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[2.1] compat: add check for kernel_neon_* availability #15761

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Jan 12, 2024
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[2.1] compat: add check for kernel_neon_* availability #15761

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39 changes: 28 additions & 11 deletions config/kernel-fpu.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,13 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
__kernel_fpu_end();
], [], [ZFS_META_LICENSE])

ZFS_LINUX_TEST_SRC([kernel_neon], [
#include <asm/neon.h>
], [
kernel_neon_begin();
kernel_neon_end();
], [], [ZFS_META_LICENSE])

ZFS_LINUX_TEST_SRC([fpu_internal], [
#if defined(__x86_64) || defined(__x86_64__) || \
defined(__i386) || defined(__i386__)
Expand Down Expand Up @@ -186,18 +193,28 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
[kernel exports FPU functions])
],[
ZFS_LINUX_TEST_RESULT([fpu_internal], [
AC_MSG_RESULT(internal)
AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
[kernel fpu internal])
dnl #
dnl # ARM neon symbols (only on arm and arm64)
dnl # could be GPL-only on arm64 after Linux 6.2
dnl #
ZFS_LINUX_TEST_RESULT([kernel_neon_license],[
AC_MSG_RESULT(kernel_neon_*)
AC_DEFINE(HAVE_KERNEL_NEON, 1,
[kernel has kernel_neon_* functions])
],[
ZFS_LINUX_TEST_RESULT([fpu_xsave_internal], [
AC_MSG_RESULT(internal with internal XSAVE)
AC_DEFINE(HAVE_KERNEL_FPU_XSAVE_INTERNAL, 1,
[kernel fpu and XSAVE internal])
],[
AC_MSG_RESULT(unavailable)
])
ZFS_LINUX_TEST_RESULT([fpu_internal], [
AC_MSG_RESULT(internal)
AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
[kernel fpu internal])
],[
ZFS_LINUX_TEST_RESULT([fpu_xsave_internal], [
AC_MSG_RESULT(internal with internal XSAVE)
AC_DEFINE(HAVE_KERNEL_FPU_XSAVE_INTERNAL, 1,
[kernel fpu and XSAVE internal])
],[
AC_MSG_RESULT(unavailable)
])
])
])
])
])
Expand Down
6 changes: 6 additions & 0 deletions include/os/linux/kernel/linux/simd_aarch64.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,9 +43,15 @@
#include <sys/types.h>
#include <asm/neon.h>

#if (defined(HAVE_KERNEL_NEON) && defined(CONFIG_KERNEL_MODE_NEON))
#define kfpu_allowed() 1
#define kfpu_begin() kernel_neon_begin()
#define kfpu_end() kernel_neon_end()
#else
#define kfpu_allowed() 0
#define kfpu_begin() do {} while (0)
#define kfpu_end() do {} while (0)
#endif
#define kfpu_init() 0
#define kfpu_fini() ((void) 0)

Expand Down
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