linux-kernel - [PATCH v6 2/3] drm/doc: Add a section about "Task information" for the wedge API

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Message-ID: <20250521153323.935974-3-andrealmeid@igalia.com>
Date: Wed, 21 May 2025 12:33:22 -0300
From: André Almeida <andrealmeid@...lia.com>
To: "Alex Deucher" <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	siqueira@...lia.com,
	airlied@...il.com,
	simona@...ll.ch,
	"Raag Jadav" <raag.jadav@...el.com>,
	rodrigo.vivi@...el.com,
	jani.nikula@...ux.intel.com,
	Xaver Hugl <xaver.hugl@...il.com>,
	Krzysztof Karas <krzysztof.karas@...el.com>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	kernel-dev@...lia.com,
	amd-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org,
	André Almeida <andrealmeid@...lia.com>
Subject: [PATCH v6 2/3] drm/doc: Add a section about "Task information" for the wedge API

Add a section about "Task information" for the wedge API.

Reviewed-by: Krzysztof Karas <krzysztof.karas@...el.com>
Reviewed-by: Raag Jadav <raag.jadav@...el.com>
Signed-off-by: André Almeida <andrealmeid@...lia.com>
---
v5:
 - Change app to task in the text as well
v4:
 - Change APP to TASK
v3:
 - Change "app that caused ..." to "app involved ..."
 - Clarify that devcoredump have more information about what happened
 - Update that PID and APP will be empty if there's no app info
---
 Documentation/gpu/drm-uapi.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
index 69f72e71a96e..24aa9f320ebc 100644
--- a/Documentation/gpu/drm-uapi.rst
+++ b/Documentation/gpu/drm-uapi.rst
@@ -446,6 +446,23 @@ telemetry information (devcoredump, syslog). This is useful because the first
 hang is usually the most critical one which can result in consequential hangs or
 complete wedging.
 
+Task information
+---------------
+
+The information about which application (if any) was involved in the device
+wedging is useful for userspace if they want to notify the user about what
+happened (e.g. the compositor display a message to the user "The <task name>
+caused a graphical error and the system recovered") or to implement policies
+(e.g. the daemon may "ban" an task that keeps resetting the device). If the task
+information is available, the uevent will display as ``PID=<pid>`` and
+``TASK=<task name>``. Otherwise, ``PID`` and ``TASK`` will not appear in the
+event string.
+
+The reliability of this information is driver and hardware specific, and should
+be taken with a caution regarding it's precision. To have a big picture of what
+really happened, the devcoredump file provides should have much more detailed
+information about the device state and about the event.
+
 Consumer prerequisites
 ----------------------
 
-- 
2.49.0