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 | */ |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/blkdev.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 15 | #include <linux/freezer.h> |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 16 | #include <linux/kthread.h> |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 17 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include <linux/mmc/card.h> |
| 20 | #include <linux/mmc/host.h> |
Pierre Ossman | 98ac216 | 2006-12-23 20:03:02 +0100 | [diff] [blame] | 21 | #include "queue.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 23 | #define MMC_QUEUE_BOUNCESZ 65536 |
| 24 | |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 25 | #define MMC_QUEUE_SUSPENDED (1 << 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | /* |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 28 | * Prepare a MMC request. This just filters out odd stuff. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | */ |
| 30 | static int mmc_prep_request(struct request_queue *q, struct request *req) |
| 31 | { |
Sujit Reddy Thumma | a8ad82cc | 2011-12-08 14:05:50 +0530 | [diff] [blame] | 32 | struct mmc_queue *mq = q->queuedata; |
| 33 | |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 34 | /* |
Adrian Hunter | bd788c9 | 2010-08-11 14:17:47 -0700 | [diff] [blame] | 35 | * We only like normal block requests and discards. |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 36 | */ |
Adrian Hunter | bd788c9 | 2010-08-11 14:17:47 -0700 | [diff] [blame] | 37 | if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | blk_dump_rq_flags(req, "MMC bad request"); |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 39 | return BLKPREP_KILL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | } |
| 41 | |
Sujit Reddy Thumma | a8ad82cc | 2011-12-08 14:05:50 +0530 | [diff] [blame] | 42 | if (mq && mmc_card_removed(mq->card)) |
| 43 | return BLKPREP_KILL; |
| 44 | |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 45 | req->cmd_flags |= REQ_DONTPREP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Pierre Ossman | 9c9f2d6 | 2007-05-16 17:29:21 +0200 | [diff] [blame] | 47 | return BLKPREP_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | static int mmc_queue_thread(void *d) |
| 51 | { |
| 52 | struct mmc_queue *mq = d; |
| 53 | struct request_queue *q = mq->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 55 | current->flags |= PF_MEMALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | down(&mq->thread_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | do { |
| 59 | struct request *req = NULL; |
Per Forlin | ee8a43a | 2011-07-01 18:55:33 +0200 | [diff] [blame] | 60 | struct mmc_queue_req *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | spin_lock_irq(q->queue_lock); |
| 63 | set_current_state(TASK_INTERRUPTIBLE); |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 64 | req = blk_fetch_request(q); |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 65 | mq->mqrq_cur->req = req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | spin_unlock_irq(q->queue_lock); |
| 67 | |
Per Forlin | ee8a43a | 2011-07-01 18:55:33 +0200 | [diff] [blame] | 68 | if (req || mq->mqrq_prev->req) { |
| 69 | set_current_state(TASK_RUNNING); |
| 70 | mq->issue_fn(mq, req); |
| 71 | } else { |
Vitaly Wool | 7b30d28 | 2006-12-07 20:08:02 +0100 | [diff] [blame] | 72 | if (kthread_should_stop()) { |
| 73 | set_current_state(TASK_RUNNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | break; |
Vitaly Wool | 7b30d28 | 2006-12-07 20:08:02 +0100 | [diff] [blame] | 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | up(&mq->thread_sem); |
| 77 | schedule(); |
| 78 | down(&mq->thread_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Per Forlin | ee8a43a | 2011-07-01 18:55:33 +0200 | [diff] [blame] | 81 | /* Current request becomes previous request and vice versa. */ |
| 82 | mq->mqrq_prev->brq.mrq.data = NULL; |
| 83 | mq->mqrq_prev->req = NULL; |
| 84 | tmp = mq->mqrq_prev; |
| 85 | mq->mqrq_prev = mq->mqrq_cur; |
| 86 | mq->mqrq_cur = tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } while (1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | up(&mq->thread_sem); |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Generic MMC request handler. This is called for any queue on a |
| 95 | * particular host. When the host is not busy, we look for a request |
| 96 | * on any queue on this host, and attempt to issue it. This may |
| 97 | * not be the queue we were asked to process. |
| 98 | */ |
Venkatraman S | 1b50f5f | 2012-04-13 17:54:11 +0530 | [diff] [blame] | 99 | static void mmc_request_fn(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
| 101 | struct mmc_queue *mq = q->queuedata; |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 102 | struct request *req; |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 103 | |
| 104 | if (!mq) { |
Adrian Hunter | 5fa83ce | 2010-01-08 14:43:00 -0800 | [diff] [blame] | 105 | while ((req = blk_fetch_request(q)) != NULL) { |
| 106 | req->cmd_flags |= REQ_QUIET; |
Tejun Heo | 296b2f6 | 2009-05-08 11:54:15 +0900 | [diff] [blame] | 107 | __blk_end_request_all(req, -EIO); |
Adrian Hunter | 5fa83ce | 2010-01-08 14:43:00 -0800 | [diff] [blame] | 108 | } |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 109 | return; |
| 110 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Per Forlin | ee8a43a | 2011-07-01 18:55:33 +0200 | [diff] [blame] | 112 | if (!mq->mqrq_cur->req && !mq->mqrq_prev->req) |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 113 | wake_up_process(mq->thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
Venkatraman S | 7513cd7 | 2011-08-23 21:16:02 +0530 | [diff] [blame] | 116 | static struct scatterlist *mmc_alloc_sg(int sg_len, int *err) |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 117 | { |
| 118 | struct scatterlist *sg; |
| 119 | |
| 120 | sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL); |
| 121 | if (!sg) |
| 122 | *err = -ENOMEM; |
| 123 | else { |
| 124 | *err = 0; |
| 125 | sg_init_table(sg, sg_len); |
| 126 | } |
| 127 | |
| 128 | return sg; |
| 129 | } |
| 130 | |
Adrian Hunter | e056a1b | 2011-06-28 17:16:02 +0300 | [diff] [blame] | 131 | static void mmc_queue_setup_discard(struct request_queue *q, |
| 132 | struct mmc_card *card) |
| 133 | { |
| 134 | unsigned max_discard; |
| 135 | |
| 136 | max_discard = mmc_calc_max_discard(card); |
| 137 | if (!max_discard) |
| 138 | return; |
| 139 | |
| 140 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
| 141 | q->limits.max_discard_sectors = max_discard; |
Adrian Hunter | 7194efb | 2012-04-05 14:45:47 +0300 | [diff] [blame] | 142 | if (card->erased_byte == 0 && !mmc_can_discard(card)) |
Adrian Hunter | e056a1b | 2011-06-28 17:16:02 +0300 | [diff] [blame] | 143 | q->limits.discard_zeroes_data = 1; |
| 144 | q->limits.discard_granularity = card->pref_erase << 9; |
| 145 | /* granularity must not be greater than max. discard */ |
| 146 | if (card->pref_erase > max_discard) |
| 147 | q->limits.discard_granularity = 0; |
Kyungmin Park | d9ddd62 | 2011-10-14 14:15:48 +0900 | [diff] [blame] | 148 | if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card)) |
Adrian Hunter | e056a1b | 2011-06-28 17:16:02 +0300 | [diff] [blame] | 149 | queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q); |
| 150 | } |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /** |
| 153 | * mmc_init_queue - initialise a queue structure. |
| 154 | * @mq: mmc queue |
| 155 | * @card: mmc card to attach this queue |
| 156 | * @lock: queue lock |
Adrian Hunter | d09408a | 2011-06-23 13:40:28 +0300 | [diff] [blame] | 157 | * @subname: partition subname |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | * |
| 159 | * Initialise a MMC card request queue. |
| 160 | */ |
Adrian Hunter | d09408a | 2011-06-23 13:40:28 +0300 | [diff] [blame] | 161 | int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, |
| 162 | spinlock_t *lock, const char *subname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | { |
| 164 | struct mmc_host *host = card->host; |
| 165 | u64 limit = BLK_BOUNCE_HIGH; |
| 166 | int ret; |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 167 | struct mmc_queue_req *mqrq_cur = &mq->mqrq[0]; |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 168 | struct mmc_queue_req *mqrq_prev = &mq->mqrq[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Greg Kroah-Hartman | fcaf71f | 2006-09-12 17:00:10 +0200 | [diff] [blame] | 170 | if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask) |
| 171 | limit = *mmc_dev(host)->dma_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | mq->card = card; |
Venkatraman S | 1b50f5f | 2012-04-13 17:54:11 +0530 | [diff] [blame] | 174 | mq->queue = blk_init_queue(mmc_request_fn, lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | if (!mq->queue) |
| 176 | return -ENOMEM; |
| 177 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 178 | mq->mqrq_cur = mqrq_cur; |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 179 | mq->mqrq_prev = mqrq_prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | mq->queue->queuedata = mq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 182 | blk_queue_prep_rq(mq->queue, mmc_prep_request); |
Pierre Ossman | 8dddfe1 | 2008-10-14 20:04:46 +0200 | [diff] [blame] | 183 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue); |
Adrian Hunter | e056a1b | 2011-06-28 17:16:02 +0300 | [diff] [blame] | 184 | if (mmc_can_erase(card)) |
| 185 | mmc_queue_setup_discard(mq->queue, card); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 186 | |
| 187 | #ifdef CONFIG_MMC_BLOCK_BOUNCE |
Martin K. Petersen | a36274e | 2010-09-10 01:33:59 -0400 | [diff] [blame] | 188 | if (host->max_segs == 1) { |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 189 | unsigned int bouncesz; |
| 190 | |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 191 | bouncesz = MMC_QUEUE_BOUNCESZ; |
| 192 | |
| 193 | if (bouncesz > host->max_req_size) |
| 194 | bouncesz = host->max_req_size; |
| 195 | if (bouncesz > host->max_seg_size) |
| 196 | bouncesz = host->max_seg_size; |
Pierre Ossman | f3eb0aa | 2008-08-16 21:34:02 +0200 | [diff] [blame] | 197 | if (bouncesz > (host->max_blk_count * 512)) |
| 198 | bouncesz = host->max_blk_count * 512; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 199 | |
Pierre Ossman | f3eb0aa | 2008-08-16 21:34:02 +0200 | [diff] [blame] | 200 | if (bouncesz > 512) { |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 201 | mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL); |
| 202 | if (!mqrq_cur->bounce_buf) { |
Girish K S | a3c76eb | 2011-10-11 11:44:09 +0530 | [diff] [blame] | 203 | pr_warning("%s: unable to " |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 204 | "allocate bounce cur buffer\n", |
Pierre Ossman | f3eb0aa | 2008-08-16 21:34:02 +0200 | [diff] [blame] | 205 | mmc_card_name(card)); |
| 206 | } |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 207 | mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL); |
| 208 | if (!mqrq_prev->bounce_buf) { |
Girish K S | a3c76eb | 2011-10-11 11:44:09 +0530 | [diff] [blame] | 209 | pr_warning("%s: unable to " |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 210 | "allocate bounce prev buffer\n", |
| 211 | mmc_card_name(card)); |
| 212 | kfree(mqrq_cur->bounce_buf); |
| 213 | mqrq_cur->bounce_buf = NULL; |
| 214 | } |
Pierre Ossman | f3eb0aa | 2008-08-16 21:34:02 +0200 | [diff] [blame] | 215 | } |
| 216 | |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 217 | if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) { |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 218 | blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY); |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 219 | blk_queue_max_hw_sectors(mq->queue, bouncesz / 512); |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 220 | blk_queue_max_segments(mq->queue, bouncesz / 512); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 221 | blk_queue_max_segment_size(mq->queue, bouncesz); |
| 222 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 223 | mqrq_cur->sg = mmc_alloc_sg(1, &ret); |
| 224 | if (ret) |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 225 | goto cleanup_queue; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 226 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 227 | mqrq_cur->bounce_sg = |
| 228 | mmc_alloc_sg(bouncesz / 512, &ret); |
| 229 | if (ret) |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 230 | goto cleanup_queue; |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 231 | |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 232 | mqrq_prev->sg = mmc_alloc_sg(1, &ret); |
| 233 | if (ret) |
| 234 | goto cleanup_queue; |
| 235 | |
| 236 | mqrq_prev->bounce_sg = |
| 237 | mmc_alloc_sg(bouncesz / 512, &ret); |
| 238 | if (ret) |
| 239 | goto cleanup_queue; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 240 | } |
| 241 | } |
| 242 | #endif |
| 243 | |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 244 | if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) { |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 245 | blk_queue_bounce_limit(mq->queue, limit); |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 246 | blk_queue_max_hw_sectors(mq->queue, |
Pierre Ossman | f3eb0aa | 2008-08-16 21:34:02 +0200 | [diff] [blame] | 247 | min(host->max_blk_count, host->max_req_size / 512)); |
Martin K. Petersen | a36274e | 2010-09-10 01:33:59 -0400 | [diff] [blame] | 248 | blk_queue_max_segments(mq->queue, host->max_segs); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 249 | blk_queue_max_segment_size(mq->queue, host->max_seg_size); |
| 250 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 251 | mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret); |
| 252 | if (ret) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 253 | goto cleanup_queue; |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 254 | |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 255 | |
| 256 | mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret); |
| 257 | if (ret) |
| 258 | goto cleanup_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
| 260 | |
Thomas Gleixner | 632cf92 | 2010-09-14 07:12:35 -0400 | [diff] [blame] | 261 | sema_init(&mq->thread_sem, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Adrian Hunter | d09408a | 2011-06-23 13:40:28 +0300 | [diff] [blame] | 263 | mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s", |
| 264 | host->index, subname ? subname : ""); |
Ethan Du | de528fa | 2010-09-30 18:40:27 -0400 | [diff] [blame] | 265 | |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 266 | if (IS_ERR(mq->thread)) { |
| 267 | ret = PTR_ERR(mq->thread); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 268 | goto free_bounce_sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 271 | return 0; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 272 | free_bounce_sg: |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 273 | kfree(mqrq_cur->bounce_sg); |
| 274 | mqrq_cur->bounce_sg = NULL; |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 275 | kfree(mqrq_prev->bounce_sg); |
| 276 | mqrq_prev->bounce_sg = NULL; |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 277 | |
Pierre Ossman | aafabfa | 2007-08-09 14:28:02 +0200 | [diff] [blame] | 278 | cleanup_queue: |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 279 | kfree(mqrq_cur->sg); |
| 280 | mqrq_cur->sg = NULL; |
| 281 | kfree(mqrq_cur->bounce_buf); |
| 282 | mqrq_cur->bounce_buf = NULL; |
| 283 | |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 284 | kfree(mqrq_prev->sg); |
| 285 | mqrq_prev->sg = NULL; |
| 286 | kfree(mqrq_prev->bounce_buf); |
| 287 | mqrq_prev->bounce_buf = NULL; |
| 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | blk_cleanup_queue(mq->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return ret; |
| 291 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
| 293 | void mmc_cleanup_queue(struct mmc_queue *mq) |
| 294 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 295 | struct request_queue *q = mq->queue; |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 296 | unsigned long flags; |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 297 | struct mmc_queue_req *mqrq_cur = mq->mqrq_cur; |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 298 | struct mmc_queue_req *mqrq_prev = mq->mqrq_prev; |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 299 | |
Pierre Ossman | d2b46f6 | 2007-04-28 16:52:12 +0200 | [diff] [blame] | 300 | /* Make sure the queue isn't suspended, as that will deadlock */ |
| 301 | mmc_queue_resume(mq); |
| 302 | |
Pierre Ossman | 89b4e13 | 2006-11-14 22:08:16 +0100 | [diff] [blame] | 303 | /* Then terminate our worker thread */ |
Christoph Hellwig | 87598a2 | 2006-11-13 20:23:52 +0100 | [diff] [blame] | 304 | kthread_stop(mq->thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
Adrian Hunter | 5fa83ce | 2010-01-08 14:43:00 -0800 | [diff] [blame] | 306 | /* Empty the queue */ |
| 307 | spin_lock_irqsave(q->queue_lock, flags); |
| 308 | q->queuedata = NULL; |
| 309 | blk_start_queue(q); |
| 310 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 311 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 312 | kfree(mqrq_cur->bounce_sg); |
| 313 | mqrq_cur->bounce_sg = NULL; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 314 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 315 | kfree(mqrq_cur->sg); |
| 316 | mqrq_cur->sg = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 318 | kfree(mqrq_cur->bounce_buf); |
| 319 | mqrq_cur->bounce_buf = NULL; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 320 | |
Per Forlin | 04296b7 | 2011-07-01 18:55:31 +0200 | [diff] [blame] | 321 | kfree(mqrq_prev->bounce_sg); |
| 322 | mqrq_prev->bounce_sg = NULL; |
| 323 | |
| 324 | kfree(mqrq_prev->sg); |
| 325 | mqrq_prev->sg = NULL; |
| 326 | |
| 327 | kfree(mqrq_prev->bounce_buf); |
| 328 | mqrq_prev->bounce_buf = NULL; |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | mq->card = NULL; |
| 331 | } |
| 332 | EXPORT_SYMBOL(mmc_cleanup_queue); |
| 333 | |
| 334 | /** |
| 335 | * mmc_queue_suspend - suspend a MMC request queue |
| 336 | * @mq: MMC queue to suspend |
| 337 | * |
| 338 | * Stop the block request queue, and wait for our thread to |
| 339 | * complete any outstanding requests. This ensures that we |
| 340 | * won't suspend while a request is being processed. |
| 341 | */ |
| 342 | void mmc_queue_suspend(struct mmc_queue *mq) |
| 343 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 344 | struct request_queue *q = mq->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | unsigned long flags; |
| 346 | |
| 347 | if (!(mq->flags & MMC_QUEUE_SUSPENDED)) { |
| 348 | mq->flags |= MMC_QUEUE_SUSPENDED; |
| 349 | |
| 350 | spin_lock_irqsave(q->queue_lock, flags); |
| 351 | blk_stop_queue(q); |
| 352 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 353 | |
| 354 | down(&mq->thread_sem); |
| 355 | } |
| 356 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
| 358 | /** |
| 359 | * mmc_queue_resume - resume a previously suspended MMC request queue |
| 360 | * @mq: MMC queue to resume |
| 361 | */ |
| 362 | void mmc_queue_resume(struct mmc_queue *mq) |
| 363 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 364 | struct request_queue *q = mq->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | unsigned long flags; |
| 366 | |
| 367 | if (mq->flags & MMC_QUEUE_SUSPENDED) { |
| 368 | mq->flags &= ~MMC_QUEUE_SUSPENDED; |
| 369 | |
| 370 | up(&mq->thread_sem); |
| 371 | |
| 372 | spin_lock_irqsave(q->queue_lock, flags); |
| 373 | blk_start_queue(q); |
| 374 | spin_unlock_irqrestore(q->queue_lock, flags); |
| 375 | } |
| 376 | } |
Pierre Ossman | 98ac216 | 2006-12-23 20:03:02 +0100 | [diff] [blame] | 377 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 378 | /* |
| 379 | * Prepare the sg list(s) to be handed of to the host driver |
| 380 | */ |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 381 | unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 382 | { |
| 383 | unsigned int sg_len; |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 384 | size_t buflen; |
| 385 | struct scatterlist *sg; |
| 386 | int i; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 387 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 388 | if (!mqrq->bounce_buf) |
| 389 | return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 390 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 391 | BUG_ON(!mqrq->bounce_sg); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 392 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 393 | sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 394 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 395 | mqrq->bounce_sg_len = sg_len; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 396 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 397 | buflen = 0; |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 398 | for_each_sg(mqrq->bounce_sg, sg, sg_len, i) |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 399 | buflen += sg->length; |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 400 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 401 | sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 402 | |
| 403 | return 1; |
| 404 | } |
| 405 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 406 | /* |
| 407 | * If writing, bounce the data to the buffer before the request |
| 408 | * is sent to the host driver |
| 409 | */ |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 410 | void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 411 | { |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 412 | if (!mqrq->bounce_buf) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 413 | return; |
| 414 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 415 | if (rq_data_dir(mqrq->req) != WRITE) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 416 | return; |
| 417 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 418 | sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len, |
| 419 | mqrq->bounce_buf, mqrq->sg[0].length); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 420 | } |
| 421 | |
Pierre Ossman | 2ff1fa6 | 2008-07-22 14:35:42 +0200 | [diff] [blame] | 422 | /* |
| 423 | * If reading, bounce the data from the buffer after the request |
| 424 | * has been handled by the host driver |
| 425 | */ |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 426 | void mmc_queue_bounce_post(struct mmc_queue_req *mqrq) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 427 | { |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 428 | if (!mqrq->bounce_buf) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 429 | return; |
| 430 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 431 | if (rq_data_dir(mqrq->req) != READ) |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 432 | return; |
| 433 | |
Per Forlin | 97868a2 | 2011-07-09 17:12:36 -0400 | [diff] [blame] | 434 | sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len, |
| 435 | mqrq->bounce_buf, mqrq->sg[0].length); |
Pierre Ossman | 98ccf14 | 2007-05-12 00:26:16 +0200 | [diff] [blame] | 436 | } |