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Code Issues Releases Wiki Activity

crypto: arm/aes-ce - yield the SIMD unit between scatterwalk steps

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Reduce the scope of the kernel_neon_begin/end regions so that the SIMD
unit is released (and thus preemption re-enabled) if the crypto operation
cannot be completed in a single scatterwalk step. This avoids scheduling
blackouts due to preemption being enabled for unbounded periods, resulting
in a more responsive system.

After this change, we can also permit the cipher_walk infrastructure to
sleep, so set the 'atomic' parameter to skcipher_walk_virt() to false as
well.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-09-03 09:43:24 -07:00 committed by Herbert Xu
parent fcb0e30df0
commit 46a22776bc
2 changed files with 34 additions and 35 deletions
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47
arch/arm/crypto/aes-ce-glue.c
View file

@ -177,15 +177,15 @@ static int ecb_encrypt(struct skcipher_request *req)
unsigned int blocks;
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
ce_aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key_enc, num_rounds(ctx), blocks);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -197,15 +197,15 @@ static int ecb_decrypt(struct skcipher_request *req)
unsigned int blocks;
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
ce_aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key_dec, num_rounds(ctx), blocks);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -217,16 +217,16 @@ static int cbc_encrypt(struct skcipher_request *req)
unsigned int blocks;
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
ce_aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key_enc, num_rounds(ctx), blocks,
walk.iv);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -238,16 +238,16 @@ static int cbc_decrypt(struct skcipher_request *req)
unsigned int blocks;
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
ce_aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key_dec, num_rounds(ctx), blocks,
walk.iv);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -258,13 +258,14 @@ static int ctr_encrypt(struct skcipher_request *req)
struct skcipher_walk walk;
int err, blocks;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
ce_aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key_enc, num_rounds(ctx), blocks,
walk.iv);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
if (walk.nbytes) {
@ -278,13 +279,13 @@ static int ctr_encrypt(struct skcipher_request *req)
*/
blocks = -1;
kernel_neon_begin();
ce_aes_ctr_encrypt(tail, NULL, ctx->key_enc, num_rounds(ctx),
blocks, walk.iv);
kernel_neon_end();
crypto_xor_cpy(tdst, tsrc, tail, nbytes);
err = skcipher_walk_done(&walk, 0);
}
kernel_neon_end();
return err;
}
@ -319,17 +320,16 @@ static int xts_encrypt(struct skcipher_request *req)
struct skcipher_walk walk;
unsigned int blocks;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
kernel_neon_begin();
ce_aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key1.key_enc, rounds, blocks, walk.iv,
ctx->key2.key_enc, first);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -341,17 +341,16 @@ static int xts_decrypt(struct skcipher_request *req)
struct skcipher_walk walk;
unsigned int blocks;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
kernel_neon_begin();
ce_aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key1.key_dec, rounds, blocks, walk.iv,
ctx->key2.key_enc, first);
kernel_neon_end();
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}

22
arch/arm/crypto/aes-neonbs-glue.c
View file

@ -90,9 +90,8 @@ static int __ecb_crypt(struct skcipher_request *req,
struct skcipher_walk walk;
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while (walk.nbytes >= AES_BLOCK_SIZE) {
unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
@ -100,12 +99,13 @@ static int __ecb_crypt(struct skcipher_request *req,
blocks = round_down(blocks,
walk.stride / AES_BLOCK_SIZE);
kernel_neon_begin();
fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->rk,
ctx->rounds, blocks);
kernel_neon_end();
err = skcipher_walk_done(&walk,
walk.nbytes - blocks * AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -159,9 +159,8 @@ static int cbc_decrypt(struct skcipher_request *req)
struct skcipher_walk walk;
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while (walk.nbytes >= AES_BLOCK_SIZE) {
unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
@ -169,13 +168,14 @@ static int cbc_decrypt(struct skcipher_request *req)
blocks = round_down(blocks,
walk.stride / AES_BLOCK_SIZE);
kernel_neon_begin();
aesbs_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->key.rk, ctx->key.rounds, blocks,
walk.iv);
kernel_neon_end();
err = skcipher_walk_done(&walk,
walk.nbytes - blocks * AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -223,9 +223,8 @@ static int ctr_encrypt(struct skcipher_request *req)
u8 buf[AES_BLOCK_SIZE];
int err;
err = skcipher_walk_virt(&walk, req, true);
err = skcipher_walk_virt(&walk, req, false);
kernel_neon_begin();
while (walk.nbytes > 0) {
unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
u8 *final = (walk.total % AES_BLOCK_SIZE) ? buf : NULL;
@ -236,8 +235,10 @@ static int ctr_encrypt(struct skcipher_request *req)
final = NULL;
}
kernel_neon_begin();
aesbs_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
ctx->rk, ctx->rounds, blocks, walk.iv, final);
kernel_neon_end();
if (final) {
u8 *dst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
@ -252,7 +253,6 @@ static int ctr_encrypt(struct skcipher_request *req)
err = skcipher_walk_done(&walk,
walk.nbytes - blocks * AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}
@ -329,7 +329,6 @@ static int __xts_crypt(struct skcipher_request *req,
crypto_cipher_encrypt_one(ctx->tweak_tfm, walk.iv, walk.iv);
kernel_neon_begin();
while (walk.nbytes >= AES_BLOCK_SIZE) {
unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
@ -337,12 +336,13 @@ static int __xts_crypt(struct skcipher_request *req,
blocks = round_down(blocks,
walk.stride / AES_BLOCK_SIZE);
kernel_neon_begin();
fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->key.rk,
ctx->key.rounds, blocks, walk.iv);
kernel_neon_end();
err = skcipher_walk_done(&walk,
walk.nbytes - blocks * AES_BLOCK_SIZE);
}
kernel_neon_end();
return err;
}