Commit 98c9d27a authored Feb 11, 2025 by Umesh Nerlige Ramappa

drm/xe/oa: Ensure that polled read returns latest data

In polled mode, user calls poll() for read data to be available before
performing a read(). In the duration between these 2 calls, there may be
new data available in the OA buffer. To ensure user reads all available
data, check for latest data in the OA buffer in polled read.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250212010255.1423343-1-umesh.nerlige.ramappa@intel.com

parent 70c72737

drivers/gpu/drm/xe/xe_oa.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -548,6 +548,7 @@ static ssize_t xe_oa_read(struct file file, char __user buf,
		mutex_unlock(&stream->stream_lock);
		} while (!offset && !ret);
		} else {
		xe_oa_buffer_check_unlocked(stream);
		mutex_lock(&stream->stream_lock);
		ret = __xe_oa_read(stream, buf, count, &offset);
		mutex_unlock(&stream->stream_lock);