[PATCH 0/5] perf intel-pt: A few fixes

[PATCH 0/5] perf intel-pt: A few fixes

[Adrian Hunter]

Hi

Here are some fixes and a minor improvement for Intel PT.  The first 3
patches are cc stable, but the last 2 are not.


Adrian Hunter (5):
      perf auxtrace: Define auxtrace record alignment
      perf intel-pt: Fix overlap calculation for padding
      perf intel-pt: Fix CYC timestamp calculation after OVF
      perf intel-pt: Packet splitting can happen only on 32-bit
      perf auxtrace: Add timestamp to auxtrace errors

 tools/perf/util/auxtrace.c                         | 26 ++++++++++++---
 tools/perf/util/auxtrace.h                         |  5 ++-
 tools/perf/util/event.h                            |  3 +-
 tools/perf/util/intel-bts.c                        |  4 +--
 .../perf/util/intel-pt-decoder/intel-pt-decoder.c  | 39 +++++++++++++++++++---
 tools/perf/util/intel-pt.c                         | 23 +++++++++----
 tools/perf/util/s390-cpumsf.c                      |  7 ++--
 tools/perf/util/session.c                          |  3 ++
 8 files changed, 88 insertions(+), 22 deletions(-)


Regards
Adrian

[PATCH 1/5] perf auxtrace: Define auxtrace record alignment

[Adrian Hunter]

Define auxtrace record alignment so that it can be referenced elsewhere.

Note this is preparation for patch "perf intel-pt: Fix overlap calculation
for padding"

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
---
 tools/perf/util/auxtrace.c | 4 ++--
 tools/perf/util/auxtrace.h | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 94a22cc8004c..ad186d3255d1 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1279,9 +1279,9 @@ static int __auxtrace_mmap__read(struct perf_mmap *map,
 	}
 
 	/* padding must be written by fn() e.g. record__process_auxtrace() */
-	padding = size & 7;
+	padding = size & (PERF_AUXTRACE_RECORD_ALIGNMENT - 1);
 	if (padding)
-		padding = 8 - padding;
+		padding = PERF_AUXTRACE_RECORD_ALIGNMENT - padding;
 
 	memset(&ev, 0, sizeof(ev));
 	ev.auxtrace.header.type = PERF_RECORD_AUXTRACE;
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 8e50f96d4b23..fac32482db61 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -40,6 +40,9 @@ struct record_opts;
 struct auxtrace_info_event;
 struct events_stats;
 
+/* Auxtrace records must have the same alignment as perf event records */
+#define PERF_AUXTRACE_RECORD_ALIGNMENT 8
+
 enum auxtrace_type {
 	PERF_AUXTRACE_UNKNOWN,
 	PERF_AUXTRACE_INTEL_PT,
-- 
2.17.1

[PATCH 2/5] perf intel-pt: Fix overlap calculation for padding

[Adrian Hunter]

Auxtrace records might have up to 7 bytes of padding appended. Adjust the
overlap accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
---
 .../util/intel-pt-decoder/intel-pt-decoder.c  | 36 +++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 4503f3ca45ab..ecd25cdc1d3e 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -26,6 +26,7 @@
 
 #include "../cache.h"
 #include "../util.h"
+#include "../auxtrace.h"
 
 #include "intel-pt-insn-decoder.h"
 #include "intel-pt-pkt-decoder.h"
@@ -2575,6 +2576,34 @@ static int intel_pt_tsc_cmp(uint64_t tsc1, uint64_t tsc2)
 	}
 }
 
+#define MAX_PADDING (PERF_AUXTRACE_RECORD_ALIGNMENT - 1)
+
+/**
+ * adj_for_padding - adjust overlap to account for padding.
+ * @buf_b: second buffer
+ * @buf_a: first buffer
+ * @len_a: size of first buffer
+ *
+ * @buf_a might have up to 7 bytes of padding appended. Adjust the overlap
+ * accordingly.
+ *
+ * Return: A pointer into @buf_b from where non-overlapped data starts
+ */
+static unsigned char *adj_for_padding(unsigned char *buf_b,
+				      unsigned char *buf_a, size_t len_a)
+{
+	unsigned char *p = buf_b - MAX_PADDING;
+	unsigned char *q = buf_a + len_a - MAX_PADDING;
+	int i;
+
+	for (i = MAX_PADDING; i; i--, p++, q++) {
+		if (*p != *q)
+			break;
+	}
+
+	return p;
+}
+
 /**
  * intel_pt_find_overlap_tsc - determine start of non-overlapped trace data
  *                             using TSC.
@@ -2625,8 +2654,11 @@ static unsigned char *intel_pt_find_overlap_tsc(unsigned char *buf_a,
 
 			/* Same TSC, so buffers are consecutive */
 			if (!cmp && rem_b >= rem_a) {
+				unsigned char *start;
+
 				*consecutive = true;
-				return buf_b + len_b - (rem_b - rem_a);
+				start = buf_b + len_b - (rem_b - rem_a);
+				return adj_for_padding(start, buf_a, len_a);
 			}
 			if (cmp < 0)
 				return buf_b; /* tsc_a < tsc_b => no overlap */
@@ -2689,7 +2721,7 @@ unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
 		found = memmem(buf_a, len_a, buf_b, len_a);
 		if (found) {
 			*consecutive = true;
-			return buf_b + len_a;
+			return adj_for_padding(buf_b + len_a, buf_a, len_a);
 		}
 
 		/* Try again at next PSB in buffer 'a' */
-- 
2.17.1

[PATCH 3/5] perf intel-pt: Fix CYC timestamp calculation after OVF

[Adrian Hunter]

CYC packet timestamp calculation depends upon CBR which was being
cleared upon overflow (OVF). That can cause errors due to failing to
synchronize with sideband events. Even if a CBR change has been lost,
the old CBR is still a better estimate than zero. So remove the clearing
of CBR.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index ecd25cdc1d3e..a54d6c9a4601 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1395,7 +1395,6 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
 {
 	intel_pt_log("ERROR: Buffer overflow\n");
 	intel_pt_clear_tx_flags(decoder);
-	decoder->cbr = 0;
 	decoder->timestamp_insn_cnt = 0;
 	decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
 	decoder->overflow = true;
-- 
2.17.1

[PATCH 4/5] perf intel-pt: Packet splitting can happen only on 32-bit

[Adrian Hunter]

Data is copied when the trace is stopped, so packets are never split
between buffers except when processing if the buffer cannot fit in the
address space which can only happen on 32-bit systems. Change the logic to
reflect that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index a54d6c9a4601..6e03db142091 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -868,7 +868,7 @@ static int intel_pt_get_next_packet(struct intel_pt_decoder *decoder)
 
 		ret = intel_pt_get_packet(decoder->buf, decoder->len,
 					  &decoder->packet);
-		if (ret == INTEL_PT_NEED_MORE_BYTES &&
+		if (ret == INTEL_PT_NEED_MORE_BYTES && BITS_PER_LONG == 32 &&
 		    decoder->len < INTEL_PT_PKT_MAX_SZ && !decoder->next_buf) {
 			ret = intel_pt_get_split_packet(decoder);
 			if (ret < 0)
-- 
2.17.1

[PATCH 5/5] perf auxtrace: Add timestamp to auxtrace errors

[Adrian Hunter]

The timestamp can use useful to find part of a trace that has an error
without outputting all of the trace e.g. using the itrace 's' option to
skip initial number of events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/auxtrace.c    | 22 ++++++++++++++++++++--
 tools/perf/util/auxtrace.h    |  2 +-
 tools/perf/util/event.h       |  3 ++-
 tools/perf/util/intel-bts.c   |  4 ++--
 tools/perf/util/intel-pt.c    | 23 ++++++++++++++++-------
 tools/perf/util/s390-cpumsf.c |  7 ++++---
 tools/perf/util/session.c     |  3 +++
 7 files changed, 48 insertions(+), 16 deletions(-)

diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index ad186d3255d1..267e54df511b 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -27,6 +27,7 @@
 #include <linux/bitops.h>
 #include <linux/log2.h>
 #include <linux/string.h>
+#include <linux/time64.h>
 
 #include <sys/param.h>
 #include <stdlib.h>
@@ -858,7 +859,7 @@ void auxtrace_buffer__free(struct auxtrace_buffer *buffer)
 
 void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
-			  const char *msg)
+			  const char *msg, u64 timestamp)
 {
 	size_t size;
 
@@ -870,7 +871,9 @@ void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 	auxtrace_error->cpu = cpu;
 	auxtrace_error->pid = pid;
 	auxtrace_error->tid = tid;
+	auxtrace_error->fmt = 1;
 	auxtrace_error->ip = ip;
+	auxtrace_error->time = timestamp;
 	strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
 
 	size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
@@ -1160,12 +1163,27 @@ static const char *auxtrace_error_name(int type)
 size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp)
 {
 	struct auxtrace_error_event *e = &event->auxtrace_error;
+	unsigned long long nsecs = e->time;
+	const char *msg = e->msg;
 	int ret;
 
 	ret = fprintf(fp, " %s error type %u",
 		      auxtrace_error_name(e->type), e->type);
+
+	if (e->fmt && nsecs) {
+		unsigned long secs = nsecs / NSEC_PER_SEC;
+
+		nsecs -= secs * NSEC_PER_SEC;
+		ret += fprintf(fp, " time %lu.%09llu", secs, nsecs);
+	} else {
+		ret += fprintf(fp, " time 0");
+	}
+
+	if (!e->fmt)
+		msg = (const char *)&e->time;
+
 	ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRIx64" code %u: %s\n",
-		       e->cpu, e->pid, e->tid, e->ip, e->code, e->msg);
+		       e->cpu, e->pid, e->tid, e->ip, e->code, msg);
 	return ret;
 }
 
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index fac32482db61..c69bcd9a3091 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -519,7 +519,7 @@ void auxtrace_index__free(struct list_head *head);
 
 void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
-			  const char *msg);
+			  const char *msg, u64 timestamp);
 
 int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
 					 struct perf_tool *tool,
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index feba1aa819b4..36ae7e92dab1 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -532,8 +532,9 @@ struct auxtrace_error_event {
 	u32 cpu;
 	u32 pid;
 	u32 tid;
-	u32 reserved__; /* For alignment */
+	u32 fmt;
 	u64 ip;
+	u64 time;
 	char msg[MAX_AUXTRACE_ERROR_MSG];
 };
 
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index f99ac0cbe3ff..0c0180c67574 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -144,7 +144,7 @@ static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
 
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
 			     INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
-			     sample->tid, 0, "Lost trace data");
+			     sample->tid, 0, "Lost trace data", sample->time);
 
 	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
 	if (err)
@@ -374,7 +374,7 @@ static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
 
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
 			     INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
-			     "Failed to get instruction");
+			     "Failed to get instruction", 0);
 
 	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
 	if (err)
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 2e72373ec6df..3b497bab4324 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1411,7 +1411,7 @@ static int intel_pt_synth_pwrx_sample(struct intel_pt_queue *ptq)
 }
 
 static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
-				pid_t pid, pid_t tid, u64 ip)
+				pid_t pid, pid_t tid, u64 ip, u64 timestamp)
 {
 	union perf_event event;
 	char msg[MAX_AUXTRACE_ERROR_MSG];
@@ -1420,7 +1420,7 @@ static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
 	intel_pt__strerror(code, msg, MAX_AUXTRACE_ERROR_MSG);
 
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
-			     code, cpu, pid, tid, ip, msg);
+			     code, cpu, pid, tid, ip, msg, timestamp);
 
 	err = perf_session__deliver_synth_event(pt->session, &event, NULL);
 	if (err)
@@ -1430,6 +1430,18 @@ static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
 	return err;
 }
 
+static int intel_ptq_synth_error(struct intel_pt_queue *ptq,
+				 const struct intel_pt_state *state)
+{
+	struct intel_pt *pt = ptq->pt;
+	u64 tm = ptq->timestamp;
+
+	tm = pt->timeless_decoding ? 0 : tsc_to_perf_time(tm, &pt->tc);
+
+	return intel_pt_synth_error(pt, state->err, ptq->cpu, ptq->pid,
+				    ptq->tid, state->from_ip, tm);
+}
+
 static int intel_pt_next_tid(struct intel_pt *pt, struct intel_pt_queue *ptq)
 {
 	struct auxtrace_queue *queue;
@@ -1676,10 +1688,7 @@ static int intel_pt_run_decoder(struct intel_pt_queue *ptq, u64 *timestamp)
 				intel_pt_next_tid(pt, ptq);
 			}
 			if (pt->synth_opts.errors) {
-				err = intel_pt_synth_error(pt, state->err,
-							   ptq->cpu, ptq->pid,
-							   ptq->tid,
-							   state->from_ip);
+				err = intel_ptq_synth_error(ptq, state);
 				if (err)
 					return err;
 			}
@@ -1804,7 +1813,7 @@ static int intel_pt_process_timeless_queues(struct intel_pt *pt, pid_t tid,
 static int intel_pt_lost(struct intel_pt *pt, struct perf_sample *sample)
 {
 	return intel_pt_synth_error(pt, INTEL_PT_ERR_LOST, sample->cpu,
-				    sample->pid, sample->tid, 0);
+				    sample->pid, sample->tid, 0, sample->time);
 }
 
 static struct intel_pt_queue *intel_pt_cpu_to_ptq(struct intel_pt *pt, int cpu)
diff --git a/tools/perf/util/s390-cpumsf.c b/tools/perf/util/s390-cpumsf.c
index 835249c77f56..d9525d220db1 100644
--- a/tools/perf/util/s390-cpumsf.c
+++ b/tools/perf/util/s390-cpumsf.c
@@ -819,7 +819,7 @@ static int s390_cpumsf_process_queues(struct s390_cpumsf *sf, u64 timestamp)
 }
 
 static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
-				   pid_t pid, pid_t tid, u64 ip)
+				   pid_t pid, pid_t tid, u64 ip, u64 timestamp)
 {
 	char msg[MAX_AUXTRACE_ERROR_MSG];
 	union perf_event event;
@@ -827,7 +827,7 @@ static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
 
 	strncpy(msg, "Lost Auxiliary Trace Buffer", sizeof(msg) - 1);
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
-			     code, cpu, pid, tid, ip, msg);
+			     code, cpu, pid, tid, ip, msg, timestamp);
 
 	err = perf_session__deliver_synth_event(sf->session, &event, NULL);
 	if (err)
@@ -839,7 +839,8 @@ static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
 static int s390_cpumsf_lost(struct s390_cpumsf *sf, struct perf_sample *sample)
 {
 	return s390_cpumsf_synth_error(sf, 1, sample->cpu,
-				       sample->pid, sample->tid, 0);
+				       sample->pid, sample->tid, 0,
+				       sample->time);
 }
 
 static int
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 2012396abb7c..18fb9c8cbf9c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -703,7 +703,10 @@ static void perf_event__auxtrace_error_swap(union perf_event *event,
 	event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
 	event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
 	event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
+	event->auxtrace_error.fmt  = bswap_32(event->auxtrace_error.fmt);
 	event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
+	if (event->auxtrace_error.fmt)
+		event->auxtrace_error.time = bswap_64(event->auxtrace_error.time);
 }
 
 static void perf_event__thread_map_swap(union perf_event *event,
-- 
2.17.1

[tip:perf/core] perf auxtrace: Define auxtrace record alignment

[tip-bot for Adrian Hunter]

Commit-ID:  c3fcadf0bb765faf45d6d562246e1d08885466df
Gitweb:     https://git.kernel.org/tip/c3fcadf0bb765faf45d6d562246e1d08885466df
Author:     Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Wed, 6 Feb 2019 12:39:43 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Feb 2019 10:25:39 -0300

perf auxtrace: Define auxtrace record alignment

Define auxtrace record alignment so that it can be referenced elsewhere.

Note this is preparation for patch "perf intel-pt: Fix overlap calculation
for padding"

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20190206103947.15750-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/auxtrace.c | 4 ++--
 tools/perf/util/auxtrace.h | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 94a22cc8004c..ad186d3255d1 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1279,9 +1279,9 @@ static int __auxtrace_mmap__read(struct perf_mmap *map,
 	}
 
 	/* padding must be written by fn() e.g. record__process_auxtrace() */
-	padding = size & 7;
+	padding = size & (PERF_AUXTRACE_RECORD_ALIGNMENT - 1);
 	if (padding)
-		padding = 8 - padding;
+		padding = PERF_AUXTRACE_RECORD_ALIGNMENT - padding;
 
 	memset(&ev, 0, sizeof(ev));
 	ev.auxtrace.header.type = PERF_RECORD_AUXTRACE;
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 8e50f96d4b23..fac32482db61 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -40,6 +40,9 @@ struct record_opts;
 struct auxtrace_info_event;
 struct events_stats;
 
+/* Auxtrace records must have the same alignment as perf event records */
+#define PERF_AUXTRACE_RECORD_ALIGNMENT 8
+
 enum auxtrace_type {
 	PERF_AUXTRACE_UNKNOWN,
 	PERF_AUXTRACE_INTEL_PT,

[tip:perf/core] perf intel-pt: Fix overlap calculation for padding

[tip-bot for Adrian Hunter]

Commit-ID:  5a99d99e3310a565b0cf63f785b347be9ee0da45
Gitweb:     https://git.kernel.org/tip/5a99d99e3310a565b0cf63f785b347be9ee0da45
Author:     Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Wed, 6 Feb 2019 12:39:44 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Feb 2019 10:27:00 -0300

perf intel-pt: Fix overlap calculation for padding

Auxtrace records might have up to 7 bytes of padding appended. Adjust
the overlap accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20190206103947.15750-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 .../perf/util/intel-pt-decoder/intel-pt-decoder.c  | 36 ++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 4503f3ca45ab..ecd25cdc1d3e 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -26,6 +26,7 @@
 
 #include "../cache.h"
 #include "../util.h"
+#include "../auxtrace.h"
 
 #include "intel-pt-insn-decoder.h"
 #include "intel-pt-pkt-decoder.h"
@@ -2575,6 +2576,34 @@ static int intel_pt_tsc_cmp(uint64_t tsc1, uint64_t tsc2)
 	}
 }
 
+#define MAX_PADDING (PERF_AUXTRACE_RECORD_ALIGNMENT - 1)
+
+/**
+ * adj_for_padding - adjust overlap to account for padding.
+ * @buf_b: second buffer
+ * @buf_a: first buffer
+ * @len_a: size of first buffer
+ *
+ * @buf_a might have up to 7 bytes of padding appended. Adjust the overlap
+ * accordingly.
+ *
+ * Return: A pointer into @buf_b from where non-overlapped data starts
+ */
+static unsigned char *adj_for_padding(unsigned char *buf_b,
+				      unsigned char *buf_a, size_t len_a)
+{
+	unsigned char *p = buf_b - MAX_PADDING;
+	unsigned char *q = buf_a + len_a - MAX_PADDING;
+	int i;
+
+	for (i = MAX_PADDING; i; i--, p++, q++) {
+		if (*p != *q)
+			break;
+	}
+
+	return p;
+}
+
 /**
  * intel_pt_find_overlap_tsc - determine start of non-overlapped trace data
  *                             using TSC.
@@ -2625,8 +2654,11 @@ static unsigned char *intel_pt_find_overlap_tsc(unsigned char *buf_a,
 
 			/* Same TSC, so buffers are consecutive */
 			if (!cmp && rem_b >= rem_a) {
+				unsigned char *start;
+
 				*consecutive = true;
-				return buf_b + len_b - (rem_b - rem_a);
+				start = buf_b + len_b - (rem_b - rem_a);
+				return adj_for_padding(start, buf_a, len_a);
 			}
 			if (cmp < 0)
 				return buf_b; /* tsc_a < tsc_b => no overlap */
@@ -2689,7 +2721,7 @@ unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
 		found = memmem(buf_a, len_a, buf_b, len_a);
 		if (found) {
 			*consecutive = true;
-			return buf_b + len_a;
+			return adj_for_padding(buf_b + len_a, buf_a, len_a);
 		}
 
 		/* Try again at next PSB in buffer 'a' */

[tip:perf/core] perf intel-pt: Fix CYC timestamp calculation after OVF

[tip-bot for Adrian Hunter]

Commit-ID:  03997612904866abe7cdcc992784ef65cb3a4b81
Gitweb:     https://git.kernel.org/tip/03997612904866abe7cdcc992784ef65cb3a4b81
Author:     Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Wed, 6 Feb 2019 12:39:45 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Feb 2019 10:27:27 -0300

perf intel-pt: Fix CYC timestamp calculation after OVF

CYC packet timestamp calculation depends upon CBR which was being
cleared upon overflow (OVF). That can cause errors due to failing to
synchronize with sideband events. Even if a CBR change has been lost,
the old CBR is still a better estimate than zero. So remove the clearing
of CBR.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20190206103947.15750-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index ecd25cdc1d3e..a54d6c9a4601 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1395,7 +1395,6 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
 {
 	intel_pt_log("ERROR: Buffer overflow\n");
 	intel_pt_clear_tx_flags(decoder);
-	decoder->cbr = 0;
 	decoder->timestamp_insn_cnt = 0;
 	decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
 	decoder->overflow = true;

[tip:perf/core] perf intel-pt: Packet splitting can happen only on 32-bit

[tip-bot for Adrian Hunter]

Commit-ID:  26ee2bcdea33c60aa833cc32a1624ef5d49c9c6f
Gitweb:     https://git.kernel.org/tip/26ee2bcdea33c60aa833cc32a1624ef5d49c9c6f
Author:     Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Wed, 6 Feb 2019 12:39:46 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Feb 2019 10:27:54 -0300

perf intel-pt: Packet splitting can happen only on 32-bit

Data is copied when the trace is stopped, so packets are never split
between buffers except when processing if the buffer cannot fit in the
address space which can only happen on 32-bit systems. Change the logic
to reflect that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190206103947.15750-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index a54d6c9a4601..6e03db142091 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -868,7 +868,7 @@ static int intel_pt_get_next_packet(struct intel_pt_decoder *decoder)
 
 		ret = intel_pt_get_packet(decoder->buf, decoder->len,
 					  &decoder->packet);
-		if (ret == INTEL_PT_NEED_MORE_BYTES &&
+		if (ret == INTEL_PT_NEED_MORE_BYTES && BITS_PER_LONG == 32 &&
 		    decoder->len < INTEL_PT_PKT_MAX_SZ && !decoder->next_buf) {
 			ret = intel_pt_get_split_packet(decoder);
 			if (ret < 0)

[tip:perf/core] perf auxtrace: Add timestamp to auxtrace errors

[tip-bot for Adrian Hunter]

Commit-ID:  16bd4321c2425d37031a902cdbf183e2cd099946
Gitweb:     https://git.kernel.org/tip/16bd4321c2425d37031a902cdbf183e2cd099946
Author:     Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Wed, 6 Feb 2019 12:39:47 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Feb 2019 11:20:32 -0300

perf auxtrace: Add timestamp to auxtrace errors

The timestamp can use useful to find part of a trace that has an error
without outputting all of the trace e.g. using the itrace 's' option to
skip initial number of events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190206103947.15750-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/auxtrace.c    | 22 ++++++++++++++++++++--
 tools/perf/util/auxtrace.h    |  2 +-
 tools/perf/util/event.h       |  3 ++-
 tools/perf/util/intel-bts.c   |  4 ++--
 tools/perf/util/intel-pt.c    | 23 ++++++++++++++++-------
 tools/perf/util/s390-cpumsf.c |  7 ++++---
 tools/perf/util/session.c     |  3 +++
 7 files changed, 48 insertions(+), 16 deletions(-)

diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index ad186d3255d1..267e54df511b 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -27,6 +27,7 @@
 #include <linux/bitops.h>
 #include <linux/log2.h>
 #include <linux/string.h>
+#include <linux/time64.h>
 
 #include <sys/param.h>
 #include <stdlib.h>
@@ -858,7 +859,7 @@ void auxtrace_buffer__free(struct auxtrace_buffer *buffer)
 
 void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
-			  const char *msg)
+			  const char *msg, u64 timestamp)
 {
 	size_t size;
 
@@ -870,7 +871,9 @@ void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 	auxtrace_error->cpu = cpu;
 	auxtrace_error->pid = pid;
 	auxtrace_error->tid = tid;
+	auxtrace_error->fmt = 1;
 	auxtrace_error->ip = ip;
+	auxtrace_error->time = timestamp;
 	strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
 
 	size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
@@ -1160,12 +1163,27 @@ static const char *auxtrace_error_name(int type)
 size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp)
 {
 	struct auxtrace_error_event *e = &event->auxtrace_error;
+	unsigned long long nsecs = e->time;
+	const char *msg = e->msg;
 	int ret;
 
 	ret = fprintf(fp, " %s error type %u",
 		      auxtrace_error_name(e->type), e->type);
+
+	if (e->fmt && nsecs) {
+		unsigned long secs = nsecs / NSEC_PER_SEC;
+
+		nsecs -= secs * NSEC_PER_SEC;
+		ret += fprintf(fp, " time %lu.%09llu", secs, nsecs);
+	} else {
+		ret += fprintf(fp, " time 0");
+	}
+
+	if (!e->fmt)
+		msg = (const char *)&e->time;
+
 	ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRIx64" code %u: %s\n",
-		       e->cpu, e->pid, e->tid, e->ip, e->code, e->msg);
+		       e->cpu, e->pid, e->tid, e->ip, e->code, msg);
 	return ret;
 }
 
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index fac32482db61..c69bcd9a3091 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -519,7 +519,7 @@ void auxtrace_index__free(struct list_head *head);
 
 void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
-			  const char *msg);
+			  const char *msg, u64 timestamp);
 
 int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
 					 struct perf_tool *tool,
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index feba1aa819b4..36ae7e92dab1 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -532,8 +532,9 @@ struct auxtrace_error_event {
 	u32 cpu;
 	u32 pid;
 	u32 tid;
-	u32 reserved__; /* For alignment */
+	u32 fmt;
 	u64 ip;
+	u64 time;
 	char msg[MAX_AUXTRACE_ERROR_MSG];
 };
 
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index f99ac0cbe3ff..0c0180c67574 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -144,7 +144,7 @@ static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
 
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
 			     INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
-			     sample->tid, 0, "Lost trace data");
+			     sample->tid, 0, "Lost trace data", sample->time);
 
 	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
 	if (err)
@@ -374,7 +374,7 @@ static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
 
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
 			     INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
-			     "Failed to get instruction");
+			     "Failed to get instruction", 0);
 
 	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
 	if (err)
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 2e72373ec6df..3b497bab4324 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1411,7 +1411,7 @@ static int intel_pt_synth_pwrx_sample(struct intel_pt_queue *ptq)
 }
 
 static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
-				pid_t pid, pid_t tid, u64 ip)
+				pid_t pid, pid_t tid, u64 ip, u64 timestamp)
 {
 	union perf_event event;
 	char msg[MAX_AUXTRACE_ERROR_MSG];
@@ -1420,7 +1420,7 @@ static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
 	intel_pt__strerror(code, msg, MAX_AUXTRACE_ERROR_MSG);
 
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
-			     code, cpu, pid, tid, ip, msg);
+			     code, cpu, pid, tid, ip, msg, timestamp);
 
 	err = perf_session__deliver_synth_event(pt->session, &event, NULL);
 	if (err)
@@ -1430,6 +1430,18 @@ static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,
 	return err;
 }
 
+static int intel_ptq_synth_error(struct intel_pt_queue *ptq,
+				 const struct intel_pt_state *state)
+{
+	struct intel_pt *pt = ptq->pt;
+	u64 tm = ptq->timestamp;
+
+	tm = pt->timeless_decoding ? 0 : tsc_to_perf_time(tm, &pt->tc);
+
+	return intel_pt_synth_error(pt, state->err, ptq->cpu, ptq->pid,
+				    ptq->tid, state->from_ip, tm);
+}
+
 static int intel_pt_next_tid(struct intel_pt *pt, struct intel_pt_queue *ptq)
 {
 	struct auxtrace_queue *queue;
@@ -1676,10 +1688,7 @@ static int intel_pt_run_decoder(struct intel_pt_queue *ptq, u64 *timestamp)
 				intel_pt_next_tid(pt, ptq);
 			}
 			if (pt->synth_opts.errors) {
-				err = intel_pt_synth_error(pt, state->err,
-							   ptq->cpu, ptq->pid,
-							   ptq->tid,
-							   state->from_ip);
+				err = intel_ptq_synth_error(ptq, state);
 				if (err)
 					return err;
 			}
@@ -1804,7 +1813,7 @@ static int intel_pt_process_timeless_queues(struct intel_pt *pt, pid_t tid,
 static int intel_pt_lost(struct intel_pt *pt, struct perf_sample *sample)
 {
 	return intel_pt_synth_error(pt, INTEL_PT_ERR_LOST, sample->cpu,
-				    sample->pid, sample->tid, 0);
+				    sample->pid, sample->tid, 0, sample->time);
 }
 
 static struct intel_pt_queue *intel_pt_cpu_to_ptq(struct intel_pt *pt, int cpu)
diff --git a/tools/perf/util/s390-cpumsf.c b/tools/perf/util/s390-cpumsf.c
index 835249c77f56..d9525d220db1 100644
--- a/tools/perf/util/s390-cpumsf.c
+++ b/tools/perf/util/s390-cpumsf.c
@@ -819,7 +819,7 @@ static int s390_cpumsf_process_queues(struct s390_cpumsf *sf, u64 timestamp)
 }
 
 static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
-				   pid_t pid, pid_t tid, u64 ip)
+				   pid_t pid, pid_t tid, u64 ip, u64 timestamp)
 {
 	char msg[MAX_AUXTRACE_ERROR_MSG];
 	union perf_event event;
@@ -827,7 +827,7 @@ static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
 
 	strncpy(msg, "Lost Auxiliary Trace Buffer", sizeof(msg) - 1);
 	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
-			     code, cpu, pid, tid, ip, msg);
+			     code, cpu, pid, tid, ip, msg, timestamp);
 
 	err = perf_session__deliver_synth_event(sf->session, &event, NULL);
 	if (err)
@@ -839,7 +839,8 @@ static int s390_cpumsf_synth_error(struct s390_cpumsf *sf, int code, int cpu,
 static int s390_cpumsf_lost(struct s390_cpumsf *sf, struct perf_sample *sample)
 {
 	return s390_cpumsf_synth_error(sf, 1, sample->cpu,
-				       sample->pid, sample->tid, 0);
+				       sample->pid, sample->tid, 0,
+				       sample->time);
 }
 
 static int
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 2012396abb7c..18fb9c8cbf9c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -703,7 +703,10 @@ static void perf_event__auxtrace_error_swap(union perf_event *event,
 	event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
 	event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
 	event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
+	event->auxtrace_error.fmt  = bswap_32(event->auxtrace_error.fmt);
 	event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
+	if (event->auxtrace_error.fmt)
+		event->auxtrace_error.time = bswap_64(event->auxtrace_error.time);
 }
 
 static void perf_event__thread_map_swap(union perf_event *event,