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Subject[PATCH v2 0/5] UFS Host Performance Booster (HPB v1.0) driver
From: Bean Huo <>

I disclose my development/changes on UFS HPB (UFS Host Performance Booster) to
the community, as this would enable more UFS developers to test and start an
iterative review and update process.

The HPB is defined in Jedec Standard Universal Flash (UFS) Host Performance
Booster (HPB) Extension Version 1.0, which is designed to improve read
performance by utilizing the host side memory. Based on our testing, the HPB
can increase the random read performance by up to about 46% in the random read.

The original HPB driver is from [1]. Based on it, I did optimizations,
simplifications, fixed reliability issues, implemented HPB host control mode
and make it much more readable. which's pushed to here [2] as V1.

To avoid touching the traditional SCSI core, the HPB driver in this series HPB
patch chooses to develop under SCSI sub-system layer, and sits the same layer
with UFSHCD. At the same time, to minimize changes to UFSHCD driver, the HPB
driver submits its HPB READ BUFFER and HPB WRITE BUFFER requests to the scsi
device->request_queueu to execute, rather than that directly go through
raw UPIU request path.

1. Rebased the patch on the [3] branch 5.8/scsi-queue
1. Optimized and simplified several functions
2. Add parameter read_threshold in HPB sysfs, by which the user can change
read_threshold for the HPB host control mode
3. Add HPB memory limitation, let the user adjust its size according to the
system memory capacity


Bean Huo (5):
scsi; ufs: add device descriptor for Host Performance Booster
scsi: ufs: make ufshcd_read_unit_desc_param() non-static func
scsi: ufs: add ufs_features parameter in structure ufs_dev_info
scsi: ufs: add unit and geometry parameters for HPB
scsi: ufs: UFS Host Performance Booster(HPB) driver

drivers/scsi/ufs/Kconfig | 62 +
drivers/scsi/ufs/Makefile | 1 +
drivers/scsi/ufs/ufs.h | 15 +
drivers/scsi/ufs/ufshcd.c | 66 +-
drivers/scsi/ufs/ufshcd.h | 15 +-
drivers/scsi/ufs/ufshpb.c | 3279 +++++++++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshpb.h | 450 +++++
7 files changed, 3881 insertions(+), 7 deletions(-)
create mode 100644 drivers/scsi/ufs/ufshpb.c
create mode 100644 drivers/scsi/ufs/ufshpb.h


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