scsi: ufs: ufshpb: Add handing of device reset regions in HPB device mode

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In UFS HPB Spec JESD220-3A,

"5.8. Active and inactive information upon power cycle
...
When the device is powered off by the host, the device may restore L2P map
data upon power up or build from the host's HPB READ command. In case
device powered up and lost HPB information, device can signal to the host
through HPB Sense data, by setting HPB Operation as '2' which will inform
the host that device reset HPB information."

Therefore, for HPB device control mode, if the UFS device is reset via the
RST_N pin, the active region information in the device will be reset. If
the host side receives this notification from the device side, it is
recommended to inactivate all active regions in the host's HPB cache.

Link: https://lore.kernel.org/r/20220505134707.35929-6-huobean@gmail.com
Reviewed-by: Keoseong Park <keosung.park@samsung.com>
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

...

This commit is contained in:

Bean Huo 2022-05-05 15:47:06 +02:00 • committed by Martin K. Petersen

parent d4300c552b

commit 32d6eab31a

1 changed files with 58 additions and 24 deletions

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drivers/scsi/ufs/ufshpb.c

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