OpenZFS restructuring - move platform specific headers

Move platform specific Linux headers under include/os/linux/.
Update the build system accordingly to detect the platform.
This lays some of the initial groundwork to supporting building
for other platforms.

As part of this change it was necessary to create both a user
and kernel space sys/simd.h header which can be included in
either context.  No functional change, the source has been
refactored and the relevant #include's updated.

Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Matthew Macy <mmacy@FreeBSD.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9198

config/always-system.m4

@@ -0,0 +1,26 @@
+dnl #
+dnl # Set the target system
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_SYSTEM], [
+	AC_MSG_CHECKING([for system type ($host_os)])
+	case $host_os in
+		*linux*)
+			AC_DEFINE([SYSTEM_LINUX], [1],
+				[True if ZFS is to be compiled for a Linux system])
+			ac_system="Linux"
+			;;
+		*freebsd*)
+			AC_DEFINE([SYSTEM_FREEBSD], [1],
+				[True if ZFS is to be compiled for a FreeBSD system])
+			ac_system="FreeBSD"
+			;;
+		*)
+			ac_system="unknown"
+			;;
+	esac
+	AC_MSG_RESULT([$ac_system])
+	AC_SUBST([ac_system])
+
+	AM_CONDITIONAL([BUILD_LINUX], [test "x$ac_system" = "xLinux"])
+	AM_CONDITIONAL([BUILD_FREEBSD], [test "x$ac_system" = "xFreeBSD"])
+])

config/zfs-build.m4

@@ -160,6 +160,7 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_OMIT_FRAME_POINTER
 	ZFS_AC_CONFIG_ALWAYS_CC_ASAN
 	ZFS_AC_CONFIG_ALWAYS_TOOLCHAIN_SIMD
+	ZFS_AC_CONFIG_ALWAYS_SYSTEM
 	ZFS_AC_CONFIG_ALWAYS_ARCH
 	ZFS_AC_CONFIG_ALWAYS_PYTHON
 	ZFS_AC_CONFIG_ALWAYS_PYZFS

configure.ac

@@ -146,10 +146,15 @@ AC_CONFIG_FILES([
 	module/icp/Makefile
 	module/spl/Makefile
 	include/Makefile
-	include/linux/Makefile
-	include/spl/Makefile
-	include/spl/rpc/Makefile
-	include/spl/sys/Makefile
+	include/os/Makefile
+	include/os/linux/Makefile
+	include/os/linux/kernel/Makefile
+	include/os/linux/kernel/linux/Makefile
+	include/os/linux/spl/Makefile
+	include/os/linux/spl/rpc/Makefile
+	include/os/linux/spl/sys/Makefile
+	include/os/linux/zfs/Makefile
+	include/os/linux/zfs/sys/Makefile
 	include/sys/Makefile
 	include/sys/fs/Makefile
 	include/sys/fm/Makefile

copy-builtin

@@ -62,7 +62,9 @@ EOF
 {
 	cat <<-"EOF"
 	ZFS_MODULE_CFLAGS  = -I$(srctree)/include/zfs
-	ZFS_MODULE_CFLAGS += -I$(srctree)/include/zfs/spl
+	ZFS_MODULE_CFLAGS += -I$(srctree)/include/zfs/os/linux/spl
+	ZFS_MODULE_CFLAGS += -I$(srctree)/include/zfs/os/linux/zfs
+	ZFS_MODULE_CFLAGS += -I$(srctree)/include/zfs/os/linux/kernel
 	ZFS_MODULE_CFLAGS += -include $(srctree)/include/zfs/zfs_config.h
 	ZFS_MODULE_CFLAGS += -std=gnu99 -Wno-declaration-after-statement
 	ZFS_MODULE_CPPFLAGS  = -D_KERNEL

include/.gitignore

@@ -1 +1,2 @@
 /zfs_gitrev.h
+/spl

include/Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = linux spl sys
+SUBDIRS = sys os
 
 COMMON_H = \
 	$(top_srcdir)/include/zfeature_common.h \

include/linux/Makefile.am

@@ -1,29 +0,0 @@
-COMMON_H =
-
-KERNEL_H = \
-	$(top_srcdir)/include/linux/dcache_compat.h \
-	$(top_srcdir)/include/linux/xattr_compat.h \
-	$(top_srcdir)/include/linux/vfs_compat.h \
-	$(top_srcdir)/include/linux/blkdev_compat.h \
-	$(top_srcdir)/include/linux/utsname_compat.h \
-	$(top_srcdir)/include/linux/kmap_compat.h \
-	$(top_srcdir)/include/linux/simd.h \
-	$(top_srcdir)/include/linux/simd_x86.h \
-	$(top_srcdir)/include/linux/simd_aarch64.h \
-	$(top_srcdir)/include/linux/mod_compat.h \
-	$(top_srcdir)/include/linux/page_compat.h \
-	$(top_srcdir)/include/linux/compiler_compat.h
-
-USER_H =
-
-EXTRA_DIST = $(COMMON_H) $(KERNEL_H) $(USER_H)
-
-if CONFIG_USER
-libzfsdir = $(includedir)/libzfs/linux
-libzfs_HEADERS = $(COMMON_H) $(USER_H)
-endif
-
-if CONFIG_KERNEL
-kerneldir = @prefix@/src/zfs-$(VERSION)/include/linux
-kernel_HEADERS = $(COMMON_H) $(KERNEL_H)
-endif

include/os/Makefile.am

@@ -0,0 +1,3 @@
+if BUILD_LINUX
+SUBDIRS = linux
+endif

include/os/linux/Makefile.am

@@ -0,0 +1 @@
+SUBDIRS = kernel spl zfs

include/os/linux/kernel/Makefile.am

@@ -0,0 +1 @@
+SUBDIRS = linux

include/os/linux/kernel/linux/Makefile.am

@@ -0,0 +1,29 @@
+COMMON_H =
+
+KERNEL_H = \
+	$(top_srcdir)/include/os/linux/kernel/linux/dcache_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/xattr_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/vfs_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/blkdev_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/utsname_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/kmap_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/simd.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/simd_x86.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/simd_aarch64.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/mod_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/page_compat.h \
+	$(top_srcdir)/include/os/linux/kernel/linux/compiler_compat.h
+
+USER_H =
+
+EXTRA_DIST = $(COMMON_H) $(KERNEL_H) $(USER_H)
+
+if CONFIG_USER
+libzfsdir = $(includedir)/libzfs/linux
+libzfs_HEADERS = $(COMMON_H) $(USER_H)
+endif
+
+if CONFIG_KERNEL
+kerneldir = @prefix@/src/zfs-$(VERSION)/include/linux
+kernel_HEADERS = $(COMMON_H) $(KERNEL_H)
+endif

include/os/linux/kernel/linux/simd.h

@@ -22,8 +22,8 @@
  * Copyright (C) 2019 Lawrence Livermore National Security, LLC.
  */
 
-#ifndef _SIMD_H
-#define	_SIMD_H
+#ifndef _LINUX_SIMD_H
+#define	_LINUX_SIMD_H
 
 #if defined(__x86)
 #include <linux/simd_x86.h>
@@ -32,10 +32,10 @@
 #include <linux/simd_aarch64.h>
 #else
 
-#define	kfpu_allowed()		1
+#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 /* _SIMD_H */
+#endif /* _LINUX_SIMD_H */

include/os/linux/kernel/linux/simd_aarch64.h

@@ -32,31 +32,21 @@
  *	kfpu_end()
  */
 
-#ifndef _SIMD_AARCH64_H
-#define	_SIMD_AARCH64_H
+#ifndef _LINUX_SIMD_AARCH64_H
+#define	_LINUX_SIMD_AARCH64_H
 
 #include <sys/isa_defs.h>
 
 #if defined(__aarch64__)
 
 #include <sys/types.h>
-
-#if defined(_KERNEL)
 #include <asm/neon.h>
+
 #define	kfpu_allowed()		1
 #define	kfpu_initialize(tsk)	do {} while (0)
 #define	kfpu_begin()		kernel_neon_begin()
 #define	kfpu_end()		kernel_neon_end()
-#else
-/*
- * fpu dummy methods for userspace
- */
-#define	kfpu_allowed()		1
-#define	kfpu_initialize(tsk)	do {} while (0)
-#define	kfpu_begin()		do {} while (0)
-#define	kfpu_end()		do {} while (0)
-#endif /* defined(_KERNEL) */
 
 #endif /* __aarch64__ */
 
-#endif /* _SIMD_AARCH64_H */
+#endif /* _LINUX_SIMD_AARCH64_H */

include/os/linux/kernel/linux/simd_x86.h

@@ -66,23 +66,14 @@
  *			also add zfs_avx512vl_available() to feature check.
  */
 
-#ifndef _SIMD_X86_H
-#define	_SIMD_X86_H
-
-#include <sys/isa_defs.h>
+#ifndef _LINUX_SIMD_X86_H
+#define	_LINUX_SIMD_X86_H
 
 /* only for __x86 */
 #if defined(__x86)
 
 #include <sys/types.h>
-
-#if defined(_KERNEL)
 #include <asm/cpufeature.h>
-#else
-#include <cpuid.h>
-#endif
-
-#if defined(_KERNEL)
 
 /*
  * Disable the WARN_ON_FPU() macro to prevent additional dependencies
@@ -222,185 +213,9 @@ kfpu_end(void)
 }
 #endif /* defined(HAVE_KERNEL_FPU) */
 
-#else /* defined(_KERNEL) */
 /*
- * FPU dummy methods for user space.
+ * Linux kernel provides an interface for CPU feature testing.
  */
-#define	kfpu_allowed()		1
-#define	kfpu_initialize(tsk)	do {} while (0)
-#define	kfpu_begin()		do {} while (0)
-#define	kfpu_end()		do {} while (0)
-#endif /* defined(_KERNEL) */
-
-/*
- * CPUID feature tests for user-space. Linux kernel provides an interface for
- * CPU feature testing.
- */
-#if !defined(_KERNEL)
-
-/*
- * 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
-} 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)
-
-/*
- * 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	},
-};
-
-/*
- * 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);
-
-#endif /* !defined(_KERNEL) */
-
-
 /*
  * Detect register set support
  */
@@ -410,16 +225,11 @@ __simd_state_enabled(const uint64_t state)
 	boolean_t has_osxsave;
 	uint64_t xcr0;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_OSXSAVE)
 	has_osxsave = !!boot_cpu_has(X86_FEATURE_OSXSAVE);
 #else
 	has_osxsave = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_osxsave = __cpuid_has_osxsave();
-#endif
-
 	if (!has_osxsave)
 		return (B_FALSE);
 
@@ -433,18 +243,13 @@ __simd_state_enabled(const uint64_t state)
 #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)
 {
-#if defined(_KERNEL)
 	return (!!boot_cpu_has(X86_FEATURE_XMM));
-#elif !defined(_KERNEL)
-	return (__cpuid_has_sse());
-#endif
 }
 
 /*
@@ -453,11 +258,7 @@ zfs_sse_available(void)
 static inline boolean_t
 zfs_sse2_available(void)
 {
-#if defined(_KERNEL)
 	return (!!boot_cpu_has(X86_FEATURE_XMM2));
-#elif !defined(_KERNEL)
-	return (__cpuid_has_sse2());
-#endif
 }
 
 /*
@@ -466,11 +267,7 @@ zfs_sse2_available(void)
 static inline boolean_t
 zfs_sse3_available(void)
 {
-#if defined(_KERNEL)
 	return (!!boot_cpu_has(X86_FEATURE_XMM3));
-#elif !defined(_KERNEL)
-	return (__cpuid_has_sse3());
-#endif
 }
 
 /*
@@ -479,11 +276,7 @@ zfs_sse3_available(void)
 static inline boolean_t
 zfs_ssse3_available(void)
 {
-#if defined(_KERNEL)
 	return (!!boot_cpu_has(X86_FEATURE_SSSE3));
-#elif !defined(_KERNEL)
-	return (__cpuid_has_ssse3());
-#endif
 }
 
 /*
@@ -492,11 +285,7 @@ zfs_ssse3_available(void)
 static inline boolean_t
 zfs_sse4_1_available(void)
 {
-#if defined(_KERNEL)
 	return (!!boot_cpu_has(X86_FEATURE_XMM4_1));
-#elif !defined(_KERNEL)
-	return (__cpuid_has_sse4_1());
-#endif
 }
 
 /*
@@ -505,11 +294,7 @@ zfs_sse4_1_available(void)
 static inline boolean_t
 zfs_sse4_2_available(void)
 {
-#if defined(_KERNEL)
 	return (!!boot_cpu_has(X86_FEATURE_XMM4_2));
-#elif !defined(_KERNEL)
-	return (__cpuid_has_sse4_2());
-#endif
 }
 
 /*
@@ -518,14 +303,7 @@ zfs_sse4_2_available(void)
 static inline boolean_t
 zfs_avx_available(void)
 {
-	boolean_t has_avx;
-#if defined(_KERNEL)
-	has_avx = !!boot_cpu_has(X86_FEATURE_AVX);
-#elif !defined(_KERNEL)
-	has_avx = __cpuid_has_avx();
-#endif
-
-	return (has_avx && __ymm_enabled());
+	return (boot_cpu_has(X86_FEATURE_AVX) && __ymm_enabled());
 }
 
 /*
@@ -534,14 +312,7 @@ zfs_avx_available(void)
 static inline boolean_t
 zfs_avx2_available(void)
 {
-	boolean_t has_avx2;
-#if defined(_KERNEL)
-	has_avx2 = !!boot_cpu_has(X86_FEATURE_AVX2);
-#elif !defined(_KERNEL)
-	has_avx2 = __cpuid_has_avx2();
-#endif
-
-	return (has_avx2 && __ymm_enabled());
+	return (boot_cpu_has(X86_FEATURE_AVX2) && __ymm_enabled());
 }
 
 /*
@@ -550,15 +321,11 @@ zfs_avx2_available(void)
 static inline boolean_t
 zfs_bmi1_available(void)
 {
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_BMI1)
 	return (!!boot_cpu_has(X86_FEATURE_BMI1));
 #else
 	return (B_FALSE);
 #endif
-#elif !defined(_KERNEL)
-	return (__cpuid_has_bmi1());
-#endif
 }
 
 /*
@@ -567,15 +334,11 @@ zfs_bmi1_available(void)
 static inline boolean_t
 zfs_bmi2_available(void)
 {
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_BMI2)
 	return (!!boot_cpu_has(X86_FEATURE_BMI2));
 #else
 	return (B_FALSE);
 #endif
-#elif !defined(_KERNEL)
-	return (__cpuid_has_bmi2());
-#endif
 }
 
 /*
@@ -584,15 +347,11 @@ zfs_bmi2_available(void)
 static inline boolean_t
 zfs_aes_available(void)
 {
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AES)
 	return (!!boot_cpu_has(X86_FEATURE_AES));
 #else
 	return (B_FALSE);
 #endif
-#elif !defined(_KERNEL)
-	return (__cpuid_has_aes());
-#endif
 }
 
 /*
@@ -601,15 +360,11 @@ zfs_aes_available(void)
 static inline boolean_t
 zfs_pclmulqdq_available(void)
 {
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_PCLMULQDQ)
 	return (!!boot_cpu_has(X86_FEATURE_PCLMULQDQ));
 #else
 	return (B_FALSE);
 #endif
-#elif !defined(_KERNEL)
-	return (__cpuid_has_pclmulqdq());
-#endif
 }
 
 /*
@@ -628,187 +383,141 @@ zfs_pclmulqdq_available(void)
  * AVX512VBMI	Vector Byte Manipulation Instructions
  */
 
-
-/* Check if AVX512F instruction set is available */
+/*
+ * Check if AVX512F instruction set is available
+ */
 static inline boolean_t
 zfs_avx512f_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512F)
 	has_avx512 = !!boot_cpu_has(X86_FEATURE_AVX512F);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512f();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512CD instruction set is available */
+/*
+ * Check if AVX512CD instruction set is available
+ */
 static inline boolean_t
 zfs_avx512cd_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512CD)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512CD);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512cd();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512ER instruction set is available */
+/*
+ * Check if AVX512ER instruction set is available
+ */
 static inline boolean_t
 zfs_avx512er_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512ER)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512ER);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512er();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512PF instruction set is available */
+/*
+ * Check if AVX512PF instruction set is available
+ */
 static inline boolean_t
 zfs_avx512pf_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512PF)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512PF);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512pf();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512BW instruction set is available */
+/*
+ * Check if AVX512BW instruction set is available
+ */
 static inline boolean_t
 zfs_avx512bw_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512BW)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512BW);
-#else
-	has_avx512 = B_FALSE;
-#endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512bw();
 #endif
 
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512DQ instruction set is available */
+/*
+ * Check if AVX512DQ instruction set is available
+ */
 static inline boolean_t
 zfs_avx512dq_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512DQ)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512DQ);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512dq();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512VL instruction set is available */
+/*
+ * Check if AVX512VL instruction set is available
+ */
 static inline boolean_t
 zfs_avx512vl_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512VL)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512VL);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512vl();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512IFMA instruction set is available */
+/*
+ * Check if AVX512IFMA instruction set is available
+ */
 static inline boolean_t
 zfs_avx512ifma_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512IFMA)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512IFMA);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512ifma();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
-/* Check if AVX512VBMI instruction set is available */
+/*
+ * Check if AVX512VBMI instruction set is available
+ */
 static inline boolean_t
 zfs_avx512vbmi_available(void)
 {
 	boolean_t has_avx512 = B_FALSE;
 
-#if defined(_KERNEL)
 #if defined(X86_FEATURE_AVX512VBMI)
 	has_avx512 = boot_cpu_has(X86_FEATURE_AVX512F) &&
 	    boot_cpu_has(X86_FEATURE_AVX512VBMI);
-#else
-	has_avx512 = B_FALSE;
 #endif
-#elif !defined(_KERNEL)
-	has_avx512 = __cpuid_has_avx512f() &&
-	    __cpuid_has_avx512vbmi();
-#endif
-
 	return (has_avx512 && __zmm_enabled());
 }
 
 #endif /* defined(__x86) */
 
-#endif /* _SIMD_X86_H */
+#endif /* _LINUX_SIMD_X86_H */

include/os/linux/spl/rpc/Makefile.am

@@ -1,5 +1,5 @@
 KERNEL_H = \
-	$(top_srcdir)/include/spl/rpc/xdr.h
+	$(top_srcdir)/include/os/linux/spl/rpc/xdr.h
 
 if CONFIG_KERNEL
 kerneldir = @prefix@/src/zfs-$(VERSION)/include/spl/rpc

include/os/linux/spl/sys/Makefile.am

@@ -0,0 +1,62 @@
+KERNEL_H = \
+	$(top_srcdir)/include/os/linux/spl/sys/acl.h \
+	$(top_srcdir)/include/os/linux/spl/sys/atomic.h \
+	$(top_srcdir)/include/os/linux/spl/sys/byteorder.h \
+	$(top_srcdir)/include/os/linux/spl/sys/callb.h \
+	$(top_srcdir)/include/os/linux/spl/sys/callo.h \
+	$(top_srcdir)/include/os/linux/spl/sys/cmn_err.h \
+	$(top_srcdir)/include/os/linux/spl/sys/condvar.h \
+	$(top_srcdir)/include/os/linux/spl/sys/console.h \
+	$(top_srcdir)/include/os/linux/spl/sys/cred.h \
+	$(top_srcdir)/include/os/linux/spl/sys/ctype.h \
+	$(top_srcdir)/include/os/linux/spl/sys/debug.h \
+	$(top_srcdir)/include/os/linux/spl/sys/disp.h \
+	$(top_srcdir)/include/os/linux/spl/sys/dkio.h \
+	$(top_srcdir)/include/os/linux/spl/sys/errno.h \
+	$(top_srcdir)/include/os/linux/spl/sys/fcntl.h \
+	$(top_srcdir)/include/os/linux/spl/sys/file.h \
+	$(top_srcdir)/include/os/linux/spl/sys/inttypes.h \
+	$(top_srcdir)/include/os/linux/spl/sys/isa_defs.h \
+	$(top_srcdir)/include/os/linux/spl/sys/kmem_cache.h \
+	$(top_srcdir)/include/os/linux/spl/sys/kmem.h \
+	$(top_srcdir)/include/os/linux/spl/sys/kobj.h \
+	$(top_srcdir)/include/os/linux/spl/sys/kstat.h \
+	$(top_srcdir)/include/os/linux/spl/sys/list.h \
+	$(top_srcdir)/include/os/linux/spl/sys/mode.h \
+	$(top_srcdir)/include/os/linux/spl/sys/mutex.h \
+	$(top_srcdir)/include/os/linux/spl/sys/param.h \
+	$(top_srcdir)/include/os/linux/spl/sys/processor.h \
+	$(top_srcdir)/include/os/linux/spl/sys/proc.h \
+	$(top_srcdir)/include/os/linux/spl/sys/procfs_list.h \
+	$(top_srcdir)/include/os/linux/spl/sys/random.h \
+	$(top_srcdir)/include/os/linux/spl/sys/rwlock.h \
+	$(top_srcdir)/include/os/linux/spl/sys/shrinker.h \
+	$(top_srcdir)/include/os/linux/spl/sys/sid.h \
+	$(top_srcdir)/include/os/linux/spl/sys/signal.h \
+	$(top_srcdir)/include/os/linux/spl/sys/simd.h \
+	$(top_srcdir)/include/os/linux/spl/sys/stat.h \
+	$(top_srcdir)/include/os/linux/spl/sys/strings.h \
+	$(top_srcdir)/include/os/linux/spl/sys/sunddi.h \
+	$(top_srcdir)/include/os/linux/spl/sys/sysmacros.h \
+	$(top_srcdir)/include/os/linux/spl/sys/systeminfo.h \
+	$(top_srcdir)/include/os/linux/spl/sys/taskq.h \
+	$(top_srcdir)/include/os/linux/spl/sys/thread.h \
+	$(top_srcdir)/include/os/linux/spl/sys/time.h \
+	$(top_srcdir)/include/os/linux/spl/sys/timer.h \
+	$(top_srcdir)/include/os/linux/spl/sys/tsd.h \
+	$(top_srcdir)/include/os/linux/spl/sys/types32.h \
+	$(top_srcdir)/include/os/linux/spl/sys/types.h \
+	$(top_srcdir)/include/os/linux/spl/sys/uio.h \
+	$(top_srcdir)/include/os/linux/spl/sys/user.h \
+	$(top_srcdir)/include/os/linux/spl/sys/vfs.h \
+	$(top_srcdir)/include/os/linux/spl/sys/vmem.h \
+	$(top_srcdir)/include/os/linux/spl/sys/vmsystm.h \
+	$(top_srcdir)/include/os/linux/spl/sys/vnode.h \
+	$(top_srcdir)/include/os/linux/spl/sys/wait.h \
+	$(top_srcdir)/include/os/linux/spl/sys/zmod.h \
+	$(top_srcdir)/include/os/linux/spl/sys/zone.h
+
+if CONFIG_KERNEL
+kerneldir = @prefix@/src/zfs-$(VERSION)/include/spl/sys
+kernel_HEADERS = $(KERNEL_H)
+endif

include/os/linux/spl/sys/simd.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_SYS_SIMD_H
+#define	_SPL_SYS_SIMD_H
+
+#include <sys/isa_defs.h>
+#include <linux/simd.h>
+
+#endif /* _SPL_SYS_SIMD_H */

include/os/linux/zfs/Makefile.am

@@ -0,0 +1 @@
+SUBDIRS = sys

include/os/linux/zfs/sys/Makefile.am

@@ -0,0 +1,12 @@
+KERNEL_H = \
+	$(top_srcdir)/include/os/linux/zfs/sys/policy.h \
+	$(top_srcdir)/include/os/linux/zfs/sys/zfs_ctldir.h \
+	$(top_srcdir)/include/os/linux/zfs/sys/zfs_dir.h \
+	$(top_srcdir)/include/os/linux/zfs/sys/zfs_vfsops.h \
+	$(top_srcdir)/include/os/linux/zfs/sys/zfs_vnops.h \
+	$(top_srcdir)/include/os/linux/zfs/sys/zpl.h
+
+if CONFIG_KERNEL
+kerneldir = @prefix@/src/zfs-$(VERSION)/include/sys
+kernel_HEADERS = $(KERNEL_H)
+endif

include/spl/sys/Makefile.am

@@ -1,61 +0,0 @@
-KERNEL_H = \
-	$(top_srcdir)/include/spl/sys/acl.h \
-	$(top_srcdir)/include/spl/sys/atomic.h \
-	$(top_srcdir)/include/spl/sys/byteorder.h \
-	$(top_srcdir)/include/spl/sys/callb.h \
-	$(top_srcdir)/include/spl/sys/callo.h \
-	$(top_srcdir)/include/spl/sys/cmn_err.h \
-	$(top_srcdir)/include/spl/sys/condvar.h \
-	$(top_srcdir)/include/spl/sys/console.h \
-	$(top_srcdir)/include/spl/sys/cred.h \
-	$(top_srcdir)/include/spl/sys/ctype.h \
-	$(top_srcdir)/include/spl/sys/debug.h \
-	$(top_srcdir)/include/spl/sys/disp.h \
-	$(top_srcdir)/include/spl/sys/dkio.h \
-	$(top_srcdir)/include/spl/sys/errno.h \
-	$(top_srcdir)/include/spl/sys/fcntl.h \
-	$(top_srcdir)/include/spl/sys/file.h \
-	$(top_srcdir)/include/spl/sys/inttypes.h \
-	$(top_srcdir)/include/spl/sys/isa_defs.h \
-	$(top_srcdir)/include/spl/sys/kmem_cache.h \
-	$(top_srcdir)/include/spl/sys/kmem.h \
-	$(top_srcdir)/include/spl/sys/kobj.h \
-	$(top_srcdir)/include/spl/sys/kstat.h \
-	$(top_srcdir)/include/spl/sys/list.h \
-	$(top_srcdir)/include/spl/sys/mode.h \
-	$(top_srcdir)/include/spl/sys/mutex.h \
-	$(top_srcdir)/include/spl/sys/param.h \
-	$(top_srcdir)/include/spl/sys/processor.h \
-	$(top_srcdir)/include/spl/sys/proc.h \
-	$(top_srcdir)/include/spl/sys/procfs_list.h \
-	$(top_srcdir)/include/spl/sys/random.h \
-	$(top_srcdir)/include/spl/sys/rwlock.h \
-	$(top_srcdir)/include/spl/sys/shrinker.h \
-	$(top_srcdir)/include/spl/sys/sid.h \
-	$(top_srcdir)/include/spl/sys/signal.h \
-	$(top_srcdir)/include/spl/sys/stat.h \
-	$(top_srcdir)/include/spl/sys/strings.h \
-	$(top_srcdir)/include/spl/sys/sunddi.h \
-	$(top_srcdir)/include/spl/sys/sysmacros.h \
-	$(top_srcdir)/include/spl/sys/systeminfo.h \
-	$(top_srcdir)/include/spl/sys/taskq.h \
-	$(top_srcdir)/include/spl/sys/thread.h \
-	$(top_srcdir)/include/spl/sys/time.h \
-	$(top_srcdir)/include/spl/sys/timer.h \
-	$(top_srcdir)/include/spl/sys/tsd.h \
-	$(top_srcdir)/include/spl/sys/types32.h \
-	$(top_srcdir)/include/spl/sys/types.h \
-	$(top_srcdir)/include/spl/sys/uio.h \
-	$(top_srcdir)/include/spl/sys/user.h \
-	$(top_srcdir)/include/spl/sys/vfs.h \
-	$(top_srcdir)/include/spl/sys/vmem.h \
-	$(top_srcdir)/include/spl/sys/vmsystm.h \
-	$(top_srcdir)/include/spl/sys/vnode.h \
-	$(top_srcdir)/include/spl/sys/wait.h \
-	$(top_srcdir)/include/spl/sys/zmod.h \
-	$(top_srcdir)/include/spl/sys/zone.h
-
-if CONFIG_KERNEL
-kerneldir = @prefix@/src/zfs-$(VERSION)/include/spl/sys
-kernel_HEADERS = $(KERNEL_H)
-endif

include/sys/Makefile.am

@@ -52,7 +52,6 @@ COMMON_H = \
 	$(top_srcdir)/include/sys/nvpair_impl.h \
 	$(top_srcdir)/include/sys/objlist.h \
 	$(top_srcdir)/include/sys/pathname.h \
-	$(top_srcdir)/include/sys/policy.h \
 	$(top_srcdir)/include/sys/range_tree.h \
 	$(top_srcdir)/include/sys/refcount.h \
 	$(top_srcdir)/include/sys/rrwlock.h \
@@ -116,10 +115,8 @@ COMMON_H = \
 	$(top_srcdir)/include/sys/zfeature.h \
 	$(top_srcdir)/include/sys/zfs_acl.h \
 	$(top_srcdir)/include/sys/zfs_context.h \
-	$(top_srcdir)/include/sys/zfs_ctldir.h \
 	$(top_srcdir)/include/sys/zfs_debug.h \
 	$(top_srcdir)/include/sys/zfs_delay.h \
-	$(top_srcdir)/include/sys/zfs_dir.h \
 	$(top_srcdir)/include/sys/zfs_fuid.h \
 	$(top_srcdir)/include/sys/zfs_project.h \
 	$(top_srcdir)/include/sys/zfs_ratelimit.h \
@@ -127,8 +124,6 @@ COMMON_H = \
 	$(top_srcdir)/include/sys/zfs_sa.h \
 	$(top_srcdir)/include/sys/zfs_stat.h \
 	$(top_srcdir)/include/sys/zfs_sysfs.h \
-	$(top_srcdir)/include/sys/zfs_vfsops.h \
-	$(top_srcdir)/include/sys/zfs_vnops.h \
 	$(top_srcdir)/include/sys/zfs_znode.h \
 	$(top_srcdir)/include/sys/zil.h \
 	$(top_srcdir)/include/sys/zil_impl.h \
@@ -144,7 +139,6 @@ COMMON_H = \
 KERNEL_H = \
 	$(top_srcdir)/include/sys/zfs_ioctl.h \
 	$(top_srcdir)/include/sys/zfs_onexit.h \
-	${top_srcdir}/include/sys/zpl.h \
 	$(top_srcdir)/include/sys/zvol.h
 
 USER_H =

lib/libspl/include/sys/Makefile.am

@@ -33,6 +33,7 @@ libspl_HEADERS = \
 	$(top_srcdir)/lib/libspl/include/sys/priv.h \
 	$(top_srcdir)/lib/libspl/include/sys/processor.h \
 	$(top_srcdir)/lib/libspl/include/sys/signal.h \
+	$(top_srcdir)/lib/libspl/include/sys/simd.h \
 	$(top_srcdir)/lib/libspl/include/sys/stack.h \
 	$(top_srcdir)/lib/libspl/include/sys/stat.h \
 	$(top_srcdir)/lib/libspl/include/sys/stdtypes.h \

lib/libspl/include/sys/simd.h

@@ -0,0 +1,448 @@
+/*
+ * 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 http://www.opensolaris.org/os/licensing.
+ * 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 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _LIBSPL_SYS_SIMD_H
+#define	_LIBSPL_SYS_SIMD_H
+
+#include <sys/isa_defs.h>
+#include <sys/types.h>
+
+#if defined(__x86)
+#include <cpuid.h>
+
+#define	kfpu_allowed()		1
+#define	kfpu_initialize(tsk)	do {} while (0)
+#define	kfpu_begin()		do {} while (0)
+#define	kfpu_end()		do {} while (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
+} 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)
+
+/*
+ * 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	},
+};
+
+/*
+ * 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);
+
+/*
+ * 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());
+}
+
+/*
+ * 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)
+
+#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 */

module/Makefile.in

@@ -12,7 +12,9 @@ INSTALL_MOD_DIR ?= extra
 ZFS_MODULE_CFLAGS += -std=gnu99 -Wno-declaration-after-statement
 ZFS_MODULE_CFLAGS += @KERNEL_DEBUG_CFLAGS@
 ZFS_MODULE_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-ZFS_MODULE_CFLAGS += -I@abs_top_srcdir@/include/spl
+ZFS_MODULE_CFLAGS += -I@abs_top_srcdir@/include/os/linux/kernel
+ZFS_MODULE_CFLAGS += -I@abs_top_srcdir@/include/os/linux/spl
+ZFS_MODULE_CFLAGS += -I@abs_top_srcdir@/include/os/linux/zfs
 ZFS_MODULE_CFLAGS += -I@abs_top_srcdir@/include
 
 ZFS_MODULE_CPPFLAGS += -D_KERNEL

module/icp/algs/aes/aes_impl.c

@@ -25,9 +25,9 @@
 #include <sys/zfs_context.h>
 #include <sys/crypto/icp.h>
 #include <sys/crypto/spi.h>
+#include <sys/simd.h>
 #include <modes/modes.h>
 #include <aes/aes_impl.h>
-#include <linux/simd.h>
 
 /*
  * Initialize AES encryption and decryption key schedules.

module/icp/algs/aes/aes_impl_aesni.c

@@ -24,7 +24,8 @@
 
 #if defined(__x86_64) && defined(HAVE_AES)
 
-#include <linux/simd_x86.h>
+#include <sys/simd.h>
+#include <sys/types.h>
 
 /* These functions are used to execute AES-NI instructions: */
 extern int rijndael_key_setup_enc_intel(uint32_t rk[],

module/icp/algs/aes/aes_impl_x86-64.c

@@ -24,7 +24,7 @@
 
 #if defined(__x86_64)
 
-#include <linux/simd_x86.h>
+#include <sys/simd.h>
 
 /* These functions are used to execute amd64 instructions for AMD or Intel: */
 extern int rijndael_key_setup_enc_amd64(uint32_t rk[],

module/icp/algs/modes/gcm.c

@@ -28,8 +28,8 @@
 #include <sys/crypto/icp.h>
 #include <sys/crypto/impl.h>
 #include <sys/byteorder.h>
+#include <sys/simd.h>
 #include <modes/gcm_impl.h>
-#include <linux/simd.h>
 
 #define	GHASH(c, d, t, o) \
 	xor_block((uint8_t *)(d), (uint8_t *)(c)->gcm_ghash); \