1 #ifndef LINUX_MSI_H 2 #define LINUX_MSI_H 3 4 #include <linux/list.h> 5 6 struct msi_msg { 7 u32 address_lo; /* low 32 bits of msi message address */ 8 u32 address_hi; /* high 32 bits of msi message address */ 9 u32 data; /* 16 bits of msi message data */ 10 }; 11 12 /* Helper functions */ 13 struct irq_desc; 14 extern void mask_msi_irq(unsigned int irq); 15 extern void unmask_msi_irq(unsigned int irq); 16 extern void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg); 17 extern void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg); 18 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg); 19 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg); 20 21 struct msi_desc { 22 struct { 23 __u8 is_msix : 1; 24 __u8 multiple: 3; /* log2 number of messages */ 25 __u8 maskbit : 1; /* mask-pending bit supported ? */ 26 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 27 __u8 pos; /* Location of the msi capability */ 28 __u16 entry_nr; /* specific enabled entry */ 29 unsigned default_irq; /* default pre-assigned irq */ 30 } msi_attrib; 31 32 u32 masked; /* mask bits */ 33 unsigned int irq; 34 struct list_head list; 35 36 union { 37 void __iomem *mask_base; 38 u8 mask_pos; 39 }; 40 struct pci_dev *dev; 41 42 /* Last set MSI message */ 43 struct msi_msg msg; 44 }; 45 46 /* 47 * The arch hook for setup up msi irqs 48 */ 49 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); 50 void arch_teardown_msi_irq(unsigned int irq); 51 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 52 extern void arch_teardown_msi_irqs(struct pci_dev *dev); 53 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); 54 55 56 #endif /* LINUX_MSI_H */ 57