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

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Date:   Fri, 22 Jul 2022 14:42:23 +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

>                                       desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1];
> +
> +       dev_info->bqueuedepth = desc_buf[DEVICE_DESC_PARAM_Q_DPTH];
> +
>         b_ufs_feature_sup = desc_buf[DEVICE_DESC_PARAM_UFS_FEAT];
> 
>         model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];
> @@ -8184,6 +8315,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
> bool init_dev_params)
>                 ret = ufshcd_device_params_init(hba);
>                 if (ret)
>                         goto out;
> +
> +               if (is_mcq_enabled(hba) && hba->dev_info.bqueuedepth)
> +                       ufshcd_mcq_config_mac(hba);
>         }
So what happens if the device does not implements the shared queueing architecture.
MCQ is still enabled?

Thanks,
Avri