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-rw-r--r--arch/x86/kernel/cpu/perf_event_amd.c171
1 files changed, 151 insertions, 20 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index 05462f0432d5..dfdab42aed27 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -132,11 +132,14 @@ static u64 amd_pmu_event_map(int hw_event)
return amd_perfmon_event_map[hw_event];
}
+static struct event_constraint *amd_nb_event_constraint;
+
/*
* Previously calculated offsets
*/
static unsigned int event_offsets[X86_PMC_IDX_MAX] __read_mostly;
static unsigned int count_offsets[X86_PMC_IDX_MAX] __read_mostly;
+static unsigned int rdpmc_indexes[X86_PMC_IDX_MAX] __read_mostly;
/*
* Legacy CPUs:
@@ -144,10 +147,14 @@ static unsigned int count_offsets[X86_PMC_IDX_MAX] __read_mostly;
*
* CPUs with core performance counter extensions:
* 6 counters starting at 0xc0010200 each offset by 2
+ *
+ * CPUs with north bridge performance counter extensions:
+ * 4 additional counters starting at 0xc0010240 each offset by 2
+ * (indexed right above either one of the above core counters)
*/
static inline int amd_pmu_addr_offset(int index, bool eventsel)
{
- int offset;
+ int offset, first, base;
if (!index)
return index;
@@ -160,7 +167,23 @@ static inline int amd_pmu_addr_offset(int index, bool eventsel)
if (offset)
return offset;
- if (!cpu_has_perfctr_core)
+ if (amd_nb_event_constraint &&
+ test_bit(index, amd_nb_event_constraint->idxmsk)) {
+ /*
+ * calculate the offset of NB counters with respect to
+ * base eventsel or perfctr
+ */
+
+ first = find_first_bit(amd_nb_event_constraint->idxmsk,
+ X86_PMC_IDX_MAX);
+
+ if (eventsel)
+ base = MSR_F15H_NB_PERF_CTL - x86_pmu.eventsel;
+ else
+ base = MSR_F15H_NB_PERF_CTR - x86_pmu.perfctr;
+
+ offset = base + ((index - first) << 1);
+ } else if (!cpu_has_perfctr_core)
offset = index;
else
offset = index << 1;
@@ -175,24 +198,36 @@ static inline int amd_pmu_addr_offset(int index, bool eventsel)
static inline int amd_pmu_rdpmc_index(int index)
{
- return index;
-}
+ int ret, first;
-static int amd_pmu_hw_config(struct perf_event *event)
-{
- int ret;
+ if (!index)
+ return index;
- /* pass precise event sampling to ibs: */
- if (event->attr.precise_ip && get_ibs_caps())
- return -ENOENT;
+ ret = rdpmc_indexes[index];
- ret = x86_pmu_hw_config(event);
if (ret)
return ret;
- if (has_branch_stack(event))
- return -EOPNOTSUPP;
+ if (amd_nb_event_constraint &&
+ test_bit(index, amd_nb_event_constraint->idxmsk)) {
+ /*
+ * according to the mnual, ECX value of the NB counters is
+ * the index of the NB counter (0, 1, 2 or 3) plus 6
+ */
+
+ first = find_first_bit(amd_nb_event_constraint->idxmsk,
+ X86_PMC_IDX_MAX);
+ ret = index - first + 6;
+ } else
+ ret = index;
+
+ rdpmc_indexes[index] = ret;
+ return ret;
+}
+
+static int amd_core_hw_config(struct perf_event *event)
+{
if (event->attr.exclude_host && event->attr.exclude_guest)
/*
* When HO == GO == 1 the hardware treats that as GO == HO == 0
@@ -206,10 +241,33 @@ static int amd_pmu_hw_config(struct perf_event *event)
else if (event->attr.exclude_guest)
event->hw.config |= AMD64_EVENTSEL_HOSTONLY;
- if (event->attr.type != PERF_TYPE_RAW)
- return 0;
+ return 0;
+}
- event->hw.config |= event->attr.config & AMD64_RAW_EVENT_MASK;
+/*
+ * NB counters do not support the following event select bits:
+ * Host/Guest only
+ * Counter mask
+ * Invert counter mask
+ * Edge detect
+ * OS/User mode
+ */
+static int amd_nb_hw_config(struct perf_event *event)
+{
+ /* for NB, we only allow system wide counting mode */
+ if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
+ return -EINVAL;
+
+ if (event->attr.exclude_user || event->attr.exclude_kernel ||
+ event->attr.exclude_host || event->attr.exclude_guest)
+ return -EINVAL;
+
+ event->hw.config &= ~(ARCH_PERFMON_EVENTSEL_USR |
+ ARCH_PERFMON_EVENTSEL_OS);
+
+ if (event->hw.config & ~(AMD64_RAW_EVENT_MASK_NB |
+ ARCH_PERFMON_EVENTSEL_INT))
+ return -EINVAL;
return 0;
}
@@ -227,6 +285,11 @@ static inline int amd_is_nb_event(struct hw_perf_event *hwc)
return (hwc->config & 0xe0) == 0xe0;
}
+static inline int amd_is_perfctr_nb_event(struct hw_perf_event *hwc)
+{
+ return amd_nb_event_constraint && amd_is_nb_event(hwc);
+}
+
static inline int amd_has_nb(struct cpu_hw_events *cpuc)
{
struct amd_nb *nb = cpuc->amd_nb;
@@ -234,6 +297,30 @@ static inline int amd_has_nb(struct cpu_hw_events *cpuc)
return nb && nb->nb_id != -1;
}
+static int amd_pmu_hw_config(struct perf_event *event)
+{
+ int ret;
+
+ /* pass precise event sampling to ibs: */
+ if (event->attr.precise_ip && get_ibs_caps())
+ return -ENOENT;
+
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
+ ret = x86_pmu_hw_config(event);
+ if (ret)
+ return ret;
+
+ if (event->attr.type == PERF_TYPE_RAW)
+ event->hw.config |= event->attr.config & AMD64_RAW_EVENT_MASK;
+
+ if (amd_is_perfctr_nb_event(&event->hw))
+ return amd_nb_hw_config(event);
+
+ return amd_core_hw_config(event);
+}
+
static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc,
struct perf_event *event)
{
@@ -254,6 +341,19 @@ static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc,
}
}
+static void amd_nb_interrupt_hw_config(struct hw_perf_event *hwc)
+{
+ int core_id = cpu_data(smp_processor_id()).cpu_core_id;
+
+ /* deliver interrupts only to this core */
+ if (hwc->config & ARCH_PERFMON_EVENTSEL_INT) {
+ hwc->config |= AMD64_EVENTSEL_INT_CORE_ENABLE;
+ hwc->config &= ~AMD64_EVENTSEL_INT_CORE_SEL_MASK;
+ hwc->config |= (u64)(core_id) <<
+ AMD64_EVENTSEL_INT_CORE_SEL_SHIFT;
+ }
+}
+
/*
* AMD64 NorthBridge events need special treatment because
* counter access needs to be synchronized across all cores
@@ -299,6 +399,12 @@ __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *ev
struct perf_event *old;
int idx, new = -1;
+ if (!c)
+ c = &unconstrained;
+
+ if (cpuc->is_fake)
+ return c;
+
/*
* detect if already present, if so reuse
*
@@ -335,6 +441,9 @@ __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *ev
if (new == -1)
return &emptyconstraint;
+ if (amd_is_perfctr_nb_event(hwc))
+ amd_nb_interrupt_hw_config(hwc);
+
return &nb->event_constraints[new];
}
@@ -434,7 +543,8 @@ amd_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event)
if (!(amd_has_nb(cpuc) && amd_is_nb_event(&event->hw)))
return &unconstrained;
- return __amd_get_nb_event_constraints(cpuc, event, &unconstrained);
+ return __amd_get_nb_event_constraints(cpuc, event,
+ amd_nb_event_constraint);
}
static void amd_put_event_constraints(struct cpu_hw_events *cpuc,
@@ -533,6 +643,9 @@ static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09,
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_NBPMC96 = EVENT_CONSTRAINT(0, 0x3C0, 0);
+static struct event_constraint amd_NBPMC74 = EVENT_CONSTRAINT(0, 0xF0, 0);
+
static struct event_constraint *
amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, struct perf_event *event)
{
@@ -598,8 +711,8 @@ amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, struct perf_event *ev
return &amd_f15_PMC20;
}
case AMD_EVENT_NB:
- /* not yet implemented */
- return &emptyconstraint;
+ return __amd_get_nb_event_constraints(cpuc, event,
+ amd_nb_event_constraint);
default:
return &emptyconstraint;
}
@@ -647,7 +760,7 @@ static __initconst const struct x86_pmu amd_pmu = {
static int setup_event_constraints(void)
{
- if (boot_cpu_data.x86 >= 0x15)
+ if (boot_cpu_data.x86 == 0x15)
x86_pmu.get_event_constraints = amd_get_event_constraints_f15h;
return 0;
}
@@ -677,6 +790,23 @@ static int setup_perfctr_core(void)
return 0;
}
+static int setup_perfctr_nb(void)
+{
+ if (!cpu_has_perfctr_nb)
+ return -ENODEV;
+
+ x86_pmu.num_counters += AMD64_NUM_COUNTERS_NB;
+
+ if (cpu_has_perfctr_core)
+ amd_nb_event_constraint = &amd_NBPMC96;
+ else
+ amd_nb_event_constraint = &amd_NBPMC74;
+
+ 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: */
@@ -687,6 +817,7 @@ __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,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 09:38:24 +0000