| // 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); |
| } |
| } |
