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 get_cached_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg); 18 extern void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg); 19 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg); 20 extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); 21 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg); 22 23 struct msi_desc { 24 struct { 25 __u8 is_msix : 1; 26 __u8 multiple: 3; /* log2 number of messages */ 27 __u8 maskbit : 1; /* mask-pending bit supported ? */ 28 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 29 __u8 pos; /* Location of the msi capability */ 30 __u16 entry_nr; /* specific enabled entry */ 31 unsigned default_irq; /* default pre-assigned irq */ 32 } msi_attrib; 33 34 u32 masked; /* mask bits */ 35 unsigned int irq; 36 struct list_head list; 37 38 union { 39 void __iomem *mask_base; 40 u8 mask_pos; 41 }; 42 struct pci_dev *dev; 43 44 /* Last set MSI message */ 45 struct msi_msg msg; 46 }; 47 48 /* 49 * The arch hook for setup up msi irqs 50 */ 51 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); 52 void arch_teardown_msi_irq(unsigned int irq); 53 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 54 extern void arch_teardown_msi_irqs(struct pci_dev *dev); 55 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); 56 57 58 #endif /* LINUX_MSI_H */ 59