linux-kernel - [PATCH v9 00/12] Add Host control mode to HPB

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Message-Id: <20210524111913.61303-1-avri.altman@wdc.com>
Date:   Mon, 24 May 2021 14:19:01 +0300
From:   Avri Altman <avri.altman@....com>
To:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, Bart Van Assche <bvanassche@....org>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        alim.akhtar@...sung.com, asutoshd@...eaurora.org,
        Zang Leigang <zangleigang@...ilicon.com>,
        Avi Shchislowski <avi.shchislowski@....com>,
        Bean Huo <beanhuo@...ron.com>, cang@...eaurora.org,
        stanley.chu@...iatek.com, Avri Altman <avri.altman@....com>
Subject: [PATCH v9 00/12] Add Host control mode to HPB

v8 -> v9:
 - Add one more patch: do not send unmap_all in host mode
 - rebase on Daejun's v35
 - tested on one more platform - Galaxy S21

v7 -> v8:
 - restore Daejun atomic argument to ufshpb_get_req (v31)
 - Add Daejun's Reviewed-by tag

v6 -> v7:
 - attend CanG's comments
 - add one more patch to transform set_dirty to iterate_rgn
 - rebase on Daejun's v32

v5 -> v6:
 - attend CanG's comments
 - rebase on Daejun's v29

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 device-control HPB2.0 driver

This version was tested on Galaxy S21, Galaxy S20, and Xiaomi Mi10 pro.
Your meticulous review and testing is mostly welcome and appreciated.

Thanks,
Avri

Avri Altman (12):
  scsi: ufshpb: Cache HPB Control mode on init
  scsi: ufshpb: Add host control mode support to rsp_upiu
  scsi: ufshpb: Transform set_dirty to iterate_rgn
  scsi: ufshpb: Add 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: Do not send umap_all in host control mode
  scsi: ufshpb: Add support for host control mode
  scsi: ufshpb: Make host mode parameters configurable

 Documentation/ABI/testing/sysfs-driver-ufs |  84 ++-
 drivers/scsi/ufs/ufshcd.h                  |   2 +
 drivers/scsi/ufs/ufshpb.c                  | 582 ++++++++++++++++++++-
 drivers/scsi/ufs/ufshpb.h                  |  44 ++
 4 files changed, 673 insertions(+), 39 deletions(-)

-- 
2.25.1