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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
Download Patch File Download Diff File Expand all files Collapse all files
include/os/linux/kernel/linux/simd_powerpc.h
+39 -44
View File
@@ -21,6 +21,7 @@
/*
* Copyright (C) 2019 Romain Dolbeau
* <romain.dolbeau@european-processor-initiative.eu>
* Copyright (C) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
*/
/*
@@ -41,7 +42,9 @@
* all relevant feature test functions should be called.
*
* Supported features:
* zfs_altivec_available()
* zfs_altivec_available()
* zfs_vsx_available()
* zfs_isa207_available()
*/
#ifndef _LINUX_SIMD_POWERPC_H
@@ -57,73 +60,65 @@
#include <sys/types.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0)
#include <asm/cpufeature.h>
#else
#include <asm/cputable.h>
#endif
#define kfpu_allowed() 1
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
#define kfpu_end() \
{ \
disable_kernel_vsx(); \
disable_kernel_altivec(); \
preempt_enable(); \
}
#define kfpu_begin() \
{ \
preempt_disable(); \
enable_kernel_altivec(); \
enable_kernel_vsx(); \
enable_kernel_spe(); \
}
#define kfpu_end() \
{ \
disable_kernel_spe(); \
disable_kernel_vsx(); \
disable_kernel_altivec(); \
preempt_enable(); \
}
#else
/* seems that before 4.5 no-one bothered */
#define kfpu_begin()
#define kfpu_end() preempt_enable()
#endif
#define kfpu_init() 0
#define kfpu_fini() ((void) 0)
static inline boolean_t
zfs_vsx_available(void)
{
boolean_t res;
#if defined(__powerpc64__)
u64 msr;
#else
u32 msr;
#endif
kfpu_begin();
__asm volatile("mfmsr %0" : "=r"(msr));
res = (msr & 0x800000) != 0;
kfpu_end();
return (res);
}
/*
* Check if AltiVec instruction set is available
*/
static inline boolean_t
zfs_altivec_available(void)
{
boolean_t res;
/* suggested by macallan at netbsd dot org */
#if defined(__powerpc64__)
u64 msr;
#else
u32 msr;
#endif
kfpu_begin();
__asm volatile("mfmsr %0" : "=r"(msr));
/*
* 64 bits -> need to check bit 38
* Power ISA Version 3.0B
* p944
* 32 bits -> Need to check bit 6
* AltiVec Technology Programming Environments Manual
* p49 (2-9)
* They are the same, as ppc counts 'backward' ...
*/
res = (msr & 0x2000000) != 0;
kfpu_end();
return (res);
return (cpu_has_feature(CPU_FTR_ALTIVEC));
}
/*
* Check if VSX is available
*/
static inline boolean_t
zfs_vsx_available(void)
{
return (cpu_has_feature(CPU_FTR_VSX));
}
/*
* Check if POWER ISA 2.07 is available (SHA2)
*/
static inline boolean_t
zfs_isa207_available(void)
{
return (cpu_has_feature(CPU_FTR_ARCH_207S));
}
#endif /* defined(__powerpc) */
#endif /* _LINUX_SIMD_POWERPC_H */