1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2006-2007, Michael Ellerman, IBM Corporation. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/msi.h> 8 #include <linux/pci.h> 9 10 #include <asm/machdep.h> 11 12 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) 13 { 14 struct pci_controller *phb = pci_bus_to_host(dev->bus); 15 16 if (!phb->controller_ops.setup_msi_irqs || 17 !phb->controller_ops.teardown_msi_irqs) { 18 pr_debug("msi: Platform doesn't provide MSI callbacks.\n"); 19 return -ENOSYS; 20 } 21 22 /* PowerPC doesn't support multiple MSI yet */ 23 if (type == PCI_CAP_ID_MSI && nvec > 1) 24 return 1; 25 26 return phb->controller_ops.setup_msi_irqs(dev, nvec, type); 27 } 28 29 void arch_teardown_msi_irqs(struct pci_dev *dev) 30 { 31 struct pci_controller *phb = pci_bus_to_host(dev->bus); 32 33 /* 34 * We can be called even when arch_setup_msi_irqs() returns -ENOSYS, 35 * so check the pointer again. 36 */ 37 if (phb->controller_ops.teardown_msi_irqs) 38 phb->controller_ops.teardown_msi_irqs(dev); 39 } 40