linux-kernel - RE: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

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Message-ID: <DM6PR04MB6575B4E2707200BDFFEE4A08FC909@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Fri, 22 Jul 2022 19:37:05 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "Asutosh Das (asd)" <quic_asutoshd@...cinc.com>,
        Can Guo <quic_cang@...cinc.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
        "quic_ziqichen@...cinc.com" <quic_ziqichen@...cinc.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>
CC:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Daejun Park <daejun7.park@...sung.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] scsi: ufs: Add Multi-Circular Queue support

> >> +
> >> +       /* Manually allocate MCQ resource */
> > Did you consider to force providing the MCQ configuration?
How about this one?

> > Is it possible, since MCQ memory space is *added* to the UTR & UTMR
> > lists, That we'll keep using the legacy doorbell for query commands?
> > Wouldn't it will simplify the hw_queue bookkeeping
> >
> Umm, I didn't understand this suggestion. Please can you elaborate a bit.
> When MCQ mode is selected the Config.QT is set to 1.
> So how would we keep using the legacy doorbell for query commands?
Sorry - my bad.
Thanks for clarifying.

Thanks,
Avri