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scsi: cxlflash: Support SQ Command Mode

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The SISLite specification outlines a new queuing model to improve
over the MMIO-based IOARRIN model that exists today. This new model
uses a submission queue that exists in host memory and is shared with
the device. Each entry in the queue is an IOARCB that describes a
transfer request. When requests are submitted, IOARCBs ('current'
position tracked in host software) are populated and the submission
queue tail pointer is then updated via MMIO to make the device aware
of the requests.

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
2017-01-11 19:19:33 -06:00
committed by Martin K. Petersen
parent 9c7d1ee5f1
commit 696d0b0c71
5 changed files with 153 additions and 13 deletions
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include/uapi/scsi/cxlflash_ioctl.h
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@@ -40,6 +40,7 @@ struct dk_cxlflash_hdr {
*/
#define DK_CXLFLASH_ALL_PORTS_ACTIVE 0x0000000000000001ULL
#define DK_CXLFLASH_APP_CLOSE_ADAP_FD 0x0000000000000002ULL
#define DK_CXLFLASH_CONTEXT_SQ_CMD_MODE 0x0000000000000004ULL
/*
* General Notes: