On Tue, Oct 06, 2015 at 06:04:02PM +0100, Marc Zyngier wrote:
> So far, we have considered that the MSI domain for a device was
> either set via the architecture-dependent pcibios implementation
> or inherited from the host bridge.
>
> As we're about to break that assumption, add pci_dev_msi_domain
> which is the equivalent of pci_host_bridge_msi_domain, but for
> a single device.
>
> Other than moving things around a bit, this patch on its own
> has no effect.
>
> Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
Acked-by: Bjorn Helgaas <bhelg...@google.com>
> ---
> drivers/pci/probe.c | 35 ++++++++++++++++++++++++++++++-----
> 1 file changed, 30 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 8361d27..7c333f8 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1622,15 +1622,40 @@ static void pci_init_capabilities(struct pci_dev *dev)
> pci_enable_acs(dev);
> }
>
> +/*
> + * This is the equivalent of pci_host_bridge_msi_domain that acts on
> + * devices. Firmware interfaces that can select the MSI domain on a
> + * per-device basis should be called from here.
> + */
> +static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev)
> +{
> + struct irq_domain *d;
> +
> + /*
> + * If a domain has been set through the pcibios_add_device
> + * callback, then this is the one (platform code knows best).
> + */
> + d = dev_get_msi_domain(&dev->dev);
> + if (d)
> + return d;
> +
> + return NULL;
> +}
> +
> static void pci_set_msi_domain(struct pci_dev *dev)
> {
> + struct irq_domain *d;
> +
> /*
> - * If no domain has been set through the pcibios_add_device
> - * callback, inherit the default from the bus device.
> + * If the platform or firmware interfaces cannot supply a
> + * device-specific MSI domain, then inherit the default domain
> + * from the host bridge itself.
> */
> - if (!dev_get_msi_domain(&dev->dev))
> - dev_set_msi_domain(&dev->dev,
> - dev_get_msi_domain(&dev->bus->dev));
> + d = pci_dev_msi_domain(dev);
> + if (!d)
> + d = dev_get_msi_domain(&dev->bus->dev);
> +
> + dev_set_msi_domain(&dev->dev, d);
> }
>
> void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
> --
> 2.1.4
>
> --
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