linux-kernel - Re: [PATCH v2 1/3] scsi: ufs: core: Introduce mcq ops to config cqid

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Message-ID: <14a23717-b517-3d7d-bd5b-17e265dffe82@collabora.com>
Date:   Tue, 30 May 2023 09:20:45 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Po-Wen Kao <powen.kao@...iatek.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     wsd_upstream@...iatek.com, peter.wang@...iatek.com,
        stanley.chu@...iatek.com, alice.chao@...iatek.com,
        naomi.chu@...iatek.com, chun-hung.wu@...iatek.com,
        cc.chou@...iatek.com, eddie.huang@...iatek.com
Subject: Re: [PATCH v2 1/3] scsi: ufs: core: Introduce mcq ops to config cqid

Il 30/05/23 04:32, Po-Wen Kao ha scritto:
> From: Peter Wang <peter.wang@...iatek.com>
> 
> MCQ sq/cq mapping is not just one for one, could many for one.
> This patch allow host driver to change the mapping, assign cqid
> for each hw queue.
> 
> Signed-off-by: Po-Wen Kao <powen.kao@...iatek.com>
> Signed-off-by: Peter Wang <peter.wang@...iatek.com>
> ---
>   drivers/ufs/core/ufs-mcq.c     |  2 +-
>   drivers/ufs/core/ufshcd-priv.h |  8 ++++++++
>   drivers/ufs/core/ufshcd.c      | 11 +++++++++++
>   include/ufs/ufshcd.h           |  3 +++
>   4 files changed, 23 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c
> index 51b3c6ae781d..1ba9c395c6b0 100644
> --- a/drivers/ufs/core/ufs-mcq.c
> +++ b/drivers/ufs/core/ufs-mcq.c
> @@ -368,7 +368,7 @@ void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba)
>   		 * Submission Queue Attribute
>   		 */
>   		ufsmcq_writel(hba, (1 << QUEUE_EN_OFFSET) | qsize |
> -			      (i << QUEUE_ID_OFFSET),
> +			      (hwq->cqid << QUEUE_ID_OFFSET),
>   			      MCQ_CFG_n(REG_SQATTR, i));
>   	}
>   }
> diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
> index d53b93c21a0c..2de068b96c71 100644
> --- a/drivers/ufs/core/ufshcd-priv.h
> +++ b/drivers/ufs/core/ufshcd-priv.h
> @@ -287,6 +287,14 @@ static inline int ufshcd_mcq_vops_config_esi(struct ufs_hba *hba)
>   	return -EOPNOTSUPP;
>   }
>   
> +static inline int ufshcd_mcq_vops_config_cqid(struct ufs_hba *hba)
> +{
> +	if (hba->vops && hba->vops->config_cqid)
> +		return hba->vops->config_cqid(hba);
> +
> +	return -EOPNOTSUPP;
> +}
> +
>   extern const struct ufs_pm_lvl_states ufs_pm_lvl_states[];
>   
>   /**
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 4ec8dacb447c..fad9ff4469b0 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8488,11 +8488,22 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
>   static void ufshcd_config_mcq(struct ufs_hba *hba)
>   {
>   	int ret;
> +	struct ufs_hw_queue *hwq;
> +	int i;
>   
>   	ret = ufshcd_mcq_vops_config_esi(hba);
>   	dev_info(hba->dev, "ESI %sconfigured\n", ret ? "is not " : "");
>   
>   	ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
> +
> +	ret = ufshcd_mcq_vops_config_cqid(hba);
> +	if (ret) {

If your return value here is not -EOPNOTSUPP you may want to perform some
different action... and perhaps ufshcd_config_mcq() should be changed to
return a failure.
Should also be trivial to do so, since this function is called 3 times in
total, and only in ufshcd_device_init(), which is already returning int.

So, I would say....

static int ufshcd_config_mcq(struct ufs_hba *hba)
{

..... code .....

	ret = ufshcd_mcq_vops_config_cqid(hba);
	if (ret) {
		if (ret != -EOPNOTSUPP)
			return ret;

		/* No special configuration, go for 1:1 mapping */
		for (i = 0; ....)
			....
	}

Regards,
Angelo