perf tool x86: Consolidate is_amd check into single function

There are multiple places where x86 specific code determines AMD vs
Intel arch and acts based on that. Consolidate those checks into a
single function.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Ananth Narayan <ananth.narayan@amd.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Santosh Shukla <santosh.shukla@amd.com>
Link: https://lore.kernel.org/r/20230613095506.547-3-ravi.bangoria@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
index 195ccfd..005907c 100644 (file)
--- a/tools/perf/arch/x86/util/Build
+++ b/tools/perf/arch/x86/util/Build
@@ -10,6 +10,7 @@ perf-y += evlist.o
 perf-y += mem-events.o
 perf-y += evsel.o
 perf-y += iostat.o
+perf-y += env.o
 
 perf-$(CONFIG_DWARF) += dwarf-regs.o
 perf-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o

diff --git a/tools/perf/arch/x86/util/env.c b/tools/perf/arch/x86/util/env.c
new file mode 100644 (file)
index 0000000..33b87f8
--- /dev/null
+++ b/tools/perf/arch/x86/util/env.c
@@ -0,0 +1,19 @@
+// 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;
+
+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
new file mode 100644 (file)
index 0000000..d78f080
--- /dev/null
+++ b/tools/perf/arch/x86/util/env.h
@@ -0,0 +1,7 @@
+/* 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/evsel.c b/tools/perf/arch/x86/util/evsel.c
index 25da46c..512c2d8 100644 (file)
--- a/tools/perf/arch/x86/util/evsel.c
+++ b/tools/perf/arch/x86/util/evsel.c
@@ -8,6 +8,7 @@
 #include "linux/string.h"
 #include "evsel.h"
 #include "util/debug.h"
+#include "env.h"
 
 #define IBS_FETCH_L3MISSONLY   (1ULL << 59)
 #define IBS_OP_L3MISSONLY      (1ULL << 16)
@@ -78,23 +79,10 @@ void arch__post_evsel_config(struct evsel *evsel, struct perf_event_attr *attr)
 {
        struct perf_pmu *evsel_pmu, *ibs_fetch_pmu, *ibs_op_pmu;
        static int warned_once;
-       /* 0: Uninitialized, 1: Yes, -1: No */
-       static int is_amd;
 
-       if (warned_once || is_amd == -1)
+       if (warned_once || !x86__is_amd_cpu())
                return;
 
-       if (!is_amd) {
-               struct perf_env *env = evsel__env(evsel);
-
-               if (!perf_env__cpuid(env) || !env->cpuid ||
-                   !strstarts(env->cpuid, "AuthenticAMD")) {
-                       is_amd = -1;
-                       return;
-               }
-               is_amd = 1;
-       }
-
        evsel_pmu = evsel__find_pmu(evsel);
        if (!evsel_pmu)
                return;

diff --git a/tools/perf/arch/x86/util/mem-events.c b/tools/perf/arch/x86/util/mem-events.c
index 32879d1..a8a782b 100644 (file)
--- a/tools/perf/arch/x86/util/mem-events.c
+++ b/tools/perf/arch/x86/util/mem-events.c
@@ -5,6 +5,7 @@
 #include "map_symbol.h"
 #include "mem-events.h"
 #include "linux/string.h"
+#include "env.h"
 
 static char mem_loads_name[100];
 static bool mem_loads_name__init;
@@ -27,28 +28,12 @@ static struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX] = {
        E("mem-ldst",   "ibs_op//",     "ibs_op"),
 };
 
-static int perf_mem_is_amd_cpu(void)
-{
-       struct perf_env env = { .total_mem = 0, };
-
-       perf_env__cpuid(&env);
-       if (env.cpuid && strstarts(env.cpuid, "AuthenticAMD"))
-               return 1;
-       return -1;
-}
-
 struct perf_mem_event *perf_mem_events__ptr(int i)
 {
-       /* 0: Uninitialized, 1: Yes, -1: No */
-       static int is_amd;
-
        if (i >= PERF_MEM_EVENTS__MAX)
                return NULL;
 
-       if (!is_amd)
-               is_amd = perf_mem_is_amd_cpu();
-
-       if (is_amd == 1)
+       if (x86__is_amd_cpu())
                return &perf_mem_events_amd[i];
 
        return &perf_mem_events_intel[i];