linux-kernel - Re: [PATCH v11 10/11] PCI: dwc: Print warning message when cpu_addr

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Message-ID: <az74rxjpfahjwmz7fg5agn47org7arpblariuauujhovkaieha@d6r2yp23vqan>
Date: Thu, 12 Jun 2025 21:38:32 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Frank Li <Frank.li@....com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh@...nel.org>, 
	Saravana Kannan <saravanak@...gle.com>, Jingoo Han <jingoohan1@...il.com>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, Richard Zhu <hongxing.zhu@....com>, 
	Lucas Stach <l.stach@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev, 
	Niklas Cassel <cassel@...nel.org>
Subject: Re: [PATCH v11 10/11] PCI: dwc: Print warning message when
 cpu_addr_fixup() exists

On Thu, Jun 12, 2025 at 11:51:56AM -0400, Frank Li wrote:
> On Thu, Jun 12, 2025 at 08:16:03PM +0530, Manivannan Sadhasivam wrote:
> > On Thu, Mar 13, 2025 at 11:38:46AM -0400, Frank Li wrote:
> > > If the parent 'ranges' property in DT correctly describes the address
> > > translation, the cpu_addr_fixup() callback is not needed. Print a warning
> > > message to inform users to correct their DTB files and prepare to remove
> > > cpu_addr_fixup().
> > >
> >
> > This patch seem to have dropped, but I do see a value in printing the warning to
> > encourage developers/users to fix the DTB in some way. Since we fixed the driver
> > to parse the DT 'ranges' properly, the presence of cpu_addr_fixup() callback
> > indicates that the translation is not properly described in DT. So DT has to be
> > fixed.
> 
> This patch already in mainline with Bjorn's fine tuned at when merge.
> 
> 	fixup = pci->ops ? pci->ops->cpu_addr_fixup : NULL;
>         if (fixup) {
>                 fixup_addr = fixup(pci, cpu_phys_addr);
>                 if (reg_addr == fixup_addr) {
>                         dev_info(dev, "%s reg[%d] %#010llx == %#010llx == fixup(cpu %#010llx); %ps is redundant with this devicetree\n",
>                                  reg_name, index, reg_addr, fixup_addr,
>                                  (unsigned long long) cpu_phys_addr, fixup);
>                 } else {
>                         dev_warn(dev, "%s reg[%d] %#010llx != %#010llx == fixup(cpu %#010llx); devicetree is broken\n",
>                                  reg_name, index, reg_addr, fixup_addr,
>                                  (unsigned long long) cpu_phys_addr);
>                         reg_addr = fixup_addr;
>                 }
> 
>                 return cpu_phys_addr - reg_addr;
>         }
> 
> I have not seen this "dev_warn(pci->dev, "cpu_addr_fixup() usage detected. Please fix your DTB!\n");"
> 

This patch is supposed to add this warning and nothing else.

- Mani

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