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* [PATCH] drm/xe/oa: Ensure that polled read returns latest data
@ 2025-02-12  1:02 Umesh Nerlige Ramappa
  2025-02-12  1:08 ` ✓ CI.Patch_applied: success for " Patchwork
                   ` (8 more replies)
  0 siblings, 9 replies; 12+ messages in thread
From: Umesh Nerlige Ramappa @ 2025-02-12  1:02 UTC (permalink / raw)
  To: Ashutosh Dixit, intel-xe

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>
---
 drivers/gpu/drm/xe/xe_oa.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c
index fa873f3d0a9d..a692dffcb638 100644
--- a/drivers/gpu/drm/xe/xe_oa.c
+++ b/drivers/gpu/drm/xe/xe_oa.c
@@ -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);
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2025-02-21  1:38 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
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2025-02-12  1:02 [PATCH] drm/xe/oa: Ensure that polled read returns latest data Umesh Nerlige Ramappa
2025-02-12  1:08 ` ✓ CI.Patch_applied: success for " Patchwork
2025-02-12  1:08 ` ✓ CI.checkpatch: " Patchwork
2025-02-12  1:09 ` ✓ CI.KUnit: " Patchwork
2025-02-12  1:38 ` ✓ CI.Build: " Patchwork
2025-02-12  1:41 ` ✓ CI.Hooks: " Patchwork
2025-02-12  1:42 ` ✓ CI.checksparse: " Patchwork
2025-02-12  2:13 ` ✓ Xe.CI.BAT: " Patchwork
2025-02-12  2:27 ` [PATCH] " Dixit, Ashutosh
2025-02-12 16:20   ` Umesh Nerlige Ramappa
2025-02-12  7:28 ` ✗ Xe.CI.Full: failure for " Patchwork
2025-02-21  1:38   ` Umesh Nerlige Ramappa

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