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Subject[PATCH v2 06/27] staging: ccree: copy larval digest from RAM
Date
The ccree driver was using a DMA operation to copy larval digest
from the ccree SRAM to RAM. Replace it with a simple memcpy.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
drivers/staging/ccree/ssi_driver.c | 2 +
drivers/staging/ccree/ssi_hash.c | 121 ++++++++++++++++++++-----------------
drivers/staging/ccree/ssi_hash.h | 2 +
3 files changed, 68 insertions(+), 57 deletions(-)

diff --git a/drivers/staging/ccree/ssi_driver.c b/drivers/staging/ccree/ssi_driver.c
index 9b4c064..64db0c1 100644
--- a/drivers/staging/ccree/ssi_driver.c
+++ b/drivers/staging/ccree/ssi_driver.c
@@ -484,6 +484,8 @@ static int __init ccree_init(void)
{
int ret;

+ cc_hash_global_init();
+
ret = cc_debugfs_global_init();
if (ret)
return ret;
diff --git a/drivers/staging/ccree/ssi_hash.c b/drivers/staging/ccree/ssi_hash.c
index 5324914..06cc5cd 100644
--- a/drivers/staging/ccree/ssi_hash.c
+++ b/drivers/staging/ccree/ssi_hash.c
@@ -41,10 +41,10 @@ static const u32 sha256_init[] = {
#if (CC_DEV_SHA_MAX > 256)
static const u32 digest_len_sha512_init[] = {
0x00000080, 0x00000000, 0x00000000, 0x00000000 };
-static const u64 sha384_init[] = {
+static u64 sha384_init[] = {
SHA384_H7, SHA384_H6, SHA384_H5, SHA384_H4,
SHA384_H3, SHA384_H2, SHA384_H1, SHA384_H0 };
-static const u64 sha512_init[] = {
+static u64 sha512_init[] = {
SHA512_H7, SHA512_H6, SHA512_H5, SHA512_H4,
SHA512_H3, SHA512_H2, SHA512_H1, SHA512_H0 };
#endif
@@ -55,6 +55,8 @@ static void cc_setup_xcbc(struct ahash_request *areq, struct cc_hw_desc desc[],
static void cc_setup_cmac(struct ahash_request *areq, struct cc_hw_desc desc[],
unsigned int *seq_size);

+static const void *cc_larval_digest(struct device *dev, u32 mode);
+
struct cc_hash_alg {
struct list_head entry;
int hash_mode;
@@ -126,10 +128,6 @@ static int cc_map_req(struct device *dev, struct ahash_req_ctx *state,
struct cc_hash_ctx *ctx, gfp_t flags)
{
bool is_hmac = ctx->is_hmac;
- cc_sram_addr_t larval_digest_addr =
- cc_larval_digest_addr(ctx->drvdata, ctx->hash_mode);
- struct cc_crypto_req cc_req = {};
- struct cc_hw_desc desc;
int rc = -ENOMEM;

state->buff0 = kzalloc(CC_MAX_HASH_BLCK_SIZE, flags);
@@ -203,9 +201,6 @@ static int cc_map_req(struct device *dev, struct ahash_req_ctx *state,
HASH_LEN_SIZE);
#endif
}
- dma_sync_single_for_device(dev, state->digest_buff_dma_addr,
- ctx->inter_digestsize,
- DMA_BIDIRECTIONAL);

if (ctx->hash_mode != DRV_HASH_NULL) {
dma_sync_single_for_cpu(dev,
@@ -216,22 +211,15 @@ static int cc_map_req(struct device *dev, struct ahash_req_ctx *state,
ctx->opad_tmp_keys_buff, ctx->inter_digestsize);
}
} else { /*hash*/
- /* Copy the initial digests if hash flow. The SRAM contains the
- * initial digests in the expected order for all SHA*
- */
- hw_desc_init(&desc);
- set_din_sram(&desc, larval_digest_addr, ctx->inter_digestsize);
- set_dout_dlli(&desc, state->digest_buff_dma_addr,
- ctx->inter_digestsize, NS_BIT, 0);
- set_flow_mode(&desc, BYPASS);
+ /* Copy the initial digests if hash flow. */
+ const void *larval = cc_larval_digest(dev, ctx->hash_mode);

- rc = send_request(ctx->drvdata, &cc_req, &desc, 1, 0);
- if (rc) {
- dev_err(dev, "send_request() failed (rc=%d)\n", rc);
- goto fail4;
- }
+ memcpy(state->digest_buff, larval, ctx->inter_digestsize);
}

+ dma_sync_single_for_device(dev, state->digest_buff_dma_addr,
+ ctx->inter_digestsize, DMA_BIDIRECTIONAL);
+
if (ctx->hw_mode != DRV_CIPHER_XCBC_MAC) {
state->digest_bytes_len_dma_addr =
dma_map_single(dev, (void *)state->digest_bytes_len,
@@ -2003,11 +1991,7 @@ int cc_init_hash_sram(struct cc_drvdata *drvdata)
cc_sram_addr_t sram_buff_ofs = hash_handle->digest_len_sram_addr;
unsigned int larval_seq_len = 0;
struct cc_hw_desc larval_seq[CC_DIGEST_SIZE_MAX / sizeof(u32)];
- struct device *dev = drvdata_to_dev(drvdata);
int rc = 0;
-#if (CC_DEV_SHA_MAX > 256)
- int i;
-#endif

/* Copy-to-sram digest-len */
cc_set_sram_desc(digest_len_init, sram_buff_ofs,
@@ -2074,49 +2058,49 @@ int cc_init_hash_sram(struct cc_drvdata *drvdata)
larval_seq_len = 0;

#if (CC_DEV_SHA_MAX > 256)
- /* We are forced to swap each double-word larval before copying to
- * sram
- */
- for (i = 0; i < ARRAY_SIZE(sha384_init); i++) {
- const u32 const0 = ((u32 *)((u64 *)&sha384_init[i]))[1];
- const u32 const1 = ((u32 *)((u64 *)&sha384_init[i]))[0];
-
- cc_set_sram_desc(&const0, sram_buff_ofs, 1, larval_seq,
- &larval_seq_len);
- sram_buff_ofs += sizeof(u32);
- cc_set_sram_desc(&const1, sram_buff_ofs, 1, larval_seq,
- &larval_seq_len);
- sram_buff_ofs += sizeof(u32);
- }
+ cc_set_sram_desc((u32 *)sha384_init, sram_buff_ofs,
+ (ARRAY_SIZE(sha384_init) * 2), larval_seq,
+ &larval_seq_len);
rc = send_request_init(drvdata, larval_seq, larval_seq_len);
- if (rc) {
- dev_err(dev, "send_request() failed (rc = %d)\n", rc);
+ if (rc)
goto init_digest_const_err;
- }
+ sram_buff_ofs += sizeof(sha384_init);
larval_seq_len = 0;

- for (i = 0; i < ARRAY_SIZE(sha512_init); i++) {
- const u32 const0 = ((u32 *)((u64 *)&sha512_init[i]))[1];
- const u32 const1 = ((u32 *)((u64 *)&sha512_init[i]))[0];
-
- cc_set_sram_desc(&const0, sram_buff_ofs, 1, larval_seq,
- &larval_seq_len);
- sram_buff_ofs += sizeof(u32);
- cc_set_sram_desc(&const1, sram_buff_ofs, 1, larval_seq,
- &larval_seq_len);
- sram_buff_ofs += sizeof(u32);
- }
+ cc_set_sram_desc((u32 *)sha512_init, sram_buff_ofs,
+ (ARRAY_SIZE(sha512_init) * 2), larval_seq,
+ &larval_seq_len);
rc = send_request_init(drvdata, larval_seq, larval_seq_len);
- if (rc) {
- dev_err(dev, "send_request() failed (rc = %d)\n", rc);
+ if (rc)
goto init_digest_const_err;
- }
#endif

init_digest_const_err:
return rc;
}

+static void __init cc_swap_dwords(u32 *buf, unsigned long size)
+{
+ int i;
+ u32 tmp;
+
+ for (i = 0; i < size; i += 2) {
+ tmp = buf[i];
+ buf[i] = buf[i + 1];
+ buf[i + 1] = tmp;
+ }
+}
+
+/*
+ * Due to the way the HW works we need to swap every
+ * double word in the SHA384 and SHA512 larval hashes
+ */
+void __init cc_hash_global_init(void)
+{
+ cc_swap_dwords((u32 *)&sha384_init, (ARRAY_SIZE(sha384_init) * 2));
+ cc_swap_dwords((u32 *)&sha512_init, (ARRAY_SIZE(sha512_init) * 2));
+}
+
int cc_hash_alloc(struct cc_drvdata *drvdata)
{
struct cc_hash_handle *hash_handle;
@@ -2373,6 +2357,29 @@ static void cc_set_desc(struct ahash_req_ctx *areq_ctx,
*seq_size = idx;
}

+static const void *cc_larval_digest(struct device *dev, u32 mode)
+{
+ switch (mode) {
+ case DRV_HASH_MD5:
+ return md5_init;
+ case DRV_HASH_SHA1:
+ return sha1_init;
+ case DRV_HASH_SHA224:
+ return sha224_init;
+ case DRV_HASH_SHA256:
+ return sha256_init;
+#if (CC_DEV_SHA_MAX > 256)
+ case DRV_HASH_SHA384:
+ return sha384_init;
+ case DRV_HASH_SHA512:
+ return sha512_init;
+#endif
+ default:
+ dev_err(dev, "Invalid hash mode (%d)\n", mode);
+ return md5_init;
+ }
+}
+
/*!
* Gets the address of the initial digest in SRAM
* according to the given hash mode
diff --git a/drivers/staging/ccree/ssi_hash.h b/drivers/staging/ccree/ssi_hash.h
index a192249..484cbb4 100644
--- a/drivers/staging/ccree/ssi_hash.h
+++ b/drivers/staging/ccree/ssi_hash.h
@@ -90,5 +90,7 @@ cc_digest_len_addr(void *drvdata, u32 mode);
*/
cc_sram_addr_t cc_larval_digest_addr(void *drvdata, u32 mode);

+void cc_hash_global_init(void);
+
#endif /*__CC_HASH_H__*/

--
2.7.4
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