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-rw-r--r--kernel/events/core.c46
1 files changed, 39 insertions, 7 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 00a014670ed0..2cba42957b35 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5029,6 +5029,24 @@ static void _perf_event_reset(struct perf_event *event)
perf_event_update_userpage(event);
}
+/* Assume it's not an event with inherit set. */
+u64 perf_event_pause(struct perf_event *event, bool reset)
+{
+ struct perf_event_context *ctx;
+ u64 count;
+
+ ctx = perf_event_ctx_lock(event);
+ WARN_ON_ONCE(event->attr.inherit);
+ _perf_event_disable(event);
+ count = local64_read(&event->count);
+ if (reset)
+ local64_set(&event->count, 0);
+ perf_event_ctx_unlock(event, ctx);
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(perf_event_pause);
+
/*
* Holding the top-level event's child_mutex means that any
* descendant process that has inherited this event will block
@@ -5106,16 +5124,11 @@ static int perf_event_check_period(struct perf_event *event, u64 value)
return event->pmu->check_period(event, value);
}
-static int perf_event_period(struct perf_event *event, u64 __user *arg)
+static int _perf_event_period(struct perf_event *event, u64 value)
{
- u64 value;
-
if (!is_sampling_event(event))
return -EINVAL;
- if (copy_from_user(&value, arg, sizeof(value)))
- return -EFAULT;
-
if (!value)
return -EINVAL;
@@ -5133,6 +5146,19 @@ static int perf_event_period(struct perf_event *event, u64 __user *arg)
return 0;
}
+int perf_event_period(struct perf_event *event, u64 value)
+{
+ struct perf_event_context *ctx;
+ int ret;
+
+ ctx = perf_event_ctx_lock(event);
+ ret = _perf_event_period(event, value);
+ perf_event_ctx_unlock(event, ctx);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(perf_event_period);
+
static const struct file_operations perf_fops;
static inline int perf_fget_light(int fd, struct fd *p)
@@ -5176,8 +5202,14 @@ static long _perf_ioctl(struct perf_event *event, unsigned int cmd, unsigned lon
return _perf_event_refresh(event, arg);
case PERF_EVENT_IOC_PERIOD:
- return perf_event_period(event, (u64 __user *)arg);
+ {
+ u64 value;
+ if (copy_from_user(&value, (u64 __user *)arg, sizeof(value)))
+ return -EFAULT;
+
+ return _perf_event_period(event, value);
+ }
case PERF_EVENT_IOC_ID:
{
u64 id = primary_event_id(event);