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190c253d86
Move the powerpc-optimized CRC code from arch/powerpc/lib/crc* into its new location in lib/crc/powerpc/, 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/20250607200454.73587-8-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <asm/switch_to.h>
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#include <crypto/internal/simd.h>
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#include <linux/cpufeature.h>
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#include <linux/jump_label.h>
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#include <linux/preempt.h>
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#include <linux/uaccess.h>
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#define VMX_ALIGN 16
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#define VMX_ALIGN_MASK (VMX_ALIGN-1)
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#define VECTOR_BREAKPOINT 512
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
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#define crc32_le_arch crc32_le_base /* not implemented on this arch */
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#define crc32_be_arch crc32_be_base /* not implemented on this arch */
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u32 __crc32c_vpmsum(u32 crc, const u8 *p, size_t len);
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static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
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{
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unsigned int prealign;
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unsigned int tail;
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if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) ||
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!static_branch_likely(&have_vec_crypto) || !crypto_simd_usable())
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return crc32c_base(crc, p, len);
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if ((unsigned long)p & VMX_ALIGN_MASK) {
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prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
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crc = crc32c_base(crc, p, prealign);
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len -= prealign;
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p += prealign;
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}
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if (len & ~VMX_ALIGN_MASK) {
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preempt_disable();
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pagefault_disable();
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enable_kernel_altivec();
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crc = __crc32c_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
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disable_kernel_altivec();
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pagefault_enable();
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preempt_enable();
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}
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tail = len & VMX_ALIGN_MASK;
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if (tail) {
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p += len & ~VMX_ALIGN_MASK;
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crc = crc32c_base(crc, p, tail);
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}
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return crc;
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}
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#define crc32_mod_init_arch crc32_mod_init_arch
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static inline void crc32_mod_init_arch(void)
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{
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if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
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(cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))
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static_branch_enable(&have_vec_crypto);
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}
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static inline u32 crc32_optimizations_arch(void)
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{
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if (static_key_enabled(&have_vec_crypto))
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return CRC32C_OPTIMIZATION;
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return 0;
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}
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