linux-kernel - Re: [PATCH 0/3] scsi: ufs-qcom: Enable Dumping of Hibern8, MCQ, and Testbus Registers

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Message-ID: <20241210061430.fmj5d6xyqgtqm3jc@thinkpad>
Date: Tue, 10 Dec 2024 11:44:30 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Bart Van Assche <bvanassche@....org>
Cc: Manivannan Sadhasivam <manisadhasivam.linux@...il.com>,
	Manish Pandey <quic_mapa@...cinc.com>,
	"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
Subject: Re: [PATCH 0/3] scsi: ufs-qcom: Enable Dumping of Hibern8, MCQ, and
 Testbus Registers

On Mon, Dec 09, 2024 at 10:35:39AM -0800, Bart Van Assche wrote:
> On 12/8/24 12:03 PM, Manivannan Sadhasivam wrote:
> > On Tue, Nov 12, 2024 at 10:10:02AM -0800, Bart Van Assche wrote:
> > > On 11/11/24 11:50 PM, Manivannan Sadhasivam wrote:
> > > > On Fri, Oct 25, 2024 at 11:20:51AM +0530, Manish Pandey wrote:
> > > > > Submitting a series of patches aimed at enhancing the debugging and monitoring capabilities
> > > > > of the UFS-QCOM driver. These patches introduce new functionalities that will significantly
> > > > > aid in diagnosing and resolving issues related to hardware and software operations.
> > > > > 
> > > > 
> > > > TBH, the current state of dumping UFSHC registers itself is just annoying as it
> > > > pollutes the kernel ring buffer. I don't think any peripheral driver in the
> > > > kernel does this. Please dump only relevant registers, not everything that you
> > > > feel like dumping.
> > > 
> > > I wouldn't mind if the code for dumping  UFSHC registers would be removed.
> > 
> > Instead of removing, I'm planning to move the dump to dev_coredump framework.
> > But should we move all the error prints also? Like all ufshcd_print_*()
> > functions?
> 
> Hmm ... we may be better off to check which of these functions can be
> removed rather than moving all of them to another framework.
> 

They are mostly for debugging the errors. I don't see why we should completely
get rid of them. Moving to devcoredump allows debugging the errors in a
standardized way and also prevents spamming the kernel ring buffer.

- Mani

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