LXR linux/arch/powerpc/kernel/msi.c

   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
  12int 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
  29void 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