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scsi: cxlflash: Introduce host ioctl support

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As staging for supporting various host management functions, add a host
ioctl infrastructure to filter ioctl commands and perform operations that
are common for all host ioctls. Also update the cxlflash documentation to
create a new section for documenting host ioctls.

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>
This commit is contained in:
Matthew R. Ochs
2017-06-21 21:15:42 -05:00
committed by Martin K. Petersen
parent cf24302790
commit d6e32f530d
4 changed files with 168 additions and 5 deletions
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19
Documentation/powerpc/cxlflash.txt
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@@ -124,8 +124,8 @@ Block library API
http://github.com/open-power/capiflash
CXL Flash Driver IOCTLs
=======================
CXL Flash Driver LUN IOCTLs
===========================
Users, such as the block library, that wish to interface with a flash
device (LUN) via user space access need to use the services provided
@@ -367,3 +367,18 @@ DK_CXLFLASH_MANAGE_LUN
exclusive user space access (superpipe). In case a LUN is visible
across multiple ports and adapters, this ioctl is used to uniquely
identify each LUN by its World Wide Node Name (WWNN).
CXL Flash Driver Host IOCTLs
============================
Each host adapter instance that is supported by the cxlflash driver
has a special character device associated with it to enable a set of
host management function. These character devices are hosted in a
class dedicated for cxlflash and can be accessed via /dev/cxlflash/*.
Applications can be written to perform various functions using the
host ioctl APIs below.
The structure definitions for these IOCTLs are available in:
uapi/scsi/cxlflash_ioctl.h