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PCI: Add per-device MSI domain hook

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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.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-10-02 10:19:32 +01:00
parent 82b9b4243c
commit 098259eb16
1 changed files with 30 additions and 5 deletions
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35
drivers/pci/probe.c
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@ -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)