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

Move the sparc-optimized CRC code from arch/sparc/lib/crc* into its new
location in lib/crc/sparc/, 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/20250607200454.73587-11-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

3 files changed, 0 insertions, 115 deletions

diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
index 5cf9781d68b4..2d6c3c535273 100644
--- a/arch/sparc/lib/Makefile
+++ b/arch/sparc/lib/Makefile
@@ -54,5 +54,3 @@ lib-$(CONFIG_SPARC64) += mcount.o ipcsum.o xor.o hweight.o ffs.o
 obj-$(CONFIG_SPARC64) += iomap.o
 obj-$(CONFIG_SPARC32) += atomic32.o
 obj-$(CONFIG_SPARC64) += PeeCeeI.o
-obj-$(CONFIG_CRC32_ARCH) += crc32-sparc.o
-crc32-sparc-y := crc32.o crc32c_asm.o
diff --git a/arch/sparc/lib/crc32.c b/arch/sparc/lib/crc32.c
deleted file mode 100644
index 40d4720a42a1..000000000000
--- a/arch/sparc/lib/crc32.c
+++ /dev/null
@@ -1,93 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* CRC32c (Castagnoli), sparc64 crc32c opcode accelerated
- *
- * This is based largely upon arch/x86/crypto/crc32c-intel.c
- *
- * Copyright (C) 2008 Intel Corporation
- * Authors: Austin Zhang <austin_zhang@linux.intel.com>
- *          Kent Liu <kent.liu@intel.com>
- */
-
-#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/crc32.h>
-#include <asm/pstate.h>
-#include <asm/elf.h>
-
-static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32c_opcode);
-
-u32 crc32_le_arch(u32 crc, const u8 *data, size_t len)
-{
-	return crc32_le_base(crc, data, len);
-}
-EXPORT_SYMBOL(crc32_le_arch);
-
-void crc32c_sparc64(u32 *crcp, const u64 *data, size_t len);
-
-u32 crc32c_arch(u32 crc, const u8 *data, size_t len)
-{
-	size_t n = -(uintptr_t)data & 7;
-
-	if (!static_branch_likely(&have_crc32c_opcode))
-		return crc32c_base(crc, data, len);
-
-	if (n) {
-		/* Data isn't 8-byte aligned.  Align it. */
-		n = min(n, len);
-		crc = crc32c_base(crc, data, n);
-		data += n;
-		len -= n;
-	}
-	n = len & ~7U;
-	if (n) {
-		crc32c_sparc64(&crc, (const u64 *)data, n);
-		data += n;
-		len -= n;
-	}
-	if (len)
-		crc = crc32c_base(crc, data, len);
-	return crc;
-}
-EXPORT_SYMBOL(crc32c_arch);
-
-u32 crc32_be_arch(u32 crc, const u8 *data, size_t len)
-{
-	return crc32_be_base(crc, data, len);
-}
-EXPORT_SYMBOL(crc32_be_arch);
-
-static int __init crc32_sparc_init(void)
-{
-	unsigned long cfr;
-
-	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
-		return 0;
-
-	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
-	if (!(cfr & CFR_CRC32C))
-		return 0;
-
-	static_branch_enable(&have_crc32c_opcode);
-	pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
-	return 0;
-}
-subsys_initcall(crc32_sparc_init);
-
-static void __exit crc32_sparc_exit(void)
-{
-}
-module_exit(crc32_sparc_exit);
-
-u32 crc32_optimizations(void)
-{
-	if (static_key_enabled(&have_crc32c_opcode))
-		return CRC32C_OPTIMIZATION;
-	return 0;
-}
-EXPORT_SYMBOL(crc32_optimizations);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
diff --git a/arch/sparc/lib/crc32c_asm.S b/arch/sparc/lib/crc32c_asm.S
deleted file mode 100644
index 4db873850f44..000000000000
--- a/arch/sparc/lib/crc32c_asm.S
+++ /dev/null
@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#include <linux/linkage.h>
-#include <asm/opcodes.h>
-#include <asm/visasm.h>
-#include <asm/asi.h>
-
-ENTRY(crc32c_sparc64)
-	/* %o0=crc32p, %o1=data_ptr, %o2=len */
-	VISEntryHalf
-	lda	[%o0] ASI_PL, %f1
-1:	ldd	[%o1], %f2
-	CRC32C(0,2,0)
-	subcc	%o2, 8, %o2
-	bne,pt	%icc, 1b
-	 add	%o1, 0x8, %o1
-	sta	%f1, [%o0] ASI_PL
-	VISExitHalf
-2:	retl
-	 nop
-ENDPROC(crc32c_sparc64)