linux-kernel - Re: [PATCH v2] mmc: core: Export device lifetime information through sysf

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Date:   Tue, 13 Dec 2016 09:18:28 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Jungseung Lee <js07.lee@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        js07.lee@...il.com
Cc:     shawn.lin@...k-chips.com
Subject: Re: [PATCH v2] mmc: core: Export device lifetime information through
 sysf

On 2016/12/9 13:53, Jungseung Lee wrote:
> In the eMMC 5.0 version of the spec, several EXT_CSD fields about
> device lifetime are added.
>
>  - Two types of estimated indications reflected by averaged wear out of memory
>  - An indication reflected by average reserved blocks
>
> Export the information through sysfs.
>

Looks good,

Reviewed-by: Shawn Lin <shawn.lin@...k-chips.com>

> Signed-off-by: Jungseung Lee <js07.lee@...sung.com>
> ---
>  drivers/mmc/core/mmc.c   | 12 ++++++++++++
>  include/linux/mmc/card.h |  3 +++
>  include/linux/mmc/mmc.h  |  3 +++
>  3 files changed, 18 insertions(+)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index b61b52f9..c0e2507 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -617,6 +617,12 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
>  		card->ext_csd.ffu_capable =
>  			(ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
>  			!(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
> +
> +		card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO];
> +		card->ext_csd.device_life_time_est_typ_a =
> +			ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A];
> +		card->ext_csd.device_life_time_est_typ_b =
> +			ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B];
>  	}
>
>  	/* eMMC v5.1 or later */
> @@ -764,6 +770,10 @@ MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
>  MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
>  MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
>  MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
> +MMC_DEV_ATTR(pre_eol_info, "%02x\n", card->ext_csd.pre_eol_info);
> +MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
> +	card->ext_csd.device_life_time_est_typ_a,
> +	card->ext_csd.device_life_time_est_typ_b);
>  MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
>  MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
>  		card->ext_csd.enhanced_area_offset);
> @@ -817,6 +827,8 @@ static struct attribute *mmc_std_attrs[] = {
>  	&dev_attr_name.attr,
>  	&dev_attr_oemid.attr,
>  	&dev_attr_prv.attr,
> +	&dev_attr_pre_eol_info.attr,
> +	&dev_attr_life_time.attr,
>  	&dev_attr_serial.attr,
>  	&dev_attr_enhanced_area_offset.attr,
>  	&dev_attr_enhanced_area_size.attr,
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 95d69d4..00449e5 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -121,6 +121,9 @@ struct mmc_ext_csd {
>  	u8			raw_pwr_cl_ddr_200_360;	/* 253 */
>  	u8			raw_bkops_status;	/* 246 */
>  	u8			raw_sectors[4];		/* 212 - 4 bytes */
> +	u8			pre_eol_info;		/* 267 */
> +	u8			device_life_time_est_typ_a;	/* 268 */
> +	u8			device_life_time_est_typ_b;	/* 269 */
>
>  	unsigned int            feature_support;
>  #define MMC_DISCARD_FEATURE	BIT(0)                  /* CMD38 feature */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 672730a..a074082 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -339,6 +339,9 @@ struct _mmc_csd {
>  #define EXT_CSD_CACHE_SIZE		249	/* RO, 4 bytes */
>  #define EXT_CSD_PWR_CL_DDR_200_360	253	/* RO */
>  #define EXT_CSD_FIRMWARE_VERSION	254	/* RO, 8 bytes */
> +#define EXT_CSD_PRE_EOL_INFO		267	/* RO */
> +#define EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A	268	/* RO */
> +#define EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B	269	/* RO */
>  #define EXT_CSD_CMDQ_DEPTH		307	/* RO */
>  #define EXT_CSD_CMDQ_SUPPORT		308	/* RO */
>  #define EXT_CSD_SUPPORTED_MODE		493	/* RO */
>


-- 
Best Regards
Shawn Lin