Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Pierre Ossman | 70f1048 | 2007-07-11 20:04:50 +0200 | [diff] [blame] | 2 | * linux/drivers/mmc/card/queue.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2003 Russell King, All Rights Reserved. |
Pierre Ossman | 98ac216 | 2006-12-23 20:03:02 +0100 | [diff] [blame] | 5 | * Copyright 2006-2007 Pierre Ossman |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/blkdev.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 14 | #include <linux/freezer.h> |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 15 | #include <linux/kthread.h> |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 16 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include <linux/mmc/card.h> |
| 19 | #include <linux/mmc/host.h> |
Pierre Ossman | 98ac216 | 2006-12-23 20:03:02 +0100 | [diff] [blame] | 20 | #include "queue.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 22 | #define MMC_QUEUE_BOUNCESZ 65536 |
| 23 | |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 24 | #define MMC_QUEUE_SUSPENDED (1 << 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | /* |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 27 | * Prepare a MMC request. This just filters out odd stuff. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | */ |
| 29 | static int mmc_prep_request(struct request_queue *q, struct request *req) |
| 30 | { |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 31 | /* |
| 32 | * We only like normal block requests. |
| 33 | */ |
| 34 | if (!blk_fs_request(req) && !blk_pc_request(req)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | blk_dump_rq_flags(req, "MMC bad request"); |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 36 | return BLKPREP_KILL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | } |
| 38 | |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 39 | req->cmd_flags |= REQ_DONTPREP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 41 | return BLKPREP_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | static int mmc_queue_thread(void *d) |
| 45 | { |
| 46 | struct mmc_queue *mq = d; |
| 47 | struct request_queue *q = mq->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 49 | current->flags |= PF_MEMALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | down(&mq->thread_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | do { |
| 53 | struct request *req = NULL; |
| 54 | |
| 55 | spin_lock_irq(q->queue_lock); |
| 56 | set_current_state(TASK_INTERRUPTIBLE); |
| 57 | if (!blk_queue_plugged(q)) |
Juha [êölä | c723e08a | 2006-08-06 09:58:22 +0100 | [diff] [blame] | 58 | req = elv_next_request(q); |
| 59 | mq->req = req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | spin_unlock_irq(q->queue_lock); |
| 61 | |
| 62 | if (!req) { |
Vitaly Wool | 7b30d28 | 2006-12-07 20:08:02 +0100 | [diff] [blame] | 63 | if (kthread_should_stop()) { |
| 64 | set_current_state(TASK_RUNNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | break; |
Vitaly Wool | 7b30d28 | 2006-12-07 20:08:02 +0100 | [diff] [blame] | 66 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | up(&mq->thread_sem); |
| 68 | schedule(); |
| 69 | down(&mq->thread_sem); |
| 70 | continue; |
| 71 | } |
| 72 | set_current_state(TASK_RUNNING); |
| 73 | |
| 74 | mq->issue_fn(mq, req); |
| 75 | } while (1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | up(&mq->thread_sem); |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Generic MMC request handler. This is called for any queue on a |
| 83 | * particular host. When the host is not busy, we look for a request |
| 84 | * on any queue on this host, and attempt to issue it. This may |
| 85 | * not be the queue we were asked to process. |
| 86 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 87 | static void mmc_request(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
| 89 | struct mmc_queue *mq = q->queuedata; |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 90 | struct request *req; |
| 91 | int ret; |
| 92 | |
| 93 | if (!mq) { |
| 94 | printk(KERN_ERR "MMC: killing requests for dead queue\n"); |
| 95 | while ((req = elv_next_request(q)) != NULL) { |
| 96 | do { |
Kiyoshi Ueda | fd53983 | 2007-12-11 17:48:29 -0500 | [diff] [blame] | 97 | ret = __blk_end_request(req, -EIO, |
| 98 | blk_rq_cur_bytes(req)); |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 99 | } while (ret); |
| 100 | } |
| 101 | return; |
| 102 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | if (!mq->req) |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 105 | wake_up_process(mq->thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | /** |
| 109 | * mmc_init_queue - initialise a queue structure. |
| 110 | * @mq: mmc queue |
| 111 | * @card: mmc card to attach this queue |
| 112 | * @lock: queue lock |
| 113 | * |
| 114 | * Initialise a MMC card request queue. |
| 115 | */ |
| 116 | int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock) |
| 117 | { |
| 118 | struct mmc_host *host = card->host; |
| 119 | u64 limit = BLK_BOUNCE_HIGH; |
| 120 | int ret; |
| 121 | |
Greg Kroah-Hartman | fcaf71f | 2006-09-12 17:00:10 +0200 | [diff] [blame] | 122 | if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask) |
| 123 | limit = *mmc_dev(host)->dma_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | mq->card = card; |
| 126 | mq->queue = blk_init_queue(mmc_request, lock); |
| 127 | if (!mq->queue) |
| 128 | return -ENOMEM; |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | mq->queue->queuedata = mq; |
| 131 | mq->req = NULL; |
| 132 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 133 | blk_queue_prep_rq(mq->queue, mmc_prep_request); |
| 134 | |
| 135 | #ifdef CONFIG_MMC_BLOCK_BOUNCE |
| 136 | if (host->max_hw_segs == 1) { |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 137 | unsigned int bouncesz; |
| 138 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 139 | bouncesz = MMC_QUEUE_BOUNCESZ; |
| 140 | |
| 141 | if (bouncesz > host->max_req_size) |
| 142 | bouncesz = host->max_req_size; |
| 143 | if (bouncesz > host->max_seg_size) |
| 144 | bouncesz = host->max_seg_size; |
| 145 | |
| 146 | mq->bounce_buf = kmalloc(bouncesz, GFP_KERNEL); |
| 147 | if (!mq->bounce_buf) { |
| 148 | printk(KERN_WARNING "%s: unable to allocate " |
| 149 | "bounce buffer\n", mmc_card_name(card)); |
| 150 | } else { |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 151 | blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 152 | blk_queue_max_sectors(mq->queue, bouncesz / 512); |
| 153 | blk_queue_max_phys_segments(mq->queue, bouncesz / 512); |
| 154 | blk_queue_max_hw_segments(mq->queue, bouncesz / 512); |
| 155 | blk_queue_max_segment_size(mq->queue, bouncesz); |
| 156 | |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 157 | mq->sg = kmalloc(sizeof(struct scatterlist), |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 158 | GFP_KERNEL); |
| 159 | if (!mq->sg) { |
| 160 | ret = -ENOMEM; |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 161 | goto cleanup_queue; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 162 | } |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 163 | sg_init_table(mq->sg, 1); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 164 | |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 165 | mq->bounce_sg = kmalloc(sizeof(struct scatterlist) * |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 166 | bouncesz / 512, GFP_KERNEL); |
| 167 | if (!mq->bounce_sg) { |
| 168 | ret = -ENOMEM; |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 169 | goto cleanup_queue; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 170 | } |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 171 | sg_init_table(mq->bounce_sg, bouncesz / 512); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 172 | } |
| 173 | } |
| 174 | #endif |
| 175 | |
| 176 | if (!mq->bounce_buf) { |
| 177 | blk_queue_bounce_limit(mq->queue, limit); |
| 178 | blk_queue_max_sectors(mq->queue, host->max_req_size / 512); |
| 179 | blk_queue_max_phys_segments(mq->queue, host->max_phys_segs); |
| 180 | blk_queue_max_hw_segments(mq->queue, host->max_hw_segs); |
| 181 | blk_queue_max_segment_size(mq->queue, host->max_seg_size); |
| 182 | |
Haavard Skinnemoen | 05e5b13 | 2007-11-23 10:19:00 +0100 | [diff] [blame] | 183 | mq->sg = kmalloc(sizeof(struct scatterlist) * |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 184 | host->max_phys_segs, GFP_KERNEL); |
| 185 | if (!mq->sg) { |
| 186 | ret = -ENOMEM; |
| 187 | goto cleanup_queue; |
| 188 | } |
Haavard Skinnemoen | 05e5b13 | 2007-11-23 10:19:00 +0100 | [diff] [blame] | 189 | sg_init_table(mq->sg, host->max_phys_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | init_MUTEX(&mq->thread_sem); |
| 193 | |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 194 | mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd"); |
| 195 | if (IS_ERR(mq->thread)) { |
| 196 | ret = PTR_ERR(mq->thread); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 197 | goto free_bounce_sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 200 | return 0; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 201 | free_bounce_sg: |
| 202 | if (mq->bounce_sg) |
| 203 | kfree(mq->bounce_sg); |
| 204 | mq->bounce_sg = NULL; |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 205 | cleanup_queue: |
| 206 | if (mq->sg) |
| 207 | kfree(mq->sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | mq->sg = NULL; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 209 | if (mq->bounce_buf) |
| 210 | kfree(mq->bounce_buf); |
| 211 | mq->bounce_buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | blk_cleanup_queue(mq->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | return ret; |
| 214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | void mmc_cleanup_queue(struct mmc_queue *mq) |
| 217 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 218 | struct request_queue *q = mq->queue; |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 219 | unsigned long flags; |
| 220 | |
| 221 | /* Mark that we should start throwing out stragglers */ |
| 222 | spin_lock_irqsave(q->queue_lock, flags); |
| 223 | q->queuedata = NULL; |
| 224 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 225 | |
Pierre Ossman | d2b46f6 | 2007-04-28 16:52:12 +0200 | [diff] [blame] | 226 | /* Make sure the queue isn't suspended, as that will deadlock */ |
| 227 | mmc_queue_resume(mq); |
| 228 | |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 229 | /* Then terminate our worker thread */ |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 230 | kthread_stop(mq->thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 232 | if (mq->bounce_sg) |
| 233 | kfree(mq->bounce_sg); |
| 234 | mq->bounce_sg = NULL; |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | kfree(mq->sg); |
| 237 | mq->sg = NULL; |
| 238 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 239 | if (mq->bounce_buf) |
| 240 | kfree(mq->bounce_buf); |
| 241 | mq->bounce_buf = NULL; |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | blk_cleanup_queue(mq->queue); |
| 244 | |
| 245 | mq->card = NULL; |
| 246 | } |
| 247 | EXPORT_SYMBOL(mmc_cleanup_queue); |
| 248 | |
| 249 | /** |
| 250 | * mmc_queue_suspend - suspend a MMC request queue |
| 251 | * @mq: MMC queue to suspend |
| 252 | * |
| 253 | * Stop the block request queue, and wait for our thread to |
| 254 | * complete any outstanding requests. This ensures that we |
| 255 | * won't suspend while a request is being processed. |
| 256 | */ |
| 257 | void mmc_queue_suspend(struct mmc_queue *mq) |
| 258 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 259 | struct request_queue *q = mq->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | unsigned long flags; |
| 261 | |
| 262 | if (!(mq->flags & MMC_QUEUE_SUSPENDED)) { |
| 263 | mq->flags |= MMC_QUEUE_SUSPENDED; |
| 264 | |
| 265 | spin_lock_irqsave(q->queue_lock, flags); |
| 266 | blk_stop_queue(q); |
| 267 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 268 | |
| 269 | down(&mq->thread_sem); |
| 270 | } |
| 271 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /** |
| 274 | * mmc_queue_resume - resume a previously suspended MMC request queue |
| 275 | * @mq: MMC queue to resume |
| 276 | */ |
| 277 | void mmc_queue_resume(struct mmc_queue *mq) |
| 278 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 279 | struct request_queue *q = mq->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | unsigned long flags; |
| 281 | |
| 282 | if (mq->flags & MMC_QUEUE_SUSPENDED) { |
| 283 | mq->flags &= ~MMC_QUEUE_SUSPENDED; |
| 284 | |
| 285 | up(&mq->thread_sem); |
| 286 | |
| 287 | spin_lock_irqsave(q->queue_lock, flags); |
| 288 | blk_start_queue(q); |
| 289 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 290 | } |
| 291 | } |
Pierre Ossman | 98ac216 | 2006-12-23 20:03:02 +0100 | [diff] [blame] | 292 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 293 | /* |
| 294 | * Prepare the sg list(s) to be handed of to the host driver |
| 295 | */ |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 296 | unsigned int mmc_queue_map_sg(struct mmc_queue *mq) |
| 297 | { |
| 298 | unsigned int sg_len; |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 299 | size_t buflen; |
| 300 | struct scatterlist *sg; |
| 301 | int i; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 302 | |
| 303 | if (!mq->bounce_buf) |
| 304 | return blk_rq_map_sg(mq->queue, mq->req, mq->sg); |
| 305 | |
| 306 | BUG_ON(!mq->bounce_sg); |
| 307 | |
| 308 | sg_len = blk_rq_map_sg(mq->queue, mq->req, mq->bounce_sg); |
| 309 | |
| 310 | mq->bounce_sg_len = sg_len; |
| 311 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 312 | buflen = 0; |
| 313 | for_each_sg(mq->bounce_sg, sg, sg_len, i) |
| 314 | buflen += sg->length; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 315 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 316 | sg_init_one(mq->sg, mq->bounce_buf, buflen); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 317 | |
| 318 | return 1; |
| 319 | } |
| 320 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 321 | /* |
| 322 | * If writing, bounce the data to the buffer before the request |
| 323 | * is sent to the host driver |
| 324 | */ |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 325 | void mmc_queue_bounce_pre(struct mmc_queue *mq) |
| 326 | { |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 327 | unsigned long flags; |
| 328 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 329 | if (!mq->bounce_buf) |
| 330 | return; |
| 331 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 332 | if (rq_data_dir(mq->req) != WRITE) |
| 333 | return; |
| 334 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 335 | local_irq_save(flags); |
| 336 | sg_copy_to_buffer(mq->bounce_sg, mq->bounce_sg_len, |
| 337 | mq->bounce_buf, mq->sg[0].length); |
| 338 | local_irq_restore(flags); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 339 | } |
| 340 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 341 | /* |
| 342 | * If reading, bounce the data from the buffer after the request |
| 343 | * has been handled by the host driver |
| 344 | */ |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 345 | void mmc_queue_bounce_post(struct mmc_queue *mq) |
| 346 | { |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 347 | unsigned long flags; |
| 348 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 349 | if (!mq->bounce_buf) |
| 350 | return; |
| 351 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 352 | if (rq_data_dir(mq->req) != READ) |
| 353 | return; |
| 354 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 355 | local_irq_save(flags); |
| 356 | sg_copy_from_buffer(mq->bounce_sg, mq->bounce_sg_len, |
| 357 | mq->bounce_buf, mq->sg[0].length); |
| 358 | local_irq_restore(flags); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 359 | } |
| 360 | |