s390/crc32: expose CRC32 functions through lib

Move the s390 CRC32 assembly code into the lib directory and wire it up
to the library interface.  This allows it to be used without going
through the crypto API.  It remains usable via the crypto API too via
the shash algorithms that use the library interface.  Thus all the
arch-specific "shash" code becomes unnecessary and is removed.

Note: to see the diff from arch/s390/crypto/crc32-vx.c to
arch/s390/lib/crc32-glue.c, view this commit with 'git show -M10'.

Reviewed-by: Ard Biesheuvel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Eric Biggers <[email protected]>

Author: ebiggers

arch/s390/Kconfig

@@ -72,6 +72,7 @@ config S390
 	select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
 	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
+	select ARCH_HAS_CRC32
 	select ARCH_HAS_CURRENT_STACK_POINTER
 	select ARCH_HAS_DEBUG_VIRTUAL
 	select ARCH_HAS_DEBUG_VM_PGTABLE

arch/s390/configs/debug_defconfig

@@ -795,7 +795,6 @@ CONFIG_CRYPTO_USER_API_HASH=m
 CONFIG_CRYPTO_USER_API_SKCIPHER=m
 CONFIG_CRYPTO_USER_API_RNG=m
 CONFIG_CRYPTO_USER_API_AEAD=m
-CONFIG_CRYPTO_CRC32_S390=y
 CONFIG_CRYPTO_SHA512_S390=m
 CONFIG_CRYPTO_SHA1_S390=m
 CONFIG_CRYPTO_SHA256_S390=m

arch/s390/configs/defconfig

@@ -782,7 +782,6 @@ CONFIG_CRYPTO_USER_API_HASH=m
 CONFIG_CRYPTO_USER_API_SKCIPHER=m
 CONFIG_CRYPTO_USER_API_RNG=m
 CONFIG_CRYPTO_USER_API_AEAD=m
-CONFIG_CRYPTO_CRC32_S390=y
 CONFIG_CRYPTO_SHA512_S390=m
 CONFIG_CRYPTO_SHA1_S390=m
 CONFIG_CRYPTO_SHA256_S390=m

arch/s390/crypto/Kconfig

@@ -2,18 +2,6 @@
 
 menu "Accelerated Cryptographic Algorithms for CPU (s390)"
 
-config CRYPTO_CRC32_S390
-	tristate "CRC32c and CRC32"
-	depends on S390
-	select CRYPTO_HASH
-	select CRC32
-	help
-	  CRC32c and CRC32 CRC algorithms
-
-	  Architecture: s390
-
-	  It is available with IBM z13 or later.
-
 config CRYPTO_SHA512_S390
 	tristate "Hash functions: SHA-384 and SHA-512"
 	depends on S390

arch/s390/crypto/Makefile

@@ -14,9 +14,7 @@ obj-$(CONFIG_CRYPTO_PAES_S390) += paes_s390.o
 obj-$(CONFIG_CRYPTO_CHACHA_S390) += chacha_s390.o
 obj-$(CONFIG_S390_PRNG) += prng.o
 obj-$(CONFIG_CRYPTO_GHASH_S390) += ghash_s390.o
-obj-$(CONFIG_CRYPTO_CRC32_S390) += crc32-vx_s390.o
 obj-$(CONFIG_CRYPTO_HMAC_S390) += hmac_s390.o
 obj-y += arch_random.o
 
-crc32-vx_s390-y := crc32-vx.o crc32le-vx.o crc32be-vx.o
 chacha_s390-y := chacha-glue.o chacha-s390.o

arch/s390/crypto/crc32-vx.c

@@ -24,3 +24,6 @@ obj-$(CONFIG_S390_MODULES_SANITY_TEST_HELPERS) += test_modules_helpers.o
 lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
 
 obj-$(CONFIG_EXPOLINE_EXTERN) += expoline.o
+
+obj-$(CONFIG_CRC32_ARCH) += crc32-s390.o
+crc32-s390-y := crc32-glue.o crc32le-vx.o crc32be-vx.o