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

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Date:   Sun, 24 Jul 2022 07:21:42 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     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_asutoshd@...cinc.com" <quic_asutoshd@...cinc.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

> +void ufshcd_mcq_config_mac(struct ufs_hba *hba)
> +{
> +       u32 val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
> +
> +       val &= ~MCQ_CFG_MAC_MASK;
> +       val |= hba->dev_info.bqueuedepth << MCQ_CFG_MAC_OFFSET;
> +       ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);
Arbitration scheme is something that I would expect to be configurable.
Or at least, add a comment explicitly saying that you choose a round-robin arbitration scheme.

Thanks,
Avri