cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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msi.c (989B)

      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}