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authorMarc Zyngier <marc.zyngier@arm.com>2015-10-02 10:19:32 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2015-10-16 13:07:16 +0100
commit098259eb16675a83e1d6ea31e06dc3ec152810a2 (patch)
treee364a4ce4b5ed53a6851cac807e2427fa6ae8e45 /drivers/pci/probe.c
parent82b9b4243c6d99d9e38087fa89183aa7479185e9 (diff)
downloadlinux-098259eb16675a83e1d6ea31e06dc3ec152810a2.tar.bz2
PCI: Add per-device MSI domain hook
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>
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8361d27e5eca..7c333f8c2327 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)