blob: ca0c0a0342b80339a3afa7a8b5c3c9d7fbef30b1 [file] [log] [blame]
/*
* 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/dma-mapping.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include "queue.h"
#include "block.h"
#include "core.h"
#include "card.h"
#define MMC_QUEUE_BOUNCESZ 65536
/*
* 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;
if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
return BLKPREP_KILL;
req->rq_flags |= RQF_DONTPREP;
req_to_mmc_queue_req(req)->retries = 0;
return BLKPREP_OK;
}
static void mmc_cqe_request_fn(struct request_queue *q)
{
struct mmc_queue *mq = q->queuedata;
struct request *req;
if (!mq) {
while ((req = blk_fetch_request(q)) != NULL) {
req->rq_flags |= RQF_QUIET;
__blk_end_request_all(req, -EIO);
}
return;
}
if (mq->asleep && !mq->cqe_busy)
wake_up_process(mq->thread);
}
static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
{
/* Allow only 1 DCMD at a time */
return mq->cqe_in_flight[MMC_ISSUE_DCMD];
}
void mmc_cqe_kick_queue(struct mmc_queue *mq)
{
if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
mq->cqe_busy &= ~MMC_CQE_QUEUE_FULL;
if (mq->asleep && !mq->cqe_busy)
__blk_run_queue(mq->queue);
}
static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
{
return host->caps2 & MMC_CAP2_CQE_DCMD;
}
enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
struct request *req)
{
if (req && ((req_op(req) == REQ_OP_DISCARD) || (req_op(req) == REQ_OP_SECURE_ERASE))) {
return MMC_ISSUE_SYNC;
} else if (req && req_op(req) == REQ_OP_FLUSH) {
return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
} else {
return MMC_ISSUE_ASYNC;
}
}
static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
{
if (!mq->cqe_recovery_needed) {
mq->cqe_recovery_needed = true;
wake_up_process(mq->thread);
}
}
static void mmc_cqe_recovery_notifier(struct mmc_host *host,
struct mmc_request *mrq)
{
struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
brq.mrq);
struct request *req = mqrq->req;
struct request_queue *q = req->q;
struct mmc_queue *mq = q->queuedata;
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
__mmc_cqe_recovery_notifier(mq);
spin_unlock_irqrestore(q->queue_lock, flags);
}
static int mmc_cqe_thread(void *d)
{
struct mmc_queue *mq = d;
struct request_queue *q = mq->queue;
struct mmc_card *card = mq->card;
struct mmc_host *host = card->host;
unsigned long flags;
int get_put = 0;
current->flags |= PF_MEMALLOC;
down(&mq->thread_sem);
spin_lock_irqsave(q->queue_lock, flags);
while (1) {
struct request *req = NULL;
enum mmc_issue_type issue_type;
bool retune_ok = false;
if (mq->cqe_recovery_needed) {
spin_unlock_irqrestore(q->queue_lock, flags);
mmc_blk_cqe_recovery(mq);
spin_lock_irqsave(q->queue_lock, flags);
mq->cqe_recovery_needed = false;
}
set_current_state(TASK_INTERRUPTIBLE);
if (!kthread_should_stop())
req = blk_peek_request(q);
if (req) {
issue_type = mmc_cqe_issue_type(host, req);
switch (issue_type) {
case MMC_ISSUE_DCMD:
if (mmc_cqe_dcmd_busy(mq)) {
mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
req = NULL;
break;
}
/* Fall through */
case MMC_ISSUE_ASYNC:
if (blk_queue_start_tag(q, req)) {
mq->cqe_busy |= MMC_CQE_QUEUE_FULL;
req = NULL;
}
break;
default:
/*
* Timeouts are handled by mmc core, so set a
* large value to avoid races.
*/
req->timeout = 600 * HZ;
blk_start_request(req);
break;
}
if (req) {
mq->cqe_in_flight[issue_type] += 1;
if (mmc_cqe_tot_in_flight(mq) == 1)
get_put += 1;
if (mmc_cqe_qcnt(mq) == 1)
retune_ok = true;
}
}
mq->asleep = !req;
spin_unlock_irqrestore(q->queue_lock, flags);
if (req) {
enum mmc_issued issued;
set_current_state(TASK_RUNNING);
if (get_put) {
get_put = 0;
mmc_get_card(card);
}
if (host->need_retune && retune_ok &&
!host->hold_retune)
host->retune_now = true;
else
host->retune_now = false;
issued = mmc_blk_cqe_issue_rq(mq, req);
cond_resched();
spin_lock_irqsave(q->queue_lock, flags);
switch (issued) {
case MMC_REQ_STARTED:
break;
case MMC_REQ_BUSY:
blk_requeue_request(q, req);
goto finished;
case MMC_REQ_FAILED_TO_START:
__blk_end_request_all(req, -EIO);
/* Fall through */
case MMC_REQ_FINISHED:
finished:
mq->cqe_in_flight[issue_type] -= 1;
if (mmc_cqe_tot_in_flight(mq) == 0)
get_put = -1;
}
} else {
if (get_put < 0) {
get_put = 0;
mmc_put_card(card);
}
/*
* Do not stop with requests in flight in case recovery
* is needed.
*/
if (kthread_should_stop() &&
!mmc_cqe_tot_in_flight(mq)) {
set_current_state(TASK_RUNNING);
break;
}
up(&mq->thread_sem);
schedule();
down(&mq->thread_sem);
spin_lock_irqsave(q->queue_lock, flags);
}
} /* loop */
up(&mq->thread_sem);
return 0;
}
static enum blk_eh_timer_return __mmc_cqe_timed_out(struct request *req)
{
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
struct mmc_request *mrq = &mqrq->brq.mrq;
struct mmc_queue *mq = req->q->queuedata;
struct mmc_host *host = mq->card->host;
enum mmc_issue_type issue_type = mmc_cqe_issue_type(host, req);
bool recovery_needed = false;
switch (issue_type) {
case MMC_ISSUE_ASYNC:
case MMC_ISSUE_DCMD:
if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
if (recovery_needed)
__mmc_cqe_recovery_notifier(mq);
return BLK_EH_RESET_TIMER;
}
/* No timeout */
return BLK_EH_HANDLED;
default:
/* Timeout is handled by mmc core */
return BLK_EH_RESET_TIMER;
}
}
static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
{
struct mmc_queue *mq = req->q->queuedata;
if (mq->cqe_recovery_needed)
return BLK_EH_RESET_TIMER;
return __mmc_cqe_timed_out(req);
}
static int mmc_queue_thread(void *d)
{
struct mmc_queue *mq = d;
struct request_queue *q = mq->queue;
struct mmc_context_info *cntx = &mq->card->host->context_info;
current->flags |= PF_MEMALLOC;
down(&mq->thread_sem);
do {
struct request *req;
spin_lock_irq(q->queue_lock);
set_current_state(TASK_INTERRUPTIBLE);
req = blk_fetch_request(q);
mq->asleep = false;
cntx->is_waiting_last_req = false;
cntx->is_new_req = false;
if (!req) {
/*
* Dispatch queue is empty so set flags for
* mmc_request_fn() to wake us up.
*/
if (mq->qcnt)
cntx->is_waiting_last_req = true;
else
mq->asleep = true;
}
spin_unlock_irq(q->queue_lock);
if (req || mq->qcnt) {
set_current_state(TASK_RUNNING);
mmc_blk_issue_rq(mq, req);
cond_resched();
} else {
if (kthread_should_stop()) {
set_current_state(TASK_RUNNING);
break;
}
up(&mq->thread_sem);
schedule();
down(&mq->thread_sem);
}
} while (1);
up(&mq->thread_sem);
return 0;
}
/*
* 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;
struct mmc_context_info *cntx;
if (!mq) {
while ((req = blk_fetch_request(q)) != NULL) {
req->rq_flags |= RQF_QUIET;
__blk_end_request_all(req, -EIO);
}
return;
}
cntx = &mq->card->host->context_info;
if (cntx->is_waiting_last_req) {
cntx->is_new_req = true;
wake_up_interruptible(&cntx->wait);
}
if (mq->asleep)
wake_up_process(mq->thread);
}
static struct scatterlist *mmc_alloc_sg(int sg_len, gfp_t gfp)
{
struct scatterlist *sg;
sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
if (sg)
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);
blk_queue_max_discard_sectors(q, 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_SECERASE, q);
}
static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
{
unsigned int bouncesz = MMC_QUEUE_BOUNCESZ;
if (host->max_segs != 1 || (host->caps & MMC_CAP_NO_BOUNCE_BUFF))
return 0;
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)
return 0;
return bouncesz;
}
/**
* mmc_init_request() - initialize the MMC-specific per-request data
* @q: the request queue
* @req: the request
* @gfp: memory allocation policy
*/
static int mmc_init_request(struct request_queue *q, struct request *req,
gfp_t gfp)
{
struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
struct mmc_queue *mq = q->queuedata;
struct mmc_card *card = mq->card;
struct mmc_host *host = card->host;
mq_rq->req = req;
if (card->bouncesz) {
mq_rq->bounce_buf = kmalloc(card->bouncesz, gfp);
if (!mq_rq->bounce_buf)
return -ENOMEM;
if (card->bouncesz > 512) {
mq_rq->sg = mmc_alloc_sg(1, gfp);
if (!mq_rq->sg)
return -ENOMEM;
mq_rq->bounce_sg = mmc_alloc_sg(card->bouncesz / 512,
gfp);
if (!mq_rq->bounce_sg)
return -ENOMEM;
}
} else {
mq_rq->bounce_buf = NULL;
mq_rq->bounce_sg = NULL;
mq_rq->sg = mmc_alloc_sg(host->max_segs, gfp);
if (!mq_rq->sg)
return -ENOMEM;
}
return 0;
}
static void mmc_exit_request(struct request_queue *q, struct request *req)
{
struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
/* It is OK to kfree(NULL) so this will be smooth */
kfree(mq_rq->bounce_sg);
mq_rq->bounce_sg = NULL;
kfree(mq_rq->bounce_buf);
mq_rq->bounce_buf = NULL;
kfree(mq_rq->sg);
mq_rq->sg = NULL;
mq_rq->req = NULL;
}
/**
* 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 = -ENOMEM;
bool use_cqe = host->cqe_enabled && area_type != MMC_BLK_DATA_AREA_RPMB;
if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
mq->card = card;
mq->queue = blk_alloc_queue(GFP_KERNEL);
if (!mq->queue)
return -ENOMEM;
mq->queue->queue_lock = lock;
mq->queue->request_fn = use_cqe ? mmc_cqe_request_fn : mmc_request_fn;
mq->queue->init_rq_fn = mmc_init_request;
mq->queue->exit_rq_fn = mmc_exit_request;
mq->queue->cmd_size = sizeof(struct mmc_queue_req);
mq->queue->queuedata = mq;
mq->qcnt = 0;
ret = blk_init_allocated_queue(mq->queue);
if (ret) {
blk_cleanup_queue(mq->queue);
return ret;
}
if (use_cqe) {
int q_depth = card->ext_csd.cmdq_depth;
if (q_depth > host->cqe_qdepth)
q_depth = host->cqe_qdepth;
ret = blk_queue_init_tags(mq->queue, q_depth, NULL,
BLK_TAG_ALLOC_FIFO);
if (ret)
goto cleanup_queue;
blk_queue_softirq_done(mq->queue, mmc_blk_cqe_complete_rq);
blk_queue_rq_timed_out(mq->queue, mmc_cqe_timed_out);
blk_queue_rq_timeout(mq->queue, 60 * HZ);
host->cqe_recovery_notifier = mmc_cqe_recovery_notifier;
}
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);
card->bouncesz = mmc_queue_calc_bouncesz(host);
if (card->bouncesz) {
blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
blk_queue_max_hw_sectors(mq->queue, card->bouncesz / 512);
blk_queue_max_segments(mq->queue, card->bouncesz / 512);
blk_queue_max_segment_size(mq->queue, card->bouncesz);
} else {
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_segments(mq->queue, host->max_segs);
blk_queue_max_segment_size(mq->queue, host->max_seg_size);
}
sema_init(&mq->thread_sem, 1);
mq->thread = kthread_run(use_cqe ? mmc_cqe_thread : mmc_queue_thread,
mq, "mmcqd/%d%s", host->index,
subname ? subname : "");
if (IS_ERR(mq->thread)) {
ret = PTR_ERR(mq->thread);
goto cleanup_queue;
}
return 0;
cleanup_queue:
blk_cleanup_queue(mq->queue);
return ret;
}
void mmc_cleanup_queue(struct mmc_queue *mq)
{
struct request_queue *q = mq->queue;
unsigned long flags;
/* 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);
mq->card = NULL;
}
EXPORT_SYMBOL(mmc_cleanup_queue);
/**
* mmc_queue_suspend - suspend a MMC request queue
* @mq: MMC queue to suspend
*
* 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.
*/
void mmc_queue_suspend(struct mmc_queue *mq)
{
struct request_queue *q = mq->queue;
unsigned long flags;
if (!mq->suspended) {
mq->suspended |= true;
spin_lock_irqsave(q->queue_lock, flags);
blk_stop_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
down(&mq->thread_sem);
}
}
/**
* 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 (mq->suspended) {
mq->suspended = false;
up(&mq->thread_sem);
spin_lock_irqsave(q->queue_lock, flags);
blk_start_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
}
/*
* 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;
int i;
if (!mqrq->bounce_buf)
return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
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);
}