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authorMatthew R. Ochs <mrochs@linux.vnet.ibm.com>2017-06-22 05:16:22 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2017-06-26 22:01:12 +0300
commitbc88ac47d5cb11c7dd9896781f793fae519d53fa (patch)
tree0a5955e480acc1eeef0a2388697f77c516695d80 /Documentation/powerpc
parent9cf43a360450ddd758b0021d1b55f1cc5643b9ed (diff)
downloadlinux-bc88ac47d5cb11c7dd9896781f793fae519d53fa.tar.xz
scsi: cxlflash: Support AFU debug
Adopt the SISLite AFU debug capability to allow future CXL Flash adapters the ability to better debug AFU issues. Update the SISLite header with the changes necessary to support AFU debug operations and create a host ioctl interface for user debug software. Also update the cxlflash documentation to describe this new host ioctl. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation/powerpc')
-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.