BACKPORT: mmc: core: Export device lifetime information through sysfs

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.

Signed-off-by: Jungseung Lee <js07.lee@samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 79a0c26..0e3d715 100644 (file)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -592,6 +592,12 @@ 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];
        }
 out:
        return err;
@@ -721,6 +727,10 @@ 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);
@@ -757,6 +767,8 @@ 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 eb0151b..8f23fb2 100644 (file)
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -118,6 +118,9 @@ 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 15f2c4a..2c6b1d4 100644 (file)
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -330,6 +330,9 @@ 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_SUPPORTED_MODE         493     /* RO */
 #define EXT_CSD_TAG_UNIT_SIZE          498     /* RO */
 #define EXT_CSD_DATA_TAG_SUPPORT       499     /* RO */