linux-kernel - Re: [PATCH v11 04/10] PCI: OF: Fix the conversion of IO ranges into IO resources.

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Date:	Mon, 22 Sep 2014 12:18:42 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh+dt@...nel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-pci <linux-pci@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH v11 04/10] PCI: OF: Fix the conversion of IO ranges into
 IO resources.

On Mon, Sep 22, 2014 at 10:32 AM, Liviu Dudau <Liviu.Dudau@....com> wrote:
> On Sat, Sep 20, 2014 at 06:33:11PM +0100, Rob Herring wrote:
>> On 09/17/2014 08:30 PM, Liviu Dudau wrote:
>> > The ranges property for a host bridge controller in DT describes
>> > the mapping between the PCI bus address and the CPU physical address.
>> > The resources framework however expects that the IO resources start
>> > at a pseudo "port" address 0 (zero) and have a maximum size of IO_SPACE_LIMIT.
>> > The conversion from pci ranges to resources failed to take that into account.

[...]

>> >               if ((range.flags & IORESOURCE_MEM) &&
>> >                       (range.flags & IORESOURCE_PREFETCH)) {
>> >                       pre_mem_pci = range.pci_addr;
>> >                       pre_mem_pci_sz = range.size;
>> > -                     of_pci_range_to_resource(&range, np, &pre_mem);
>> > +                     ret = of_pci_range_to_resource(&range, np, &pre_mem);
>> >                       pre_mem.name = "PCIv3 prefetched mem";
>> >               }
>> > -     }
>> >
>> > -     if (!conf_mem.start || !io_mem.start ||
>> > -         !non_mem.start || !pre_mem.start) {
>> > -             dev_err(&pdev->dev, "missing ranges in device node\n");
>> > -             return -EINVAL;
>> > +             if (ret < 0) {
>> > +                     dev_err(&pdev->dev, "missing ranges in device node\n");
>> > +                     return -EINVAL;
>>
>> You should return ret rather than potentially changing the return value.
>
> I was trying to keep the existing behaviour, which was to return -EINVAL if the
> parsing has failed. But I can return ret and propagate the original error code.

A valid concern, but I checked and I believe the return from
of_pci_range_to_resource is currently -EINVAL.

>> > +int of_pci_range_to_resource(struct of_pci_range *range,
>> > +     struct device_node *np, struct resource *res)
>> > +{
>> > +     int err;
>> > +     res->flags = range->flags;
>> > +     res->parent = res->child = res->sibling = NULL;
>> > +     res->name = np->full_name;
>> > +
>> > +     if (res->flags & IORESOURCE_IO) {
>> > +             unsigned long port = -1;
>>
>> Assigning a signed value to unsigned...
>
> Ooops, sorry about that. Removed the initialisation now.
>
>>
>> Does port need to be 64-bit on 64-bit hosts?
>
> I'm following existing APIs. Basically my function is a variant of __of_address_to_resource()

Okay.

Rob
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