linux-kernel - Re: [PATCH v2 4/7] scsi: ufs: core: Add hwq print for debug

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Date:   Thu, 23 Feb 2023 18:14:41 +0800
From:   Ziqi Chen <quic_ziqichen@...cinc.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>,
        <mason.zhang@...iatek.com>, <chaotian.jing@...iatek.com>,
        <jiajie.hao@...iatek.com>
Subject: Re: [PATCH v2 4/7] scsi: ufs: core: Add hwq print for debug

Hi Po-Wen,

On 2/22/2023 11:04 AM, Po-Wen Kao wrote:
> +void ufshcd_mcq_print_hwqs(struct ufs_hba *hba, unsigned long bitmap)
> +{
> +	int id, i;
> +	char prefix[15];
> +
> +	if (!is_mcq_enabled(hba))
> +		return;
> +
> +	for_each_set_bit(id, &bitmap, hba->nr_hw_queues) {
> +		snprintf(prefix, sizeof(prefix), "q%d SQCFG: ", id);
> +		ufshcd_hex_dump(prefix,
> +			hba->mcq_base + MCQ_QCFG_SIZE * id, MCQ_QCFG_SQ_SIZE);

Is your purpose dump per hardware queue registers here?  If yes, why 
don't use ufsmcq_readl() to save to a buffer and then use ufshcd_hex_dump()

to dump ? Are you sure ufshcd_hex_dump() can dump register directly?

> +
> +		snprintf(prefix, sizeof(prefix), "q%d CQCFG: ", id);
> +		ufshcd_hex_dump(prefix,
> +			hba->mcq_base + MCQ_QCFG_SIZE * id + MCQ_QCFG_SQ_SIZE, MCQ_QCFG_CQ_SIZE);
Same to above comment.
> +
> +		for (i = 0; i < OPR_MAX ; i++) {
> +			snprintf(prefix, sizeof(prefix), "q%d OPR%d: ", id, i);
> +			ufshcd_hex_dump(prefix, mcq_opr_base(hba, i, id), mcq_opr_size[i]);
Same.
> +		}
> +	}
> +}
> +
>
>   
> @@ -574,7 +569,16 @@ void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt)
>   		if (pr_prdt)
>   			ufshcd_hex_dump("UPIU PRDT: ", lrbp->ucd_prdt_ptr,
>   				ufshcd_sg_entry_size(hba) * prdt_length);
> +
> +		if (is_mcq_enabled(hba)) {
> +			cmd = lrbp->cmd;
> +			if (!cmd)
> +				return;
> +			hwq = ufshcd_mcq_req_to_hwq(hba, scsi_cmd_to_rq(cmd));
> +			ufshcd_mcq_print_hwqs(hba, 1 << hwq->id);

Calling registers dump function in ufshcd_print_trs() is not reasonable, 
eg.. for each aborted request, it would print out all hwq registers, 
it's not make sense.

I think we should move it out of ufshcd_print_trs().

> +		}
>   	}
> +
>   }


Best Regards,

Ziqi