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riscv: Add Linux hwprobe syscall support

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Add awareness and a thin wrapper function around a new Linux system call
that allows callers to get architecture and microarchitecture
information about the CPUs from the kernel. This can be used to
do things like dynamically choose a memcpy implementation.

Signed-off-by: Evan Green <evan@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Evan Green 2024-02-27 14:56:37 -08:00 committed by Palmer Dabbelt
parent 71648e8004
commit 426d0e1aa8
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
6 changed files with 125 additions and 2 deletions
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12
sysdeps/unix/sysv/linux/riscv/Makefile
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@ -1,6 +1,14 @@
ifeq ($(subdir),misc)
sysdep_headers += sys/cachectl.h
sysdep_routines += flush-icache
sysdep_headers += \
sys/cachectl.h \
sys/hwprobe.h \
# sysdep_headers
sysdep_routines += \
flush-icache \
hwprobe \
# sysdep_routines
endif
ifeq ($(subdir),stdlib)

3
sysdeps/unix/sysv/linux/riscv/Versions
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@ -8,4 +8,7 @@ libc {
GLIBC_2.27 {
__riscv_flush_icache;
}
GLIBC_2.40 {
__riscv_hwprobe;
}
}

36
sysdeps/unix/sysv/linux/riscv/hwprobe.c Normal file
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@ -0,0 +1,36 @@
/* RISC-V hardware feature probing support on Linux
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/syscall.h>
#include <sys/hwprobe.h>
#include <sysdep.h>
#include <sysdep-vdso.h>
int __riscv_hwprobe (struct riscv_hwprobe *pairs, size_t pair_count,
size_t cpu_count, unsigned long int *cpus,
unsigned int flags)
{
int r;
r = INTERNAL_SYSCALL_CALL (riscv_hwprobe, pairs, pair_count,
cpu_count, cpus, flags);
/* Negate negative errno values to match pthreads API. */
return -r;
}

1
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2511,3 +2511,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
GLIBC_2.39 stdc_trailing_zeros_ul F
GLIBC_2.39 stdc_trailing_zeros_ull F
GLIBC_2.39 stdc_trailing_zeros_us F
GLIBC_2.40 __riscv_hwprobe F

1
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2711,3 +2711,4 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
GLIBC_2.39 stdc_trailing_zeros_ul F
GLIBC_2.39 stdc_trailing_zeros_ull F
GLIBC_2.39 stdc_trailing_zeros_us F
GLIBC_2.40 __riscv_hwprobe F

74
sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h Normal file
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@ -0,0 +1,74 @@
/* RISC-V architecture probe interface
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_HWPROBE_H
#define _SYS_HWPROBE_H 1
#include <features.h>
#include <stddef.h>
#ifdef __has_include
# if __has_include (<asm/hwprobe.h>)
# include <asm/hwprobe.h>
# endif
#endif
/* Define a (probably stale) version of the interface if the Linux headers
aren't present. */
#ifndef RISCV_HWPROBE_KEY_MVENDORID
struct riscv_hwprobe {
signed long long int key;
unsigned long long int value;
};
#define RISCV_HWPROBE_KEY_MVENDORID 0
#define RISCV_HWPROBE_KEY_MARCHID 1
#define RISCV_HWPROBE_KEY_MIMPID 2
#define RISCV_HWPROBE_KEY_BASE_BEHAVIOR 3
#define RISCV_HWPROBE_BASE_BEHAVIOR_IMA (1 << 0)
#define RISCV_HWPROBE_KEY_IMA_EXT_0 4
#define RISCV_HWPROBE_IMA_FD (1 << 0)
#define RISCV_HWPROBE_IMA_C (1 << 1)
#define RISCV_HWPROBE_IMA_V (1 << 2)
#define RISCV_HWPROBE_EXT_ZBA (1 << 3)
#define RISCV_HWPROBE_EXT_ZBB (1 << 4)
#define RISCV_HWPROBE_EXT_ZBS (1 << 5)
#define RISCV_HWPROBE_EXT_ZICBOZ (1 << 6)
#define RISCV_HWPROBE_KEY_CPUPERF_0 5
#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)
#define RISCV_HWPROBE_MISALIGNED_SLOW (2 << 0)
#define RISCV_HWPROBE_MISALIGNED_FAST (3 << 0)
#define RISCV_HWPROBE_MISALIGNED_UNSUPPORTED (4 << 0)
#define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0)
#define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6
#endif /* RISCV_HWPROBE_KEY_MVENDORID */
__BEGIN_DECLS
extern int __riscv_hwprobe (struct riscv_hwprobe *__pairs, size_t __pair_count,
size_t __cpu_count, unsigned long int *__cpus,
unsigned int __flags)
__nonnull ((1)) __wur
__fortified_attr_access (__read_write__, 1, 2)
__fortified_attr_access (__read_only__, 4, 3);
__END_DECLS
#endif /* sys/hwprobe.h */