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| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | #include <asm/simd.h> |
| 3 | #include <asm/switch_to.h> |
| 4 | #include <linux/cpufeature.h> |
| 5 | #include <linux/jump_label.h> |
| 6 | #include <linux/preempt.h> |
| 7 | #include <linux/uaccess.h> |
| 8 | |
| 9 | #define VMX_ALIGN 16 |
| 10 | #define VMX_ALIGN_MASK (VMX_ALIGN-1) |
| 11 | |
| 12 | #define VECTOR_BREAKPOINT 512 |
| 13 | |
| 14 | static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_vec_crypto); |
| 15 | |
| 16 | #define crc32_le_arch crc32_le_base /* not implemented on this arch */ |
| 17 | #define crc32_be_arch crc32_be_base /* not implemented on this arch */ |
| 18 | |
| 19 | u32 __crc32c_vpmsum(u32 crc, const u8 *p, size_t len); |
| 20 | |
| 21 | static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len) |
| 22 | { |
| 23 | unsigned int prealign; |
| 24 | unsigned int tail; |
| 25 | |
| 26 | if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) || |
| 27 | !static_branch_likely(&have_vec_crypto) || |
| 28 | unlikely(!may_use_simd())) |
| 29 | return crc32c_base(crc, p, len); |
| 30 | |
| 31 | if ((unsigned long)p & VMX_ALIGN_MASK) { |
| 32 | prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK); |
| 33 | crc = crc32c_base(crc, p, prealign); |
| 34 | len -= prealign; |
| 35 | p += prealign; |
| 36 | } |
| 37 | |
| 38 | if (len & ~VMX_ALIGN_MASK) { |
| 39 | preempt_disable(); |
| 40 | pagefault_disable(); |
| 41 | enable_kernel_altivec(); |
| 42 | crc = __crc32c_vpmsum(crc, p, len & ~VMX_ALIGN_MASK); |
| 43 | disable_kernel_altivec(); |
| 44 | pagefault_enable(); |
| 45 | preempt_enable(); |
| 46 | } |
| 47 | |
| 48 | tail = len & VMX_ALIGN_MASK; |
| 49 | if (tail) { |
| 50 | p += len & ~VMX_ALIGN_MASK; |
| 51 | crc = crc32c_base(crc, p, tail); |
| 52 | } |
| 53 | |
| 54 | return crc; |
| 55 | } |
| 56 | |
| 57 | #define crc32_mod_init_arch crc32_mod_init_arch |
| 58 | static void crc32_mod_init_arch(void) |
| 59 | { |
| 60 | if (cpu_has_feature(CPU_FTR_ARCH_207S) && |
| 61 | (cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO)) |
| 62 | static_branch_enable(&have_vec_crypto); |
| 63 | } |
| 64 | |
| 65 | static inline u32 crc32_optimizations_arch(void) |
| 66 | { |
| 67 | if (static_key_enabled(&have_vec_crypto)) |
| 68 | return CRC32C_OPTIMIZATION; |
| 69 | return 0; |
| 70 | } |
| 71 |
Warning: This file is not a C or C++ file. It does not have highlighting.