summaryrefslogtreecommitdiff
path: root/drivers/crypto/ccp
diff options
context:
space:
mode:
authorGary R Hook <gary.hook@amd.com>2017-07-17 15:16:13 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2017-07-28 17:58:02 +0800
commit6ba46c7d4d7e2b4f38c9d9891dee4ba1f5338f31 (patch)
tree7f8dabbcc83c52a1d569f6219e76c71cf57b1fb9 /drivers/crypto/ccp
parent68cc652f83b9a4f79471db6c79ae0bfe5175eda3 (diff)
crypto: ccp - Fix base RSA function for version 5 CCPs
Version 5 devices have requirements for buffer lengths, as well as parameter format (e.g. bits vs. bytes). Fix the base CCP driver code to meet requirements all supported versions. Signed-off-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/ccp')
-rw-r--r--drivers/crypto/ccp/ccp-dev-v5.c10
-rw-r--r--drivers/crypto/ccp/ccp-ops.c78
2 files changed, 54 insertions, 34 deletions
diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index b3526336d608..5f9e82beadfd 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -469,7 +469,7 @@ static int ccp5_perform_rsa(struct ccp_op *op)
CCP5_CMD_PROT(&desc) = 0;
function.raw = 0;
- CCP_RSA_SIZE(&function) = op->u.rsa.mod_size >> 3;
+ CCP_RSA_SIZE(&function) = (op->u.rsa.mod_size + 7) >> 3;
CCP5_CMD_FUNCTION(&desc) = function.raw;
CCP5_CMD_LEN(&desc) = op->u.rsa.input_len;
@@ -484,10 +484,10 @@ static int ccp5_perform_rsa(struct ccp_op *op)
CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma);
CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM;
- /* Exponent is in LSB memory */
- CCP5_CMD_KEY_LO(&desc) = op->sb_key * LSB_ITEM_SIZE;
- CCP5_CMD_KEY_HI(&desc) = 0;
- CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SB;
+ /* Key (Exponent) is in external memory */
+ CCP5_CMD_KEY_LO(&desc) = ccp_addr_lo(&op->exp.u.dma);
+ CCP5_CMD_KEY_HI(&desc) = ccp_addr_hi(&op->exp.u.dma);
+ CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SYSTEM;
return ccp5_do_cmd(&desc, op->cmd_q);
}
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index e23d138fc1ce..1b757531f79a 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -1731,8 +1731,7 @@ e_ctx:
static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
struct ccp_rsa_engine *rsa = &cmd->u.rsa;
- struct ccp_dm_workarea exp, src;
- struct ccp_data dst;
+ struct ccp_dm_workarea exp, src, dst;
struct ccp_op op;
unsigned int sb_count, i_len, o_len;
int ret;
@@ -1743,30 +1742,40 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
if (!rsa->exp || !rsa->mod || !rsa->src || !rsa->dst)
return -EINVAL;
+ memset(&op, 0, sizeof(op));
+ op.cmd_q = cmd_q;
+ op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
+
/* The RSA modulus must precede the message being acted upon, so
* it must be copied to a DMA area where the message and the
* modulus can be concatenated. Therefore the input buffer
* length required is twice the output buffer length (which
- * must be a multiple of 256-bits).
+ * must be a multiple of 256-bits). Compute o_len, i_len in bytes.
+ * Buffer sizes must be a multiple of 32 bytes; rounding up may be
+ * required.
*/
- o_len = ((rsa->key_size + 255) / 256) * 32;
+ o_len = 32 * ((rsa->key_size + 255) / 256);
i_len = o_len * 2;
- sb_count = o_len / CCP_SB_BYTES;
-
- memset(&op, 0, sizeof(op));
- op.cmd_q = cmd_q;
- op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
- op.sb_key = cmd_q->ccp->vdata->perform->sballoc(cmd_q, sb_count);
-
- if (!op.sb_key)
- return -EIO;
+ if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0)) {
+ /* sb_count is the number of storage block slots required
+ * for the modulus.
+ */
+ sb_count = o_len / CCP_SB_BYTES;
+ op.sb_key = cmd_q->ccp->vdata->perform->sballoc(cmd_q,
+ sb_count);
+ if (!op.sb_key)
+ return -EIO;
+ } else {
+ /* A version 5 device allows a modulus size that will not fit
+ * in the LSB, so the command will transfer it from memory.
+ * Set the sb key to the default, even though it's not used.
+ */
+ op.sb_key = cmd_q->sb_key;
+ }
- /* The RSA exponent may span multiple (32-byte) SB entries and must
- * be in little endian format. Reverse copy each 32-byte chunk
- * of the exponent (En chunk to E0 chunk, E(n-1) chunk to E1 chunk)
- * and each byte within that chunk and do not perform any byte swap
- * operations on the passthru operation.
+ /* The RSA exponent must be in little endian format. Reverse its
+ * byte order.
*/
ret = ccp_init_dm_workarea(&exp, cmd_q, o_len, DMA_TO_DEVICE);
if (ret)
@@ -1775,11 +1784,22 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
ret = ccp_reverse_set_dm_area(&exp, 0, rsa->exp, 0, rsa->exp_len);
if (ret)
goto e_exp;
- ret = ccp_copy_to_sb(cmd_q, &exp, op.jobid, op.sb_key,
- CCP_PASSTHRU_BYTESWAP_NOOP);
- if (ret) {
- cmd->engine_error = cmd_q->cmd_error;
- goto e_exp;
+
+ if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0)) {
+ /* Copy the exponent to the local storage block, using
+ * as many 32-byte blocks as were allocated above. It's
+ * already little endian, so no further change is required.
+ */
+ ret = ccp_copy_to_sb(cmd_q, &exp, op.jobid, op.sb_key,
+ CCP_PASSTHRU_BYTESWAP_NOOP);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_exp;
+ }
+ } else {
+ /* The exponent can be retrieved from memory via DMA. */
+ op.exp.u.dma.address = exp.dma.address;
+ op.exp.u.dma.offset = 0;
}
/* Concatenate the modulus and the message. Both the modulus and
@@ -1798,8 +1818,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
goto e_src;
/* Prepare the output area for the operation */
- ret = ccp_init_data(&dst, cmd_q, rsa->dst, rsa->mod_len,
- o_len, DMA_FROM_DEVICE);
+ ret = ccp_init_dm_workarea(&dst, cmd_q, o_len, DMA_FROM_DEVICE);
if (ret)
goto e_src;
@@ -1807,7 +1826,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
op.src.u.dma.address = src.dma.address;
op.src.u.dma.offset = 0;
op.src.u.dma.length = i_len;
- op.dst.u.dma.address = dst.dm_wa.dma.address;
+ op.dst.u.dma.address = dst.dma.address;
op.dst.u.dma.offset = 0;
op.dst.u.dma.length = o_len;
@@ -1820,10 +1839,10 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
goto e_dst;
}
- ccp_reverse_get_dm_area(&dst.dm_wa, 0, rsa->dst, 0, rsa->mod_len);
+ ccp_reverse_get_dm_area(&dst, 0, rsa->dst, 0, rsa->mod_len);
e_dst:
- ccp_free_data(&dst, cmd_q);
+ ccp_dm_free(&dst);
e_src:
ccp_dm_free(&src);
@@ -1832,7 +1851,8 @@ e_exp:
ccp_dm_free(&exp);
e_sb:
- cmd_q->ccp->vdata->perform->sbfree(cmd_q, op.sb_key, sb_count);
+ if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0))
+ cmd_q->ccp->vdata->perform->sbfree(cmd_q, op.sb_key, sb_count);
return ret;
}