/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or https://opensource.org/licenses/CDDL-1.0. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2006 Sun Microsystems, Inc. All rights reserved. * Copyright (c) 2022 Tino Reichardt */ #ifndef _LIBSPL_SYS_SIMD_H #define _LIBSPL_SYS_SIMD_H #include #include #if defined(__x86) #include #define kfpu_allowed() 1 #define kfpu_begin() do {} while (0) #define kfpu_end() do {} while (0) #define kfpu_init() 0 #define kfpu_fini() ((void) 0) /* * CPUID feature tests for user-space. * * x86 registers used implicitly by CPUID */ typedef enum cpuid_regs { EAX = 0, EBX, ECX, EDX, CPUID_REG_CNT = 4 } cpuid_regs_t; /* * List of instruction sets identified by CPUID */ typedef enum cpuid_inst_sets { SSE = 0, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2, OSXSAVE, AVX, AVX2, BMI1, BMI2, AVX512F, AVX512CD, AVX512DQ, AVX512BW, AVX512IFMA, AVX512VBMI, AVX512PF, AVX512ER, AVX512VL, AES, PCLMULQDQ, MOVBE } cpuid_inst_sets_t; /* * Instruction set descriptor. */ typedef struct cpuid_feature_desc { uint32_t leaf; /* CPUID leaf */ uint32_t subleaf; /* CPUID sub-leaf */ uint32_t flag; /* bit mask of the feature */ cpuid_regs_t reg; /* which CPUID return register to test */ } cpuid_feature_desc_t; #define _AVX512F_BIT (1U << 16) #define _AVX512CD_BIT (_AVX512F_BIT | (1U << 28)) #define _AVX512DQ_BIT (_AVX512F_BIT | (1U << 17)) #define _AVX512BW_BIT (_AVX512F_BIT | (1U << 30)) #define _AVX512IFMA_BIT (_AVX512F_BIT | (1U << 21)) #define _AVX512VBMI_BIT (1U << 1) /* AVX512F_BIT is on another leaf */ #define _AVX512PF_BIT (_AVX512F_BIT | (1U << 26)) #define _AVX512ER_BIT (_AVX512F_BIT | (1U << 27)) #define _AVX512VL_BIT (1U << 31) /* if used also check other levels */ #define _AES_BIT (1U << 25) #define _PCLMULQDQ_BIT (1U << 1) #define _MOVBE_BIT (1U << 22) /* * Descriptions of supported instruction sets */ static const cpuid_feature_desc_t cpuid_features[] = { [SSE] = {1U, 0U, 1U << 25, EDX }, [SSE2] = {1U, 0U, 1U << 26, EDX }, [SSE3] = {1U, 0U, 1U << 0, ECX }, [SSSE3] = {1U, 0U, 1U << 9, ECX }, [SSE4_1] = {1U, 0U, 1U << 19, ECX }, [SSE4_2] = {1U, 0U, 1U << 20, ECX }, [OSXSAVE] = {1U, 0U, 1U << 27, ECX }, [AVX] = {1U, 0U, 1U << 28, ECX }, [AVX2] = {7U, 0U, 1U << 5, EBX }, [BMI1] = {7U, 0U, 1U << 3, EBX }, [BMI2] = {7U, 0U, 1U << 8, EBX }, [AVX512F] = {7U, 0U, _AVX512F_BIT, EBX }, [AVX512CD] = {7U, 0U, _AVX512CD_BIT, EBX }, [AVX512DQ] = {7U, 0U, _AVX512DQ_BIT, EBX }, [AVX512BW] = {7U, 0U, _AVX512BW_BIT, EBX }, [AVX512IFMA] = {7U, 0U, _AVX512IFMA_BIT, EBX }, [AVX512VBMI] = {7U, 0U, _AVX512VBMI_BIT, ECX }, [AVX512PF] = {7U, 0U, _AVX512PF_BIT, EBX }, [AVX512ER] = {7U, 0U, _AVX512ER_BIT, EBX }, [AVX512VL] = {7U, 0U, _AVX512ER_BIT, EBX }, [AES] = {1U, 0U, _AES_BIT, ECX }, [PCLMULQDQ] = {1U, 0U, _PCLMULQDQ_BIT, ECX }, [MOVBE] = {1U, 0U, _MOVBE_BIT, ECX }, }; /* * Check if OS supports AVX and AVX2 by checking XCR0 * Only call this function if CPUID indicates that AVX feature is * supported by the CPU, otherwise it might be an illegal instruction. */ static inline uint64_t xgetbv(uint32_t index) { uint32_t eax, edx; /* xgetbv - instruction byte code */ __asm__ __volatile__(".byte 0x0f; .byte 0x01; .byte 0xd0" : "=a" (eax), "=d" (edx) : "c" (index)); return ((((uint64_t)edx)<<32) | (uint64_t)eax); } /* * Check if CPU supports a feature */ static inline boolean_t __cpuid_check_feature(const cpuid_feature_desc_t *desc) { uint32_t r[CPUID_REG_CNT]; if (__get_cpuid_max(0, NULL) >= desc->leaf) { /* * __cpuid_count is needed to properly check * for AVX2. It is a macro, so return parameters * are passed by value. */ __cpuid_count(desc->leaf, desc->subleaf, r[EAX], r[EBX], r[ECX], r[EDX]); return ((r[desc->reg] & desc->flag) == desc->flag); } return (B_FALSE); } #define CPUID_FEATURE_CHECK(name, id) \ static inline boolean_t \ __cpuid_has_ ## name(void) \ { \ return (__cpuid_check_feature(&cpuid_features[id])); \ } /* * Define functions for user-space CPUID features testing */ CPUID_FEATURE_CHECK(sse, SSE); CPUID_FEATURE_CHECK(sse2, SSE2); CPUID_FEATURE_CHECK(sse3, SSE3); CPUID_FEATURE_CHECK(ssse3, SSSE3); CPUID_FEATURE_CHECK(sse4_1, SSE4_1); CPUID_FEATURE_CHECK(sse4_2, SSE4_2); CPUID_FEATURE_CHECK(avx, AVX); CPUID_FEATURE_CHECK(avx2, AVX2); CPUID_FEATURE_CHECK(osxsave, OSXSAVE); CPUID_FEATURE_CHECK(bmi1, BMI1); CPUID_FEATURE_CHECK(bmi2, BMI2); CPUID_FEATURE_CHECK(avx512f, AVX512F); CPUID_FEATURE_CHECK(avx512cd, AVX512CD); CPUID_FEATURE_CHECK(avx512dq, AVX512DQ); CPUID_FEATURE_CHECK(avx512bw, AVX512BW); CPUID_FEATURE_CHECK(avx512ifma, AVX512IFMA); CPUID_FEATURE_CHECK(avx512vbmi, AVX512VBMI); CPUID_FEATURE_CHECK(avx512pf, AVX512PF); CPUID_FEATURE_CHECK(avx512er, AVX512ER); CPUID_FEATURE_CHECK(avx512vl, AVX512VL); CPUID_FEATURE_CHECK(aes, AES); CPUID_FEATURE_CHECK(pclmulqdq, PCLMULQDQ); CPUID_FEATURE_CHECK(movbe, MOVBE); /* * Detect register set support */ static inline boolean_t __simd_state_enabled(const uint64_t state) { boolean_t has_osxsave; uint64_t xcr0; has_osxsave = __cpuid_has_osxsave(); if (!has_osxsave) return (B_FALSE); xcr0 = xgetbv(0); return ((xcr0 & state) == state); } #define _XSTATE_SSE_AVX (0x2 | 0x4) #define _XSTATE_AVX512 (0xE0 | _XSTATE_SSE_AVX) #define __ymm_enabled() __simd_state_enabled(_XSTATE_SSE_AVX) #define __zmm_enabled() __simd_state_enabled(_XSTATE_AVX512) /* * Check if SSE instruction set is available */ static inline boolean_t zfs_sse_available(void) { return (__cpuid_has_sse()); } /* * Check if SSE2 instruction set is available */ static inline boolean_t zfs_sse2_available(void) { return (__cpuid_has_sse2()); } /* * Check if SSE3 instruction set is available */ static inline boolean_t zfs_sse3_available(void) { return (__cpuid_has_sse3()); } /* * Check if SSSE3 instruction set is available */ static inline boolean_t zfs_ssse3_available(void) { return (__cpuid_has_ssse3()); } /* * Check if SSE4.1 instruction set is available */ static inline boolean_t zfs_sse4_1_available(void) { return (__cpuid_has_sse4_1()); } /* * Check if SSE4.2 instruction set is available */ static inline boolean_t zfs_sse4_2_available(void) { return (__cpuid_has_sse4_2()); } /* * Check if AVX instruction set is available */ static inline boolean_t zfs_avx_available(void) { return (__cpuid_has_avx() && __ymm_enabled()); } /* * Check if AVX2 instruction set is available */ static inline boolean_t zfs_avx2_available(void) { return (__cpuid_has_avx2() && __ymm_enabled()); } /* * Check if BMI1 instruction set is available */ static inline boolean_t zfs_bmi1_available(void) { return (__cpuid_has_bmi1()); } /* * Check if BMI2 instruction set is available */ static inline boolean_t zfs_bmi2_available(void) { return (__cpuid_has_bmi2()); } /* * Check if AES instruction set is available */ static inline boolean_t zfs_aes_available(void) { return (__cpuid_has_aes()); } /* * Check if PCLMULQDQ instruction set is available */ static inline boolean_t zfs_pclmulqdq_available(void) { return (__cpuid_has_pclmulqdq()); } /* * Check if MOVBE instruction is available */ static inline boolean_t zfs_movbe_available(void) { return (__cpuid_has_movbe()); } /* * AVX-512 family of instruction sets: * * AVX512F Foundation * AVX512CD Conflict Detection Instructions * AVX512ER Exponential and Reciprocal Instructions * AVX512PF Prefetch Instructions * * AVX512BW Byte and Word Instructions * AVX512DQ Double-word and Quadword Instructions * AVX512VL Vector Length Extensions * * AVX512IFMA Integer Fused Multiply Add (Not supported by kernel 4.4) * AVX512VBMI Vector Byte Manipulation Instructions */ /* * Check if AVX512F instruction set is available */ static inline boolean_t zfs_avx512f_available(void) { return (__cpuid_has_avx512f() && __zmm_enabled()); } /* * Check if AVX512CD instruction set is available */ static inline boolean_t zfs_avx512cd_available(void) { return (__cpuid_has_avx512cd() && __zmm_enabled()); } /* * Check if AVX512ER instruction set is available */ static inline boolean_t zfs_avx512er_available(void) { return (__cpuid_has_avx512er() && __zmm_enabled()); } /* * Check if AVX512PF instruction set is available */ static inline boolean_t zfs_avx512pf_available(void) { return (__cpuid_has_avx512pf() && __zmm_enabled()); } /* * Check if AVX512BW instruction set is available */ static inline boolean_t zfs_avx512bw_available(void) { return (__cpuid_has_avx512bw() && __zmm_enabled()); } /* * Check if AVX512DQ instruction set is available */ static inline boolean_t zfs_avx512dq_available(void) { return (__cpuid_has_avx512dq() && __zmm_enabled()); } /* * Check if AVX512VL instruction set is available */ static inline boolean_t zfs_avx512vl_available(void) { return (__cpuid_has_avx512vl() && __zmm_enabled()); } /* * Check if AVX512IFMA instruction set is available */ static inline boolean_t zfs_avx512ifma_available(void) { return (__cpuid_has_avx512ifma() && __zmm_enabled()); } /* * Check if AVX512VBMI instruction set is available */ static inline boolean_t zfs_avx512vbmi_available(void) { return (__cpuid_has_avx512f() && __cpuid_has_avx512vbmi() && __zmm_enabled()); } #elif defined(__aarch64__) #define kfpu_allowed() 1 #define kfpu_initialize(tsk) do {} while (0) #define kfpu_begin() do {} while (0) #define kfpu_end() do {} while (0) #elif defined(__powerpc__) /* including clashes with AT_UID and others */ extern unsigned long getauxval(unsigned long type); #if defined(__FreeBSD__) #define AT_HWCAP 25 /* CPU feature flags. */ #define AT_HWCAP2 26 /* CPU feature flags 2. */ extern int elf_aux_info(int aux, void *buf, int buflen); static unsigned long getauxval(unsigned long key) { unsigned long val = 0UL; if (elf_aux_info((int)key, &val, sizeof (val)) != 0) return (0UL); return (val); } #elif defined(__linux__) #define AT_HWCAP 16 /* CPU feature flags. */ #define AT_HWCAP2 26 /* CPU feature flags 2. */ #endif #define kfpu_allowed() 1 #define kfpu_initialize(tsk) do {} while (0) #define kfpu_begin() do {} while (0) #define kfpu_end() do {} while (0) #define PPC_FEATURE_HAS_ALTIVEC 0x10000000 static inline boolean_t zfs_altivec_available(void) { unsigned long hwcap = getauxval(AT_HWCAP); return (hwcap & PPC_FEATURE_HAS_ALTIVEC); } #define PPC_FEATURE_HAS_VSX 0x00000080 static inline boolean_t zfs_vsx_available(void) { unsigned long hwcap = getauxval(AT_HWCAP); return (hwcap & PPC_FEATURE_HAS_VSX); } #define PPC_FEATURE2_ARCH_2_07 0x80000000 static inline boolean_t zfs_isa207_available(void) { unsigned long hwcap = getauxval(AT_HWCAP); unsigned long hwcap2 = getauxval(AT_HWCAP2); return ((hwcap & PPC_FEATURE_HAS_VSX) && (hwcap2 & PPC_FEATURE2_ARCH_2_07)); } #else #define kfpu_allowed() 0 #define kfpu_initialize(tsk) do {} while (0) #define kfpu_begin() do {} while (0) #define kfpu_end() do {} while (0) #endif #endif /* _LIBSPL_SYS_SIMD_H */