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_data; 14 struct msi_desc; 15 extern void mask_msi_irq(struct irq_data *data); 16 extern void unmask_msi_irq(struct irq_data *data); 17 extern void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg); 18 extern void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg); 19 extern void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg); 20 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg); 21 extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); 22 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg); 23 24 struct msi_desc { 25 struct { 26 __u8 is_msix : 1; 27 __u8 multiple: 3; /* log2 number of messages */ 28 __u8 maskbit : 1; /* mask-pending bit supported ? */ 29 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 30 __u8 pos; /* Location of the msi capability */ 31 __u16 entry_nr; /* specific enabled entry */ 32 unsigned default_irq; /* default pre-assigned irq */ 33 } msi_attrib; 34 35 u32 masked; /* mask bits */ 36 unsigned int irq; 37 struct list_head list; 38 39 union { 40 void __iomem *mask_base; 41 u8 mask_pos; 42 }; 43 struct pci_dev *dev; 44 45 /* Last set MSI message */ 46 struct msi_msg msg; 47 }; 48 49 /* 50 * The arch hook for setup up msi irqs 51 */ 52 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); 53 void arch_teardown_msi_irq(unsigned int irq); 54 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 55 extern void arch_teardown_msi_irqs(struct pci_dev *dev); 56 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); 57 58 59 #endif /* LINUX_MSI_H */ 60