void __weak hw_perf_disable(void) { barrier(); }
void __weak hw_perf_enable(void) { barrier(); }
-int __weak
-hw_perf_group_sched_in(struct perf_event *group_leader,
- struct perf_cpu_context *cpuctx,
- struct perf_event_context *ctx)
-{
- return 0;
-}
-
void __weak perf_event_print_debug(void) { }
static DEFINE_PER_CPU(int, perf_disable_count);
event->total_time_running = run_end - event->tstamp_running;
}
+/*
+ * Update total_time_enabled and total_time_running for all events in a group.
+ */
+static void update_group_times(struct perf_event *leader)
+{
+ struct perf_event *event;
+
+ update_event_times(leader);
+ list_for_each_entry(event, &leader->sibling_list, group_entry)
+ update_event_times(event);
+}
+
static struct list_head *
ctx_group_list(struct perf_event *event, struct perf_event_context *ctx)
{
static void
list_del_event(struct perf_event *event, struct perf_event_context *ctx)
{
- struct perf_event *sibling, *tmp;
-
if (list_empty(&event->group_entry))
return;
ctx->nr_events--;
if (event->group_leader != event)
event->group_leader->nr_siblings--;
- update_event_times(event);
+ update_group_times(event);
/*
* If event was in error state, then keep it
*/
if (event->state > PERF_EVENT_STATE_OFF)
event->state = PERF_EVENT_STATE_OFF;
+}
+
+static void
+perf_destroy_group(struct perf_event *event, struct perf_event_context *ctx)
+{
+ struct perf_event *sibling, *tmp;
/*
* If this was a group event with sibling events then
}
/*
- * Update total_time_enabled and total_time_running for all events in a group.
- */
-static void update_group_times(struct perf_event *leader)
-{
- struct perf_event *event;
-
- update_event_times(leader);
- list_for_each_entry(event, &leader->sibling_list, group_entry)
- update_event_times(event);
-}
-
-/*
* Cross CPU call to disable a performance event
*/
static void __perf_event_disable(void *info)
struct perf_cpu_context *cpuctx,
struct perf_event_context *ctx)
{
- struct perf_event *event, *partial_group;
+ struct perf_event *event, *partial_group = NULL;
+ const struct pmu *pmu = group_event->pmu;
+ bool txn = false;
int ret;
if (group_event->state == PERF_EVENT_STATE_OFF)
return 0;
- ret = hw_perf_group_sched_in(group_event, cpuctx, ctx);
- if (ret)
- return ret < 0 ? ret : 0;
+ /* Check if group transaction availabe */
+ if (pmu->start_txn)
+ txn = true;
+
+ if (txn)
+ pmu->start_txn(pmu);
if (event_sched_in(group_event, cpuctx, ctx))
return -EAGAIN;
}
}
- return 0;
+ if (!txn)
+ return 0;
+
+ ret = pmu->commit_txn(pmu);
+ if (!ret) {
+ pmu->cancel_txn(pmu);
+ return 0;
+ }
group_error:
+ if (txn)
+ pmu->cancel_txn(pmu);
+
/*
* Groups can be scheduled in as one unit only, so undo any
* partial group before returning:
{
struct perf_event_context *ctx = event->ctx;
+ /*
+ * Remove from the PMU, can't get re-enabled since we got
+ * here because the last ref went.
+ */
+ perf_event_disable(event);
+
WARN_ON_ONCE(ctx->parent_ctx);
- mutex_lock(&ctx->mutex);
- perf_event_remove_from_context(event);
+ /*
+ * There are two ways this annotation is useful:
+ *
+ * 1) there is a lock recursion from perf_event_exit_task
+ * see the comment there.
+ *
+ * 2) there is a lock-inversion with mmap_sem through
+ * perf_event_read_group(), which takes faults while
+ * holding ctx->mutex, however this is called after
+ * the last filedesc died, so there is no possibility
+ * to trigger the AB-BA case.
+ */
+ mutex_lock_nested(&ctx->mutex, SINGLE_DEPTH_NESTING);
+ raw_spin_lock_irq(&ctx->lock);
+ list_del_event(event, ctx);
+ perf_destroy_group(event, ctx);
+ raw_spin_unlock_irq(&ctx->lock);
mutex_unlock(&ctx->mutex);
mutex_lock(&event->owner->perf_event_mutex);
/*
+ * We assume there is only KVM supporting the callbacks.
+ * Later on, we might change it to a list if there is
+ * another virtualization implementation supporting the callbacks.
+ */
+struct perf_guest_info_callbacks *perf_guest_cbs;
+
+int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
+{
+ perf_guest_cbs = cbs;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks);
+
+int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
+{
+ perf_guest_cbs = NULL;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);
+
+/*
* Output
*/
static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
.event_id = {
.header = {
.type = PERF_RECORD_MMAP,
- .misc = 0,
+ .misc = PERF_RECORD_MISC_USER,
/* .size */
},
/* .pid */
.read = task_clock_perf_event_read,
};
-#ifdef CONFIG_EVENT_TRACING
-
-void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
- int entry_size, struct pt_regs *regs)
-{
- struct perf_sample_data data;
- struct perf_raw_record raw = {
- .size = entry_size,
- .data = record,
- };
-
- perf_sample_data_init(&data, addr);
- data.raw = &raw;
-
- /* Trace events already protected against recursion */
- do_perf_sw_event(PERF_TYPE_TRACEPOINT, event_id, count, 1,
- &data, regs);
-}
-EXPORT_SYMBOL_GPL(perf_tp_event);
-
-static int perf_tp_event_match(struct perf_event *event,
- struct perf_sample_data *data)
-{
- void *record = data->raw->data;
-
- if (likely(!event->filter) || filter_match_preds(event->filter, record))
- return 1;
- return 0;
-}
-
static void swevent_hlist_release_rcu(struct rcu_head *rcu_head)
{
struct swevent_hlist *hlist;
return err;
}
+#ifdef CONFIG_EVENT_TRACING
+
+void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
+ int entry_size, struct pt_regs *regs)
+{
+ struct perf_sample_data data;
+ struct perf_raw_record raw = {
+ .size = entry_size,
+ .data = record,
+ };
+
+ perf_sample_data_init(&data, addr);
+ data.raw = &raw;
+
+ /* Trace events already protected against recursion */
+ do_perf_sw_event(PERF_TYPE_TRACEPOINT, event_id, count, 1,
+ &data, regs);
+}
+EXPORT_SYMBOL_GPL(perf_tp_event);
+
+static int perf_tp_event_match(struct perf_event *event,
+ struct perf_sample_data *data)
+{
+ void *record = data->raw->data;
+
+ if (likely(!event->filter) || filter_match_preds(event->filter, record))
+ return 1;
+ return 0;
+}
+
static void tp_perf_event_destroy(struct perf_event *event)
{
perf_trace_disable(event->attr.config);
err_free_put_context:
if (err < 0)
- kfree(event);
+ free_event(event);
err_put_context:
if (err < 0)
*
* But since its the parent context it won't be the same instance.
*/
- mutex_lock_nested(&child_ctx->mutex, SINGLE_DEPTH_NESTING);
+ mutex_lock(&child_ctx->mutex);
again:
list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff