Merge branch 'perf/live' into perf/core

Conflicts:
	tools/perf/builtin-record.c

Merge reason: add the live tracing feature, resolve conflict.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 336 insertions, 25 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 6c9aa16ee51f..628173ba689e 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -99,13 +99,6 @@ int perf_header__add_attr(struct perf_header *self,
         return 0;
 }
 
-#define MAX_EVENT_NAME 64
-
-struct perf_trace_event_type {
-        u64     event_id;
-        char    name[MAX_EVENT_NAME];
-};
-
 static int event_count;
 static struct perf_trace_event_type *events;
 
@@ -427,6 +420,25 @@ out_free:
         return err;
 }
 
+int perf_header__write_pipe(int fd)
+{
+        struct perf_pipe_file_header f_header;
+        int err;
+
+        f_header = (struct perf_pipe_file_header){
+                .magic     = PERF_MAGIC,
+                .size      = sizeof(f_header),
+        };
+
+        err = do_write(fd, &f_header, sizeof(f_header));
+        if (err < 0) {
+                pr_debug("failed to write perf pipe header\n");
+                return err;
+        }
+
+        return 0;
+}
+
 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
 {
         struct perf_file_header f_header;
@@ -518,25 +530,10 @@ int perf_header__write(struct perf_header *self, int fd, bool at_exit)
         return 0;
 }
 
-static int do_read(int fd, void *buf, size_t size)
-{
-        while (size) {
-                int ret = read(fd, buf, size);
-
-                if (ret <= 0)
-                        return -1;
-
-                size -= ret;
-                buf += ret;
-        }
-
-        return 0;
-}
-
 static int perf_header__getbuffer64(struct perf_header *self,
                                     int fd, void *buf, size_t size)
 {
-        if (do_read(fd, buf, size))
+        if (do_read(fd, buf, size) <= 0)
                 return -1;
 
         if (self->needs_swap)
@@ -592,7 +589,7 @@ int perf_file_header__read(struct perf_file_header *self,
 {
         lseek(fd, 0, SEEK_SET);
 
-        if (do_read(fd, self, sizeof(*self)) ||
+        if (do_read(fd, self, sizeof(*self)) <= 0 ||
             memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
                 return -1;
 
@@ -662,13 +659,51 @@ static int perf_file_section__process(struct perf_file_section *self,
         return 0;
 }
 
-int perf_header__read(struct perf_header *self, int fd)
+static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
+                                       struct perf_header *ph, int fd)
+{
+        if (do_read(fd, self, sizeof(*self)) <= 0 ||
+            memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
+                return -1;
+
+        if (self->size != sizeof(*self)) {
+                u64 size = bswap_64(self->size);
+
+                if (size != sizeof(*self))
+                        return -1;
+
+                ph->needs_swap = true;
+        }
+
+        return 0;
+}
+
+static int perf_header__read_pipe(struct perf_session *session, int fd)
+{
+        struct perf_header *self = &session->header;
+        struct perf_pipe_file_header f_header;
+
+        if (perf_file_header__read_pipe(&f_header, self, fd) < 0) {
+                pr_debug("incompatible file format\n");
+                return -EINVAL;
+        }
+
+        session->fd = fd;
+
+        return 0;
+}
+
+int perf_header__read(struct perf_session *session, int fd)
 {
+        struct perf_header *self = &session->header;
         struct perf_file_header f_header;
         struct perf_file_attr   f_attr;
         u64                     f_id;
         int nr_attrs, nr_ids, i, j;
 
+        if (session->fd_pipe)
+                return perf_header__read_pipe(session, fd);
+
         if (perf_file_header__read(&f_header, self, fd) < 0) {
                 pr_debug("incompatible file format\n");
                 return -EINVAL;
@@ -765,3 +800,279 @@ perf_header__find_attr(u64 id, struct perf_header *header)
 
         return NULL;
 }
+
+int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
+                           event__handler_t process,
+                           struct perf_session *session)
+{
+        event_t *ev;
+        size_t size;
+        int err;
+
+        size = sizeof(struct perf_event_attr);
+        size = ALIGN(size, sizeof(u64));
+        size += sizeof(struct perf_event_header);
+        size += ids * sizeof(u64);
+
+        ev = malloc(size);
+
+        ev->attr.attr = *attr;
+        memcpy(ev->attr.id, id, ids * sizeof(u64));
+
+        ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
+        ev->attr.header.size = size;
+
+        err = process(ev, session);
+
+        free(ev);
+
+        return err;
+}
+
+int event__synthesize_attrs(struct perf_header *self,
+                            event__handler_t process,
+                            struct perf_session *session)
+{
+        struct perf_header_attr *attr;
+        int i, err = 0;
+
+        for (i = 0; i < self->attrs; i++) {
+                attr = self->attr[i];
+
+                err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,
+                                             process, session);
+                if (err) {
+                        pr_debug("failed to create perf header attribute\n");
+                        return err;
+                }
+        }
+
+        return err;
+}
+
+int event__process_attr(event_t *self, struct perf_session *session)
+{
+        struct perf_header_attr *attr;
+        unsigned int i, ids, n_ids;
+
+        attr = perf_header_attr__new(&self->attr.attr);
+        if (attr == NULL)
+                return -ENOMEM;
+
+        ids = self->header.size;
+        ids -= (void *)&self->attr.id - (void *)self;
+        n_ids = ids / sizeof(u64);
+
+        for (i = 0; i < n_ids; i++) {
+                if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {
+                        perf_header_attr__delete(attr);
+                        return -ENOMEM;
+                }
+        }
+
+        if (perf_header__add_attr(&session->header, attr) < 0) {
+                perf_header_attr__delete(attr);
+                return -ENOMEM;
+        }
+
+        perf_session__update_sample_type(session);
+
+        return 0;
+}
+
+int event__synthesize_event_type(u64 event_id, char *name,
+                                 event__handler_t process,
+                                 struct perf_session *session)
+{
+        event_t ev;
+        size_t size = 0;
+        int err = 0;
+
+        memset(&ev, 0, sizeof(ev));
+
+        ev.event_type.event_type.event_id = event_id;
+        memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
+        strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
+
+        ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
+        size = strlen(name);
+        size = ALIGN(size, sizeof(u64));
+        ev.event_type.header.size = sizeof(ev.event_type) -
+                (sizeof(ev.event_type.event_type.name) - size);
+
+        err = process(&ev, session);
+
+        return err;
+}
+
+int event__synthesize_event_types(event__handler_t process,
+                                  struct perf_session *session)
+{
+        struct perf_trace_event_type *type;
+        int i, err = 0;
+
+        for (i = 0; i < event_count; i++) {
+                type = &events[i];
+
+                err = event__synthesize_event_type(type->event_id, type->name,
+                                                   process, session);
+                if (err) {
+                        pr_debug("failed to create perf header event type\n");
+                        return err;
+                }
+        }
+
+        return err;
+}
+
+int event__process_event_type(event_t *self,
+                              struct perf_session *session __unused)
+{
+        if (perf_header__push_event(self->event_type.event_type.event_id,
+                                    self->event_type.event_type.name) < 0)
+                return -ENOMEM;
+
+        return 0;
+}
+
+int event__synthesize_tracing_data(int fd, struct perf_event_attr *pattrs,
+                                   int nb_events,
+                                   event__handler_t process,
+                                   struct perf_session *session __unused)
+{
+        event_t ev;
+        ssize_t size = 0, aligned_size = 0, padding;
+        int err = 0;
+
+        memset(&ev, 0, sizeof(ev));
+
+        ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
+        size = read_tracing_data_size(fd, pattrs, nb_events);
+        if (size <= 0)
+                return size;
+        aligned_size = ALIGN(size, sizeof(u64));
+        padding = aligned_size - size;
+        ev.tracing_data.header.size = sizeof(ev.tracing_data);
+        ev.tracing_data.size = aligned_size;
+
+        process(&ev, session);
+
+        err = read_tracing_data(fd, pattrs, nb_events);
+        write_padded(fd, NULL, 0, padding);
+
+        return aligned_size;
+}
+
+int event__process_tracing_data(event_t *self,
+                                struct perf_session *session)
+{
+        ssize_t size_read, padding, size = self->tracing_data.size;
+        off_t offset = lseek(session->fd, 0, SEEK_CUR);
+        char buf[BUFSIZ];
+
+        /* setup for reading amidst mmap */
+        lseek(session->fd, offset + sizeof(struct tracing_data_event),
+              SEEK_SET);
+
+        size_read = trace_report(session->fd);
+
+        padding = ALIGN(size_read, sizeof(u64)) - size_read;
+
+        if (read(session->fd, buf, padding) < 0)
+                die("reading input file");
+
+        if (size_read + padding != size)
+                die("tracing data size mismatch");
+
+        return size_read + padding;
+}
+
+int event__synthesize_build_id(struct dso *pos, u16 misc,
+                               event__handler_t process,
+                               struct perf_session *session)
+{
+        event_t ev;
+        size_t len;
+        int err = 0;
+
+        if (!pos->hit)
+                return err;
+
+        memset(&ev, 0, sizeof(ev));
+
+        len = pos->long_name_len + 1;
+        len = ALIGN(len, NAME_ALIGN);
+        memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
+        ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
+        ev.build_id.header.misc = misc;
+        ev.build_id.header.size = sizeof(ev.build_id) + len;
+        memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
+
+        err = process(&ev, session);
+
+        return err;
+}
+
+static int __event_synthesize_build_ids(struct list_head *head, u16 misc,
+                                        event__handler_t process,
+                                        struct perf_session *session)
+{
+        struct dso *pos;
+
+        dsos__for_each_with_build_id(pos, head) {
+                int err;
+                if (!pos->hit)
+                        continue;
+
+                err = event__synthesize_build_id(pos, misc, process, session);
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
+}
+
+int event__synthesize_build_ids(event__handler_t process,
+                                struct perf_session *session)
+{
+        int err;
+
+        if (!dsos__read_build_ids(true))
+                return 0;
+
+        err = __event_synthesize_build_ids(&dsos__kernel,
+                                           PERF_RECORD_MISC_KERNEL,
+                                           process, session);
+        if (err == 0)
+                err = __event_synthesize_build_ids(&dsos__user,
+                                                   PERF_RECORD_MISC_USER,
+                                                   process, session);
+
+        if (err < 0) {
+                pr_debug("failed to synthesize build ids\n");
+                return err;
+        }
+
+        dsos__cache_build_ids();
+
+        return 0;
+}
+
+int event__process_build_id(event_t *self,
+                            struct perf_session *session __unused)
+{
+        struct list_head *head = &dsos__user;
+        struct dso *dso;
+
+        if (self->build_id.header.misc & PERF_RECORD_MISC_KERNEL)
+                head = &dsos__kernel;
+
+        dso = __dsos__findnew(head, self->build_id.filename);
+        if (dso != NULL) {
+                dso__set_build_id(dso, &self->build_id.build_id);
+                if (head == &dsos__kernel && self->build_id.filename[0] == '[')
+                        dso->kernel = 1;
+        }
+
+        return 0;
+}