1 #ifndef LINUX_MSI_H 2 #define LINUX_MSI_H 3 4 struct msi_msg { 5 u32 address_lo; /* low 32 bits of msi message address */ 6 u32 address_hi; /* high 32 bits of msi message address */ 7 u32 data; /* 16 bits of msi message data */ 8 }; 9 10 /* Helper functions */ 11 extern void mask_msi_irq(unsigned int irq); 12 extern void unmask_msi_irq(unsigned int irq); 13 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg); 14 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg); 15 16 struct msi_desc { 17 struct { 18 __u8 type : 5; /* {0: unused, 5h:MSI, 11h:MSI-X} */ 19 __u8 maskbit : 1; /* mask-pending bit supported ? */ 20 __u8 masked : 1; 21 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 22 __u8 pos; /* Location of the msi capability */ 23 __u16 entry_nr; /* specific enabled entry */ 24 unsigned default_irq; /* default pre-assigned irq */ 25 }msi_attrib; 26 27 struct { 28 __u16 head; 29 __u16 tail; 30 }link; 31 32 void __iomem *mask_base; 33 struct pci_dev *dev; 34 35 /* Last set MSI message */ 36 struct msi_msg msg; 37 }; 38 39 /* 40 * The arch hook for setup up msi irqs 41 */ 42 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); 43 void arch_teardown_msi_irq(unsigned int irq); 44 45 46 #endif /* LINUX_MSI_H */ 47