mirror of
https://sourceware.org/git/glibc.git
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LoongArch: Add glibc.cpu.hwcap support.
The current IFUNC selection is always using the most recent features which are available via AT_HWCAP. But in some scenarios it is useful to adjust this selection. The environment variable: GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,zzz,.... can be used to enable HWCAP feature yyy, disable HWCAP feature xxx, where the feature name is case-sensitive and has to match the ones used in sysdeps/loongarch/cpu-tunables.c. Signed-off-by: caiyinyu <caiyinyu@loongson.cn>
This commit is contained in:
parent
f4724843ad
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095067efdf
@ -525,7 +525,10 @@ a CPU arch-level like @code{z13} instead of single HWCAP and STFLE features.
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On powerpc, the supported HWCAP and HWCAP2 features can be found in
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@code{sysdeps/powerpc/dl-procinfo.c}.
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This tunable is specific to i386, x86-64, s390x and powerpc.
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On loongarch, the supported HWCAP features can be found in
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@code{sysdeps/loongarch/cpu-tunables.c}.
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This tunable is specific to i386, x86-64, s390x, powerpc and loongarch.
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@end deftp
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@deftp Tunable glibc.cpu.cached_memopt
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@ -1,11 +1,23 @@
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ifeq ($(subdir),misc)
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sysdep_headers += sys/asm.h
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tests += \
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tst-hwcap-tunables \
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# tests
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tst-hwcap-tunables-ARGS = -- $(host-test-program-cmd)
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endif
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ifeq ($(subdir),elf)
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gen-as-const-headers += dl-link.sym
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endif
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ifeq ($(subdir),elf)
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sysdep-dl-routines += \
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dl-get-cpu-features \
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# sysdep-dl-routines
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endif
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# LoongArch's assembler also needs to know about PIC as it changes the
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# definition of some assembler macros.
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ASFLAGS-.os += $(pic-ccflag)
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87
sysdeps/loongarch/cpu-tunables.c
Normal file
87
sysdeps/loongarch/cpu-tunables.c
Normal file
@ -0,0 +1,87 @@
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/* LoongArch CPU feature tuning.
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This file is part of the GNU C Library.
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Copyright (C) 2024 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdbool.h>
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#include <stdint.h>
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#include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */
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#include <elf/dl-tunables.h>
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#include <string.h>
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#include <cpu-features.h>
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#include <ldsodefs.h>
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#include <sys/auxv.h>
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#include <dl-tunables-parse.h>
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#include <dl-symbol-redir-ifunc.h>
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#define CHECK_GLIBC_IFUNC_CPU(f, name, len) \
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_Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \
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if (tunable_str_comma_strcmp_cte (&f, #name)) \
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{ \
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if (f.disable) \
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GLRO(dl_larch_cpu_features).hwcap &= (~HWCAP_LOONGARCH_##name); \
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else \
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GLRO(dl_larch_cpu_features).hwcap |= HWCAP_LOONGARCH_##name; \
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break; \
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}
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attribute_hidden void
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TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp)
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{
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/* The current IFUNC selection is based on microbenchmarks in glibc.
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It should give the best performance for most workloads. But other
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choices may have better performance for a particular workload or on
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the hardware which wasn't available when the selection was made.
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The environment variable:
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GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,-zzz,....
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can be used to enable CPU/ARCH feature yyy, disable CPU/ARCH feature
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yyy and zzz, where the feature name is case-sensitive and has to
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match the ones in cpu-features.h. It can be used by glibc developers
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to tune for a new processor or override the IFUNC selection to
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improve performance for a particular workload.
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NOTE: the IFUNC selection may change over time. Please check all
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multiarch implementations when experimenting. */
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struct tunable_str_comma_state_t ts;
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tunable_str_comma_init (&ts, valp);
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struct tunable_str_comma_t n;
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while (tunable_str_comma_next (&ts, &n))
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{
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switch (n.len)
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{
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default:
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break;
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case 3:
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{
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CHECK_GLIBC_IFUNC_CPU (n, LSX, 3);
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CHECK_GLIBC_IFUNC_CPU (n, UAL, 3);
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}
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break;
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case 4:
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{
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CHECK_GLIBC_IFUNC_CPU (n, LASX, 4);
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}
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break;
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}
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}
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/* Ensure that the user has not enabled any unsupported features. */
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GLRO(dl_larch_cpu_features).hwcap &= GLRO(dl_hwcap);
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}
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25
sysdeps/loongarch/dl-get-cpu-features.c
Normal file
25
sysdeps/loongarch/dl-get-cpu-features.c
Normal file
@ -0,0 +1,25 @@
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/* Define _dl_larch_get_cpu_features.
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Copyright (C) 2024 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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const struct cpu_features *
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_dl_larch_get_cpu_features (void)
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{
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return &GLRO(dl_larch_cpu_features);
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}
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@ -29,6 +29,8 @@
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#include <dl-static-tls.h>
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#include <dl-machine-rel.h>
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#include <cpu-features.c>
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#ifndef _RTLD_PROLOGUE
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# define _RTLD_PROLOGUE(entry) \
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".globl\t" __STRING (entry) "\n\t" \
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@ -53,6 +55,23 @@
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#define ELF_MACHINE_NO_REL 1
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#define ELF_MACHINE_NO_RELA 0
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#define DL_PLATFORM_INIT dl_platform_init ()
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static inline void __attribute__ ((unused))
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dl_platform_init (void)
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{
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if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
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/* Avoid an empty string which would disturb us. */
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GLRO(dl_platform) = NULL;
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#ifdef SHARED
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/* init_cpu_features has been called early from __libc_start_main in
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static executable. */
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init_cpu_features (&GLRO(dl_larch_cpu_features));
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#endif
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}
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int
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elf_machine_matches_host (const ElfW (Ehdr) *ehdr)
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@ -290,10 +309,10 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
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#ifdef SHARED
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if (profile != 0)
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{
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# if !defined __loongarch_soft_float
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if (SUPPORT_LASX)
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#if !defined __loongarch_soft_float
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if (RTLD_SUPPORT_LASX)
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile_lasx;
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else if (SUPPORT_LSX)
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else if (RTLD_SUPPORT_LSX)
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile_lsx;
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else
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# endif
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@ -312,9 +331,9 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
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indicated by the offset on the stack, and then jump to
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the resolved address. */
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#if !defined __loongarch_soft_float
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if (SUPPORT_LASX)
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if (RTLD_SUPPORT_LASX)
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_resolve_lasx;
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else if (SUPPORT_LSX)
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else if (RTLD_SUPPORT_LSX)
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gotplt[0] = (ElfW(Addr)) &_dl_runtime_resolve_lsx;
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else
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#endif
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25
sysdeps/loongarch/dl-tunables.list
Normal file
25
sysdeps/loongarch/dl-tunables.list
Normal file
@ -0,0 +1,25 @@
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# LoongArch specific tunables.
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# Copyright (C) 2024 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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glibc {
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cpu {
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hwcaps {
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type: STRING
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}
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}
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}
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@ -19,6 +19,9 @@
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#ifndef _DL_IFUNC_GENERIC_H
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#define _DL_IFUNC_GENERIC_H
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#ifndef SHARED
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asm ("memset = __memset_aligned");
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asm ("memcmp = __memcmp_aligned");
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#endif
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#endif
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136
sysdeps/loongarch/tst-hwcap-tunables.c
Normal file
136
sysdeps/loongarch/tst-hwcap-tunables.c
Normal file
@ -0,0 +1,136 @@
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/* Tests for LoongArch GLIBC_TUNABLES=glibc.cpu.hwcaps filter.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <array_length.h>
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#include <getopt.h>
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#include <ifunc-impl-list.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xunistd.h>
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#include <sys/auxv.h>
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#include <sys/wait.h>
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/* Nonzero if the program gets called via `exec'. */
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#define CMDLINE_OPTIONS \
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{ "restart", no_argument, &restart, 1 }, \
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{ "enable", no_argument, &enable, 1 },
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static int restart;
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static int enable;
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/* Hold the four initial argument used to respawn the process, plus the extra
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'--direct', '--restart', and the function to check. */
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static char *spargs[9];
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static int fc;
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/* Called on process re-execution. */
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_Noreturn static void
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handle_restart (int argc, char *argv[])
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{
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TEST_VERIFY_EXIT (argc == 1);
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const char *funcname = argv[0];
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struct libc_ifunc_impl impls[32];
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int cnt = __libc_ifunc_impl_list ("memcpy", impls, array_length (impls));
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if (cnt == 0)
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_exit (EXIT_SUCCESS);
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TEST_VERIFY_EXIT (cnt >= 1);
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for (int i = 0; i < cnt; i++)
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{
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if (strcmp (impls[i].name, funcname) == 0)
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{
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if (enable && impls[i].usable != true)
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FAIL_EXIT1 ("FAIL: %s ifunc selection is not enabled.\n", funcname);
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else if (!enable && impls[i].usable != false)
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FAIL_EXIT1 ("FAIL: %s ifunc selection is not disabled.\n", funcname);
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break;
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}
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}
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_exit (EXIT_SUCCESS);
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}
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static void
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run_test (const char *filter, const char *funcname, int disable)
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{
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if (disable)
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printf ("info: checking filter %s (expect %s ifunc "
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"selection to be disabled)\n", filter, funcname);
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else
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{
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printf ("info: checking filter %s (expect %s ifunc "
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"selection to be enabled)\n", filter, funcname);
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spargs[fc++] = (char *) "--enable";
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}
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char *tunable = xasprintf ("GLIBC_TUNABLES=glibc.cpu.hwcaps=%s", filter);
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char *const newenvs[] = { (char*) tunable, NULL };
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spargs[fc] = (char *) funcname;
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pid_t pid;
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TEST_COMPARE (posix_spawn (&pid, spargs[0], NULL, NULL, spargs, newenvs), 0);
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int status;
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TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
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TEST_VERIFY (WIFEXITED (status));
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TEST_VERIFY (!WIFSIGNALED (status));
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TEST_COMPARE (WEXITSTATUS (status), 0);
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if (!disable)
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fc--;
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free (tunable);
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}
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static int
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do_test (int argc, char *argv[])
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{
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if (restart)
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handle_restart (argc - 1, &argv[1]);
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TEST_VERIFY_EXIT (argc == 2 || argc == 5);
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int i;
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for (i = 0; i < argc - 1; i++)
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spargs[i] = argv[i + 1];
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spargs[i++] = (char *) "--direct";
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spargs[i++] = (char *) "--restart";
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fc = i++;
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spargs[i] = NULL;
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unsigned long int hwcap = getauxval (AT_HWCAP);
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if (hwcap & HWCAP_LOONGARCH_LASX)
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run_test ("-LASX", "__memcpy_lasx", 1);
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if (hwcap & HWCAP_LOONGARCH_LSX)
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run_test ("-LSX", "__memcpy_lsx", 1);
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if (hwcap & HWCAP_LOONGARCH_UAL)
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run_test ("-UAL", "__memcpy_unaligned", 1);
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/* __memcpy_aligned is the default ifunc selection and will be
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* always enabled. */
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run_test ("-LASX,-LSX,-UAL", "__memcpy_aligned", 0);
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run_test ("-LASX,-LSX", "__memcpy_aligned", 0);
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run_test ("-LASX", "__memcpy_aligned", 0);
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return 0;
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}
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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30
sysdeps/unix/sysv/linux/loongarch/cpu-features.c
Normal file
30
sysdeps/unix/sysv/linux/loongarch/cpu-features.c
Normal file
@ -0,0 +1,30 @@
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/* Initialize CPU feature data. LoongArch64 version.
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This file is part of the GNU C Library.
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Copyright (C) 2024 Free Software Foundation, Inc.
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|
||||
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
|
||||
<http://www.gnu.org/licenses/>. */
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#include <cpu-features.h>
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#include <elf/dl-hwcaps.h>
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#include <elf/dl-tunables.h>
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extern void TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *) attribute_hidden;
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static inline void
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init_cpu_features (struct cpu_features *cpu_features)
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{
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GLRO(dl_larch_cpu_features).hwcap = GLRO(dl_hwcap);
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TUNABLE_GET (glibc, cpu, hwcaps, tunable_val_t *,
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TUNABLE_CALLBACK (set_hwcaps));
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}
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@ -19,12 +19,23 @@
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#ifndef _CPU_FEATURES_LOONGARCH64_H
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#define _CPU_FEATURES_LOONGARCH64_H
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#include <stdint.h>
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#include <sys/auxv.h>
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#define SUPPORT_UAL (GLRO (dl_hwcap) & HWCAP_LOONGARCH_UAL)
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#define SUPPORT_LSX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LSX)
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#define SUPPORT_LASX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LASX)
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struct cpu_features
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{
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uint64_t hwcap;
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};
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/* Get a pointer to the CPU features structure. */
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extern const struct cpu_features *
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_dl_larch_get_cpu_features (void) __attribute__ ((pure));
|
||||
|
||||
#define SUPPORT_UAL (GLRO (dl_larch_cpu_features).hwcap & HWCAP_LOONGARCH_UAL)
|
||||
#define SUPPORT_LSX (GLRO (dl_larch_cpu_features).hwcap & HWCAP_LOONGARCH_LSX)
|
||||
#define SUPPORT_LASX (GLRO (dl_larch_cpu_features).hwcap & HWCAP_LOONGARCH_LASX)
|
||||
#define RTLD_SUPPORT_LSX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LSX)
|
||||
#define RTLD_SUPPORT_LASX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LASX)
|
||||
#define INIT_ARCH()
|
||||
|
||||
#endif /* _CPU_FEATURES_LOONGARCH64_H */
|
||||
|
60
sysdeps/unix/sysv/linux/loongarch/dl-procinfo.c
Normal file
60
sysdeps/unix/sysv/linux/loongarch/dl-procinfo.c
Normal file
@ -0,0 +1,60 @@
|
||||
/* Data for LoongArch64 version of processor capability information.
|
||||
Linux version.
|
||||
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
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
/* If anything should be added here check whether the size of each string
|
||||
is still ok with the given array size.
|
||||
|
||||
All the #ifdefs in the definitions are quite irritating but
|
||||
necessary if we want to avoid duplicating the information. There
|
||||
are three different modes:
|
||||
|
||||
- PROCINFO_DECL is defined. This means we are only interested in
|
||||
declarations.
|
||||
|
||||
- PROCINFO_DECL is not defined:
|
||||
|
||||
+ if SHARED is defined the file is included in an array
|
||||
initializer. The .element = { ... } syntax is needed.
|
||||
|
||||
+ if SHARED is not defined a normal array initialization is
|
||||
needed.
|
||||
*/
|
||||
|
||||
#ifndef PROCINFO_CLASS
|
||||
# define PROCINFO_CLASS
|
||||
#endif
|
||||
|
||||
#if !IS_IN (ldconfig)
|
||||
# if !defined PROCINFO_DECL && defined SHARED
|
||||
._dl_larch_cpu_features
|
||||
# else
|
||||
PROCINFO_CLASS struct cpu_features _dl_larch_cpu_features
|
||||
# endif
|
||||
# ifndef PROCINFO_DECL
|
||||
= { }
|
||||
# endif
|
||||
# if !defined SHARED || defined PROCINFO_DECL
|
||||
;
|
||||
# else
|
||||
,
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#undef PROCINFO_DECL
|
||||
#undef PROCINFO_CLASS
|
21
sysdeps/unix/sysv/linux/loongarch/dl-sysdep.c
Normal file
21
sysdeps/unix/sysv/linux/loongarch/dl-sysdep.c
Normal file
@ -0,0 +1,21 @@
|
||||
/* Operating system support for run-time dynamic linker. LoongArch version.
|
||||
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
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <config.h>
|
||||
#include <sysdeps/loongarch/cpu-tunables.c>
|
||||
#include <sysdeps/unix/sysv/linux/dl-sysdep.c>
|
34
sysdeps/unix/sysv/linux/loongarch/libc-start.c
Normal file
34
sysdeps/unix/sysv/linux/loongarch/libc-start.c
Normal file
@ -0,0 +1,34 @@
|
||||
/* Override csu/libc-start.c on LoongArch64.
|
||||
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
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#ifndef SHARED
|
||||
|
||||
/* Mark symbols hidden in static PIE for early self relocation to work. */
|
||||
#if BUILD_PIE_DEFAULT
|
||||
# pragma GCC visibility push (hidden)
|
||||
#endif
|
||||
|
||||
#include <ldsodefs.h>
|
||||
#include <cpu-features.c>
|
||||
|
||||
extern struct cpu_features _dl_larch_cpu_features;
|
||||
|
||||
#define ARCH_INIT_CPU_FEATURES() init_cpu_features (&_dl_larch_cpu_features)
|
||||
|
||||
#endif
|
||||
#include <csu/libc-start.c>
|
Loading…
Reference in New Issue
Block a user