[PATCH v3 01/17] cxl: update documentation structure in prep for new docs

Gregory Price
2025-05-12T16:21:44Z

Restructure the cxl folder to make adding docs per-page cleaner.

Signed-off-by: Gregory Price <gourry@gourry.net>
---
Documentation/driver-api/cxl/index.rst | 16 +++++++++++++---
.../cxl/{ => linux}/access-coordinates.rst | 0
...emory-devices.rst => theory-of-operation.rst} | 10 +++++-----
3 files changed, 18 insertions(+), 8 deletions(-)
rename Documentation/driver-api/cxl/{ => linux}/access-coordinates.rst (100%)
rename Documentation/driver-api/cxl/{memory-devices.rst => theory-of-operation.rst} (98%)

diff --git a/Documentation/driver-api/cxl/index.rst b/Documentation/driver-api/cxl/index.rst
index 965ba90e8fb7..fe1594dc6778 100644
--- a/Documentation/driver-api/cxl/index.rst
+++ b/Documentation/driver-api/cxl/index.rst
@@ -4,12 +4,22 @@
Compute Express Link
====================

+CXL device configuration has a complex handoff between platform (Hardware,
+BIOS, EFI), OS (early boot, core kernel, driver), and user policy decisions
+that have impacts on each other. The docs here break up configurations steps.
+
+.. toctree::
+ :maxdepth: 2
+ :caption: Overview
+
+ theory-of-operation
+ maturity-map
+
.. toctree::
:maxdepth: 1
+ :caption: Linux Kernel Configuration

- memory-devices
- access-coordinates
+ linux/access-coordinates

- maturity-map

.. only:: subproject and html
diff --git a/Documentation/driver-api/cxl/access-coordinates.rst b/Documentation/driver-api/cxl/linux/access-coordinates.rst
similarity index 100%
rename from Documentation/driver-api/cxl/access-coordinates.rst
rename to Documentation/driver-api/cxl/linux/access-coordinates.rst
diff --git a/Documentation/driver-api/cxl/memory-devices.rst b/Documentation/driver-api/cxl/theory-of-operation.rst
similarity index 98%
rename from Documentation/driver-api/cxl/memory-devices.rst
rename to Documentation/driver-api/cxl/theory-of-operation.rst
index d732c42526df..32739e253453 100644
--- a/Documentation/driver-api/cxl/memory-devices.rst
+++ b/Documentation/driver-api/cxl/theory-of-operation.rst
@@ -1,9 +1,9 @@
.. SPDX-License-Identifier: GPL-2.0
.. include:: <isonum.txt>

-===================================
-Compute Express Link Memory Devices
-===================================
+===============================================
+Compute Express Link Driver Theory of Operation
+===============================================

A Compute Express Link Memory Device is a CXL component that implements the
CXL.mem protocol. It contains some amount of volatile memory, persistent memory,
@@ -14,8 +14,8 @@ that optionally define a device's contribution to an interleaved address
range across multiple devices underneath a host-bridge or interleaved
across host-bridges.

-CXL Bus: Theory of Operation
-============================
+The CXL Bus
+===========
Similar to how a RAID driver takes disk objects and assembles them into a new
logical device, the CXL subsystem is tasked to take PCIe and ACPI objects and
assemble them into a CXL.mem decode topology. The need for runtime configuration
--
2.49.0