On Thu, 3 Aug 2023 at 07:46, Wenchao Chen <wenchao.chen@xxxxxxxxxx> wrote:
>
> Hsq is similar to cqe, using hsq->depth to represent
> the maximum processing capacity of hsq. We can adjust
> hsq->depth according to the actual situation.
Sorry, but I don't quite follow here.
Are you planning to update the host->hsq_depth dynamically from somewhere?
Kind regards
Uffe
>
> Signed-off-by: Wenchao Chen <wenchao.chen@xxxxxxxxxx>
> ---
> drivers/mmc/core/queue.c | 6 +-----
> drivers/mmc/host/mmc_hsq.c | 1 +
> drivers/mmc/host/mmc_hsq.h | 7 +++++++
> include/linux/mmc/host.h | 1 +
> 4 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
> index b396e3900717..a0a2412f62a7 100644
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -260,11 +260,7 @@ static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
> }
> break;
> case MMC_ISSUE_ASYNC:
> - /*
> - * For MMC host software queue, we only allow 2 requests in
> - * flight to avoid a long latency.
> - */
> - if (host->hsq_enabled && mq->in_flight[issue_type] > 2) {
> + if (host->hsq_enabled && mq->in_flight[issue_type] > host->hsq_depth) {
> spin_unlock_irq(&mq->lock);
> return BLK_STS_RESOURCE;
> }
> diff --git a/drivers/mmc/host/mmc_hsq.c b/drivers/mmc/host/mmc_hsq.c
> index 424dc7b07858..7b3952721c17 100644
> --- a/drivers/mmc/host/mmc_hsq.c
> +++ b/drivers/mmc/host/mmc_hsq.c
> @@ -337,6 +337,7 @@ int mmc_hsq_init(struct mmc_hsq *hsq, struct mmc_host *mmc)
> hsq->mmc = mmc;
> hsq->mmc->cqe_private = hsq;
> mmc->cqe_ops = &mmc_hsq_ops;
> + mmc->hsq_depth = HSQ_MAX_DEPTH;
>
> for (i = 0; i < HSQ_NUM_SLOTS; i++)
> hsq->tag_slot[i] = HSQ_INVALID_TAG;
> diff --git a/drivers/mmc/host/mmc_hsq.h b/drivers/mmc/host/mmc_hsq.h
> index 1808024fc6c5..795f6b9421d7 100644
> --- a/drivers/mmc/host/mmc_hsq.h
> +++ b/drivers/mmc/host/mmc_hsq.h
> @@ -5,6 +5,13 @@
> #define HSQ_NUM_SLOTS 64
> #define HSQ_INVALID_TAG HSQ_NUM_SLOTS
>
> +/*
> + * For MMC host software queue, we usually allow 2 requests in
> + * flight to avoid a long latency. But we can adjust hsq->depth
> + * according to the actual situation.
> + */
> +#define HSQ_MAX_DEPTH 2
> +
> struct hsq_slot {
> struct mmc_request *mrq;
> };
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 461d1543893b..1fd8b1dd8698 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -520,6 +520,7 @@ struct mmc_host {
>
> /* Host Software Queue support */
> bool hsq_enabled;
> + int hsq_depth;
>
> u32 err_stats[MMC_ERR_MAX];
> unsigned long private[] ____cacheline_aligned;
> --
> 2.17.1
>
