perf/x86: Add support for sampling PEBS machine state registers

PEBS can capture machine state regs at retiremnt of the sampled
instructions. When precise sampling is enabled on an event, PEBS
is used, so substitute the interrupted state with the PEBS state.
Note that not all registers are captured by PEBS. Those missing
are replaced by the interrupt state counter-parts.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1411559322-16548-3-git-send-email-eranian@google.com
Cc: cebbert.lkml@gmail.com
Cc: jolsa@redhat.com
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 3c5d5c10b8a964d48f24cc99e1198f018c8a7ced..495ae9793628fb6e9ed324e97c16fbc34fc83f13 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -886,6 +886,29 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
        regs.bp = pebs->bp;
        regs.sp = pebs->sp;
 
+       if (sample_type & PERF_SAMPLE_REGS_INTR) {
+               regs.ax = pebs->ax;
+               regs.bx = pebs->bx;
+               regs.cx = pebs->cx;
+               regs.dx = pebs->dx;
+               regs.si = pebs->si;
+               regs.di = pebs->di;
+               regs.bp = pebs->bp;
+               regs.sp = pebs->sp;
+
+               regs.flags = pebs->flags;
+#ifndef CONFIG_X86_32
+               regs.r8 = pebs->r8;
+               regs.r9 = pebs->r9;
+               regs.r10 = pebs->r10;
+               regs.r11 = pebs->r11;
+               regs.r12 = pebs->r12;
+               regs.r13 = pebs->r13;
+               regs.r14 = pebs->r14;
+               regs.r15 = pebs->r15;
+#endif
+       }
+
        if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) {
                regs.ip = pebs->real_ip;
                regs.flags |= PERF_EFLAGS_EXACT;