powerpc: Add MSI operations to pci_controller_ops struct

Add MSI setup and teardown functions to pci_controller_ops.

Patch the callsites (arch_{setup,teardown}_msi_irqs) to prefer the
controller ops version if it's available.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/pci-bridge.h

@@ -30,6 +30,12 @@ struct pci_controller_ops {
 	/* Called during PCI resource reassignment */
 	resource_size_t (*window_alignment)(struct pci_bus *, unsigned long type);
 	void		(*reset_secondary_bus)(struct pci_dev *dev);
+
+#ifdef CONFIG_PCI_MSI
+	int		(*setup_msi_irqs)(struct pci_dev *dev,
+					  int nvec, int type);
+	void		(*teardown_msi_irqs)(struct pci_dev *dev);
+#endif
 };
 
 /*

arch/powerpc/kernel/msi.c

@@ -15,7 +15,11 @@
 
 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-	if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	if ((!phb->controller_ops.setup_msi_irqs ||
+	     !phb->controller_ops.teardown_msi_irqs) &&
+	    (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs)) {
 		pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
 		return -ENOSYS;
 	}
@@ -24,10 +28,18 @@ int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	if (type == PCI_CAP_ID_MSI && nvec > 1)
 		return 1;
 
-	return ppc_md.setup_msi_irqs(dev, nvec, type);
+	if (phb->controller_ops.setup_msi_irqs)
+		return phb->controller_ops.setup_msi_irqs(dev, nvec, type);
+	else
+		return ppc_md.setup_msi_irqs(dev, nvec, type);
 }
 
 void arch_teardown_msi_irqs(struct pci_dev *dev)
 {
-	ppc_md.teardown_msi_irqs(dev);
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	if (phb->controller_ops.teardown_msi_irqs)
+		phb->controller_ops.teardown_msi_irqs(dev);
+	else
+		ppc_md.teardown_msi_irqs(dev);
 }