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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@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: cebbert.lkml@gmail.com
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Waiman Long <Waiman.Long@hp.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1411559322-16548-4-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Stephane Eranian 2014-09-24 13:48:39 +02:00 committed by Ingo Molnar
parent aea48559ac
commit 6a21c0b5c2
5 changed files with 87 additions and 6 deletions
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1
tools/perf/perf.h
View File

@ -52,6 +52,7 @@ 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;

1
tools/perf/util/event.h
View File

@ -188,6 +188,7 @@ 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;
};

46
tools/perf/util/evsel.c
View File

@ -661,6 +661,11 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
if (callchain_param.enabled && !evsel->no_aux_samples)
perf_evsel__config_callgraph(evsel);
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);
@ -1037,6 +1042,7 @@ 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);
@ -1536,6 +1542,23 @@ 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;
}
@ -1631,6 +1654,16 @@ size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
if (type & PERF_SAMPLE_TRANSACTION)
result += sizeof(u64);
if (type & PERF_SAMPLE_REGS_INTR) {
if (sample->intr_regs.abi) {
result += sizeof(u64);
sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
result += sz;
} else {
result += sizeof(u64);
}
}
return result;
}
@ -1809,6 +1842,17 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type,
array++;
}
if (type & PERF_SAMPLE_REGS_INTR) {
if (sample->intr_regs.abi) {
*array++ = sample->intr_regs.abi;
sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
memcpy(array, sample->intr_regs.regs, sz);
array = (void *)array + sz;
} else {
*array++ = 0;
}
}
return 0;
}
@ -1938,7 +1982,7 @@ 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

1
tools/perf/util/header.c
View File

@ -2143,6 +2143,7 @@ static const int attr_file_abi_sizes[] = {
[1] = PERF_ATTR_SIZE_VER1,
[2] = PERF_ATTR_SIZE_VER2,
[3] = PERF_ATTR_SIZE_VER3,
[4] = PERF_ATTR_SIZE_VER4,
0,
};

44
tools/perf/util/session.c
View File

@ -592,15 +592,46 @@ static void regs_dump__printf(u64 mask, u64 *regs)
}
}
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 "unknown";
return regs_abi[d->abi];
}
static void regs__printf(const char *type, struct regs_dump *regs)
{
u64 mask = regs->mask;
printf("... %s regs: mask 0x%" PRIx64 " ABI %s\n",
type,
mask,
regs_dump_abi(regs));
regs_dump__printf(mask, regs->regs);
}
static void regs_user__printf(struct perf_sample *sample)
{
struct regs_dump *user_regs = &sample->user_regs;
if (user_regs->regs) {
u64 mask = user_regs->mask;
printf("... user regs: mask 0x%" PRIx64 "\n", mask);
regs_dump__printf(mask, user_regs->regs);
}
if (user_regs->regs)
regs__printf("user", user_regs);
}
static void regs_intr__printf(struct perf_sample *sample)
{
struct regs_dump *intr_regs = &sample->intr_regs;
if (intr_regs->regs)
regs__printf("intr", intr_regs);
}
static void stack_user__printf(struct stack_dump *dump)
@ -699,6 +730,9 @@ 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);
if (sample_type & PERF_SAMPLE_STACK_USER)
stack_user__printf(&sample->user_stack);