Re: [PATCH 6/8] perf tools: Move x86__is_amd_cpu() to util/env.c
From: Liang, Kan
Date: Tue Oct 01 2024 - 12:03:44 EST
On 2024-09-30 8:20 p.m., Namhyung Kim wrote:
> It can be called from non-x86 platform so let's move it to the general
> util directory. Also add a new helper perf_env__is_x86_amd_cpu() so
> that it can be called with an existing perf_env as well.
>
> Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> ---
> tools/perf/arch/x86/util/Build | 1 -
> tools/perf/arch/x86/util/env.c | 19 -------------------
> tools/perf/arch/x86/util/env.h | 7 -------
> tools/perf/arch/x86/util/pmu.c | 2 +-
> tools/perf/util/env.c | 24 ++++++++++++++++++++++++
> tools/perf/util/env.h | 4 ++++
> 6 files changed, 29 insertions(+), 28 deletions(-)
> delete mode 100644 tools/perf/arch/x86/util/env.c
> delete mode 100644 tools/perf/arch/x86/util/env.h
>
> diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
> index 2607ed5c42966543..ce6d802a1381c5ab 100644
> --- a/tools/perf/arch/x86/util/Build
> +++ b/tools/perf/arch/x86/util/Build
> @@ -10,7 +10,6 @@ perf-util-y += evlist.o
> perf-util-y += mem-events.o
> perf-util-y += evsel.o
> perf-util-y += iostat.o
> -perf-util-y += env.o
>
> perf-util-$(CONFIG_DWARF) += dwarf-regs.o
> perf-util-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o
> diff --git a/tools/perf/arch/x86/util/env.c b/tools/perf/arch/x86/util/env.c
> deleted file mode 100644
> index 3e537ffb1353aab2..0000000000000000
> --- a/tools/perf/arch/x86/util/env.c
> +++ /dev/null
> @@ -1,19 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -#include "linux/string.h"
> -#include "util/env.h"
> -#include "env.h"
> -
> -bool x86__is_amd_cpu(void)
> -{
> - struct perf_env env = { .total_mem = 0, };
> - static int is_amd; /* 0: Uninitialized, 1: Yes, -1: No */
> -
> - if (is_amd)
> - goto ret;
> -
> - perf_env__cpuid(&env);
> - is_amd = env.cpuid && strstarts(env.cpuid, "AuthenticAMD") ? 1 : -1;
> - perf_env__exit(&env);
> -ret:
> - return is_amd >= 1 ? true : false;
> -}
> diff --git a/tools/perf/arch/x86/util/env.h b/tools/perf/arch/x86/util/env.h
> deleted file mode 100644
> index d78f080b6b3f889a..0000000000000000
> --- a/tools/perf/arch/x86/util/env.h
> +++ /dev/null
> @@ -1,7 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _X86_ENV_H
> -#define _X86_ENV_H
> -
> -bool x86__is_amd_cpu(void);
> -
> -#endif /* _X86_ENV_H */
> diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
> index c3d89d6ba1bf03ad..e0060dac2a9f9242 100644
> --- a/tools/perf/arch/x86/util/pmu.c
> +++ b/tools/perf/arch/x86/util/pmu.c
> @@ -16,7 +16,7 @@
> #include "../../../util/fncache.h"
> #include "../../../util/pmus.h"
> #include "mem-events.h"
> -#include "env.h"
> +#include "util/env.h"
>
> void perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
> {
> diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> index 1edbccfc3281d2b1..470a0156e0722e4e 100644
> --- a/tools/perf/util/env.c
> +++ b/tools/perf/util/env.c
> @@ -5,6 +5,7 @@
> #include "util/header.h"
> #include "linux/compiler.h"
> #include <linux/ctype.h>
> +#include <linux/string.h>
> #include <linux/zalloc.h>
> #include "cgroup.h"
> #include <errno.h>
> @@ -625,6 +626,7 @@ char *perf_env__find_pmu_cap(struct perf_env *env, const char *pmu_name,
> return NULL;
> }
>
> +
Useless empty line.
Thanks,
Kan
> void perf_env__find_br_cntr_info(struct perf_env *env,
> unsigned int *nr,
> unsigned int *width)
> @@ -639,3 +641,25 @@ void perf_env__find_br_cntr_info(struct perf_env *env,
> env->pmu_caps->br_cntr_width;
> }
> }
> +
> +bool perf_env__is_x86_amd_cpu(struct perf_env *env)
> +{
> + static int is_amd; /* 0: Uninitialized, 1: Yes, -1: No */
> +
> + if (is_amd == 0)
> + is_amd = env->cpuid && strstarts(env->cpuid, "AuthenticAMD") ? 1 : -1;
> +
> + return is_amd >= 1 ? true : false;
> +}
> +
> +bool x86__is_amd_cpu(void)
> +{
> + struct perf_env env = { .total_mem = 0, };
> + bool is_amd;
> +
> + perf_env__cpuid(&env);
> + is_amd = perf_env__is_x86_amd_cpu(&env);
> + perf_env__exit(&env);
> +
> + return is_amd;
> +}
> diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
> index 51b36c36019be666..ae604c4edbb7eb44 100644
> --- a/tools/perf/util/env.h
> +++ b/tools/perf/util/env.h
> @@ -195,4 +195,8 @@ bool perf_env__has_pmu_mapping(struct perf_env *env, const char *pmu_name);
> void perf_env__find_br_cntr_info(struct perf_env *env,
> unsigned int *nr,
> unsigned int *width);
> +
> +bool x86__is_amd_cpu(void);
> +bool perf_env__is_x86_amd_cpu(struct perf_env *env);
> +
> #endif /* __PERF_ENV_H */