1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #include <linux/pci.h> 4 #include <linux/msi.h> 5 6 #define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) 7 8 extern int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 9 extern void pci_msi_teardown_msi_irqs(struct pci_dev *dev); 10 11 #ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS 12 extern int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 13 extern void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev); 14 #else 15 static inline int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) 16 { 17 WARN_ON_ONCE(1); 18 return -ENODEV; 19 } 20 21 static inline void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev) 22 { 23 WARN_ON_ONCE(1); 24 } 25 #endif 26 27 /* 28 * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to 29 * mask all MSI interrupts by clearing the MSI enable bit does not work 30 * reliably as devices without an INTx disable bit will then generate a 31 * level IRQ which will never be cleared. 32 */ 33 static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc) 34 { 35 /* Don't shift by >= width of type */ 36 if (desc->pci.msi_attrib.multi_cap >= 5) 37 return 0xffffffff; 38 return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1; 39 } 40