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-rw-r--r--Documentation/powerpc/cxlflash.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/powerpc/cxlflash.txt b/Documentation/powerpc/cxlflash.txt
index 2d6297b4ad80..a64bdaa0a1cf 100644
--- a/Documentation/powerpc/cxlflash.txt
+++ b/Documentation/powerpc/cxlflash.txt
@@ -413,3 +413,17 @@ HT_CXLFLASH_LUN_PROVISION
With this information, the number of available LUNs and capacity can be
can be calculated.
+
+HT_CXLFLASH_AFU_DEBUG
+---------------------
+ This ioctl is used to debug AFUs by supporting a command pass-through
+ interface. It is only valid when used with AFUs that support the AFU
+ debug capability.
+
+ With exception of buffer management, AFU debug commands are opaque to
+ cxlflash and treated as pass-through. For debug commands that do require
+ data transfer, the user supplies an adequately sized data buffer and must
+ specify the data transfer direction with respect to the host. There is a
+ maximum transfer size of 256K imposed. Note that partial read completions
+ are not supported - when errors are experienced with a host read data
+ transfer, the data buffer is not copied back to the user.