1 #ifndef LINUX_MSI_H 2 #define LINUX_MSI_H 3 4 #include <linux/kobject.h> 5 #include <linux/list.h> 6 7 struct msi_msg { 8 u32 address_lo; /* low 32 bits of msi message address */ 9 u32 address_hi; /* high 32 bits of msi message address */ 10 u32 data; /* 16 bits of msi message data */ 11 }; 12 13 /* Helper functions */ 14 struct irq_data; 15 struct msi_desc; 16 void mask_msi_irq(struct irq_data *data); 17 void unmask_msi_irq(struct irq_data *data); 18 void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg); 19 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg); 20 void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg); 21 void read_msi_msg(unsigned int irq, struct msi_msg *msg); 22 void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); 23 void write_msi_msg(unsigned int irq, struct msi_msg *msg); 24 25 struct msi_desc { 26 struct { 27 __u8 is_msix : 1; 28 __u8 multiple: 3; /* log2 number of messages */ 29 __u8 maskbit : 1; /* mask-pending bit supported ? */ 30 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 31 __u8 pos; /* Location of the msi capability */ 32 __u16 entry_nr; /* specific enabled entry */ 33 unsigned default_irq; /* default pre-assigned irq */ 34 } msi_attrib; 35 36 u32 masked; /* mask bits */ 37 unsigned int irq; 38 unsigned int nvec_used; /* number of messages */ 39 struct list_head list; 40 41 union { 42 void __iomem *mask_base; 43 u8 mask_pos; 44 }; 45 struct pci_dev *dev; 46 47 /* Last set MSI message */ 48 struct msi_msg msg; 49 50 struct kobject kobj; 51 }; 52 53 /* 54 * The arch hooks to setup up msi irqs. Those functions are 55 * implemented as weak symbols so that they /can/ be overriden by 56 * architecture specific code if needed. 57 */ 58 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); 59 void arch_teardown_msi_irq(unsigned int irq); 60 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 61 void arch_teardown_msi_irqs(struct pci_dev *dev); 62 int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); 63 void arch_restore_msi_irqs(struct pci_dev *dev); 64 65 void default_teardown_msi_irqs(struct pci_dev *dev); 66 void default_restore_msi_irqs(struct pci_dev *dev); 67 u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag); 68 u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag); 69 70 struct msi_chip { 71 struct module *owner; 72 struct device *dev; 73 struct device_node *of_node; 74 struct list_head list; 75 76 int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev, 77 struct msi_desc *desc); 78 void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); 79 int (*check_device)(struct msi_chip *chip, struct pci_dev *dev, 80 int nvec, int type); 81 }; 82 83 #endif /* LINUX_MSI_H */ 84