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android_kernel_samsung_msm8976/drivers/mmc/card/queue.c

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/*
* linux/drivers/mmc/card/queue.c
*
* Copyright (C) 2003 Russell King, All Rights Reserved.
* Copyright 2006-2007 Pierre Ossman
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/scatterlist.h>
#include <linux/bitops.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include "queue.h"
#define MMC_QUEUE_BOUNCESZ 65536
/*
* Based on benchmark tests the default num of requests to trigger the write
* packing was determined, to keep the read latency as low as possible and
* manage to keep the high write throughput.
*/
#define DEFAULT_NUM_REQS_TO_START_PACK 17
/*
* Prepare a MMC request. This just filters out odd stuff.
*/
static int mmc_prep_request(struct request_queue *q, struct request *req)
{
struct mmc_queue *mq = q->queuedata;
/*
* We only like normal block requests and discards.
*/
if (req->cmd_type != REQ_TYPE_FS && !(req->cmd_flags & REQ_DISCARD)) {
blk_dump_rq_flags(req, "MMC bad request");
return BLKPREP_KILL;
}
if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
return BLKPREP_KILL;
req->cmd_flags |= REQ_DONTPREP;
return BLKPREP_OK;
}
static inline bool mmc_cmdq_should_pull_reqs(struct mmc_host *host,
struct mmc_cmdq_context_info *ctx,
struct request *req)
{
bool ret = true;
if ((req->cmd_flags & (REQ_FLUSH | REQ_DISCARD)) &&
test_bit(CMDQ_STATE_DCMD_ACTIVE, &ctx->curr_state))
ret = false;
else if (!host->card->part_curr &&
mmc_host_halt(host) && !mmc_card_suspended(host->card))
ret = false;
else if (test_bit(CMDQ_STATE_ERR, &ctx->curr_state))
ret = false;
else if (!host->card->part_curr && mmc_host_cq_disable(host) &&
!mmc_card_suspended(host->card))
return false;
if (!ret)
pr_debug("%s: %s: skip pulling reqs: state: %lu, cmd_flags: 0x%x\n",
mmc_hostname(host), __func__,
ctx->curr_state, req->cmd_flags);
return ret;
}
static int mmc_cmdq_thread(void *d)
{
struct mmc_queue *mq = d;
struct request_queue *q = mq->queue;
struct mmc_card *card = mq->card;
struct request *req;
struct mmc_host *host = card->host;
struct mmc_cmdq_context_info *ctx = &host->cmdq_ctx;
unsigned long flags;
current->flags |= PF_MEMALLOC;
if (card->host->wakeup_on_idle)
set_wake_up_idle(true);
down(&mq->thread_sem);
while (1) {
int ret = 0;
spin_lock_irqsave(q->queue_lock, flags);
set_current_state(TASK_INTERRUPTIBLE);
req = blk_peek_request(q);
if (req) {
ret = blk_queue_start_tag(q, req);
spin_unlock_irqrestore(q->queue_lock, flags);
if (ret) {
test_and_set_bit(0, &ctx->req_starved);
up(&mq->thread_sem);
schedule_timeout(HZ / 100);
down(&mq->thread_sem);
} else {
if (!mmc_cmdq_should_pull_reqs(host, ctx,
req)) {
spin_lock_irqsave(q->queue_lock, flags);
blk_requeue_request(q, req);
spin_unlock_irqrestore(q->queue_lock,
flags);
test_and_set_bit(0, &ctx->req_starved);
up(&mq->thread_sem);
schedule_timeout(HZ / 100);
down(&mq->thread_sem);
continue;
}
set_current_state(TASK_RUNNING);
ret = mq->cmdq_issue_fn(mq, req);
if (ret)
pr_err("%s: error while cmdq issuing req\n",
mmc_hostname(host));
}
} else {
spin_unlock_irqrestore(q->queue_lock, flags);
if (kthread_should_stop()) {
set_current_state(TASK_RUNNING);
break;
}
up(&mq->thread_sem);
schedule();
down(&mq->thread_sem);
}
} /* loop */
up(&mq->thread_sem);
return 0;
}
static int mmc_queue_thread(void *d)
{
struct mmc_queue *mq = d;
struct request_queue *q = mq->queue;
struct mmc_card *card = mq->card;
current->flags |= PF_MEMALLOC;
if (card->host->wakeup_on_idle)
set_wake_up_idle(true);
down(&mq->thread_sem);
do {
struct request *req = NULL;
struct mmc_queue_req *tmp;
unsigned int cmd_flags = 0;
spin_lock_irq(q->queue_lock);
set_current_state(TASK_INTERRUPTIBLE);
if (mq->mqrq_prev->req &&
(card && (card->type == MMC_TYPE_SD)))
req = NULL;
else
req = blk_fetch_request(q);
mq->mqrq_cur->req = req;
spin_unlock_irq(q->queue_lock);
if (req || mq->mqrq_prev->req) {
set_current_state(TASK_RUNNING);
cmd_flags = req ? req->cmd_flags : 0;
mq->issue_fn(mq, req);
if (test_bit(MMC_QUEUE_NEW_REQUEST, &mq->flags)) {
continue; /* fetch again */
} else if (test_bit(MMC_QUEUE_URGENT_REQUEST,
&mq->flags) && (mq->mqrq_cur->req &&
!(mq->mqrq_cur->req->cmd_flags &
MMC_REQ_NOREINSERT_MASK))) {
/*
* clean current request when urgent request
* processing in progress and current request is
* not urgent (all existing requests completed
* or reinserted to the block layer
*/
mq->mqrq_cur->brq.mrq.data = NULL;
mq->mqrq_cur->req = NULL;
}
/*
* Current request becomes previous request
* and vice versa.
*/
mq->mqrq_prev->brq.mrq.data = NULL;
mq->mqrq_prev->req = NULL;
tmp = mq->mqrq_prev;
mq->mqrq_prev = mq->mqrq_cur;
mq->mqrq_cur = tmp;
} else {
if (kthread_should_stop()) {
set_current_state(TASK_RUNNING);
break;
}
mmc_start_delayed_bkops(card);
mq->card->host->context_info.is_urgent = false;
up(&mq->thread_sem);
schedule();
down(&mq->thread_sem);
}
} while (1);
up(&mq->thread_sem);
return 0;
}
static void mmc_cmdq_dispatch_req(struct request_queue *q)
{
struct mmc_queue *mq = q->queuedata;
wake_up_process(mq->thread);
}
/*
* Generic MMC request handler. This is called for any queue on a
* particular host. When the host is not busy, we look for a request
* on any queue on this host, and attempt to issue it. This may
* not be the queue we were asked to process.
*/
static void mmc_request_fn(struct request_queue *q)
{
struct mmc_queue *mq = q->queuedata;
struct request *req;
unsigned long flags;
struct mmc_context_info *cntx;
if (!mq) {
while ((req = blk_fetch_request(q)) != NULL) {
req->cmd_flags |= REQ_QUIET;
__blk_end_request_all(req, -EIO);
}
return;
}
cntx = &mq->card->host->context_info;
if (!mq->mqrq_cur->req && mq->mqrq_prev->req) {
/*
* New MMC request arrived when MMC thread may be
* blocked on the previous request to be complete
* with no current request fetched
*/
spin_lock_irqsave(&cntx->lock, flags);
if (cntx->is_waiting_last_req) {
cntx->is_new_req = true;
wake_up_interruptible(&cntx->wait);
}
spin_unlock_irqrestore(&cntx->lock, flags);
} else if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
wake_up_process(mq->thread);
}
/*
* mmc_urgent_request() - Urgent MMC request handler.
* @q: request queue.
*
* This is called when block layer has urgent request for delivery. When mmc
* context is waiting for the current request to complete, it will be awaken,
* current request may be interrupted and re-inserted back to block device
* request queue. The next fetched request should be urgent request, this
* will be ensured by block i/o scheduler.
*/
static void mmc_urgent_request(struct request_queue *q)
{
unsigned long flags;
struct mmc_queue *mq = q->queuedata;
struct mmc_context_info *cntx;
if (!mq) {
mmc_request_fn(q);
return;
}
cntx = &mq->card->host->context_info;
/* critical section with mmc_wait_data_done() */
spin_lock_irqsave(&cntx->lock, flags);
/* do stop flow only when mmc thread is waiting for done */
if (mq->mqrq_cur->req || mq->mqrq_prev->req) {
/*
* Urgent request must be executed alone
* so disable the write packing
*/
mmc_blk_disable_wr_packing(mq);
cntx->is_urgent = true;
spin_unlock_irqrestore(&cntx->lock, flags);
wake_up_interruptible(&cntx->wait);
} else {
spin_unlock_irqrestore(&cntx->lock, flags);
mmc_request_fn(q);
}
}
static struct scatterlist *mmc_alloc_sg(int sg_len, int *err)
{
struct scatterlist *sg;
sg = kmalloc(sizeof(struct scatterlist)*sg_len, GFP_KERNEL);
if (!sg)
*err = -ENOMEM;
else {
*err = 0;
sg_init_table(sg, sg_len);
}
return sg;
}
static void mmc_queue_setup_discard(struct request_queue *q,
struct mmc_card *card)
{
unsigned max_discard;
max_discard = mmc_calc_max_discard(card);
if (!max_discard)
return;
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
q->limits.max_discard_sectors = max_discard;
if (card->erased_byte == 0 && !mmc_can_discard(card))
q->limits.discard_zeroes_data = 1;
q->limits.discard_granularity = card->pref_erase << 9;
/* granularity must not be greater than max. discard */
if (card->pref_erase > max_discard)
q->limits.discard_granularity = 0;
if (mmc_can_secure_erase_trim(card))
queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
}
/**
* mmc_blk_cmdq_setup_queue
* @mq: mmc queue
* @card: card to attach to this queue
*
* Setup queue for CMDQ supporting MMC card
*/
void mmc_cmdq_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
{
u64 limit = BLK_BOUNCE_HIGH;
struct mmc_host *host = card->host;
if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
limit = *mmc_dev(host)->dma_mask;
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
if (mmc_can_erase(card))
mmc_queue_setup_discard(mq->queue, card);
blk_queue_bounce_limit(mq->queue, limit);
blk_queue_max_hw_sectors(mq->queue, min(host->max_blk_count,
host->max_req_size / 512));
blk_queue_max_segment_size(mq->queue, host->max_seg_size);
blk_queue_max_segments(mq->queue, host->max_segs);
}
/**
* mmc_init_queue - initialise a queue structure.
* @mq: mmc queue
* @card: mmc card to attach this queue
* @lock: queue lock
* @subname: partition subname
*
* Initialise a MMC card request queue.
*/
int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
spinlock_t *lock, const char *subname, int area_type)
{
struct mmc_host *host = card->host;
u64 limit = BLK_BOUNCE_HIGH;
int ret;
struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
limit = *mmc_dev(host)->dma_mask;
mq->card = card;
if (card->ext_csd.cmdq_support &&
(area_type == MMC_BLK_DATA_AREA_MAIN)) {
mq->queue = blk_init_queue(mmc_cmdq_dispatch_req, lock);
if (!mq->queue)
return -ENOMEM;
mmc_cmdq_setup_queue(mq, card);
ret = mmc_cmdq_init(mq, card);
if (ret) {
pr_err("%s: %d: cmdq: unable to set-up\n",
mmc_hostname(card->host), ret);
blk_cleanup_queue(mq->queue);
} else {
sema_init(&mq->thread_sem, 1);
mq->queue->queuedata = mq;
mq->thread = kthread_run(mmc_cmdq_thread, mq,
"mmc-cmdqd/%d%s",
host->index,
subname ? subname : "");
if (IS_ERR(mq->thread)) {
pr_err("%s: %d: cmdq: failed to start mmc-cmdqd thread\n",
mmc_hostname(card->host), ret);
ret = PTR_ERR(mq->thread);
}
return ret;
}
}
mq->queue = blk_init_queue(mmc_request_fn, lock);
if (!mq->queue)
return -ENOMEM;
if ((host->caps2 & MMC_CAP2_STOP_REQUEST) &&
host->ops->stop_request &&
mq->card->ext_csd.hpi_en)
blk_urgent_request(mq->queue, mmc_urgent_request);
mq->mqrq_cur = mqrq_cur;
mq->mqrq_prev = mqrq_prev;
mq->queue->queuedata = mq;
mq->num_wr_reqs_to_start_packing =
min_t(int, (int)card->ext_csd.max_packed_writes,
DEFAULT_NUM_REQS_TO_START_PACK);
blk_queue_prep_rq(mq->queue, mmc_prep_request);
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
if (mmc_can_erase(card))
mmc_queue_setup_discard(mq->queue, card);
#ifdef CONFIG_MMC_BLOCK_BOUNCE
if (host->max_segs == 1) {
unsigned int bouncesz;
bouncesz = MMC_QUEUE_BOUNCESZ;
if (bouncesz > host->max_req_size)
bouncesz = host->max_req_size;
if (bouncesz > host->max_seg_size)
bouncesz = host->max_seg_size;
if (bouncesz > (host->max_blk_count * 512))
bouncesz = host->max_blk_count * 512;
if (bouncesz > 512) {
mqrq_cur->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
if (!mqrq_cur->bounce_buf) {
pr_warning("%s: unable to "
"allocate bounce cur buffer\n",
mmc_card_name(card));
}
mqrq_prev->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
if (!mqrq_prev->bounce_buf) {
pr_warning("%s: unable to "
"allocate bounce prev buffer\n",
mmc_card_name(card));
kfree(mqrq_cur->bounce_buf);
mqrq_cur->bounce_buf = NULL;
}
}
if (mqrq_cur->bounce_buf && mqrq_prev->bounce_buf) {
blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
blk_queue_max_hw_sectors(mq->queue, bouncesz / 512);
blk_queue_max_segments(mq->queue, bouncesz / 512);
blk_queue_max_segment_size(mq->queue, bouncesz);
mqrq_cur->sg = mmc_alloc_sg(1, &ret);
if (ret)
goto cleanup_queue;
mqrq_cur->bounce_sg =
mmc_alloc_sg(bouncesz / 512, &ret);
if (ret)
goto cleanup_queue;
mqrq_prev->sg = mmc_alloc_sg(1, &ret);
if (ret)
goto cleanup_queue;
mqrq_prev->bounce_sg =
mmc_alloc_sg(bouncesz / 512, &ret);
if (ret)
goto cleanup_queue;
}
}
#endif
if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
unsigned int max_segs = host->max_segs;
blk_queue_bounce_limit(mq->queue, limit);
blk_queue_max_hw_sectors(mq->queue,
min(host->max_blk_count, host->max_req_size / 512));
blk_queue_max_segment_size(mq->queue, host->max_seg_size);
retry:
blk_queue_max_segments(mq->queue, host->max_segs);
mqrq_cur->sg = mmc_alloc_sg(host->max_segs, &ret);
if (ret == -ENOMEM)
goto cur_sg_alloc_failed;
else if (ret)
goto cleanup_queue;
mqrq_prev->sg = mmc_alloc_sg(host->max_segs, &ret);
if (ret == -ENOMEM)
goto prev_sg_alloc_failed;
else if (ret)
goto cleanup_queue;
goto success;
prev_sg_alloc_failed:
kfree(mqrq_cur->sg);
mqrq_cur->sg = NULL;
cur_sg_alloc_failed:
host->max_segs /= 2;
if (host->max_segs) {
goto retry;
} else {
host->max_segs = max_segs;
goto cleanup_queue;
}
}
success:
sema_init(&mq->thread_sem, 1);
mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
host->index, subname ? subname : "");
if (IS_ERR(mq->thread)) {
ret = PTR_ERR(mq->thread);
goto free_bounce_sg;
}
return 0;
free_bounce_sg:
kfree(mqrq_cur->bounce_sg);
mqrq_cur->bounce_sg = NULL;
kfree(mqrq_prev->bounce_sg);
mqrq_prev->bounce_sg = NULL;
cleanup_queue:
kfree(mqrq_cur->sg);
mqrq_cur->sg = NULL;
kfree(mqrq_cur->bounce_buf);
mqrq_cur->bounce_buf = NULL;
kfree(mqrq_prev->sg);
mqrq_prev->sg = NULL;
kfree(mqrq_prev->bounce_buf);
mqrq_prev->bounce_buf = NULL;
blk_cleanup_queue(mq->queue);
return ret;
}
void mmc_cleanup_queue(struct mmc_queue *mq)
{
struct request_queue *q = mq->queue;
unsigned long flags;
struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
/* Make sure the queue isn't suspended, as that will deadlock */
mmc_queue_resume(mq);
/* Then terminate our worker thread */
kthread_stop(mq->thread);
/* Empty the queue */
spin_lock_irqsave(q->queue_lock, flags);
q->queuedata = NULL;
blk_start_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
kfree(mqrq_cur->bounce_sg);
mqrq_cur->bounce_sg = NULL;
kfree(mqrq_cur->sg);
mqrq_cur->sg = NULL;
kfree(mqrq_cur->bounce_buf);
mqrq_cur->bounce_buf = NULL;
kfree(mqrq_prev->bounce_sg);
mqrq_prev->bounce_sg = NULL;
kfree(mqrq_prev->sg);
mqrq_prev->sg = NULL;
kfree(mqrq_prev->bounce_buf);
mqrq_prev->bounce_buf = NULL;
mq->card = NULL;
}
EXPORT_SYMBOL(mmc_cleanup_queue);
int mmc_packed_init(struct mmc_queue *mq, struct mmc_card *card)
{
struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
int ret = 0;
mqrq_cur->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL);
if (!mqrq_cur->packed) {
pr_warn("%s: unable to allocate packed cmd for mqrq_cur\n",
mmc_card_name(card));
ret = -ENOMEM;
goto out;
}
mqrq_prev->packed = kzalloc(sizeof(struct mmc_packed), GFP_KERNEL);
if (!mqrq_prev->packed) {
pr_warn("%s: unable to allocate packed cmd for mqrq_prev\n",
mmc_card_name(card));
kfree(mqrq_cur->packed);
mqrq_cur->packed = NULL;
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&mqrq_cur->packed->list);
INIT_LIST_HEAD(&mqrq_prev->packed->list);
out:
return ret;
}
void mmc_packed_clean(struct mmc_queue *mq)
{
struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
kfree(mqrq_cur->packed);
mqrq_cur->packed = NULL;
kfree(mqrq_prev->packed);
mqrq_prev->packed = NULL;
}
static void mmc_cmdq_softirq_done(struct request *rq)
{
struct mmc_queue *mq = rq->q->queuedata;
mq->cmdq_complete_fn(rq);
}
static void mmc_cmdq_error_work(struct work_struct *work)
{
struct mmc_queue *mq = container_of(work, struct mmc_queue,
cmdq_err_work);
mq->cmdq_error_fn(mq);
}
enum blk_eh_timer_return mmc_cmdq_rq_timed_out(struct request *req)
{
struct mmc_queue *mq = req->q->queuedata;
pr_err("%s: request with tag: %d flags: 0x%x timed out\n",
mmc_hostname(mq->card->host), req->tag, req->cmd_flags);
return mq->cmdq_req_timed_out(req);
}
int mmc_cmdq_init(struct mmc_queue *mq, struct mmc_card *card)
{
int i, ret = 0;
/* one slot is reserved for dcmd requests */
int q_depth = card->ext_csd.cmdq_depth - 1;
card->cmdq_init = false;
if (!(card->host->caps2 & MMC_CAP2_CMD_QUEUE)) {
ret = -ENOTSUPP;
goto out;
}
init_waitqueue_head(&card->host->cmdq_ctx.queue_empty_wq);
mq->mqrq_cmdq = kzalloc(
sizeof(struct mmc_queue_req) * q_depth, GFP_KERNEL);
if (!mq->mqrq_cmdq) {
pr_warn("%s: unable to allocate mqrq's for q_depth %d\n",
mmc_card_name(card), q_depth);
ret = -ENOMEM;
goto out;
}
/* sg is allocated for data request slots only */
for (i = 0; i < q_depth; i++) {
mq->mqrq_cmdq[i].sg = mmc_alloc_sg(card->host->max_segs, &ret);
if (ret) {
pr_warn("%s: unable to allocate cmdq sg of size %d\n",
mmc_card_name(card),
card->host->max_segs);
goto free_mqrq_sg;
}
}
ret = blk_queue_init_tags(mq->queue, q_depth, NULL);
if (ret) {
pr_warn("%s: unable to allocate cmdq tags %d\n",
mmc_card_name(card), q_depth);
goto free_mqrq_sg;
}
blk_queue_softirq_done(mq->queue, mmc_cmdq_softirq_done);
INIT_WORK(&mq->cmdq_err_work, mmc_cmdq_error_work);
init_completion(&mq->cmdq_shutdown_complete);
init_completion(&mq->cmdq_pending_req_done);
blk_queue_rq_timed_out(mq->queue, mmc_cmdq_rq_timed_out);
blk_queue_rq_timeout(mq->queue, 120 * HZ);
card->cmdq_init = true;
goto out;
free_mqrq_sg:
for (i = 0; i < q_depth; i++)
kfree(mq->mqrq_cmdq[i].sg);
kfree(mq->mqrq_cmdq);
mq->mqrq_cmdq = NULL;
out:
return ret;
}
void mmc_cmdq_clean(struct mmc_queue *mq, struct mmc_card *card)
{
int i;
int q_depth = card->ext_csd.cmdq_depth - 1;
blk_free_tags(mq->queue->queue_tags);
mq->queue->queue_tags = NULL;
blk_queue_free_tags(mq->queue);
for (i = 0; i < q_depth; i++)
kfree(mq->mqrq_cmdq[i].sg);
kfree(mq->mqrq_cmdq);
mq->mqrq_cmdq = NULL;
}
/**
* mmc_queue_suspend - suspend a MMC request queue
* @mq: MMC queue to suspend
* @wait: Wait till MMC request queue is empty
*
* Stop the block request queue, and wait for our thread to
* complete any outstanding requests. This ensures that we
* won't suspend while a request is being processed.
*/
int mmc_queue_suspend(struct mmc_queue *mq, int wait)
{
struct request_queue *q = mq->queue;
struct request *req;
unsigned long flags;
int rc = 0;
struct mmc_card *card = mq->card;
if (card->cmdq_init && blk_queue_tagged(q)) {
struct mmc_host *host = card->host;
spin_lock_irqsave(q->queue_lock, flags);
blk_stop_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
if (wait) {
/*
* Wait for already queued requests to be issued by
* mmc_cmdqd.
*/
down(&mq->thread_sem);
/* Wait for already issued requests to complete */
if (host->cmdq_ctx.active_reqs)
wait_for_completion(
&mq->cmdq_shutdown_complete);
mq->cmdq_shutdown(mq);
} else if (!test_and_set_bit(MMC_QUEUE_SUSPENDED, &mq->flags)) {
rc = down_trylock(&mq->thread_sem);
if (rc || host->cmdq_ctx.active_reqs) {
clear_bit(MMC_QUEUE_SUSPENDED, &mq->flags);
spin_lock_irqsave(q->queue_lock, flags);
blk_start_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
if (!rc)
up(&mq->thread_sem);
rc = -EBUSY;
}
}
goto out;
}
if (!(test_and_set_bit(MMC_QUEUE_SUSPENDED, &mq->flags))) {
spin_lock_irqsave(q->queue_lock, flags);
blk_stop_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
rc = down_trylock(&mq->thread_sem);
if (rc && !wait) {
/*
* Failed to take the lock so better to abort the
* suspend because mmcqd thread is processing requests.
*/
clear_bit(MMC_QUEUE_SUSPENDED, &mq->flags);
spin_lock_irqsave(q->queue_lock, flags);
blk_start_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
rc = -EBUSY;
} else if (wait) {
printk("%s: mq->flags: %ld, q->queue_flags: %lu,\
q->in_flight (%d, %d)\n",
mmc_hostname(mq->card->host), mq->flags,
q->queue_flags, q->in_flight[0], q->in_flight[1]);
/*
* wait is set only when mmc_blk_shutdown calls this,
*/
mutex_lock(&q->sysfs_lock);
queue_flag_set_unlocked(QUEUE_FLAG_DYING, q);
spin_lock_irqsave(q->queue_lock, flags);
queue_flag_set(QUEUE_FLAG_DYING, q);
while ((req = blk_fetch_request(q)) != NULL) {
req->cmd_flags |= REQ_QUIET;
__blk_end_request_all(req, -EIO);
}
spin_unlock_irqrestore(q->queue_lock, flags);
mutex_unlock(&q->sysfs_lock);
if (rc) {
down(&mq->thread_sem);
rc = 0;
}
}
}
out:
return rc;
}
/**
* mmc_queue_resume - resume a previously suspended MMC request queue
* @mq: MMC queue to resume
*/
void mmc_queue_resume(struct mmc_queue *mq)
{
struct request_queue *q = mq->queue;
unsigned long flags;
if (test_and_clear_bit(MMC_QUEUE_SUSPENDED, &mq->flags)) {
up(&mq->thread_sem);
spin_lock_irqsave(q->queue_lock, flags);
blk_start_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
}
static unsigned int mmc_queue_packed_map_sg(struct mmc_queue *mq,
struct mmc_packed *packed,
struct scatterlist *sg,
enum mmc_packed_type cmd_type)
{
struct scatterlist *__sg = sg;
unsigned int sg_len = 0;
struct request *req;
if (mmc_packed_wr(cmd_type)) {
unsigned int hdr_sz = mmc_large_sector(mq->card) ? 4096 : 512;
unsigned int max_seg_sz = queue_max_segment_size(mq->queue);
unsigned int len, remain, offset = 0;
u8 *buf = (u8 *)packed->cmd_hdr;
remain = hdr_sz;
do {
len = min(remain, max_seg_sz);
sg_set_buf(__sg, buf + offset, len);
offset += len;
remain -= len;
(__sg++)->page_link &= ~0x02;
sg_len++;
} while (remain);
}
list_for_each_entry(req, &packed->list, queuelist) {
sg_len += blk_rq_map_sg(mq->queue, req, __sg);
__sg = sg + (sg_len - 1);
(__sg++)->page_link &= ~0x02;
}
sg_mark_end(sg + (sg_len - 1));
return sg_len;
}
/*
* Prepare the sg list(s) to be handed of to the host driver
*/
unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq)
{
unsigned int sg_len;
size_t buflen;
struct scatterlist *sg;
enum mmc_packed_type cmd_type;
int i;
cmd_type = mqrq->cmd_type;
if (!mqrq->bounce_buf) {
if (mmc_packed_cmd(cmd_type))
return mmc_queue_packed_map_sg(mq, mqrq->packed,
mqrq->sg, cmd_type);
else
return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
}
BUG_ON(!mqrq->bounce_sg);
if (mmc_packed_cmd(cmd_type))
sg_len = mmc_queue_packed_map_sg(mq, mqrq->packed,
mqrq->bounce_sg, cmd_type);
else
sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
mqrq->bounce_sg_len = sg_len;
buflen = 0;
for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
buflen += sg->length;
sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
return 1;
}
/*
* If writing, bounce the data to the buffer before the request
* is sent to the host driver
*/
void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
{
if (!mqrq->bounce_buf)
return;
if (rq_data_dir(mqrq->req) != WRITE)
return;
sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
mqrq->bounce_buf, mqrq->sg[0].length);
}
/*
* If reading, bounce the data from the buffer after the request
* has been handled by the host driver
*/
void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
{
if (!mqrq->bounce_buf)
return;
if (rq_data_dir(mqrq->req) != READ)
return;
sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
mqrq->bounce_buf, mqrq->sg[0].length);
}
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