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

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[ Upstream commit 98c9d27ab30aa9c6451d3a34e6e297171f273e51 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Umesh Nerlige Ramappa
2025-02-11 17:02:55 -08:00
committed by Greg Kroah-Hartman
parent 4d9fa2ebc0
commit 9058b48578
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/xe/xe_oa.c
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@@ -535,6 +535,7 @@ 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);