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 num of messages allocated */ 29 __u8 multi_cap : 3; /* log2 num of messages supported */ 30 __u8 maskbit : 1; /* mask-pending bit supported ? */ 31 __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ 32 __u8 pos; /* Location of the msi capability */ 33 __u16 entry_nr; /* specific enabled entry */ 34 unsigned default_irq; /* default pre-assigned irq */ 35 } msi_attrib; 36 37 u32 masked; /* mask bits */ 38 unsigned int irq; 39 unsigned int nvec_used; /* number of messages */ 40 struct list_head list; 41 42 union { 43 void __iomem *mask_base; 44 u8 mask_pos; 45 }; 46 struct pci_dev *dev; 47 48 /* Last set MSI message */ 49 struct msi_msg msg; 50 51 struct kobject kobj; 52 }; 53 54 /* 55 * The arch hooks to setup up msi irqs. Those functions are 56 * implemented as weak symbols so that they /can/ be overriden by 57 * architecture specific code if needed. 58 */ 59 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); 60 void arch_teardown_msi_irq(unsigned int irq); 61 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); 62 void arch_teardown_msi_irqs(struct pci_dev *dev); 63 int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); 64 void arch_restore_msi_irqs(struct pci_dev *dev); 65 66 void default_teardown_msi_irqs(struct pci_dev *dev); 67 void default_restore_msi_irqs(struct pci_dev *dev); 68 u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag); 69 u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag); 70 71 struct msi_chip { 72 struct module *owner; 73 struct device *dev; 74 struct device_node *of_node; 75 struct list_head list; 76 77 int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev, 78 struct msi_desc *desc); 79 void (*teardown_irq)(struct msi_chip *chip, unsigned int irq); 80 int (*check_device)(struct msi_chip *chip, struct pci_dev *dev, 81 int nvec, int type); 82 }; 83 84 #endif /* LINUX_MSI_H */ 85