linux-kernel - RE: RE: [PATCH v24 4/4] scsi: ufs: Add HPB 2.0 support

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Date:   Thu, 25 Feb 2021 12:25:34 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     Avri Altman <Avri.Altman@....com>,
        Daejun Park <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: RE: [PATCH v24 4/4] scsi: ufs: Add HPB 2.0 support

> > 
> > > +static int ufshpb_issue_umap_all_req(struct ufshpb_lu *hpb)
> > Maybe ufshpb_issue_umap_all_req is just a wrapper for
> > ufshpb_issue_umap_req?
> > e.g it calls ufshpb_issue_umap_req(hpb, int read_buferr_id = 0x3) ?
> > Then on host mode inactivation:
> > static int ufshpb_issue_umap_single_req(struct ufshpb_lu *hpb)
> > {
> >         return ufshpb_issue_umap_req(hpb, 0x1);
> > }
> Better yet, ufshpb_execute_umap_req can get *rgn as an extra argument.
> ufshpb_issue_umap_all_req will call it with NULL, while
> ufshpb_issue_umap_single_req will call it with the rgn to inactivate.
> 
> Then,  ufshpb_set_unmap_cmd takes the form:
> static void ufshpb_set_unmap_cmd(unsigned char *cdb, struct ufshpb_region *rgn)
> {
>         cdb[0] = UFSHPB_WRITE_BUFFER;
> 
>         if (rgn) {
>                 cdb[1] = UFSHPB_WRITE_BUFFER_INACT_SINGLE_ID;
>                 put_unaligned_be16(rgn->rgn_idx, &cdb[2]);
>         } else {
>                 cdb[1] = UFSHPB_WRITE_BUFFER_INACT_ALL_ID;
>         }
> 
>         cdb[9] = 0x00;
> }
> 
> Does it make sense?

I got it.

Thanks,
Daejun