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crypto: stm32 - Use accelerated readsl/writesl

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When reading or writing crypto buffers the inner loops can
be replaced with readsl and writesl which will on ARM result
in a tight assembly loop, speeding up encryption/decryption
a little bit. This optimization was in the Ux500 driver so
let's carry it over to the STM32 driver.

Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Lionel Debieve <lionel.debieve@foss.st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Linus Walleij 2023-01-10 20:43:07 +01:00 committed by Herbert Xu
parent f104b2169e
commit 319ad16d62
1 changed files with 11 additions and 26 deletions
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37
drivers/crypto/stm32/stm32-cryp.c
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@ -597,7 +597,6 @@ static void stm32_crypt_gcmccm_end_header(struct stm32_cryp *cryp)
static void stm32_cryp_write_ccm_first_header(struct stm32_cryp *cryp)
{
unsigned int i;
size_t written;
size_t len;
u32 alen = cryp->areq->assoclen;
@ -623,8 +622,8 @@ static void stm32_cryp_write_ccm_first_header(struct stm32_cryp *cryp)
written = min_t(size_t, AES_BLOCK_SIZE - len, alen);
scatterwalk_copychunks((char *)block + len, &cryp->in_walk, written, 0);
for (i = 0; i < AES_BLOCK_32; i++)
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
writesl(cryp->regs + cryp->caps->din, block, AES_BLOCK_32);
cryp->header_in -= written;
@ -1363,18 +1362,14 @@ static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
u32 out_tag[AES_BLOCK_32];
/* Get and write tag */
for (i = 0; i < AES_BLOCK_32; i++)
out_tag[i] = stm32_cryp_read(cryp, cryp->caps->dout);
readsl(cryp->regs + cryp->caps->dout, out_tag, AES_BLOCK_32);
scatterwalk_copychunks(out_tag, &cryp->out_walk, cryp->authsize, 1);
} else {
/* Get and check tag */
u32 in_tag[AES_BLOCK_32], out_tag[AES_BLOCK_32];
scatterwalk_copychunks(in_tag, &cryp->in_walk, cryp->authsize, 0);
for (i = 0; i < AES_BLOCK_32; i++)
out_tag[i] = stm32_cryp_read(cryp, cryp->caps->dout);
readsl(cryp->regs + cryp->caps->dout, out_tag, AES_BLOCK_32);
if (crypto_memneq(in_tag, out_tag, cryp->authsize))
ret = -EBADMSG;
@ -1415,12 +1410,9 @@ static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
static void stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
{
unsigned int i;
u32 block[AES_BLOCK_32];
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
readsl(cryp->regs + cryp->caps->dout, block, cryp->hw_blocksize / sizeof(u32));
scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
cryp->payload_out), 1);
cryp->payload_out -= min_t(size_t, cryp->hw_blocksize,
@ -1429,14 +1421,11 @@ static void stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
{
unsigned int i;
u32 block[AES_BLOCK_32] = {0};
scatterwalk_copychunks(block, &cryp->in_walk, min_t(size_t, cryp->hw_blocksize,
cryp->payload_in), 0);
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
writesl(cryp->regs + cryp->caps->din, block, cryp->hw_blocksize / sizeof(u32));
cryp->payload_in -= min_t(size_t, cryp->hw_blocksize, cryp->payload_in);
}
@ -1480,8 +1469,7 @@ static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
* Same code as stm32_cryp_irq_read_data(), but we want to store
* block value
*/
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
readsl(cryp->regs + cryp->caps->dout, block, cryp->hw_blocksize / sizeof(u32));
scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
cryp->payload_out), 1);
@ -1499,8 +1487,7 @@ static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
stm32_cryp_write(cryp, cryp->caps->cr, cfg);
/* f) write padded data */
for (i = 0; i < AES_BLOCK_32; i++)
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
writesl(cryp->regs + cryp->caps->din, block, AES_BLOCK_32);
/* g) Empty fifo out */
err = stm32_cryp_wait_output(cryp);
@ -1580,8 +1567,7 @@ static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
* Same code as stm32_cryp_irq_read_data(), but we want to store
* block value
*/
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
readsl(cryp->regs + cryp->caps->dout, block, cryp->hw_blocksize / sizeof(u32));
scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
cryp->payload_out), 1);
@ -1660,15 +1646,14 @@ static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp)
static void stm32_cryp_irq_write_gcmccm_header(struct stm32_cryp *cryp)
{
unsigned int i;
u32 block[AES_BLOCK_32] = {0};
size_t written;
written = min_t(size_t, AES_BLOCK_SIZE, cryp->header_in);
scatterwalk_copychunks(block, &cryp->in_walk, written, 0);
for (i = 0; i < AES_BLOCK_32; i++)
stm32_cryp_write(cryp, cryp->caps->din, block[i]);
writesl(cryp->regs + cryp->caps->din, block, AES_BLOCK_32);
cryp->header_in -= written;