perf pmu: Unbreak perf record for arm/arm64 with events with explicit PMU

Currently, perf record is broken on arm/arm64 systems when the PMU is
specified explicitly as part of the event, e.g.

$ ./perf record -e armv8_cortex_a53/cpu_cycles/u true

In such cases, perf record fails to open events unless
perf_event_paranoid is set to -1, even if the PMU in question supports
mode exclusion. Further, even when perf_event_paranoid is toggled, no
samples are recorded.

This is an unintended side effect of commit:

  e3ba76deef23064f ("perf tools: Force uncore events to system wide monitoring)

... which assumes that if a PMU has an associated cpu_map, it is an
uncore PMU, and forces events for such PMUs to be system-wide.

This is not true for arm/arm64 systems, which can have heterogeneous
CPUs. To account for this, multiple CPU PMUs are exposed, each with a
"cpus" field under sysfs, which the perf tool parses into a cpu_map. ARM
PMUs do not have a "cpumask" file, and only have a "cpus" file. For the
gory details as to why, see commit:

 7e3fcffe95544010 ("perf pmu: Support alternative sysfs cpumask")

Given all of this, we can instead identify uncore PMUs by explicitly
checking for a "cpumask" file, and restore arm/arm64 PMU support back to
a working state. This patch does so, adding a new perf_pmu::is_uncore
field, and splitting the existing cpumask parsing so that it can be
reused.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by Will Deacon <will.deacon@arm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: 4.12+ <stable@vger.kernel.org>
Fixes: e3ba76deef23064f ("perf tools: Force uncore events to system wide monitoring)
Link: http://lkml.kernel.org/r/1507315102-5942-1-git-send-email-mark.rutland@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index f6257fb..39b1596 100644 (file)
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -309,10 +309,11 @@ static char *get_config_name(struct list_head *head_terms)
 static struct perf_evsel *
 __add_event(struct list_head *list, int *idx,
            struct perf_event_attr *attr,
-           char *name, struct cpu_map *cpus,
+           char *name, struct perf_pmu *pmu,
            struct list_head *config_terms, bool auto_merge_stats)
 {
        struct perf_evsel *evsel;
+       struct cpu_map *cpus = pmu ? pmu->cpus : NULL;
 
        event_attr_init(attr);
 
@@ -323,7 +324,7 @@ __add_event(struct list_head *list, int *idx,
        (*idx)++;
        evsel->cpus        = cpu_map__get(cpus);
        evsel->own_cpus    = cpu_map__get(cpus);
-       evsel->system_wide = !!cpus;
+       evsel->system_wide = pmu ? pmu->is_uncore : false;
        evsel->auto_merge_stats = auto_merge_stats;
 
        if (name)
@@ -1233,7 +1234,7 @@ static int __parse_events_add_pmu(struct parse_events_state *parse_state,
 
        if (!head_config) {
                attr.type = pmu->type;
-               evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu->cpus, NULL, auto_merge_stats);
+               evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu, NULL, auto_merge_stats);
                return evsel ? 0 : -ENOMEM;
        }
 
@@ -1254,7 +1255,7 @@ static int __parse_events_add_pmu(struct parse_events_state *parse_state,
                return -EINVAL;
 
        evsel = __add_event(list, &parse_state->idx, &attr,
-                           get_config_name(head_config), pmu->cpus,
+                           get_config_name(head_config), pmu,
                            &config_terms, auto_merge_stats);
        if (evsel) {
                evsel->unit = info.unit;

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index ac16a9d..1c4d7b4 100644 (file)
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -470,17 +470,36 @@ static void pmu_read_sysfs(void)
        closedir(dir);
 }
 
+static struct cpu_map *__pmu_cpumask(const char *path)
+{
+       FILE *file;
+       struct cpu_map *cpus;
+
+       file = fopen(path, "r");
+       if (!file)
+               return NULL;
+
+       cpus = cpu_map__read(file);
+       fclose(file);
+       return cpus;
+}
+
+/*
+ * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
+ * may have a "cpus" file.
+ */
+#define CPUS_TEMPLATE_UNCORE   "%s/bus/event_source/devices/%s/cpumask"
+#define CPUS_TEMPLATE_CPU      "%s/bus/event_source/devices/%s/cpus"
+
 static struct cpu_map *pmu_cpumask(const char *name)
 {
-       struct stat st;
        char path[PATH_MAX];
-       FILE *file;
        struct cpu_map *cpus;
        const char *sysfs = sysfs__mountpoint();
        const char *templates[] = {
-                "%s/bus/event_source/devices/%s/cpumask",
-                "%s/bus/event_source/devices/%s/cpus",
-                NULL
+               CPUS_TEMPLATE_UNCORE,
+               CPUS_TEMPLATE_CPU,
+               NULL
        };
        const char **template;
 
@@ -489,20 +508,25 @@ static struct cpu_map *pmu_cpumask(const char *name)
 
        for (template = templates; *template; template++) {
                snprintf(path, PATH_MAX, *template, sysfs, name);
-               if (stat(path, &st) == 0)
-                       break;
+               cpus = __pmu_cpumask(path);
+               if (cpus)
+                       return cpus;
        }
 
-       if (!*template)
-               return NULL;
+       return NULL;
+}
 
-       file = fopen(path, "r");
-       if (!file)
-               return NULL;
+static bool pmu_is_uncore(const char *name)
+{
+       char path[PATH_MAX];
+       struct cpu_map *cpus;
+       const char *sysfs = sysfs__mountpoint();
 
-       cpus = cpu_map__read(file);
-       fclose(file);
-       return cpus;
+       snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name);
+       cpus = __pmu_cpumask(path);
+       cpu_map__put(cpus);
+
+       return !!cpus;
 }
 
 /*
@@ -617,6 +641,8 @@ static struct perf_pmu *pmu_lookup(const char *name)
 
        pmu->cpus = pmu_cpumask(name);
 
+       pmu->is_uncore = pmu_is_uncore(name);
+
        INIT_LIST_HEAD(&pmu->format);
        INIT_LIST_HEAD(&pmu->aliases);
        list_splice(&format, &pmu->format);

diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 389e972..fe0de05 100644 (file)
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -22,6 +22,7 @@ struct perf_pmu {
        char *name;
        __u32 type;
        bool selectable;
+       bool is_uncore;
        struct perf_event_attr *default_config;
        struct cpu_map *cpus;
        struct list_head format;  /* HEAD struct perf_pmu_format -> list */