From fc0c72b1670156622af26562030e84bd56d4cdfb Mon Sep 17 00:00:00 2001 From: Gvozden Neskovic Date: Mon, 29 Feb 2016 19:42:27 +0100 Subject: Support for vectorized algorithms on x86 This is initial support for x86 vectorized implementations of ZFS parity and checksum algorithms. For the compilation phase, configure step checks if toolchain supports relevant instruction sets. Each implementation must ensure that the code is not passed to compiler if relevant instruction set is not supported. For this purpose, following new defines are provided if instruction set is supported: - HAVE_SSE, - HAVE_SSE2, - HAVE_SSE3, - HAVE_SSSE3, - HAVE_SSE4_1, - HAVE_SSE4_2, - HAVE_AVX, - HAVE_AVX2. For detecting if an instruction set can be used in runtime, following functions are provided in (include/linux/simd_x86.h): - zfs_sse_available() - zfs_sse2_available() - zfs_sse3_available() - zfs_ssse3_available() - zfs_sse4_1_available() - zfs_sse4_2_available() - zfs_avx_available() - zfs_avx2_available() - zfs_bmi1_available() - zfs_bmi2_available() These function should be called once, on module load, or initialization. They are safe to use from user and kernel space. If an implementation is using more than single instruction set, both compiler and runtime support for all relevant instruction sets should be checked. Kernel fpu methods: - kfpu_begin() - kfpu_end() Use __get_cpuid_max and __cpuid_count from Both gcc and clang have support for these. They also handle ebx register in case it is used for PIC code. Signed-off-by: Gvozden Neskovic Signed-off-by: Brian Behlendorf Signed-off-by: Chunwei Chen Closes #4381 --- config/kernel-fpu.m4 | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 config/kernel-fpu.m4 (limited to 'config/kernel-fpu.m4') diff --git a/config/kernel-fpu.m4 b/config/kernel-fpu.m4 new file mode 100644 index 000000000..1c5690969 --- /dev/null +++ b/config/kernel-fpu.m4 @@ -0,0 +1,18 @@ +dnl # +dnl # 4.2 API change +dnl # asm/i387.h is replaced by asm/fpu/api.h +dnl # +AC_DEFUN([ZFS_AC_KERNEL_FPU], [ + AC_MSG_CHECKING([whether asm/fpu/api.h exists]) + ZFS_LINUX_TRY_COMPILE([ + #include + #include + ],[ + __kernel_fpu_begin(); + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_FPU_API_H, 1, [kernel has interface]) + ],[ + AC_MSG_RESULT(no) + ]) +]) -- cgit v1.2.3