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

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Date:   Mon, 28 Nov 2022 14:08:42 -0800
From:   Asutosh Das <quic_asutoshd@...cinc.com>
To:     Bart Van Assche <bvanassche@....org>
CC:     <quic_cang@...cinc.com>, <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <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 Fri, Nov 25 2022 at 17:28 -0800, Bart Van Assche wrote:
>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);
>>+}
>
Hello Bart,

>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.

Now it is queued to device management command queue in MCQ mode.
However, a task tag is needed for device management commands.
Do you mean that the task tag of device management command be default to 0
instead in MCQ mode?

>
>Thanks,
>
>Bart.