[PATCH v4] drm: add overview diagram for drm stack

[Abdulrasaq Lawani <abdulrasaqolawani@gmail.com>]

Add an overview diagram of Linux DRM architecture for
graphics and compute to introduction.rst

Signed-off-by: Abdulrasaq Lawani <abdulrasaqolawani@gmail.com>
---
Changes in v4:
- Ensure patch description describe diff adding overview diagram.
- Link to v3: https://lore.kernel.org/r/20250527-drm-doc-updates-v3-1-58e97a831d03@gmail.com

Changes in v3:
- revert the promotion of the overview diagram header
- Link to v2: https://lore.kernel.org/r/20250523-drm-doc-updates-v2-0-e517df152cf6@gmail.com

Changes in v2:
- Update the overview diagram to display correctly by putting in a literal block.
- Also update the overview section diagram to a higher order.
- Ensured docs are successfully rendering by building for htmldocs and pdfdocs.
- Rendered pages are okay on html and pdf.
- Link to v1: https://lore.kernel.org/r/20250522-drm-doc-updates-v1-1-d1efd54740bd@gmail.com
---
 Documentation/gpu/introduction.rst | 40 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/Documentation/gpu/introduction.rst b/Documentation/gpu/introduction.rst
index 3cd0c8860b949408ed570d3f9384edd5f03df002..a8d3f953a470180b395ec52a45d0f3f4561424e0 100644
--- a/Documentation/gpu/introduction.rst
+++ b/Documentation/gpu/introduction.rst
@@ -14,7 +14,45 @@ including the TTM memory manager, output configuration and mode setting,
 and the new vblank internals, in addition to all the regular features
 found in current kernels.
 
-[Insert diagram of typical DRM stack here]
+Overview of the Linux DRM Architecture
+--------------------------------------
+::
+
+        +-----------------------------+
+        |     User-space Apps         |
+        | (Games, Browsers, ML, etc.) |
+        +-----------------------------+
+                      |
+                      v
+        +---------------------------------------+
+        |    Graphics APIs   |   Compute APIs   |
+        |  (OpenGL, Vulkan)  |  (OpenCL, CUDA)  |
+        +---------------------------------------+
+                |                   |
+                v                   v
+        +---------------------+  +-----------------------+
+        |  User-space Driver  |  |    Compute Runtime    |
+        |  (Mesa, AMD/NVIDIA) |  |  (OpenCL, CUDA, ROCm) |
+        +---------------------+  +-----------------------+
+                |                   |
+                +--------+----------+
+                         |
+                         v
+                +-----------------------+
+                |   libdrm (DRM API)    |
+                +-----------------------+
+                          |
+                          v
+        +-------------------------------------------+
+        |     Kernel DRM/KMS Driver (i915, amdgpu,  |
+        |     nouveau, etc.)                        |
+        +-------------------------------------------+
+                |                       |
+                v                       v
+        +----------------+     +-------------------+
+        | GPU Display HW |     | GPU Compute Units |
+        +----------------+     +-------------------+
+
 
 Style Guidelines
 ================

---
base-commit: 4d07f5440d7afee27dada528aaf5230e760531cb
change-id: 20250522-drm-doc-updates-3686f6d48122

Best regards,
-- 
Abdulrasaq Lawani <abdulrasaqolawani@gmail.com>