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scsi: cxlflash: Support LUN provisioning

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Adopt the SISLite AFU LUN provisioning capability to allow future CXL
Flash adapters the ability to better manage storage. Update the SISLite
header with the changes necessary to support LUN provision operations
and create a host ioctl interface for user LUN management 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 21:16:13 -05:00 • committed by Martin K. Petersen
commit 9cf43a3604
6 changed files with 192 additions and 9 deletions
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31
Documentation/powerpc/cxlflash.txt
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@ -382,3 +382,34 @@ CXL Flash Driver Host IOCTLs
The structure definitions for these IOCTLs are available in:
uapi/scsi/cxlflash_ioctl.h
HT_CXLFLASH_LUN_PROVISION
-------------------------
This ioctl is used to create and delete persistent LUNs on cxlflash
devices that lack an external LUN management interface. It is only
valid when used with AFUs that support the LUN provision capability.
When sufficient space is available, LUNs can be created by specifying
the target port to host the LUN and a desired size in 4K blocks. Upon
success, the LUN ID and WWID of the created LUN will be returned and
the SCSI bus can be scanned to detect the change in LUN topology. Note
that partial allocations are not supported. Should a creation fail due
to a space issue, the target port can be queried for its current LUN
geometry.
To remove a LUN, the device must first be disassociated from the Linux
SCSI subsystem. The LUN deletion can then be initiated by specifying a
target port and LUN ID. Upon success, the LUN geometry associated with
the port will be updated to reflect new number of provisioned LUNs and
available capacity.
To query the LUN geometry of a port, the target port is specified and
upon success, the following information is presented:
- Maximum number of provisioned LUNs allowed for the port
- Current number of provisioned LUNs for the port
- Maximum total capacity of provisioned LUNs for the port (4K blocks)
- Current total capacity of provisioned LUNs for the port (4K blocks)
With this information, the number of available LUNs and capacity can be
can be calculated.