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linux-pinenote/arch/x86/kernel/cpu/perf_event_knc.c
Vince Weaver e4074b3049 perf/x86: Enable overflow on Intel KNC with a custom knc_pmu_handle_irq() 
Although based on the Intel P6 design, the interrupt mechnanism
for KNC more closely resembles the Intel architectural
perfmon one.

We can't just re-use that code though, because KNC has different
MSR numbers for the status and ack registers.

In this case we just cut-and paste from perf_event_intel.c
with some minor changes, as it looks like it would not be
worth the trouble to change that code to be MSR-configurable.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: eranian@gmail.com
Cc: Meadows Lawrence F <lawrence.f.meadows@intel.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1210171304410.23243@vincent-weaver-1.um.maine.edu
[ Small stylistic edits. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-10-24 12:00:49 +02:00

319 lines
8.1 KiB
C
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/* Driver for Intel Xeon Phi "Knights Corner" PMU */
#include <linux/perf_event.h>
#include <linux/types.h>
#include <asm/hardirq.h>
#include "perf_event.h"
static const u64 knc_perfmon_event_map[] =
{
[PERF_COUNT_HW_CPU_CYCLES] = 0x002a,
[PERF_COUNT_HW_INSTRUCTIONS] = 0x0016,
[PERF_COUNT_HW_CACHE_REFERENCES] = 0x0028,
[PERF_COUNT_HW_CACHE_MISSES] = 0x0029,
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0012,
[PERF_COUNT_HW_BRANCH_MISSES] = 0x002b,
};
static __initconst u64 knc_hw_cache_event_ids
[PERF_COUNT_HW_CACHE_MAX]
[PERF_COUNT_HW_CACHE_OP_MAX]
[PERF_COUNT_HW_CACHE_RESULT_MAX] =
{
[ C(L1D) ] = {
[ C(OP_READ) ] = {
/* On Xeon Phi event "0" is a valid DATA_READ */
/* (L1 Data Cache Reads) Instruction. */
/* We code this as ARCH_PERFMON_EVENTSEL_INT as this */
/* bit will always be set in x86_pmu_hw_config(). */
[ C(RESULT_ACCESS) ] = ARCH_PERFMON_EVENTSEL_INT,
/* DATA_READ */
[ C(RESULT_MISS) ] = 0x0003, /* DATA_READ_MISS */
},
[ C(OP_WRITE) ] = {
[ C(RESULT_ACCESS) ] = 0x0001, /* DATA_WRITE */
[ C(RESULT_MISS) ] = 0x0004, /* DATA_WRITE_MISS */
},
[ C(OP_PREFETCH) ] = {
[ C(RESULT_ACCESS) ] = 0x0011, /* L1_DATA_PF1 */
[ C(RESULT_MISS) ] = 0x001c, /* L1_DATA_PF1_MISS */
},
},
[ C(L1I ) ] = {
[ C(OP_READ) ] = {
[ C(RESULT_ACCESS) ] = 0x000c, /* CODE_READ */
[ C(RESULT_MISS) ] = 0x000e, /* CODE_CACHE_MISS */
},
[ C(OP_WRITE) ] = {
[ C(RESULT_ACCESS) ] = -1,
[ C(RESULT_MISS) ] = -1,
},
[ C(OP_PREFETCH) ] = {
[ C(RESULT_ACCESS) ] = 0x0,
[ C(RESULT_MISS) ] = 0x0,
},
},
[ C(LL ) ] = {
[ C(OP_READ) ] = {
[ C(RESULT_ACCESS) ] = 0,
[ C(RESULT_MISS) ] = 0x10cb, /* L2_READ_MISS */
},
[ C(OP_WRITE) ] = {
[ C(RESULT_ACCESS) ] = 0x10cc, /* L2_WRITE_HIT */
[ C(RESULT_MISS) ] = 0,
},
[ C(OP_PREFETCH) ] = {
[ C(RESULT_ACCESS) ] = 0x10fc, /* L2_DATA_PF2 */
[ C(RESULT_MISS) ] = 0x10fe, /* L2_DATA_PF2_MISS */
},
},
[ C(DTLB) ] = {
[ C(OP_READ) ] = {
[ C(RESULT_ACCESS) ] = ARCH_PERFMON_EVENTSEL_INT,
/* DATA_READ */
/* see note on L1 OP_READ */
[ C(RESULT_MISS) ] = 0x0002, /* DATA_PAGE_WALK */
},
[ C(OP_WRITE) ] = {
[ C(RESULT_ACCESS) ] = 0x0001, /* DATA_WRITE */
[ C(RESULT_MISS) ] = 0x0002, /* DATA_PAGE_WALK */
},
[ C(OP_PREFETCH) ] = {
[ C(RESULT_ACCESS) ] = 0x0,
[ C(RESULT_MISS) ] = 0x0,
},
},
[ C(ITLB) ] = {
[ C(OP_READ) ] = {
[ C(RESULT_ACCESS) ] = 0x000c, /* CODE_READ */
[ C(RESULT_MISS) ] = 0x000d, /* CODE_PAGE_WALK */
},
[ C(OP_WRITE) ] = {
[ C(RESULT_ACCESS) ] = -1,
[ C(RESULT_MISS) ] = -1,
},
[ C(OP_PREFETCH) ] = {
[ C(RESULT_ACCESS) ] = -1,
[ C(RESULT_MISS) ] = -1,
},
},
[ C(BPU ) ] = {
[ C(OP_READ) ] = {
[ C(RESULT_ACCESS) ] = 0x0012, /* BRANCHES */
[ C(RESULT_MISS) ] = 0x002b, /* BRANCHES_MISPREDICTED */
},
[ C(OP_WRITE) ] = {
[ C(RESULT_ACCESS) ] = -1,
[ C(RESULT_MISS) ] = -1,
},
[ C(OP_PREFETCH) ] = {
[ C(RESULT_ACCESS) ] = -1,
[ C(RESULT_MISS) ] = -1,
},
},
};
static u64 knc_pmu_event_map(int hw_event)
{
return knc_perfmon_event_map[hw_event];
}
static struct event_constraint knc_event_constraints[] =
{
INTEL_EVENT_CONSTRAINT(0xc3, 0x1), /* HWP_L2HIT */
INTEL_EVENT_CONSTRAINT(0xc4, 0x1), /* HWP_L2MISS */
INTEL_EVENT_CONSTRAINT(0xc8, 0x1), /* L2_READ_HIT_E */
INTEL_EVENT_CONSTRAINT(0xc9, 0x1), /* L2_READ_HIT_M */
INTEL_EVENT_CONSTRAINT(0xca, 0x1), /* L2_READ_HIT_S */
INTEL_EVENT_CONSTRAINT(0xcb, 0x1), /* L2_READ_MISS */
INTEL_EVENT_CONSTRAINT(0xcc, 0x1), /* L2_WRITE_HIT */
INTEL_EVENT_CONSTRAINT(0xce, 0x1), /* L2_STRONGLY_ORDERED_STREAMING_VSTORES_MISS */
INTEL_EVENT_CONSTRAINT(0xcf, 0x1), /* L2_WEAKLY_ORDERED_STREAMING_VSTORE_MISS */
INTEL_EVENT_CONSTRAINT(0xd7, 0x1), /* L2_VICTIM_REQ_WITH_DATA */
INTEL_EVENT_CONSTRAINT(0xe3, 0x1), /* SNP_HITM_BUNIT */
INTEL_EVENT_CONSTRAINT(0xe6, 0x1), /* SNP_HIT_L2 */
INTEL_EVENT_CONSTRAINT(0xe7, 0x1), /* SNP_HITM_L2 */
INTEL_EVENT_CONSTRAINT(0xf1, 0x1), /* L2_DATA_READ_MISS_CACHE_FILL */
INTEL_EVENT_CONSTRAINT(0xf2, 0x1), /* L2_DATA_WRITE_MISS_CACHE_FILL */
INTEL_EVENT_CONSTRAINT(0xf6, 0x1), /* L2_DATA_READ_MISS_MEM_FILL */
INTEL_EVENT_CONSTRAINT(0xf7, 0x1), /* L2_DATA_WRITE_MISS_MEM_FILL */
INTEL_EVENT_CONSTRAINT(0xfc, 0x1), /* L2_DATA_PF2 */
INTEL_EVENT_CONSTRAINT(0xfd, 0x1), /* L2_DATA_PF2_DROP */
INTEL_EVENT_CONSTRAINT(0xfe, 0x1), /* L2_DATA_PF2_MISS */
INTEL_EVENT_CONSTRAINT(0xff, 0x1), /* L2_DATA_HIT_INFLIGHT_PF2 */
EVENT_CONSTRAINT_END
};
#define MSR_KNC_IA32_PERF_GLOBAL_STATUS 0x0000002d
#define MSR_KNC_IA32_PERF_GLOBAL_OVF_CONTROL 0x0000002e
#define MSR_KNC_IA32_PERF_GLOBAL_CTRL 0x0000002f
#define KNC_ENABLE_COUNTER0 0x00000001
#define KNC_ENABLE_COUNTER1 0x00000002
static void knc_pmu_disable_all(void)
{
u64 val;
rdmsrl(MSR_KNC_IA32_PERF_GLOBAL_CTRL, val);
val &= ~(KNC_ENABLE_COUNTER0|KNC_ENABLE_COUNTER1);
wrmsrl(MSR_KNC_IA32_PERF_GLOBAL_CTRL, val);
}
static void knc_pmu_enable_all(int added)
{
u64 val;
rdmsrl(MSR_KNC_IA32_PERF_GLOBAL_CTRL, val);
val |= (KNC_ENABLE_COUNTER0|KNC_ENABLE_COUNTER1);
wrmsrl(MSR_KNC_IA32_PERF_GLOBAL_CTRL, val);
}
static inline void
knc_pmu_disable_event(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
u64 val;
val = hwc->config;
val &= ~ARCH_PERFMON_EVENTSEL_ENABLE;
(void)wrmsrl_safe(hwc->config_base + hwc->idx, val);
}
static void knc_pmu_enable_event(struct perf_event *event)
{
struct hw_perf_event *hwc = &event->hw;
u64 val;
val = hwc->config;
val |= ARCH_PERFMON_EVENTSEL_ENABLE;
(void)wrmsrl_safe(hwc->config_base + hwc->idx, val);
}
static inline u64 knc_pmu_get_status(void)
{
u64 status;
rdmsrl(MSR_KNC_IA32_PERF_GLOBAL_STATUS, status);
return status;
}
static inline void knc_pmu_ack_status(u64 ack)
{
wrmsrl(MSR_KNC_IA32_PERF_GLOBAL_OVF_CONTROL, ack);
}
static int knc_pmu_handle_irq(struct pt_regs *regs)
{
struct perf_sample_data data;
struct cpu_hw_events *cpuc;
int handled = 0;
int bit, loops;
u64 status;
cpuc = &__get_cpu_var(cpu_hw_events);
knc_pmu_disable_all();
status = knc_pmu_get_status();
if (!status) {
knc_pmu_enable_all(0);
return handled;
}
loops = 0;
again:
knc_pmu_ack_status(status);
if (++loops > 100) {
WARN_ONCE(1, "perf: irq loop stuck!\n");
perf_event_print_debug();
goto done;
}
inc_irq_stat(apic_perf_irqs);
for_each_set_bit(bit, (unsigned long *)&status, X86_PMC_IDX_MAX) {
struct perf_event *event = cpuc->events[bit];
handled++;
if (!test_bit(bit, cpuc->active_mask))
continue;
if (!intel_pmu_save_and_restart(event))
continue;
perf_sample_data_init(&data, 0, event->hw.last_period);
if (perf_event_overflow(event, &data, regs))
x86_pmu_stop(event, 0);
}
/*
* Repeat if there is more work to be done:
*/
status = knc_pmu_get_status();
if (status)
goto again;
done:
knc_pmu_enable_all(0);
return handled;
}
PMU_FORMAT_ATTR(event, "config:0-7" );
PMU_FORMAT_ATTR(umask, "config:8-15" );
PMU_FORMAT_ATTR(edge, "config:18" );
PMU_FORMAT_ATTR(inv, "config:23" );
PMU_FORMAT_ATTR(cmask, "config:24-31" );
static struct attribute *intel_knc_formats_attr[] = {
&format_attr_event.attr,
&format_attr_umask.attr,
&format_attr_edge.attr,
&format_attr_inv.attr,
&format_attr_cmask.attr,
NULL,
};
static __initconst struct x86_pmu knc_pmu = {
.name = "knc",
.handle_irq = knc_pmu_handle_irq,
.disable_all = knc_pmu_disable_all,
.enable_all = knc_pmu_enable_all,
.enable = knc_pmu_enable_event,
.disable = knc_pmu_disable_event,
.hw_config = x86_pmu_hw_config,
.schedule_events = x86_schedule_events,
.eventsel = MSR_KNC_EVNTSEL0,
.perfctr = MSR_KNC_PERFCTR0,
.event_map = knc_pmu_event_map,
.max_events = ARRAY_SIZE(knc_perfmon_event_map),
.apic = 1,
.max_period = (1ULL << 39) - 1,
.version = 0,
.num_counters = 2,
.cntval_bits = 40,
.cntval_mask = (1ULL << 40) - 1,
.get_event_constraints = x86_get_event_constraints,
.event_constraints = knc_event_constraints,
.format_attrs = intel_knc_formats_attr,
};
__init int knc_pmu_init(void)
{
x86_pmu = knc_pmu;
memcpy(hw_cache_event_ids, knc_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
return 0;
}
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