linux-kernel - [PATCH 08/12] perf, x86: modify some code to allow the introduction of ibs events

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Date:	Tue, 13 Apr 2010 22:23:17 +0200
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Ingo Molnar <mingo@...e.hu>, Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Robert Richter <robert.richter@....com>
Subject: [PATCH 08/12] perf, x86: modify some code to allow the introduction of ibs events

The changes are needed to introduce ibs events that are implemented as
special x86 events.

Signed-off-by: Robert Richter <robert.richter@....com>
---
 arch/x86/kernel/cpu/perf_event.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 2a7c2fc..67b99a9 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -281,7 +281,7 @@ x86_perf_event_update(struct perf_event *event)
 	int idx = hwc->idx;
 	s64 delta;
 
-	if (idx == X86_PMC_IDX_SPECIAL_BTS)
+	if (idx >= X86_PMC_IDX_SPECIAL)
 		return 0;
 
 	/*
@@ -758,10 +758,10 @@ static inline void x86_assign_hw_event(struct perf_event *event,
 	hwc->last_cpu = smp_processor_id();
 	hwc->last_tag = ++cpuc->tags[i];
 
-	if (hwc->idx == X86_PMC_IDX_SPECIAL_BTS) {
-		hwc->config_base = 0;
-		hwc->event_base	= 0;
-	} else if (hwc->idx >= X86_PMC_IDX_FIXED) {
+	if (hwc->idx < X86_PMC_IDX_FIXED) {
+		hwc->config_base = x86_pmu.eventsel;
+		hwc->event_base  = x86_pmu.perfctr;
+	} else if (hwc->idx < X86_PMC_IDX_SPECIAL) {
 		hwc->config_base = MSR_ARCH_PERFMON_FIXED_CTR_CTRL;
 		/*
 		 * We set it so that event_base + idx in wrmsr/rdmsr maps to
@@ -769,9 +769,9 @@ static inline void x86_assign_hw_event(struct perf_event *event,
 		 */
 		hwc->event_base =
 			MSR_ARCH_PERFMON_FIXED_CTR0 - X86_PMC_IDX_FIXED;
-	} else {
-		hwc->config_base = x86_pmu.eventsel;
-		hwc->event_base  = x86_pmu.perfctr;
+	} else if (hwc->idx == X86_PMC_IDX_SPECIAL_BTS) {
+		hwc->config_base = 0;
+		hwc->event_base	= 0;
 	}
 }
 
@@ -874,7 +874,7 @@ x86_perf_event_set_period(struct perf_event *event)
 	s64 period = hwc->sample_period;
 	int ret = 0, idx = hwc->idx;
 
-	if (idx == X86_PMC_IDX_SPECIAL_BTS)
+	if (idx >= X86_PMC_IDX_SPECIAL_BTS)
 		return 0;
 
 	/*
-- 
1.7.0.3


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