linux-kernel - [PATCH 3/7] perf, x86: modify some code to allow the introduction of ibs events

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Message-ID: <1274304024-6551-4-git-send-email-robert.richter@amd.com>
Date:	Wed, 19 May 2010 23:20:20 +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 3/7] 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 75c0a44..e64502c 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -283,7 +283,7 @@ 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;
 
 	/*
@@ -775,10 +775,10 @@ 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
@@ -786,9 +786,9 @@ 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;
 	}
 }
 
@@ -891,7 +891,7 @@ 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;
 
 	/*
-- 
1.7.1


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