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-rw-r--r--tools/perf/util/evlist.c183
1 files changed, 161 insertions, 22 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index ab48be4cf258..e3fa3bf7498a 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -63,6 +63,9 @@ void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
perf_evlist__set_maps(&evlist->core, cpus, threads);
evlist->workload.pid = -1;
evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
+ evlist->ctl_fd.fd = -1;
+ evlist->ctl_fd.ack = -1;
+ evlist->ctl_fd.pos = -1;
}
struct evlist *evlist__new(void)
@@ -79,7 +82,7 @@ struct evlist *perf_evlist__new_default(void)
{
struct evlist *evlist = evlist__new();
- if (evlist && perf_evlist__add_default(evlist)) {
+ if (evlist && evlist__add_default(evlist)) {
evlist__delete(evlist);
evlist = NULL;
}
@@ -91,7 +94,7 @@ struct evlist *perf_evlist__new_dummy(void)
{
struct evlist *evlist = evlist__new();
- if (evlist && perf_evlist__add_dummy(evlist)) {
+ if (evlist && evlist__add_dummy(evlist)) {
evlist__delete(evlist);
evlist = NULL;
}
@@ -231,7 +234,7 @@ void perf_evlist__set_leader(struct evlist *evlist)
}
}
-int __perf_evlist__add_default(struct evlist *evlist, bool precise)
+int __evlist__add_default(struct evlist *evlist, bool precise)
{
struct evsel *evsel = evsel__new_cycles(precise);
@@ -242,7 +245,7 @@ int __perf_evlist__add_default(struct evlist *evlist, bool precise)
return 0;
}
-int perf_evlist__add_dummy(struct evlist *evlist)
+int evlist__add_dummy(struct evlist *evlist)
{
struct perf_event_attr attr = {
.type = PERF_TYPE_SOFTWARE,
@@ -258,8 +261,7 @@ int perf_evlist__add_dummy(struct evlist *evlist)
return 0;
}
-static int evlist__add_attrs(struct evlist *evlist,
- struct perf_event_attr *attrs, size_t nr_attrs)
+static int evlist__add_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
{
struct evsel *evsel, *n;
LIST_HEAD(head);
@@ -282,8 +284,7 @@ out_delete_partial_list:
return -1;
}
-int __perf_evlist__add_default_attrs(struct evlist *evlist,
- struct perf_event_attr *attrs, size_t nr_attrs)
+int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs)
{
size_t i;
@@ -322,8 +323,7 @@ perf_evlist__find_tracepoint_by_name(struct evlist *evlist,
return NULL;
}
-int perf_evlist__add_newtp(struct evlist *evlist,
- const char *sys, const char *name, void *handler)
+int evlist__add_newtp(struct evlist *evlist, const char *sys, const char *name, void *handler)
{
struct evsel *evsel = evsel__newtp(sys, name);
@@ -500,7 +500,7 @@ int perf_evlist__enable_event_idx(struct evlist *evlist,
int evlist__add_pollfd(struct evlist *evlist, int fd)
{
- return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN);
+ return perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN, fdarray_flag__default);
}
int evlist__filter_pollfd(struct evlist *evlist, short revents_and_mask)
@@ -540,7 +540,7 @@ struct evsel *perf_evlist__id2evsel(struct evlist *evlist, u64 id)
if (sid)
return container_of(sid->evsel, struct evsel, core);
- if (!perf_evlist__sample_id_all(evlist))
+ if (!evlist__sample_id_all(evlist))
return evlist__first(evlist);
return NULL;
@@ -1088,7 +1088,7 @@ int perf_evlist__append_tp_filter_pid(struct evlist *evlist, pid_t pid)
return perf_evlist__append_tp_filter_pids(evlist, 1, &pid);
}
-bool perf_evlist__valid_sample_type(struct evlist *evlist)
+bool evlist__valid_sample_type(struct evlist *evlist)
{
struct evsel *pos;
@@ -1107,7 +1107,7 @@ bool perf_evlist__valid_sample_type(struct evlist *evlist)
return true;
}
-u64 __perf_evlist__combined_sample_type(struct evlist *evlist)
+u64 __evlist__combined_sample_type(struct evlist *evlist)
{
struct evsel *evsel;
@@ -1120,13 +1120,13 @@ u64 __perf_evlist__combined_sample_type(struct evlist *evlist)
return evlist->combined_sample_type;
}
-u64 perf_evlist__combined_sample_type(struct evlist *evlist)
+u64 evlist__combined_sample_type(struct evlist *evlist)
{
evlist->combined_sample_type = 0;
- return __perf_evlist__combined_sample_type(evlist);
+ return __evlist__combined_sample_type(evlist);
}
-u64 perf_evlist__combined_branch_type(struct evlist *evlist)
+u64 evlist__combined_branch_type(struct evlist *evlist)
{
struct evsel *evsel;
u64 branch_type = 0;
@@ -1191,7 +1191,7 @@ out:
return size;
}
-bool perf_evlist__valid_sample_id_all(struct evlist *evlist)
+bool evlist__valid_sample_id_all(struct evlist *evlist)
{
struct evsel *first = evlist__first(evlist), *pos = first;
@@ -1203,7 +1203,7 @@ bool perf_evlist__valid_sample_id_all(struct evlist *evlist)
return true;
}
-bool perf_evlist__sample_id_all(struct evlist *evlist)
+bool evlist__sample_id_all(struct evlist *evlist)
{
struct evsel *first = evlist__first(evlist);
return first->core.attr.sample_id_all;
@@ -1464,8 +1464,7 @@ int perf_evlist__parse_sample_timestamp(struct evlist *evlist,
return evsel__parse_sample_timestamp(evsel, event, timestamp);
}
-int perf_evlist__strerror_open(struct evlist *evlist,
- int err, char *buf, size_t size)
+int evlist__strerror_open(struct evlist *evlist, int err, char *buf, size_t size)
{
int printed, value;
char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
@@ -1518,7 +1517,7 @@ out_default:
return 0;
}
-int perf_evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
+int evlist__strerror_mmap(struct evlist *evlist, int err, char *buf, size_t size)
{
char sbuf[STRERR_BUFSIZE], *emsg = str_error_r(err, sbuf, sizeof(sbuf));
int pages_attempted = evlist->core.mmap_len / 1024, pages_max_per_user, printed = 0;
@@ -1727,3 +1726,143 @@ struct evsel *perf_evlist__reset_weak_group(struct evlist *evsel_list,
}
return leader;
}
+
+int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
+{
+ if (fd == -1) {
+ pr_debug("Control descriptor is not initialized\n");
+ return 0;
+ }
+
+ evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
+ fdarray_flag__nonfilterable);
+ if (evlist->ctl_fd.pos < 0) {
+ evlist->ctl_fd.pos = -1;
+ pr_err("Failed to add ctl fd entry: %m\n");
+ return -1;
+ }
+
+ evlist->ctl_fd.fd = fd;
+ evlist->ctl_fd.ack = ack;
+
+ return 0;
+}
+
+bool evlist__ctlfd_initialized(struct evlist *evlist)
+{
+ return evlist->ctl_fd.pos >= 0;
+}
+
+int evlist__finalize_ctlfd(struct evlist *evlist)
+{
+ struct pollfd *entries = evlist->core.pollfd.entries;
+
+ if (!evlist__ctlfd_initialized(evlist))
+ return 0;
+
+ entries[evlist->ctl_fd.pos].fd = -1;
+ entries[evlist->ctl_fd.pos].events = 0;
+ entries[evlist->ctl_fd.pos].revents = 0;
+
+ evlist->ctl_fd.pos = -1;
+ evlist->ctl_fd.ack = -1;
+ evlist->ctl_fd.fd = -1;
+
+ return 0;
+}
+
+static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
+ char *cmd_data, size_t data_size)
+{
+ int err;
+ char c;
+ size_t bytes_read = 0;
+
+ memset(cmd_data, 0, data_size);
+ data_size--;
+
+ do {
+ err = read(evlist->ctl_fd.fd, &c, 1);
+ if (err > 0) {
+ if (c == '\n' || c == '\0')
+ break;
+ cmd_data[bytes_read++] = c;
+ if (bytes_read == data_size)
+ break;
+ } else {
+ if (err == -1)
+ pr_err("Failed to read from ctlfd %d: %m\n", evlist->ctl_fd.fd);
+ break;
+ }
+ } while (1);
+
+ pr_debug("Message from ctl_fd: \"%s%s\"\n", cmd_data,
+ bytes_read == data_size ? "" : c == '\n' ? "\\n" : "\\0");
+
+ if (err > 0) {
+ if (!strncmp(cmd_data, EVLIST_CTL_CMD_ENABLE_TAG,
+ (sizeof(EVLIST_CTL_CMD_ENABLE_TAG)-1))) {
+ *cmd = EVLIST_CTL_CMD_ENABLE;
+ } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_DISABLE_TAG,
+ (sizeof(EVLIST_CTL_CMD_DISABLE_TAG)-1))) {
+ *cmd = EVLIST_CTL_CMD_DISABLE;
+ }
+ }
+
+ return err;
+}
+
+static int evlist__ctlfd_ack(struct evlist *evlist)
+{
+ int err;
+
+ if (evlist->ctl_fd.ack == -1)
+ return 0;
+
+ err = write(evlist->ctl_fd.ack, EVLIST_CTL_CMD_ACK_TAG,
+ sizeof(EVLIST_CTL_CMD_ACK_TAG));
+ if (err == -1)
+ pr_err("failed to write to ctl_ack_fd %d: %m\n", evlist->ctl_fd.ack);
+
+ return err;
+}
+
+int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
+{
+ int err = 0;
+ char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
+ int ctlfd_pos = evlist->ctl_fd.pos;
+ struct pollfd *entries = evlist->core.pollfd.entries;
+
+ if (!evlist__ctlfd_initialized(evlist) || !entries[ctlfd_pos].revents)
+ return 0;
+
+ if (entries[ctlfd_pos].revents & POLLIN) {
+ err = evlist__ctlfd_recv(evlist, cmd, cmd_data,
+ EVLIST_CTL_CMD_MAX_LEN);
+ if (err > 0) {
+ switch (*cmd) {
+ case EVLIST_CTL_CMD_ENABLE:
+ evlist__enable(evlist);
+ break;
+ case EVLIST_CTL_CMD_DISABLE:
+ evlist__disable(evlist);
+ break;
+ case EVLIST_CTL_CMD_ACK:
+ case EVLIST_CTL_CMD_UNSUPPORTED:
+ default:
+ pr_debug("ctlfd: unsupported %d\n", *cmd);
+ break;
+ }
+ if (!(*cmd == EVLIST_CTL_CMD_ACK || *cmd == EVLIST_CTL_CMD_UNSUPPORTED))
+ evlist__ctlfd_ack(evlist);
+ }
+ }
+
+ if (entries[ctlfd_pos].revents & (POLLHUP | POLLERR))
+ evlist__finalize_ctlfd(evlist);
+ else
+ entries[ctlfd_pos].revents = 0;
+
+ return err;
+}