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| author | Avri Altman <avri.altman@wdc.com> | 2018-10-07 17:30:35 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-11 06:09:46 +0300 |
| commit | df032bf27a414acf61c957ec2fad22a57d903b39 (patch) | |
| tree | 7ad9122c3e8252b3358cacbf713f087509a94663 /drivers/scsi/ufs/Kconfig | |
| parent | a851b2bd363220feacbf36adb49616a49edc99fb (diff) | |
| download | linux-df032bf27a414acf61c957ec2fad22a57d903b39.tar.xz | |
scsi: ufs: Add a bsg endpoint that supports UPIUs
For now, just provide an API to allocate and remove ufs-bsg node. We
will use this framework to manage ufs devices by sending UPIU
transactions.
For the time being, implements an empty bsg_request() - will add some
more functionality in coming patches.
Nonetheless, we reveal here the protocol we are planning to use: UFS
Transport Protocol Transactions. UFS transactions consist of packets
called UFS Protocol Information Units (UPIU).
There are UPIU’s defined for UFS SCSI commands, responses, data in and
data out, task management, utility functions, vendor functions,
transaction synchronization and control, and more.
By using UPIUs, we get access to the most fine-grained internals of this
protocol, and able to communicate with the device in ways, that are
sometimes beyond the capacity of the ufs driver.
Moreover and as a result, our core structure - ufs_bsg_node has a pretty
lean structure: using upiu transactions that contains the outmost
detailed info, so we don't really need complex constructs to support it.
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/Kconfig')
| -rw-r--r-- | drivers/scsi/ufs/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index e09fe6ab3572..2ddd426323e9 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -109,3 +109,22 @@ config SCSI_UFS_HISI Select this if you have UFS controller on Hisilicon chipset. If unsure, say N. + +config SCSI_UFS_BSG + bool "Universal Flash Storage BSG device node" + depends on SCSI_UFSHCD + select BLK_DEV_BSGLIB + help + Universal Flash Storage (UFS) is SCSI transport specification for + accessing flash storage on digital cameras, mobile phones and + consumer electronic devices. + A UFS controller communicates with a UFS device by exchanging + UFS Protocol Information Units (UPIUs). + UPIUs can not only be used as a transport layer for the SCSI protocol + but are also used by the UFS native command set. + This transport driver supports exchanging UFS protocol information units + with a UFS device. See also the ufshcd driver, which is a SCSI driver + that supports UFS devices. + + Select this if you need a bsg device node for your UFS controller. + If unsure, say N. |