linux-kernel - RE: [PATCH v21 4/4] scsi: ufs: Add HPB 2.0 support

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Date:   Sat, 20 Feb 2021 14:33:42 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "huobean@...il.com" <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        JinHwan Park <jh.i.park@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>,
        SEUNGUK SHIN <seunguk.shin@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>
Subject: RE: [PATCH v21 4/4] scsi: ufs: Add HPB 2.0 support


>         kmem_cache_destroy(hpb->map_req_cache);
> @@ -1670,7 +2109,7 @@ void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct
> scsi_device *sdev)
>         if (ret)
>                 goto out;
> 
> -       hpb = ufshpb_alloc_hpb_lu(hba, lun, &hba->ufshpb_dev,
> +       hpb = ufshpb_alloc_hpb_lu(hba, sdev, &hba->ufshpb_dev,
>                                   &hpb_lu_info);
>         if (!hpb)
>                 goto out;
In HPB2.0 device control mode, the host is expected to send HPB-WRITE-BUFFER 0x3
To informs that all HPB Regions are inactive (expect for pinned regions).
Maybe a good place to do so is here, or in ufshpb_hpb_lu_prepared after you kicked the map work for pinned regions.

Either way, If you decide to do so, I would appreciate if you could align to the framework I proposed in
(scsi: ufshpb: Region inactivation in host mode).
This way you would have a wrapper unmap_all that would call ufshpb_issue_umap_req with buffer id 0x3,
And I would have a wrapper unmap_single that would call it with buffer id 0x1.

Thanks,
Avri