Commit-ID: fe4a330885aee20f233de36085fb15c38094e635
Gitweb: http://git.kernel.org/tip/fe4a330885aee20f233de36085fb15c38094e635
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Sun, 20 Nov 2011 20:44:06 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 21 Dec 2011 11:01:10 +0100
perf, x86: Implement user-space RDPMC support, to allow fast, user-space access to self-monitoring counters
Implement a correct pmu::event_idx for the x86 counter index rules and
set CR4.PCE on CPU_STARTING.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Arun Sharma <asharma@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-mwxab34dibqgzk5zywutfnha@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/cpu/perf_event.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 5adce10..53b5699 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1210,6 +1210,7 @@ x86_pmu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
break;
case CPU_STARTING:
+ set_in_cr4(X86_CR4_PCE);
if (x86_pmu.cpu_starting)
x86_pmu.cpu_starting(cpu);
break;
@@ -1542,6 +1543,18 @@ static int x86_pmu_event_init(struct perf_event *event)
return err;
}
+static int x86_pmu_event_idx(struct perf_event *event)
+{
+ int idx = event->hw.idx;
+
+ if (x86_pmu.num_counters_fixed && idx >= X86_PMC_IDX_FIXED) {
+ idx -= X86_PMC_IDX_FIXED;
+ idx |= 1 << 30;
+ }
+
+ return idx + 1;
+}
+
static struct pmu pmu = {
.pmu_enable = x86_pmu_enable,
.pmu_disable = x86_pmu_disable,
@@ -1557,6 +1570,8 @@ static struct pmu pmu = {
.start_txn = x86_pmu_start_txn,
.cancel_txn = x86_pmu_cancel_txn,
.commit_txn = x86_pmu_commit_txn,
+
+ .event_idx = x86_pmu_event_idx,
};
/*
--
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