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msi.h
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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 extern void mask_msi_irq(struct irq_data *data);
17 extern void unmask_msi_irq(struct irq_data *data);
18 extern void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
19 extern void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
20 extern void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
21 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
22 extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
23 extern 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  struct list_head list;
39 
40  union {
41  void __iomem *mask_base;
42  u8 mask_pos;
43  };
44  struct pci_dev *dev;
45 
46  /* Last set MSI message */
47  struct msi_msg msg;
48 
49  struct kobject kobj;
50 };
51 
52 /*
53  * The arch hook for setup up msi irqs
54  */
55 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
56 void arch_teardown_msi_irq(unsigned int irq);
57 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
58 extern void arch_teardown_msi_irqs(struct pci_dev *dev);
59 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
60 
61 
62 #endif /* LINUX_MSI_H */
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