Documentation: RAS: Add index and address translation section

There are a lot of RAS topic to document, and there are a lot of details
for each topic.

Prep for this by adding an index for the RAS directory. This will
provide a top-level document and table of contents. It also provides the
option to build the RAS directory individually using "make SPHINXDIRS=".

Start a section on address translation. This will be expanded with
details for future translation methods and how they're used in the
kernel.

Move the error decoding topic to its own section. Links to other error
decoding kernel docs will be added.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240123041401.79812-4-yazen.ghannam@amd.com

diff --git a/Documentation/RAS/address-translation.rst b/Documentation/RAS/address-translation.rst
new file mode 100644 (file)
index 0000000..f0ca17b
--- /dev/null
+++ b/Documentation/RAS/address-translation.rst
@@ -0,0 +1,24 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Address translation
+===================
+
+x86 AMD
+-------
+
+Zen-based AMD systems include a Data Fabric that manages the layout of
+physical memory. Devices attached to the Fabric, like memory controllers,
+I/O, etc., may not have a complete view of the system physical memory map.
+These devices may provide a "normalized", i.e. device physical, address
+when reporting memory errors. Normalized addresses must be translated to
+a system physical address for the kernel to action on the memory.
+
+AMD Address Translation Library (CONFIG_AMD_ATL) provides translation for
+this case.
+
+Glossary of acronyms used in address translation for Zen-based systems
+
+* CCM               = Cache Coherent Moderator
+* COD               = Cluster-on-Die
+* COH_ST            = Coherent Station
+* DF                = Data Fabric

diff --git a/Documentation/RAS/ras.rst b/Documentation/RAS/error-decoding.rst
similarity index 73%
rename from Documentation/RAS/ras.rst
rename to Documentation/RAS/error-decoding.rst
index 2556b397cd271fc536daf727a9f7ea178fac6e02..26a72f3fe5de83230db5c51403fc8c462649b490 100644 (file)
--- a/Documentation/RAS/ras.rst
+++ b/Documentation/RAS/error-decoding.rst
@@ -1,15 +1,10 @@
 .. SPDX-License-Identifier: GPL-2.0
 
-Reliability, Availability and Serviceability features
-=====================================================
-
-This documents different aspects of the RAS functionality present in the
-kernel.
-
 Error decoding
----------------
+==============
 
-* x86
+x86
+---
 
 Error decoding on AMD systems should be done using the rasdaemon tool:
 https://github.com/mchehab/rasdaemon/

diff --git a/Documentation/RAS/index.rst b/Documentation/RAS/index.rst
new file mode 100644 (file)
index 0000000..2794c18
--- /dev/null
+++ b/Documentation/RAS/index.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================================================
+Reliability, Availability and Serviceability (RAS) features
+===========================================================
+
+This documents different aspects of the RAS functionality present in the
+kernel.
+
+.. toctree::
+   :maxdepth: 2
+
+   error-decoding
+   address-translation

diff --git a/Documentation/index.rst b/Documentation/index.rst
index 36e61783437c1034cfbeb19aa662be64fea80857..07f2aa07f0fa087b051da5eec857727a5a6cbb4b 100644 (file)
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -113,7 +113,7 @@ to ReStructured Text format, or are simply too old.
    :maxdepth: 1
 
    staging/index
-   RAS/ras
+   RAS/index
 
 
 Translations

diff --git a/MAINTAINERS b/MAINTAINERS
index 25537a37338e513b945ba91b590d3f9e39d5a774..5b945fd5a3b91100940ce07d0b62fa716cf4b23c 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18359,6 +18359,7 @@ M:      Tony Luck <tony.luck@intel.com>
 M:     Borislav Petkov <bp@alien8.de>
 L:     linux-edac@vger.kernel.org
 S:     Maintained
+F:     Documentation/RAS/
 F:     Documentation/admin-guide/ras.rst
 F:     drivers/ras/
 F:     include/linux/ras.h