linux-kernel - Re: [PATCH v5 05/10] scsi: ufshpb: Region inactivation in host mode

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Date:   Thu, 11 Mar 2021 16:20:53 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Avri Altman <avri.altman@....com>
Cc:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, Bart Van Assche <bvanassche@....org>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        alim.akhtar@...sung.com, asutoshd@...eaurora.org,
        Zang Leigang <zangleigang@...ilicon.com>,
        Avi Shchislowski <avi.shchislowski@....com>,
        Bean Huo <beanhuo@...ron.com>, stanley.chu@...iatek.com
Subject: Re: [PATCH v5 05/10] scsi: ufshpb: Region inactivation in host mode

On 2021-03-02 21:24, Avri Altman wrote:
> I host mode, the host is expected to send HPB-WRITE-BUFFER with

In host mode,

> buffer-id = 0x1 when it inactivates a region.
> 
> Use the map-requests pool as there is no point in assigning a
> designated cache for umap-requests.
> 
> Signed-off-by: Avri Altman <avri.altman@....com>
> ---
>  drivers/scsi/ufs/ufshpb.c | 14 ++++++++++++++
>  drivers/scsi/ufs/ufshpb.h |  1 +
>  2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> index 6f4fd22eaf2f..0744feb4d484 100644
> --- a/drivers/scsi/ufs/ufshpb.c
> +++ b/drivers/scsi/ufs/ufshpb.c
> @@ -907,6 +907,7 @@ static int ufshpb_execute_umap_req(struct ufshpb_lu 
> *hpb,
> 
>  	blk_execute_rq_nowait(q, NULL, req, 1, ufshpb_umap_req_compl_fn);
> 
> +	hpb->stats.umap_req_cnt++;
>  	return 0;
>  }
> 
> @@ -1103,6 +1104,12 @@ static int ufshpb_issue_umap_req(struct 
> ufshpb_lu *hpb,
>  	return -EAGAIN;
>  }
> 
> +static int ufshpb_issue_umap_single_req(struct ufshpb_lu *hpb,
> +					struct ufshpb_region *rgn)
> +{
> +	return ufshpb_issue_umap_req(hpb, rgn);
> +}
> +
>  static int ufshpb_issue_umap_all_req(struct ufshpb_lu *hpb)
>  {
>  	return ufshpb_issue_umap_req(hpb, NULL);
> @@ -1115,6 +1122,10 @@ static void __ufshpb_evict_region(struct 
> ufshpb_lu *hpb,
>  	struct ufshpb_subregion *srgn;
>  	int srgn_idx;
> 
> +

No need of this blank line.

Regards,
Can Guo.

> +	if (hpb->is_hcm && ufshpb_issue_umap_single_req(hpb, rgn))
> +		return;
> +
>  	lru_info = &hpb->lru_info;
> 
>  	dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "evict region %d\n", 
> rgn->rgn_idx);
> @@ -1855,6 +1866,7 @@ 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);
> +ufshpb_sysfs_attr_show_func(umap_req_cnt);
> 
>  static struct attribute *hpb_dev_stat_attrs[] = {
>  	&dev_attr_hit_cnt.attr,
> @@ -1863,6 +1875,7 @@ static struct attribute *hpb_dev_stat_attrs[] = {
>  	&dev_attr_rb_active_cnt.attr,
>  	&dev_attr_rb_inactive_cnt.attr,
>  	&dev_attr_map_req_cnt.attr,
> +	&dev_attr_umap_req_cnt.attr,
>  	NULL,
>  };
> 
> @@ -1978,6 +1991,7 @@ static void ufshpb_stat_init(struct ufshpb_lu 
> *hpb)
>  	hpb->stats.rb_active_cnt = 0;
>  	hpb->stats.rb_inactive_cnt = 0;
>  	hpb->stats.map_req_cnt = 0;
> +	hpb->stats.umap_req_cnt = 0;
>  }
> 
>  static void ufshpb_param_init(struct ufshpb_lu *hpb)
> diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
> index bd4308010466..84598a317897 100644
> --- a/drivers/scsi/ufs/ufshpb.h
> +++ b/drivers/scsi/ufs/ufshpb.h
> @@ -186,6 +186,7 @@ struct ufshpb_stats {
>  	u64 rb_inactive_cnt;
>  	u64 map_req_cnt;
>  	u64 pre_req_cnt;
> +	u64 umap_req_cnt;
>  };
> 
>  struct ufshpb_lu {