10 files changed, 366 insertions, 74 deletions

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 6bd888d04b6e..722ddee61f9f 100644
--- a/tools/perf/Makefile
+++ b/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
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 1e5b6aa60523..9696e64c9dbd 100644
--- a/tools/perf/util/header.c
+++ b/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;
 
@@ -1004,6 +1005,45 @@ done:
 }
 
 /*
+ * 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_evsel *evsel;
+
+        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_event_attr attr;
-        uint64_t id;
+        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);
-                fprintf(fp, "# event : name = %s, ", str);
-                free(str);
+                evsel->name = do_read_string(fd, ph);
+
+                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,
-                                (u64)attr.config,
-                                (u64)attr.config1,
-                                (u64)attr.config2);
+                                evsel->attr.type,
+                                (u64)evsel->attr.config,
+                                (u64)evsel->attr.config1,
+                                (u64)evsel->attr.config2);
 
                 fprintf(fp, ", excl_usr = %d, excl_kern = %d",
-                                attr.exclude_user,
-                                attr.exclude_kernel);
+                                evsel->attr.exclude_user,
+                                evsel->attr.exclude_kernel);
 
                 fprintf(fp, ", excl_host = %d, excl_guest = %d",
-                                attr.exclude_host,
-                                attr.exclude_guest);
+                                evsel->attr.exclude_host,
+                                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 ; 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);
-
-                        if (j)
-                                fputc(',', fp);
-
-                        fprintf(fp, " %"PRIu64, id);
-                }
-                if (nr && j == nr)
+                        for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
+                                if (j)
+                                        fputc(',', fp);
+                                fprintf(fp, " %"PRIu64, *id);
+                        }
                         fprintf(fp, " }");
+                }
+
                 fputc('\n', fp);
         }
-        free(buf);
-        return;
-error:
-        fprintf(fp, "# event desc: not available or unable to read\n");
+
+        free_event_desc(events);
 }
 
 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,
 };
 
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 24962e707e5b..9d5eedceda72 100644
--- a/tools/perf/util/header.h
+++ b/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,
 };
diff --git a/tools/perf/util/parse-events-test.c b/tools/perf/util/parse-events-test.c
index bf055ce1916e..bc8b65130ae0 100644
--- a/tools/perf/util/parse-events-test.c
+++ b/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);
-                if (ret)
-                        break;
+                ret1 = test_event(e);
+                if (ret1)
+                        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));    \
-        if (ret)                                        \
-                return ret;                             \
+        ret1 = test_events(tests, ARRAY_SIZE(tests));   \
+        if (!ret2)                                      \
+                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;
 }
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 925784a930a8..b24630398b92 100644
--- a/tools/perf/util/parse-events.c
+++ b/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;
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 0b9782dc3da2..c356e443448d 100644
--- a/tools/perf/util/parse-events.h
+++ b/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,
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 2c0d006d43db..f5e28dc68270 100644
--- a/tools/perf/util/parse-events.l
+++ b/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); }
 
-        /*
-         * 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>{
 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                      { }
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 66850f820df9..42d9a17b83b1 100644
--- a/tools/perf/util/parse-events.y
+++ b/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_def PE_MODIFIER_EVENT
+event: event_mod
+
+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 |
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 67715a42cd6d..6631d828db3d 100644
--- a/tools/perf/util/pmu.c
+++ b/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;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 535f2c5258ab..47f68d3cc5d1 100644
--- a/tools/perf/util/pmu.h
+++ b/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 */