[PATCH 0/8] Add Host control mode to HPB

Avri Altman
2021-01-27T15:14:20Z

The HPB spec defines 2 control modes - device control mode and host
control mode. In oppose to device control mode, in which the host obey
to whatever recommendation received from the device - In host control
mode, the host uses its own algorithms to decide which regions should
be activated or inactivated.

We kept the host managed heuristic simple and concise.

Aside from adding a by-spec functionality, host control mode entails
some further potential benefits: makes the hpb logic transparent and
readable, while allow tuning / scaling its various parameters, and
utilize system-wide info to optimize HPB potential.

This series is based on Samsung's V18 device-control HPB1.0 driver, see
msg-id: 20201222015704epcms2p643f0c5011064a7ce56b08331811a8509@epcms2p6
in lore.kernel.org. The patches are also available in wdc ufs repo:
https://github.com/westerndigitalcorporation/WDC-UFS-REPO/tree/hpb-v18

This version was tested on Galaxy S20, and Xiaomi Mi10 pro.
Your meticulous review and testing is mostly welcome and appreciated.

Thanks,
Avri

Avri Altman (8):
scsi: ufshpb: Cache HPB Control mode on init
scsi: ufshpb: Add host control mode support to rsp_upiu
scsi: ufshpb: Add region's reads counter
scsi: ufshpb: Make eviction depends on region's reads
scsi: ufshpb: Region inactivation in host mode
scsi: ufshpb: Add hpb dev reset response
scsi: ufshpb: Add "Cold" regions timer
scsi: ufshpb: Add support for host control mode

drivers/scsi/ufs/ufshpb.c | 430 +++++++++++++++++++++++++++++++++-----
drivers/scsi/ufs/ufshpb.h | 23 ++
2 files changed, 406 insertions(+), 47 deletions(-)

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2.25.1