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Date: Wed, 9 Jul 2014 00:15:58 +0200
From: Stephane Eranian <eranian@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
jolsa@...hat.com, acme@...hat.com, namhyung@...nel.org
Subject: [PATCH 3/4] perf tools: add core support for sampling intr machine state regs
Add the infrastructure to setup, collect and report the interrupt
machine state regs which can be captured by the kernel.
Signed-off-by: Stephane Eranian <eranian@...gle.com>
---
tools/perf/perf.h | 1 +
tools/perf/util/event.h | 7 +++++++
tools/perf/util/evsel.c | 25 ++++++++++++++++++++++++-
tools/perf/util/session.c | 26 ++++++++++++++++++++++++++
4 files changed, 58 insertions(+), 1 deletion(-)
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 510c65f..309d956 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -54,6 +54,7 @@ struct record_opts {
bool sample_weight;
bool sample_time;
bool period;
+ bool sample_intr_regs;
unsigned int freq;
unsigned int mmap_pages;
unsigned int user_freq;
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index e5dd40a..4ce2e99 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -160,6 +160,7 @@ struct perf_sample {
struct ip_callchain *callchain;
struct branch_stack *branch_stack;
struct regs_dump user_regs;
+ struct regs_dump intr_regs;
struct stack_dump user_stack;
struct sample_read read;
};
@@ -290,6 +291,12 @@ int perf_event__preprocess_sample(const union perf_event *event,
const char *perf_event__name(unsigned int id);
+int perf_event__parse_sample(const union perf_event *event, u64 type,
+ int sample_size, bool sample_id_all,
+ u64 sample_regs_user, u64 sample_stack_user,
+ u64 sample_regs_intr,
+ struct perf_sample *data, bool swapped);
+
size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
u64 read_format);
int perf_event__synthesize_sample(union perf_event *event, u64 type,
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8606175..00e45d1 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -626,6 +626,11 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
if (opts->call_graph_enabled)
perf_evsel__config_callgraph(evsel, opts);
+ if (opts->sample_intr_regs) {
+ attr->sample_regs_intr = PERF_REGS_MASK;
+ perf_evsel__set_sample_bit(evsel, REGS_INTR);
+ }
+
if (target__has_cpu(&opts->target))
perf_evsel__set_sample_bit(evsel, CPU);
@@ -979,6 +984,7 @@ static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
ret += PRINT_ATTR_X64(branch_sample_type);
ret += PRINT_ATTR_X64(sample_regs_user);
ret += PRINT_ATTR_U32(sample_stack_user);
+ ret += PRINT_ATTR_X64(sample_regs_intr);
ret += fprintf(fp, "%.60s\n", graph_dotted_line);
@@ -1468,6 +1474,23 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
array++;
}
+ data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
+ if (type & PERF_SAMPLE_REGS_INTR) {
+ OVERFLOW_CHECK_u64(array);
+ data->intr_regs.abi = *array;
+ array++;
+
+ if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
+ u64 mask = evsel->attr.sample_regs_intr;
+
+ sz = hweight_long(mask) * sizeof(u64);
+ OVERFLOW_CHECK(array, sz, max_size);
+ data->intr_regs.mask = mask;
+ data->intr_regs.regs = (u64 *)array;
+ array = (void *)array + sz;
+ }
+ }
+
return 0;
}
@@ -1870,7 +1893,7 @@ static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
- bit_name(IDENTIFIER),
+ bit_name(IDENTIFIER), bit_name(REGS_INTR),
{ .name = NULL, }
};
#undef bit_name
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 64a186e..6f112ca 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -713,6 +713,29 @@ static void regs_user__printf(struct perf_sample *sample)
}
}
+static const char *regs_abi[]= {
+ [PERF_SAMPLE_REGS_ABI_NONE] = "none",
+ [PERF_SAMPLE_REGS_ABI_32] = "32-bit",
+ [PERF_SAMPLE_REGS_ABI_64] = "64-bit",
+};
+
+static inline const char *regs_dump_abi(struct regs_dump *d)
+{
+ if (d->abi > PERF_SAMPLE_REGS_ABI_64)
+ return "???";
+ return regs_abi[d->abi];
+}
+
+static void regs_intr__printf(struct perf_sample *sample, u64 mask)
+{
+ struct regs_dump *intr_regs = &sample->intr_regs;
+
+ if (intr_regs->regs) {
+ printf("... intr regs: mask 0x%" PRIx64 " ABI: %s\n", mask, regs_dump_abi(intr_regs));
+ regs_dump__printf(mask, intr_regs->regs);
+ }
+}
+
static void stack_user__printf(struct stack_dump *dump)
{
printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
@@ -809,6 +832,9 @@ static void dump_sample(struct perf_evsel *evsel, union perf_event *event,
if (sample_type & PERF_SAMPLE_REGS_USER)
regs_user__printf(sample);
+ if (sample_type & PERF_SAMPLE_REGS_INTR)
+ regs_intr__printf(sample, evsel->attr.sample_regs_intr);
+
if (sample_type & PERF_SAMPLE_STACK_USER)
stack_user__printf(&sample->user_stack);
--
1.8.3.2
--
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