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 | |