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authorVictoria Milhoan <vicki.milhoan@freescale.com>2015-08-05 11:28:35 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2015-08-10 23:18:55 +0800
commite7472422392461f59bc5d7ddd8542c6a48740336 (patch)
tree778c4747bed011ecd99592dc5068cd8b20673a4f /drivers/crypto/caam
parentbf20d772174bbb6b1a7c0b34f04f51caebe2d6aa (diff)
downloadlinux-e7472422392461f59bc5d7ddd8542c6a48740336.tar.bz2
crypto: caam - Add cache coherency support
Freescale i.MX6 ARM platforms do not support hardware cache coherency. This patch adds cache coherency support to the CAAM driver. Signed-off-by: Victoria Milhoan <vicki.milhoan@freescale.com> Tested-by: Horia Geantă <horia.geanta@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/caam')
-rw-r--r--drivers/crypto/caam/caamhash.c2
-rw-r--r--drivers/crypto/caam/caamrng.c4
-rw-r--r--drivers/crypto/caam/jr.c18
3 files changed, 23 insertions, 1 deletions
diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index dae1e8099969..9622a81f4336 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -127,7 +127,7 @@ struct caam_hash_state {
int buflen_0;
u8 buf_1[CAAM_MAX_HASH_BLOCK_SIZE] ____cacheline_aligned;
int buflen_1;
- u8 caam_ctx[MAX_CTX_LEN];
+ u8 caam_ctx[MAX_CTX_LEN] ____cacheline_aligned;
int (*update)(struct ahash_request *req);
int (*final)(struct ahash_request *req);
int (*finup)(struct ahash_request *req);
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 5095337205b8..a1d21d5fb2ff 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -108,6 +108,10 @@ static void rng_done(struct device *jrdev, u32 *desc, u32 err, void *context)
atomic_set(&bd->empty, BUF_NOT_EMPTY);
complete(&bd->filled);
+
+ /* Buffer refilled, invalidate cache */
+ dma_sync_single_for_cpu(jrdev, bd->addr, RN_BUF_SIZE, DMA_FROM_DEVICE);
+
#ifdef DEBUG
print_hex_dump(KERN_ERR, "rng refreshed buf@: ",
DUMP_PREFIX_ADDRESS, 16, 4, bd->buf, RN_BUF_SIZE, 1);
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index b8b5d47acd7a..b7ec1ad38841 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -202,6 +202,13 @@ static void caam_jr_dequeue(unsigned long devarg)
userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
userstatus = jrp->outring[hw_idx].jrstatus;
+ /*
+ * Make sure all information from the job has been obtained
+ * before telling CAAM that the job has been removed from the
+ * output ring.
+ */
+ mb();
+
/* set done */
wr_reg32(&jrp->rregs->outring_rmvd, 1);
@@ -351,12 +358,23 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
jrp->inpring[jrp->inp_ring_write_index] = desc_dma;
+ /*
+ * Guarantee that the descriptor's DMA address has been written to
+ * the next slot in the ring before the write index is updated, since
+ * other cores may update this index independently.
+ */
smp_wmb();
jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) &
(JOBR_DEPTH - 1);
jrp->head = (head + 1) & (JOBR_DEPTH - 1);
+ /*
+ * Ensure that all job information has been written before
+ * notifying CAAM that a new job was added to the input ring.
+ */
+ wmb();
+
wr_reg32(&jrp->rregs->inpring_jobadd, 1);
spin_unlock_bh(&jrp->inplock);