linux-kernel - Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

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Date:	Mon, 29 Sep 2014 16:36:30 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	suravee.suthikulpanit@....com
Cc:	will.deacon@....com, liviu.dudau@....com, marc.zyngier@....com,
	mark.rutland@....com, catalin.marinas@....com,
	jason@...edaemon.net, tglx@...utronix.de, robh+dt@...nel.org,
	bhelgaas@...gle.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: Re: [RFC 2/4] PCI: generic: Add support for ARM64 and MSI(x)

On Sunday 28 September 2014 15:53:28 suravee.suthikulpanit@....com wrote:
> +
> +#ifdef CONFIG_ARM64
> +struct pci_bus *gen_scan_root_bus(struct device *parent, int bus,
> +                                      struct pci_ops *ops, void *sysdata,
> +                                      struct list_head *resources)
> +{

I don't see anything ARM64 specific in this, the function only uses
the newly added generic helpers.

>  static int gen_pci_probe(struct platform_device *pdev)
>  {
> @@ -326,6 +385,7 @@ static int gen_pci_probe(struct platform_device *pdev)
>         struct device *dev = &pdev->dev;
>         struct device_node *np = dev->of_node;
>         struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
> +#ifndef CONFIG_ARM64
>         struct hw_pci hw = {
>                 .nr_controllers = 1,
>                 .private_data   = (void **)&pci,
> @@ -333,6 +393,7 @@ static int gen_pci_probe(struct platform_device *pdev)
>                 .map_irq        = of_irq_parse_and_map_pci,
>                 .ops            = &gen_pci_ops,
>         };
> +#endif
>  

Same here, I'd suggest marking this "#ifdef CONFIG_ARM" instead, as hw_pci
is an arm32 specific data structure.

>         if (!pci)
>                 return -ENOMEM;
> @@ -368,8 +429,24 @@ static int gen_pci_probe(struct platform_device *pdev)
>                 gen_pci_release_of_pci_ranges(pci);
>                 return err;
>         }
> +#ifdef CONFIG_ARM64
>  
> +#ifdef CONFIG_PCI_MSI
> +       pci->msi_parent = of_parse_phandle(np, "msi-parent", 0);
> +       if (!pci->msi_parent) {
> +               dev_err(&pdev->dev, "Failed to allocate msi-parent.\n");
> +               return -EINVAL;
> +       }
> +#endif

We probably want to enable MSI unconditionally on ARM64, so the #ifdef is
not necessary here. However, I don't think that a missing msi-parent should
be a fatal error here: we can still continue without MSI support if this
case.

> +       if (!gen_scan_root_bus(&pdev->dev, pci->cfg.bus_range.start,
> +                              &gen_pci_ops, pci, &pci->resources)) {
> +               dev_err(&pdev->dev, "failed to enable PCIe ports\n");
> +               return -ENODEV;
> +       }
> +#else
>         pci_common_init_dev(dev, &hw);
> +#endif /* CONFIG_ARM64 */
> 

Again, just make the pci_common_init_dev() call #ifdef CONFIG_ARM, and move
the generic case after it, outside of the #ifdef.

	Arnd
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