[RFC/RFT PATCH 2/2] ARM64: kernel: pci: implement PCI device resources claiming

[Bjorn Helgaas]

Hi Lorenzo,

On Thu, May 14, 2015 at 03:42:16PM +0100, Lorenzo Pieralisi wrote:
> When a device is scanned and added to the PCI bus, its resources
> should be claimed to validate the BARs configuration and to assign
> them a parent resource so that the resource hierarchy can be sanity
> checked.
> 
> This patch adds code that carries out PCI device resources claiming to
> the ARM64 pcibios_add_device implementation so that device resources
> are claimed by the core PCI layer upon PCI device initialization on
> ARM64 systems.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> Cc: Arnd Bergmann <arnd at arndb.de>
> Cc: Will Deacon <will.deacon at arm.com>
> Cc: Liviu Dudau <liviu.dudau at arm.com>
> Cc: Bjorn Helgaas <bhelgaas at google.com>

Seems like Suravee proposed a tweak?  Can you post a v2 with that
incorporated if necessary?

Bjorn

> ---
>  arch/arm64/kernel/pci.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index 4095379..c0a88ca 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -43,8 +43,18 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
>   */
>  int pcibios_add_device(struct pci_dev *dev)
>  {
> +	struct resource *res;
> +	int i;
> +
>  	dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
>  
> +	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> +		res = &dev->resource[i];
> +		if (res->parent || !res->flags)
> +			continue;
> +		pci_claim_resource(dev, i);
> +	}
> +
>  	return 0;
>  }
>  
> -- 
> 2.2.1
>