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Date:   Sat, 06 Feb 2021 15:23:38 +0800
From:   Can Guo <cang@codeaurora.org>
To:     daejun7.park@samsung.com
Cc:     Greg KH <gregkh@linuxfoundation.org>, avri.altman@wdc.com,
        jejb@linux.ibm.com, martin.petersen@oracle.com,
        asutoshd@codeaurora.org, stanley.chu@mediatek.com,
        huobean@gmail.com, bvanassche@acm.org,
        ALIM AKHTAR <alim.akhtar@samsung.com>,
        linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
        Sung-Jun Park <sungjun07.park@samsung.com>,
        yongmyung lee <ymhungry.lee@samsung.com>,
        Jinyoung CHOI <j-young.choi@samsung.com>,
        BoRam Shin <boram.shin@samsung.com>,
        SEUNGUK SHIN <seunguk.shin@samsung.com>
Subject: Re: [PATCH v19 2/3] scsi: ufs: L2P map management for HPB read
In-Reply-To: <20210129053005epcms2p323338fbb83459d2786fc0ef92701b147@epcms2p3>
References: <20210129052848epcms2p6e5797efd94e6282b76ad9ae6c99e3ab5@epcms2p6>
 <CGME20210129052848epcms2p6e5797efd94e6282b76ad9ae6c99e3ab5@epcms2p3>
 <20210129053005epcms2p323338fbb83459d2786fc0ef92701b147@epcms2p3>
Message-ID: <652fa8013c26df497049abe923eb1b97@codeaurora.org>
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Precedence: bulk

On 2021-01-29 13:30, Daejun Park wrote:
> This is a patch for managing L2P map in HPB module.
> 
> The HPB divides logical addresses into several regions. A region 
> consists
> of several sub-regions. The sub-region is a basic unit where L2P 
> mapping is
> managed. The driver loads L2P mapping data of each sub-region. The 
> loaded
> sub-region is called active-state. The HPB driver unloads L2P mapping 
> data
> as region unit. The unloaded region is called inactive-state.
> 
> Sub-region/region candidates to be loaded and unloaded are delivered 
> from
> the UFS device. The UFS device delivers the recommended active 
> sub-region
> and inactivate region to the driver using sensedata.
> The HPB module performs L2P mapping management on the host through the
> delivered information.
> 
> A pinned region is a pre-set regions on the UFS device that is always
> activate-state.
> 
> The data structure for map data request and L2P map uses mempool API,
> minimizing allocation overhead while avoiding static allocation.
> 
> The mininum size of the memory pool used in the HPB is implemented
> as a module parameter, so that it can be configurable by the user.
> 
> To gurantee a minimum memory pool size of 4MB: 
> ufshpb_host_map_kbytes=4096
> 
> The map_work manages active/inactive by 2 "to-do" lists.
> Each hpb lun maintains 2 "to-do" lists:
>   hpb->lh_inact_rgn - regions to be inactivated, and
>   hpb->lh_act_srgn - subregions to be activated
> Those lists are maintained on IO completion.
> 
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>
> Reviewed-by: Can Guo <cang@codeaurora.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/ufs.h    |  36 ++
>  drivers/scsi/ufs/ufshcd.c |   4 +
>  drivers/scsi/ufs/ufshpb.c | 993 +++++++++++++++++++++++++++++++++++++-
>  drivers/scsi/ufs/ufshpb.h |  65 +++
>  4 files changed, 1083 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index 65563635e20e..075c12e7de7e 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -472,6 +472,41 @@ struct utp_cmd_rsp {
>  	u8 sense_data[UFS_SENSE_SIZE];
>  };
> 
> +struct ufshpb_active_field {
> +	__be16 active_rgn;
> +	__be16 active_srgn;
> +};
> +#define HPB_ACT_FIELD_SIZE 4
> +
> +/**
> + * struct utp_hpb_rsp - Response UPIU structure
> + * @residual_transfer_count: Residual transfer count DW-3
> + * @reserved1: Reserved double words DW-4 to DW-7
> + * @sense_data_len: Sense data length DW-8 U16
> + * @desc_type: Descriptor type of sense data
> + * @additional_len: Additional length of sense data
> + * @hpb_op: HPB operation type
> + * @reserved2: Reserved field
> + * @active_rgn_cnt: Active region count
> + * @inactive_rgn_cnt: Inactive region count
> + * @hpb_active_field: Recommended to read HPB region and subregion
> + * @hpb_inactive_field: To be inactivated HPB region and subregion
> + */
> +struct utp_hpb_rsp {
> +	__be32 residual_transfer_count;
> +	__be32 reserved1[4];
> +	__be16 sense_data_len;
> +	u8 desc_type;
> +	u8 additional_len;
> +	u8 hpb_op;
> +	u8 reserved2;
> +	u8 active_rgn_cnt;
> +	u8 inactive_rgn_cnt;
> +	struct ufshpb_active_field hpb_active_field[2];
> +	__be16 hpb_inactive_field[2];
> +};
> +#define UTP_HPB_RSP_SIZE 40
> +
>  /**
>   * struct utp_upiu_rsp - general upiu response structure
>   * @header: UPIU header structure DW-0 to DW-2
> @@ -482,6 +517,7 @@ struct utp_upiu_rsp {
>  	struct utp_upiu_header header;
>  	union {
>  		struct utp_cmd_rsp sr;
> +		struct utp_hpb_rsp hr;
>  		struct utp_upiu_query qr;
>  	};
>  };
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index b8d6a52f5603..52e48de8d27c 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -5018,6 +5018,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba,
> struct ufshcd_lrb *lrbp)
>  				 */
>  				pm_runtime_get_noresume(hba->dev);
>  			}
> +
> +			if (scsi_status == SAM_STAT_GOOD)
> +				ufshpb_rsp_upiu(hba, lrbp);
>  			break;
>  		case UPIU_TRANSACTION_REJECT_UPIU:
>  			/* TODO: handle Reject UPIU Response */
> @@ -9228,6 +9231,7 @@ 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/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> index 1f84141ed384..48edfdd0f606 100644
> --- a/drivers/scsi/ufs/ufshpb.c
> +++ b/drivers/scsi/ufs/ufshpb.c
> @@ -16,11 +16,73 @@
>  #include "ufshpb.h"
>  #include "../sd.h"
> 
> +/* memory management */
> +static struct kmem_cache *ufshpb_mctx_cache;
> +static mempool_t *ufshpb_mctx_pool;
> +static mempool_t *ufshpb_page_pool;
> +/* A cache size of 2MB can cache ppn in the 1GB range. */
> +static unsigned int ufshpb_host_map_kbytes = 2048;
> +static int tot_active_srgn_pages;
> +
> +static struct workqueue_struct *ufshpb_wq;
> +
>  bool ufshpb_is_allowed(struct ufs_hba *hba)
>  {
>  	return !(hba->ufshpb_dev.hpb_disabled);
>  }
> 
> +static bool ufshpb_is_general_lun(int lun)
> +{
> +	return lun < UFS_UPIU_MAX_UNIT_NUM_ID;
> +}
> +
> +static bool
> +ufshpb_is_pinned_region(struct ufshpb_lu *hpb, int rgn_idx)
> +{
> +	if (hpb->lu_pinned_end != PINNED_NOT_SET &&
> +	    rgn_idx >= hpb->lu_pinned_start &&
> +	    rgn_idx <= hpb->lu_pinned_end)
> +		return true;
> +
> +	return false;
> +}
> +
> +static void ufshpb_kick_map_work(struct ufshpb_lu *hpb)
> +{
> +	bool ret = true;

-> ret = false;

> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	if (!list_empty(&hpb->lh_inact_rgn) || 
> !list_empty(&hpb->lh_act_srgn))
> +		ret = false;

-> ret = true;

> +	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +
> +	if (ret)
> +		queue_work(ufshpb_wq, &hpb->map_work);
> +}
> +
> +static bool ufshpb_is_hpb_rsp_valid(struct ufs_hba *hba,
> +					 struct ufshcd_lrb *lrbp,
> +					 struct utp_hpb_rsp *rsp_field)
> +{
> +	if (be16_to_cpu(rsp_field->sense_data_len) != DEV_SENSE_SEG_LEN ||
> +	    rsp_field->desc_type != DEV_DES_TYPE ||
> +	    rsp_field->additional_len != DEV_ADDITIONAL_LEN ||
> +	    rsp_field->hpb_op == HPB_RSP_NONE ||

HPB_RSP_NONE is checked again in switch-case, no need of this line.

> +	    rsp_field->active_rgn_cnt > MAX_ACTIVE_NUM ||
> +	    rsp_field->inactive_rgn_cnt > MAX_INACTIVE_NUM ||
> +	    (!rsp_field->active_rgn_cnt && !rsp_field->inactive_rgn_cnt))
> +		return false;
> +
> +	if (!ufshpb_is_general_lun(lrbp->lun)) {
> +		dev_warn(hba->dev, "ufshpb: lun(%d) not supported\n",
> +			 lrbp->lun);
> +		return false;
> +	}
> +
> +	return true;
> +}
> +
>  static struct ufshpb_lu *ufshpb_get_hpb_data(struct scsi_device *sdev)
>  {
>  	return sdev->hostdata;
> @@ -36,13 +98,741 @@ static void ufshpb_set_state(struct ufshpb_lu
> *hpb, int state)
>  	atomic_set(&hpb->hpb_state, state);
>  }
> 
> +static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
> +					     struct ufshpb_subregion *srgn)
> +{
> +	struct ufshpb_req *map_req;
> +	struct request *req;
> +	struct bio *bio;
> +
> +	map_req = kmem_cache_alloc(hpb->map_req_cache, GFP_KERNEL);
> +	if (!map_req)
> +		return NULL;
> +
> +	req = blk_get_request(hpb->sdev_ufs_lu->request_queue,
> +			      REQ_OP_SCSI_IN, 0);
> +	if (IS_ERR(req))
> +		goto free_map_req;
> +
> +	bio = bio_alloc(GFP_KERNEL, hpb->pages_per_srgn);
> +	if (!bio) {
> +		blk_put_request(req);
> +		goto free_map_req;
> +	}
> +
> +	map_req->hpb = hpb;
> +	map_req->req = req;
> +	map_req->bio = bio;
> +
> +	map_req->rgn_idx = srgn->rgn_idx;
> +	map_req->srgn_idx = srgn->srgn_idx;
> +	map_req->mctx = srgn->mctx;
> +
> +	return map_req;
> +
> +free_map_req:
> +	kmem_cache_free(hpb->map_req_cache, map_req);
> +	return NULL;
> +}
> +
> +static void ufshpb_put_map_req(struct ufshpb_lu *hpb,
> +				      struct ufshpb_req *map_req)
> +{
> +	bio_put(map_req->bio);
> +	blk_put_request(map_req->req);
> +	kmem_cache_free(hpb->map_req_cache, map_req);
> +}
> +
> +static int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb,
> +				     struct ufshpb_subregion *srgn)
> +{
> +	WARN_ON(!srgn->mctx);
> +	bitmap_zero(srgn->mctx->ppn_dirty, hpb->entries_per_srgn);
> +	return 0;
> +}
> +
> +static void ufshpb_update_active_info(struct ufshpb_lu *hpb, int 
> rgn_idx,
> +				      int srgn_idx)
> +{
> +	struct ufshpb_region *rgn;
> +	struct ufshpb_subregion *srgn;
> +
> +	rgn = hpb->rgn_tbl + rgn_idx;
> +	srgn = rgn->srgn_tbl + srgn_idx;
> +
> +	list_del_init(&rgn->list_inact_rgn);
> +
> +	if (list_empty(&srgn->list_act_srgn))
> +		list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
> +}
> +
> +static void ufshpb_update_inactive_info(struct ufshpb_lu *hpb, int 
> rgn_idx)
> +{
> +	struct ufshpb_region *rgn;
> +	struct ufshpb_subregion *srgn;
> +	int srgn_idx;
> +
> +	rgn = hpb->rgn_tbl + rgn_idx;
> +
> +	for_each_sub_region(rgn, srgn_idx, srgn)
> +		list_del_init(&srgn->list_act_srgn);
> +
> +	if (list_empty(&rgn->list_inact_rgn))
> +		list_add_tail(&rgn->list_inact_rgn, &hpb->lh_inact_rgn);
> +}
> +
> +static void ufshpb_activate_subregion(struct ufshpb_lu *hpb,
> +					  struct ufshpb_subregion *srgn)
> +{
> +	struct ufshpb_region *rgn;
> +
> +	/*
> +	 * If there is no mctx in subregion
> +	 * after I/O progress for HPB_READ_BUFFER, the region to which the
> +	 * subregion belongs was evicted.
> +	 * Mask sure the region must not evict in I/O progress
> +	 */
> +	WARN_ON(!srgn->mctx);
> +
> +	rgn = hpb->rgn_tbl + srgn->rgn_idx;
> +
> +	if (unlikely(rgn->rgn_state == HPB_RGN_INACTIVE)) {
> +		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> +			"region %d subregion %d evicted\n",
> +			srgn->rgn_idx, srgn->srgn_idx);
> +		srgn->srgn_state = HPB_SRGN_INVALID;
> +		return;
> +	}
> +	srgn->srgn_state = HPB_SRGN_VALID;
> +}
> +
> +static void ufshpb_map_req_compl_fn(struct request *req, blk_status_t 
> error)
> +{
> +	struct ufshpb_req *map_req = (struct ufshpb_req *) req->end_io_data;
> +	struct ufshpb_lu *hpb = map_req->hpb;
> +	struct ufshpb_subregion *srgn;
> +	unsigned long flags;
> +
> +	srgn = hpb->rgn_tbl[map_req->rgn_idx].srgn_tbl +
> +		map_req->srgn_idx;
> +
> +	ufshpb_clear_dirty_bitmap(hpb, srgn);
> +	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> +	ufshpb_activate_subregion(hpb, srgn);
> +	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> +
> +	ufshpb_put_map_req(map_req->hpb, map_req);
> +}
> +
> +static void ufshpb_set_read_buf_cmd(unsigned char *cdb, int rgn_idx,
> +					   int srgn_idx, int srgn_mem_size)
> +{
> +	cdb[0] = UFSHPB_READ_BUFFER;
> +	cdb[1] = UFSHPB_READ_BUFFER_ID;
> +
> +	put_unaligned_be16(rgn_idx, &cdb[2]);
> +	put_unaligned_be16(srgn_idx, &cdb[4]);
> +	put_unaligned_be24(srgn_mem_size, &cdb[6]);
> +
> +	cdb[9] = 0x00;
> +}
> +
> +static int ufshpb_execute_map_req(struct ufshpb_lu *hpb,
> +				  struct ufshpb_req *map_req)
> +{
> +	struct request_queue *q;
> +	struct request *req;
> +	struct scsi_request *rq;
> +	int ret = 0;
> +	int i;
> +
> +	q = hpb->sdev_ufs_lu->request_queue;
> +	for (i = 0; i < hpb->pages_per_srgn; i++) {
> +		ret = bio_add_pc_page(q, map_req->bio, map_req->mctx->m_page[i],
> +				      PAGE_SIZE, 0);
> +		if (ret != PAGE_SIZE) {
> +			dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> +				   "bio_add_pc_page fail %d - %d\n",
> +				   map_req->rgn_idx, map_req->srgn_idx);
> +			return ret;
> +		}
> +	}
> +
> +	req = map_req->req;
> +
> +	blk_rq_append_bio(req, &map_req->bio);
> +
> +	req->end_io_data = map_req;
> +
> +	rq = scsi_req(req);
> +	ufshpb_set_read_buf_cmd(rq->cmd, map_req->rgn_idx,
> +				map_req->srgn_idx, hpb->srgn_mem_size);
> +	rq->cmd_len = HPB_READ_BUFFER_CMD_LENGTH;
> +
> +	blk_execute_rq_nowait(q, NULL, req, 1, ufshpb_map_req_compl_fn);
> +
> +	hpb->stats.map_req_cnt++;
> +	return 0;
> +}
> +
> +static struct ufshpb_map_ctx *ufshpb_get_map_ctx(struct ufshpb_lu 
> *hpb)
> +{
> +	struct ufshpb_map_ctx *mctx;
> +	int i, j;
> +
> +	mctx = mempool_alloc(ufshpb_mctx_pool, GFP_KERNEL);
> +	if (!mctx)
> +		return NULL;
> +
> +	mctx->m_page = kmem_cache_alloc(hpb->m_page_cache, GFP_KERNEL);
> +	if (!mctx->m_page)
> +		goto release_mctx;
> +
> +	mctx->ppn_dirty = bitmap_zalloc(hpb->entries_per_srgn, GFP_KERNEL);
> +	if (!mctx->ppn_dirty)
> +		goto release_m_page;
> +
> +	for (i = 0; i < hpb->pages_per_srgn; i++) {
> +		mctx->m_page[i] = mempool_alloc(ufshpb_page_pool, GFP_KERNEL);
> +		if (!mctx->m_page[i]) {
> +			for (j = 0; j < i; j++)
> +				mempool_free(mctx->m_page[j], ufshpb_page_pool);
> +			goto release_ppn_dirty;
> +		}
> +		clear_page(page_address(mctx->m_page[i]));
> +	}
> +
> +	return mctx;
> +
> +release_ppn_dirty:
> +	bitmap_free(mctx->ppn_dirty);
> +release_m_page:
> +	kmem_cache_free(hpb->m_page_cache, mctx->m_page);
> +release_mctx:
> +	mempool_free(mctx, ufshpb_mctx_pool);
> +	return NULL;
> +}
> +
> +static void ufshpb_put_map_ctx(struct ufshpb_lu *hpb,
> +				      struct ufshpb_map_ctx *mctx)
> +{
> +	int i;
> +
> +	for (i = 0; i < hpb->pages_per_srgn; i++)
> +		mempool_free(mctx->m_page[i], ufshpb_page_pool);
> +
> +	bitmap_free(mctx->ppn_dirty);
> +	kmem_cache_free(hpb->m_page_cache, mctx->m_page);
> +	mempool_free(mctx, ufshpb_mctx_pool);
> +}
> +
> +static int ufshpb_check_srgns_issue_state(struct ufshpb_lu *hpb,
> +					  struct ufshpb_region *rgn)
> +{
> +	struct ufshpb_subregion *srgn;
> +	int srgn_idx;
> +
> +	for_each_sub_region(rgn, srgn_idx, srgn)
> +		if (srgn->srgn_state == HPB_SRGN_ISSUED)
> +			return -EPERM;
> +
> +	return 0;
> +}
> +
> +static void ufshpb_add_lru_info(struct victim_select_info *lru_info,
> +				       struct ufshpb_region *rgn)
> +{
> +	rgn->rgn_state = HPB_RGN_ACTIVE;
> +	list_add_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
> +	atomic_inc(&lru_info->active_cnt);
> +}
> +
> +static void ufshpb_hit_lru_info(struct victim_select_info *lru_info,
> +				       struct ufshpb_region *rgn)
> +{
> +	list_move_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
> +}
> +
> +static struct ufshpb_region *ufshpb_victim_lru_info(struct ufshpb_lu 
> *hpb)
> +{
> +	struct victim_select_info *lru_info = &hpb->lru_info;
> +	struct ufshpb_region *rgn, *victim_rgn = NULL;
> +
> +	list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn) {
> +		WARN_ON(!rgn);
> +		if (ufshpb_check_srgns_issue_state(hpb, rgn))
> +			continue;
> +
> +		victim_rgn = rgn;
> +		break;
> +	}
> +
> +	return victim_rgn;
> +}
> +
> +static void ufshpb_cleanup_lru_info(struct victim_select_info 
> *lru_info,
> +					   struct ufshpb_region *rgn)
> +{
> +	list_del_init(&rgn->list_lru_rgn);
> +	rgn->rgn_state = HPB_RGN_INACTIVE;
> +	atomic_dec(&lru_info->active_cnt);
> +}
> +
> +static void ufshpb_purge_active_subregion(struct ufshpb_lu *hpb,
> +						 struct ufshpb_subregion *srgn)
> +{
> +	if (srgn->srgn_state != HPB_SRGN_UNUSED) {
> +		ufshpb_put_map_ctx(hpb, srgn->mctx);
> +		srgn->srgn_state = HPB_SRGN_UNUSED;
> +		srgn->mctx = NULL;
> +	}
> +}
> +
> +static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
> +				  struct ufshpb_region *rgn)
> +{
> +	struct victim_select_info *lru_info;
> +	struct ufshpb_subregion *srgn;
> +	int srgn_idx;
> +
> +	lru_info = &hpb->lru_info;
> +
> +	dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "evict region %d\n", 
> rgn->rgn_idx);
> +
> +	ufshpb_cleanup_lru_info(lru_info, rgn);
> +
> +	for_each_sub_region(rgn, srgn_idx, srgn)
> +		ufshpb_purge_active_subregion(hpb, srgn);
> +}
> +
> +static int ufshpb_evict_region(struct ufshpb_lu *hpb, struct
> ufshpb_region *rgn)
> +{
> +	unsigned long flags;
> +	int ret = 0;
> +
> +	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> +	if (rgn->rgn_state == HPB_RGN_PINNED) {
> +		dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
> +			 "pinned region cannot drop-out. region %d\n",
> +			 rgn->rgn_idx);
> +		goto out;
> +	}
> +	if (!list_empty(&rgn->list_lru_rgn)) {
> +		if (ufshpb_check_srgns_issue_state(hpb, rgn)) {
> +			ret = -EBUSY;
> +			goto out;
> +		}
> +
> +		__ufshpb_evict_region(hpb, rgn);
> +	}
> +out:
> +	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> +	return ret;
> +}
> +
> +static int ufshpb_issue_map_req(struct ufshpb_lu *hpb,
> +				struct ufshpb_region *rgn,
> +				struct ufshpb_subregion *srgn)
> +{
> +	struct ufshpb_req *map_req;
> +	unsigned long flags;
> +	int ret;
> +	int err = -EAGAIN;
> +	bool alloc_required = false;
> +	enum HPB_SRGN_STATE state = HPB_SRGN_INVALID;
> +
> +	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> +
> +	if (ufshpb_get_state(hpb) != HPB_PRESENT) {
> +		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
> +			   "%s: ufshpb state is not PRESENT\n", __func__);
> +		goto unlock_out;
> +	}
> +
> +	if ((rgn->rgn_state == HPB_RGN_INACTIVE) &&
> +	    (srgn->srgn_state == HPB_SRGN_INVALID)) {
> +		err = 0;
> +		goto unlock_out;
> +	}
> +
> +	if (srgn->srgn_state == HPB_SRGN_UNUSED)
> +		alloc_required = true;
> +
> +	/*
> +	 * If the subregion is already ISSUED state,
> +	 * a specific event (e.g., GC or wear-leveling, etc.) occurs in
> +	 * the device and HPB response for map loading is received.
> +	 * In this case, after finishing the HPB_READ_BUFFER,
> +	 * the next HPB_READ_BUFFER is performed again to obtain the latest
> +	 * map data.
> +	 */
> +	if (srgn->srgn_state == HPB_SRGN_ISSUED)
> +		goto unlock_out;
> +
> +	srgn->srgn_state = HPB_SRGN_ISSUED;
> +	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> +
> +	if (alloc_required) {
> +		WARN_ON(srgn->mctx);
> +		srgn->mctx = ufshpb_get_map_ctx(hpb);
> +		if (!srgn->mctx) {
> +			dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> +			    "get map_ctx failed. region %d - %d\n",
> +			    rgn->rgn_idx, srgn->srgn_idx);
> +			state = HPB_SRGN_UNUSED;
> +			goto change_srgn_state;
> +		}
> +	}
> +
> +	map_req = ufshpb_get_map_req(hpb, srgn);
> +	if (!map_req)
> +		goto change_srgn_state;
> +
> +
> +	ret = ufshpb_execute_map_req(hpb, map_req);
> +	if (ret) {
> +		dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> +			   "%s: issue map_req failed: %d, region %d - %d\n",
> +			   __func__, ret, srgn->rgn_idx, srgn->srgn_idx);
> +		goto free_map_req;
> +	}
> +	return 0;
> +
> +free_map_req:
> +	ufshpb_put_map_req(hpb, map_req);
> +change_srgn_state:
> +	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> +	srgn->srgn_state = state;
> +unlock_out:
> +	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> +	return err;
> +}
> +
> +static int ufshpb_add_region(struct ufshpb_lu *hpb, struct 
> ufshpb_region *rgn)
> +{
> +	struct ufshpb_region *victim_rgn;
> +	struct victim_select_info *lru_info = &hpb->lru_info;
> +	unsigned long flags;
> +	int ret = 0;
> +
> +	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> +	/*
> +	 * If region belongs to lru_list, just move the region
> +	 * to the front of lru list. because the state of the region
> +	 * is already active-state
> +	 */
> +	if (!list_empty(&rgn->list_lru_rgn)) {
> +		ufshpb_hit_lru_info(lru_info, rgn);
> +		goto out;
> +	}
> +
> +	if (rgn->rgn_state == HPB_RGN_INACTIVE) {
> +		if (atomic_read(&lru_info->active_cnt) ==
> +		    lru_info->max_lru_active_cnt) {
> +			/*
> +			 * If the maximum number of active regions
> +			 * is exceeded, evict the least recently used region.
> +			 * This case may occur when the device responds
> +			 * to the eviction information late.
> +			 * It is okay to evict the least recently used region,
> +			 * because the device could detect this region
> +			 * by not issuing HPB_READ
> +			 */
> +			victim_rgn = ufshpb_victim_lru_info(hpb);
> +			if (!victim_rgn) {
> +				dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
> +				    "cannot get victim region error\n");
> +				ret = -ENOMEM;
> +				goto out;
> +			}
> +
> +			dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
> +				"LRU full (%d), choose victim %d\n",
> +				atomic_read(&lru_info->active_cnt),
> +				victim_rgn->rgn_idx);
> +			__ufshpb_evict_region(hpb, victim_rgn);
> +		}
> +
> +		/*
> +		 * When a region is added to lru_info list_head,
> +		 * it is guaranteed that the subregion has been
> +		 * assigned all mctx. If failed, try to receive mctx again
> +		 * without being added to lru_info list_head
> +		 */
> +		ufshpb_add_lru_info(lru_info, rgn);
> +	}
> +out:
> +	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> +	return ret;
> +}
> +
> +static void ufshpb_rsp_req_region_update(struct ufshpb_lu *hpb,
> +					 struct utp_hpb_rsp *rsp_field)
> +{
> +	int i, rgn_idx, srgn_idx;
> +
> +	BUILD_BUG_ON(sizeof(struct ufshpb_active_field) != 
> HPB_ACT_FIELD_SIZE);
> +	/*
> +	 * If the active region and the inactive region are the same,
> +	 * we will inactivate this region.
> +	 * The device could check this (region inactivated) and
> +	 * will response the proper active region information
> +	 */
> +	spin_lock(&hpb->rsp_list_lock);
> +	for (i = 0; i < rsp_field->active_rgn_cnt; i++) {
> +		rgn_idx =
> +			be16_to_cpu(rsp_field->hpb_active_field[i].active_rgn);
> +		srgn_idx =
> +			be16_to_cpu(rsp_field->hpb_active_field[i].active_srgn);
> +
> +		dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
> +			"activate(%d) region %d - %d\n", i, rgn_idx, srgn_idx);
> +		ufshpb_update_active_info(hpb, rgn_idx, srgn_idx);
> +		hpb->stats.rb_active_cnt++;
> +	}
> +
> +	for (i = 0; i < rsp_field->inactive_rgn_cnt; i++) {
> +		rgn_idx = be16_to_cpu(rsp_field->hpb_inactive_field[i]);
> +		dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
> +			"inactivate(%d) region %d\n", i, rgn_idx);
> +		ufshpb_update_inactive_info(hpb, rgn_idx);
> +		hpb->stats.rb_inactive_cnt++;
> +	}
> +	spin_unlock(&hpb->rsp_list_lock);
> +
> +	dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "Noti: #ACT %u #INACT %u\n",
> +		rsp_field->active_rgn_cnt, rsp_field->inactive_rgn_cnt);
> +
> +	queue_work(ufshpb_wq, &hpb->map_work);
> +}
> +
> +/*
> + * This function will parse recommended active subregion information 
> in sense
> + * data field of response UPIU with SAM_STAT_GOOD state.
> + */
> +void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
> +{
> +	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(lrbp->cmd->device);
> +	struct utp_hpb_rsp *rsp_field;
> +	int data_seg_len;
> +
> +	if (!hpb)
> +		return;

You are assuming HPB recommandations only come in responses to LUs
with HPB enabled, but the specs says the recommandations can come
in any responses with GOOD status, meaning you should check the *hpb
which belongs to the LUN in res_field, but not the one belongs to
lrbp->cmd->device.

Regards,

Can Guo

> +
> +	if (ufshpb_get_state(hpb) != HPB_PRESENT) {
> +		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
> +			   "%s: ufshpb state is not PRESENT\n", __func__);
> +		return;
> +	}
> +
> +	data_seg_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2)
> +		& MASK_RSP_UPIU_DATA_SEG_LEN;
> +
> +	/* To flush remained rsp_list, we queue the map_work task */
> +	if (!data_seg_len) {
> +		if (!ufshpb_is_general_lun(lrbp->lun))
> +			return;
> +
> +		ufshpb_kick_map_work(hpb);
> +		return;
> +	}
> +
> +	/* Check HPB_UPDATE_ALERT */
> +	if (!(lrbp->ucd_rsp_ptr->header.dword_2 &
> +	      UPIU_HEADER_DWORD(0, 2, 0, 0)))
> +		return;
> +
> +	rsp_field = &lrbp->ucd_rsp_ptr->hr;
> +	BUILD_BUG_ON(sizeof(struct utp_hpb_rsp) != UTP_HPB_RSP_SIZE);
> +
> +	if (!ufshpb_is_hpb_rsp_valid(hba, lrbp, rsp_field))
> +		return;
> +
> +	hpb->stats.rb_noti_cnt++;
> +
> +	switch (rsp_field->hpb_op) {
> +	case HPB_RSP_NONE:
> +		/* nothing to do */
> +		break;
> +	case HPB_RSP_REQ_REGION_UPDATE:
> +		WARN_ON(data_seg_len != DEV_DATA_SEG_LEN);
> +		ufshpb_rsp_req_region_update(hpb, rsp_field);
> +		break;
> +	case HPB_RSP_DEV_RESET:
> +		dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
> +			 "UFS device lost HPB information during PM.\n");
> +		break;
> +	default:
> +		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
> +			   "hpb_op is not available: %d\n",
> +			   rsp_field->hpb_op);
> +		break;
> +	}
> +}
> +
> +static void ufshpb_add_active_list(struct ufshpb_lu *hpb,
> +				   struct ufshpb_region *rgn,
> +				   struct ufshpb_subregion *srgn)
> +{
> +	if (!list_empty(&rgn->list_inact_rgn))
> +		return;
> +
> +	if (!list_empty(&srgn->list_act_srgn)) {
> +		list_move(&srgn->list_act_srgn, &hpb->lh_act_srgn);
> +		return;
> +	}
> +
> +	list_add(&srgn->list_act_srgn, &hpb->lh_act_srgn);
> +}
> +
> +static void ufshpb_add_pending_evict_list(struct ufshpb_lu *hpb,
> +				    struct ufshpb_region *rgn,
> +				    struct list_head *pending_list)
> +{
> +	struct ufshpb_subregion *srgn;
> +	int srgn_idx;
> +
> +	if (!list_empty(&rgn->list_inact_rgn))
> +		return;
> +
> +	for_each_sub_region(rgn, srgn_idx, srgn)
> +		if (!list_empty(&srgn->list_act_srgn))
> +			return;
> +
> +	list_add_tail(&rgn->list_inact_rgn, pending_list);
> +}
> +
> +static void ufshpb_run_active_subregion_list(struct ufshpb_lu *hpb)
> +{
> +	struct ufshpb_region *rgn;
> +	struct ufshpb_subregion *srgn;
> +	unsigned long flags;
> +	int ret = 0;
> +
> +	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	while ((srgn = list_first_entry_or_null(&hpb->lh_act_srgn,
> +						struct ufshpb_subregion,
> +						list_act_srgn))) {
> +		if (ufshpb_get_state(hpb) == HPB_SUSPEND)
> +			break;
> +
> +		list_del_init(&srgn->list_act_srgn);
> +		spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +
> +		rgn = hpb->rgn_tbl + srgn->rgn_idx;
> +		ret = ufshpb_add_region(hpb, rgn);
> +		if (ret)
> +			goto active_failed;
> +
> +		ret = ufshpb_issue_map_req(hpb, rgn, srgn);
> +		if (ret) {
> +			dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> +			    "issue map_req failed. ret %d, region %d - %d\n",
> +			    ret, rgn->rgn_idx, srgn->srgn_idx);
> +			goto active_failed;
> +		}
> +		spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	}
> +	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +	return;
> +
> +active_failed:
> +	dev_err(&hpb->sdev_ufs_lu->sdev_dev, "failed to activate region %d -
> %d, will retry\n",
> +		   rgn->rgn_idx, srgn->srgn_idx);
> +	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	ufshpb_add_active_list(hpb, rgn, srgn);
> +	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +}
> +
> +static void ufshpb_run_inactive_region_list(struct ufshpb_lu *hpb)
> +{
> +	struct ufshpb_region *rgn;
> +	unsigned long flags;
> +	int ret;
> +	LIST_HEAD(pending_list);
> +
> +	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	while ((rgn = list_first_entry_or_null(&hpb->lh_inact_rgn,
> +					       struct ufshpb_region,
> +					       list_inact_rgn))) {
> +		if (ufshpb_get_state(hpb) == HPB_SUSPEND)
> +			break;
> +
> +		list_del_init(&rgn->list_inact_rgn);
> +		spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +
> +		ret = ufshpb_evict_region(hpb, rgn);
> +		if (ret) {
> +			spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +			ufshpb_add_pending_evict_list(hpb, rgn, &pending_list);
> +			spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +		}
> +
> +		spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	}
> +
> +	list_splice(&pending_list, &hpb->lh_inact_rgn);
> +	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +}
> +
> +static void ufshpb_map_work_handler(struct work_struct *work)
> +{
> +	struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu, 
> map_work);
> +
> +	if (ufshpb_get_state(hpb) != HPB_PRESENT) {
> +		dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
> +			   "%s: ufshpb state is not PRESENT\n", __func__);
> +		return;
> +	}
> +
> +	ufshpb_run_inactive_region_list(hpb);
> +	ufshpb_run_active_subregion_list(hpb);
> +}
> +
> +/*
> + * this function doesn't need to hold lock due to be called in init.
> + * (rgn_state_lock, rsp_list_lock, etc..)
> + */
> +static int ufshpb_init_pinned_active_region(struct ufs_hba *hba,
> +					    struct ufshpb_lu *hpb,
> +					    struct ufshpb_region *rgn)
> +{
> +	struct ufshpb_subregion *srgn;
> +	int srgn_idx, i;
> +	int err = 0;
> +
> +	for_each_sub_region(rgn, srgn_idx, srgn) {
> +		srgn->mctx = ufshpb_get_map_ctx(hpb);
> +		srgn->srgn_state = HPB_SRGN_INVALID;
> +		if (!srgn->mctx) {
> +			err = -ENOMEM;
> +			dev_err(hba->dev,
> +				"alloc mctx for pinned region failed\n");
> +			goto release;
> +		}
> +
> +		list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
> +	}
> +
> +	rgn->rgn_state = HPB_RGN_PINNED;
> +	return 0;
> +
> +release:
> +	for (i = 0; i < srgn_idx; i++) {
> +		srgn = rgn->srgn_tbl + i;
> +		ufshpb_put_map_ctx(hpb, srgn->mctx);
> +	}
> +	return err;
> +}
> +
>  static void ufshpb_init_subregion_tbl(struct ufshpb_lu *hpb,
>  				      struct ufshpb_region *rgn)
>  {
>  	int srgn_idx;
> +	struct ufshpb_subregion *srgn;
> 
> -	for (srgn_idx = 0; srgn_idx < rgn->srgn_cnt; srgn_idx++) {
> -		struct ufshpb_subregion *srgn = rgn->srgn_tbl + srgn_idx;
> +	for_each_sub_region(rgn, srgn_idx, srgn) {
> +		INIT_LIST_HEAD(&srgn->list_act_srgn);
> 
>  		srgn->rgn_idx = rgn->rgn_idx;
>  		srgn->srgn_idx = srgn_idx;
> @@ -75,6 +865,8 @@ static void ufshpb_lu_parameter_init(struct ufs_hba 
> *hba,
>  	hpb->lu_pinned_end = hpb_lu_info->num_pinned ?
>  		(hpb_lu_info->pinned_start + hpb_lu_info->num_pinned - 1)
>  		: PINNED_NOT_SET;
> +	hpb->lru_info.max_lru_active_cnt =
> +		hpb_lu_info->max_active_rgns - hpb_lu_info->num_pinned;
> 
>  	rgn_mem_size = (1ULL << hpb_dev_info->rgn_size) * HPB_RGN_SIZE_UNIT
>  			* HPB_ENTRY_SIZE;
> @@ -123,6 +915,9 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba
> *hba, struct ufshpb_lu *hpb)
>  		rgn = rgn_table + rgn_idx;
>  		rgn->rgn_idx = rgn_idx;
> 
> +		INIT_LIST_HEAD(&rgn->list_inact_rgn);
> +		INIT_LIST_HEAD(&rgn->list_lru_rgn);
> +
>  		if (rgn_idx == hpb->rgns_per_lu - 1)
>  			srgn_cnt = ((hpb->srgns_per_lu - 1) %
>  				    hpb->srgns_per_rgn) + 1;
> @@ -132,7 +927,13 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba
> *hba, struct ufshpb_lu *hpb)
>  			goto release_srgn_table;
>  		ufshpb_init_subregion_tbl(hpb, rgn);
> 
> -		rgn->rgn_state = HPB_RGN_INACTIVE;
> +		if (ufshpb_is_pinned_region(hpb, rgn_idx)) {
> +			ret = ufshpb_init_pinned_active_region(hba, hpb, rgn);
> +			if (ret)
> +				goto release_srgn_table;
> +		} else {
> +			rgn->rgn_state = HPB_RGN_INACTIVE;
> +		}
>  	}
> 
>  	return 0;
> @@ -151,13 +952,13 @@ static void ufshpb_destroy_subregion_tbl(struct
> ufshpb_lu *hpb,
>  					 struct ufshpb_region *rgn)
>  {
>  	int srgn_idx;
> +	struct ufshpb_subregion *srgn;
> 
> -	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;
> -	}
> +	for_each_sub_region(rgn, srgn_idx, srgn)
> +		if (srgn->srgn_state != HPB_SRGN_UNUSED) {
> +			srgn->srgn_state = HPB_SRGN_UNUSED;
> +			ufshpb_put_map_ctx(hpb, srgn->mctx);
> +		}
>  }
> 
>  static void ufshpb_destroy_region_tbl(struct ufshpb_lu *hpb)
> @@ -231,11 +1032,47 @@ static int ufshpb_lu_hpb_init(struct ufs_hba
> *hba, struct ufshpb_lu *hpb)
>  {
>  	int ret;
> 
> +	spin_lock_init(&hpb->rgn_state_lock);
> +	spin_lock_init(&hpb->rsp_list_lock);
> +
> +	INIT_LIST_HEAD(&hpb->lru_info.lh_lru_rgn);
> +	INIT_LIST_HEAD(&hpb->lh_act_srgn);
> +	INIT_LIST_HEAD(&hpb->lh_inact_rgn);
> +	INIT_LIST_HEAD(&hpb->list_hpb_lu);
> +
> +	INIT_WORK(&hpb->map_work, ufshpb_map_work_handler);
> +
> +	hpb->map_req_cache = kmem_cache_create("ufshpb_req_cache",
> +			  sizeof(struct ufshpb_req), 0, 0, NULL);
> +	if (!hpb->map_req_cache) {
> +		dev_err(hba->dev, "ufshpb(%d) ufshpb_req_cache create fail",
> +			hpb->lun);
> +		return -ENOMEM;
> +	}
> +
> +	hpb->m_page_cache = kmem_cache_create("ufshpb_m_page_cache",
> +			  sizeof(struct page *) * hpb->pages_per_srgn,
> +			  0, 0, NULL);
> +	if (!hpb->m_page_cache) {
> +		dev_err(hba->dev, "ufshpb(%d) ufshpb_m_page_cache create fail",
> +			hpb->lun);
> +		ret = -ENOMEM;
> +		goto release_req_cache;
> +	}
> +
>  	ret = ufshpb_alloc_region_tbl(hba, hpb);
> +	if (ret)
> +		goto release_m_page_cache;
> 
>  	ufshpb_stat_init(hpb);
> 
>  	return 0;
> +
> +release_m_page_cache:
> +	kmem_cache_destroy(hpb->m_page_cache);
> +release_req_cache:
> +	kmem_cache_destroy(hpb->map_req_cache);
> +	return ret;
>  }
> 
>  static struct ufshpb_lu *ufshpb_alloc_hpb_lu(struct ufs_hba *hba, int 
> lun,
> @@ -266,6 +1103,33 @@ static struct ufshpb_lu
> *ufshpb_alloc_hpb_lu(struct ufs_hba *hba, int lun,
>  	return NULL;
>  }
> 
> +static void ufshpb_discard_rsp_lists(struct ufshpb_lu *hpb)
> +{
> +	struct ufshpb_region *rgn, *next_rgn;
> +	struct ufshpb_subregion *srgn, *next_srgn;
> +	unsigned long flags;
> +
> +	/*
> +	 * If the device reset occurred, the remained HPB region information
> +	 * may be stale. Therefore, by dicarding the lists of HPB response
> +	 * that remained after reset, it prevents unnecessary work.
> +	 */
> +	spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> +	list_for_each_entry_safe(rgn, next_rgn, &hpb->lh_inact_rgn,
> +				 list_inact_rgn)
> +		list_del_init(&rgn->list_inact_rgn);
> +
> +	list_for_each_entry_safe(srgn, next_srgn, &hpb->lh_act_srgn,
> +				 list_act_srgn)
> +		list_del_init(&srgn->list_act_srgn);
> +	spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> +}
> +
> +static void ufshpb_cancel_jobs(struct ufshpb_lu *hpb)
> +{
> +	cancel_work_sync(&hpb->map_work);
> +}
> +
>  static bool ufshpb_check_hpb_reset_query(struct ufs_hba *hba)
>  {
>  	int err = 0;
> @@ -309,7 +1173,7 @@ void ufshpb_reset(struct ufs_hba *hba)
>  	struct scsi_device *sdev;
> 
>  	shost_for_each_device(sdev, hba->host) {
> -		hpb = sdev->hostdata;
> +		hpb = ufshpb_get_hpb_data(sdev);
>  		if (!hpb)
>  			continue;
> 
> @@ -326,13 +1190,15 @@ void ufshpb_reset_host(struct ufs_hba *hba)
>  	struct scsi_device *sdev;
> 
>  	shost_for_each_device(sdev, hba->host) {
> -		hpb = sdev->hostdata;
> +		hpb = ufshpb_get_hpb_data(sdev);
>  		if (!hpb)
>  			continue;
> 
>  		if (ufshpb_get_state(hpb) != HPB_PRESENT)
>  			continue;
>  		ufshpb_set_state(hpb, HPB_RESET);
> +		ufshpb_cancel_jobs(hpb);
> +		ufshpb_discard_rsp_lists(hpb);
>  	}
>  }
> 
> @@ -342,13 +1208,14 @@ void ufshpb_suspend(struct ufs_hba *hba)
>  	struct scsi_device *sdev;
> 
>  	shost_for_each_device(sdev, hba->host) {
> -		hpb = sdev->hostdata;
> +		hpb = ufshpb_get_hpb_data(sdev);
>  		if (!hpb)
>  			continue;
> 
>  		if (ufshpb_get_state(hpb) != HPB_PRESENT)
>  			continue;
>  		ufshpb_set_state(hpb, HPB_SUSPEND);
> +		ufshpb_cancel_jobs(hpb);
>  	}
>  }
> 
> @@ -358,7 +1225,7 @@ void ufshpb_resume(struct ufs_hba *hba)
>  	struct scsi_device *sdev;
> 
>  	shost_for_each_device(sdev, hba->host) {
> -		hpb = sdev->hostdata;
> +		hpb = ufshpb_get_hpb_data(sdev);
>  		if (!hpb)
>  			continue;
> 
> @@ -366,6 +1233,7 @@ void ufshpb_resume(struct ufs_hba *hba)
>  		    (ufshpb_get_state(hpb) != HPB_SUSPEND))
>  			continue;
>  		ufshpb_set_state(hpb, HPB_PRESENT);
> +		ufshpb_kick_map_work(hpb);
>  	}
>  }
> 
> @@ -418,7 +1286,7 @@ static int ufshpb_get_lu_info(struct ufs_hba *hba, 
> int lun,
> 
>  void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev)
>  {
> -	struct ufshpb_lu *hpb = sdev->hostdata;
> +	struct ufshpb_lu *hpb = ufshpb_get_hpb_data(sdev);
> 
>  	if (!hpb)
>  		return;
> @@ -428,8 +1296,13 @@ void ufshpb_destroy_lu(struct ufs_hba *hba,
> struct scsi_device *sdev)
>  	sdev = hpb->sdev_ufs_lu;
>  	sdev->hostdata = NULL;
> 
> +	ufshpb_cancel_jobs(hpb);
> +
>  	ufshpb_destroy_region_tbl(hpb);
> 
> +	kmem_cache_destroy(hpb->map_req_cache);
> +	kmem_cache_destroy(hpb->m_page_cache);
> +
>  	list_del_init(&hpb->list_hpb_lu);
> 
>  	kfree(hpb);
> @@ -437,24 +1310,41 @@ void ufshpb_destroy_lu(struct ufs_hba *hba,
> struct scsi_device *sdev)
> 
>  static void ufshpb_hpb_lu_prepared(struct ufs_hba *hba)
>  {
> +	int pool_size;
>  	struct ufshpb_lu *hpb;
>  	struct scsi_device *sdev;
>  	bool init_success;
> 
> +	if (tot_active_srgn_pages == 0) {
> +		ufshpb_remove(hba);
> +		return;
> +	}
> +
>  	init_success = !ufshpb_check_hpb_reset_query(hba);
> 
> +	pool_size = PAGE_ALIGN(ufshpb_host_map_kbytes * 1024) / PAGE_SIZE;
> +	if (pool_size > tot_active_srgn_pages) {
> +		mempool_resize(ufshpb_mctx_pool, tot_active_srgn_pages);
> +		mempool_resize(ufshpb_page_pool, tot_active_srgn_pages);
> +	}
> +
>  	shost_for_each_device(sdev, hba->host) {
> -		hpb = sdev->hostdata;
> +		hpb = ufshpb_get_hpb_data(sdev);
>  		if (!hpb)
>  			continue;
> 
>  		if (init_success) {
>  			ufshpb_set_state(hpb, HPB_PRESENT);
> +			if ((hpb->lu_pinned_end - hpb->lu_pinned_start) > 0)
> +				queue_work(ufshpb_wq, &hpb->map_work);
>  		} else {
>  			dev_err(hba->dev, "destroy HPB lu %d\n", hpb->lun);
>  			ufshpb_destroy_lu(hba, sdev);
>  		}
>  	}
> +
> +	if (!init_success)
> +		ufshpb_remove(hba);
>  }
> 
>  void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device *sdev)
> @@ -476,6 +1366,9 @@ void ufshpb_init_hpb_lu(struct ufs_hba *hba,
> struct scsi_device *sdev)
>  	if (!hpb)
>  		goto out;
> 
> +	tot_active_srgn_pages += hpb_lu_info.max_active_rgns *
> +			hpb->srgns_per_rgn * hpb->pages_per_srgn;
> +
>  	hpb->sdev_ufs_lu = sdev;
>  	sdev->hostdata = hpb;
> 
> @@ -485,6 +1378,57 @@ void ufshpb_init_hpb_lu(struct ufs_hba *hba,
> struct scsi_device *sdev)
>  		ufshpb_hpb_lu_prepared(hba);
>  }
> 
> +static int ufshpb_init_mem_wq(void)
> +{
> +	int ret;
> +	unsigned int pool_size;
> +
> +	ufshpb_mctx_cache = kmem_cache_create("ufshpb_mctx_cache",
> +					sizeof(struct ufshpb_map_ctx),
> +					0, 0, NULL);
> +	if (!ufshpb_mctx_cache) {
> +		pr_err("ufshpb: cannot init mctx cache\n");
> +		return -ENOMEM;
> +	}
> +
> +	pool_size = PAGE_ALIGN(ufshpb_host_map_kbytes * 1024) / PAGE_SIZE;
> +	pr_info("%s:%d ufshpb_host_map_kbytes %u pool_size %u\n",
> +	       __func__, __LINE__, ufshpb_host_map_kbytes, pool_size);
> +
> +	ufshpb_mctx_pool = mempool_create_slab_pool(pool_size,
> +						    ufshpb_mctx_cache);
> +	if (!ufshpb_mctx_pool) {
> +		pr_err("ufshpb: cannot init mctx pool\n");
> +		ret = -ENOMEM;
> +		goto release_mctx_cache;
> +	}
> +
> +	ufshpb_page_pool = mempool_create_page_pool(pool_size, 0);
> +	if (!ufshpb_page_pool) {
> +		pr_err("ufshpb: cannot init page pool\n");
> +		ret = -ENOMEM;
> +		goto release_mctx_pool;
> +	}
> +
> +	ufshpb_wq = alloc_workqueue("ufshpb-wq",
> +					WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
> +	if (!ufshpb_wq) {
> +		pr_err("ufshpb: alloc workqueue failed\n");
> +		ret = -ENOMEM;
> +		goto release_page_pool;
> +	}
> +
> +	return 0;
> +
> +release_page_pool:
> +	mempool_destroy(ufshpb_page_pool);
> +release_mctx_pool:
> +	mempool_destroy(ufshpb_mctx_pool);
> +release_mctx_cache:
> +	kmem_cache_destroy(ufshpb_mctx_cache);
> +	return ret;
> +}
> +
>  void ufshpb_get_geo_info(struct ufs_hba *hba, u8 *geo_buf)
>  {
>  	struct ufshpb_dev_info *hpb_dev_info = &hba->ufshpb_dev;
> @@ -550,7 +1494,13 @@ void ufshpb_init(struct ufs_hba *hba)
>  	if (!ufshpb_is_allowed(hba))
>  		return;
> 
> +	if (ufshpb_init_mem_wq()) {
> +		hpb_dev_info->hpb_disabled = true;
> +		return;
> +	}
> +
>  	atomic_set(&hpb_dev_info->slave_conf_cnt, hpb_dev_info->num_lu);
> +	tot_active_srgn_pages = 0;
>  	/* issue HPB reset query */
>  	for (try = 0; try < HPB_RESET_REQ_RETRIES; try++) {
>  		ret = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
> @@ -559,3 +1509,16 @@ void ufshpb_init(struct ufs_hba *hba)
>  			break;
>  	}
>  }
> +
> +void ufshpb_remove(struct ufs_hba *hba)
> +{
> +	mempool_destroy(ufshpb_page_pool);
> +	mempool_destroy(ufshpb_mctx_pool);
> +	kmem_cache_destroy(ufshpb_mctx_cache);
> +
> +	destroy_workqueue(ufshpb_wq);
> +}
> +
> +module_param(ufshpb_host_map_kbytes, uint, 0644);
> +MODULE_PARM_DESC(ufshpb_host_map_kbytes,
> +	"ufshpb host mapping memory kilo-bytes for ufshpb memory-pool");
> diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
> index 50523821cac8..e40b016971ac 100644
> --- a/drivers/scsi/ufs/ufshpb.h
> +++ b/drivers/scsi/ufs/ufshpb.h
> @@ -83,10 +83,19 @@ struct ufshpb_lu_info {
>  	int max_active_rgns;
>  };
> 
> +struct ufshpb_map_ctx {
> +	struct page **m_page;
> +	unsigned long *ppn_dirty;
> +};
> +
>  struct ufshpb_subregion {
> +	struct ufshpb_map_ctx *mctx;
>  	enum HPB_SRGN_STATE srgn_state;
>  	int rgn_idx;
>  	int srgn_idx;
> +
> +	/* below information is used by rsp_list */
> +	struct list_head list_act_srgn;
>  };
> 
>  struct ufshpb_region {
> @@ -94,6 +103,43 @@ struct ufshpb_region {
>  	enum HPB_RGN_STATE rgn_state;
>  	int rgn_idx;
>  	int srgn_cnt;
> +
> +	/* below information is used by rsp_list */
> +	struct list_head list_inact_rgn;
> +
> +	/* below information is used by lru */
> +	struct list_head list_lru_rgn;
> +};
> +
> +#define for_each_sub_region(rgn, i, srgn)				\
> +	for ((i) = 0;							\
> +	     ((i) < (rgn)->srgn_cnt) && ((srgn) = &(rgn)->srgn_tbl[i]); \
> +	     (i)++)
> +
> +/**
> + * struct ufshpb_req - UFSHPB READ BUFFER (for caching map) request 
> structure
> + * @req: block layer request for READ BUFFER
> + * @bio: bio for holding map page
> + * @hpb: ufshpb_lu structure that related to the L2P map
> + * @mctx: L2P map information
> + * @rgn_idx: target region index
> + * @srgn_idx: target sub-region index
> + * @lun: target logical unit number
> + */
> +struct ufshpb_req {
> +	struct request *req;
> +	struct bio *bio;
> +	struct ufshpb_lu *hpb;
> +	struct ufshpb_map_ctx *mctx;
> +
> +	unsigned int rgn_idx;
> +	unsigned int srgn_idx;
> +};
> +
> +struct victim_select_info {
> +	struct list_head lh_lru_rgn; /* LRU list of regions */
> +	int max_lru_active_cnt; /* supported hpb #region - pinned #region */
> +	atomic_t active_cnt;
>  };
> 
>  struct ufshpb_stats {
> @@ -108,10 +154,22 @@ struct ufshpb_stats {
>  struct ufshpb_lu {
>  	int lun;
>  	struct scsi_device *sdev_ufs_lu;
> +
> +	spinlock_t rgn_state_lock; /* for protect rgn/srgn state */
>  	struct ufshpb_region *rgn_tbl;
> 
>  	atomic_t hpb_state;
> 
> +	spinlock_t rsp_list_lock;
> +	struct list_head lh_act_srgn; /* hold rsp_list_lock */
> +	struct list_head lh_inact_rgn; /* hold rsp_list_lock */
> +
> +	/* cached L2P map management worker */
> +	struct work_struct map_work;
> +
> +	/* for selecting victim */
> +	struct victim_select_info lru_info;
> +
>  	/* pinned region information */
>  	u32 lu_pinned_start;
>  	u32 lu_pinned_end;
> @@ -130,6 +188,9 @@ struct ufshpb_lu {
> 
>  	struct ufshpb_stats stats;
> 
> +	struct kmem_cache *map_req_cache;
> +	struct kmem_cache *m_page_cache;
> +
>  	struct list_head list_hpb_lu;
>  };
> 
> @@ -137,6 +198,7 @@ struct ufs_hba;
>  struct ufshcd_lrb;
> 
>  #ifndef CONFIG_SCSI_UFS_HPB
> +static void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb 
> *lrbp) {}
>  static void ufshpb_resume(struct ufs_hba *hba) {}
>  static void ufshpb_suspend(struct ufs_hba *hba) {}
>  static void ufshpb_reset(struct ufs_hba *hba) {}
> @@ -144,10 +206,12 @@ static void ufshpb_reset_host(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 void ufshpb_remove(struct ufs_hba *hba) {}
>  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_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp);
>  void ufshpb_resume(struct ufs_hba *hba);
>  void ufshpb_suspend(struct ufs_hba *hba);
>  void ufshpb_reset(struct ufs_hba *hba);
> @@ -155,6 +219,7 @@ 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);