mmc: core: mmc sanitize feature support for v4.5

In the v4.5, there's no secure erase & trim support.
Instead it supports the sanitize feature.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 049445e..e85816e 100644 (file)
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -792,11 +792,18 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
        unsigned int from, nr, arg;
        int err = 0, type = MMC_BLK_SECDISCARD;
 
-       if (!mmc_can_secure_erase_trim(card)) {
+       if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
                err = -EOPNOTSUPP;
                goto out;
        }
 
+       /* The sanitize operation is supported at v4.5 only */
+       if (mmc_can_sanitize(card)) {
+               err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+                               EXT_CSD_SANITIZE_START, 1, 0);
+               goto out;
+       }
+
        from = blk_rq_pos(req);
        nr = blk_rq_sectors(req);
 

diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index fed290e..dcad59c 100644 (file)
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -140,7 +140,7 @@ static void mmc_queue_setup_discard(struct request_queue *q,
        /* granularity must not be greater than max. discard */
        if (card->pref_erase > max_discard)
                q->limits.discard_granularity = 0;
-       if (mmc_can_secure_erase_trim(card))
+       if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
                queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
 }
 

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index a3c4e0f..d9836e5 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1713,6 +1713,14 @@ int mmc_can_trim(struct mmc_card *card)
 }
 EXPORT_SYMBOL(mmc_can_trim);
 
+int mmc_can_sanitize(struct mmc_card *card)
+{
+       if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
+               return 1;
+       return 0;
+}
+EXPORT_SYMBOL(mmc_can_sanitize);
+
 int mmc_can_secure_erase_trim(struct mmc_card *card)
 {
        if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 56e5625..9585835 100644 (file)
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -156,6 +156,7 @@ extern int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
                     unsigned int arg);
 extern int mmc_can_erase(struct mmc_card *card);
 extern int mmc_can_trim(struct mmc_card *card);
+extern int mmc_can_sanitize(struct mmc_card *card);
 extern int mmc_can_secure_erase_trim(struct mmc_card *card);
 extern int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
                                   unsigned int nr);

diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 02e9e3d..8a05a21 100644 (file)
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -275,6 +275,7 @@ struct _mmc_csd {
 #define EXT_CSD_PARTITION_ATTRIBUTE    156     /* R/W */
 #define EXT_CSD_PARTITION_SUPPORT      160     /* RO */
 #define EXT_CSD_RST_N_FUNCTION         162     /* R/W */
+#define EXT_CSD_SANITIZE_START         165     /* W */
 #define EXT_CSD_WR_REL_PARAM           166     /* RO */
 #define EXT_CSD_ERASE_GROUP_DEF                175     /* R/W */
 #define EXT_CSD_PART_CONFIG            179     /* R/W */
@@ -343,6 +344,7 @@ struct _mmc_csd {
 #define EXT_CSD_SEC_ER_EN      BIT(0)
 #define EXT_CSD_SEC_BD_BLK_EN  BIT(2)
 #define EXT_CSD_SEC_GB_CL_EN   BIT(4)
+#define EXT_CSD_SEC_SANITIZE   BIT(6)  /* v4.5 only */
 
 #define EXT_CSD_RST_N_EN_MASK  0x3
 #define EXT_CSD_RST_N_ENABLED  1       /* RST_n is enabled on card */