linux-kernel - [PATCH v4 2/2] Documentation/gpu: Add fdinfo meanings of drm-*-internal memory tags

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Message-ID: <20241211163436.381069-3-adrian.larumbe@collabora.com>
Date: Wed, 11 Dec 2024 16:34:32 +0000
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>
Cc: kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/2] Documentation/gpu: Add fdinfo meanings of drm-*-internal memory tags

A previous commit enabled display of driver-internal kernel BO sizes
through the device file's fdinfo interface.

Expand the description of the relevant driver-specific key:value pairs
with the definitions of the new drm-*-internal ones.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 Documentation/gpu/panthor.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/gpu/panthor.rst b/Documentation/gpu/panthor.rst
index 3f8979fa2b86..c6d8236e3665 100644
--- a/Documentation/gpu/panthor.rst
+++ b/Documentation/gpu/panthor.rst
@@ -26,6 +26,10 @@ the currently possible format options:
      drm-cycles-panthor:     94439687187
      drm-maxfreq-panthor:    1000000000 Hz
      drm-curfreq-panthor:    1000000000 Hz
+     drm-total-internal:     10396 KiB
+     drm-shared-internal:    0
+     drm-active-internal:    10396 KiB
+     drm-resident-internal:  10396 KiB
      drm-total-memory:       16480 KiB
      drm-shared-memory:      0
      drm-active-memory:      16200 KiB
@@ -44,3 +48,13 @@ driver by writing into the appropriate sysfs node::
 
 Where `N` is a bit mask where cycle and timestamp sampling are respectively
 enabled by the first and second bits.
+
+Possible `drm-*-internal` key names are: `total`, `active` and `resident`.
+These values convey the sizes of the internal driver-owned shmem BO's that
+aren't exposed to user-space through a DRM handle, like queue ring buffers,
+sync object arrays and heap chunks. Because they are all allocated and pinned
+at creation time, `drm-resident-internal` and `drm-total-internal` should always
+be equal. `drm-active-internal` shows the size of kernel BO's associated with
+VM's and groups currently being scheduled for execution by the GPU.
+`drm-shared-memory` is unused at present, but in the future it might stand for
+the size of the Firmware regions, since they do not belong to an open file context.
-- 
2.47.0