linux-kernel - Re: [PATCH v5 12/16] ufs: core: mcq: Find hardware queue to queue request

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Message-ID: <20221128160807.GK62721@thinkpad>
Date:   Mon, 28 Nov 2022 21:38:07 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Asutosh Das <quic_asutoshd@...cinc.com>
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,
        bvanassche@....org, avri.altman@....com, beanhuo@...ron.com,
        linux-arm-msm@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Arthur Simchaev <Arthur.Simchaev@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 12/16] ufs: core: mcq: Find hardware queue to queue
 request

On Tue, Nov 22, 2022 at 08:10:25PM -0800, Asutosh Das wrote:
> Adds support to find the hardware queue on which the request
> would be queued.
> Since the very first queue is to serve device commands, an offset
> of 1 is added to the index of the hardware queue.
> 
> Co-developed-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>

One small nitpick below...

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

> Reviewed-by: Bart Van Assche <bvanassche@....org>
> ---
>  drivers/ufs/core/ufs-mcq.c     | 20 ++++++++++++++++++++
>  drivers/ufs/core/ufshcd-priv.h |  3 +++
>  drivers/ufs/core/ufshcd.c      |  3 +++
>  3 files changed, 26 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 7179f86..10a0d0d7 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -94,6 +94,26 @@ static const struct ufshcd_res_info ufs_res_info[RES_MAX] = {
>  };
>  
>  /**
> + * ufshcd_mcq_req_to_hwq - find the hardware queue on which the
> + * request would be issued.
> + * @hba - per adapter instance
> + * @req - pointer to the request to be issued
> + *
> + * Returns the hardware queue instance on which the request would
> + * be queued.
> + */
> +struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
> +					 struct request *req)
> +{
> +	u32 utag = blk_mq_unique_tag(req);
> +	u32 hwq = blk_mq_unique_tag_to_hwq(utag);
> +
> +	/* uhq[0] is used to serve device commands */
> +	return &hba->uhq[hwq + UFSHCD_MCQ_IO_QUEUE_OFFSET];
> +}
> +

Remove extra newline.

Thanks,
Mani

> +
> +/**
>   * ufshcd_mcq_decide_queue_depth - decide the queue depth
>   * @hba - per adapter instance
>   *
> diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
> index 5616047..14df7ce 100644
> --- a/drivers/ufs/core/ufshcd-priv.h
> +++ b/drivers/ufs/core/ufshcd-priv.h
> @@ -67,7 +67,10 @@ int ufshcd_mcq_memory_alloc(struct ufs_hba *hba);
>  void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba);
>  void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds);
>  void ufshcd_mcq_select_mcq_mode(struct ufs_hba *hba);
> +struct ufs_hw_queue *ufshcd_mcq_req_to_hwq(struct ufs_hba *hba,
> +					   struct request *req);
>  
> +#define UFSHCD_MCQ_IO_QUEUE_OFFSET	1
>  #define SD_ASCII_STD true
>  #define SD_RAW false
>  int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 93a9e38..52c0386 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -2921,6 +2921,9 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
>  		goto out;
>  	}
>  
> +	if (is_mcq_enabled(hba))
> +		hwq = ufshcd_mcq_req_to_hwq(hba, scsi_cmd_to_rq(cmd));
> +
>  	ufshcd_send_command(hba, tag, hwq);
>  
>  out:
> -- 
> 2.7.4
> 

-- 
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