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| author | Avri Altman <avri.altman@wdc.com> | 2018-10-07 17:30:37 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-11 06:09:46 +0300 |
| commit | 5e0a86eed84607432436766e3e1bb37f8318f7b2 (patch) | |
| tree | 957b78c37518c0123094352d69a7a827c31143be /drivers/scsi/ufs/ufs.h | |
| parent | 220d17a69de432e520461531cb569f75a43ed6f5 (diff) | |
| download | linux-5e0a86eed84607432436766e3e1bb37f8318f7b2.tar.xz | |
scsi: ufs: Add API to execute raw upiu commands
The UFS host software uses a combination of a host register set and
Transfer Request Descriptors in system memory to communicate with host
controller hardware. In its mmio space, a separate places are assigned
to UTP Transfer Request Descriptor ("utrd") list, and to UTP Task
Management Request Descriptor ("utmrd") list.
The provided API supports utrd-typed requests: nop out and device
management commands. It also supports utmrd-type requests:
task management requests. Other UPIU types are not supported for now.
We utilize the already existing code for tag and task work queues.
That is, all utrd-typed UPIUs are "disguised" as device management
commands. Similarly, the utmrd-typed UPUIs uses the task management
infrastructure.
It is up to the caller to fill the upiu request properly, as it will be
copied without any further input validations.
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs/ufs.h')
| -rw-r--r-- | drivers/scsi/ufs/ufs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h index f5800c3203b0..58087d3916d0 100644 --- a/drivers/scsi/ufs/ufs.h +++ b/drivers/scsi/ufs/ufs.h @@ -414,6 +414,7 @@ enum { MASK_RSP_UPIU_DATA_SEG_LEN = 0xFFFF, MASK_RSP_EXCEPTION_EVENT = 0x10000, MASK_TM_SERVICE_RESP = 0xFF, + MASK_TM_FUNC = 0xFF, }; /* Task management service response */ |