crypto: riscv/sha256 - Add simd block function

Add CRYPTO_ARCH_HAVE_LIB_SHA256_SIMD and a SIMD block function
so that the caller can decide whether to use SIMD.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/riscv/lib/crypto/Kconfig

@@ -12,4 +12,5 @@ config CRYPTO_SHA256_RISCV64
 	depends on 64BIT && RISCV_ISA_V && TOOLCHAIN_HAS_VECTOR_CRYPTO
 	default CRYPTO_LIB_SHA256
 	select CRYPTO_ARCH_HAVE_LIB_SHA256
+	select CRYPTO_ARCH_HAVE_LIB_SHA256_SIMD
 	select CRYPTO_LIB_SHA256_GENERIC

arch/riscv/lib/crypto/sha256.c

@@ -9,10 +9,8 @@
  * Author: Jerry Shih <jerry.shih@sifive.com>
  */
 
-#include <asm/simd.h>
 #include <asm/vector.h>
 #include <crypto/internal/sha2.h>
-#include <crypto/internal/simd.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 
@@ -21,10 +19,10 @@ asmlinkage void sha256_transform_zvknha_or_zvknhb_zvkb(
 
 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_extensions);
 
-void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
+void sha256_blocks_simd(u32 state[SHA256_STATE_WORDS],
 			const u8 *data, size_t nblocks)
 {
-	if (static_branch_likely(&have_extensions) && crypto_simd_usable()) {
+	if (static_branch_likely(&have_extensions)) {
 		kernel_vector_begin();
 		sha256_transform_zvknha_or_zvknhb_zvkb(state, data, nblocks);
 		kernel_vector_end();
@@ -32,6 +30,13 @@ void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
 		sha256_blocks_generic(state, data, nblocks);
 	}
 }
+EXPORT_SYMBOL_GPL(sha256_blocks_simd);
+
+void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
+			const u8 *data, size_t nblocks)
+{
+	sha256_blocks_generic(state, data, nblocks);
+}
 EXPORT_SYMBOL_GPL(sha256_blocks_arch);
 
 bool sha256_is_arch_optimized(void)