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Subject[PATCH v2 0/9] Add Host control mode to HPB
v1 -> v2:
- attend Greg's and Daejun's comments
- add patch 9 making host mode parameters configurable
- rebase on Daejun's v19

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 V19 device-control HPB1.0 driver, see
msg-id: 20210129052848epcms2p6e5797efd94e6282b76ad9ae6c99e3ab5@epcms2p6
in The patches are also available in wdc ufs repo:

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


Avri Altman (9):
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
scsi: ufshpb: Make host mode parameters configurable

drivers/scsi/ufs/ufshcd.c | 1 +
drivers/scsi/ufs/ufshcd.h | 2 +
drivers/scsi/ufs/ufshpb.c | 697 +++++++++++++++++++++++++++++++++++---
drivers/scsi/ufs/ufshpb.h | 47 +++
4 files changed, 697 insertions(+), 50 deletions(-)


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