mirror of https://github.com/torvalds/linux.git
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/crc32.h>
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#include <crypto/internal/simd.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/cpufeature.h>
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#include <asm/simd.h>
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#include <asm/switch_to.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 DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
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u32 __crc32c_vpmsum(u32 crc, const u8 *p, size_t len);
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u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
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{
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return crc32_le_base(crc, p, len);
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}
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EXPORT_SYMBOL(crc32_le_arch);
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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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EXPORT_SYMBOL(crc32c_arch);
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u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
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{
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return crc32_be_base(crc, p, len);
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}
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EXPORT_SYMBOL(crc32_be_arch);
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static int __init crc32_powerpc_init(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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return 0;
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}
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arch_initcall(crc32_powerpc_init);
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static void __exit crc32_powerpc_exit(void)
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{
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}
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module_exit(crc32_powerpc_exit);
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u32 crc32_optimizations(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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EXPORT_SYMBOL(crc32_optimizations);
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MODULE_AUTHOR("Anton Blanchard <anton@samba.org>");
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MODULE_DESCRIPTION("CRC32C using vector polynomial multiply-sum instructions");
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MODULE_LICENSE("GPL");
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