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 208 | tf->command = ATA_CMD_RESTORE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 211 | 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] | 212 | { |
Bartlomiej Zolnierkiewicz | 57d7366 | 2008-01-25 22:17:16 +0100 | [diff] [blame] | 213 | tf->nsect = drive->mult_req; |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 214 | tf->command = ATA_CMD_SET_MULTI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) |
| 218 | { |
| 219 | special_t *s = &drive->special; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 220 | struct ide_cmd cmd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 222 | memset(&cmd, 0, sizeof(cmd)); |
| 223 | cmd.data_phase = TASKFILE_NO_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | if (s->b.set_geometry) { |
| 226 | s->b.set_geometry = 0; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 227 | ide_tf_set_specify_cmd(drive, &cmd.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } else if (s->b.recalibrate) { |
| 229 | s->b.recalibrate = 0; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 230 | ide_tf_set_restore_cmd(drive, &cmd.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } else if (s->b.set_multmode) { |
| 232 | s->b.set_multmode = 0; |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 233 | ide_tf_set_setmult_cmd(drive, &cmd.tf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } else if (s->all) { |
| 235 | int special = s->all; |
| 236 | s->all = 0; |
| 237 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); |
| 238 | return ide_stopped; |
| 239 | } |
| 240 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 241 | cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
| 242 | IDE_TFLAG_CUSTOM_HANDLER; |
Bartlomiej Zolnierkiewicz | 74095a9 | 2008-01-25 22:17:07 +0100 | [diff] [blame] | 243 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 244 | do_rw_taskfile(drive, &cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | return ide_started; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * do_special - issue some special commands |
| 251 | * @drive: drive the command is for |
| 252 | * |
Bartlomiej Zolnierkiewicz | aaaade3 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 253 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
| 254 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. |
| 255 | * |
| 256 | * It used to do much more, but has been scaled back. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | */ |
| 258 | |
| 259 | static ide_startstop_t do_special (ide_drive_t *drive) |
| 260 | { |
| 261 | special_t *s = &drive->special; |
| 262 | |
| 263 | #ifdef DEBUG |
| 264 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); |
| 265 | #endif |
Bartlomiej Zolnierkiewicz | 6982daf | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 266 | if (drive->media == ide_disk) |
| 267 | return ide_disk_special(drive); |
Bartlomiej Zolnierkiewicz | 26bcb87 | 2007-10-11 23:54:00 +0200 | [diff] [blame] | 268 | |
Bartlomiej Zolnierkiewicz | 6982daf | 2008-10-13 21:39:40 +0200 | [diff] [blame] | 269 | s->all = 0; |
| 270 | drive->mult_req = 0; |
| 271 | return ide_stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | void ide_map_sg(ide_drive_t *drive, struct request *rq) |
| 275 | { |
| 276 | ide_hwif_t *hwif = drive->hwif; |
| 277 | struct scatterlist *sg = hwif->sg_table; |
| 278 | |
Borislav Petkov | 9e772d0 | 2009-02-02 20:12:21 +0100 | [diff] [blame] | 279 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
| 281 | hwif->sg_nents = 1; |
Borislav Petkov | 9e772d0 | 2009-02-02 20:12:21 +0100 | [diff] [blame] | 282 | } else if (!rq->bio) { |
| 283 | sg_init_one(sg, rq->data, rq->data_len); |
| 284 | hwif->sg_nents = 1; |
| 285 | } else { |
| 286 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | } |
| 288 | } |
| 289 | |
| 290 | EXPORT_SYMBOL_GPL(ide_map_sg); |
| 291 | |
| 292 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) |
| 293 | { |
| 294 | ide_hwif_t *hwif = drive->hwif; |
| 295 | |
| 296 | hwif->nsect = hwif->nleft = rq->nr_sectors; |
Jens Axboe | 55c16a7 | 2007-07-25 08:13:56 +0200 | [diff] [blame] | 297 | hwif->cursg_ofs = 0; |
| 298 | hwif->cursg = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
| 302 | |
| 303 | /** |
| 304 | * execute_drive_command - issue special drive command |
Adrian Bunk | 338cec3 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 305 | * @drive: the drive to issue the command on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | * @rq: the request structure holding the command |
| 307 | * |
| 308 | * execute_drive_cmd() issues a special drive command, usually |
| 309 | * initiated by ioctl() from the external hdparm program. The |
| 310 | * command can be a drive command, drive task or taskfile |
| 311 | * operation. Weirdly you can call it with NULL to wait for |
| 312 | * all commands to finish. Don't do this as that is due to change |
| 313 | */ |
| 314 | |
| 315 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, |
| 316 | struct request *rq) |
| 317 | { |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 318 | struct ide_cmd *cmd = rq->special; |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 319 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 320 | if (cmd) { |
| 321 | switch (cmd->data_phase) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | case TASKFILE_MULTI_OUT: |
| 323 | case TASKFILE_OUT: |
| 324 | case TASKFILE_MULTI_IN: |
| 325 | case TASKFILE_IN: |
| 326 | ide_init_sg_cmd(drive, rq); |
| 327 | ide_map_sg(drive, rq); |
| 328 | default: |
| 329 | break; |
| 330 | } |
| 331 | |
Bartlomiej Zolnierkiewicz | 22aa4b3 | 2009-03-27 12:46:37 +0100 | [diff] [blame] | 332 | return do_rw_taskfile(drive, cmd); |
Bartlomiej Zolnierkiewicz | 21d535c | 2008-01-25 22:17:09 +0100 | [diff] [blame] | 333 | } |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /* |
| 336 | * NULL is actually a valid way of waiting for |
| 337 | * all current requests to be flushed from the queue. |
| 338 | */ |
| 339 | #ifdef DEBUG |
| 340 | printk("%s: DRIVE_CMD (null)\n", drive->name); |
| 341 | #endif |
Bartlomiej Zolnierkiewicz | 5e76acd | 2009-03-27 12:46:31 +0100 | [diff] [blame] | 342 | ide_complete_rq(drive, 0); |
Bartlomiej Zolnierkiewicz | 64a57fe | 2008-02-06 02:57:51 +0100 | [diff] [blame] | 343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | return ide_stopped; |
| 345 | } |
| 346 | |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 347 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
| 348 | { |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 349 | u8 cmd = rq->cmd[0]; |
| 350 | |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 351 | switch (cmd) { |
Bartlomiej Zolnierkiewicz | 1bc6daa | 2009-03-24 23:22:44 +0100 | [diff] [blame] | 352 | case REQ_PARK_HEADS: |
| 353 | case REQ_UNPARK_HEADS: |
| 354 | return ide_do_park_unpark(drive, rq); |
Elias Oltmanns | 92f1f8f | 2008-10-10 22:39:40 +0200 | [diff] [blame] | 355 | case REQ_DEVSET_EXEC: |
Bartlomiej Zolnierkiewicz | 1bc6daa | 2009-03-24 23:22:44 +0100 | [diff] [blame] | 356 | return ide_do_devset(drive, rq); |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 357 | case REQ_DRIVE_RESET: |
| 358 | return ide_do_reset(drive); |
| 359 | default: |
| 360 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); |
| 361 | ide_end_request(drive, 0, 0); |
| 362 | return ide_stopped; |
| 363 | } |
| 364 | } |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | /** |
| 367 | * start_request - start of I/O and command issuing for IDE |
| 368 | * |
| 369 | * start_request() initiates handling of a new I/O request. It |
Bartlomiej Zolnierkiewicz | 3c619ff | 2008-10-10 22:39:22 +0200 | [diff] [blame] | 370 | * accepts commands and I/O (read/write) requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | * |
| 372 | * FIXME: this function needs a rename |
| 373 | */ |
| 374 | |
| 375 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) |
| 376 | { |
| 377 | ide_startstop_t startstop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 379 | BUG_ON(!blk_rq_started(rq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
| 381 | #ifdef DEBUG |
| 382 | printk("%s: start_request: current=0x%08lx\n", |
Bartlomiej Zolnierkiewicz | 898ec22 | 2009-01-06 17:20:52 +0100 | [diff] [blame] | 383 | drive->hwif->name, (unsigned long) rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | #endif |
| 385 | |
| 386 | /* bail early if we've exceeded max_failures */ |
| 387 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
Aristeu Rozanski | b5e1a4e | 2008-01-25 22:17:04 +0100 | [diff] [blame] | 388 | rq->cmd_flags |= REQ_FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | goto kill_rq; |
| 390 | } |
| 391 | |
Jens Axboe | ad3cadd | 2006-06-13 08:46:57 +0200 | [diff] [blame] | 392 | if (blk_pm_request(rq)) |
| 393 | ide_check_pm_state(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | SELECT_DRIVE(drive); |
Bartlomiej Zolnierkiewicz | 3a7d248 | 2008-10-10 22:39:21 +0200 | [diff] [blame] | 396 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
| 397 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
| 399 | return startstop; |
| 400 | } |
| 401 | if (!drive->special.all) { |
Bartlomiej Zolnierkiewicz | 7f3c868 | 2009-01-06 17:20:53 +0100 | [diff] [blame] | 402 | struct ide_driver *drv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Suleiman Souhlal | 513daad | 2007-03-26 23:03:20 +0200 | [diff] [blame] | 404 | /* |
| 405 | * We reset the drive so we need to issue a SETFEATURES. |
| 406 | * Do it _after_ do_special() restored device parameters. |
| 407 | */ |
| 408 | if (drive->current_speed == 0xff) |
| 409 | ide_config_drive_speed(drive, drive->desired_speed); |
| 410 | |
Bartlomiej Zolnierkiewicz | 7267c33 | 2008-01-26 20:13:13 +0100 | [diff] [blame] | 411 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return execute_drive_cmd(drive, rq); |
| 413 | else if (blk_pm_request(rq)) { |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 414 | struct request_pm_state *pm = rq->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | #ifdef DEBUG_PM |
| 416 | printk("%s: start_power_step(step: %d)\n", |
Bartlomiej Zolnierkiewicz | 6b7d8fc | 2008-12-02 20:40:03 +0100 | [diff] [blame] | 417 | drive->name, pm->pm_step); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | #endif |
| 419 | startstop = ide_start_power_step(drive, rq); |
| 420 | if (startstop == ide_stopped && |
Bartlomiej Zolnierkiewicz | 0d346ba | 2008-10-13 21:39:38 +0200 | [diff] [blame] | 421 | pm->pm_step == IDE_PM_COMPLETED) |
Bartlomiej Zolnierkiewicz | 3616b65 | 2009-03-27 12:46:29 +0100 | [diff] [blame] | 422 | ide_complete_pm_rq(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | return startstop; |
Elias Oltmanns | 79e36a9 | 2008-07-16 20:33:48 +0200 | [diff] [blame] | 424 | } else if (!rq->rq_disk && blk_special_request(rq)) |
| 425 | /* |
| 426 | * TODO: Once all ULDs have been modified to |
| 427 | * check for specific op codes rather than |
| 428 | * blindly accepting any special request, the |
| 429 | * check for ->rq_disk above may be replaced |
| 430 | * by a more suitable mechanism or even |
| 431 | * dropped entirely. |
| 432 | */ |
| 433 | return ide_special_rq(drive, rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Bartlomiej Zolnierkiewicz | 7f3c868 | 2009-01-06 17:20:53 +0100 | [diff] [blame] | 435 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
Bartlomiej Zolnierkiewicz | 3c619ff | 2008-10-10 22:39:22 +0200 | [diff] [blame] | 436 | |
| 437 | return drv->do_request(drive, rq, rq->sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | return do_special(drive); |
| 440 | kill_rq: |
| 441 | ide_kill_rq(drive, rq); |
| 442 | return ide_stopped; |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * ide_stall_queue - pause an IDE device |
| 447 | * @drive: drive to stall |
| 448 | * @timeout: time to stall for (jiffies) |
| 449 | * |
| 450 | * ide_stall_queue() can be used by a drive to give excess bandwidth back |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 451 | * to the port by sleeping for timeout jiffies. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | */ |
| 453 | |
| 454 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) |
| 455 | { |
| 456 | if (timeout > WAIT_WORSTCASE) |
| 457 | timeout = WAIT_WORSTCASE; |
| 458 | drive->sleep = timeout + jiffies; |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 459 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | EXPORT_SYMBOL(ide_stall_queue); |
| 462 | |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 463 | static inline int ide_lock_port(ide_hwif_t *hwif) |
| 464 | { |
| 465 | if (hwif->busy) |
| 466 | return 1; |
| 467 | |
| 468 | hwif->busy = 1; |
| 469 | |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static inline void ide_unlock_port(ide_hwif_t *hwif) |
| 474 | { |
| 475 | hwif->busy = 0; |
| 476 | } |
| 477 | |
| 478 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) |
| 479 | { |
| 480 | int rc = 0; |
| 481 | |
| 482 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 483 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); |
| 484 | if (rc == 0) { |
Bartlomiej Zolnierkiewicz | e354c1d | 2009-03-27 12:46:22 +0100 | [diff] [blame] | 485 | if (host->get_lock) |
| 486 | host->get_lock(ide_intr, hwif); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 487 | } |
| 488 | } |
| 489 | return rc; |
| 490 | } |
| 491 | |
| 492 | static inline void ide_unlock_host(struct ide_host *host) |
| 493 | { |
| 494 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
Bartlomiej Zolnierkiewicz | e354c1d | 2009-03-27 12:46:22 +0100 | [diff] [blame] | 495 | if (host->release_lock) |
| 496 | host->release_lock(); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 497 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
| 498 | } |
| 499 | } |
| 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | /* |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 502 | * Issue a new request to a device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | */ |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 504 | void do_ide_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | { |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 506 | ide_drive_t *drive = q->queuedata; |
| 507 | ide_hwif_t *hwif = drive->hwif; |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 508 | struct ide_host *host = hwif->host; |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 509 | struct request *rq = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | ide_startstop_t startstop; |
| 511 | |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 512 | /* |
| 513 | * drive is doing pre-flush, ordered write, post-flush sequence. even |
| 514 | * though that is 3 requests, it must be seen as a single transaction. |
| 515 | * we must not preempt this drive until that is complete |
| 516 | */ |
| 517 | if (blk_queue_flushing(q)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | /* |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 519 | * small race where queue could get replugged during |
| 520 | * the 3-request flush cycle, just yank the plug since |
| 521 | * we want it to finish asap |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | */ |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 523 | blk_remove_plug(q); |
| 524 | |
| 525 | spin_unlock_irq(q->queue_lock); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 526 | |
| 527 | if (ide_lock_host(host, hwif)) |
| 528 | goto plug_device_2; |
| 529 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 530 | spin_lock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 531 | |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 532 | if (!ide_lock_port(hwif)) { |
Bartlomiej Zolnierkiewicz | 42cf261 | 2009-01-06 17:20:47 +0100 | [diff] [blame] | 533 | ide_hwif_t *prev_port; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 534 | repeat: |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 535 | prev_port = hwif->host->cur_port; |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 536 | hwif->rq = NULL; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 537 | |
| 538 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
| 539 | if (time_before(drive->sleep, jiffies)) { |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 540 | ide_unlock_port(hwif); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 541 | goto plug_device; |
| 542 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 544 | |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 545 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
| 546 | hwif != prev_port) { |
Bartlomiej Zolnierkiewicz | 7299a39 | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 547 | /* |
Bartlomiej Zolnierkiewicz | 42cf261 | 2009-01-06 17:20:47 +0100 | [diff] [blame] | 548 | * set nIEN for previous port, drives in the |
Bartlomiej Zolnierkiewicz | 7299a39 | 2008-01-25 22:17:14 +0100 | [diff] [blame] | 549 | * quirk_list may not like intr setups/cleanups |
| 550 | */ |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 551 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
Bartlomiej Zolnierkiewicz | 42cf261 | 2009-01-06 17:20:47 +0100 | [diff] [blame] | 552 | prev_port->tp_ops->set_irq(prev_port, 0); |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 553 | |
| 554 | hwif->host->cur_port = hwif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 556 | hwif->cur_dev = drive; |
Elias Oltmanns | 4abdc6e | 2008-10-13 21:39:50 +0200 | [diff] [blame] | 557 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 559 | spin_unlock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 560 | spin_lock_irq(q->queue_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | /* |
| 562 | * we know that the queue isn't empty, but this can happen |
| 563 | * if the q->prep_rq_fn() decides to kill a request |
| 564 | */ |
| 565 | rq = elv_next_request(drive->queue); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 566 | spin_unlock_irq(q->queue_lock); |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 567 | spin_lock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | if (!rq) { |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 570 | ide_unlock_port(hwif); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 571 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Sanity: don't accept a request that isn't a PM request |
| 576 | * if we are currently power managed. This is very important as |
| 577 | * blk_stop_queue() doesn't prevent the elv_next_request() |
| 578 | * above to return us whatever is in the queue. Since we call |
| 579 | * ide_do_request() ourselves, we end up taking requests while |
| 580 | * the queue is blocked... |
| 581 | * |
| 582 | * We let requests forced at head of queue with ide-preempt |
| 583 | * though. I hope that doesn't happen too much, hopefully not |
| 584 | * unless the subdriver triggers such a thing in its own PM |
| 585 | * state machine. |
| 586 | */ |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 587 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
| 588 | blk_pm_request(rq) == 0 && |
| 589 | (rq->cmd_flags & REQ_PREEMPT) == 0) { |
Bartlomiej Zolnierkiewicz | 631de37 | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 590 | /* there should be no pending command at this point */ |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 591 | ide_unlock_port(hwif); |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 592 | goto plug_device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 595 | hwif->rq = rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 597 | spin_unlock_irq(&hwif->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | startstop = start_request(drive, rq); |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 599 | spin_lock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 600 | |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 601 | if (startstop == ide_stopped) |
| 602 | goto repeat; |
| 603 | } else |
| 604 | goto plug_device; |
| 605 | out: |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 606 | spin_unlock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 607 | if (rq == NULL) |
| 608 | ide_unlock_host(host); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 609 | spin_lock_irq(q->queue_lock); |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 610 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Bartlomiej Zolnierkiewicz | 295f000 | 2009-01-02 16:12:48 +0100 | [diff] [blame] | 612 | plug_device: |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 613 | spin_unlock_irq(&hwif->lock); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 614 | ide_unlock_host(host); |
| 615 | plug_device_2: |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 616 | spin_lock_irq(q->queue_lock); |
| 617 | |
| 618 | if (!elv_queue_empty(q)) |
| 619 | blk_plug_device(q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | } |
| 621 | |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 622 | static void ide_plug_device(ide_drive_t *drive) |
| 623 | { |
| 624 | struct request_queue *q = drive->queue; |
| 625 | unsigned long flags; |
| 626 | |
| 627 | spin_lock_irqsave(q->queue_lock, flags); |
| 628 | if (!elv_queue_empty(q)) |
| 629 | blk_plug_device(q); |
| 630 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 631 | } |
| 632 | |
Bartlomiej Zolnierkiewicz | b6a45a0 | 2009-03-24 23:22:43 +0100 | [diff] [blame] | 633 | static int drive_is_ready(ide_drive_t *drive) |
| 634 | { |
| 635 | ide_hwif_t *hwif = drive->hwif; |
| 636 | u8 stat = 0; |
| 637 | |
| 638 | if (drive->waiting_for_dma) |
| 639 | return hwif->dma_ops->dma_test_irq(drive); |
| 640 | |
| 641 | if (hwif->io_ports.ctl_addr && |
| 642 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) |
| 643 | stat = hwif->tp_ops->read_altstatus(hwif); |
| 644 | else |
| 645 | /* Note: this may clear a pending IRQ!! */ |
| 646 | stat = hwif->tp_ops->read_status(hwif); |
| 647 | |
| 648 | if (stat & ATA_BUSY) |
| 649 | /* drive busy: definitely not interrupting */ |
| 650 | return 0; |
| 651 | |
| 652 | /* drive ready: *might* be interrupting */ |
| 653 | return 1; |
| 654 | } |
| 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | /** |
| 657 | * ide_timer_expiry - handle lack of an IDE interrupt |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 658 | * @data: timer callback magic (hwif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | * |
| 660 | * An IDE command has timed out before the expected drive return |
| 661 | * occurred. At this point we attempt to clean up the current |
| 662 | * mess. If the current handler includes an expiry handler then |
| 663 | * we invoke the expiry handler, and providing it is happy the |
| 664 | * work is done. If that fails we apply generic recovery rules |
| 665 | * invoking the handler and checking the drive DMA status. We |
| 666 | * have an excessively incestuous relationship with the DMA |
| 667 | * logic that wants cleaning up. |
| 668 | */ |
| 669 | |
| 670 | void ide_timer_expiry (unsigned long data) |
| 671 | { |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 672 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 673 | ide_drive_t *uninitialized_var(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | ide_handler_t *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | unsigned long flags; |
Roel Kluin | e0c6dcd | 2009-03-05 16:10:55 +0100 | [diff] [blame] | 676 | int wait = -1; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 677 | int plug_device = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 679 | spin_lock_irqsave(&hwif->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 681 | handler = hwif->handler; |
| 682 | |
| 683 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | /* |
| 685 | * Either a marginal timeout occurred |
| 686 | * (got the interrupt just as timer expired), |
| 687 | * or we were "sleeping" to give other devices a chance. |
| 688 | * Either way, we don't really want to complain about anything. |
| 689 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | } else { |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 691 | ide_expiry_t *expiry = hwif->expiry; |
| 692 | ide_startstop_t startstop = ide_stopped; |
Bartlomiej Zolnierkiewicz | b2cfb05 | 2009-01-02 16:12:49 +0100 | [diff] [blame] | 693 | |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 694 | drive = hwif->cur_dev; |
| 695 | |
| 696 | if (expiry) { |
| 697 | wait = expiry(drive); |
| 698 | if (wait > 0) { /* continue */ |
| 699 | /* reset timer */ |
| 700 | hwif->timer.expires = jiffies + wait; |
| 701 | hwif->req_gen_timer = hwif->req_gen; |
| 702 | add_timer(&hwif->timer); |
| 703 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 704 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 706 | } |
| 707 | hwif->handler = NULL; |
| 708 | /* |
| 709 | * We need to simulate a real interrupt when invoking |
| 710 | * the handler() function, which means we need to |
| 711 | * globally mask the specific IRQ: |
| 712 | */ |
| 713 | spin_unlock(&hwif->lock); |
| 714 | /* disable_irq_nosync ?? */ |
| 715 | disable_irq(hwif->irq); |
| 716 | /* local CPU only, as if we were handling an interrupt */ |
| 717 | local_irq_disable(); |
| 718 | if (hwif->polling) { |
| 719 | startstop = handler(drive); |
| 720 | } else if (drive_is_ready(drive)) { |
| 721 | if (drive->waiting_for_dma) |
| 722 | hwif->dma_ops->dma_lost_irq(drive); |
Bartlomiej Zolnierkiewicz | d15a613 | 2009-03-27 12:46:21 +0100 | [diff] [blame] | 723 | if (hwif->ack_intr) |
| 724 | hwif->ack_intr(hwif); |
Bartlomiej Zolnierkiewicz | c38714e | 2009-01-06 17:20:59 +0100 | [diff] [blame] | 725 | printk(KERN_WARNING "%s: lost interrupt\n", |
| 726 | drive->name); |
| 727 | startstop = handler(drive); |
| 728 | } else { |
| 729 | if (drive->waiting_for_dma) |
| 730 | startstop = ide_dma_timeout_retry(drive, wait); |
| 731 | else |
| 732 | startstop = ide_error(drive, "irq timeout", |
| 733 | hwif->tp_ops->read_status(hwif)); |
| 734 | } |
| 735 | spin_lock_irq(&hwif->lock); |
| 736 | enable_irq(hwif->irq); |
| 737 | if (startstop == ide_stopped) { |
| 738 | ide_unlock_port(hwif); |
| 739 | plug_device = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
| 741 | } |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 742 | spin_unlock_irqrestore(&hwif->lock, flags); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 743 | |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 744 | if (plug_device) { |
| 745 | ide_unlock_host(hwif->host); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 746 | ide_plug_device(drive); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 747 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | } |
| 749 | |
| 750 | /** |
| 751 | * unexpected_intr - handle an unexpected IDE interrupt |
| 752 | * @irq: interrupt line |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 753 | * @hwif: port being processed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | * |
| 755 | * There's nothing really useful we can do with an unexpected interrupt, |
| 756 | * other than reading the status register (to clear it), and logging it. |
| 757 | * There should be no way that an irq can happen before we're ready for it, |
| 758 | * so we needn't worry much about losing an "important" interrupt here. |
| 759 | * |
| 760 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever |
| 761 | * the drive enters "idle", "standby", or "sleep" mode, so if the status |
| 762 | * looks "good", we just ignore the interrupt completely. |
| 763 | * |
| 764 | * This routine assumes __cli() is in effect when called. |
| 765 | * |
| 766 | * If an unexpected interrupt happens on irq15 while we are handling irq14 |
| 767 | * and if the two interfaces are "serialized" (CMD640), then it looks like |
| 768 | * we could screw up by interfering with a new request being set up for |
| 769 | * irq15. |
| 770 | * |
| 771 | * In reality, this is a non-issue. The new command is not sent unless |
| 772 | * the drive is ready to accept one, in which case we know the drive is |
| 773 | * not trying to interrupt us. And ide_set_handler() is always invoked |
| 774 | * before completing the issuance of any new drive command, so we will not |
| 775 | * be accidentally invoked as a result of any valid command completion |
| 776 | * interrupt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | */ |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 778 | |
| 779 | static void unexpected_intr(int irq, ide_hwif_t *hwif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 781 | u8 stat = hwif->tp_ops->read_status(hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 783 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { |
| 784 | /* Try to not flood the console with msgs */ |
| 785 | static unsigned long last_msgtime, count; |
| 786 | ++count; |
Bartlomiej Zolnierkiewicz | b73c7ee | 2008-07-23 19:55:52 +0200 | [diff] [blame] | 787 | |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 788 | if (time_after(jiffies, last_msgtime + HZ)) { |
| 789 | last_msgtime = jiffies; |
| 790 | printk(KERN_ERR "%s: unexpected interrupt, " |
| 791 | "status=0x%02x, count=%ld\n", |
| 792 | hwif->name, stat, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 794 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | /** |
| 798 | * ide_intr - default IDE interrupt handler |
| 799 | * @irq: interrupt number |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 800 | * @dev_id: hwif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | * @regs: unused weirdness from the kernel irq layer |
| 802 | * |
| 803 | * This is the default IRQ handler for the IDE layer. You should |
| 804 | * not need to override it. If you do be aware it is subtle in |
| 805 | * places |
| 806 | * |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 807 | * hwif is the interface in the group currently performing |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 808 | * a command. hwif->cur_dev is the drive and hwif->handler is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | * the IRQ handler to call. As we issue a command the handlers |
| 810 | * step through multiple states, reassigning the handler to the |
| 811 | * next step in the process. Unlike a smart SCSI controller IDE |
| 812 | * expects the main processor to sequence the various transfer |
| 813 | * stages. We also manage a poll timer to catch up with most |
| 814 | * timeout situations. There are still a few where the handlers |
| 815 | * don't ever decide to give up. |
| 816 | * |
| 817 | * The handler eventually returns ide_stopped to indicate the |
| 818 | * request completed. At this point we issue the next request |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 819 | * on the port and the process begins again. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | */ |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 821 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 822 | irqreturn_t ide_intr (int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | { |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 824 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
Bartlomiej Zolnierkiewicz | 255115fb | 2009-03-27 12:46:27 +0100 | [diff] [blame] | 825 | struct ide_host *host = hwif->host; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 826 | ide_drive_t *uninitialized_var(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | ide_handler_t *handler; |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 828 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 830 | irqreturn_t irq_ret = IRQ_NONE; |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 831 | int plug_device = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
Bartlomiej Zolnierkiewicz | 255115fb | 2009-03-27 12:46:27 +0100 | [diff] [blame] | 833 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
| 834 | if (hwif != host->cur_port) |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 835 | goto out_early; |
| 836 | } |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 837 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 838 | spin_lock_irqsave(&hwif->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Bartlomiej Zolnierkiewicz | d15a613 | 2009-03-27 12:46:21 +0100 | [diff] [blame] | 840 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 841 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 843 | handler = hwif->handler; |
| 844 | |
| 845 | if (handler == NULL || hwif->polling) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | /* |
| 847 | * Not expecting an interrupt from this drive. |
| 848 | * That means this could be: |
| 849 | * (1) an interrupt from another PCI device |
| 850 | * sharing the same PCI INT# as us. |
| 851 | * or (2) a drive just entered sleep or standby mode, |
| 852 | * and is interrupting to let us know. |
| 853 | * or (3) a spurious interrupt of unknown origin. |
| 854 | * |
| 855 | * For PCI, we cannot tell the difference, |
| 856 | * so in that case we just ignore it and hope it goes away. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | */ |
Bartlomiej Zolnierkiewicz | 255115fb | 2009-03-27 12:46:27 +0100 | [diff] [blame] | 858 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | /* |
| 860 | * Probably not a shared PCI interrupt, |
| 861 | * so we can safely try to do something about it: |
| 862 | */ |
Bartlomiej Zolnierkiewicz | bd53cbc | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 863 | unexpected_intr(irq, hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } else { |
| 865 | /* |
| 866 | * Whack the status register, just in case |
| 867 | * we have a leftover pending IRQ. |
| 868 | */ |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 869 | (void)hwif->tp_ops->read_status(hwif); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 871 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 873 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 874 | drive = hwif->cur_dev; |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 875 | |
| 876 | if (!drive_is_ready(drive)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | /* |
| 878 | * This happens regularly when we share a PCI IRQ with |
| 879 | * another device. Unfortunately, it can also happen |
| 880 | * with some buggy drives that trigger the IRQ before |
| 881 | * their status register is up to date. Hopefully we have |
| 882 | * enough advance overhead that the latter isn't a problem. |
| 883 | */ |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 884 | goto out; |
| 885 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 886 | hwif->handler = NULL; |
| 887 | hwif->req_gen++; |
| 888 | del_timer(&hwif->timer); |
| 889 | spin_unlock(&hwif->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
Bartlomiej Zolnierkiewicz | bfa7d8e | 2008-10-13 21:39:42 +0200 | [diff] [blame] | 891 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
| 892 | hwif->port_ops->clear_irq(drive); |
Albert Lee | f0dd871 | 2007-02-17 02:40:21 +0100 | [diff] [blame] | 893 | |
Bartlomiej Zolnierkiewicz | 97100fc | 2008-10-13 21:39:36 +0200 | [diff] [blame] | 894 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
Ingo Molnar | 366c7f5 | 2006-07-03 00:25:25 -0700 | [diff] [blame] | 895 | local_irq_enable_in_hardirq(); |
Bartlomiej Zolnierkiewicz | bfa7d8e | 2008-10-13 21:39:42 +0200 | [diff] [blame] | 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | /* service this interrupt, may set handler for next interrupt */ |
| 898 | startstop = handler(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 900 | spin_lock_irq(&hwif->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | /* |
| 902 | * Note that handler() may have set things up for another |
| 903 | * interrupt to occur soon, but it cannot happen until |
| 904 | * we exit from this routine, because it will be the |
| 905 | * same irq as is currently being serviced here, and Linux |
| 906 | * won't allow another of the same (on any CPU) until we return. |
| 907 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | if (startstop == ide_stopped) { |
Bartlomiej Zolnierkiewicz | 9600dcf | 2009-01-06 17:20:58 +0100 | [diff] [blame] | 909 | BUG_ON(hwif->handler); |
| 910 | ide_unlock_port(hwif); |
| 911 | plug_device = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | } |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 913 | irq_ret = IRQ_HANDLED; |
| 914 | out: |
Bartlomiej Zolnierkiewicz | b65fac3 | 2009-01-06 17:20:50 +0100 | [diff] [blame] | 915 | spin_unlock_irqrestore(&hwif->lock, flags); |
Bartlomiej Zolnierkiewicz | ae86afa | 2009-01-06 17:20:48 +0100 | [diff] [blame] | 916 | out_early: |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 917 | if (plug_device) { |
| 918 | ide_unlock_host(hwif->host); |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 919 | ide_plug_device(drive); |
Bartlomiej Zolnierkiewicz | 5b31f85 | 2009-01-06 17:20:49 +0100 | [diff] [blame] | 920 | } |
Bartlomiej Zolnierkiewicz | 201bffa | 2009-01-02 16:12:50 +0100 | [diff] [blame] | 921 | |
Bartlomiej Zolnierkiewicz | 3e0e29f | 2008-12-29 20:27:29 +0100 | [diff] [blame] | 922 | return irq_ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } |
Stanislaw Gruszka | 849d713 | 2009-03-05 16:10:57 +0100 | [diff] [blame] | 924 | EXPORT_SYMBOL_GPL(ide_intr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 926 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
| 927 | { |
| 928 | ide_hwif_t *hwif = drive->hwif; |
| 929 | u8 buf[4] = { 0 }; |
| 930 | |
| 931 | while (len > 0) { |
| 932 | if (write) |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 933 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 934 | else |
Bartlomiej Zolnierkiewicz | 374e042 | 2008-07-23 19:55:56 +0200 | [diff] [blame] | 935 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
Bartlomiej Zolnierkiewicz | 9f87abe | 2008-04-28 23:44:41 +0200 | [diff] [blame] | 936 | len -= 4; |
| 937 | } |
| 938 | } |
| 939 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |