Re: [PATCH v2 1/4] ARM/PCI: remove align_resource callback in pcibios_align_resource

[James Morse <james.morse@arm.com>]

On 03/06/15 09:35, Zhou Wang wrote:
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index fcbbbb1..47588dc 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -468,7 +468,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
>  		sys->busnr   = busnr;
>  		sys->swizzle = hw->swizzle;
>  		sys->map_irq = hw->map_irq;
> -		sys->align_resource = hw->align_resource;
>  		INIT_LIST_HEAD(&sys->resources);
>  
>  		if (hw->private_data)
> @@ -597,9 +596,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
>  
>  	start = (start + align - 1) & ~(align - 1);
>  
> -	if (sys->align_resource)
> -		return sys->align_resource(dev, res, start, size, align);
> -
>  	return start;
>  }

This leaves both 'sys' and 'dev' in this function as unused variables.
Please remove them too.

> diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
> index 1ab8635..155d05f 100644
> --- a/drivers/pci/host/pci-mvebu.c
> +++ b/drivers/pci/host/pci-mvebu.c
> @@ -22,6 +22,8 @@
>  #include <linux/of_pci.h>
>  #include <linux/of_platform.h>
>  
> +#include "../pci.h" /* HACK to see pci_find_host_bridge */
> +

Wouldn't it be better to promote pci_find_host_bridge to be declared in
include/linux/pci.h instead?


Thanks,

James

>  /*
>   * PCIe unit register offsets.
>   */
> @@ -751,27 +753,20 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data *sys)
>  	return 1;
>  }
>  
> -static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
> +static resource_size_t mvebu_pcie_align_resource(void *data,
> +						 const struct resource *res,
> +						 resource_size_t size,
> +						 resource_size_t align)
>  {
> -	struct mvebu_pcie *pcie = sys_to_pcie(sys);
> -	struct pci_bus *bus;
> +	struct pci_dev *dev = data;
>  
> -	bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
> -				  &mvebu_pcie_ops, sys, &sys->resources);
> -	if (!bus)
> -		return NULL;
> +	resource_size_t start = res->start;
>  
> -	pci_scan_child_bus(bus);
> +	if (res->flags & IORESOURCE_IO && start & 0x300)
> +		start = (start + 0x3ff) & ~0x3ff;
>  
> -	return bus;
> -}
> +	start = (start + align - 1) & ~(align - 1);
>  
> -static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
> -						 const struct resource *res,
> -						 resource_size_t start,
> -						 resource_size_t size,
> -						 resource_size_t align)
> -{
>  	if (dev->bus->number != 0)
>  		return start;
>  
> @@ -796,6 +791,25 @@ static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
>  		return start;
>  }
>  
> +static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
> +{
> +	struct mvebu_pcie *pcie = sys_to_pcie(sys);
> +	struct pci_host_bridge *phb;
> +	struct pci_bus *bus;
> +
> +	bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
> +				  &mvebu_pcie_ops, sys, &sys->resources);
> +	if (!bus)
> +		return NULL;
> +
> +	phb = pci_find_host_bridge(bus);
> +	phb->align_resource = mvebu_pcie_align_resource;
> +
> +	pci_scan_child_bus(bus);
> +
> +	return bus;
> +}
> +
>  static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
>  {
>  	struct hw_pci hw;
> @@ -812,7 +826,6 @@ static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
>  	hw.scan           = mvebu_pcie_scan_bus;
>  	hw.map_irq        = of_irq_parse_and_map_pci;
>  	hw.ops            = &mvebu_pcie_ops;
> -	hw.align_resource = mvebu_pcie_align_resource;
>  
>  	pci_common_init(&hw);
>  }