cxl: Sync up the driver-api/cxl documentation

pmem.c regs.c mbox.c identifiers were missing. Add them to
memory-devices.rst following their respective DOC comment includes.

Two acpi.c identifiers were available, but not used in kernel-doc's:
1) Add add_cxl_resources to memory-devices.rst and fix up the Sphinx
complaint on the ascii art by escaping it.
2) Add cxl_acpi_evaluate_qtg_dsm to access-coordinates.rst.

core/features.c is new. Add a "DOC: cxl features" comment to the
source and identifiers to memory_devices.rst.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/20250513215813.1419645-1-alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: AlisonSchofield

Documentation/driver-api/cxl/linux/access-coordinates.rst

@@ -90,3 +90,6 @@ under the same ACPI0017 device to form a new xarray.
 Finally, the cxl_region_update_bandwidth() is called and the aggregated
 bandwidth from all the members of the last xarray is updated for the
 access coordinates residing in the cxl region (cxlr) context.
+
+.. kernel-doc:: drivers/cxl/acpi.c
+   :identifiers: cxl_acpi_evaluate_qtg_dsm

Documentation/driver-api/cxl/theory-of-operation.rst

@@ -347,6 +347,9 @@ CXL Core
 .. kernel-doc:: drivers/cxl/cxl.h
    :internal:
 
+.. kernel-doc:: drivers/cxl/acpi.c
+   :identifiers: add_cxl_resources
+
 .. kernel-doc:: drivers/cxl/core/hdm.c
    :doc: cxl core hdm
 
@@ -371,12 +374,27 @@ CXL Core
 .. kernel-doc:: drivers/cxl/core/pmem.c
    :doc: cxl pmem
 
+.. kernel-doc:: drivers/cxl/core/pmem.c
+   :identifiers:
+
 .. kernel-doc:: drivers/cxl/core/regs.c
    :doc: cxl registers
 
+.. kernel-doc:: drivers/cxl/core/regs.c
+   :identifiers:
+
 .. kernel-doc:: drivers/cxl/core/mbox.c
    :doc: cxl mbox
 
+.. kernel-doc:: drivers/cxl/core/mbox.c
+   :identifiers:
+
+.. kernel-doc:: drivers/cxl/core/features.c
+   :doc: cxl features
+
+.. kernel-doc:: drivers/cxl/core/features.c
+   :identifiers:
+
 CXL Regions
 -----------
 .. kernel-doc:: drivers/cxl/core/region.c

drivers/cxl/acpi.c

@@ -749,10 +749,10 @@ static void remove_cxl_resources(void *data)
  * expanding its boundaries to ensure that any conflicting resources become
  * children. If a window is expanded it may then conflict with a another window
  * entry and require the window to be truncated or trimmed. Consider this
- * situation:
+ * situation::
  *
- * |-- "CXL Window 0" --||----- "CXL Window 1" -----|
- * |--------------- "System RAM" -------------|
+ *	|-- "CXL Window 0" --||----- "CXL Window 1" -----|
+ *	|--------------- "System RAM" -------------|
  *
  * ...where platform firmware has established as System RAM resource across 2
  * windows, but has left some portion of window 1 for dynamic CXL region

drivers/cxl/core/features.c

@@ -9,6 +9,15 @@
 #include "core.h"
 #include "cxlmem.h"
 
+/**
+ * DOC: cxl features
+ *
+ * A CXL device that includes a mailbox supports commands that allows
+ * listing, getting, and setting of optionally defined features such
+ * as memory sparing or post package sparing. Vendors may define custom
+ * features for the device.
+ */
+
 /* All the features below are exclusive to the kernel */
 static const uuid_t cxl_exclusive_feats[] = {
 	CXL_FEAT_PATROL_SCRUB_UUID,