mmc: card: Adding support for sanitize in eMMC 4.5

The sanitize support is added as a user-app ioctl call, and
was removed from the block-device request, since its purpose is
to be invoked not via File-System but by a user.

This feature deletes the unmap memory region of the eMMC card,
by writing to a specific register in the EXT_CSD.

unmap region is the memory region that was previously deleted
(by erase, trim or discard operation).

In order to avoid timeout when sanitizing large-scale cards,
the timeout for sanitize operation is 240 seconds.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 39613b9a6fc5..bd06ff566bfc 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -96,6 +96,8 @@ struct mmc_command {
  */
 
         unsigned int            cmd_timeout_ms; /* in milliseconds */
+        /* Set this flag only for blocking sanitize request */
+        bool                    sanitize_busy;
 
         struct mmc_data         *data;          /* data segment associated with cmd */
         struct mmc_request      *mrq;           /* associated request */
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 38f60a97b218..6f3851533de0 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -280,6 +280,7 @@ struct mmc_host {
 #define MMC_CAP2_PACKED_CMD     (MMC_CAP2_PACKED_RD | \
                                  MMC_CAP2_PACKED_WR)
 #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14)   /* Don't power up before scan */
+#define MMC_CAP2_SANITIZE       (1 << 15)               /* Support Sanitize */
 
         mmc_pm_flag_t           pm_caps;        /* supported pm features */