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
 };
 
 /*