![Bart Van Assche](/assets/img/avatar_default.png)
This patch has been generated as follows: for verb in set_unlocked clear_unlocked set clear; do replace-in-files queue_flag_${verb} blk_queue_flag_${verb%_unlocked} \ $(git grep -lw queue_flag_${verb} drivers block/bsg*) done Except for protecting all queue flag changes with the queue lock this patch does not change any functionality. Cc: Mike Snitzer <snitzer@redhat.com> Cc: Shaohua Li <shli@fb.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
514 lines
12 KiB
C
514 lines
12 KiB
C
/*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include "queue.h"
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#include "block.h"
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#include "core.h"
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#include "card.h"
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#include "host.h"
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static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
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{
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/* Allow only 1 DCMD at a time */
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return mq->in_flight[MMC_ISSUE_DCMD];
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}
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void mmc_cqe_check_busy(struct mmc_queue *mq)
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{
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if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq))
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mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
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mq->cqe_busy &= ~MMC_CQE_QUEUE_FULL;
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}
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static inline bool mmc_cqe_can_dcmd(struct mmc_host *host)
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{
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return host->caps2 & MMC_CAP2_CQE_DCMD;
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}
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static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
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struct request *req)
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{
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switch (req_op(req)) {
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case REQ_OP_DRV_IN:
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case REQ_OP_DRV_OUT:
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case REQ_OP_DISCARD:
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case REQ_OP_SECURE_ERASE:
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return MMC_ISSUE_SYNC;
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case REQ_OP_FLUSH:
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return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
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default:
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return MMC_ISSUE_ASYNC;
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}
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}
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enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req)
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{
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struct mmc_host *host = mq->card->host;
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if (mq->use_cqe)
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return mmc_cqe_issue_type(host, req);
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if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE)
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return MMC_ISSUE_ASYNC;
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return MMC_ISSUE_SYNC;
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}
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static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq)
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{
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if (!mq->recovery_needed) {
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mq->recovery_needed = true;
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schedule_work(&mq->recovery_work);
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}
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}
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void mmc_cqe_recovery_notifier(struct mmc_request *mrq)
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{
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struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
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brq.mrq);
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struct request *req = mmc_queue_req_to_req(mqrq);
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struct request_queue *q = req->q;
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struct mmc_queue *mq = q->queuedata;
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unsigned long flags;
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spin_lock_irqsave(q->queue_lock, flags);
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__mmc_cqe_recovery_notifier(mq);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
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{
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struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
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struct mmc_request *mrq = &mqrq->brq.mrq;
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struct mmc_queue *mq = req->q->queuedata;
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struct mmc_host *host = mq->card->host;
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enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
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bool recovery_needed = false;
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switch (issue_type) {
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case MMC_ISSUE_ASYNC:
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case MMC_ISSUE_DCMD:
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if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) {
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if (recovery_needed)
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__mmc_cqe_recovery_notifier(mq);
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return BLK_EH_RESET_TIMER;
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}
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/* No timeout */
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return BLK_EH_HANDLED;
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default:
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/* Timeout is handled by mmc core */
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return BLK_EH_RESET_TIMER;
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}
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}
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static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req,
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bool reserved)
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{
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struct request_queue *q = req->q;
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struct mmc_queue *mq = q->queuedata;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(q->queue_lock, flags);
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if (mq->recovery_needed || !mq->use_cqe)
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ret = BLK_EH_RESET_TIMER;
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else
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ret = mmc_cqe_timed_out(req);
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spin_unlock_irqrestore(q->queue_lock, flags);
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return ret;
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}
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static void mmc_mq_recovery_handler(struct work_struct *work)
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{
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struct mmc_queue *mq = container_of(work, struct mmc_queue,
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recovery_work);
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struct request_queue *q = mq->queue;
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mmc_get_card(mq->card, &mq->ctx);
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mq->in_recovery = true;
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if (mq->use_cqe)
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mmc_blk_cqe_recovery(mq);
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else
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mmc_blk_mq_recovery(mq);
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mq->in_recovery = false;
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spin_lock_irq(q->queue_lock);
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mq->recovery_needed = false;
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spin_unlock_irq(q->queue_lock);
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mmc_put_card(mq->card, &mq->ctx);
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blk_mq_run_hw_queues(q, true);
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}
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static struct scatterlist *mmc_alloc_sg(int sg_len, gfp_t gfp)
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{
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struct scatterlist *sg;
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sg = kmalloc_array(sg_len, sizeof(*sg), gfp);
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if (sg)
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sg_init_table(sg, sg_len);
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return sg;
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}
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static void mmc_queue_setup_discard(struct request_queue *q,
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struct mmc_card *card)
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{
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unsigned max_discard;
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max_discard = mmc_calc_max_discard(card);
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if (!max_discard)
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return;
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blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
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blk_queue_max_discard_sectors(q, max_discard);
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q->limits.discard_granularity = card->pref_erase << 9;
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/* granularity must not be greater than max. discard */
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if (card->pref_erase > max_discard)
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q->limits.discard_granularity = 0;
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if (mmc_can_secure_erase_trim(card))
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blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);
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}
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/**
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* mmc_init_request() - initialize the MMC-specific per-request data
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* @q: the request queue
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* @req: the request
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* @gfp: memory allocation policy
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*/
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static int __mmc_init_request(struct mmc_queue *mq, struct request *req,
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gfp_t gfp)
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{
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struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
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struct mmc_card *card = mq->card;
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struct mmc_host *host = card->host;
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mq_rq->sg = mmc_alloc_sg(host->max_segs, gfp);
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if (!mq_rq->sg)
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return -ENOMEM;
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return 0;
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}
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static void mmc_exit_request(struct request_queue *q, struct request *req)
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{
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struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
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kfree(mq_rq->sg);
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mq_rq->sg = NULL;
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}
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static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req,
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unsigned int hctx_idx, unsigned int numa_node)
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{
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return __mmc_init_request(set->driver_data, req, GFP_KERNEL);
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}
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static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req,
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unsigned int hctx_idx)
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{
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struct mmc_queue *mq = set->driver_data;
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mmc_exit_request(mq->queue, req);
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}
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/*
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* We use BLK_MQ_F_BLOCKING and have only 1 hardware queue, which means requests
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* will not be dispatched in parallel.
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*/
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static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *bd)
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{
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struct request *req = bd->rq;
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struct request_queue *q = req->q;
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struct mmc_queue *mq = q->queuedata;
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struct mmc_card *card = mq->card;
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struct mmc_host *host = card->host;
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enum mmc_issue_type issue_type;
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enum mmc_issued issued;
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bool get_card, cqe_retune_ok;
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int ret;
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if (mmc_card_removed(mq->card)) {
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req->rq_flags |= RQF_QUIET;
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return BLK_STS_IOERR;
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}
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issue_type = mmc_issue_type(mq, req);
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spin_lock_irq(q->queue_lock);
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if (mq->recovery_needed) {
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spin_unlock_irq(q->queue_lock);
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return BLK_STS_RESOURCE;
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}
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switch (issue_type) {
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case MMC_ISSUE_DCMD:
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if (mmc_cqe_dcmd_busy(mq)) {
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mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
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spin_unlock_irq(q->queue_lock);
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return BLK_STS_RESOURCE;
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}
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break;
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case MMC_ISSUE_ASYNC:
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break;
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default:
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/*
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* Timeouts are handled by mmc core, and we don't have a host
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* API to abort requests, so we can't handle the timeout anyway.
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* However, when the timeout happens, blk_mq_complete_request()
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* no longer works (to stop the request disappearing under us).
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* To avoid racing with that, set a large timeout.
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*/
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req->timeout = 600 * HZ;
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break;
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}
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mq->in_flight[issue_type] += 1;
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get_card = (mmc_tot_in_flight(mq) == 1);
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cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
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spin_unlock_irq(q->queue_lock);
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if (!(req->rq_flags & RQF_DONTPREP)) {
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req_to_mmc_queue_req(req)->retries = 0;
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req->rq_flags |= RQF_DONTPREP;
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}
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if (get_card)
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mmc_get_card(card, &mq->ctx);
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if (mq->use_cqe) {
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host->retune_now = host->need_retune && cqe_retune_ok &&
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!host->hold_retune;
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}
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blk_mq_start_request(req);
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issued = mmc_blk_mq_issue_rq(mq, req);
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switch (issued) {
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case MMC_REQ_BUSY:
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ret = BLK_STS_RESOURCE;
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break;
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case MMC_REQ_FAILED_TO_START:
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ret = BLK_STS_IOERR;
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break;
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default:
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ret = BLK_STS_OK;
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break;
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}
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if (issued != MMC_REQ_STARTED) {
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bool put_card = false;
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spin_lock_irq(q->queue_lock);
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mq->in_flight[issue_type] -= 1;
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if (mmc_tot_in_flight(mq) == 0)
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put_card = true;
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spin_unlock_irq(q->queue_lock);
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if (put_card)
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mmc_put_card(card, &mq->ctx);
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}
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return ret;
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}
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static const struct blk_mq_ops mmc_mq_ops = {
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.queue_rq = mmc_mq_queue_rq,
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.init_request = mmc_mq_init_request,
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.exit_request = mmc_mq_exit_request,
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.complete = mmc_blk_mq_complete,
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.timeout = mmc_mq_timed_out,
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};
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static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
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{
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struct mmc_host *host = card->host;
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u64 limit = BLK_BOUNCE_HIGH;
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if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
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limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
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blk_queue_flag_set(QUEUE_FLAG_NONROT, mq->queue);
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blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, mq->queue);
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if (mmc_can_erase(card))
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mmc_queue_setup_discard(mq->queue, card);
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blk_queue_bounce_limit(mq->queue, limit);
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blk_queue_max_hw_sectors(mq->queue,
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min(host->max_blk_count, host->max_req_size / 512));
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blk_queue_max_segments(mq->queue, host->max_segs);
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blk_queue_max_segment_size(mq->queue, host->max_seg_size);
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INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler);
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INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
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mutex_init(&mq->complete_lock);
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init_waitqueue_head(&mq->wait);
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}
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static int mmc_mq_init_queue(struct mmc_queue *mq, int q_depth,
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const struct blk_mq_ops *mq_ops, spinlock_t *lock)
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{
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int ret;
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memset(&mq->tag_set, 0, sizeof(mq->tag_set));
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mq->tag_set.ops = mq_ops;
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mq->tag_set.queue_depth = q_depth;
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mq->tag_set.numa_node = NUMA_NO_NODE;
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mq->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE |
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BLK_MQ_F_BLOCKING;
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mq->tag_set.nr_hw_queues = 1;
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mq->tag_set.cmd_size = sizeof(struct mmc_queue_req);
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mq->tag_set.driver_data = mq;
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ret = blk_mq_alloc_tag_set(&mq->tag_set);
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if (ret)
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return ret;
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mq->queue = blk_mq_init_queue(&mq->tag_set);
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if (IS_ERR(mq->queue)) {
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ret = PTR_ERR(mq->queue);
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goto free_tag_set;
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}
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mq->queue->queue_lock = lock;
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mq->queue->queuedata = mq;
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return 0;
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free_tag_set:
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blk_mq_free_tag_set(&mq->tag_set);
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return ret;
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}
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/* Set queue depth to get a reasonable value for q->nr_requests */
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#define MMC_QUEUE_DEPTH 64
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static int mmc_mq_init(struct mmc_queue *mq, struct mmc_card *card,
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spinlock_t *lock)
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{
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struct mmc_host *host = card->host;
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int q_depth;
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int ret;
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/*
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* The queue depth for CQE must match the hardware because the request
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* tag is used to index the hardware queue.
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*/
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if (mq->use_cqe)
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q_depth = min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth);
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else
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q_depth = MMC_QUEUE_DEPTH;
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ret = mmc_mq_init_queue(mq, q_depth, &mmc_mq_ops, lock);
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if (ret)
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return ret;
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blk_queue_rq_timeout(mq->queue, 60 * HZ);
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mmc_setup_queue(mq, card);
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return 0;
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}
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/**
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* mmc_init_queue - initialise a queue structure.
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* @mq: mmc queue
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* @card: mmc card to attach this queue
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* @lock: queue lock
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* @subname: partition subname
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*
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* Initialise a MMC card request queue.
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*/
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int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
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spinlock_t *lock, const char *subname)
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{
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struct mmc_host *host = card->host;
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mq->card = card;
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mq->use_cqe = host->cqe_enabled;
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return mmc_mq_init(mq, card, lock);
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}
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void mmc_queue_suspend(struct mmc_queue *mq)
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{
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blk_mq_quiesce_queue(mq->queue);
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/*
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* The host remains claimed while there are outstanding requests, so
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* simply claiming and releasing here ensures there are none.
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*/
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mmc_claim_host(mq->card->host);
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mmc_release_host(mq->card->host);
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}
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void mmc_queue_resume(struct mmc_queue *mq)
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{
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blk_mq_unquiesce_queue(mq->queue);
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}
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void mmc_cleanup_queue(struct mmc_queue *mq)
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{
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struct request_queue *q = mq->queue;
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/*
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* The legacy code handled the possibility of being suspended,
|
|
* so do that here too.
|
|
*/
|
|
if (blk_queue_quiesced(q))
|
|
blk_mq_unquiesce_queue(q);
|
|
|
|
blk_cleanup_queue(q);
|
|
|
|
/*
|
|
* A request can be completed before the next request, potentially
|
|
* leaving a complete_work with nothing to do. Such a work item might
|
|
* still be queued at this point. Flush it.
|
|
*/
|
|
flush_work(&mq->complete_work);
|
|
|
|
mq->card = NULL;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct request *req = mmc_queue_req_to_req(mqrq);
|
|
|
|
return blk_rq_map_sg(mq->queue, req, mqrq->sg);
|
|
}
|