[PATCHv5 08/11] ARM: pci: add ->add_bus() and ->remove_bus() hooks to hw_pci

[Thierry Reding]

On Mon, Jul 15, 2013 at 01:52:44PM +0200, Thomas Petazzoni wrote:
> Some PCI drivers may need to adjust the pci_bus structure after it has
> been allocated by the Linux PCI core. The PCI core allows
> architectures to implement the pcibios_add_bus() and
> pcibios_remove_bus() for this purpose. This commit therefore extends
> the hw_pci and pci_sys_data structures of the ARM PCI core to allow
> PCI drivers to register ->add_bus() and ->remove_bus() in hw_pci,
> which will get called when a bus is added or removed from the system.
> 
> This will be used for example by the Marvell PCIe driver to connect a
> particular PCI bus with its corresponding MSI chip to handle Message
> Signaled Interrupts.
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> Reviewed-by: Thierry Reding <thierry.reding at gmail.com>
> ---
>  arch/arm/include/asm/mach/pci.h |  4 ++++
>  arch/arm/kernel/bios32.c        | 16 ++++++++++++++++
>  2 files changed, 20 insertions(+)

Hi Russell,

Can we have your Acked-by on this patch so that it can be moved to a
stable branch along with some of the other patches in this branch that
both Marvell and Tegra PCIe drivers need?

Thanks,
Thierry

> 
> diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
> index a1c90d7..487155c 100644
> --- a/arch/arm/include/asm/mach/pci.h
> +++ b/arch/arm/include/asm/mach/pci.h
> @@ -36,6 +36,8 @@ struct hw_pci {
>  					  resource_size_t start,
>  					  resource_size_t size,
>  					  resource_size_t align);
> +	void            (*add_bus)(struct pci_bus *bus);
> +	void            (*remove_bus)(struct pci_bus *bus);
>  };
>  
>  /*
> @@ -63,6 +65,8 @@ struct pci_sys_data {
>  					  resource_size_t start,
>  					  resource_size_t size,
>  					  resource_size_t align);
> +	void            (*add_bus)(struct pci_bus *bus);
> +	void            (*remove_bus)(struct pci_bus *bus);
>  	void		*private_data;	/* platform controller private data	*/
>  };
>  
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index 261fcc8..530e59d 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -363,6 +363,20 @@ void pcibios_fixup_bus(struct pci_bus *bus)
>  }
>  EXPORT_SYMBOL(pcibios_fixup_bus);
>  
> +void pcibios_add_bus(struct pci_bus *bus)
> +{
> +	struct pci_sys_data *sys = bus->sysdata;
> +	if (sys->add_bus)
> +		sys->add_bus(bus);
> +}
> +
> +void pcibios_remove_bus(struct pci_bus *bus)
> +{
> +	struct pci_sys_data *sys = bus->sysdata;
> +	if (sys->remove_bus)
> +		sys->remove_bus(bus);
> +}
> +
>  /*
>   * Swizzle the device pin each time we cross a bridge.  If a platform does
>   * not provide a swizzle function, we perform the standard PCI swizzling.
> @@ -464,6 +478,8 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
>  		sys->swizzle = hw->swizzle;
>  		sys->map_irq = hw->map_irq;
>  		sys->align_resource = hw->align_resource;
> +		sys->add_bus        = hw->add_bus;
> +		sys->remove_bus     = hw->remove_bus;
>  		INIT_LIST_HEAD(&sys->resources);
>  
>  		if (hw->private_data)
> -- 
> 1.8.1.2
> 
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