// SPDX-License-Identifier: GPL-2.0 /* * MSI[X} related functions which are available unconditionally. */ #include "../pci.h" /* * Disable the MSI[X] hardware to avoid screaming interrupts during boot. * This is the power on reset default so usually this should be a noop. */ void pci_msi_init(struct pci_dev *dev) { u16 ctrl; dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); if (!dev->msi_cap) return; pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl); if (ctrl & PCI_MSI_FLAGS_ENABLE) { pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, ctrl & ~PCI_MSI_FLAGS_ENABLE); } if (!(ctrl & PCI_MSI_FLAGS_64BIT)) dev->no_64bit_msi = 1; } void pci_msix_init(struct pci_dev *dev) { u16 ctrl; dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); if (!dev->msix_cap) return; pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl); if (ctrl & PCI_MSIX_FLAGS_ENABLE) { pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl & ~PCI_MSIX_FLAGS_ENABLE); } }