perf header: Support num and width of branch counters

To support the branch counters feature, the information of the maximum
number of supported counters and the width of the counters is exposed in
the sysfs caps folder. The perf tool can use the information to parse
the logged counters in each branch.

Store the information in the perf_env for later usage.

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tinghao Zhang <tinghao.zhang@intel.com>
Link: https://lore.kernel.org/r/20231025201626.3000228-7-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 4566c51..48d7f87 100644 (file)
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -46,6 +46,9 @@ struct hybrid_node {
 struct pmu_caps {
        int             nr_caps;
        unsigned int    max_branches;
+       unsigned int    br_cntr_nr;
+       unsigned int    br_cntr_width;
+
        char            **caps;
        char            *pmu_name;
 };
@@ -62,6 +65,8 @@ struct perf_env {
        unsigned long long      total_mem;
        unsigned int            msr_pmu_type;
        unsigned int            max_branches;
+       unsigned int            br_cntr_nr;
+       unsigned int            br_cntr_width;
        int                     kernel_is_64_bit;
 
        int                     nr_cmdline;

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e86b943..eeb96a1 100644 (file)
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3259,7 +3259,9 @@ static int process_compressed(struct feat_fd *ff,
 }
 
 static int __process_pmu_caps(struct feat_fd *ff, int *nr_caps,
-                             char ***caps, unsigned int *max_branches)
+                             char ***caps, unsigned int *max_branches,
+                             unsigned int *br_cntr_nr,
+                             unsigned int *br_cntr_width)
 {
        char *name, *value, *ptr;
        u32 nr_pmu_caps, i;
@@ -3294,6 +3296,12 @@ static int __process_pmu_caps(struct feat_fd *ff, int *nr_caps,
                if (!strcmp(name, "branches"))
                        *max_branches = atoi(value);
 
+               if (!strcmp(name, "branch_counter_nr"))
+                       *br_cntr_nr = atoi(value);
+
+               if (!strcmp(name, "branch_counter_width"))
+                       *br_cntr_width = atoi(value);
+
                free(value);
                free(name);
        }
@@ -3318,7 +3326,9 @@ static int process_cpu_pmu_caps(struct feat_fd *ff,
 {
        int ret = __process_pmu_caps(ff, &ff->ph->env.nr_cpu_pmu_caps,
                                     &ff->ph->env.cpu_pmu_caps,
-                                    &ff->ph->env.max_branches);
+                                    &ff->ph->env.max_branches,
+                                    &ff->ph->env.br_cntr_nr,
+                                    &ff->ph->env.br_cntr_width);
 
        if (!ret && !ff->ph->env.cpu_pmu_caps)
                pr_debug("cpu pmu capabilities not available\n");
@@ -3347,7 +3357,9 @@ static int process_pmu_caps(struct feat_fd *ff, void *data __maybe_unused)
        for (i = 0; i < nr_pmu; i++) {
                ret = __process_pmu_caps(ff, &pmu_caps[i].nr_caps,
                                         &pmu_caps[i].caps,
-                                        &pmu_caps[i].max_branches);
+                                        &pmu_caps[i].max_branches,
+                                        &pmu_caps[i].br_cntr_nr,
+                                        &pmu_caps[i].br_cntr_width);
                if (ret)
                        goto err;