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Date: Fri, 26 Mar 2010 14:08:44 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: LKML <linux-kernel@...r.kernel.org>,
Stephane Eranian <eranian@...gle.com>
Subject: [PATCH] perf, x86: Add Nehelem PMU programming errata workaround
Subject: perf, x86: Add Nehelem PMU programming errata workaround
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Fri Mar 26 13:59:41 CET 2010
Implement the workaround for Intel Errata AAK100 and AAP53.
Also, remove the Core-i7 name for Nehalem events since there are also
Westmere based i7 chips.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
(compile tested only, since I don't actually have an affected chip)
arch/x86/kernel/cpu/perf_event.c | 8 +++---
arch/x86/kernel/cpu/perf_event_intel.c | 43 +++++++++++++++++++++++++++++----
arch/x86/kernel/cpu/perf_event_p4.c | 2 -
arch/x86/kernel/cpu/perf_event_p6.c | 2 -
4 files changed, 45 insertions(+), 10 deletions(-)
Index: linux-2.6/arch/x86/kernel/cpu/perf_event.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/perf_event.c
+++ linux-2.6/arch/x86/kernel/cpu/perf_event.c
@@ -185,7 +185,7 @@ struct x86_pmu {
int version;
int (*handle_irq)(struct pt_regs *);
void (*disable_all)(void);
- void (*enable_all)(void);
+ void (*enable_all)(int added);
void (*enable)(struct perf_event *);
void (*disable)(struct perf_event *);
int (*hw_config)(struct perf_event_attr *attr, struct hw_perf_event *hwc);
@@ -577,7 +577,7 @@ void hw_perf_disable(void)
x86_pmu.disable_all();
}
-static void x86_pmu_enable_all(void)
+static void x86_pmu_enable_all(int added)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
int idx;
@@ -785,7 +785,7 @@ void hw_perf_enable(void)
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct perf_event *event;
struct hw_perf_event *hwc;
- int i;
+ int i, added = cpuc->n_added;
if (!x86_pmu_initialized())
return;
@@ -837,7 +837,7 @@ void hw_perf_enable(void)
cpuc->enabled = 1;
barrier();
- x86_pmu.enable_all();
+ x86_pmu.enable_all(added);
}
static inline void __x86_pmu_enable_event(struct hw_perf_event *hwc)
Index: linux-2.6/arch/x86/kernel/cpu/perf_event_intel.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/perf_event_intel.c
+++ linux-2.6/arch/x86/kernel/cpu/perf_event_intel.c
@@ -483,7 +483,7 @@ static void intel_pmu_disable_all(void)
intel_pmu_lbr_disable_all();
}
-static void intel_pmu_enable_all(void)
+static void intel_pmu_enable_all(int added)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
@@ -502,6 +502,40 @@ static void intel_pmu_enable_all(void)
}
}
+/*
+ * Workaround for:
+ * Intel Errata AAK100 (model 26)
+ * Intel Errata AAP53 (model 30)
+ *
+ * These chips need to be 'reset' when adding counters by programming
+ * the magic three (non counting) events 0x4300D2, 0x4300B1 and 0x4300B5
+ * either in sequence on the same PMC or on different PMCs.
+ */
+static void intel_pmu_nhm_enable_all(int added)
+{
+ if (added) {
+ struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+ int i;
+
+ wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + 0, 0x4300D2);
+ wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + 1, 0x4300B1);
+ wrmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + 2, 0x4300B5);
+
+ wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0x3);
+ wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0x0);
+
+ for (i = 0; i < 3; i++) {
+ struct perf_event *event = cpuc->events[i];
+
+ if (!event)
+ continue;
+
+ __x86_pmu_enable_event(&event->hw);
+ }
+ }
+ intel_pmu_enable_all(added);
+}
+
static inline u64 intel_pmu_get_status(void)
{
u64 status;
@@ -658,7 +692,7 @@ static int intel_pmu_handle_irq(struct p
intel_pmu_drain_bts_buffer();
status = intel_pmu_get_status();
if (!status) {
- intel_pmu_enable_all();
+ intel_pmu_enable_all(0);
return 0;
}
@@ -707,7 +741,7 @@ again:
goto again;
done:
- intel_pmu_enable_all();
+ intel_pmu_enable_all(0);
return 1;
}
@@ -920,7 +954,8 @@ static __init int intel_pmu_init(void)
intel_pmu_lbr_init_nhm();
x86_pmu.event_constraints = intel_nehalem_event_constraints;
- pr_cont("Nehalem/Corei7 events, ");
+ x86_pmu.enable_all = intel_pmu_nhm_enable_all;
+ pr_cont("Nehalem events, ");
break;
case 28: /* Atom */
Index: linux-2.6/arch/x86/kernel/cpu/perf_event_p4.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/perf_event_p4.c
+++ linux-2.6/arch/x86/kernel/cpu/perf_event_p4.c
@@ -423,7 +423,7 @@ static void p4_pmu_enable_event(struct p
(u64)(p4_config_unpack_cccr(hwc->config)) | P4_CCCR_ENABLE);
}
-static void p4_pmu_enable_all(void)
+static void p4_pmu_enable_all(int added)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
int idx;
Index: linux-2.6/arch/x86/kernel/cpu/perf_event_p6.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/perf_event_p6.c
+++ linux-2.6/arch/x86/kernel/cpu/perf_event_p6.c
@@ -66,7 +66,7 @@ static void p6_pmu_disable_all(void)
wrmsrl(MSR_P6_EVNTSEL0, val);
}
-static void p6_pmu_enable_all(void)
+static void p6_pmu_enable_all(int added)
{
unsigned long val;
--
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