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

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Message-ID: <DM6PR04MB65756C5A6C5F674B19091F7DFC939@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Sat, 23 Jul 2022 21:23:57 +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

>  static inline
> -void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
> +void ufshcd_send_command(struct ufs_hba *hba, struct ufshcd_lrb *lrbp,
> +                        struct ufs_hw_queue *hwq)
>  {
> -       struct ufshcd_lrb *lrbp = &hba->lrb[task_tag];
>         unsigned long flags;
> 
>         lrbp->issue_time_stamp = ktime_get();
>         lrbp->compl_time_stamp = ktime_set(0, 0);
> -       ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND);
> +       ufshcd_add_command_trace(hba, lrbp, UFS_CMD_SEND);
>         ufshcd_clk_scaling_start_busy(hba);
>         if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
>                 ufshcd_start_monitor(hba, lrbp);
> 
> -       spin_lock_irqsave(&hba->outstanding_lock, flags);
> -       if (hba->vops && hba->vops->setup_xfer_req)
> -               hba->vops->setup_xfer_req(hba, task_tag, !!lrbp->cmd);
> -       __set_bit(task_tag, &hba->outstanding_reqs);
> -       ufshcd_writel(hba, 1 << task_tag,
> REG_UTP_TRANSFER_REQ_DOOR_BELL);
> -       spin_unlock_irqrestore(&hba->outstanding_lock, flags);
> +       if (is_mcq_enabled(hba)) {
> +               int utrd_size = sizeof(struct utp_transfer_req_desc);
Maybe we can map some designated ops, so all those if (is_mcq) can be avoided in the data-path.
Also maybe we can constify sizeof(struct utp_transfer_req_desc) which is used now few times.

Thanks,
Avri