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>

5 files changed, 20 insertions, 2 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 049445eb4f74..e85816e1634a 100644
--- 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 fed290ecc242..dcad59cbfef1 100644
--- 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 a3c4e0fe9434..d9836e5a4e59 100644
--- 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 56e5625b6f41..9585835cbc42 100644
--- 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 02e9e3de9609..8a05a21fc7c3 100644
--- 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 */