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Date: Tue, 19 Jun 2012 20:10:46 +0200
From: Robert Richter <robert.richter@....com>
To: Ingo Molnar <mingo@...nel.org>
CC: Peter Zijlstra <peterz@...radead.org>,
Stephane Eranian <eranian@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
Robert Richter <robert.richter@....com>
Subject: [PATCH 08/10] perf, amd: Enable northbridge counters on family 15h
This patch enables northbridge counter support for family 15h cpus.
Northbridge counters on family 15h have a separate counter bit mask
and constraints. NB counters are enabled if the nb performance counter
extensions cpuid flag is set.
Signed-off-by: Robert Richter <robert.richter@....com>
---
arch/x86/include/asm/cpufeature.h | 2 +
arch/x86/include/asm/perf_event.h | 3 ++
arch/x86/kernel/cpu/perf_event.c | 21 +++++++++++++++-
arch/x86/kernel/cpu/perf_event_amd.c | 42 +++++++++++++++++++++++++++------
4 files changed, 58 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 340ee49..404bb64 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -164,6 +164,7 @@
#define X86_FEATURE_TBM (6*32+21) /* trailing bit manipulations */
#define X86_FEATURE_TOPOEXT (6*32+22) /* topology extensions CPUID leafs */
#define X86_FEATURE_PERFCTR_CORE (6*32+23) /* core performance counter extensions */
+#define X86_FEATURE_PERFCTR_NB (6*32+24) /* nb performance counter extensions */
/*
* Auxiliary flags: Linux defined - For features scattered in various
@@ -301,6 +302,7 @@ extern const char * const x86_power_flags[32];
#define cpu_has_hypervisor boot_cpu_has(X86_FEATURE_HYPERVISOR)
#define cpu_has_pclmulqdq boot_cpu_has(X86_FEATURE_PCLMULQDQ)
#define cpu_has_perfctr_core boot_cpu_has(X86_FEATURE_PERFCTR_CORE)
+#define cpu_has_perfctr_nb boot_cpu_has(X86_FEATURE_PERFCTR_NB)
#define cpu_has_cx8 boot_cpu_has(X86_FEATURE_CX8)
#define cpu_has_cx16 boot_cpu_has(X86_FEATURE_CX16)
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index ffdf5e0..637a72b7 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -9,6 +9,8 @@
#define INTEL_PMC_MAX_FIXED 3
#define INTEL_PMC_IDX_FIXED 32
+#define AMD64_PMC_IDX_NB 32
+
#define X86_PMC_IDX_MAX 64
#define MSR_ARCH_PERFMON_PERFCTR0 0xc1
@@ -48,6 +50,7 @@
AMD64_EVENTSEL_EVENT)
#define AMD64_NUM_COUNTERS 4
#define AMD64_NUM_COUNTERS_CORE 6
+#define AMD64_NUM_COUNTERS_NB 4
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_SEL 0x3c
#define ARCH_PERFMON_UNHALTED_CORE_CYCLES_UMASK (0x00 << 8)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 9fbf70a..1d59cac 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -805,6 +805,13 @@ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader,
return n;
}
+static inline int x86_pmu_rdpmc_index(int index)
+{
+ if (cpu_has_perfctr_nb && (index >= AMD64_PMC_IDX_NB))
+ return index - AMD64_PMC_IDX_NB + AMD64_NUM_COUNTERS_CORE;
+ return index;
+}
+
static inline void x86_assign_hw_event(struct perf_event *event,
struct cpu_hw_events *cpuc, int i)
{
@@ -824,7 +831,7 @@ static inline void x86_assign_hw_event(struct perf_event *event,
} else {
hwc->config_base = x86_pmu_config_addr(hwc->idx);
hwc->event_base = x86_pmu_event_addr(hwc->idx);
- hwc->event_base_rdpmc = hwc->idx;
+ hwc->event_base_rdpmc = x86_pmu_rdpmc_index(hwc->idx);
}
}
@@ -1194,7 +1201,17 @@ int x86_pmu_handle_irq(struct pt_regs *regs)
* might still deliver spurious interrupts still
* in flight. Catch them:
*/
- if (__test_and_clear_bit(idx, cpuc->running))
+ if (idx >= AMD64_PMC_IDX_NB && cpuc->amd_nb && cpuc->amd_nb->owners[idx]) {
+ /*
+ * AMD NB counters send nmis to all
+ * cpus on the node. Fix this later:
+ * This swallows all nmis on the node
+ * if a nb counter is active and even
+ * if there was no overflow.
+ */
+ handled++;
+ __set_bit(idx, cpuc->running);
+ } else if (__test_and_clear_bit(idx, cpuc->running))
handled++;
continue;
}
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index e538512..7a870d2 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -7,6 +7,9 @@
#include "perf_event.h"
+#define AMD64_COUNTERS_MASK_NB \
+ (((1ULL << AMD64_NUM_COUNTERS_NB) - 1) << AMD64_PMC_IDX_NB)
+
static __initconst const u64 amd_hw_cache_event_ids
[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
@@ -461,12 +464,13 @@ static struct attribute *amd_format_attr[] = {
* (**) only one unitmask enabled at a time
*/
-static struct event_constraint amd_f15_PMC0 = EVENT_CONSTRAINT(0, 0x01, 0);
-static struct event_constraint amd_f15_PMC20 = EVENT_CONSTRAINT(0, 0x07, 0);
-static struct event_constraint amd_f15_PMC3 = EVENT_CONSTRAINT(0, 0x08, 0);
-static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0);
-static struct event_constraint amd_f15_PMC50 = EVENT_CONSTRAINT(0, 0x3F, 0);
-static struct event_constraint amd_f15_PMC53 = EVENT_CONSTRAINT(0, 0x38, 0);
+static struct event_constraint amd_f15_PMC0 = EVENT_CONSTRAINT(0, 0x01, 0);
+static struct event_constraint amd_f15_PMC20 = EVENT_CONSTRAINT(0, 0x07, 0);
+static struct event_constraint amd_f15_PMC3 = EVENT_CONSTRAINT(0, 0x08, 0);
+static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0);
+static struct event_constraint amd_f15_PMC50 = EVENT_CONSTRAINT(0, 0x3F, 0);
+static struct event_constraint amd_f15_PMC53 = EVENT_CONSTRAINT(0, 0x38, 0);
+static struct event_constraint amd_f15_NBPMC30 = EVENT_CONSTRAINT(0, AMD64_COUNTERS_MASK_NB, 0);
static struct event_constraint *
__amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, struct perf_event *event)
@@ -533,8 +537,7 @@ __amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, struct perf_event *
return &amd_f15_PMC20;
}
case AMD_EVENT_NB:
- /* not yet implemented */
- return &emptyconstraint;
+ return &amd_f15_NBPMC30;
default:
return &emptyconstraint;
}
@@ -635,6 +638,28 @@ static int setup_perfctr_core(void)
return 0;
}
+static int setup_perfctr_nb(void)
+{
+ if (!cpu_has_perfctr_nb)
+ return -ENODEV;
+
+ /* requires core perfctrs initialized first */
+ if (x86_pmu.eventsel != MSR_F15H_PERF_CTL)
+ return -ENODEV;
+
+ if (x86_pmu.get_event_constraints == amd_get_event_constraints) {
+ WARN(1, KERN_ERR "hw perf events nb counter needs constraints handler!");
+ return -ENODEV;
+ }
+
+ x86_pmu.num_counters += AMD64_NUM_COUNTERS_NB;
+ x86_pmu.counters_mask64 |= AMD64_COUNTERS_MASK_NB;
+
+ printk(KERN_INFO "perf: AMD northbridge performance counters detected\n");
+
+ return 0;
+}
+
__init int amd_pmu_init(void)
{
/* Performance-monitoring supported from K7 and later: */
@@ -645,6 +670,7 @@ __init int amd_pmu_init(void)
setup_event_constraints();
setup_perfctr_core();
+ setup_perfctr_nb();
/* Events are common for all AMDs */
memcpy(hw_cache_event_ids, amd_hw_cache_event_ids,
--
1.7.8.4
--
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