mmc_block: add support for secure discard

Secure discard is implemented by Secure Trim if the discard is unaligned
or Secure Erase otherwise.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Cc: Kyungmin Park <kmpark@infradead.org>
Cc: Madhusudhan Chikkature <madhu.cr@ti.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ben Gardiner <bengardiner@nanometrics.ca>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 3b15884e435..e876678176b 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -141,6 +141,9 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
                         mq->queue->limits.discard_alignment =
                                                         card->erase_size << 9;
                 }
+                if (mmc_can_secure_erase_trim(card))
+                        queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD,
+                                                mq->queue);
         }
 
 #ifdef CONFIG_MMC_BLOCK_BOUNCE