[05/15] mips/crc32: expose CRC32 functions through lib

Message ID	20241021002935.325878-6-ebiggers@kernel.org (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org> From: Eric Biggers <ebiggers@kernel.org> To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mips@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH 05/15] mips/crc32: expose CRC32 functions through lib Date: Sun, 20 Oct 2024 17:29:25 -0700 Message-ID: <20241021002935.325878-6-ebiggers@kernel.org> In-Reply-To: <20241021002935.325878-1-ebiggers@kernel.org> References: <20241021002935.325878-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" <linux-riscv-bounces@lists.infradead.org> Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org
Series	Wire up CRC32 library functions to arch-optimized code \| expand [00/15] Wire up CRC32 library functions to arch-optimized code [01/15] lib/crc32: drop leading underscores from __crc32c_le_base [02/15] lib/crc32: improve support for arch-specific overrides [03/15] arm/crc32: expose CRC32 functions through lib [04/15] loongarch/crc32: expose CRC32 functions through lib [05/15] mips/crc32: expose CRC32 functions through lib [06/15] powerpc/crc32: expose CRC32 functions through lib [07/15] s390/crc32: expose CRC32 functions through lib [08/15] sparc/crc32: expose CRC32 functions through lib [09/15] x86/crc32: update prototype for crc_pcl() [10/15] x86/crc32: update prototype for crc32_pclmul_le_16() [11/15] x86/crc32: expose CRC32 functions through lib [12/15] lib/crc32: make crc32c() go directly to lib [13/15] ext4: switch to using the crc32c library [14/15] jbd2: switch to using the crc32c library [15/15] f2fs: switch to using the crc32 library

Context	Check	Description
conchuod/vmtest-fixes-PR	fail	merge-conflict

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 397edf05dd722..f80ea80d792f5 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1993,15 +1993,15 @@ config CPU_MIPSR5 select MIPS_SPRAM config CPU_MIPSR6 bool default y if CPU_MIPS32_R6 || CPU_MIPS64_R6 + select ARCH_HAS_CRC32 select CPU_HAS_RIXI select CPU_HAS_DIEI if !CPU_DIEI_BROKEN select HAVE_ARCH_BITREVERSE select MIPS_ASID_BITS_VARIABLE - select MIPS_CRC_SUPPORT select MIPS_SPRAM config TARGET_ISA_REV int default 1 if CPU_MIPSR1 @@ -2473,13 +2473,10 @@ config MIPS_ASID_BITS default 8 config MIPS_ASID_BITS_VARIABLE bool -config MIPS_CRC_SUPPORT - bool - # R4600 erratum. Due to the lack of errata information the exact # technical details aren't known. I've experimentally found that disabling # interrupts during indexed I-cache flushes seems to be sufficient to deal # with the issue. config WAR_R4600_V1_INDEX_ICACHEOP diff --git a/arch/mips/configs/eyeq5_defconfig b/arch/mips/configs/eyeq5_defconfig index ae9a09b16e40b..ff7af5dc6d9d3 100644 --- a/arch/mips/configs/eyeq5_defconfig +++ b/arch/mips/configs/eyeq5_defconfig @@ -97,11 +97,10 @@ CONFIG_NFS_FS=y CONFIG_NFS_V3_ACL=y CONFIG_NFS_V4=y CONFIG_NFS_V4_1=y CONFIG_NFS_V4_2=y CONFIG_ROOT_NFS=y -CONFIG_CRYPTO_CRC32_MIPS=y CONFIG_FRAME_WARN=1024 CONFIG_DEBUG_FS=y # CONFIG_RCU_TRACE is not set # CONFIG_FTRACE is not set CONFIG_CMDLINE_BOOL=y diff --git a/arch/mips/configs/eyeq6_defconfig b/arch/mips/configs/eyeq6_defconfig index 6597d5e88b335..0afbb45a78e8e 100644 --- a/arch/mips/configs/eyeq6_defconfig +++ b/arch/mips/configs/eyeq6_defconfig @@ -100,11 +100,10 @@ CONFIG_NFS_FS=y CONFIG_NFS_V3_ACL=y CONFIG_NFS_V4=y CONFIG_NFS_V4_1=y CONFIG_NFS_V4_2=y CONFIG_ROOT_NFS=y -CONFIG_CRYPTO_CRC32_MIPS=y CONFIG_FRAME_WARN=1024 CONFIG_DEBUG_FS=y # CONFIG_RCU_TRACE is not set # CONFIG_FTRACE is not set CONFIG_CMDLINE_BOOL=y diff --git a/arch/mips/configs/generic/32r6.config b/arch/mips/configs/generic/32r6.config index 1a5d5ea4ab2b5..ca606e71f4d02 100644 --- a/arch/mips/configs/generic/32r6.config +++ b/arch/mips/configs/generic/32r6.config @@ -1,4 +1,2 @@ CONFIG_CPU_MIPS32_R6=y CONFIG_HIGHMEM=y - -CONFIG_CRYPTO_CRC32_MIPS=y diff --git a/arch/mips/configs/generic/64r6.config b/arch/mips/configs/generic/64r6.config index 63b4e95f303de..23a3009149570 100644 --- a/arch/mips/configs/generic/64r6.config +++ b/arch/mips/configs/generic/64r6.config @@ -2,7 +2,6 @@ CONFIG_CPU_MIPS64_R6=y CONFIG_64BIT=y CONFIG_MIPS32_O32=y CONFIG_MIPS32_N32=y CONFIG_CPU_HAS_MSA=y -CONFIG_CRYPTO_CRC32_MIPS=y CONFIG_VIRTUALIZATION=y diff --git a/arch/mips/crypto/Kconfig b/arch/mips/crypto/Kconfig index 9003a5c1e879f..7decd40c4e204 100644 --- a/arch/mips/crypto/Kconfig +++ b/arch/mips/crypto/Kconfig @@ -1,18 +1,9 @@ # SPDX-License-Identifier: GPL-2.0 menu "Accelerated Cryptographic Algorithms for CPU (mips)" -config CRYPTO_CRC32_MIPS - tristate "CRC32c and CRC32" - depends on MIPS_CRC_SUPPORT - select CRYPTO_HASH - help - CRC32c and CRC32 CRC algorithms - - Architecture: mips - config CRYPTO_POLY1305_MIPS tristate "Hash functions: Poly1305" depends on MIPS select CRYPTO_ARCH_HAVE_LIB_POLY1305 help diff --git a/arch/mips/crypto/Makefile b/arch/mips/crypto/Makefile index 5e4105cccf9fa..fddc882814123 100644 --- a/arch/mips/crypto/Makefile +++ b/arch/mips/crypto/Makefile @@ -1,12 +1,10 @@ # SPDX-License-Identifier: GPL-2.0 # # Makefile for MIPS crypto files.. # -obj-$(CONFIG_CRYPTO_CRC32_MIPS) += crc32-mips.o - obj-$(CONFIG_CRYPTO_CHACHA_MIPS) += chacha-mips.o chacha-mips-y := chacha-core.o chacha-glue.o AFLAGS_chacha-core.o += -O2 # needed to fill branch delay slots obj-$(CONFIG_CRYPTO_POLY1305_MIPS) += poly1305-mips.o diff --git a/arch/mips/crypto/crc32-mips.c b/arch/mips/crypto/crc32-mips.c deleted file mode 100644 index 90eacf00cfc31..0000000000000 --- a/arch/mips/crypto/crc32-mips.c +++ /dev/null @@ -1,354 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions - * - * Module based on arm64/crypto/crc32-arm.c - * - * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org> - * Copyright (C) 2018 MIPS Tech, LLC - */ - -#include <linux/cpufeature.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/string.h> -#include <asm/mipsregs.h> -#include <linux/unaligned.h> - -#include <crypto/internal/hash.h> - -enum crc_op_size { - b, h, w, d, -}; - -enum crc_type { - crc32, - crc32c, -}; - -#ifndef TOOLCHAIN_SUPPORTS_CRC -#define _ASM_SET_CRC(OP, SZ, TYPE) \ -_ASM_MACRO_3R(OP, rt, rs, rt2, \ - ".ifnc \\rt, \\rt2\n\t" \ - ".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \ - ".endif\n\t" \ - _ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \ - ((SZ) << 6) | ((TYPE) << 8)) \ - _ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \ - ((SZ) << 14) | ((TYPE) << 3))) -#define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t" -#else /* !TOOLCHAIN_SUPPORTS_CRC */ -#define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t" -#define _ASM_UNSET_CRC(op, SZ, TYPE) -#endif - -#define __CRC32(crc, value, op, SZ, TYPE) \ -do { \ - __asm__ __volatile__( \ - ".set push\n\t" \ - _ASM_SET_CRC(op, SZ, TYPE) \ - #op " %0, %1, %0\n\t" \ - _ASM_UNSET_CRC(op, SZ, TYPE) \ - ".set pop" \ - : "+r" (crc) \ - : "r" (value)); \ -} while (0) - -#define _CRC32_crc32b(crc, value) __CRC32(crc, value, crc32b, 0, 0) -#define _CRC32_crc32h(crc, value) __CRC32(crc, value, crc32h, 1, 0) -#define _CRC32_crc32w(crc, value) __CRC32(crc, value, crc32w, 2, 0) -#define _CRC32_crc32d(crc, value) __CRC32(crc, value, crc32d, 3, 0) -#define _CRC32_crc32cb(crc, value) __CRC32(crc, value, crc32cb, 0, 1) -#define _CRC32_crc32ch(crc, value) __CRC32(crc, value, crc32ch, 1, 1) -#define _CRC32_crc32cw(crc, value) __CRC32(crc, value, crc32cw, 2, 1) -#define _CRC32_crc32cd(crc, value) __CRC32(crc, value, crc32cd, 3, 1) - -#define _CRC32(crc, value, size, op) \ - _CRC32_##op##size(crc, value) - -#define CRC32(crc, value, size) \ - _CRC32(crc, value, size, crc32) - -#define CRC32C(crc, value, size) \ - _CRC32(crc, value, size, crc32c) - -static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len) -{ - u32 crc = crc_; - - if (IS_ENABLED(CONFIG_64BIT)) { - for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) { - u64 value = get_unaligned_le64(p); - - CRC32(crc, value, d); - } - - if (len & sizeof(u32)) { - u32 value = get_unaligned_le32(p); - - CRC32(crc, value, w); - p += sizeof(u32); - } - } else { - for (; len >= sizeof(u32); len -= sizeof(u32)) { - u32 value = get_unaligned_le32(p); - - CRC32(crc, value, w); - p += sizeof(u32); - } - } - - if (len & sizeof(u16)) { - u16 value = get_unaligned_le16(p); - - CRC32(crc, value, h); - p += sizeof(u16); - } - - if (len & sizeof(u8)) { - u8 value = *p++; - - CRC32(crc, value, b); - } - - return crc; -} - -static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len) -{ - u32 crc = crc_; - - if (IS_ENABLED(CONFIG_64BIT)) { - for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) { - u64 value = get_unaligned_le64(p); - - CRC32C(crc, value, d); - } - - if (len & sizeof(u32)) { - u32 value = get_unaligned_le32(p); - - CRC32C(crc, value, w); - p += sizeof(u32); - } - } else { - for (; len >= sizeof(u32); len -= sizeof(u32)) { - u32 value = get_unaligned_le32(p); - - CRC32C(crc, value, w); - p += sizeof(u32); - } - } - - if (len & sizeof(u16)) { - u16 value = get_unaligned_le16(p); - - CRC32C(crc, value, h); - p += sizeof(u16); - } - - if (len & sizeof(u8)) { - u8 value = *p++; - - CRC32C(crc, value, b); - } - return crc; -} - -#define CHKSUM_BLOCK_SIZE 1 -#define CHKSUM_DIGEST_SIZE 4 - -struct chksum_ctx { - u32 key; -}; - -struct chksum_desc_ctx { - u32 crc; -}; - -static int chksum_init(struct shash_desc *desc) -{ - struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - ctx->crc = mctx->key; - - return 0; -} - -/* - * Setting the seed allows arbitrary accumulators and flexible XOR policy - * If your algorithm starts with ~0, then XOR with ~0 before you set - * the seed. - */ -static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, - unsigned int keylen) -{ - struct chksum_ctx *mctx = crypto_shash_ctx(tfm); - - if (keylen != sizeof(mctx->key)) - return -EINVAL; - mctx->key = get_unaligned_le32(key); - return 0; -} - -static int chksum_update(struct shash_desc *desc, const u8 *data, - unsigned int length) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - ctx->crc = crc32_mips_le_hw(ctx->crc, data, length); - return 0; -} - -static int chksumc_update(struct shash_desc *desc, const u8 *data, - unsigned int length) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length); - return 0; -} - -static int chksum_final(struct shash_desc *desc, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - put_unaligned_le32(ctx->crc, out); - return 0; -} - -static int chksumc_final(struct shash_desc *desc, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - put_unaligned_le32(~ctx->crc, out); - return 0; -} - -static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out) -{ - put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out); - return 0; -} - -static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out) -{ - put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out); - return 0; -} - -static int chksum_finup(struct shash_desc *desc, const u8 *data, - unsigned int len, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - return __chksum_finup(ctx->crc, data, len, out); -} - -static int chksumc_finup(struct shash_desc *desc, const u8 *data, - unsigned int len, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - return __chksumc_finup(ctx->crc, data, len, out); -} - -static int chksum_digest(struct shash_desc *desc, const u8 *data, - unsigned int length, u8 *out) -{ - struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); - - return __chksum_finup(mctx->key, data, length, out); -} - -static int chksumc_digest(struct shash_desc *desc, const u8 *data, - unsigned int length, u8 *out) -{ - struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); - - return __chksumc_finup(mctx->key, data, length, out); -} - -static int chksum_cra_init(struct crypto_tfm *tfm) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - mctx->key = ~0; - return 0; -} - -static struct shash_alg crc32_alg = { - .digestsize = CHKSUM_DIGEST_SIZE, - .setkey = chksum_setkey, - .init = chksum_init, - .update = chksum_update, - .final = chksum_final, - .finup = chksum_finup, - .digest = chksum_digest, - .descsize = sizeof(struct chksum_desc_ctx), - .base = { - .cra_name = "crc32", - .cra_driver_name = "crc32-mips-hw", - .cra_priority = 300, - .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, - .cra_blocksize = CHKSUM_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct chksum_ctx), - .cra_module = THIS_MODULE, - .cra_init = chksum_cra_init, - } -}; - -static struct shash_alg crc32c_alg = { - .digestsize = CHKSUM_DIGEST_SIZE, - .setkey = chksum_setkey, - .init = chksum_init, - .update = chksumc_update, - .final = chksumc_final, - .finup = chksumc_finup, - .digest = chksumc_digest, - .descsize = sizeof(struct chksum_desc_ctx), - .base = { - .cra_name = "crc32c", - .cra_driver_name = "crc32c-mips-hw", - .cra_priority = 300, - .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, - .cra_blocksize = CHKSUM_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct chksum_ctx), - .cra_module = THIS_MODULE, - .cra_init = chksum_cra_init, - } -}; - -static int __init crc32_mod_init(void) -{ - int err; - - err = crypto_register_shash(&crc32_alg); - - if (err) - return err; - - err = crypto_register_shash(&crc32c_alg); - - if (err) { - crypto_unregister_shash(&crc32_alg); - return err; - } - - return 0; -} - -static void __exit crc32_mod_exit(void) -{ - crypto_unregister_shash(&crc32_alg); - crypto_unregister_shash(&crc32c_alg); -} - -MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com"); -MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions"); -MODULE_LICENSE("GPL v2"); - -module_cpu_feature_match(MIPS_CRC32, crc32_mod_init); -module_exit(crc32_mod_exit); diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile index 5d5b993cbc2bf..9c024e6d5e54c 100644 --- a/arch/mips/lib/Makefile +++ b/arch/mips/lib/Makefile @@ -12,7 +12,9 @@ obj-$(CONFIG_PCI) += iomap-pci.o lib-$(CONFIG_GENERIC_CSUM) := $(filter-out csum_partial.o, $(lib-y)) obj-$(CONFIG_CPU_GENERIC_DUMP_TLB) += dump_tlb.o obj-$(CONFIG_CPU_R3000) += r3k_dump_tlb.o +obj-$(CONFIG_CRC32_ARCH) += crc32-mips.o + # libgcc-style stuff needed in the kernel obj-y += bswapsi.o bswapdi.o multi3.o diff --git a/arch/mips/lib/crc32-mips.c b/arch/mips/lib/crc32-mips.c new file mode 100644 index 0000000000000..3ff43031e12c0 --- /dev/null +++ b/arch/mips/lib/crc32-mips.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions + * + * Module based on arm64/crypto/crc32-arm.c + * + * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org> + * Copyright (C) 2018 MIPS Tech, LLC + */ + +#include <linux/cpufeature.h> +#include <linux/crc32.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <asm/mipsregs.h> +#include <linux/unaligned.h> + +enum crc_op_size { + b, h, w, d, +}; + +enum crc_type { + crc32, + crc32c, +}; + +#ifndef TOOLCHAIN_SUPPORTS_CRC +#define _ASM_SET_CRC(OP, SZ, TYPE) \ +_ASM_MACRO_3R(OP, rt, rs, rt2, \ + ".ifnc \\rt, \\rt2\n\t" \ + ".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \ + ".endif\n\t" \ + _ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \ + ((SZ) << 6) | ((TYPE) << 8)) \ + _ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \ + ((SZ) << 14) | ((TYPE) << 3))) +#define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t" +#else /* !TOOLCHAIN_SUPPORTS_CRC */ +#define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t" +#define _ASM_UNSET_CRC(op, SZ, TYPE) +#endif + +#define __CRC32(crc, value, op, SZ, TYPE) \ +do { \ + __asm__ __volatile__( \ + ".set push\n\t" \ + _ASM_SET_CRC(op, SZ, TYPE) \ + #op " %0, %1, %0\n\t" \ + _ASM_UNSET_CRC(op, SZ, TYPE) \ + ".set pop" \ + : "+r" (crc) \ + : "r" (value)); \ +} while (0) + +#define _CRC32_crc32b(crc, value) __CRC32(crc, value, crc32b, 0, 0) +#define _CRC32_crc32h(crc, value) __CRC32(crc, value, crc32h, 1, 0) +#define _CRC32_crc32w(crc, value) __CRC32(crc, value, crc32w, 2, 0) +#define _CRC32_crc32d(crc, value) __CRC32(crc, value, crc32d, 3, 0) +#define _CRC32_crc32cb(crc, value) __CRC32(crc, value, crc32cb, 0, 1) +#define _CRC32_crc32ch(crc, value) __CRC32(crc, value, crc32ch, 1, 1) +#define _CRC32_crc32cw(crc, value) __CRC32(crc, value, crc32cw, 2, 1) +#define _CRC32_crc32cd(crc, value) __CRC32(crc, value, crc32cd, 3, 1) + +#define _CRC32(crc, value, size, op) \ + _CRC32_##op##size(crc, value) + +#define CRC32(crc, value, size) \ + _CRC32(crc, value, size, crc32) + +#define CRC32C(crc, value, size) \ + _CRC32(crc, value, size, crc32c) + +static DEFINE_STATIC_KEY_FALSE(have_crc32); + +u32 crc32_le_arch(u32 crc, const u8 *p, size_t len) +{ + if (!static_branch_likely(&have_crc32)) + return crc32_le_base(crc, p, len); + + if (IS_ENABLED(CONFIG_64BIT)) { + for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) { + u64 value = get_unaligned_le64(p); + + CRC32(crc, value, d); + } + + if (len & sizeof(u32)) { + u32 value = get_unaligned_le32(p); + + CRC32(crc, value, w); + p += sizeof(u32); + } + } else { + for (; len >= sizeof(u32); len -= sizeof(u32)) { + u32 value = get_unaligned_le32(p); + + CRC32(crc, value, w); + p += sizeof(u32); + } + } + + if (len & sizeof(u16)) { + u16 value = get_unaligned_le16(p); + + CRC32(crc, value, h); + p += sizeof(u16); + } + + if (len & sizeof(u8)) { + u8 value = *p++; + + CRC32(crc, value, b); + } + + return crc; +} +EXPORT_SYMBOL(crc32_le_arch); + +u32 crc32c_le_arch(u32 crc, const u8 *p, size_t len) +{ + if (!static_branch_likely(&have_crc32)) + return crc32c_le_base(crc, p, len); + + if (IS_ENABLED(CONFIG_64BIT)) { + for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) { + u64 value = get_unaligned_le64(p); + + CRC32C(crc, value, d); + } + + if (len & sizeof(u32)) { + u32 value = get_unaligned_le32(p); + + CRC32C(crc, value, w); + p += sizeof(u32); + } + } else { + for (; len >= sizeof(u32); len -= sizeof(u32)) { + u32 value = get_unaligned_le32(p); + + CRC32C(crc, value, w); + p += sizeof(u32); + } + } + + if (len & sizeof(u16)) { + u16 value = get_unaligned_le16(p); + + CRC32C(crc, value, h); + p += sizeof(u16); + } + + if (len & sizeof(u8)) { + u8 value = *p++; + + CRC32C(crc, value, b); + } + return crc; +} +EXPORT_SYMBOL(crc32c_le_arch); + +u32 crc32_be_arch(u32 crc, const u8 *p, size_t len) +{ + return crc32_be_base(crc, p, len); +} +EXPORT_SYMBOL(crc32_be_arch); + +static int __init crc32_mips_init(void) +{ + if (cpu_have_feature(cpu_feature(MIPS_CRC32))) + static_branch_enable(&have_crc32); + return 0; +} +arch_initcall(crc32_mips_init); + +static void __exit crc32_mips_exit(void) +{ +} +module_exit(crc32_mips_exit); + +MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com"); +MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions"); +MODULE_LICENSE("GPL v2");

[05/15] mips/crc32: expose CRC32 functions through lib

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