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(-) -- 2.25.1
