linux-kernel - Re: [PATCH 6/8] perf tools: Move x86__is_amd

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Message-ID: <489f89cd-ce61-4d40-84b0-755a1da4249c@linux.intel.com>
Date: Tue, 1 Oct 2024 12:03:29 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Namhyung Kim <namhyung@...nel.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>, Ian Rogers <irogers@...gle.com>
Cc: Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org,
 Ravi Bangoria <ravi.bangoria@....com>, Mark Rutland <mark.rutland@....com>,
 James Clark <james.clark@....com>, Kajol Jain <kjain@...ux.ibm.com>,
 Thomas Richter <tmricht@...ux.ibm.com>, Atish Patra <atishp@...shpatra.org>,
 Palmer Dabbelt <palmer@...osinc.com>, Mingwei Zhang <mizhang@...gle.com>
Subject: Re: [PATCH 6/8] perf tools: Move x86__is_amd_cpu() to util/env.c



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@...nel.org>
> ---
>  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 */