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Subject[PATCH 2/2 -tip] perf_counter: Add generalized hardware interrupt support for AMD and Intel Corei7/Nehalem, Core2 and Atom
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$ ./perf stat -e interrupts -e masked -e int-pending-mask-cycles -- ls -lR /usr/include/ > /dev/null
Performance counter stats for 'ls -lR /usr/include/':

377 interrupts
53429936 int-mask-cycles
1119 int-pending-mask-cycles

0.371457539 seconds time elapsed

$ ./perf list shows interrupt events like :

interrupts OR interrupt [Hardware interrupt event]
int-mask-cycles OR masked [Hardware interrupt event]
int-pending-mask-cycles [Hardware interrupt event]

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
---
arch/x86/kernel/cpu/perf_counter.c | 50 +++++++++++++++++++++++++++++++++++
include/linux/perf_counter.h | 12 ++++++++
kernel/perf_counter.c | 1 +
tools/perf/util/parse-events.c | 51 ++++++++++++++++++++++++++++++++++++
4 files changed, 114 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 48f28b7..43b24ad 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -388,6 +388,26 @@ static const u64 nehalem_hw_vector_event_ids[] =
[PERF_COUNT_HW_VECTOR_OPS] = 0x0710, /* FP_COMP_OPS_EXE.X87|MMX|SSE_FP*/
};

+/*
+ * Generalized hw interrupt event table
+ */
+
+static u64 __read_mostly hw_interrupt_event_ids[PERF_COUNT_HW_INTERRUPT_MAX];
+
+static const u64 nehalem_hw_interrupt_event_ids[] =
+{
+ [PERF_COUNT_HW_INTERRUPT] = 0x011D, /* HW_INT.RCV */
+ [PERF_COUNT_HW_INTERRUPT_MASK] = 0x021D, /* HW_INT.CYCLES_MASKED */
+ [PERF_COUNT_HW_INTERRUPT_PENDING_MASK]= 0x041D, /* HW_INT.CYCLES_PENDING_AND_MASKED*/
+};
+
+static const u64 core2_atom_hw_interrupt_event_ids[] =
+{
+ [PERF_COUNT_HW_INTERRUPT] = 0x00C8, /* HW_INT_RCV */
+ [PERF_COUNT_HW_INTERRUPT_MASK] = 0x01C6, /* CYCLES_INT_MASKED.CYCLES_INT_MASKED*/
+ [PERF_COUNT_HW_INTERRUPT_PENDING_MASK]= 0x02C6, /* CYCLES_INT_MASKED.CYCLES_INT_PENDING_AND_MASKED*/
+};
+
static u64 intel_pmu_raw_event(u64 event)
{
#define CORE_EVNTSEL_EVENT_MASK 0x000000FFULL
@@ -508,6 +528,14 @@ static const u64 amd_hw_vector_event_ids[] =
|SSE & SSE2) Instructions */
};

+
+static const u64 amd_hw_interrupt_event_ids[] =
+{
+ [PERF_COUNT_HW_INTERRUPT] = 0x00CF, /* Interrupts Taken */
+ [PERF_COUNT_HW_INTERRUPT_MASK] = 0x00CD, /* Interrupts-Masked Cycles*/
+ [PERF_COUNT_HW_INTERRUPT_PENDING_MASK]= 0x00CE, /* Int Mask+Pending Cycles */
+};
+
/*
* AMD Performance Monitor K7 and later.
*/
@@ -697,6 +725,17 @@ set_hw_vector_attr(struct hw_perf_counter *hwc, struct perf_counter_attr *attr)
return 0;
}

+static inline int
+set_hw_interrupt_attr(struct hw_perf_counter *hwc, struct perf_counter_attr *attr)
+{
+ if (attr->config >= PERF_COUNT_HW_INTERRUPT_MAX)
+ return -EINVAL;
+
+ hwc->config |= hw_interrupt_event_ids[attr->config];
+
+ return 0;
+}
+
/*
* Setup the hardware configuration for a given attr_type
*/
@@ -757,6 +796,9 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
if (attr->type == PERF_TYPE_HW_VECTOR)
return set_hw_vector_attr(hwc, attr);

+ if (attr->type == PERF_TYPE_HW_INTERRUPT)
+ return set_hw_interrupt_attr(hwc, attr);
+
if (attr->config >= x86_pmu.max_events)
return -EINVAL;
/*
@@ -1478,6 +1520,8 @@ static int intel_pmu_init(void)
case 29: /* six-core 45 nm xeon "Dunnington" */
memcpy(hw_cache_event_ids, core2_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
+ memcpy(hw_interrupt_event_ids, core2_atom_hw_interrupt_event_ids,
+ sizeof(hw_interrupt_event_ids));

pr_cont("Core2 events, ");
break;
@@ -1487,12 +1531,16 @@ static int intel_pmu_init(void)
sizeof(hw_cache_event_ids));
memcpy(hw_vector_event_ids, nehalem_hw_vector_event_ids,
sizeof(hw_vector_event_ids));
+ memcpy(hw_interrupt_event_ids, nehalem_hw_interrupt_event_ids,
+ sizeof(hw_interrupt_event_ids));

pr_cont("Nehalem/Corei7 events, ");
break;
case 28:
memcpy(hw_cache_event_ids, atom_hw_cache_event_ids,
sizeof(hw_cache_event_ids));
+ memcpy(hw_interrupt_event_ids, core2_atom_hw_interrupt_event_ids,
+ sizeof(hw_interrupt_event_ids));

pr_cont("Atom events, ");
break;
@@ -1513,6 +1561,8 @@ static int amd_pmu_init(void)
sizeof(hw_cache_event_ids));
memcpy(hw_vector_event_ids, amd_hw_vector_event_ids,
sizeof(hw_vector_event_ids));
+ memcpy(hw_interrupt_event_ids, amd_hw_interrupt_event_ids,
+ sizeof(hw_interrupt_event_ids));

return 0;
}
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e91b712..a53081b 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -32,6 +32,7 @@ enum perf_type_id {
PERF_TYPE_HW_CACHE = 3,
PERF_TYPE_RAW = 4,
PERF_TYPE_HW_VECTOR = 5,
+ PERF_TYPE_HW_INTERRUPT = 6,

PERF_TYPE_MAX, /* non-ABI */
};
@@ -104,6 +105,17 @@ enum perf_hw_vector_id {
};

/*
+ * Generalized hardware interrupt counters:
+ */
+enum perf_hw_interrupt_id {
+ PERF_COUNT_HW_INTERRUPT = 0,
+ PERF_COUNT_HW_INTERRUPT_MASK = 1,
+ PERF_COUNT_HW_INTERRUPT_PENDING_MASK = 2,
+
+ PERF_COUNT_HW_INTERRUPT_MAX, /* non-ABI */
+};
+
+/*
* Special "software" counters provided by the kernel, even if the hardware
* does not support performance counters. These counters measure various
* physical and sw events of the kernel (and allow the profiling of them as
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index dd3848a..7a529a8 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -3839,6 +3839,7 @@ perf_counter_alloc(struct perf_counter_attr *attr,
case PERF_TYPE_HARDWARE:
case PERF_TYPE_HW_CACHE:
case PERF_TYPE_HW_VECTOR:
+ case PERF_TYPE_HW_INTERRUPT:
pmu = hw_perf_counter_init(counter);
break;

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 8213dfb..d085b8f 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -51,6 +51,14 @@ static struct event_symbol vector_event_symbols[] = {
{ CHVECTOR(OPS), "vec-ops", "vec-operations"},
};

+#define CHINT(x) .type = PERF_TYPE_HW_INTERRUPT, .config = PERF_COUNT_HW_##x
+
+static struct event_symbol interrupt_event_symbols[] = {
+ { CHINT(INTERRUPT), "interrupts", "interrupt" },
+ { CHINT(INTERRUPT_MASK), "int-mask-cycles", "masked" },
+ { CHINT(INTERRUPT_PENDING_MASK),"int-pending-mask-cycles", "" },
+};
+
#define __PERF_COUNTER_FIELD(config, name) \
((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)

@@ -188,6 +196,11 @@ char *event_name(int counter)
return vector_event_symbols[config].symbol;
return "unknown-vector";

+ case PERF_TYPE_HW_INTERRUPT:
+ if (config < PERF_COUNT_HW_INTERRUPT_MAX)
+ return interrupt_event_symbols[config].symbol;
+ return "unknown-interrupt";
+
case PERF_TYPE_SOFTWARE:
if (config < PERF_COUNT_SW_MAX)
return sw_event_names[config];
@@ -311,6 +324,21 @@ static int check_vector_events(const char *str, unsigned int i)
return 0;
}

+static int check_interrupt_events(const char *str, unsigned int i)
+{
+ int n;
+
+ n = strlen(interrupt_event_symbols[i].symbol);
+ if (!strncmp(str, interrupt_event_symbols[i].symbol, n))
+ return n;
+
+ n = strlen(interrupt_event_symbols[i].alias);
+ if (n)
+ if (!strncmp(str, interrupt_event_symbols[i].alias, n))
+ return n;
+ return 0;
+}
+
static int
parse_symbolic_event(const char **strp, struct perf_counter_attr *attr)
{
@@ -338,6 +366,16 @@ parse_symbolic_event(const char **strp, struct perf_counter_attr *attr)
}
}

+ for (i = 0; i < ARRAY_SIZE(interrupt_event_symbols); i++) {
+ n = check_interrupt_events(str, i);
+ if (n > 0) {
+ attr->type = interrupt_event_symbols[i].type;
+ attr->config = interrupt_event_symbols[i].config;
+ *strp = str + n;
+ return 1;
+ }
+ }
+
return 0;
}

@@ -463,6 +501,7 @@ static const char * const event_type_descriptors[] = {
"Tracepoint event",
"Hardware cache event",
"Hardware vector event",
+ "Hardware interrupt event",
};

/*
@@ -523,6 +562,18 @@ void print_events(void)
}

fprintf(stderr, "\n");
+ syms = interrupt_event_symbols;
+ type = syms->type;
+ for (i = 0; i < ARRAY_SIZE(interrupt_event_symbols); i++, syms++) {
+ if (strlen(syms->alias))
+ sprintf(name, "%s OR %s", syms->symbol, syms->alias);
+ else
+ strcpy(name, syms->symbol);
+ fprintf(stderr, " %-40s [%s]\n", name,
+ event_type_descriptors[type]);
+ }
+
+ fprintf(stderr, "\n");
fprintf(stderr, " %-40s [raw hardware event descriptor]\n",
"rNNN");
fprintf(stderr, "\n");
--
1.6.0.6




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