linux-kernel - Re: [PATCH v5 09/16] ufs: core: mcq: Configure operation and runtime interface

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Message-ID: <ef519087-c302-3547-1419-2dcddfb4c646@acm.org>
Date:   Fri, 25 Nov 2022 17:28:12 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Asutosh Das <quic_asutoshd@...cinc.com>, quic_cang@...cinc.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org
Cc:     quic_nguyenb@...cinc.com, quic_xiaosenh@...cinc.com,
        stanley.chu@...iatek.com, eddie.huang@...iatek.com,
        daejun7.park@...sung.com, avri.altman@....com, mani@...nel.org,
        beanhuo@...ron.com, linux-arm-msm@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Arthur Simchaev <Arthur.Simchaev@....com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 09/16] ufs: core: mcq: Configure operation and runtime
 interface

On 11/22/22 20:10, Asutosh Das wrote:
> +static void ufshcd_config_mcq(struct ufs_hba *hba)
> +{
> +	ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
> +	ufshcd_mcq_make_queues_operational(hba);
> +	ufshcd_mcq_config_mac(hba, hba->nutrs);
> +
> +	hba->host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
> +	hba->reserved_slot = hba->nutrs - UFSHCD_NUM_RESERVED;
> +	dev_info(hba->dev, "MCQ configured, nr_queues=%d, io_queues=%d, read_queue=%d, poll_queues=%d, queue_depth=%d\n",
> +		 hba->nr_hw_queues, hba->nr_queues[HCTX_TYPE_DEFAULT],
> +		 hba->nr_queues[HCTX_TYPE_READ], hba->nr_queues[HCTX_TYPE_POLL],
> +		 hba->nutrs);
> +}

Please do not reserve a slot for device commands in MCQ mode but instead 
queue device management commands on the device management command queue 
in MCQ mode. Please also add WARN_ON_ONCE() statements in the code that 
uses hba->reserved_slot to make sure that that variable is not used in 
MCQ mode.

Thanks,

Bart.