[PATCH 6.18 095/212] drm/xe/oa: Allow reading after disabling OA stream

Greg Kroah-Hartman
2026-03-23T14:05:42Z

From: Ashutosh Dixit <ashutosh.dixit@intel.com>

commit 9be6fd9fbd2032b683e51374497768af9aaa228a upstream.

Some OA data might be present in the OA buffer when OA stream is
disabled. Allow UMD's to retrieve this data, so that all data till the
point when OA stream is disabled can be retrieved.

v2: Update tail pointer after disable (Umesh)

Fixes: efb315d0a013 ("drm/xe/oa/uapi: Read file_operation")
Cc: stable@vger.kernel.org
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Umesh Nerlige Ramappa<umesh.nerlige.ramappa@intel.com>
Link: https://patch.msgid.link/20260313053630.3176100-1-ashutosh.dixit@intel.com
(cherry picked from commit 4ff57c5e8dbba23b5457be12f9709d5c016da16e)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/xe/xe_oa.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/xe/xe_oa.c
+++ b/drivers/gpu/drm/xe/xe_oa.c
@@ -543,8 +543,7 @@ static ssize_t xe_oa_read(struct file *f
size_t offset = 0;
int ret;

- /* Can't read from disabled streams */
- if (!stream->enabled || !stream->sample)
+ if (!stream->sample)
return -EINVAL;

if (!(file->f_flags & O_NONBLOCK)) {
@@ -1459,6 +1458,10 @@ static void xe_oa_stream_disable(struct

if (stream->sample)
hrtimer_cancel(&stream->poll_check_timer);
+
+ /* Update stream->oa_buffer.tail to allow any final reports to be read */
+ if (xe_oa_buffer_check_unlocked(stream))
+ wake_up(&stream->poll_wq);
}

static int xe_oa_enable_preempt_timeslice(struct xe_oa_stream *stream)