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scsi: cxlflash: Support AFU debug

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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 <[email protected]>
Signed-off-by: Uma Krishnan <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
This commit is contained in:
Matthew R. Ochs 2017-06-21 21:16:22 -05:00 • committed by Martin K. Petersen
commit bc88ac47d5
6 changed files with 152 additions and 3 deletions
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14
Documentation/powerpc/cxlflash.txt
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@ -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.