From 54fa97eeb9e22b47d68b67ee00987afa7fbc2178 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 2 Oct 2015 14:43:06 +0100 Subject: PCI/MSI: Allow the MSI domain to be device-specific So far, we've always considered that for a given PCI device, its MSI controller was either set by the architecture-specific pcibios hook, or simply inherited from the host bridge. This doesn't cover things like firmware-defined topologies like msi-map (DT) or IORT (ACPI), which can provide information about which MSI controller to use on a per-device basis. This patch adds the necessary hook into the MSI code to allow this feature, and provides the msi-map functionnality as a first implementation. Acked-by: Rob Herring Acked-by: Bjorn Helgaas Signed-off-by: Marc Zyngier --- drivers/pci/probe.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/pci/probe.c') diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 7c333f8c2327..f14a970b61fa 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1639,6 +1639,14 @@ static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev) if (d) return d; + /* + * Let's see if we have a firmware interface able to provide + * the domain. + */ + d = pci_msi_get_device_domain(dev); + if (d) + return d; + return NULL; } -- cgit v1.2.3-70-g09d2