perf arm64 header: Use cpu argument in get_cpuid

Use the cpu to read the MIDR file requested. If the "any" value (-1) is
passed that keep the behavior of returning the first MIDR file that can
be read.

Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Xu Yang <xu.yang_2@nxp.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ben Zong-You Xie <ben717@andestech.com>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Clément Le Goffic <clement.legoffic@foss.st.com>
Cc: Dima Kogan <dima@secretsauce.net>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-riscv@lists.infradead.org
Link: https://lore.kernel.org/r/20241107162035.52206-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/arch/arm64/util/header.c b/tools/perf/arch/arm64/util/header.c
index 760c217..f0907da 100644 (file)
--- a/tools/perf/arch/arm64/util/header.c
+++ b/tools/perf/arch/arm64/util/header.c
@@ -14,55 +14,52 @@
 #define MIDR_REVISION_MASK      GENMASK(3, 0)
 #define MIDR_VARIANT_MASK      GENMASK(23, 20)
 
-static int _get_cpuid(char *buf, size_t sz, struct perf_cpu_map *cpus)
+static int _get_cpuid(char *buf, size_t sz, struct perf_cpu cpu)
 {
+       char path[PATH_MAX];
+       FILE *file;
        const char *sysfs = sysfs__mountpoint();
-       struct perf_cpu cpu;
-       int idx, ret = EINVAL;
 
+       assert(cpu.cpu != -1);
        if (!sysfs || sz < MIDR_SIZE)
                return EINVAL;
 
-       perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
-               char path[PATH_MAX];
-               FILE *file;
-
-               scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d" MIDR,
-                         sysfs, cpu.cpu);
-
-               file = fopen(path, "r");
-               if (!file) {
-                       pr_debug("fopen failed for file %s\n", path);
-                       continue;
-               }
-
-               if (!fgets(buf, MIDR_SIZE, file)) {
-                       fclose(file);
-                       continue;
-               }
-               fclose(file);
+       scnprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d" MIDR, sysfs, cpu.cpu);
 
-               /* got midr break loop */
-               ret = 0;
-               break;
+       file = fopen(path, "r");
+       if (!file) {
+               pr_debug("fopen failed for file %s\n", path);
+               return EINVAL;
        }
 
-       return ret;
+       if (!fgets(buf, MIDR_SIZE, file)) {
+               pr_debug("Failed to read file %s\n", path);
+               fclose(file);
+               return EINVAL;
+       }
+       fclose(file);
+       return 0;
 }
 
-int get_cpuid(char *buf, size_t sz, struct perf_cpu cpu __maybe_unused)
+int get_cpuid(char *buf, size_t sz, struct perf_cpu cpu)
 {
-       struct perf_cpu_map *cpus = perf_cpu_map__new_online_cpus();
-       int ret;
+       struct perf_cpu_map *cpus;
+       int idx;
+
+       if (cpu.cpu != -1)
+               return _get_cpuid(buf, sz, cpu);
 
+       cpus = perf_cpu_map__new_online_cpus();
        if (!cpus)
                return EINVAL;
 
-       ret = _get_cpuid(buf, sz, cpus);
-
-       perf_cpu_map__put(cpus);
+       perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
+               int ret = _get_cpuid(buf, sz, cpu);
 
-       return ret;
+               if (ret == 0)
+                       return 0;
+       }
+       return EINVAL;
 }
 
 char *get_cpuid_str(struct perf_pmu *pmu)
@@ -78,7 +75,7 @@ char *get_cpuid_str(struct perf_pmu *pmu)
                return NULL;
 
        /* read midr from list of cpus mapped to this pmu */
-       res = _get_cpuid(buf, MIDR_SIZE, pmu->cpus);
+       res = get_cpuid(buf, MIDR_SIZE, perf_cpu_map__min(pmu->cpus));
        if (res) {
                pr_err("failed to get cpuid string for PMU %s\n", pmu->name);
                free(buf);

diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index b77f89d..3bb7684 100644 (file)
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -11,6 +11,7 @@
 #include <linux/types.h>
 #include "env.h"
 #include "pmu.h"
+#include <perf/cpumap.h>
 
 enum {
        HEADER_RESERVED         = 0,    /* always cleared */