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1// SPDX-License-Identifier: GPL-2.02/*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}44