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Add PPC cpu feature tests for FreeBSD and Linux

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Add needed cpu feature tests for powerpc architecture.

Overview:
zfs_altivec_available() - needed by RAID-Z
zfs_vsx_available()     - needed by BLAKE3
zfs_isa207_available()  - needed by SHA2

Part 1 - Userspace
- use getauxval() for Linux and elf_aux_info() for FreeBSD
- direct including <sys/auxv.h> fails with double definitions
- so we self define the needed functions and definitions

Part 2 - Kernel space FreeBSD
- use exported cpu_features of <powerpc/cpu.h>

Part 3 - Kernel space Linux
- use cpu_has_feature() function of <asm/cpufeature.h>

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Closes #13725
This commit is contained in:
Tino Reichardt
2022-09-07 20:33:59 +02:00
committed by Brian Behlendorf
parent eeca9d27d7
commit 48cf170d5a
6 changed files with 204 additions and 117 deletions
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lib/libspl/include/sys/simd.h
+43 -46
View File
@@ -20,8 +20,8 @@
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright (c) 2006 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
*/
#ifndef _LIBSPL_SYS_SIMD_H
@@ -452,63 +452,60 @@ zfs_avx512vbmi_available(void)
#elif defined(__powerpc__)
/* including <sys/auxv.h> 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)
/*
* Check if AltiVec instruction set is available
* No easy way beyond 'altivec works' :-(
*/
#include <signal.h>
#include <setjmp.h>
#if defined(__ALTIVEC__) && !defined(__FreeBSD__)
static jmp_buf env;
static void sigillhandler(int x)
{
(void) x;
longjmp(env, 1);
}
#endif
#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
static inline boolean_t
zfs_altivec_available(void)
{
boolean_t has_altivec = B_FALSE;
#if defined(__ALTIVEC__) && !defined(__FreeBSD__)
sighandler_t savesig;
savesig = signal(SIGILL, sigillhandler);
if (setjmp(env)) {
signal(SIGILL, savesig);
has_altivec = B_FALSE;
} else {
__asm__ __volatile__("vor 0,0,0\n" : : : "v0");
signal(SIGILL, savesig);
has_altivec = B_TRUE;
}
#endif
return (has_altivec);
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)
{
boolean_t has_vsx = B_FALSE;
#if defined(__ALTIVEC__) && !defined(__FreeBSD__)
sighandler_t savesig;
savesig = signal(SIGILL, sigillhandler);
if (setjmp(env)) {
signal(SIGILL, savesig);
has_vsx = B_FALSE;
} else {
__asm__ __volatile__("xssubsp 0,0,0\n");
signal(SIGILL, savesig);
has_vsx = B_TRUE;
}
#endif
return (has_vsx);
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