linux-kernel - Re: [PATCH v4] scsi: ufs: core: Add trace event for MCQ

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Date:   Fri, 3 Mar 2023 10:01:38 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Ziqi Chen <quic_ziqichen@...cinc.com>, quic_asutoshd@...cinc.com,
        quic_cang@...cinc.com, mani@...nel.org, stanley.chu@...iatek.com,
        adrian.hunter@...el.com, beanhuo@...ron.com, avri.altman@....com,
        junwoo80.lee@...sung.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:TRACING" <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] scsi: ufs: core: Add trace event for MCQ

On 3/3/23 01:35, Ziqi Chen wrote:
> -	doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
> -	trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
> -			doorbell, transfer_len, intr, lba, opcode, group_id);
> +
> +	if (is_mcq_enabled(hba)) {
> +		hwq = ufshcd_mcq_req_to_hwq(hba, rq);
> +		trace_ufshcd_command_mcq(dev_name(hba->dev), str_t, tag,
> +				hwq, transfer_len, intr, lba, opcode, group_id);
> +	} else {
> +		doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
> +		trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
> +				doorbell, transfer_len, intr, lba, opcode, group_id);
> +	}
>   }
Users will hate it if the trace events for legacy mode and MCQ mode are 
different. Instead of defining a new trace event for the MCQ mode, I 
think we need to add the MCQ information in the existing trace event.

Thanks,

Bart.