Commit-ID: bcfbe5c41d630ce6b74da45134cea484248b515a Gitweb: https://git.kernel.org/tip/bcfbe5c41d630ce6b74da45134cea484248b515a Author: Kan Liang <kan.li...@linux.intel.com> AuthorDate: Mon, 12 Feb 2018 14:20:32 -0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Fri, 9 Mar 2018 08:22:20 +0100
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.li...@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Jiri Olsa <jo...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stephane Eranian <eran...@google.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Vince Weaver <vincent.wea...@maine.edu> Cc: a...@kernel.org Link: http://lkml.kernel.org/r/1518474035-21006-3-git-send-email-kan.li...@linux.intel.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/events/core.c | 2 ++ arch/x86/events/perf_event.h | 1 + 2 files changed, 3 insertions(+) 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;
