cxl: Document missing sysfs files

Add to the ABI documentation the payload_max and label_storage_size
read-only files, which have been there since the early days.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/20250218224853.67457-3-dave@stgolabs.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
index 7bdf0eb79d7c727383cc3f59333b13775e705873..04a880bd1dde3c863c2f8dcb3cccc9d6d52db24c 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-cxl
+++ b/Documentation/ABI/testing/sysfs-bus-cxl
@@ -18,6 +18,24 @@ Description:
                specification.
 
 
+What:          /sys/bus/cxl/devices/memX/payload_max
+Date:          December, 2020
+KernelVersion: v5.12
+Contact:       linux-cxl@vger.kernel.org
+Description:
+               (RO) Maximum size (in bytes) of the mailbox command payload
+               registers. Linux caps this at 1MB if the device reports a
+               larger size.
+
+
+What:          /sys/bus/cxl/devices/memX/label_storage_size
+Date:          May, 2021
+KernelVersion: v5.13
+Contact:       linux-cxl@vger.kernel.org
+Description:
+               (RO) Size (in bytes) of the Label Storage Area (LSA).
+
+
 What:          /sys/bus/cxl/devices/memX/ram/size
 Date:          December, 2020
 KernelVersion: v5.12