lib/crc: mips: Migrate optimized CRC code into lib/crc/

Move the mips-optimized CRC code from arch/mips/lib/crc* into its new
location in lib/crc/mips/, and wire it up in the new way.  This new way
of organizing the CRC code eliminates the need to artificially split the
code for each CRC variant into separate arch and generic modules,
enabling better inlining and dead code elimination.  For more details,
see "lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/".

Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20250607200454.73587-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

3 files changed, 0 insertions, 186 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1e48184ecf1e..934eb961bd0d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2024,7 +2024,6 @@ config CPU_MIPSR5
 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
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 9d75845ef78e..8c40ffb09c42 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -16,7 +16,5 @@ 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
deleted file mode 100644
index 45e4d2c9fbf5..000000000000
--- a/arch/mips/lib/crc32-mips.c
+++ /dev/null
@@ -1,183 +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/crc32.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <asm/mipsregs.h>
-#include <linux/unaligned.h>
-
-#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 __ro_after_init 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_arch(u32 crc, const u8 *p, size_t len)
-{
-	if (!static_branch_likely(&have_crc32))
-		return crc32c_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_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;
-}
-subsys_initcall(crc32_mips_init);
-
-static void __exit crc32_mips_exit(void)
-{
-}
-module_exit(crc32_mips_exit);
-
-u32 crc32_optimizations(void)
-{
-	if (static_key_enabled(&have_crc32))
-		return CRC32_LE_OPTIMIZATION | CRC32C_OPTIMIZATION;
-	return 0;
-}
-EXPORT_SYMBOL(crc32_optimizations);
-
-MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
-MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
-MODULE_LICENSE("GPL v2");