perf/x86/uncore: add ability to customize pmu callbacks

This patch enables custom struct pmu callbacks per uncore
PMU types. This feature may be used to simplify counter
setup for certain uncore PMUs which have free running
counters for instance. It becomes possible to bypass
the event scheduling phase of the configuration.

Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: ak@linux.intel.com
Cc: zheng.z.yan@intel.com
Cc: peterz@infradead.org
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1392132015-14521-3-git-send-email-eranian@google.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 16 insertions, 10 deletions

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index fe4255b9be55..e6f32b36c9be 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -3271,16 +3271,21 @@ static int __init uncore_pmu_register(struct intel_uncore_pmu *pmu)
 {
         int ret;
 
-        pmu->pmu = (struct pmu) {
-                .attr_groups    = pmu->type->attr_groups,
-                .task_ctx_nr    = perf_invalid_context,
-                .event_init     = uncore_pmu_event_init,
-                .add            = uncore_pmu_event_add,
-                .del            = uncore_pmu_event_del,
-                .start          = uncore_pmu_event_start,
-                .stop           = uncore_pmu_event_stop,
-                .read           = uncore_pmu_event_read,
-        };
+        if (!pmu->type->pmu) {
+                pmu->pmu = (struct pmu) {
+                        .attr_groups    = pmu->type->attr_groups,
+                        .task_ctx_nr    = perf_invalid_context,
+                        .event_init     = uncore_pmu_event_init,
+                        .add            = uncore_pmu_event_add,
+                        .del            = uncore_pmu_event_del,
+                        .start          = uncore_pmu_event_start,
+                        .stop           = uncore_pmu_event_stop,
+                        .read           = uncore_pmu_event_read,
+                };
+        } else {
+                pmu->pmu = *pmu->type->pmu;
+                pmu->pmu.attr_groups = pmu->type->attr_groups;
+        }
 
         if (pmu->type->num_boxes == 1) {
                 if (strlen(pmu->type->name) > 0)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.h b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
index a80ab71a883d..77dc9a575fd9 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.h
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.h
@@ -440,6 +440,7 @@ struct intel_uncore_type {
         struct intel_uncore_ops *ops;
         struct uncore_event_desc *event_descs;
         const struct attribute_group *attr_groups[4];
+        struct pmu *pmu; /* for custom pmu ops */
 };
 
 #define pmu_group attr_groups[0]