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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pcidev_msi.c (1052B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * MSI[X} related functions which are available unconditionally.
      4 */
      5#include "../pci.h"
      6
      7/*
      8 * Disable the MSI[X] hardware to avoid screaming interrupts during boot.
      9 * This is the power on reset default so usually this should be a noop.
     10 */
     11
     12void pci_msi_init(struct pci_dev *dev)
     13{
     14	u16 ctrl;
     15
     16	dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
     17	if (!dev->msi_cap)
     18		return;
     19
     20	pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
     21	if (ctrl & PCI_MSI_FLAGS_ENABLE) {
     22		pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS,
     23				      ctrl & ~PCI_MSI_FLAGS_ENABLE);
     24	}
     25
     26	if (!(ctrl & PCI_MSI_FLAGS_64BIT))
     27		dev->no_64bit_msi = 1;
     28}
     29
     30void pci_msix_init(struct pci_dev *dev)
     31{
     32	u16 ctrl;
     33
     34	dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
     35	if (!dev->msix_cap)
     36		return;
     37
     38	pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
     39	if (ctrl & PCI_MSIX_FLAGS_ENABLE) {
     40		pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS,
     41				      ctrl & ~PCI_MSIX_FLAGS_ENABLE);
     42	}
     43}