[PATCH V3 22/25] perf tools: Output sample flags and insn_len from intel_bts

Adrian Hunter
2015-04-24T19:33:35Z

intel_bts synthesizes samples. Fill in the new flags and
insn_len members with instruction information.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/intel-bts.c | 127 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 123 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index 9b7dfec..4be1844 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -30,6 +30,7 @@
#include "debug.h"
#include "tsc.h"
#include "auxtrace.h"
+#include "intel-pt-decoder/intel-pt-insn-decoder.h"
#include "intel-bts.h"

#define MAX_TIMESTAMP (~0ULL)
@@ -55,6 +56,7 @@ struct intel_bts {
bool cap_user_time_zero;
struct itrace_synth_opts synth_opts;
bool sample_branches;
+ u32 branches_filter;
u64 branches_sample_type;
u64 branches_id;
size_t branches_event_size;
@@ -71,6 +73,8 @@ struct intel_bts_queue {
pid_t tid;
int cpu;
u64 time;
+ struct intel_pt_insn intel_pt_insn;
+ u32 sample_flags;
};

struct branch {
@@ -278,6 +282,8 @@ static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
sample.stream_id = btsq->bts->branches_id;
sample.period = 1;
sample.cpu = btsq->cpu;
+ sample.flags = btsq->sample_flags;
+ sample.insn_len = btsq->intel_pt_insn.length;

if (bts->synth_opts.inject) {
event.sample.header.size = bts->branches_event_size;
@@ -297,11 +303,116 @@ static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
return ret;
}

+static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
+{
+ struct machine *machine = btsq->bts->machine;
+ struct thread *thread;
+ struct addr_location al;
+ unsigned char buf[1024];
+ size_t bufsz;
+ ssize_t len;
+ int x86_64;
+ uint8_t cpumode;
+
+ bufsz = intel_pt_insn_max_size();
+
+ if (machine__kernel_ip(machine, ip))
+ cpumode = PERF_RECORD_MISC_KERNEL;
+ else
+ cpumode = PERF_RECORD_MISC_USER;
+
+ thread = machine__find_thread(machine, -1, btsq->tid);
+ if (!thread)
+ return -1;
+
+ thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al);
+ if (!al.map || !al.map->dso)
+ return -1;
+
+ len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf, bufsz);
+ if (len <= 0)
+ return -1;
+
+ /* Load maps to ensure dso->is_64_bit has been updated */
+ map__load(al.map, machine->symbol_filter);
+
+ x86_64 = al.map->dso->is_64_bit;
+
+ if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
+ return -1;
+
+ return 0;
+}
+
+static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
+ pid_t tid, u64 ip)
+{
+ union perf_event event;
+ const char *msg = "Failed to get instruction";
+ int code = EILSEQ;
+ int err;
+
+ auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
+ code, cpu, pid, tid, ip, msg);
+
+ err = perf_session__deliver_synth_event(bts->session, &event, NULL);
+ if (err)
+ pr_err("Intel BTS: failed to deliver error event, error %d\n",
+ err);
+
+ return err;
+}
+
+static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
+ struct branch *branch)
+{
+ int err;
+
+ if (!branch->from) {
+ if (branch->to)
+ btsq->sample_flags = PERF_IP_FLAG_BRANCH |
+ PERF_IP_FLAG_TRACE_BEGIN;
+ else
+ btsq->sample_flags = 0;
+ btsq->intel_pt_insn.length = 0;
+ } else if (!branch->to) {
+ btsq->sample_flags = PERF_IP_FLAG_BRANCH |
+ PERF_IP_FLAG_TRACE_END;
+ btsq->intel_pt_insn.length = 0;
+ } else {
+ err = intel_bts_get_next_insn(btsq, branch->from);
+ if (err) {
+ btsq->sample_flags = 0;
+ btsq->intel_pt_insn.length = 0;
+ if (!btsq->bts->synth_opts.errors)
+ return 0;
+ err = intel_bts_synth_error(btsq->bts, btsq->cpu,
+ btsq->pid, btsq->tid,
+ branch->from);
+ return err;
+ }
+ btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
+ /* Check for an async branch into the kernel */
+ if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
+ machine__kernel_ip(btsq->bts->machine, branch->to) &&
+ btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
+ PERF_IP_FLAG_CALL |
+ PERF_IP_FLAG_SYSCALLRET))
+ btsq->sample_flags = PERF_IP_FLAG_BRANCH |
+ PERF_IP_FLAG_CALL |
+ PERF_IP_FLAG_ASYNC |
+ PERF_IP_FLAG_INTERRUPT;
+ }
+
+ return 0;
+}
+
static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
struct auxtrace_buffer *buffer)
{
struct branch *branch;
- size_t sz;
+ size_t sz, bsz = sizeof(struct branch);
+ u32 filter = btsq->bts->branches_filter;
int err = 0;

if (buffer->use_data) {
@@ -315,14 +426,15 @@ static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
if (!btsq->bts->sample_branches)
return 0;

- while (sz > sizeof(struct branch)) {
+ for (; sz > bsz; branch += 1, sz -= bsz) {
if (!branch->from && !branch->to)
continue;
+ intel_bts_get_branch_type(btsq, branch);
+ if (filter && !(filter & btsq->sample_flags))
+ continue;
err = intel_bts_synth_branch_sample(btsq, branch);
if (err)
break;
- branch += 1;
- sz -= sizeof(struct branch);
}
return err;
}
@@ -768,6 +880,13 @@ int intel_bts_process_auxtrace_info(union perf_event *event,
else
itrace_synth_opts__set_default(&bts->synth_opts);

+ if (bts->synth_opts.calls)
+ bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
+ PERF_IP_FLAG_TRACE_END;
+ if (bts->synth_opts.returns)
+ bts->branches_filter |= PERF_IP_FLAG_RETURN |
+ PERF_IP_FLAG_TRACE_BEGIN;
+
err = intel_bts_synth_events(bts, session);
if (err)
goto err_free_queues;
--
1.9.1