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Subject[PATCH v5 00/10] Add Host control mode to HPB
Date
v4 -> v5:
- attend Daejun's comments
- Control the number of inflight map requests

v3 -> v4:
- rebase on Daejun's v25

v2 -> v3:
- Attend Greg's and Can's comments
- rebase on Daejun's v21

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 V25 device-control HPB2.0 driver, see
msg-id: 20210226073233epcms2p80fca2dffabea03143a9414838f757633@epcms2p8
in lore.kernel.org.

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 (10):
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: Limit the number of inflight map requests
scsi: ufshpb: Add support for host control mode
scsi: ufshpb: Make host mode parameters configurable

Documentation/ABI/testing/sysfs-driver-ufs | 74 +++
drivers/scsi/ufs/ufshcd.h | 2 +
drivers/scsi/ufs/ufshpb.c | 555 ++++++++++++++++++++-
drivers/scsi/ufs/ufshpb.h | 39 ++
4 files changed, 646 insertions(+), 24 deletions(-)

--
2.25.1

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