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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-31 15:58:45 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-25 11:01:20 +1100
commit420a4b20c504e4674bf253601f793bdb254f99fa (patch)
tree574f50a8ac2a5f8abfbbdec1519a47ae837a3381 /drivers/crypto/padlock-aes.c
parent1c06da81a5d042d5fba67c4c533b16ae62a174ab (diff)
downloadlinux-linaro-stable-420a4b20c504e4674bf253601f793bdb254f99fa.tar.gz
crypto: padlock - Avoid resetting cword on successive operations
Resetting the control word is quite expensive. Fortunately this isn't an issue for the common operations such as CBC and ECB as the whole operation is done through a single call. However, modes such as LRW and XTS have to call padlock over and over again for one operation which really hurts if each call resets the control word. This patch uses an idea by Sebastian Siewior to store the last control word used on a CPU and only reset the control word if that changes. Note that any task switch automatically resets the control word so we only need to be accurate with regard to the stored control word when no task switches occur. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/padlock-aes.c')
-rw-r--r--drivers/crypto/padlock-aes.c52
1 files changed, 42 insertions, 10 deletions
diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
index bf2917d197a0..856b3cc25583 100644
--- a/drivers/crypto/padlock-aes.c
+++ b/drivers/crypto/padlock-aes.c
@@ -15,6 +15,8 @@
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
#include <asm/byteorder.h>
#include <asm/i387.h>
#include "padlock.h"
@@ -49,6 +51,8 @@ struct aes_ctx {
u32 *D;
};
+static DEFINE_PER_CPU(struct cword *, last_cword);
+
/* Tells whether the ACE is capable to generate
the extended key for a given key_len. */
static inline int
@@ -89,6 +93,7 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
const __le32 *key = (const __le32 *)in_key;
u32 *flags = &tfm->crt_flags;
struct crypto_aes_ctx gen_aes;
+ int cpu;
if (key_len % 8) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
@@ -118,7 +123,7 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
/* Don't generate extended keys if the hardware can do it. */
if (aes_hw_extkey_available(key_len))
- return 0;
+ goto ok;
ctx->D = ctx->d_data;
ctx->cword.encrypt.keygen = 1;
@@ -131,15 +136,30 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
memcpy(ctx->E, gen_aes.key_enc, AES_MAX_KEYLENGTH);
memcpy(ctx->D, gen_aes.key_dec, AES_MAX_KEYLENGTH);
+
+ok:
+ for_each_online_cpu(cpu)
+ if (&ctx->cword.encrypt == per_cpu(last_cword, cpu) ||
+ &ctx->cword.decrypt == per_cpu(last_cword, cpu))
+ per_cpu(last_cword, cpu) = NULL;
+
return 0;
}
/* ====== Encryption/decryption routines ====== */
/* These are the real call to PadLock. */
-static inline void padlock_reset_key(void)
+static inline void padlock_reset_key(struct cword *cword)
+{
+ int cpu = raw_smp_processor_id();
+
+ if (cword != per_cpu(last_cword, cpu))
+ asm volatile ("pushfl; popfl");
+}
+
+static inline void padlock_store_cword(struct cword *cword)
{
- asm volatile ("pushfl; popfl");
+ per_cpu(last_cword, raw_smp_processor_id()) = cword;
}
/*
@@ -149,7 +169,7 @@ static inline void padlock_reset_key(void)
*/
static inline void padlock_xcrypt(const u8 *input, u8 *output, void *key,
- void *control_word)
+ struct cword *control_word)
{
asm volatile (".byte 0xf3,0x0f,0xa7,0xc8" /* rep xcryptecb */
: "+S"(input), "+D"(output)
@@ -213,22 +233,24 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aes_ctx *ctx = aes_ctx(tfm);
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
ts_state = irq_ts_save();
aes_crypt(in, out, ctx->E, &ctx->cword.encrypt);
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.encrypt);
}
static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct aes_ctx *ctx = aes_ctx(tfm);
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
ts_state = irq_ts_save();
aes_crypt(in, out, ctx->D, &ctx->cword.decrypt);
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.encrypt);
}
static struct crypto_alg aes_alg = {
@@ -261,7 +283,7 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -276,6 +298,8 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
}
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.encrypt);
+
return err;
}
@@ -288,7 +312,7 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.decrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -302,6 +326,9 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
err = blkcipher_walk_done(desc, &walk, nbytes);
}
irq_ts_restore(ts_state);
+
+ padlock_store_cword(&ctx->cword.encrypt);
+
return err;
}
@@ -336,7 +363,7 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -353,6 +380,8 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
}
irq_ts_restore(ts_state);
+ padlock_store_cword(&ctx->cword.decrypt);
+
return err;
}
@@ -365,7 +394,7 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
int err;
int ts_state;
- padlock_reset_key();
+ padlock_reset_key(&ctx->cword.encrypt);
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
@@ -380,6 +409,9 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
}
irq_ts_restore(ts_state);
+
+ padlock_store_cword(&ctx->cword.encrypt);
+
return err;
}