linux-kernel - Re: [PATCH v1] mmc: block: Disable CMDQ on the ioctl path

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Date:   Tue, 11 May 2021 12:56:37 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Bean Huo <huobean@...il.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bean Huo <beanhuo@...ron.com>,
        Michael Brunner <Michael.Brunner@...tron.com>
Subject: Re: [PATCH v1] mmc: block: Disable CMDQ on the ioctl path

On Tue, 4 May 2021 at 22:32, Bean Huo <huobean@...il.com> wrote:
>
> From: Bean Huo <beanhuo@...ron.com>
>
> According to the eMMC Spec:
> "When command queuing is enabled (CMDQ Mode En bit in CMDQ_MODE_EN
> field is set to ‘1’) class 11 commands are the only method through
> which data transfer tasks can be issued. Existing data transfer
> commands, namely CMD18/CMD17 and CMD25/CMD24, are not supported when
> command queuing is enabled."
> which means if CMDQ is enabled, the FFU commands will not be supported.
> To fix this issue, just simply disable CMDQ on the ioctl path, and
> re-enable CMDQ once ioctl request is completed.
>
> Tested-by: Michael Brunner <Michael.Brunner@...tron.com>
> Signed-off-by: Bean Huo <beanhuo@...ron.com>

Applied for next and by adding a fixes/stable tag, thanks!

Kind regards
Uffe

> ---
>  drivers/mmc/core/block.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 689eb9afeeed..21fb99883b1e 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1004,6 +1004,11 @@ static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
>
>         switch (mq_rq->drv_op) {
>         case MMC_DRV_OP_IOCTL:
> +               if (card->ext_csd.cmdq_en) {
> +                       ret = mmc_cmdq_disable(card);
> +                       if (ret)
> +                               break;
> +               }

This should have a "fallthrough;" statement. No need for a respin, I
have amended the change this time.

>         case MMC_DRV_OP_IOCTL_RPMB:
>                 idata = mq_rq->drv_op_data;
>                 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
> @@ -1014,6 +1019,8 @@ static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
>                 /* Always switch back to main area after RPMB access */
>                 if (rpmb_ioctl)
>                         mmc_blk_part_switch(card, 0);
> +               else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
> +                       mmc_cmdq_enable(card);
>                 break;
>         case MMC_DRV_OP_BOOT_WP:
>                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
> --
> 2.25.1
>

Kind regards
Uffe