From 4980454868af4b2f84f1f15f4b76512eecb37e1d Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@nokia.com>
Date: Wed, 11 Aug 2010 14:17:50 -0700
Subject: [PATCH] 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>
---
drivers/mmc/card/block.c | 46 +++++++++++++++++++++++++++++++++++++---
drivers/mmc/card/queue.c | 3 +++
2 files changed, 46 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 03f96e975fe55..d545f79f6000e 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -280,6 +280,42 @@ static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
return err ? 0 : 1;
}
+static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
+ struct request *req)
+{
+ struct mmc_blk_data *md = mq->data;
+ struct mmc_card *card = md->queue.card;
+ unsigned int from, nr, arg;
+ int err = 0;
+
+ mmc_claim_host(card->host);
+
+ if (!mmc_can_secure_erase_trim(card)) {
+ err = -EOPNOTSUPP;
+ goto out;
+ }
+
+ from = blk_rq_pos(req);
+ nr = blk_rq_sectors(req);
+
+ if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
+ arg = MMC_SECURE_TRIM1_ARG;
+ else
+ arg = MMC_SECURE_ERASE_ARG;
+
+ err = mmc_erase(card, from, nr, arg);
+ if (!err && arg == MMC_SECURE_TRIM1_ARG)
+ err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
+out:
+ spin_lock_irq(&md->lock);
+ __blk_end_request(req, err, blk_rq_bytes(req));
+ spin_unlock_irq(&md->lock);
+
+ mmc_release_host(card->host);
+
+ return err ? 0 : 1;
+}
+
static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
{
struct mmc_blk_data *md = mq->data;
@@ -510,10 +546,14 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
{
- if (req->cmd_flags & REQ_DISCARD)
- return mmc_blk_issue_discard_rq(mq, req);
- else
+ if (req->cmd_flags & REQ_DISCARD) {
+ if (req->cmd_flags & REQ_SECURE)
+ return mmc_blk_issue_secdiscard_rq(mq, req);
+ else
+ return mmc_blk_issue_discard_rq(mq, req);
+ } else {
return mmc_blk_issue_rw_rq(mq, req);
+ }
}
static inline int mmc_blk_readonly(struct mmc_card *card)
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 3b15884e435ce..e876678176be1 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
--
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