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
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