perf/core improvements and fixes

. Improve warning message when libunwind devel packages not present, from Jiri Olsa
 
 . Remove perf_event_attr needless version inflation, from Jiri Olsa
 
 . Introduce libtraceevent strerror like error reporting facility, from Namhyung Kim
 
 . Add pmu mappings to perf.data header and use event names from cmd line, from Robert Richter
 
 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

 * Improve warning message when libunwind devel packages not present, from Jiri Olsa

 * Remove perf_event_attr needless version inflation, from Jiri Olsa

 * Introduce libtraceevent strerror like error reporting facility, from Namhyung Kim

 * Add pmu mappings to perf.data header and use event names from cmd line, from Robert Richter

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/perf_event.h

@@ -205,8 +205,8 @@ enum perf_event_read_format {
 #define PERF_ATTR_SIZE_VER0	64	/* sizeof first published struct */
 #define PERF_ATTR_SIZE_VER1	72	/* add: config2 */
 #define PERF_ATTR_SIZE_VER2	80	/* add: branch_sample_type */
-#define PERF_ATTR_SIZE_VER3	88	/* add: sample_regs_user */
+#define PERF_ATTR_SIZE_VER3	96	/* add: sample_regs_user */
-#define PERF_ATTR_SIZE_VER4	96	/* add: sample_stack_user */
+					/* add: sample_stack_user */
 
 /*
  * Hardware event_id to monitor via a performance monitoring event:

tools/lib/traceevent/event-parse.c

@@ -4686,9 +4686,8 @@ static int find_event_handle(struct pevent *pevent, struct event_format *event)
  *
  * /sys/kernel/debug/tracing/events/.../.../format
  */
-int pevent_parse_event(struct pevent *pevent,
+enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf,
-		       const char *buf, unsigned long size,
+				     unsigned long size, const char *sys)
-		       const char *sys)
 {
 	struct event_format *event;
 	int ret;
@@ -4697,17 +4696,16 @@ int pevent_parse_event(struct pevent *pevent,
 
 	event = alloc_event();
 	if (!event)
-		return -ENOMEM;
+		return PEVENT_ERRNO__MEM_ALLOC_FAILED;
 
 	event->name = event_read_name();
 	if (!event->name) {
 		/* Bad event? */
-		free(event);
+		ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
-		return -1;
+		goto event_alloc_failed;
 	}
 
 	if (strcmp(sys, "ftrace") == 0) {
-
 		event->flags |= EVENT_FL_ISFTRACE;
 
 		if (strcmp(event->name, "bprint") == 0)
@@ -4715,20 +4713,28 @@ int pevent_parse_event(struct pevent *pevent,
 	}
 		
 	event->id = event_read_id();
-	if (event->id < 0)
+	if (event->id < 0) {
-		die("failed to read event id");
+		ret = PEVENT_ERRNO__READ_ID_FAILED;
+		/*
+		 * This isn't an allocation error actually.
+		 * But as the ID is critical, just bail out.
+		 */
+		goto event_alloc_failed;
+	}
 
 	event->system = strdup(sys);
-	if (!event->system)
+	if (!event->system) {
-		die("failed to allocate system");
+		ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
+		goto event_alloc_failed;
+	}
 
 	/* Add pevent to event so that it can be referenced */
 	event->pevent = pevent;
 
 	ret = event_read_format(event);
 	if (ret < 0) {
-		do_warning("failed to read event format for %s", event->name);
+		ret = PEVENT_ERRNO__READ_FORMAT_FAILED;
-		goto event_failed;
+		goto event_parse_failed;
 	}
 
 	/*
@@ -4740,10 +4746,9 @@ int pevent_parse_event(struct pevent *pevent,
 
 	ret = event_read_print(event);
 	if (ret < 0) {
-		do_warning("failed to read event print fmt for %s",
-			   event->name);
 		show_warning = 1;
-		goto event_failed;
+		ret = PEVENT_ERRNO__READ_PRINT_FAILED;
+		goto event_parse_failed;
 	}
 	show_warning = 1;
 
@@ -4754,20 +4759,19 @@ int pevent_parse_event(struct pevent *pevent,
 		struct print_arg *arg, **list;
 
 		/* old ftrace had no args */
-
 		list = &event->print_fmt.args;
 		for (field = event->format.fields; field; field = field->next) {
 			arg = alloc_arg();
-			*list = arg;
-			list = &arg->next;
 			arg->type = PRINT_FIELD;
 			arg->field.name = strdup(field->name);
 			if (!arg->field.name) {
-				do_warning("failed to allocate field name");
 				event->flags |= EVENT_FL_FAILED;
-				return -1;
+				free_arg(arg);
+				return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
 			}
 			arg->field.field = field;
+			*list = arg;
+			list = &arg->next;
 		}
 		return 0;
 	}
@@ -4778,11 +4782,65 @@ int pevent_parse_event(struct pevent *pevent,
 
 	return 0;
 
- event_failed:
+ event_parse_failed:
 	event->flags |= EVENT_FL_FAILED;
 	/* still add it even if it failed */
 	add_event(pevent, event);
-	return -1;
+	return ret;
+
+ event_alloc_failed:
+	free(event->system);
+	free(event->name);
+	free(event);
+	return ret;
+}
+
+#undef _PE
+#define _PE(code, str) str
+static const char * const pevent_error_str[] = {
+	PEVENT_ERRORS
+};
+#undef _PE
+
+int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum,
+		    char *buf, size_t buflen)
+{
+	int idx;
+	const char *msg;
+
+	if (errnum >= 0) {
+		msg = strerror_r(errnum, buf, buflen);
+		if (msg != buf) {
+			size_t len = strlen(msg);
+			char *c = mempcpy(buf, msg, min(buflen-1, len));
+			*c = '\0';
+		}
+		return 0;
+	}
+
+	if (errnum <= __PEVENT_ERRNO__START ||
+	    errnum >= __PEVENT_ERRNO__END)
+		return -1;
+
+	idx = errnum - __PEVENT_ERRNO__START - 1;
+	msg = pevent_error_str[idx];
+
+	switch (errnum) {
+	case PEVENT_ERRNO__MEM_ALLOC_FAILED:
+	case PEVENT_ERRNO__PARSE_EVENT_FAILED:
+	case PEVENT_ERRNO__READ_ID_FAILED:
+	case PEVENT_ERRNO__READ_FORMAT_FAILED:
+	case PEVENT_ERRNO__READ_PRINT_FAILED:
+	case PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED:
+		snprintf(buf, buflen, "%s", msg);
+		break;
+
+	default:
+		/* cannot reach here */
+		break;
+	}
+
+	return 0;
 }
 
 int get_field_val(struct trace_seq *s, struct format_field *field,

tools/lib/traceevent/event-parse.h

@@ -345,6 +345,34 @@ enum pevent_flag {
 	PEVENT_NSEC_OUTPUT		= 1,	/* output in NSECS */
 };
 
+#define PEVENT_ERRORS 							      \
+	_PE(MEM_ALLOC_FAILED,	"failed to allocate memory"),		      \
+	_PE(PARSE_EVENT_FAILED,	"failed to parse event"),		      \
+	_PE(READ_ID_FAILED,	"failed to read event id"),		      \
+	_PE(READ_FORMAT_FAILED,	"failed to read event format"),		      \
+	_PE(READ_PRINT_FAILED,	"failed to read event print fmt"), 	      \
+	_PE(OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace")
+
+#undef _PE
+#define _PE(__code, __str) PEVENT_ERRNO__ ## __code
+enum pevent_errno {
+	PEVENT_ERRNO__SUCCESS			= 0,
+
+	/*
+	 * Choose an arbitrary negative big number not to clash with standard
+	 * errno since SUS requires the errno has distinct positive values.
+	 * See 'Issue 6' in the link below.
+	 *
+	 * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
+	 */
+	__PEVENT_ERRNO__START			= -100000,
+
+	PEVENT_ERRORS,
+
+	__PEVENT_ERRNO__END,
+};
+#undef _PE
+
 struct cmdline;
 struct cmdline_list;
 struct func_map;
@@ -509,8 +537,8 @@ void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
 int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
 			     int long_size);
 
-int pevent_parse_event(struct pevent *pevent, const char *buf,
+enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf,
-		       unsigned long size, const char *sys);
+				     unsigned long size, const char *sys);
 
 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
 			   const char *name, struct pevent_record *record,
@@ -561,6 +589,8 @@ int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec);
 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid);
 void pevent_event_info(struct trace_seq *s, struct event_format *event,
 		       struct pevent_record *record);
+int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum,
+		    char *buf, size_t buflen);
 
 struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type);
 struct format_field **pevent_event_common_fields(struct event_format *event);

tools/lib/traceevent/event-utils.h

@@ -39,6 +39,12 @@ void __vdie(const char *fmt, ...);
 void __vwarning(const char *fmt, ...);
 void __vpr_stat(const char *fmt, ...);
 
+#define min(x, y) ({				\
+	typeof(x) _min1 = (x);			\
+	typeof(y) _min2 = (y);			\
+	(void) (&_min1 == &_min2);		\
+	_min1 < _min2 ? _min1 : _min2; })
+
 static inline char *strim(char *string)
 {
 	char *ret;

tools/perf/Makefile

@@ -493,7 +493,7 @@ endif
 
 FLAGS_UNWIND=$(LIBUNWIND_CFLAGS) $(ALL_CFLAGS) $(LIBUNWIND_LDFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) $(LIBUNWIND_LIBS)
 ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND)),y)
-	msg := $(warning No libunwind found. Please install libunwind >= 0.99);
+	msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 0.99);
 	NO_LIBUNWIND := 1
 endif # Libunwind support
 endif # NO_LIBUNWIND

tools/perf/util/header.c

@@ -20,6 +20,7 @@
 #include "symbol.h"
 #include "debug.h"
 #include "cpumap.h"
+#include "pmu.h"
 
 static bool no_buildid_cache = false;
 
@@ -1003,6 +1004,45 @@ done:
 	return ret;
 }
 
+/*
+ * File format:
+ *
+ * struct pmu_mappings {
+ *	u32	pmu_num;
+ *	struct pmu_map {
+ *		u32	type;
+ *		char	name[];
+ *	}[pmu_num];
+ * };
+ */
+
+static int write_pmu_mappings(int fd, struct perf_header *h __used,
+			      struct perf_evlist *evlist __used)
+{
+	struct perf_pmu *pmu = NULL;
+	off_t offset = lseek(fd, 0, SEEK_CUR);
+	__u32 pmu_num = 0;
+
+	/* write real pmu_num later */
+	do_write(fd, &pmu_num, sizeof(pmu_num));
+
+	while ((pmu = perf_pmu__scan(pmu))) {
+		if (!pmu->name)
+			continue;
+		pmu_num++;
+		do_write(fd, &pmu->type, sizeof(pmu->type));
+		do_write_string(fd, pmu->name);
+	}
+
+	if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
+		/* discard all */
+		lseek(fd, offset, SEEK_SET);
+		return -1;
+	}
+
+	return 0;
+}
+
 /*
  * default get_cpuid(): nothing gets recorded
  * actual implementation must be in arch/$(ARCH)/util/header.c
@@ -1148,12 +1188,29 @@ static void print_cpu_topology(struct perf_header *ph, int fd, FILE *fp)
 	}
 }
 
-static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
+static void free_event_desc(struct perf_evsel *events)
 {
-	struct perf_event_attr attr;
+	struct perf_evsel *evsel;
-	uint64_t id;
+
+	if (!events)
+		return;
+
+	for (evsel = events; evsel->attr.size; evsel++) {
+		if (evsel->name)
+			free(evsel->name);
+		if (evsel->id)
+			free(evsel->id);
+	}
+
+	free(events);
+}
+
+static struct perf_evsel *
+read_event_desc(struct perf_header *ph, int fd)
+{
+	struct perf_evsel *evsel, *events = NULL;
+	u64 *id;
 	void *buf = NULL;
-	char *str;
 	u32 nre, sz, nr, i, j;
 	ssize_t ret;
 	size_t msz;
@@ -1173,18 +1230,22 @@ static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
 	if (ph->needs_swap)
 		sz = bswap_32(sz);
 
-	memset(&attr, 0, sizeof(attr));
-
 	/* buffer to hold on file attr struct */
 	buf = malloc(sz);
 	if (!buf)
 		goto error;
 
-	msz = sizeof(attr);
+	/* the last event terminates with evsel->attr.size == 0: */
+	events = calloc(nre + 1, sizeof(*events));
+	if (!events)
+		goto error;
+
+	msz = sizeof(evsel->attr);
 	if (sz < msz)
 		msz = sz;
 
-	for (i = 0 ; i < nre; i++) {
+	for (i = 0, evsel = events; i < nre; evsel++, i++) {
+		evsel->idx = i;
 
 		/*
 		 * must read entire on-file attr struct to
@@ -1197,7 +1258,7 @@ static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
 		if (ph->needs_swap)
 			perf_event__attr_swap(buf);
 
-		memcpy(&attr, buf, msz);
+		memcpy(&evsel->attr, buf, msz);
 
 		ret = read(fd, &nr, sizeof(nr));
 		if (ret != (ssize_t)sizeof(nr))
@@ -1206,51 +1267,82 @@ static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
 		if (ph->needs_swap)
 			nr = bswap_32(nr);
 
-		str = do_read_string(fd, ph);
+		evsel->name = do_read_string(fd, ph);
-		fprintf(fp, "# event : name = %s, ", str);
+
-		free(str);
+		if (!nr)
+			continue;
+
+		id = calloc(nr, sizeof(*id));
+		if (!id)
+			goto error;
+		evsel->ids = nr;
+		evsel->id = id;
+
+		for (j = 0 ; j < nr; j++) {
+			ret = read(fd, id, sizeof(*id));
+			if (ret != (ssize_t)sizeof(*id))
+				goto error;
+			if (ph->needs_swap)
+				*id = bswap_64(*id);
+			id++;
+		}
+	}
+out:
+	if (buf)
+		free(buf);
+	return events;
+error:
+	if (events)
+		free_event_desc(events);
+	events = NULL;
+	goto out;
+}
+
+static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
+{
+	struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
+	u32 j;
+	u64 *id;
+
+	if (!events) {
+		fprintf(fp, "# event desc: not available or unable to read\n");
+		return;
+	}
+
+	for (evsel = events; evsel->attr.size; evsel++) {
+		fprintf(fp, "# event : name = %s, ", evsel->name);
 
 		fprintf(fp, "type = %d, config = 0x%"PRIx64
 			    ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
-				attr.type,
+				evsel->attr.type,
-				(u64)attr.config,
+				(u64)evsel->attr.config,
-				(u64)attr.config1,
+				(u64)evsel->attr.config1,
-				(u64)attr.config2);
+				(u64)evsel->attr.config2);
 
 		fprintf(fp, ", excl_usr = %d, excl_kern = %d",
-				attr.exclude_user,
+				evsel->attr.exclude_user,
-				attr.exclude_kernel);
+				evsel->attr.exclude_kernel);
 
 		fprintf(fp, ", excl_host = %d, excl_guest = %d",
-				attr.exclude_host,
+				evsel->attr.exclude_host,
-				attr.exclude_guest);
+				evsel->attr.exclude_guest);
 
-		fprintf(fp, ", precise_ip = %d", attr.precise_ip);
+		fprintf(fp, ", precise_ip = %d", evsel->attr.precise_ip);
 
-		if (nr)
+		if (evsel->ids) {
 			fprintf(fp, ", id = {");
-
+			for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
-		for (j = 0 ; j < nr; j++) {
+				if (j)
-			ret = read(fd, &id, sizeof(id));
+					fputc(',', fp);
-			if (ret != (ssize_t)sizeof(id))
+				fprintf(fp, " %"PRIu64, *id);
-				goto error;
+			}
-
-			if (ph->needs_swap)
-				id = bswap_64(id);
-
-			if (j)
-				fputc(',', fp);
-
-			fprintf(fp, " %"PRIu64, id);
-		}
-		if (nr && j == nr)
 			fprintf(fp, " }");
+		}
+
 		fputc('\n', fp);
 	}
-	free(buf);
+
-	return;
+	free_event_desc(events);
-error:
-	fprintf(fp, "# event desc: not available or unable to read\n");
 }
 
 static void print_total_mem(struct perf_header *h __used, int fd, FILE *fp)
@@ -1337,6 +1429,43 @@ static void print_branch_stack(struct perf_header *ph __used, int fd __used,
 	fprintf(fp, "# contains samples with branch stack\n");
 }
 
+static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp)
+{
+	const char *delimiter = "# pmu mappings: ";
+	char *name;
+	int ret;
+	u32 pmu_num;
+	u32 type;
+
+	ret = read(fd, &pmu_num, sizeof(pmu_num));
+	if (ret != sizeof(pmu_num))
+		goto error;
+
+	if (!pmu_num) {
+		fprintf(fp, "# pmu mappings: not available\n");
+		return;
+	}
+
+	while (pmu_num) {
+		if (read(fd, &type, sizeof(type)) != sizeof(type))
+			break;
+		name = do_read_string(fd, ph);
+		if (!name)
+			break;
+		pmu_num--;
+		fprintf(fp, "%s%s = %" PRIu32, delimiter, name, type);
+		free(name);
+		delimiter = ", ";
+	}
+
+	fprintf(fp, "\n");
+
+	if (!pmu_num)
+		return;
+error:
+	fprintf(fp, "# pmu mappings: unable to read\n");
+}
+
 static int __event_process_build_id(struct build_id_event *bev,
 				    char *filename,
 				    struct perf_session *session)
@@ -1504,6 +1633,56 @@ static int process_build_id(struct perf_file_section *section,
 	return 0;
 }
 
+static struct perf_evsel *
+perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
+{
+	struct perf_evsel *evsel;
+
+	list_for_each_entry(evsel, &evlist->entries, node) {
+		if (evsel->idx == idx)
+			return evsel;
+	}
+
+	return NULL;
+}
+
+static void
+perf_evlist__set_event_name(struct perf_evlist *evlist, struct perf_evsel *event)
+{
+	struct perf_evsel *evsel;
+
+	if (!event->name)
+		return;
+
+	evsel = perf_evlist__find_by_index(evlist, event->idx);
+	if (!evsel)
+		return;
+
+	if (evsel->name)
+		return;
+
+	evsel->name = strdup(event->name);
+}
+
+static int
+process_event_desc(struct perf_file_section *section __unused,
+		   struct perf_header *header, int feat __unused, int fd,
+		   void *data __used)
+{
+	struct perf_session *session = container_of(header, struct perf_session, header);
+	struct perf_evsel *evsel, *events = read_event_desc(header, fd);
+
+	if (!events)
+		return 0;
+
+	for (evsel = events; evsel->attr.size; evsel++)
+		perf_evlist__set_event_name(session->evlist, evsel);
+
+	free_event_desc(events);
+
+	return 0;
+}
+
 struct feature_ops {
 	int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
 	void (*print)(struct perf_header *h, int fd, FILE *fp);
@@ -1537,11 +1716,12 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
 	FEAT_OPA(HEADER_CPUDESC,	cpudesc),
 	FEAT_OPA(HEADER_CPUID,		cpuid),
 	FEAT_OPA(HEADER_TOTAL_MEM,	total_mem),
-	FEAT_OPA(HEADER_EVENT_DESC,	event_desc),
+	FEAT_OPP(HEADER_EVENT_DESC,	event_desc),
 	FEAT_OPA(HEADER_CMDLINE,	cmdline),
 	FEAT_OPF(HEADER_CPU_TOPOLOGY,	cpu_topology),
 	FEAT_OPF(HEADER_NUMA_TOPOLOGY,	numa_topology),
 	FEAT_OPA(HEADER_BRANCH_STACK,	branch_stack),
+	FEAT_OPA(HEADER_PMU_MAPPINGS,	pmu_mappings),
 };
 
 struct header_print_data {
@@ -1831,7 +2011,6 @@ 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,
 };
 

tools/perf/util/header.h

@@ -28,6 +28,7 @@ enum {
 	HEADER_CPU_TOPOLOGY,
 	HEADER_NUMA_TOPOLOGY,
 	HEADER_BRANCH_STACK,
+	HEADER_PMU_MAPPINGS,
 	HEADER_LAST_FEATURE,
 	HEADER_FEAT_BITS	= 256,
 };

tools/perf/util/parse-events-test.c

@@ -301,12 +301,13 @@ static int test__checkevent_breakpoint_modifier(struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel = perf_evlist__first(evlist);
 
+
 	TEST_ASSERT_VAL("wrong exclude_user", !evsel->attr.exclude_user);
 	TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
 	TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
 	TEST_ASSERT_VAL("wrong name",
-			!strcmp(perf_evsel__name(evsel), "mem:0x0:rw:u"));
+			!strcmp(perf_evsel__name(evsel), "mem:0:u"));
 
 	return test__checkevent_breakpoint(evlist);
 }
@@ -320,7 +321,7 @@ static int test__checkevent_breakpoint_x_modifier(struct perf_evlist *evlist)
 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
 	TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
 	TEST_ASSERT_VAL("wrong name",
-			!strcmp(perf_evsel__name(evsel), "mem:0x0:x:k"));
+			!strcmp(perf_evsel__name(evsel), "mem:0:x:k"));
 
 	return test__checkevent_breakpoint_x(evlist);
 }
@@ -334,7 +335,7 @@ static int test__checkevent_breakpoint_r_modifier(struct perf_evlist *evlist)
 	TEST_ASSERT_VAL("wrong exclude_hv", !evsel->attr.exclude_hv);
 	TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
 	TEST_ASSERT_VAL("wrong name",
-			!strcmp(perf_evsel__name(evsel), "mem:0x0:r:hp"));
+			!strcmp(perf_evsel__name(evsel), "mem:0:r:hp"));
 
 	return test__checkevent_breakpoint_r(evlist);
 }
@@ -348,7 +349,7 @@ static int test__checkevent_breakpoint_w_modifier(struct perf_evlist *evlist)
 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
 	TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
 	TEST_ASSERT_VAL("wrong name",
-			!strcmp(perf_evsel__name(evsel), "mem:0x0:w:up"));
+			!strcmp(perf_evsel__name(evsel), "mem:0:w:up"));
 
 	return test__checkevent_breakpoint_w(evlist);
 }
@@ -362,7 +363,7 @@ static int test__checkevent_breakpoint_rw_modifier(struct perf_evlist *evlist)
 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
 	TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
 	TEST_ASSERT_VAL("wrong name",
-			!strcmp(perf_evsel__name(evsel), "mem:0x0:rw:kp"));
+			!strcmp(perf_evsel__name(evsel), "mem:0:rw:kp"));
 
 	return test__checkevent_breakpoint_rw(evlist);
 }
@@ -437,7 +438,7 @@ static int test__checkevent_pmu_name(struct perf_evlist *evlist)
 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_RAW == evsel->attr.type);
 	TEST_ASSERT_VAL("wrong config",  2 == evsel->attr.config);
 	TEST_ASSERT_VAL("wrong name",
-			!strcmp(perf_evsel__name(evsel), "raw 0x2:u"));
+			!strcmp(perf_evsel__name(evsel), "cpu/config=2/u"));
 
 	return 0;
 }
@@ -948,19 +949,19 @@ static int test_event(struct test__event_st *e)
 
 static int test_events(struct test__event_st *events, unsigned cnt)
 {
-	int ret = 0;
+	int ret1, ret2 = 0;
 	unsigned i;
 
 	for (i = 0; i < cnt; i++) {
 		struct test__event_st *e = &events[i];
 
 		pr_debug("running test %d '%s'\n", i, e->name);
-		ret = test_event(e);
+		ret1 = test_event(e);
-		if (ret)
+		if (ret1)
-			break;
+			ret2 = ret1;
 	}
 
-	return ret;
+	return ret2;
 }
 
 static int test_term(struct test__term *t)
@@ -1021,13 +1022,13 @@ static int test_pmu(void)
 
 int parse_events__test(void)
 {
-	int ret;
+	int ret1, ret2 = 0;
 
 #define TEST_EVENTS(tests)				\
 do {							\
-	ret = test_events(tests, ARRAY_SIZE(tests));	\
+	ret1 = test_events(tests, ARRAY_SIZE(tests));	\
-	if (ret)					\
+	if (!ret2)					\
-		return ret;				\
+		ret2 = ret1;				\
 } while (0)
 
 	TEST_EVENTS(test__events);
@@ -1035,5 +1036,9 @@ do {							\
 	if (test_pmu())
 		TEST_EVENTS(test__events_pmu);
 
-	return test_terms(test__terms, ARRAY_SIZE(test__terms));
+	ret1 = test_terms(test__terms, ARRAY_SIZE(test__terms));
+	if (!ret2)
+		ret2 = ret1;
+
+	return ret2;
 }

tools/perf/util/parse-events.c

@@ -751,6 +751,18 @@ int parse_events__modifier_event(struct list_head *list, char *str, bool add)
 	return 0;
 }
 
+int parse_events_name(struct list_head *list, char *name)
+{
+	struct perf_evsel *evsel;
+
+	list_for_each_entry(evsel, list, node) {
+		if (!evsel->name)
+			evsel->name = strdup(name);
+	}
+
+	return 0;
+}
+
 static int parse_events__scanner(const char *str, void *data, int start_token)
 {
 	YY_BUFFER_STATE buffer;

tools/perf/util/parse-events.h

@@ -81,6 +81,7 @@ int parse_events__term_clone(struct parse_events__term **new,
 void parse_events__free_terms(struct list_head *terms);
 int parse_events__modifier_event(struct list_head *list, char *str, bool add);
 int parse_events__modifier_group(struct list_head *list, char *event_mod);
+int parse_events_name(struct list_head *list, char *name);
 int parse_events_add_tracepoint(struct list_head **list, int *idx,
 				char *sys, char *event);
 int parse_events_add_numeric(struct list_head **list, int *idx,

tools/perf/util/parse-events.l

@@ -70,6 +70,12 @@ static int term(yyscan_t scanner, int type)
 %}
 
 %x mem
+%s config
+%x event
+
+group		[^,{}/]*[{][^}]*[}][^,{}/]*
+event_pmu	[^,{}/]+[/][^/]*[/][^,{}/]*
+event		[^,{}/]+
 
 num_dec		[0-9]+
 num_hex		0x[a-fA-F0-9]+
@@ -84,7 +90,13 @@ modifier_bp	[rwx]{1,3}
 	{
 		int start_token;
 
-		start_token = (int) parse_events_get_extra(yyscanner);
+		start_token = parse_events_get_extra(yyscanner);
+
+		if (start_token == PE_START_TERMS)
+			BEGIN(config);
+		else if (start_token == PE_START_EVENTS)
+			BEGIN(event);
+
 		if (start_token) {
 			parse_events_set_extra(NULL, yyscanner);
 			return start_token;
@@ -92,6 +104,26 @@ modifier_bp	[rwx]{1,3}
          }
 %}
 
+<event>{
+
+{group}		{
+			BEGIN(INITIAL); yyless(0);
+		}
+
+{event_pmu}	|
+{event}		{
+			str(yyscanner, PE_EVENT_NAME);
+			BEGIN(INITIAL); yyless(0);
+			return PE_EVENT_NAME;
+		}
+
+.		|
+<<EOF>>		{
+			BEGIN(INITIAL); yyless(0);
+		}
+
+}
+
 cpu-cycles|cycles				{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES); }
 stalled-cycles-frontend|idle-cycles-frontend	{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND); }
 stalled-cycles-backend|idle-cycles-backend	{ return sym(yyscanner, PERF_TYPE_HARDWARE, PERF_COUNT_HW_STALLED_CYCLES_BACKEND); }
@@ -127,18 +159,16 @@ speculative-read|speculative-load	|
 refs|Reference|ops|access		|
 misses|miss				{ return str(yyscanner, PE_NAME_CACHE_OP_RESULT); }
 
-	/*
+<config>{
-	 * These are event config hardcoded term names to be specified
-	 * within xxx/.../ syntax. So far we dont clash with other names,
-	 * so we can put them here directly. In case the we have a conflict
-	 * in future, this needs to go into '//' condition block.
-	 */
 config			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_CONFIG); }
 config1			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_CONFIG1); }
 config2			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_CONFIG2); }
 name			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NAME); }
 period			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD); }
 branch_type		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE); }
+,			{ return ','; }
+"/"			{ BEGIN(INITIAL); return '/'; }
+}
 
 mem:			{ BEGIN(mem); return PE_PREFIX_MEM; }
 r{num_raw_hex}		{ return raw(yyscanner); }
@@ -147,11 +177,11 @@ r{num_raw_hex}		{ return raw(yyscanner); }
 
 {modifier_event}	{ return str(yyscanner, PE_MODIFIER_EVENT); }
 {name}			{ return str(yyscanner, PE_NAME); }
-"/"			{ return '/'; }
+"/"			{ BEGIN(config); return '/'; }
 -			{ return '-'; }
-,			{ return ','; }
+,			{ BEGIN(event); return ','; }
 :			{ return ':'; }
-"{"			{ return '{'; }
+"{"			{ BEGIN(event); return '{'; }
 "}"			{ return '}'; }
 =			{ return '='; }
 \n			{ }

tools/perf/util/parse-events.y

@@ -27,6 +27,7 @@ do { \
 
 %token PE_START_EVENTS PE_START_TERMS
 %token PE_VALUE PE_VALUE_SYM_HW PE_VALUE_SYM_SW PE_RAW PE_TERM
+%token PE_EVENT_NAME
 %token PE_NAME
 %token PE_MODIFIER_EVENT PE_MODIFIER_BP
 %token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT
@@ -42,6 +43,7 @@ do { \
 %type <str> PE_NAME_CACHE_OP_RESULT
 %type <str> PE_MODIFIER_EVENT
 %type <str> PE_MODIFIER_BP
+%type <str> PE_EVENT_NAME
 %type <num> value_sym
 %type <head> event_config
 %type <term> event_term
@@ -53,6 +55,8 @@ do { \
 %type <head> event_legacy_numeric
 %type <head> event_legacy_raw
 %type <head> event_def
+%type <head> event_mod
+%type <head> event_name
 %type <head> event
 %type <head> events
 %type <head> group_def
@@ -143,8 +147,10 @@ events ',' event
 |
 event
 
-event:
+event: event_mod
-event_def PE_MODIFIER_EVENT
+
+event_mod:
+event_name PE_MODIFIER_EVENT
 {
 	struct list_head *list = $1;
 
@@ -157,6 +163,16 @@ event_def PE_MODIFIER_EVENT
 	$$ = list;
 }
 |
+event_name
+
+event_name:
+PE_EVENT_NAME event_def
+{
+	ABORT_ON(parse_events_name($2, $1));
+	free($1);
+	$$ = $2;
+}
+|
 event_def
 
 event_def: event_pmu |

tools/perf/util/pmu.c

@@ -10,6 +10,8 @@
 #include "pmu.h"
 #include "parse-events.h"
 
+#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
+
 int perf_pmu_parse(struct list_head *list, char *name);
 extern FILE *perf_pmu_in;
 
@@ -69,7 +71,7 @@ static int pmu_format(char *name, struct list_head *format)
 		return -1;
 
 	snprintf(path, PATH_MAX,
-		 "%s/bus/event_source/devices/%s/format", sysfs, name);
+		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
 
 	if (stat(path, &st) < 0)
 		return 0;	/* no error if format does not exist */
@@ -206,7 +208,7 @@ static int pmu_type(char *name, __u32 *type)
 		return -1;
 
 	snprintf(path, PATH_MAX,
-		 "%s/bus/event_source/devices/%s/type", sysfs, name);
+		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 
 	if (stat(path, &st) < 0)
 		return -1;
@@ -222,6 +224,35 @@ static int pmu_type(char *name, __u32 *type)
 	return ret;
 }
 
+/* Add all pmus in sysfs to pmu list: */
+static void pmu_read_sysfs(void)
+{
+	char path[PATH_MAX];
+	const char *sysfs;
+	DIR *dir;
+	struct dirent *dent;
+
+	sysfs = sysfs_find_mountpoint();
+	if (!sysfs)
+		return;
+
+	snprintf(path, PATH_MAX,
+		 "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
+
+	dir = opendir(path);
+	if (!dir)
+		return;
+
+	while ((dent = readdir(dir))) {
+		if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
+			continue;
+		/* add to static LIST_HEAD(pmus): */
+		perf_pmu__find(dent->d_name);
+	}
+
+	closedir(dir);
+}
+
 static struct perf_pmu *pmu_lookup(char *name)
 {
 	struct perf_pmu *pmu;
@@ -267,6 +298,21 @@ static struct perf_pmu *pmu_find(char *name)
 	return NULL;
 }
 
+struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
+{
+	/*
+	 * pmu iterator: If pmu is NULL, we start at the begin,
+	 * otherwise return the next pmu. Returns NULL on end.
+	 */
+	if (!pmu) {
+		pmu_read_sysfs();
+		pmu = list_prepare_entry(pmu, &pmus, list);
+	}
+	list_for_each_entry_continue(pmu, &pmus, list)
+		return pmu;
+	return NULL;
+}
+
 struct perf_pmu *perf_pmu__find(char *name)
 {
 	struct perf_pmu *pmu;

tools/perf/util/pmu.h

@@ -46,5 +46,7 @@ int perf_pmu__new_format(struct list_head *list, char *name,
 			 int config, unsigned long *bits);
 void perf_pmu__set_format(unsigned long *bits, long from, long to);
 
+struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu);
+
 int perf_pmu__test(void);
 #endif /* __PMU_H */