linux-kernel - Re: [PATCH V3 2/3] scsi: ufs-qcom: Add support for dumping MCQ registers

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Message-ID: <20250318064421.bvlv2xz7libxikk5@thinkpad>
Date: Tue, 18 Mar 2025 12:14:21 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Manish Pandey <quic_mapa@...cinc.com>
Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, quic_nitirawa@...cinc.com,
	quic_cang@...cinc.com, quic_nguyenb@...cinc.com
Subject: Re: [PATCH V3 2/3] scsi: ufs-qcom: Add support for dumping MCQ
 registers

On Thu, Mar 13, 2025 at 10:46:34AM +0530, Manish Pandey wrote:
> This patch adds functionality to dump MCQ registers.
> This will help in diagnosing issues related to MCQ
> operations by providing detailed register dumps.
> 

Same comment as previous patch. Also, make use of 75 column width.

> Signed-off-by: Manish Pandey <quic_mapa@...cinc.com>
> ---
> 
> Changes in v3:
> - Addressed Bart's review comments by adding explanations for the
>   in_task() and usleep_range() calls.
> Changes in v2:
> - Rebased patchsets.
> - Link to v1: https://lore.kernel.org/linux-arm-msm/20241025055054.23170-1-quic_mapa@quicinc.com/
> ---
>  drivers/ufs/host/ufs-qcom.c | 60 +++++++++++++++++++++++++++++++++++++
>  drivers/ufs/host/ufs-qcom.h |  2 ++
>  2 files changed, 62 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index f5181773c0e5..fb9da04c0d35 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1566,6 +1566,54 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host)
>  	return 0;
>  }
>  
> +static void ufs_qcom_dump_mcq_hci_regs(struct ufs_hba *hba)
> +{
> +	/* sleep intermittently to prevent CPU hog during data dumps. */
> +	/* RES_MCQ_1 */
> +	ufshcd_dump_regs(hba, 0x0, 256 * 4, "MCQ HCI 1da0000-1da03f0 ");
> +	usleep_range(1000, 1100);

If your motivation is just to not hog the CPU, use cond_resched().

- Mani

-- 
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