Re: [PATCH V14 17/24] mmc: block: blk-mq: Add support for direct completion

Ulf Hansson
2017-11-28T19:02:01Z

[...]

>
> diff --git a/drivers/mmc/core/queue.h b/drivers/mmc/core/queue.h
> index 1d7d3b0afff8..c4271fa54f1a 100644
> --- a/drivers/mmc/core/queue.h
> +++ b/drivers/mmc/core/queue.h
> @@ -103,6 +103,7 @@ struct mmc_queue {
> bool waiting;
> struct work_struct recovery_work;
> wait_queue_head_t wait;
> + struct request *recovery_req;
> struct request *complete_req;
> struct mutex complete_lock;
> struct work_struct complete_work;
> @@ -134,4 +135,9 @@ static inline int mmc_cqe_qcnt(struct mmc_queue *mq)
> mq->in_flight[MMC_ISSUE_ASYNC];
> }
>
> +static inline bool mmc_queue_direct_complete(struct mmc_host *host)

Nitpick 1) I would like to make it clear that this is a feature, which
depends on the behavior of the mmc host. Thus, I suggest renaming the
function to something along the lines of mmc_host_*()

Nitpick 2) There is system-wide PM core feature already "reserved" the
"direct_complete" terminology. To avoid mixing them up (terminology
wise), may I suggest renaming the mmc cap to MMC_CAP_DONE_COMPLETE,
thus perhaps the function above to mmc_host_done_complete(). Or if you
find a better option. :-)

> +{
> + return host->caps & MMC_CAP_DIRECT_COMPLETE;
> +}
> +
> #endif
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index ce2075d6f429..4b68a95a8818 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -324,6 +324,7 @@ struct mmc_host {
> #define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */
> #define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */
> #define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */
> +#define MMC_CAP_DIRECT_COMPLETE (1 << 27) /* RW reqs can be completed within mmc_request_done() */
> #define MMC_CAP_CD_WAKE (1 << 28) /* Enable card detect wake */
> #define MMC_CAP_CMD_DURING_TFR (1 << 29) /* Commands during data transfer */
> #define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */
> --
> 1.9.1
>

Besides the nitpicks, this looks good to me!

Kind regards
Uffe