Re: [Xen-devel] [v2][PATCH 2/8] pci: provide a way to reserve some specific devfn

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, May 16, 2014 at 06:53:38PM +0800, Tiejun Chen wrote:
> Sometime we may need to reserve some specific devfn since
> some vgabios or drivers have to work well with a fixed bdf.
> 
> Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> ---
> v2:
> 
> * New patch
> 
>  hw/pci/pci.c         | 11 +++++++++++
>  include/hw/pci/pci.h |  1 +
>  2 files changed, 12 insertions(+)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index ef944cf..06b0c92 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -813,6 +813,17 @@ static void do_pci_unregister_device(PCIDevice *pci_dev)
>      memory_region_destroy(&pci_dev->bus_master_enable_region);
>  }
>  
> +
> +void pci_reserve_pci_devfn(PCIBus *bus, uint8_t devfn)
> +{
> +    int ret = test_and_set_bit(devfn, bus->pci_bdf_bitmap);

unsigned int please.
> +    if (ret) {
> +        error_report("PCI: %02x:%02x:%02x is not available to reserve.",
> +                    pci_bus_num(bus), PCI_SLOT(devfn), PCI_FUNC(devfn));
> +        return;
> +    }
> +}

Don't we want to return whether we are failed or not?

> +
>  /* -1 for devfn means auto assign */
>  static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
>                                           const char *name, int devfn)
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index 8c25ae5..cbb174e 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -342,6 +342,7 @@ void pci_bus_new_inplace(PCIBus *bus, size_t bus_size, 
> DeviceState *parent,
>                           MemoryRegion *address_space_mem,
>                           MemoryRegion *address_space_io,
>                           uint8_t devfn_min, const char *typename);
> +void pci_reserve_pci_devfn(PCIBus *bus, uint8_t devfn);
>  PCIBus *pci_bus_new(DeviceState *parent, const char *name,
>                      MemoryRegion *address_space_mem,
>                      MemoryRegion *address_space_io,
> -- 
> 1.9.1
> 
> 
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