crypto: aes-ni - Add support for more modes

Because kernel_fpu_begin() and kernel_fpu_end() operations are too
slow, the performance gain of general mode implementation + aes-aesni
is almost all compensated.

The AES-NI support for more modes are implemented as follow:

- Add a new AES algorithm implementation named __aes-aesni without
  kernel_fpu_begin/end()

- Use fpu(<mode>(AES)) to provide kenrel_fpu_begin/end() invoking

- Add <mode>(AES) ablkcipher, which uses cryptd(fpu(<mode>(AES))) to
  defer cryption to cryptd context in soft_irq context.

Now the ctr, lrw, pcbc and xts support are added.

Performance testing based on dm-crypt shows that cryption time can be
reduced to 50% of general mode implementation + aes-aesni implementation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -491,6 +491,7 @@ config CRYPTO_AES_NI_INTEL
 	select CRYPTO_AES_X86_64
 	select CRYPTO_CRYPTD
 	select CRYPTO_ALGAPI
+	select CRYPTO_FPU
 	help
 	  Use Intel AES-NI instructions for AES algorithm.
 
@@ -510,6 +511,10 @@ config CRYPTO_AES_NI_INTEL
 
 	  See <http://csrc.nist.gov/encryption/aes/> for more information.
 
+	  In addition to AES cipher algorithm support, the
+	  acceleration for some popular block cipher mode is supported
+	  too, including ECB, CBC, CTR, LRW, PCBC, XTS.
+
 config CRYPTO_ANUBIS
 	tristate "Anubis cipher algorithm"
 	select CRYPTO_ALGAPI