linux-kernel - [PATCH] drm/vkms: Add "hardware limitation" emulation TODO

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Message-Id: <20250225-vkms-update-todo-v1-1-afb1e6f7d714@bootlin.com>
Date: Tue, 25 Feb 2025 16:46:22 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Haneen Mohammed <hamohammed.sa@...il.com>, 
 Simona Vetter <simona@...ll.ch>, Melissa Wen <melissa.srw@...il.com>, 
 David Airlie <airlied@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Jonathan Corbet <corbet@....net>
Cc: thomas.petazzoni@...tlin.com, dri-devel@...ts.freedesktop.org, 
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH] drm/vkms: Add "hardware limitation" emulation TODO

Add the hardware limitation todo.

Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 Documentation/gpu/vkms.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
index ba04ac7c2167..d5bc602547e7 100644
--- a/Documentation/gpu/vkms.rst
+++ b/Documentation/gpu/vkms.rst
@@ -147,6 +147,15 @@ module. Use/Test-cases:
 - Change output configuration: Plug/unplug screens, change EDID, allow changing
   the refresh rate.
 
+- Emulating Hardware Limitations with eBPF for MST and Atomic Checks
+  Hardware limitations can often prevent valid DRM configurations during
+  atomic checks. Examples of such limitations include bandwidth constraints in
+  MST and limited clock signals for multiple CRTCs.
+  These limitations are dynamic and require extensive checks, making them
+  difficult to describe statically. To address this, we propose creating an
+  eBPF interface for atomic checks. This interface will allow userspace applications
+  to simulate and enforce custom hardware limitations.
+
 The currently proposed solution is to expose vkms configuration through
 configfs. All existing module options should be supported through configfs
 too.

---
base-commit: acf3256160bdabcb5c07032f3bf6eb5a21f5b95f
change-id: 20250225-vkms-update-todo-50701246bcd8

Best regards,
-- 
Louis Chauvet <louis.chauvet@...tlin.com>