Re: [PATCH V4 09/11] mmc: block: Add CQE support

Adrian Hunter
2017-08-01T10:14:45Z

On 01/08/17 11:57, Shawn Lin wrote:
> Hi Adrian,
>
> On 2017/7/21 17:49, Adrian Hunter wrote:
>> Add CQE support to the block driver, including:
>> - optionally using DCMD for flush requests
>> - manually issuing discard requests
>> - issuing read / write requests to the CQE
>> - supporting block-layer timeouts
>> - handling recovery
>> - supporting re-tuning
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>> drivers/mmc/core/block.c | 195 ++++++++++++++++++++++++++++++++-
>> drivers/mmc/core/block.h | 7 ++
>> drivers/mmc/core/queue.c | 273
>> ++++++++++++++++++++++++++++++++++++++++++++++-
>> drivers/mmc/core/queue.h | 42 +++++++-
>> 4 files changed, 510 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
>> index 915290c74363..2d25115637b7 100644
>> --- a/drivers/mmc/core/block.c
>> +++ b/drivers/mmc/core/block.c
>> @@ -109,6 +109,7 @@ struct mmc_blk_data {
>> #define MMC_BLK_WRITE BIT(1)
>> #define MMC_BLK_DISCARD BIT(2)
>> #define MMC_BLK_SECDISCARD BIT(3)
>> +#define MMC_BLK_CQE_RECOVERY BIT(4)
>> /*
>> * Only set in main mmc_blk_data associated
>> @@ -1612,6 +1613,198 @@ static void mmc_blk_data_prep(struct mmc_queue
>> *mq, struct mmc_queue_req *mqrq,
>> *do_data_tag_p = do_data_tag;
>> }
>> +#define MMC_CQE_RETRIES 2
>> +
>> +void mmc_blk_cqe_complete_rq(struct request *req)
>> +{
>> + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
>> + struct mmc_request *mrq = &mqrq->brq.mrq;
>> + struct request_queue *q = req->q;
>> + struct mmc_queue *mq = q->queuedata;
>> + struct mmc_host *host = mq->card->host;
>> + unsigned long flags;
>> + bool put_card;
>> + int err;
>> +
>> + mmc_cqe_post_req(host, mrq);
>> +
>> + spin_lock_irqsave(q->queue_lock, flags);
>> +
>> + mq->cqe_in_flight[mmc_cqe_issue_type(host, req)] -= 1;
>> +
>> + put_card = mmc_cqe_tot_in_flight(mq) == 0;
>> +
>> + if (mrq->cmd && mrq->cmd->error)
>> + err = mrq->cmd->error;
>> + else if (mrq->data && mrq->data->error)
>> + err = mrq->data->error;
>> + else
>> + err = 0;
>> +
>> + if (err) {
>> + if (mqrq->retries++ < MMC_CQE_RETRIES)
>> + blk_requeue_request(q, req);
>> + else
>> + __blk_end_request_all(req, BLK_STS_IOERR);
>> + } else if (mrq->data) {
>> + if (__blk_end_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
>> + blk_requeue_request(q, req);
>> + } else {
>> + __blk_end_request_all(req, BLK_STS_OK);
>> + }
>> +
>> + mmc_cqe_kick_queue(mq);
>> +
>> + spin_unlock_irqrestore(q->queue_lock, flags);
>> +
>> + if (put_card)
>> + mmc_put_card(mq->card);
>> +}
>> +
>> +void mmc_blk_cqe_recovery(struct mmc_queue *mq)
>> +{
>> + struct mmc_card *card = mq->card;
>> + struct mmc_host *host = card->host;
>> + int err;
>> +
>> + mmc_get_card(card);
>> +
>> + pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
>> +
>> + mq->cqe_in_recovery = true;
>> +
>> + err = mmc_cqe_recovery(host);
>> + if (err)
>> + mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
>> + else
>> + mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
>> +
>> + mq->cqe_in_recovery = false;
>> +
>> + pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
>> +
>> + mmc_put_card(card);
>> +}
>> +
>> +static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
>> +{
>> + struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
>> + brq.mrq);
>> + struct request *req = mmc_queue_req_to_req(mqrq);
>> + struct request_queue *q = req->q;
>> + struct mmc_queue *mq = q->queuedata;
>> +
>> + /*
>> + * Block layer timeouts race with completions which means the normal
>> + * completion path cannot be used during recovery.
>> + */
>> + if (mq->cqe_in_recovery)
>> + mmc_blk_cqe_complete_rq(req);
>> + else
>> + blk_complete_request(req);
>> +}
>> +
>> +static int mmc_blk_cqe_start_req(struct mmc_host *host, struct
>> mmc_request *mrq)
>> +{
>> + mrq->done = mmc_blk_cqe_req_done;
>> + return mmc_cqe_start_req(host, mrq);
>> +}
>> +
>> +static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
>> + struct request *req)
>> +{
>> + struct mmc_blk_request *brq = &mqrq->brq;
>> +
>> + memset(brq, 0, sizeof(*brq));
>> +
>> + brq->mrq.cmd = &brq->cmd;
>> + brq->mrq.tag = req->tag;
>> +
>> + return &brq->mrq;
>> +}
>> +
>> +static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request
>> *req)
>> +{
>> + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
>> + struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
>> +
>> + mrq->cmd->opcode = MMC_SWITCH;
>> + mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
>> + (EXT_CSD_FLUSH_CACHE << 16) |
>> + (1 << 8) |
>> + EXT_CSD_CMD_SET_NORMAL;
>> + mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
>> +
>> + return mmc_blk_cqe_start_req(mq->card->host, mrq);
>> +}
>> +
>> +static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request
>> *req)
>> +{
>> + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
>> +
>> + mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
>> +
>> + return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
>> +}
>> +
>> +enum mmc_issued mmc_blk_cqe_issue_rq(struct mmc_queue *mq, struct request
>> *req)
>> +{
>> + struct mmc_blk_data *md = mq->blkdata;
>> + struct mmc_card *card = md->queue.card;
>> + struct mmc_host *host = card->host;
>> + int ret;
>> +
>> + ret = mmc_blk_part_switch(card, md);
>> + if (ret)
>> + return MMC_REQ_FAILED_TO_START;
>> +
>> + switch (mmc_cqe_issue_type(host, req)) {
>> + case MMC_ISSUE_SYNC:
>> + ret = host->cqe_ops->cqe_wait_for_idle(host);
>> + if (ret)
>> + return MMC_REQ_BUSY;
>> + switch (req_op(req)) {
>> + case REQ_OP_DRV_IN:
>> + case REQ_OP_DRV_OUT:
>> + mmc_blk_issue_drv_op(mq, req);
>> + break;
>> + case REQ_OP_DISCARD:
>> + mmc_blk_issue_discard_rq(mq, req);
>> + break;
>> + case REQ_OP_SECURE_ERASE:
>> + mmc_blk_issue_secdiscard_rq(mq, req);
>> + break;
>> + case REQ_OP_FLUSH:
>> + mmc_blk_issue_flush(mq, req);
>> + break;
>> + default:
>> + WARN_ON_ONCE(1);
>> + return MMC_REQ_FAILED_TO_START;
>> + }
>> + return MMC_REQ_FINISHED;
>> + case MMC_ISSUE_DCMD:
>> + case MMC_ISSUE_ASYNC:
>> + switch (req_op(req)) {
>> + case REQ_OP_FLUSH:
>> + ret = mmc_blk_cqe_issue_flush(mq, req);
>> + break;
>> + case REQ_OP_READ:
>> + case REQ_OP_WRITE:
>> + ret = mmc_blk_cqe_issue_rw_rq(mq, req);
>> + break;
>> + default:
>> + WARN_ON_ONCE(1);
>> + ret = -EINVAL;
>> + }
>> + if (!ret)
>> + return MMC_REQ_STARTED;
>> + return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
>> + default:
>> + WARN_ON_ONCE(1);
>> + return MMC_REQ_FAILED_TO_START;
>> + }
>> +}
>> +
>> static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
>> struct mmc_card *card,
>> int disable_multi,
>> @@ -2035,7 +2228,7 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct
>> mmc_card *card,
>> INIT_LIST_HEAD(&md->part);
>> md->usage = 1;
>> - ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
>> + ret = mmc_init_queue(&md->queue, card, &md->lock, subname, area_type);
>> if (ret)
>> goto err_putdisk;
>> diff --git a/drivers/mmc/core/block.h b/drivers/mmc/core/block.h
>> index 860ca7c8df86..d7b3d7008b00 100644
>> --- a/drivers/mmc/core/block.h
>> +++ b/drivers/mmc/core/block.h
>> @@ -6,4 +6,11 @@
>> void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req);
>> +enum mmc_issued;
>> +
>> +enum mmc_issued mmc_blk_cqe_issue_rq(struct mmc_queue *mq,
>> + struct request *req);
>> +void mmc_blk_cqe_complete_rq(struct request *rq);
>> +void mmc_blk_cqe_recovery(struct mmc_queue *mq);
>> +
>> #endif
>> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
>> index affa7370ba82..0cb7b0e8ee58 100644
>> --- a/drivers/mmc/core/queue.c
>> +++ b/drivers/mmc/core/queue.c
>> @@ -36,10 +36,254 @@ static int mmc_prep_request(struct request_queue *q,
>> struct request *req)
>> 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, BLK_STS_IOERR);
>> + }
>> + 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)
>> +{
>> + switch (req_op(req)) {
>> + case REQ_OP_DRV_IN:
>> + case REQ_OP_DRV_OUT:
>> + case REQ_OP_DISCARD:
>> + case REQ_OP_SECURE_ERASE:
>> + return MMC_ISSUE_SYNC;
>> + case REQ_OP_FLUSH:
>> + return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC;
>> + default:
>> + 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 = mmc_queue_req_to_req(mqrq);
>> + 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;
>> + }
>> + }
>> +
>
> Just a thought that mmc_cq_thread is a little heavy for manage in-flight
> request, so could we kick the check back to blk layer like this in the
> prepare and unprepare hook?

I am not sure what you are aiming at. The prepare function is called by
blk_peek_request() so the work is anyway being done by the thread. However
the prepare function isn't always called, for example if the request has
already been prepared and then later re-queued. So it looks to me as though
it won't work that way.

>
>
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -25,22 +25,59 @@
>
> #define MMC_QUEUE_BOUNCESZ 65536
>
> +static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq);
> +static inline bool mmc_cqe_can_dcmd(struct mmc_host *host);
> +enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
> + struct request *req);
> +
> /*
> * 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;
> + enum mmc_issue_type issue_type;
>
> if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
> return BLKPREP_KILL;
>
> + if (mq->card->host->cqe_enabled) {
> + issue_type = mmc_cqe_issue_type(mq->card->host, req);
> + if ((issue_type == MMC_ISSUE_DCMD && mmc_cqe_dcmd_busy(mq))) {
> + mq->cqe_busy |= MMC_CQE_DCMD_BUSY;
> + return BLKPREP_DEFER;
> + } else if (issue_type == MMC_ISSUE_ASYNC &&
> + mq->cqe_in_flight[issue_type] >=
> + mq->queue->queue_tags->max_depth) {
> + mq->cqe_busy |= MMC_CQE_QUEUE_FULL;
> + return BLKPREP_DEFER;
> + }
> + }
> +
> req->rq_flags |= RQF_DONTPREP;
> req_to_mmc_queue_req(req)->retries = 0;
>
> return BLKPREP_OK;
> }
>
> +static void mmc_unprep_request(struct request_queue *q, struct request *req)
> +{
> + struct mmc_queue *mq = q->queuedata;
> + enum mmc_issue_type issue_type;
> +
> + if (!mq->card->host->cqe_enabled)
> + return;
> +
> + issue_type = mmc_cqe_issue_type(mq->card->host, req);
> + if (issue_type == MMC_ISSUE_DCMD &&
> + (mq->cqe_busy & MMC_CQE_DCMD_BUSY) &&
> + !mmc_cqe_dcmd_busy(mq))
> + mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;
> + else if (issue_type == MMC_ISSUE_ASYNC)
> + mq->cqe_busy &= ~MMC_CQE_QUEUE_FULL;
> +}
> +
> +
> static void mmc_cqe_request_fn(struct request_queue *q)
> {
> struct mmc_queue *mq = q->queuedata;
> @@ -66,11 +103,6 @@ static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq)
>
> 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);
> }
> @@ -151,21 +183,9 @@ static int mmc_cqe_thread(void *d)
>
> 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:
> + if (issue_type == MMC_ISSUE_DCMD || issue_type ==
> MMC_ISSUE_ASYNC) {
> + blk_queue_start_tag(q, req);
> + } else {
> /*
> * Timeouts are handled by mmc core, so set a
> * large value to avoid races.
> @@ -174,13 +194,12 @@ static int mmc_cqe_thread(void *d)
> 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->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;
> @@ -523,6 +542,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card
> *card,
> }
>
> blk_queue_prep_rq(mq->queue, mmc_prep_request);
> + blk_queue_unprep_rq(mq->queue, mmc_unprep_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))
>
>
>
>> + 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, BLK_STS_IOERR);
>> + /* 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;
>> @@ -233,11 +477,12 @@ static void mmc_exit_request(struct request_queue
>> *q, struct request *req)
>> * Initialise a MMC card request queue.
>> */
>> int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
>> - spinlock_t *lock, const char *subname)
>> + 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;
>> @@ -247,7 +492,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct
>> mmc_card *card,
>> if (!mq->queue)
>> return -ENOMEM;
>> mq->queue->queue_lock = lock;
>> - mq->queue->request_fn = mmc_request_fn;
>> + 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);
>> @@ -259,6 +504,24 @@ int mmc_init_queue(struct mmc_queue *mq, struct
>> mmc_card *card,
>> 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);
>> @@ -280,9 +543,9 @@ int mmc_init_queue(struct mmc_queue *mq, struct
>> mmc_card *card,
>> sema_init(&mq->thread_sem, 1);
>> - mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
>> - host->index, subname ? subname : "");
>> -
>> + 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;
>> diff --git a/drivers/mmc/core/queue.h b/drivers/mmc/core/queue.h
>> index 361b46408e0f..8e9273d977c0 100644
>> --- a/drivers/mmc/core/queue.h
>> +++ b/drivers/mmc/core/queue.h
>> @@ -7,6 +7,20 @@
>> #include <linux/mmc/core.h>
>> #include <linux/mmc/host.h>
>> +enum mmc_issued {
>> + MMC_REQ_STARTED,
>> + MMC_REQ_BUSY,
>> + MMC_REQ_FAILED_TO_START,
>> + MMC_REQ_FINISHED,
>> +};
>> +
>> +enum mmc_issue_type {
>> + MMC_ISSUE_SYNC,
>> + MMC_ISSUE_DCMD,
>> + MMC_ISSUE_ASYNC,
>> + MMC_ISSUE_MAX,
>> +};
>> +
>> static inline struct mmc_queue_req *req_to_mmc_queue_req(struct request
>> *rq)
>> {
>> return blk_mq_rq_to_pdu(rq);
>> @@ -53,6 +67,7 @@ struct mmc_queue_req {
>> int drv_op_result;
>> struct mmc_blk_ioc_data **idata;
>> unsigned int ioc_count;
>> + int retries;
>> };
>> struct mmc_queue {
>> @@ -70,10 +85,17 @@ struct mmc_queue {
>> * associated mmc_queue_req data.
>> */
>> int qcnt;
>> + /* Following are defined for a Command Queue Engine */
>> + int cqe_in_flight[MMC_ISSUE_MAX];
>> + unsigned int cqe_busy;
>> + bool cqe_recovery_needed;
>> + bool cqe_in_recovery;
>> +#define MMC_CQE_DCMD_BUSY BIT(0)
>> +#define MMC_CQE_QUEUE_FULL BIT(1)
>> };
>> extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *,
>> spinlock_t *,
>> - const char *);
>> + const char *, int);
>> extern void mmc_cleanup_queue(struct mmc_queue *);
>> extern void mmc_queue_suspend(struct mmc_queue *);
>> extern void mmc_queue_resume(struct mmc_queue *);
>> @@ -85,4 +107,22 @@ extern unsigned int mmc_queue_map_sg(struct mmc_queue *,
>> extern int mmc_access_rpmb(struct mmc_queue *);
>> +void mmc_cqe_kick_queue(struct mmc_queue *mq);
>> +
>> +enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host,
>> + struct request *req);
>> +
>> +static inline int mmc_cqe_tot_in_flight(struct mmc_queue *mq)
>> +{
>> + return mq->cqe_in_flight[MMC_ISSUE_SYNC] +
>> + mq->cqe_in_flight[MMC_ISSUE_DCMD] +
>> + mq->cqe_in_flight[MMC_ISSUE_ASYNC];
>> +}
>> +
>> +static inline int mmc_cqe_qcnt(struct mmc_queue *mq)
>> +{
>> + return mq->cqe_in_flight[MMC_ISSUE_DCMD] +
>> + mq->cqe_in_flight[MMC_ISSUE_ASYNC];
>> +}
>> +
>> #endif
>>
>
>