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authorKan Liang <kan.liang@linux.intel.com>2018-02-12 14:20:32 -0800
committerIngo Molnar <mingo@kernel.org>2018-03-09 08:22:20 +0100
commitbcfbe5c41d630ce6b74da45134cea484248b515a (patch)
tree6dafa39fc7eb4cacbeed31c2ebf4e52f2626e320 /arch
parentd31fc13fdcb20e1c317f9a7dd6273c18fbd58308 (diff)
perf/x86: Introduce a ->read() callback in 'struct x86_pmu'
Auto-reload needs to be specially handled when reading event counts. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: acme@kernel.org Link: http://lkml.kernel.org/r/1518474035-21006-3-git-send-email-kan.liang@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/events/core.c2
-rw-r--r--arch/x86/events/perf_event.h1
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 5a3ccd1715e2..00a6251981d2 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1881,6 +1881,8 @@ early_initcall(init_hw_perf_events);
static inline void x86_pmu_read(struct perf_event *event)
{
+ if (x86_pmu.read)
+ return x86_pmu.read(event);
x86_perf_event_update(event);
}
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 6495ffd57e3e..d445f0026989 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -520,6 +520,7 @@ struct x86_pmu {
void (*disable)(struct perf_event *);
void (*add)(struct perf_event *);
void (*del)(struct perf_event *);
+ void (*read)(struct perf_event *event);
int (*hw_config)(struct perf_event *event);
int (*schedule_events)(struct cpu_hw_events *cpuc, int n, int *assign);
unsigned eventsel;