diff mbox series

[v13,1/3] scsi: ufs: Introduce HPB feature

Message ID 1796371666.41604379003890.JavaMail.epsvc@epcpadp3
State Superseded
Headers show
Series [v13,1/3] scsi: ufs: Introduce HPB feature | expand

Commit Message

Daejun Park Nov. 3, 2020, 4:46 a.m. UTC
This is a patch for the HPB feature.
This patch adds HPB function calls to UFS core driver.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Tested-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Daejun Park <daejun7.park@samsung.com>
---
 drivers/scsi/ufs/Kconfig     |   9 +
 drivers/scsi/ufs/Makefile    |   1 +
 drivers/scsi/ufs/ufs-sysfs.c |  18 ++
 drivers/scsi/ufs/ufs.h       |  13 +
 drivers/scsi/ufs/ufshcd.c    |  48 +++
 drivers/scsi/ufs/ufshcd.h    |  23 +-
 drivers/scsi/ufs/ufshpb.c    | 583 +++++++++++++++++++++++++++++++++++
 drivers/scsi/ufs/ufshpb.h    | 167 ++++++++++
 8 files changed, 861 insertions(+), 1 deletion(-)
 create mode 100644 drivers/scsi/ufs/ufshpb.c
 create mode 100644 drivers/scsi/ufs/ufshpb.h

Comments

Greg KH Dec. 7, 2020, 6:04 p.m. UTC | #1
On Tue, Nov 03, 2020 at 01:46:23PM +0900, Daejun Park wrote:
> This is a patch for the HPB feature.

> This patch adds HPB function calls to UFS core driver.


Ok, I asked if there was anything left to do, and I see some stuff here.

First off, this changelog is really really sparse.  It needs to be much
more detailed, saying what HPB is, where in the specification it is
defined, and why Linux needs to support it.

Please fill all of that out, otherwise people that do not follow UFS do
not know what this is.


> 

> Reviewed-by: Bart Van Assche <bvanassche@acm.org>

> Acked-by: Avri Altman <Avri.Altman@wdc.com>

> Tested-by: Bean Huo <beanhuo@micron.com>

> Signed-off-by: Daejun Park <daejun7.park@samsung.com>

> ---

>  drivers/scsi/ufs/Kconfig     |   9 +

>  drivers/scsi/ufs/Makefile    |   1 +

>  drivers/scsi/ufs/ufs-sysfs.c |  18 ++

>  drivers/scsi/ufs/ufs.h       |  13 +

>  drivers/scsi/ufs/ufshcd.c    |  48 +++

>  drivers/scsi/ufs/ufshcd.h    |  23 +-

>  drivers/scsi/ufs/ufshpb.c    | 583 +++++++++++++++++++++++++++++++++++

>  drivers/scsi/ufs/ufshpb.h    | 167 ++++++++++

>  8 files changed, 861 insertions(+), 1 deletion(-)

>  create mode 100644 drivers/scsi/ufs/ufshpb.c

>  create mode 100644 drivers/scsi/ufs/ufshpb.h

> 

> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig

> index dcdb4eb1f90b..fd1cf7bc0eca 100644

> --- a/drivers/scsi/ufs/Kconfig

> +++ b/drivers/scsi/ufs/Kconfig

> @@ -181,3 +181,12 @@ config SCSI_UFS_CRYPTO

>  	  Enabling this makes it possible for the kernel to use the crypto

>  	  capabilities of the UFS device (if present) to perform crypto

>  	  operations on data being transferred to/from the device.

> +

> +config SCSI_UFS_HPB

> +	bool "Support UFS Host Performance Booster"

> +	depends on SCSI_UFSHCD

> +	help

> +	  The UFS HPB feature improves random read performance. It caches

> +	  L2P (logical to physical) map of UFS to host DRAM. The driver uses HPB

> +	  read command by piggybacking physical page number for bypassing FTL (flash

> +	  translation layer)'s L2P address translation.

> diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile

> index 4679af1b564e..663e17cee359 100644

> --- a/drivers/scsi/ufs/Makefile

> +++ b/drivers/scsi/ufs/Makefile

> @@ -11,6 +11,7 @@ obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o

>  ufshcd-core-y				+= ufshcd.o ufs-sysfs.o

>  ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o

>  ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO) += ufshcd-crypto.o

> +ufshcd-core-$(CONFIG_SCSI_UFS_HPB) += ufshpb.o

>  obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o

>  obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o

>  obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o

> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c

> index bdcd27faa054..6ccda6e57c7f 100644

> --- a/drivers/scsi/ufs/ufs-sysfs.c

> +++ b/drivers/scsi/ufs/ufs-sysfs.c

> @@ -284,6 +284,8 @@ UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);

>  UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA, 1);

>  UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);

>  UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);

> +UFS_DEVICE_DESC_PARAM(hpb_version, _HPB_VER, 2);

> +UFS_DEVICE_DESC_PARAM(hpb_control, _HPB_CONTROL, 1);

>  UFS_DEVICE_DESC_PARAM(ext_feature_sup, _EXT_UFS_FEATURE_SUP, 4);

>  UFS_DEVICE_DESC_PARAM(wb_presv_us_en, _WB_PRESRV_USRSPC_EN, 1);

>  UFS_DEVICE_DESC_PARAM(wb_type, _WB_TYPE, 1);

> @@ -316,6 +318,8 @@ static struct attribute *ufs_sysfs_device_descriptor[] = {

>  	&dev_attr_number_of_secure_wpa.attr,

>  	&dev_attr_psa_max_data_size.attr,

>  	&dev_attr_psa_state_timeout.attr,

> +	&dev_attr_hpb_version.attr,

> +	&dev_attr_hpb_control.attr,


You add a bunch of new sysfs attributes, but I do not see any
Documentation/ABI/ entries for them.  Why not?  Those are required for
any new sysfs files added to the kernel.  Please fix that up when you
resend this.

> --- /dev/null

> +++ b/drivers/scsi/ufs/ufshpb.c

> @@ -0,0 +1,583 @@

> +// SPDX-License-Identifier: GPL-2.0-or-later


Do you really mean "or later"?  I have to ask, sorry.

> +/*

> + * Universal Flash Storage Host Performance Booster

> + *

> + * Copyright (C) 2017-2018 Samsung Electronics Co., Ltd.


This has not been touched since 2018?  I somehow doubt that :(


> +static void ufshpb_lu_parameter_init(struct ufs_hba *hba,

> +				     struct ufshpb_lu *hpb,

> +				     struct ufshpb_dev_info *hpb_dev_info,

> +				     struct ufshpb_lu_info *hpb_lu_info)

> +{

> +	u32 entries_per_rgn;

> +	u64 rgn_mem_size, tmp;

> +

> +	hpb->lu_pinned_start = hpb_lu_info->pinned_start;

> +	hpb->lu_pinned_end = hpb_lu_info->num_pinned ?

> +		(hpb_lu_info->pinned_start + hpb_lu_info->num_pinned - 1)

> +		: PINNED_NOT_SET;

> +

> +	rgn_mem_size = (1ULL << hpb_dev_info->rgn_size) * HPB_RGN_SIZE_UNIT

> +			* HPB_ENTRY_SIZE;

> +	do_div(rgn_mem_size, HPB_ENTRY_BLOCK_SIZE);

> +	hpb->srgn_mem_size = (1ULL << hpb_dev_info->srgn_size)

> +		* HPB_RGN_SIZE_UNIT / HPB_ENTRY_BLOCK_SIZE * HPB_ENTRY_SIZE;

> +

> +	tmp = rgn_mem_size;

> +	do_div(tmp, HPB_ENTRY_SIZE);

> +	entries_per_rgn = (u32)tmp;

> +	hpb->entries_per_rgn_shift = ilog2(entries_per_rgn);

> +	hpb->entries_per_rgn_mask = entries_per_rgn - 1;

> +

> +	hpb->entries_per_srgn = hpb->srgn_mem_size / HPB_ENTRY_SIZE;

> +	hpb->entries_per_srgn_shift = ilog2(hpb->entries_per_srgn);

> +	hpb->entries_per_srgn_mask = hpb->entries_per_srgn - 1;

> +

> +	tmp = rgn_mem_size;

> +	do_div(tmp, hpb->srgn_mem_size);

> +	hpb->srgns_per_rgn = (int)tmp;

> +

> +	hpb->rgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,

> +				entries_per_rgn);

> +	hpb->srgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,

> +				(hpb->srgn_mem_size / HPB_ENTRY_SIZE));

> +

> +	hpb->pages_per_srgn = DIV_ROUND_UP(hpb->srgn_mem_size, PAGE_SIZE);

> +

> +	dev_info(hba->dev, "ufshpb(%d): region memory size - %llu (bytes)\n",

> +		 hpb->lun, rgn_mem_size);

> +	dev_info(hba->dev, "ufshpb(%d): subregion memory size - %u (bytes)\n",

> +		 hpb->lun, hpb->srgn_mem_size);

> +	dev_info(hba->dev, "ufshpb(%d): total blocks per lu - %d\n",

> +		 hpb->lun, hpb_lu_info->num_blocks);

> +	dev_info(hba->dev, "ufshpb(%d): subregions per region - %d, regions per lu - %u\n",

> +		 hpb->lun, hpb->srgns_per_rgn, hpb->rgns_per_lu);


Why all the kernel log spam for when things are working?  Shouldn't
drivers, if all is working properly, be totally silent?  Who will do
anything with this?  Worst case, make it dev_dbg(), right?

> +/* SYSFS functions */

> +#define ufshpb_sysfs_attr_show_func(__name)				\

> +static ssize_t __name##_show(struct device *dev,			\

> +	struct device_attribute *attr, char *buf)			\

> +{									\

> +	struct scsi_device *sdev = to_scsi_device(dev);			\

> +	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);		\

> +									\

> +	if (!hpb)							\

> +		return -ENOENT;						\


How can this ever be true?

> +	return snprintf(buf, PAGE_SIZE, "%d\n",				\

> +			atomic_read(&hpb->stats.__name));		\


sysfs_emit() is nicer to use now, please use that.

And why are your stats atomic variables?  That feels like a waste and a
slow-down just for debugging stuff.  What's wrong with a simple u64?

> +void ufshpb_reset_host(struct ufs_hba *hba)

> +{

> +	struct ufshpb_lu *hpb;

> +	struct scsi_device *sdev;

> +

> +	dev_dbg(hba->dev, "ufshpb run reset_host\n");


This is what ftrace is for, no need for this here, or in many other
places you have added it, please remove.

> +void ufshpb_remove(struct ufs_hba *hba)

> +{

> +}


An empty remove function?  Are you _SURE_ that is ok?  That always is a
huge red flag to me...

> diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h

> new file mode 100644

> index 000000000000..6fa5db94bcae

> --- /dev/null

> +++ b/drivers/scsi/ufs/ufshpb.h

> @@ -0,0 +1,167 @@

> +/* SPDX-License-Identifier: GPL-2.0-or-later */


Same license question as before.

> +/*

> + * Universal Flash Storage Host Performance Booster

> + *

> + * Copyright (C) 2017-2018 Samsung Electronics Co., Ltd.


Again, date?

> + *

> + * Authors:

> + *	Yongmyung Lee <ymhungry.lee@samsung.com>

> + *	Jinyoung Choi <j-young.choi@samsung.com>

> + */

> +

> +#ifndef _UFSHPB_H_

> +#define _UFSHPB_H_

> +

> +/* hpb response UPIU macro */

> +#define HPB_RSP_NONE				0x0

> +#define	HPB_RSP_REQ_REGION_UPDATE		0x1


Why a tab after "define" on only 1 line?

thanks,

greg k-h
Daejun Park Dec. 15, 2020, 1:24 a.m. UTC | #2
Hi Greg,

> > This is a patch for the HPB feature.

> > This patch adds HPB function calls to UFS core driver.

> 

> Ok, I asked if there was anything left to do, and I see some stuff here.

> 

> First off, this changelog is really really sparse.  It needs to be much

> more detailed, saying what HPB is, where in the specification it is

> defined, and why Linux needs to support it.

> 

> Please fill all of that out, otherwise people that do not follow UFS do

> not know what this is.


OK, I will add the following description in this patch comment.

===
This is a patch for the HPB initialization and adds HPB function calls to
UFS core driver.

NAND flash-based storage devices, including UFS, have mechanisms to
translate logical addresses of IO requests to the corresponding physical
addresses of the flash storage.
In UFS, Logical-address-to-Physical-address (L2P) map data, which is
required to identify the physical address for the requested IOs, can only
be partially stored in SRAM from NAND flash. Due to this partial loading, 
accessing the flash address area where the L2P information for that address
is not loaded in the SRAM can result in serious performance degradation.

The basic concept of HPB is to cache L2P mapping entries in host system
memory so that both physical block address (PBA) and logical block address
(LBA) can be delivered in HPB read command.
The HPB READ command allows to read data faster than a read command in UFS
since it provides the physical address (HPB Entry) of the desired logical
block in addition to its logical address. The UFS device can access the
physical block in NAND directly without searching and uploading L2P mapping
table. This improves read performance because the NAND read operation for
uploading L2P mapping table is removed.

In HPB initialization, the host checks if the UFS device supports HPB
feature and retrieves related device capabilities. Then, some HPB
parameters are configured in the device.
===
> > 

> > Reviewed-by: Bart Van Assche <bvanassche@acm.org>

> > Acked-by: Avri Altman <Avri.Altman@wdc.com>

> > Tested-by: Bean Huo <beanhuo@micron.com>

> > Signed-off-by: Daejun Park <daejun7.park@samsung.com>

> > ---

> >  drivers/scsi/ufs/Kconfig     |   9 +

> >  drivers/scsi/ufs/Makefile    |   1 +

> >  drivers/scsi/ufs/ufs-sysfs.c |  18 ++

> >  drivers/scsi/ufs/ufs.h       |  13 +

> >  drivers/scsi/ufs/ufshcd.c    |  48 +++

> >  drivers/scsi/ufs/ufshcd.h    |  23 +-

> >  drivers/scsi/ufs/ufshpb.c    | 583 +++++++++++++++++++++++++++++++++++

> >  drivers/scsi/ufs/ufshpb.h    | 167 ++++++++++

> >  8 files changed, 861 insertions(+), 1 deletion(-)

> >  create mode 100644 drivers/scsi/ufs/ufshpb.c

> >  create mode 100644 drivers/scsi/ufs/ufshpb.h

> > 

> > diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig

> > index dcdb4eb1f90b..fd1cf7bc0eca 100644

> > --- a/drivers/scsi/ufs/Kconfig

> > +++ b/drivers/scsi/ufs/Kconfig

> > @@ -181,3 +181,12 @@ config SCSI_UFS_CRYPTO

> >  	  Enabling this makes it possible for the kernel to use the crypto

> >  	  capabilities of the UFS device (if present) to perform crypto

> >  	  operations on data being transferred to/from the device.

> > +

> > +config SCSI_UFS_HPB

> > +	bool "Support UFS Host Performance Booster"

> > +	depends on SCSI_UFSHCD

> > +	help

> > +	  The UFS HPB feature improves random read performance. It caches

> > +	  L2P (logical to physical) map of UFS to host DRAM. The driver uses HPB

> > +	  read command by piggybacking physical page number for bypassing FTL (flash

> > +	  translation layer)'s L2P address translation.

> > diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile

> > index 4679af1b564e..663e17cee359 100644

> > --- a/drivers/scsi/ufs/Makefile

> > +++ b/drivers/scsi/ufs/Makefile

> > @@ -11,6 +11,7 @@ obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o

> >  ufshcd-core-y				+= ufshcd.o ufs-sysfs.o

> >  ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o

> >  ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO) += ufshcd-crypto.o

> > +ufshcd-core-$(CONFIG_SCSI_UFS_HPB) += ufshpb.o

> >  obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o

> >  obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o

> >  obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o

> > diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c

> > index bdcd27faa054..6ccda6e57c7f 100644

> > --- a/drivers/scsi/ufs/ufs-sysfs.c

> > +++ b/drivers/scsi/ufs/ufs-sysfs.c

> > @@ -284,6 +284,8 @@ UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);

> >  UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA, 1);

> >  UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);

> >  UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);

> > +UFS_DEVICE_DESC_PARAM(hpb_version, _HPB_VER, 2);

> > +UFS_DEVICE_DESC_PARAM(hpb_control, _HPB_CONTROL, 1);

> >  UFS_DEVICE_DESC_PARAM(ext_feature_sup, _EXT_UFS_FEATURE_SUP, 4);

> >  UFS_DEVICE_DESC_PARAM(wb_presv_us_en, _WB_PRESRV_USRSPC_EN, 1);

> >  UFS_DEVICE_DESC_PARAM(wb_type, _WB_TYPE, 1);

> > @@ -316,6 +318,8 @@ static struct attribute *ufs_sysfs_device_descriptor[] = {

> >  	&dev_attr_number_of_secure_wpa.attr,

> >  	&dev_attr_psa_max_data_size.attr,

> >  	&dev_attr_psa_state_timeout.attr,

> > +	&dev_attr_hpb_version.attr,

> > +	&dev_attr_hpb_control.attr,

> 

> You add a bunch of new sysfs attributes, but I do not see any

> Documentation/ABI/ entries for them.  Why not?  Those are required for

> any new sysfs files added to the kernel.  Please fix that up when you

> resend this.


I will add ABI entries for them.

> > --- /dev/null

> > +++ b/drivers/scsi/ufs/ufshpb.c

> > @@ -0,0 +1,583 @@

> > +// SPDX-License-Identifier: GPL-2.0-or-later

> 

> Do you really mean "or later"?  I have to ask, sorry.


I will change this: "// SPDX-License-Identifier: GPL-2.0"

> > +/*

> > + * Universal Flash Storage Host Performance Booster

> > + *

> > + * Copyright (C) 2017-2018 Samsung Electronics Co., Ltd.

> 

> This has not been touched since 2018?  I somehow doubt that :(

> 


It will be changed to "2017-2020".

> > +static void ufshpb_lu_parameter_init(struct ufs_hba *hba,

> > +				     struct ufshpb_lu *hpb,

> > +				     struct ufshpb_dev_info *hpb_dev_info,

> > +				     struct ufshpb_lu_info *hpb_lu_info)

> > +{

> > +	u32 entries_per_rgn;

> > +	u64 rgn_mem_size, tmp;

> > +

> > +	hpb->lu_pinned_start = hpb_lu_info->pinned_start;

> > +	hpb->lu_pinned_end = hpb_lu_info->num_pinned ?

> > +		(hpb_lu_info->pinned_start + hpb_lu_info->num_pinned - 1)

> > +		: PINNED_NOT_SET;

> > +

> > +	rgn_mem_size = (1ULL << hpb_dev_info->rgn_size) * HPB_RGN_SIZE_UNIT

> > +			* HPB_ENTRY_SIZE;

> > +	do_div(rgn_mem_size, HPB_ENTRY_BLOCK_SIZE);

> > +	hpb->srgn_mem_size = (1ULL << hpb_dev_info->srgn_size)

> > +		* HPB_RGN_SIZE_UNIT / HPB_ENTRY_BLOCK_SIZE * HPB_ENTRY_SIZE;

> > +

> > +	tmp = rgn_mem_size;

> > +	do_div(tmp, HPB_ENTRY_SIZE);

> > +	entries_per_rgn = (u32)tmp;

> > +	hpb->entries_per_rgn_shift = ilog2(entries_per_rgn);

> > +	hpb->entries_per_rgn_mask = entries_per_rgn - 1;

> > +

> > +	hpb->entries_per_srgn = hpb->srgn_mem_size / HPB_ENTRY_SIZE;

> > +	hpb->entries_per_srgn_shift = ilog2(hpb->entries_per_srgn);

> > +	hpb->entries_per_srgn_mask = hpb->entries_per_srgn - 1;

> > +

> > +	tmp = rgn_mem_size;

> > +	do_div(tmp, hpb->srgn_mem_size);

> > +	hpb->srgns_per_rgn = (int)tmp;

> > +

> > +	hpb->rgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,

> > +				entries_per_rgn);

> > +	hpb->srgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,

> > +				(hpb->srgn_mem_size / HPB_ENTRY_SIZE));

> > +

> > +	hpb->pages_per_srgn = DIV_ROUND_UP(hpb->srgn_mem_size, PAGE_SIZE);

> > +

> > +	dev_info(hba->dev, "ufshpb(%d): region memory size - %llu (bytes)\n",

> > +		 hpb->lun, rgn_mem_size);

> > +	dev_info(hba->dev, "ufshpb(%d): subregion memory size - %u (bytes)\n",

> > +		 hpb->lun, hpb->srgn_mem_size);

> > +	dev_info(hba->dev, "ufshpb(%d): total blocks per lu - %d\n",

> > +		 hpb->lun, hpb_lu_info->num_blocks);

> > +	dev_info(hba->dev, "ufshpb(%d): subregions per region - %d, regions per lu - %u\n",

> > +		 hpb->lun, hpb->srgns_per_rgn, hpb->rgns_per_lu);

> 

> Why all the kernel log spam for when things are working?  Shouldn't

> drivers, if all is working properly, be totally silent?  Who will do

> anything with this?  Worst case, make it dev_dbg(), right?


I will delete these message because it is used for debugging.

> > +/* SYSFS functions */

> > +#define ufshpb_sysfs_attr_show_func(__name)				\

> > +static ssize_t __name##_show(struct device *dev,			\

> > +	struct device_attribute *attr, char *buf)			\

> > +{									\

> > +	struct scsi_device *sdev = to_scsi_device(dev);			\

> > +	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);		\

> > +									\

> > +	if (!hpb)							\

> > +		return -ENOENT;						\

> 

> How can this ever be true?


I think it can be removed.

> > +	return snprintf(buf, PAGE_SIZE, "%d\n",				\

> > +			atomic_read(&hpb->stats.__name));		\

> 

> sysfs_emit() is nicer to use now, please use that.


OK,

> And why are your stats atomic variables?  That feels like a waste and a

> slow-down just for debugging stuff.  What's wrong with a simple u64?


OK, I will change these variables as simple u64.

> > +void ufshpb_reset_host(struct ufs_hba *hba)

> > +{

> > +	struct ufshpb_lu *hpb;

> > +	struct scsi_device *sdev;

> > +

> > +	dev_dbg(hba->dev, "ufshpb run reset_host\n");

> 

> This is what ftrace is for, no need for this here, or in many other

> places you have added it, please remove.


OK, I will remove.

> > +void ufshpb_remove(struct ufs_hba *hba)

> > +{

> > +}

> 

> An empty remove function?  Are you _SURE_ that is ok?  That always is a

> huge red flag to me...


OK, I will remove it.

> > diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h

> > new file mode 100644

> > index 000000000000..6fa5db94bcae

> > --- /dev/null

> > +++ b/drivers/scsi/ufs/ufshpb.h

> > @@ -0,0 +1,167 @@

> > +/* SPDX-License-Identifier: GPL-2.0-or-later */

> 

> Same license question as before.


OK,

> > +/*

> > + * Universal Flash Storage Host Performance Booster

> > + *

> > + * Copyright (C) 2017-2018 Samsung Electronics Co., Ltd.

> 

> Again, date?


OK,

> > + *

> > + * Authors:

> > + *	Yongmyung Lee <ymhungry.lee@samsung.com>

> > + *	Jinyoung Choi <j-young.choi@samsung.com>

> > + */

> > +

> > +#ifndef _UFSHPB_H_

> > +#define _UFSHPB_H_

> > +

> > +/* hpb response UPIU macro */

> > +#define HPB_RSP_NONE				0x0

> > +#define	HPB_RSP_REQ_REGION_UPDATE		0x1

> 

> Why a tab after "define" on only 1 line?


I will fix it.

Thanks,
Daejun
diff mbox series

Patch

diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index dcdb4eb1f90b..fd1cf7bc0eca 100644
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -181,3 +181,12 @@  config SCSI_UFS_CRYPTO
 	  Enabling this makes it possible for the kernel to use the crypto
 	  capabilities of the UFS device (if present) to perform crypto
 	  operations on data being transferred to/from the device.
+
+config SCSI_UFS_HPB
+	bool "Support UFS Host Performance Booster"
+	depends on SCSI_UFSHCD
+	help
+	  The UFS HPB feature improves random read performance. It caches
+	  L2P (logical to physical) map of UFS to host DRAM. The driver uses HPB
+	  read command by piggybacking physical page number for bypassing FTL (flash
+	  translation layer)'s L2P address translation.
diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
index 4679af1b564e..663e17cee359 100644
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -11,6 +11,7 @@  obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
 ufshcd-core-y				+= ufshcd.o ufs-sysfs.o
 ufshcd-core-$(CONFIG_SCSI_UFS_BSG)	+= ufs_bsg.o
 ufshcd-core-$(CONFIG_SCSI_UFS_CRYPTO) += ufshcd-crypto.o
+ufshcd-core-$(CONFIG_SCSI_UFS_HPB) += ufshpb.o
 obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
 obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
 obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index bdcd27faa054..6ccda6e57c7f 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -284,6 +284,8 @@  UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);
 UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA, 1);
 UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);
 UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);
+UFS_DEVICE_DESC_PARAM(hpb_version, _HPB_VER, 2);
+UFS_DEVICE_DESC_PARAM(hpb_control, _HPB_CONTROL, 1);
 UFS_DEVICE_DESC_PARAM(ext_feature_sup, _EXT_UFS_FEATURE_SUP, 4);
 UFS_DEVICE_DESC_PARAM(wb_presv_us_en, _WB_PRESRV_USRSPC_EN, 1);
 UFS_DEVICE_DESC_PARAM(wb_type, _WB_TYPE, 1);
@@ -316,6 +318,8 @@  static struct attribute *ufs_sysfs_device_descriptor[] = {
 	&dev_attr_number_of_secure_wpa.attr,
 	&dev_attr_psa_max_data_size.attr,
 	&dev_attr_psa_state_timeout.attr,
+	&dev_attr_hpb_version.attr,
+	&dev_attr_hpb_control.attr,
 	&dev_attr_ext_feature_sup.attr,
 	&dev_attr_wb_presv_us_en.attr,
 	&dev_attr_wb_type.attr,
@@ -389,6 +393,10 @@  UFS_GEOMETRY_DESC_PARAM(enh4_memory_max_alloc_units,
 	_ENM4_MAX_NUM_UNITS, 4);
 UFS_GEOMETRY_DESC_PARAM(enh4_memory_capacity_adjustment_factor,
 	_ENM4_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(hpb_region_size, _HPB_REGION_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(hpb_number_lu, _HPB_NUMBER_LU, 1);
+UFS_GEOMETRY_DESC_PARAM(hpb_subregion_size, _HPB_SUBREGION_SIZE, 1);
+UFS_GEOMETRY_DESC_PARAM(hpb_max_active_regions, _HPB_MAX_ACTIVE_REGS, 2);
 UFS_GEOMETRY_DESC_PARAM(wb_max_alloc_units, _WB_MAX_ALLOC_UNITS, 4);
 UFS_GEOMETRY_DESC_PARAM(wb_max_wb_luns, _WB_MAX_WB_LUNS, 1);
 UFS_GEOMETRY_DESC_PARAM(wb_buff_cap_adj, _WB_BUFF_CAP_ADJ, 1);
@@ -426,6 +434,10 @@  static struct attribute *ufs_sysfs_geometry_descriptor[] = {
 	&dev_attr_enh3_memory_capacity_adjustment_factor.attr,
 	&dev_attr_enh4_memory_max_alloc_units.attr,
 	&dev_attr_enh4_memory_capacity_adjustment_factor.attr,
+	&dev_attr_hpb_region_size.attr,
+	&dev_attr_hpb_number_lu.attr,
+	&dev_attr_hpb_subregion_size.attr,
+	&dev_attr_hpb_max_active_regions.attr,
 	&dev_attr_wb_max_alloc_units.attr,
 	&dev_attr_wb_max_wb_luns.attr,
 	&dev_attr_wb_buff_cap_adj.attr,
@@ -808,6 +820,9 @@  UFS_UNIT_DESC_PARAM(provisioning_type, _PROVISIONING_TYPE, 1);
 UFS_UNIT_DESC_PARAM(physical_memory_resourse_count, _PHY_MEM_RSRC_CNT, 8);
 UFS_UNIT_DESC_PARAM(context_capabilities, _CTX_CAPABILITIES, 2);
 UFS_UNIT_DESC_PARAM(large_unit_granularity, _LARGE_UNIT_SIZE_M1, 1);
+UFS_UNIT_DESC_PARAM(hpb_lu_max_active_regions, _HPB_LU_MAX_ACTIVE_RGNS, 2);
+UFS_UNIT_DESC_PARAM(hpb_pinned_region_start_offset, _HPB_PIN_RGN_START_OFF, 2);
+UFS_UNIT_DESC_PARAM(hpb_number_pinned_regions, _HPB_NUM_PIN_RGNS, 2);
 UFS_UNIT_DESC_PARAM(wb_buf_alloc_units, _WB_BUF_ALLOC_UNITS, 4);
 
 
@@ -825,6 +840,9 @@  static struct attribute *ufs_sysfs_unit_descriptor[] = {
 	&dev_attr_physical_memory_resourse_count.attr,
 	&dev_attr_context_capabilities.attr,
 	&dev_attr_large_unit_granularity.attr,
+	&dev_attr_hpb_lu_max_active_regions.attr,
+	&dev_attr_hpb_pinned_region_start_offset.attr,
+	&dev_attr_hpb_number_pinned_regions.attr,
 	&dev_attr_wb_buf_alloc_units.attr,
 	NULL,
 };
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index f8ab16f30fdc..94deabb0ad36 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -122,6 +122,7 @@  enum flag_idn {
 	QUERY_FLAG_IDN_WB_EN                            = 0x0E,
 	QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN                 = 0x0F,
 	QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8     = 0x10,
+	QUERY_FLAG_IDN_HPB_RESET                        = 0x11,
 };
 
 /* Attribute idn for Query requests */
@@ -195,6 +196,9 @@  enum unit_desc_param {
 	UNIT_DESC_PARAM_PHY_MEM_RSRC_CNT	= 0x18,
 	UNIT_DESC_PARAM_CTX_CAPABILITIES	= 0x20,
 	UNIT_DESC_PARAM_LARGE_UNIT_SIZE_M1	= 0x22,
+	UNIT_DESC_PARAM_HPB_LU_MAX_ACTIVE_RGNS	= 0x23,
+	UNIT_DESC_PARAM_HPB_PIN_RGN_START_OFF	= 0x25,
+	UNIT_DESC_PARAM_HPB_NUM_PIN_RGNS	= 0x27,
 	UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS	= 0x29,
 };
 
@@ -235,6 +239,8 @@  enum device_desc_param {
 	DEVICE_DESC_PARAM_PSA_MAX_DATA		= 0x25,
 	DEVICE_DESC_PARAM_PSA_TMT		= 0x29,
 	DEVICE_DESC_PARAM_PRDCT_REV		= 0x2A,
+	DEVICE_DESC_PARAM_HPB_VER		= 0x40,
+	DEVICE_DESC_PARAM_HPB_CONTROL		= 0x42,
 	DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP	= 0x4F,
 	DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN	= 0x53,
 	DEVICE_DESC_PARAM_WB_TYPE		= 0x54,
@@ -283,6 +289,10 @@  enum geometry_desc_param {
 	GEOMETRY_DESC_PARAM_ENM4_MAX_NUM_UNITS	= 0x3E,
 	GEOMETRY_DESC_PARAM_ENM4_CAP_ADJ_FCTR	= 0x42,
 	GEOMETRY_DESC_PARAM_OPT_LOG_BLK_SIZE	= 0x44,
+	GEOMETRY_DESC_PARAM_HPB_REGION_SIZE	= 0x48,
+	GEOMETRY_DESC_PARAM_HPB_NUMBER_LU	= 0x49,
+	GEOMETRY_DESC_PARAM_HPB_SUBREGION_SIZE	= 0x4A,
+	GEOMETRY_DESC_PARAM_HPB_MAX_ACTIVE_REGS	= 0x4B,
 	GEOMETRY_DESC_PARAM_WB_MAX_ALLOC_UNITS	= 0x4F,
 	GEOMETRY_DESC_PARAM_WB_MAX_WB_LUNS	= 0x53,
 	GEOMETRY_DESC_PARAM_WB_BUFF_CAP_ADJ	= 0x54,
@@ -327,8 +337,10 @@  enum {
 
 /* Possible values for dExtendedUFSFeaturesSupport */
 enum {
+	UFS_DEV_HPB_SUPPORT		= BIT(7),
 	UFS_DEV_WRITE_BOOSTER_SUP	= BIT(8),
 };
+#define UFS_DEV_HPB_SUPPORT_VERSION		0x310
 
 #define POWER_DESC_MAX_SIZE			0x62
 #define POWER_DESC_MAX_ACTV_ICC_LVLS		16
@@ -537,6 +549,7 @@  struct ufs_dev_info {
 	u8 *model;
 	u16 wspecversion;
 	u32 clk_gating_wait_us;
+	u8 b_ufs_feature_sup;
 	u32 d_ext_ufs_feature_sup;
 	u8 b_wb_buffer_type;
 	u32 d_wb_alloc_units;
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b8f573a02713..77a970522e24 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -22,6 +22,7 @@ 
 #include "ufs-sysfs.h"
 #include "ufs_bsg.h"
 #include "ufshcd-crypto.h"
+#include "ufshpb.h"
 #include <asm/unaligned.h>
 #include <linux/blkdev.h>
 
@@ -4702,6 +4703,26 @@  static int ufshcd_change_queue_depth(struct scsi_device *sdev, int depth)
 	return scsi_change_queue_depth(sdev, depth);
 }
 
+static void ufshcd_hpb_destroy(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	/* skip well-known LU */
+	if ((sdev->lun >= UFS_UPIU_MAX_UNIT_NUM_ID) || !ufshpb_is_allowed(hba))
+		return;
+
+	ufshpb_destroy_lu(hba, sdev);
+}
+
+static void ufshcd_hpb_configure(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	/* skip well-known LU */
+	if ((sdev->lun >= UFS_UPIU_MAX_UNIT_NUM_ID) ||
+	    !(hba->dev_info.b_ufs_feature_sup & UFS_DEV_HPB_SUPPORT) ||
+	    !ufshpb_is_allowed(hba))
+		return;
+
+	ufshpb_init_hpb_lu(hba, sdev);
+}
+
 /**
  * ufshcd_slave_configure - adjust SCSI device configurations
  * @sdev: pointer to SCSI device
@@ -4711,6 +4732,8 @@  static int ufshcd_slave_configure(struct scsi_device *sdev)
 	struct ufs_hba *hba = shost_priv(sdev->host);
 	struct request_queue *q = sdev->request_queue;
 
+	ufshcd_hpb_configure(hba, sdev);
+
 	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
 
 	if (ufshcd_is_rpm_autosuspend_allowed(hba))
@@ -4730,6 +4753,9 @@  static void ufshcd_slave_destroy(struct scsi_device *sdev)
 	struct ufs_hba *hba;
 
 	hba = shost_priv(sdev->host);
+
+	ufshcd_hpb_destroy(hba, sdev);
+
 	/* Drop the reference as it won't be needed anymore */
 	if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN) {
 		unsigned long flags;
@@ -6789,6 +6815,8 @@  static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
 	 * Stop the host controller and complete the requests
 	 * cleared by h/w
 	 */
+	ufshpb_reset_host(hba);
+
 	ufshcd_hba_stop(hba);
 
 	spin_lock_irqsave(hba->host->host_lock, flags);
@@ -7224,9 +7252,14 @@  static int ufs_get_device_desc(struct ufs_hba *hba)
 	/* getting Specification Version in big endian format */
 	dev_info->wspecversion = desc_buf[DEVICE_DESC_PARAM_SPEC_VER] << 8 |
 				      desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1];
+	dev_info->b_ufs_feature_sup = desc_buf[DEVICE_DESC_PARAM_UFS_FEAT];
 
 	model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];
 
+	if (dev_info->wspecversion >= UFS_DEV_HPB_SUPPORT_VERSION &&
+	    (dev_info->b_ufs_feature_sup & UFS_DEV_HPB_SUPPORT))
+		ufshpb_get_dev_info(hba, desc_buf);
+
 	err = ufshcd_read_string_desc(hba, model_index,
 				      &dev_info->model, SD_ASCII_STD);
 	if (err < 0) {
@@ -7455,6 +7488,10 @@  static int ufshcd_device_geo_params_init(struct ufs_hba *hba)
 	else if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 0)
 		hba->dev_info.max_lu_supported = 8;
 
+	if (hba->desc_size[QUERY_DESC_IDN_GEOMETRY] >=
+		GEOMETRY_DESC_PARAM_HPB_MAX_ACTIVE_REGS)
+		ufshpb_get_geo_info(hba, desc_buf);
+
 out:
 	kfree(desc_buf);
 	return err;
@@ -7594,6 +7631,7 @@  static int ufshcd_add_lus(struct ufs_hba *hba)
 	}
 
 	ufs_bsg_probe(hba);
+	ufshpb_init(hba);
 	scsi_scan_host(hba->host);
 	pm_runtime_put_sync(hba->dev);
 
@@ -7680,6 +7718,7 @@  static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
 	/* Enable Auto-Hibernate if configured */
 	ufshcd_auto_hibern8_enable(hba);
 
+	ufshpb_reset(hba);
 out:
 	spin_lock_irqsave(hba->host->host_lock, flags);
 	if (ret)
@@ -7726,6 +7765,9 @@  static void ufshcd_async_scan(void *data, async_cookie_t cookie)
 static const struct attribute_group *ufshcd_driver_groups[] = {
 	&ufs_sysfs_unit_descriptor_group,
 	&ufs_sysfs_lun_attributes_group,
+#ifdef CONFIG_SCSI_UFS_HPB
+	&ufs_sysfs_hpb_stat_group,
+#endif
 	NULL,
 };
 
@@ -8449,6 +8491,8 @@  static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		req_link_state = UIC_LINK_OFF_STATE;
 	}
 
+	ufshpb_suspend(hba);
+
 	/*
 	 * If we can't transition into any of the low power modes
 	 * just gate the clocks.
@@ -8573,6 +8617,7 @@  static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	hba->clk_gating.is_suspended = false;
 	hba->dev_info.b_rpm_dev_flush_capable = false;
 	ufshcd_release(hba);
+	ufshpb_resume(hba);
 out:
 	if (hba->dev_info.b_rpm_dev_flush_capable) {
 		schedule_delayed_work(&hba->rpm_dev_flush_recheck_work,
@@ -8672,6 +8717,8 @@  static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 	/* Enable Auto-Hibernate if configured */
 	ufshcd_auto_hibern8_enable(hba);
 
+	ufshpb_resume(hba);
+
 	if (hba->dev_info.b_rpm_dev_flush_capable) {
 		hba->dev_info.b_rpm_dev_flush_capable = false;
 		cancel_delayed_work(&hba->rpm_dev_flush_recheck_work);
@@ -8901,6 +8948,7 @@  EXPORT_SYMBOL(ufshcd_shutdown);
 void ufshcd_remove(struct ufs_hba *hba)
 {
 	ufs_bsg_remove(hba);
+	ufshpb_remove(hba);
 	ufs_sysfs_remove_nodes(hba->dev);
 	blk_cleanup_queue(hba->tmf_queue);
 	blk_mq_free_tag_set(&hba->tmf_tag_set);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 47eb1430274c..ed5fbe0fa121 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -601,6 +601,25 @@  struct ufs_hba_variant_params {
 	u32 wb_flush_threshold;
 };
 
+#ifdef CONFIG_SCSI_UFS_HPB
+/**
+ * struct ufshpb_dev_info - UFSHPB device related info
+ * @num_lu: the number of user logical unit to check whether all lu finished
+ *          initialization
+ * @rgn_size: device reported HPB region size
+ * @srgn_size: device reported HPB sub-region size
+ * @slave_conf_cnt: counter to check all lu finished initialization
+ * @hpb_disabled: flag to check if HPB is disabled
+ */
+struct ufshpb_dev_info {
+	int num_lu;
+	int rgn_size;
+	int srgn_size;
+	atomic_t slave_conf_cnt;
+	bool hpb_disabled;
+};
+#endif
+
 /**
  * struct ufs_hba - per adapter private structure
  * @mmio_base: UFSHCI base register address
@@ -784,7 +803,9 @@  struct ufs_hba {
 	bool wb_buf_flush_enabled;
 	bool wb_enabled;
 	struct delayed_work rpm_dev_flush_recheck_work;
-
+#ifdef CONFIG_SCSI_UFS_HPB
+	struct ufshpb_dev_info ufshpb_dev;
+#endif
 #ifdef CONFIG_SCSI_UFS_CRYPTO
 	union ufs_crypto_capabilities crypto_capabilities;
 	union ufs_crypto_cap_entry *crypto_cap_array;
diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
new file mode 100644
index 000000000000..f3b2eef41b19
--- /dev/null
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -0,0 +1,583 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Universal Flash Storage Host Performance Booster
+ *
+ * Copyright (C) 2017-2018 Samsung Electronics Co., Ltd.
+ *
+ * Authors:
+ *	Yongmyung Lee <ymhungry.lee@samsung.com>
+ *	Jinyoung Choi <j-young.choi@samsung.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/async.h>
+
+#include "ufshcd.h"
+#include "ufshpb.h"
+#include "../sd.h"
+
+bool ufshpb_is_allowed(struct ufs_hba *hba)
+{
+	return !(hba->ufshpb_dev.hpb_disabled);
+}
+
+static struct ufshpb_lu *ufshpb_get_hpb_data(struct scsi_device * sdev)
+{
+	return sdev->hostdata;
+}
+
+static int ufshpb_get_state(struct ufshpb_lu *hpb)
+{
+	return atomic_read(&hpb->hpb_state);
+}
+
+static void ufshpb_set_state(struct ufshpb_lu *hpb, int state)
+{
+	atomic_set(&hpb->hpb_state, state);
+}
+
+static void ufshpb_init_subregion_tbl(struct ufshpb_lu *hpb,
+				      struct ufshpb_region *rgn)
+{
+	int srgn_idx;
+
+	for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+		struct ufshpb_subregion *srgn = rgn->srgn_tbl + srgn_idx;
+
+		srgn->rgn_idx = rgn->rgn_idx;
+		srgn->srgn_idx = srgn_idx;
+		srgn->srgn_state = HPB_SRGN_UNUSED;
+	}
+}
+
+static int ufshpb_alloc_subregion_tbl(struct ufshpb_lu *hpb,
+					     struct ufshpb_region *rgn,
+					     int srgn_cnt)
+{
+	rgn->srgn_tbl = kvcalloc(srgn_cnt, sizeof(struct ufshpb_subregion),
+				 GFP_KERNEL);
+	if (!rgn->srgn_tbl)
+		return -ENOMEM;
+
+	rgn->srgn_cnt = srgn_cnt;
+	return 0;
+}
+
+static void ufshpb_lu_parameter_init(struct ufs_hba *hba,
+				     struct ufshpb_lu *hpb,
+				     struct ufshpb_dev_info *hpb_dev_info,
+				     struct ufshpb_lu_info *hpb_lu_info)
+{
+	u32 entries_per_rgn;
+	u64 rgn_mem_size, tmp;
+
+	hpb->lu_pinned_start = hpb_lu_info->pinned_start;
+	hpb->lu_pinned_end = hpb_lu_info->num_pinned ?
+		(hpb_lu_info->pinned_start + hpb_lu_info->num_pinned - 1)
+		: PINNED_NOT_SET;
+
+	rgn_mem_size = (1ULL << hpb_dev_info->rgn_size) * HPB_RGN_SIZE_UNIT
+			* HPB_ENTRY_SIZE;
+	do_div(rgn_mem_size, HPB_ENTRY_BLOCK_SIZE);
+	hpb->srgn_mem_size = (1ULL << hpb_dev_info->srgn_size)
+		* HPB_RGN_SIZE_UNIT / HPB_ENTRY_BLOCK_SIZE * HPB_ENTRY_SIZE;
+
+	tmp = rgn_mem_size;
+	do_div(tmp, HPB_ENTRY_SIZE);
+	entries_per_rgn = (u32)tmp;
+	hpb->entries_per_rgn_shift = ilog2(entries_per_rgn);
+	hpb->entries_per_rgn_mask = entries_per_rgn - 1;
+
+	hpb->entries_per_srgn = hpb->srgn_mem_size / HPB_ENTRY_SIZE;
+	hpb->entries_per_srgn_shift = ilog2(hpb->entries_per_srgn);
+	hpb->entries_per_srgn_mask = hpb->entries_per_srgn - 1;
+
+	tmp = rgn_mem_size;
+	do_div(tmp, hpb->srgn_mem_size);
+	hpb->srgns_per_rgn = (int)tmp;
+
+	hpb->rgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,
+				entries_per_rgn);
+	hpb->srgns_per_lu = DIV_ROUND_UP(hpb_lu_info->num_blocks,
+				(hpb->srgn_mem_size / HPB_ENTRY_SIZE));
+
+	hpb->pages_per_srgn = DIV_ROUND_UP(hpb->srgn_mem_size, PAGE_SIZE);
+
+	dev_info(hba->dev, "ufshpb(%d): region memory size - %llu (bytes)\n",
+		 hpb->lun, rgn_mem_size);
+	dev_info(hba->dev, "ufshpb(%d): subregion memory size - %u (bytes)\n",
+		 hpb->lun, hpb->srgn_mem_size);
+	dev_info(hba->dev, "ufshpb(%d): total blocks per lu - %d\n",
+		 hpb->lun, hpb_lu_info->num_blocks);
+	dev_info(hba->dev, "ufshpb(%d): subregions per region - %d, regions per lu - %u\n",
+		 hpb->lun, hpb->srgns_per_rgn, hpb->rgns_per_lu);
+}
+
+static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
+{
+	struct ufshpb_region *rgn_table, *rgn;
+	int rgn_idx, i;
+	int ret = 0;
+
+	rgn_table = kvcalloc(hpb->rgns_per_lu, sizeof(struct ufshpb_region),
+			    GFP_KERNEL);
+	if (!rgn_table)
+		return -ENOMEM;
+
+	hpb->rgn_tbl = rgn_table;
+
+	for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
+		int srgn_cnt = hpb->srgns_per_rgn;
+
+		rgn = rgn_table + rgn_idx;
+		rgn->rgn_idx = rgn_idx;
+
+		if (rgn_idx == hpb->rgns_per_lu - 1)
+			srgn_cnt = ((hpb->srgns_per_lu - 1) %
+				    hpb->srgns_per_rgn) + 1;
+
+		ret = ufshpb_alloc_subregion_tbl(hpb, rgn, srgn_cnt);
+		if (ret)
+			goto release_srgn_table;
+		ufshpb_init_subregion_tbl(hpb, rgn);
+
+		rgn->rgn_state = HPB_RGN_INACTIVE;
+	}
+
+	return 0;
+
+release_srgn_table:
+	for (i = 0; i < rgn_idx; i++) {
+		rgn = rgn_table + i;
+		if (rgn->srgn_tbl)
+			kvfree(rgn->srgn_tbl);
+	}
+	kvfree(rgn_table);
+	return ret;
+}
+
+static void ufshpb_destroy_subregion_tbl(struct ufshpb_lu *hpb,
+					 struct ufshpb_region *rgn)
+{
+	int srgn_idx;
+
+	for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
+		struct ufshpb_subregion *srgn;
+
+		srgn = rgn->srgn_tbl + srgn_idx;
+		srgn->srgn_state = HPB_SRGN_UNUSED;
+	}
+}
+
+static void ufshpb_destroy_region_tbl(struct ufshpb_lu *hpb)
+{
+	int rgn_idx;
+
+	for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
+		struct ufshpb_region *rgn;
+
+		rgn = hpb->rgn_tbl + rgn_idx;
+		if (rgn->rgn_state != HPB_RGN_INACTIVE) {
+			rgn->rgn_state = HPB_RGN_INACTIVE;
+
+			ufshpb_destroy_subregion_tbl(hpb, rgn);
+		}
+
+		kvfree(rgn->srgn_tbl);
+	}
+
+	kvfree(hpb->rgn_tbl);
+}
+
+/* SYSFS functions */
+#define ufshpb_sysfs_attr_show_func(__name)				\
+static ssize_t __name##_show(struct device *dev,			\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct scsi_device *sdev = to_scsi_device(dev);			\
+	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);		\
+									\
+	if (!hpb)							\
+		return -ENOENT;						\
+	return snprintf(buf, PAGE_SIZE, "%d\n",				\
+			atomic_read(&hpb->stats.__name));		\
+}									\
+\
+static DEVICE_ATTR_RO(__name)
+
+ufshpb_sysfs_attr_show_func(hit_cnt);
+ufshpb_sysfs_attr_show_func(miss_cnt);
+ufshpb_sysfs_attr_show_func(rb_noti_cnt);
+ufshpb_sysfs_attr_show_func(rb_active_cnt);
+ufshpb_sysfs_attr_show_func(rb_inactive_cnt);
+ufshpb_sysfs_attr_show_func(map_req_cnt);
+
+static struct attribute *hpb_dev_attrs[] = {
+	&dev_attr_hit_cnt.attr,
+	&dev_attr_miss_cnt.attr,
+	&dev_attr_rb_noti_cnt.attr,
+	&dev_attr_rb_active_cnt.attr,
+	&dev_attr_rb_inactive_cnt.attr,
+	&dev_attr_map_req_cnt.attr,
+	NULL,
+};
+
+struct attribute_group ufs_sysfs_hpb_stat_group = {
+	.name = "hpb_sysfs",
+	.attrs = hpb_dev_attrs,
+};
+
+static void ufshpb_stat_init(struct ufshpb_lu *hpb)
+{
+	atomic_set(&hpb->stats.hit_cnt, 0);
+	atomic_set(&hpb->stats.miss_cnt, 0);
+	atomic_set(&hpb->stats.rb_noti_cnt, 0);
+	atomic_set(&hpb->stats.rb_active_cnt, 0);
+	atomic_set(&hpb->stats.rb_inactive_cnt, 0);
+	atomic_set(&hpb->stats.map_req_cnt, 0);
+}
+
+static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb)
+{
+	int ret;
+
+	spin_lock_init(&hpb->hpb_state_lock);
+
+	ret = ufshpb_alloc_region_tbl(hba, hpb);
+
+	ufshpb_stat_init(hpb);
+
+	return 0;
+}
+
+static struct ufshpb_lu *ufshpb_alloc_hpb_lu(struct ufs_hba *hba, int lun,
+				     struct ufshpb_dev_info *hpb_dev_info,
+				     struct ufshpb_lu_info *hpb_lu_info)
+{
+	struct ufshpb_lu *hpb;
+	int ret;
+
+	hpb = kzalloc(sizeof(struct ufshpb_lu), GFP_KERNEL);
+	if (!hpb)
+		return NULL;
+
+	hpb->lun = lun;
+
+	ufshpb_lu_parameter_init(hba, hpb, hpb_dev_info, hpb_lu_info);
+
+	ret = ufshpb_lu_hpb_init(hba, hpb);
+	if (ret) {
+		dev_err(hba->dev, "hpb lu init failed. ret %d", ret);
+		goto release_hpb;
+	}
+
+	return hpb;
+
+release_hpb:
+	kfree(hpb);
+	return NULL;
+}
+
+static bool ufshpb_check_hpb_reset_query(struct ufs_hba *hba)
+{
+	int err = 0;
+	bool flag_res = true;
+	int try;
+
+	/* wait for the device to complete HPB reset query */
+	for (try = 0; try < HPB_RESET_REQ_RETRIES; try++) {
+		dev_dbg(hba->dev,
+			"%s start flag reset polling %d times\n",
+			__func__, try);
+
+		/* Poll fHpbReset flag to be cleared */
+		err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
+				QUERY_FLAG_IDN_HPB_RESET, 0, &flag_res);
+
+		if (err) {
+			dev_err(hba->dev,
+				"%s reading fHpbReset flag failed with error %d\n",
+				__func__, err);
+			return flag_res;
+		}
+
+		if (!flag_res)
+			goto out;
+
+		usleep_range(1000, 1100);
+	}
+	if (flag_res) {
+		dev_err(hba->dev,
+			"%s fHpbReset was not cleared by the device\n",
+			__func__);
+	}
+out:
+	return flag_res;
+}
+
+void ufshpb_reset(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = sdev->hostdata;
+		if (!hpb)
+			continue;
+
+		if (ufshpb_get_state(hpb) != HPB_RESET)
+			continue;
+
+		ufshpb_set_state(hpb, HPB_PRESENT);
+	}
+}
+
+void ufshpb_reset_host(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	dev_dbg(hba->dev, "ufshpb run reset_host\n");
+	shost_for_each_device(sdev, hba->host) {
+		hpb = sdev->hostdata;
+		if (!hpb)
+			continue;
+
+		if (ufshpb_get_state(hpb) != HPB_PRESENT)
+			continue;
+		ufshpb_set_state(hpb, HPB_RESET);
+	}
+}
+
+void ufshpb_suspend(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	dev_dbg(hba->dev, "ufshpb goto suspend\n");
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = sdev->hostdata;
+		if (!hpb)
+			continue;
+
+		if (ufshpb_get_state(hpb) != HPB_PRESENT)
+			continue;
+		ufshpb_set_state(hpb, HPB_SUSPEND);
+	}
+}
+
+void ufshpb_resume(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+
+	dev_dbg(hba->dev, "ufshpb resume\n");
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = sdev->hostdata;
+		if (!hpb)
+			continue;
+
+		if ((ufshpb_get_state(hpb) != HPB_PRESENT) &&
+		    (ufshpb_get_state(hpb) != HPB_SUSPEND))
+			continue;
+		ufshpb_set_state(hpb, HPB_PRESENT);
+	}
+}
+
+static int ufshpb_get_lu_info(struct ufs_hba *hba, int lun,
+				    struct ufshpb_lu_info *hpb_lu_info)
+{
+	u16 max_active_rgns;
+	u8 lu_enable;
+	int size;
+	int ret;
+	char desc_buf[QUERY_DESC_MAX_SIZE];
+
+	ufshcd_map_desc_id_to_length(hba, QUERY_DESC_IDN_UNIT, &size);
+
+	pm_runtime_get_sync(hba->dev);
+	ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
+					    QUERY_DESC_IDN_UNIT, lun, 0,
+					    desc_buf, &size);
+	pm_runtime_put_sync(hba->dev);
+
+	if (ret) {
+		dev_err(hba->dev,
+			"%s: idn: %d lun: %d  query request failed",
+			__func__, QUERY_DESC_IDN_UNIT, lun);
+		return ret;
+	}
+
+	lu_enable = desc_buf[UNIT_DESC_PARAM_LU_ENABLE];
+	if (lu_enable != LU_ENABLED_HPB_FUNC)
+		return -ENODEV;
+
+	max_active_rgns = get_unaligned_be16(
+			desc_buf + UNIT_DESC_PARAM_HPB_LU_MAX_ACTIVE_RGNS);
+	if (!max_active_rgns) {
+		dev_err(hba->dev,
+			"lun %d wrong number of max active regions\n", lun);
+		return -ENODEV;
+	}
+
+	hpb_lu_info->num_blocks = get_unaligned_be64(
+			desc_buf + UNIT_DESC_PARAM_LOGICAL_BLK_COUNT);
+	hpb_lu_info->pinned_start = get_unaligned_be16(
+			desc_buf + UNIT_DESC_PARAM_HPB_PIN_RGN_START_OFF);
+	hpb_lu_info->num_pinned = get_unaligned_be16(
+			desc_buf + UNIT_DESC_PARAM_HPB_NUM_PIN_RGNS);
+	hpb_lu_info->max_active_rgns = max_active_rgns;
+
+	return 0;
+}
+
+void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	struct ufshpb_lu *hpb = sdev->hostdata;
+
+	if (!hpb)
+		return;
+
+	ufshpb_set_state(hpb, HPB_FAILED);
+
+	sdev = hpb->sdev_ufs_lu;
+	sdev->hostdata = NULL;
+
+	ufshpb_destroy_region_tbl(hpb);
+
+	list_del_init(&hpb->list_hpb_lu);
+
+	kfree(hpb);
+}
+
+static void ufshpb_hpb_lu_prepared(struct ufs_hba *hba)
+{
+	struct ufshpb_lu *hpb;
+	struct scsi_device *sdev;
+	bool init_success;
+
+	init_success = !ufshpb_check_hpb_reset_query(hba);
+
+	shost_for_each_device(sdev, hba->host) {
+		hpb = sdev->hostdata;
+		if (!hpb)
+			continue;
+
+		if (init_success) {
+			dev_info(hba->dev, "set state to present\n");
+			ufshpb_set_state(hpb, HPB_PRESENT);
+		} else {
+			dev_err(hba->dev, "destroy HPB lu %d\n", hpb->lun);
+			ufshpb_destroy_lu(hba, sdev);
+		}
+	}
+}
+
+void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev)
+{
+	struct ufshpb_lu *hpb;
+	int ret;
+	struct ufshpb_lu_info hpb_lu_info = { 0 };
+	int lun = sdev->lun;
+
+	if (lun >= hba->dev_info.max_lu_supported)
+		goto out;
+
+	ret = ufshpb_get_lu_info(hba, lun, &hpb_lu_info);
+	if (ret)
+		goto out;
+
+	hpb = ufshpb_alloc_hpb_lu(hba, lun, &hba->ufshpb_dev,
+				  &hpb_lu_info);
+	if (!hpb)
+		goto out;
+
+	hpb->sdev_ufs_lu = sdev;
+	sdev->hostdata = hpb;
+
+out:
+	/* All LUs are initialized */
+	if (atomic_dec_and_test(&hba->ufshpb_dev.slave_conf_cnt))
+		ufshpb_hpb_lu_prepared(hba);
+}
+
+void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf)
+{
+	struct ufshpb_dev_info *hpb_dev_info = &hba->ufshpb_dev;
+	int hpb_device_max_active_rgns = 0;
+	int hpb_num_lu;
+
+	hpb_num_lu = geo_buf[GEOMETRY_DESC_PARAM_HPB_NUMBER_LU];
+	if (hpb_num_lu == 0) {
+		dev_err(hba->dev, "No HPB LU supported\n");
+		hpb_dev_info->hpb_disabled = true;
+		return;
+	}
+
+	hpb_dev_info->rgn_size = geo_buf[GEOMETRY_DESC_PARAM_HPB_REGION_SIZE];
+	hpb_dev_info->srgn_size = geo_buf[GEOMETRY_DESC_PARAM_HPB_SUBREGION_SIZE];
+	hpb_device_max_active_rgns =
+		get_unaligned_be16(geo_buf +
+			GEOMETRY_DESC_PARAM_HPB_MAX_ACTIVE_REGS);
+
+	if (hpb_dev_info->rgn_size == 0 || hpb_dev_info->srgn_size == 0 ||
+	    hpb_device_max_active_rgns == 0) {
+		dev_err(hba->dev, "No HPB supported device\n");
+		hpb_dev_info->hpb_disabled = true;
+		return;
+	}
+}
+
+void ufshpb_get_dev_info(struct ufs_hba *hba, u8 *desc_buf)
+{
+	struct ufshpb_dev_info *hpb_dev_info = &hba->ufshpb_dev;
+	int version;
+	u8 hpb_mode;
+
+	hpb_mode = desc_buf[DEVICE_DESC_PARAM_HPB_CONTROL];
+	if (hpb_mode == HPB_HOST_CONTROL) {
+		dev_err(hba->dev, "%s: host control mode is not supported.\n",
+			__func__);
+		hpb_dev_info->hpb_disabled = true;
+		return;
+	}
+
+	version = get_unaligned_be16(desc_buf + DEVICE_DESC_PARAM_HPB_VER);
+	if (version != HPB_SUPPORT_VERSION) {
+		dev_err(hba->dev, "%s: HPB %x version is not supported.\n",
+			__func__, version);
+		hpb_dev_info->hpb_disabled = true;
+		return;
+	}
+
+	/*
+	 * Get the number of user logical unit to check whether all
+	 * scsi_device finish initialization
+	 */
+	hpb_dev_info->num_lu = desc_buf[DEVICE_DESC_PARAM_NUM_LU];
+}
+
+void ufshpb_init(struct ufs_hba *hba)
+{
+	struct ufshpb_dev_info *hpb_dev_info = &hba->ufshpb_dev;
+	int try;
+	int ret;
+
+	if (!ufshpb_is_allowed(hba))
+		return;
+
+	atomic_set(&hpb_dev_info->slave_conf_cnt, hpb_dev_info->num_lu);
+	/* issue HPB reset query */
+	for (try = 0; try < HPB_RESET_REQ_RETRIES; try++) {
+		ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+					QUERY_FLAG_IDN_HPB_RESET, 0, NULL);
+		if (!ret)
+			break;
+	}
+}
+
+void ufshpb_remove(struct ufs_hba *hba)
+{
+}
diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
new file mode 100644
index 000000000000..6fa5db94bcae
--- /dev/null
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -0,0 +1,167 @@ 
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Universal Flash Storage Host Performance Booster
+ *
+ * Copyright (C) 2017-2018 Samsung Electronics Co., Ltd.
+ *
+ * Authors:
+ *	Yongmyung Lee <ymhungry.lee@samsung.com>
+ *	Jinyoung Choi <j-young.choi@samsung.com>
+ */
+
+#ifndef _UFSHPB_H_
+#define _UFSHPB_H_
+
+/* hpb response UPIU macro */
+#define HPB_RSP_NONE				0x0
+#define	HPB_RSP_REQ_REGION_UPDATE		0x1
+#define HPB_RSP_DEV_RESET			0x2
+#define MAX_ACTIVE_NUM				2
+#define MAX_INACTIVE_NUM			2
+#define DEV_DATA_SEG_LEN			0x14
+#define DEV_SENSE_SEG_LEN			0x12
+#define DEV_DES_TYPE				0x80
+#define DEV_ADDITIONAL_LEN			0x10
+
+/* hpb map & entries macro */
+#define HPB_RGN_SIZE_UNIT			512
+#define HPB_ENTRY_BLOCK_SIZE			4096
+#define HPB_ENTRY_SIZE				0x8
+#define PINNED_NOT_SET				U32_MAX
+
+/* hpb support chunk size */
+#define HPB_MULTI_CHUNK_HIGH			1
+
+/* hpb vender defined opcode */
+#define UFSHPB_READ				0xF8
+#define UFSHPB_READ_BUFFER			0xF9
+#define UFSHPB_READ_BUFFER_ID			0x01
+#define HPB_READ_BUFFER_CMD_LENGTH		10
+#define LU_ENABLED_HPB_FUNC			0x02
+
+#define HPB_RESET_REQ_RETRIES			10
+
+#define HPB_SUPPORT_VERSION			0x100
+
+enum UFSHPB_MODE {
+	HPB_HOST_CONTROL,
+	HPB_DEVICE_CONTROL,
+};
+
+enum UFSHPB_STATE {
+	HPB_PRESENT = 1,
+	HPB_SUSPEND,
+	HPB_FAILED,
+	HPB_RESET,
+};
+
+enum HPB_RGN_STATE {
+	HPB_RGN_INACTIVE,
+	HPB_RGN_ACTIVE,
+	/* pinned regions are always active */
+	HPB_RGN_PINNED,
+};
+
+enum HPB_SRGN_STATE {
+	HPB_SRGN_UNUSED,
+	HPB_SRGN_INVALID,
+	HPB_SRGN_VALID,
+	HPB_SRGN_ISSUED,
+};
+
+/**
+ * struct ufshpb_lu_info - UFSHPB logical unit related info
+ * @num_blocks: the number of logical block
+ * @pinned_start: the start region number of pinned region
+ * @num_pinned: the number of pinned regions
+ * @max_active_rgns: maximum number of active regions
+ */
+struct ufshpb_lu_info {
+	int num_blocks;
+	int pinned_start;
+	int num_pinned;
+	int max_active_rgns;
+};
+
+struct ufshpb_subregion {
+	enum HPB_SRGN_STATE srgn_state;
+	int rgn_idx;
+	int srgn_idx;
+};
+
+struct ufshpb_region {
+	struct ufshpb_subregion *srgn_tbl;
+	enum HPB_RGN_STATE rgn_state;
+	int rgn_idx;
+	int srgn_cnt;
+};
+
+struct ufshpb_stats {
+	atomic_t hit_cnt;
+	atomic_t miss_cnt;
+	atomic_t rb_noti_cnt;
+	atomic_t rb_active_cnt;
+	atomic_t rb_inactive_cnt;
+	atomic_t map_req_cnt;
+};
+
+struct ufshpb_lu {
+	int lun;
+	struct scsi_device *sdev_ufs_lu;
+	struct ufshpb_region *rgn_tbl;
+
+	spinlock_t hpb_state_lock;
+	atomic_t hpb_state; /* hold hpb_state_lock */
+
+	/* pinned region information */
+	u32 lu_pinned_start;
+	u32 lu_pinned_end;
+
+	/* HPB related configuration */
+	u32 rgns_per_lu;
+	u32 srgns_per_lu;
+	int srgns_per_rgn;
+	u32 srgn_mem_size;
+	u32 entries_per_rgn_mask;
+	u32 entries_per_rgn_shift;
+	u32 entries_per_srgn;
+	u32 entries_per_srgn_mask;
+	u32 entries_per_srgn_shift;
+	u32 pages_per_srgn;
+
+	struct ufshpb_stats stats;
+
+	struct list_head list_hpb_lu;
+};
+
+struct ufs_hba;
+struct ufshcd_lrb;
+
+#ifndef CONFIG_SCSI_UFS_HPB
+static void ufshpb_resume(struct ufs_hba *hba) {}
+static void ufshpb_suspend(struct ufs_hba *hba) {}
+static void ufshpb_reset(struct ufs_hba *hba) {}
+static void ufshpb_reset_host(struct ufs_hba *hba) {}
+static void ufshpb_remove(struct ufs_hba *hba) {}
+static void ufshpb_init(struct ufs_hba *hba) {}
+static void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev) {}
+static void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev) {}
+static bool ufshpb_is_allowed(struct ufs_hba *hba) { return false; }
+static void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf) {}
+static void ufshpb_get_dev_info(struct ufs_hba *hba, u8 *desc_buf) {}
+#else
+void ufshpb_resume(struct ufs_hba *hba);
+void ufshpb_suspend(struct ufs_hba *hba);
+void ufshpb_reset(struct ufs_hba *hba);
+void ufshpb_reset_host(struct ufs_hba *hba);
+void ufshpb_init(struct ufs_hba *hba);
+void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev);
+void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev);
+void ufshpb_remove(struct ufs_hba *hba);
+bool ufshpb_is_allowed(struct ufs_hba *hba);
+void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf);
+void ufshpb_get_dev_info(struct ufs_hba *hba, u8 *desc_buf);
+extern struct attribute_group ufs_sysfs_hpb_stat_group;
+#endif
+
+#endif /* End of Header */