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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Pierre Ossman70f10482007-07-11 20:04:50 +02002 * linux/drivers/mmc/card/queue.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
Pierre Ossman98ac2162006-12-23 20:03:02 +01005 * Copyright 2006-2007 Pierre Ossman
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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 Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/module.h>
14#include <linux/blkdev.h>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070015#include <linux/freezer.h>
Christoph Hellwig87598a22006-11-13 20:23:52 +010016#include <linux/kthread.h>
Jens Axboe45711f12007-10-22 21:19:53 +020017#include <linux/scatterlist.h>
Santosh Shilimkar8e0cb8a2013-07-29 14:20:15 +010018#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20#include <linux/mmc/card.h>
21#include <linux/mmc/host.h>
Pierre Ossman98ac2162006-12-23 20:03:02 +010022#include "queue.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Pierre Ossman98ccf142007-05-12 00:26:16 +020024#define MMC_QUEUE_BOUNCESZ 65536
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026/*
Pierre Ossman9c9f2d62007-05-16 17:29:21 +020027 * Prepare a MMC request. This just filters out odd stuff.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 */
29static int mmc_prep_request(struct request_queue *q, struct request *req)
30{
Sujit Reddy Thummaa8ad82cc2011-12-08 14:05:50 +053031 struct mmc_queue *mq = q->queuedata;
32
Pierre Ossman9c9f2d62007-05-16 17:29:21 +020033 /*
Adrian Hunterbd788c92010-08-11 14:17:47 -070034 * We only like normal block requests and discards.
Pierre Ossman9c9f2d62007-05-16 17:29:21 +020035 */
Adrian Hunterbd788c92010-08-11 14:17:47 -070036 if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 blk_dump_rq_flags(req, "MMC bad request");
Pierre Ossman9c9f2d62007-05-16 17:29:21 +020038 return BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 }
40
Chuanxiao Dong4e93b9a2014-08-12 12:01:30 +080041 if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
Sujit Reddy Thummaa8ad82cc2011-12-08 14:05:50 +053042 return BLKPREP_KILL;
43
Pierre Ossman9c9f2d62007-05-16 17:29:21 +020044 req->cmd_flags |= REQ_DONTPREP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Pierre Ossman9c9f2d62007-05-16 17:29:21 +020046 return BLKPREP_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047}
48
49static int mmc_queue_thread(void *d)
50{
51 struct mmc_queue *mq = d;
52 struct request_queue *q = mq->queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Rafael J. Wysocki83144182007-07-17 04:03:35 -070054 current->flags |= PF_MEMALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 down(&mq->thread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 do {
58 struct request *req = NULL;
Per Forlinee8a43a2011-07-01 18:55:33 +020059 struct mmc_queue_req *tmp;
Seungwon Jeon369d3212012-12-26 10:40:17 +090060 unsigned int cmd_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 spin_lock_irq(q->queue_lock);
63 set_current_state(TASK_INTERRUPTIBLE);
Jens Axboe7eaceac2011-03-10 08:52:07 +010064 req = blk_fetch_request(q);
Per Forlin97868a22011-07-09 17:12:36 -040065 mq->mqrq_cur->req = req;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 spin_unlock_irq(q->queue_lock);
67
Per Forlinee8a43a2011-07-01 18:55:33 +020068 if (req || mq->mqrq_prev->req) {
69 set_current_state(TASK_RUNNING);
Seungwon Jeon369d3212012-12-26 10:40:17 +090070 cmd_flags = req ? req->cmd_flags : 0;
Per Forlinee8a43a2011-07-01 18:55:33 +020071 mq->issue_fn(mq, req);
Konstantin Dorfman2220eed2013-01-14 14:28:17 -050072 if (mq->flags & MMC_QUEUE_NEW_REQUEST) {
73 mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
74 continue; /* fetch again */
75 }
Seungwon Jeon45c5a912012-09-28 19:12:53 +090076
77 /*
78 * Current request becomes previous request
79 * and vice versa.
Seungwon Jeon369d3212012-12-26 10:40:17 +090080 * In case of special requests, current request
81 * has been finished. Do not assign it to previous
82 * request.
Seungwon Jeon45c5a912012-09-28 19:12:53 +090083 */
Seungwon Jeon369d3212012-12-26 10:40:17 +090084 if (cmd_flags & MMC_REQ_SPECIAL_MASK)
85 mq->mqrq_cur->req = NULL;
86
Seungwon Jeon45c5a912012-09-28 19:12:53 +090087 mq->mqrq_prev->brq.mrq.data = NULL;
88 mq->mqrq_prev->req = NULL;
89 tmp = mq->mqrq_prev;
90 mq->mqrq_prev = mq->mqrq_cur;
91 mq->mqrq_cur = tmp;
Per Forlinee8a43a2011-07-01 18:55:33 +020092 } else {
Vitaly Wool7b30d282006-12-07 20:08:02 +010093 if (kthread_should_stop()) {
94 set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 break;
Vitaly Wool7b30d282006-12-07 20:08:02 +010096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 up(&mq->thread_sem);
98 schedule();
99 down(&mq->thread_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 } while (1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 up(&mq->thread_sem);
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return 0;
105}
106
107/*
108 * Generic MMC request handler. This is called for any queue on a
109 * particular host. When the host is not busy, we look for a request
110 * on any queue on this host, and attempt to issue it. This may
111 * not be the queue we were asked to process.
112 */
Venkatraman S1b50f5f2012-04-13 17:54:11 +0530113static void mmc_request_fn(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
115 struct mmc_queue *mq = q->queuedata;
Pierre Ossman89b4e132006-11-14 22:08:16 +0100116 struct request *req;
Konstantin Dorfman2220eed2013-01-14 14:28:17 -0500117 unsigned long flags;
118 struct mmc_context_info *cntx;
Pierre Ossman89b4e132006-11-14 22:08:16 +0100119
120 if (!mq) {
Adrian Hunter5fa83ce2010-01-08 14:43:00 -0800121 while ((req = blk_fetch_request(q)) != NULL) {
122 req->cmd_flags |= REQ_QUIET;
Tejun Heo296b2f62009-05-08 11:54:15 +0900123 __blk_end_request_all(req, -EIO);
Adrian Hunter5fa83ce2010-01-08 14:43:00 -0800124 }
Pierre Ossman89b4e132006-11-14 22:08:16 +0100125 return;
126 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Konstantin Dorfman2220eed2013-01-14 14:28:17 -0500128 cntx = &mq->card->host->context_info;
129 if (!mq->mqrq_cur->req && mq->mqrq_prev->req) {
130 /*
131 * New MMC request arrived when MMC thread may be
132 * blocked on the previous request to be complete
133 * with no current request fetched
134 */
135 spin_lock_irqsave(&cntx->lock, flags);
136 if (cntx->is_waiting_last_req) {
137 cntx->is_new_req = true;
138 wake_up_interruptible(&cntx->wait);
139 }
140 spin_unlock_irqrestore(&cntx->lock, flags);
141 } else if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
Christoph Hellwig87598a22006-11-13 20:23:52 +0100142 wake_up_process(mq->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143}
144
Venkatraman S7513cd72011-08-23 21:16:02 +0530145static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
Per Forlin97868a22011-07-09 17:12:36 -0400146{
147 struct scatterlist *sg;
148
149 sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
150 if (!sg)
151 *err = -ENOMEM;
152 else {
153 *err = 0;
154 sg_init_table(sg, sg_len);
155 }
156
157 return sg;
158}
159
Adrian Huntere056a1b2011-06-28 17:16:02 +0300160static void mmc_queue_setup_discard(struct request_queue *q,
161 struct mmc_card *card)
162{
163 unsigned max_discard;
164
165 max_discard = mmc_calc_max_discard(card);
166 if (!max_discard)
167 return;
168
169 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
170 q->limits.max_discard_sectors = max_discard;
Adrian Hunter7194efb2012-04-05 14:45:47 +0300171 if (card->erased_byte == 0 && !mmc_can_discard(card))
Adrian Huntere056a1b2011-06-28 17:16:02 +0300172 q->limits.discard_zeroes_data = 1;
173 q->limits.discard_granularity = card->pref_erase << 9;
174 /* granularity must not be greater than max. discard */
175 if (card->pref_erase > max_discard)
176 q->limits.discard_granularity = 0;
Maya Erez775a9362013-04-18 15:41:55 +0300177 if (mmc_can_secure_erase_trim(card))
Adrian Huntere056a1b2011-06-28 17:16:02 +0300178 queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
179}
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/**
182 * mmc_init_queue - initialise a queue structure.
183 * @mq: mmc queue
184 * @card: mmc card to attach this queue
185 * @lock: queue lock
Adrian Hunterd09408a2011-06-23 13:40:28 +0300186 * @subname: partition subname
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 *
188 * Initialise a MMC card request queue.
189 */
Adrian Hunterd09408a2011-06-23 13:40:28 +0300190int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
191 spinlock_t *lock, const char *subname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193 struct mmc_host *host = card->host;
194 u64 limit = BLK_BOUNCE_HIGH;
195 int ret;
Per Forlin97868a22011-07-09 17:12:36 -0400196 struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
Per Forlin04296b72011-07-01 18:55:31 +0200197 struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Greg Kroah-Hartmanfcaf71f2006-09-12 17:00:10 +0200199 if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
Russell Kinge83b3662014-02-11 17:11:04 +0000200 limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 mq->card = card;
Venkatraman S1b50f5f2012-04-13 17:54:11 +0530203 mq->queue = blk_init_queue(mmc_request_fn, lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (!mq->queue)
205 return -ENOMEM;
206
Per Forlin97868a22011-07-09 17:12:36 -0400207 mq->mqrq_cur = mqrq_cur;
Per Forlin04296b72011-07-01 18:55:31 +0200208 mq->mqrq_prev = mqrq_prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 mq->queue->queuedata = mq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Pierre Ossman98ccf142007-05-12 00:26:16 +0200211 blk_queue_prep_rq(mq->queue, mmc_prep_request);
Pierre Ossman8dddfe12008-10-14 20:04:46 +0200212 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
Mike Snitzerb277da02014-10-04 10:55:32 -0600213 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
Adrian Huntere056a1b2011-06-28 17:16:02 +0300214 if (mmc_can_erase(card))
215 mmc_queue_setup_discard(mq->queue, card);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200216
217#ifdef CONFIG_MMC_BLOCK_BOUNCE
Martin K. Petersena36274e2010-09-10 01:33:59 -0400218 if (host->max_segs == 1) {
Pierre Ossmanaafabfa2007-08-09 14:28:02 +0200219 unsigned int bouncesz;
220
Pierre Ossman98ccf142007-05-12 00:26:16 +0200221 bouncesz = MMC_QUEUE_BOUNCESZ;
222
223 if (bouncesz > host->max_req_size)
224 bouncesz = host->max_req_size;
225 if (bouncesz > host->max_seg_size)
226 bouncesz = host->max_seg_size;
Pierre Ossmanf3eb0aa2008-08-16 21:34:02 +0200227 if (bouncesz > (host->max_blk_count * 512))
228 bouncesz = host->max_blk_count * 512;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200229
Pierre Ossmanf3eb0aa2008-08-16 21:34:02 +0200230 if (bouncesz > 512) {
Per Forlin97868a22011-07-09 17:12:36 -0400231 mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
232 if (!mqrq_cur->bounce_buf) {
Joe Perches66061102014-09-12 14:56:56 -0700233 pr_warn("%s: unable to allocate bounce cur buffer\n",
Pierre Ossmanf3eb0aa2008-08-16 21:34:02 +0200234 mmc_card_name(card));
Bhuvanesh Suracharifdb409f2014-12-01 02:23:02 -0500235 } else {
236 mqrq_prev->bounce_buf =
237 kmalloc(bouncesz, GFP_KERNEL);
238 if (!mqrq_prev->bounce_buf) {
239 pr_warn("%s: unable to allocate bounce prev buffer\n",
240 mmc_card_name(card));
241 kfree(mqrq_cur->bounce_buf);
242 mqrq_cur->bounce_buf = NULL;
243 }
Per Forlin04296b72011-07-01 18:55:31 +0200244 }
Pierre Ossmanf3eb0aa2008-08-16 21:34:02 +0200245 }
246
Per Forlin04296b72011-07-01 18:55:31 +0200247 if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200248 blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500249 blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
Martin K. Petersen8a783622010-02-26 00:20:39 -0500250 blk_queue_max_segments(mq->queue, bouncesz / 512);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200251 blk_queue_max_segment_size(mq->queue, bouncesz);
252
Per Forlin97868a22011-07-09 17:12:36 -0400253 mqrq_cur->sg = mmc_alloc_sg(1, &ret);
254 if (ret)
Pierre Ossmanaafabfa2007-08-09 14:28:02 +0200255 goto cleanup_queue;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200256
Per Forlin97868a22011-07-09 17:12:36 -0400257 mqrq_cur->bounce_sg =
258 mmc_alloc_sg(bouncesz / 512, &ret);
259 if (ret)
Pierre Ossmanaafabfa2007-08-09 14:28:02 +0200260 goto cleanup_queue;
Per Forlin97868a22011-07-09 17:12:36 -0400261
Per Forlin04296b72011-07-01 18:55:31 +0200262 mqrq_prev->sg = mmc_alloc_sg(1, &ret);
263 if (ret)
264 goto cleanup_queue;
265
266 mqrq_prev->bounce_sg =
267 mmc_alloc_sg(bouncesz / 512, &ret);
268 if (ret)
269 goto cleanup_queue;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200270 }
271 }
272#endif
273
Per Forlin04296b72011-07-01 18:55:31 +0200274 if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
Pierre Ossman98ccf142007-05-12 00:26:16 +0200275 blk_queue_bounce_limit(mq->queue, limit);
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500276 blk_queue_max_hw_sectors(mq->queue,
Pierre Ossmanf3eb0aa2008-08-16 21:34:02 +0200277 min(host->max_blk_count, host->max_req_size / 512));
Martin K. Petersena36274e2010-09-10 01:33:59 -0400278 blk_queue_max_segments(mq->queue, host->max_segs);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200279 blk_queue_max_segment_size(mq->queue, host->max_seg_size);
280
Per Forlin97868a22011-07-09 17:12:36 -0400281 mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
282 if (ret)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200283 goto cleanup_queue;
Per Forlin97868a22011-07-09 17:12:36 -0400284
Per Forlin04296b72011-07-01 18:55:31 +0200285
286 mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
287 if (ret)
288 goto cleanup_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 }
290
Thomas Gleixner632cf922010-09-14 07:12:35 -0400291 sema_init(&mq->thread_sem, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Adrian Hunterd09408a2011-06-23 13:40:28 +0300293 mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
294 host->index, subname ? subname : "");
Ethan Dude528fa2010-09-30 18:40:27 -0400295
Christoph Hellwig87598a22006-11-13 20:23:52 +0100296 if (IS_ERR(mq->thread)) {
297 ret = PTR_ERR(mq->thread);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200298 goto free_bounce_sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 }
300
Christoph Hellwig87598a22006-11-13 20:23:52 +0100301 return 0;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200302 free_bounce_sg:
Per Forlin97868a22011-07-09 17:12:36 -0400303 kfree(mqrq_cur->bounce_sg);
304 mqrq_cur->bounce_sg = NULL;
Per Forlin04296b72011-07-01 18:55:31 +0200305 kfree(mqrq_prev->bounce_sg);
306 mqrq_prev->bounce_sg = NULL;
Per Forlin97868a22011-07-09 17:12:36 -0400307
Pierre Ossmanaafabfa2007-08-09 14:28:02 +0200308 cleanup_queue:
Per Forlin97868a22011-07-09 17:12:36 -0400309 kfree(mqrq_cur->sg);
310 mqrq_cur->sg = NULL;
311 kfree(mqrq_cur->bounce_buf);
312 mqrq_cur->bounce_buf = NULL;
313
Per Forlin04296b72011-07-01 18:55:31 +0200314 kfree(mqrq_prev->sg);
315 mqrq_prev->sg = NULL;
316 kfree(mqrq_prev->bounce_buf);
317 mqrq_prev->bounce_buf = NULL;
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 blk_cleanup_queue(mq->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return ret;
321}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323void mmc_cleanup_queue(struct mmc_queue *mq)
324{
Jens Axboe165125e2007-07-24 09:28:11 +0200325 struct request_queue *q = mq->queue;
Pierre Ossman89b4e132006-11-14 22:08:16 +0100326 unsigned long flags;
Per Forlin97868a22011-07-09 17:12:36 -0400327 struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
Per Forlin04296b72011-07-01 18:55:31 +0200328 struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
Pierre Ossman89b4e132006-11-14 22:08:16 +0100329
Pierre Ossmand2b46f62007-04-28 16:52:12 +0200330 /* Make sure the queue isn't suspended, as that will deadlock */
331 mmc_queue_resume(mq);
332
Pierre Ossman89b4e132006-11-14 22:08:16 +0100333 /* Then terminate our worker thread */
Christoph Hellwig87598a22006-11-13 20:23:52 +0100334 kthread_stop(mq->thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Adrian Hunter5fa83ce2010-01-08 14:43:00 -0800336 /* Empty the queue */
337 spin_lock_irqsave(q->queue_lock, flags);
338 q->queuedata = NULL;
339 blk_start_queue(q);
340 spin_unlock_irqrestore(q->queue_lock, flags);
341
Per Forlin97868a22011-07-09 17:12:36 -0400342 kfree(mqrq_cur->bounce_sg);
343 mqrq_cur->bounce_sg = NULL;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200344
Per Forlin97868a22011-07-09 17:12:36 -0400345 kfree(mqrq_cur->sg);
346 mqrq_cur->sg = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Per Forlin97868a22011-07-09 17:12:36 -0400348 kfree(mqrq_cur->bounce_buf);
349 mqrq_cur->bounce_buf = NULL;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200350
Per Forlin04296b72011-07-01 18:55:31 +0200351 kfree(mqrq_prev->bounce_sg);
352 mqrq_prev->bounce_sg = NULL;
353
354 kfree(mqrq_prev->sg);
355 mqrq_prev->sg = NULL;
356
357 kfree(mqrq_prev->bounce_buf);
358 mqrq_prev->bounce_buf = NULL;
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 mq->card = NULL;
361}
362EXPORT_SYMBOL(mmc_cleanup_queue);
363
Seungwon Jeonce39f9d2013-02-06 17:02:46 +0900364int mmc_packed_init(struct mmc_queue *mq, struct mmc_card *card)
365{
366 struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
367 struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
368 int ret = 0;
369
370
371 mqrq_cur->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL);
372 if (!mqrq_cur->packed) {
373 pr_warn("%s: unable to allocate packed cmd for mqrq_cur\n",
374 mmc_card_name(card));
375 ret = -ENOMEM;
376 goto out;
377 }
378
379 mqrq_prev->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL);
380 if (!mqrq_prev->packed) {
381 pr_warn("%s: unable to allocate packed cmd for mqrq_prev\n",
382 mmc_card_name(card));
383 kfree(mqrq_cur->packed);
384 mqrq_cur->packed = NULL;
385 ret = -ENOMEM;
386 goto out;
387 }
388
389 INIT_LIST_HEAD(&mqrq_cur->packed->list);
390 INIT_LIST_HEAD(&mqrq_prev->packed->list);
391
392out:
393 return ret;
394}
395
396void mmc_packed_clean(struct mmc_queue *mq)
397{
398 struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
399 struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
400
401 kfree(mqrq_cur->packed);
402 mqrq_cur->packed = NULL;
403 kfree(mqrq_prev->packed);
404 mqrq_prev->packed = NULL;
405}
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407/**
408 * mmc_queue_suspend - suspend a MMC request queue
409 * @mq: MMC queue to suspend
410 *
411 * Stop the block request queue, and wait for our thread to
412 * complete any outstanding requests. This ensures that we
413 * won't suspend while a request is being processed.
414 */
415void mmc_queue_suspend(struct mmc_queue *mq)
416{
Jens Axboe165125e2007-07-24 09:28:11 +0200417 struct request_queue *q = mq->queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 unsigned long flags;
419
420 if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
421 mq->flags |= MMC_QUEUE_SUSPENDED;
422
423 spin_lock_irqsave(q->queue_lock, flags);
424 blk_stop_queue(q);
425 spin_unlock_irqrestore(q->queue_lock, flags);
426
427 down(&mq->thread_sem);
428 }
429}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431/**
432 * mmc_queue_resume - resume a previously suspended MMC request queue
433 * @mq: MMC queue to resume
434 */
435void mmc_queue_resume(struct mmc_queue *mq)
436{
Jens Axboe165125e2007-07-24 09:28:11 +0200437 struct request_queue *q = mq->queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 unsigned long flags;
439
440 if (mq->flags & MMC_QUEUE_SUSPENDED) {
441 mq->flags &= ~MMC_QUEUE_SUSPENDED;
442
443 up(&mq->thread_sem);
444
445 spin_lock_irqsave(q->queue_lock, flags);
446 blk_start_queue(q);
447 spin_unlock_irqrestore(q->queue_lock, flags);
448 }
449}
Pierre Ossman98ac2162006-12-23 20:03:02 +0100450
Seungwon Jeonce39f9d2013-02-06 17:02:46 +0900451static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
452 struct mmc_packed *packed,
453 struct scatterlist *sg,
454 enum mmc_packed_type cmd_type)
455{
456 struct scatterlist *__sg = sg;
457 unsigned int sg_len = 0;
458 struct request *req;
459
460 if (mmc_packed_wr(cmd_type)) {
461 unsigned int hdr_sz = mmc_large_sector(mq->card) ? 4096 : 512;
462 unsigned int max_seg_sz = queue_max_segment_size(mq->queue);
463 unsigned int len, remain, offset = 0;
464 u8 *buf = (u8 *)packed->cmd_hdr;
465
466 remain = hdr_sz;
467 do {
468 len = min(remain, max_seg_sz);
469 sg_set_buf(__sg, buf + offset, len);
470 offset += len;
471 remain -= len;
472 (__sg++)->page_link &= ~0x02;
473 sg_len++;
474 } while (remain);
475 }
476
477 list_for_each_entry(req, &packed->list, queuelist) {
478 sg_len += blk_rq_map_sg(mq->queue, req, __sg);
479 __sg = sg + (sg_len - 1);
480 (__sg++)->page_link &= ~0x02;
481 }
482 sg_mark_end(sg + (sg_len - 1));
483 return sg_len;
484}
485
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200486/*
487 * Prepare the sg list(s) to be handed of to the host driver
488 */
Per Forlin97868a22011-07-09 17:12:36 -0400489unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200490{
491 unsigned int sg_len;
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200492 size_t buflen;
493 struct scatterlist *sg;
Seungwon Jeonce39f9d2013-02-06 17:02:46 +0900494 enum mmc_packed_type cmd_type;
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200495 int i;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200496
Seungwon Jeonce39f9d2013-02-06 17:02:46 +0900497 cmd_type = mqrq->cmd_type;
498
499 if (!mqrq->bounce_buf) {
500 if (mmc_packed_cmd(cmd_type))
501 return mmc_queue_packed_map_sg(mq, mqrq->packed,
502 mqrq->sg, cmd_type);
503 else
504 return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
505 }
Pierre Ossman98ccf142007-05-12 00:26:16 +0200506
Per Forlin97868a22011-07-09 17:12:36 -0400507 BUG_ON(!mqrq->bounce_sg);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200508
Seungwon Jeonce39f9d2013-02-06 17:02:46 +0900509 if (mmc_packed_cmd(cmd_type))
510 sg_len = mmc_queue_packed_map_sg(mq, mqrq->packed,
511 mqrq->bounce_sg, cmd_type);
512 else
513 sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200514
Per Forlin97868a22011-07-09 17:12:36 -0400515 mqrq->bounce_sg_len = sg_len;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200516
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200517 buflen = 0;
Per Forlin97868a22011-07-09 17:12:36 -0400518 for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200519 buflen += sg->length;
Pierre Ossman98ccf142007-05-12 00:26:16 +0200520
Per Forlin97868a22011-07-09 17:12:36 -0400521 sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200522
523 return 1;
524}
525
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200526/*
527 * If writing, bounce the data to the buffer before the request
528 * is sent to the host driver
529 */
Per Forlin97868a22011-07-09 17:12:36 -0400530void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200531{
Per Forlin97868a22011-07-09 17:12:36 -0400532 if (!mqrq->bounce_buf)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200533 return;
534
Per Forlin97868a22011-07-09 17:12:36 -0400535 if (rq_data_dir(mqrq->req) != WRITE)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200536 return;
537
Per Forlin97868a22011-07-09 17:12:36 -0400538 sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
539 mqrq->bounce_buf, mqrq->sg[0].length);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200540}
541
Pierre Ossman2ff1fa62008-07-22 14:35:42 +0200542/*
543 * If reading, bounce the data from the buffer after the request
544 * has been handled by the host driver
545 */
Per Forlin97868a22011-07-09 17:12:36 -0400546void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200547{
Per Forlin97868a22011-07-09 17:12:36 -0400548 if (!mqrq->bounce_buf)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200549 return;
550
Per Forlin97868a22011-07-09 17:12:36 -0400551 if (rq_data_dir(mqrq->req) != READ)
Pierre Ossman98ccf142007-05-12 00:26:16 +0200552 return;
553
Per Forlin97868a22011-07-09 17:12:36 -0400554 sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
555 mqrq->bounce_buf, mqrq->sg[0].length);
Pierre Ossman98ccf142007-05-12 00:26:16 +0200556}