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From: Oleksij Rempel <o.rempel@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Subject: [PATCH v7 5/7] crypto: caam - fix RNG buffer cache alignment
Date: Wed, 22 Mar 2017 09:43:04 +0100	[thread overview]
Message-ID: <20170322084306.16726-6-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20170322084306.16726-1-o.rempel@pengutronix.de>

this is alternate version of linux fix:
---------------------------------------------------------------------
| commit 412c98c1bef65fe7589f1300e93735d96130307c
| Author: Steve Cornelius <steve.cornelius@freescale.com>
| Date:   Mon Jun 15 16:52:59 2015 -0700
|
| crypto: caam - fix RNG buffer cache alignment
|
| The hwrng output buffers (2) are cast inside of a a struct (caam_rng_ctx)
| allocated in one DMA-tagged region. While the kernel's heap allocator
| should place the overall struct on a cacheline aligned boundary, the 2
| buffers contained within may not necessarily align. Consenquently, the
| ends of unaligned buffers may not fully flush, and if so, stale data will be
| left behind, resulting in small repeating patterns.
|
| This fix aligns the buffers inside the struct.
|
| Note that not all of the data inside caam_rng_ctx necessarily needs to
| be DMA-tagged, only the buffers themselves require this. However, a fix
| would incur the expense of error-handling bloat in the case of allocation
| failure.
|
| Cc: stable@vger.kernel.org
| Signed-off-by: Steve Cornelius <steve.cornelius@freescale.com>
| Signed-off-by: Victoria Milhoan <vicki.milhoan@freescale.com>
| Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---------------------------------------------------------------------

instead we will use just dma_alloc()

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/crypto/caam/caamrng.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index aabad0416..31a92731d 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -55,7 +55,7 @@
 
 /* Buffer, its dma address and lock */
 struct buf_data {
-	u8 buf[RN_BUF_SIZE];
+	u8 *buf;
 	dma_addr_t addr;
 	u32 hw_desc[DESC_JOB_O_LEN];
 #define BUF_NOT_EMPTY 0
@@ -218,6 +218,8 @@ static int caam_init_buf(struct caam_rng_ctx *ctx, int buf_id)
 	struct buf_data *bd = &ctx->bufs[buf_id];
 	int err;
 
+	bd->buf = dma_alloc(RN_BUF_SIZE);
+
 	err = rng_create_job_desc(ctx, buf_id);
 	if (err)
 		return err;
-- 
2.11.0


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  parent reply	other threads:[~2017-03-22  8:43 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-22  8:42 [PATCH v7 0/7] upstream hwrng framework Oleksij Rempel
2017-03-22  8:43 ` [PATCH v7 1/7] drivers: add simple hw_random implementation Oleksij Rempel
2017-03-22  8:43 ` [PATCH v7 2/7] lib: random: add get_crypto_bytes interface and use HWRNG if posssible Oleksij Rempel
2017-03-22  8:43 ` [PATCH v7 3/7] caamrng: port to hwrng framework Oleksij Rempel
2017-03-22  8:43 ` [PATCH v7 4/7] fs: add prng device Oleksij Rempel
2017-03-22  8:43 ` Oleksij Rempel [this message]
2017-03-22  8:43 ` [PATCH v7 6/7] common: password: make use of get_crypto_bytes Oleksij Rempel
2017-03-22  8:43 ` [PATCH v7 7/7] add seed command Oleksij Rempel

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