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Date: Wed, 6 Feb 2019 16:14:36 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Avri Altman <avri.altman@....com>
Cc: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Jaehoon Chung <jh80.chung@...sung.com>,
Shawn Lin <shawn.lin@...k-chips.com>,
Avi Shchislowski <avi.shchislowski@....com>,
Alex Lemberg <alex.lemberg@....com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] mmc: core: Calculate the discard arg only once
On Wed, 6 Feb 2019 at 12:28, Avri Altman <avri.altman@....com> wrote:
>
> In MMC, the discard arg is a read-only ext_csd parameter - set it once
> on card init. To be consistent, do that for SD as well even though its
> discard arg is always 0x0.
>
> Signed-off-by: Avri Altman <avri.altman@....com>
Applied for next, thanks!
Kind regards
Uffe
> ---
> drivers/mmc/core/block.c | 12 +++---------
> drivers/mmc/core/core.c | 4 ++--
> drivers/mmc/core/mmc.c | 8 ++++++++
> drivers/mmc/core/sd.c | 2 ++
> include/linux/mmc/card.h | 1 +
> include/linux/mmc/sd.h | 5 +++++
> 6 files changed, 21 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index b08fb91..131e80e 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1124,7 +1124,7 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
> {
> struct mmc_blk_data *md = mq->blkdata;
> struct mmc_card *card = md->queue.card;
> - unsigned int from, nr, arg;
> + unsigned int from, nr;
> int err = 0, type = MMC_BLK_DISCARD;
> blk_status_t status = BLK_STS_OK;
>
> @@ -1136,24 +1136,18 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
> from = blk_rq_pos(req);
> nr = blk_rq_sectors(req);
>
> - if (mmc_can_discard(card))
> - arg = MMC_DISCARD_ARG;
> - else if (mmc_can_trim(card))
> - arg = MMC_TRIM_ARG;
> - else
> - arg = MMC_ERASE_ARG;
> do {
> err = 0;
> if (card->quirks & MMC_QUIRK_INAND_CMD38) {
> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> INAND_CMD38_ARG_EXT_CSD,
> - arg == MMC_TRIM_ARG ?
> + card->erase_arg == MMC_TRIM_ARG ?
> INAND_CMD38_ARG_TRIM :
> INAND_CMD38_ARG_ERASE,
> 0);
> }
> if (!err)
> - err = mmc_erase(card, from, nr, arg);
> + err = mmc_erase(card, from, nr, card->erase_arg);
> } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
> if (err)
> status = BLK_STS_IOERR;
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 5bd58b9..de0f1a1 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2164,7 +2164,7 @@ static unsigned int mmc_align_erase_size(struct mmc_card *card,
> * @card: card to erase
> * @from: first sector to erase
> * @nr: number of sectors to erase
> - * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
> + * @arg: erase command argument (SD supports only %SD_ERASE_ARG)
> *
> * Caller must claim host before calling this function.
> */
> @@ -2181,7 +2181,7 @@ int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
> if (!card->erase_size)
> return -EOPNOTSUPP;
>
> - if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
> + if (mmc_card_sd(card) && arg != SD_ERASE_ARG)
> return -EOPNOTSUPP;
>
> if ((arg & MMC_SECURE_ARGS) &&
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index da892a5..09c688f 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1743,6 +1743,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
> }
>
> + /* set erase_arg */
> + if (mmc_can_discard(card))
> + card->erase_arg = MMC_DISCARD_ARG;
> + else if (mmc_can_trim(card))
> + card->erase_arg = MMC_TRIM_ARG;
> + else
> + card->erase_arg = MMC_ERASE_ARG;
> +
> /*
> * Select timing interface
> */
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index d0d9f90..bd48b28 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -271,6 +271,8 @@ static int mmc_read_ssr(struct mmc_card *card)
> }
> }
>
> + card->erase_arg = SD_ERASE_ARG;
> +
> return 0;
> }
>
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index de73778..8f429b6 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -277,6 +277,7 @@ struct mmc_card {
> unsigned int erase_shift; /* if erase unit is power 2 */
> unsigned int pref_erase; /* in sectors */
> unsigned int eg_boundary; /* don't cross erase-group boundaries */
> + unsigned int erase_arg; /* erase / trim / discard */
> u8 erased_byte; /* value of erased bytes */
>
> u32 raw_cid[4]; /* raw card CID */
> diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h
> index 1ebcf9b..1a6d10f 100644
> --- a/include/linux/mmc/sd.h
> +++ b/include/linux/mmc/sd.h
> @@ -91,4 +91,9 @@
> #define SD_SWITCH_ACCESS_DEF 0
> #define SD_SWITCH_ACCESS_HS 1
>
> +/*
> + * Erase/discard
> + */
> +#define SD_ERASE_ARG 0x00000000
> +
> #endif /* LINUX_MMC_SD_H */
> --
> 1.9.1
>
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