include/linux/msi.h

   1 #ifndef LINUX_MSI_H
   2 #define LINUX_MSI_H
   3
   4 struct msi_msg {
   5         u32     address_lo;     /* low 32 bits of msi message address */
   6         u32     address_hi;     /* high 32 bits of msi message address */
   7         u32     data;           /* 16 bits of msi message data */
   8 };
   9
  10 /* Helper functions */
  11 extern void mask_msi_irq(unsigned int irq);
  12 extern void unmask_msi_irq(unsigned int irq);
  13 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
  14 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  15
  16 struct msi_desc {
  17         struct {
  18                 __u8    type    : 5;    /* {0: unused, 5h:MSI, 11h:MSI-X} */
  19                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  20                 __u8    masked  : 1;
  21                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  22                 __u8    pos;            /* Location of the msi capability */
  23                 __u16   entry_nr;       /* specific enabled entry         */
  24                 unsigned default_irq;   /* default pre-assigned irq       */
  25         }msi_attrib;
  26
  27         struct {
  28                 __u16   head;
  29                 __u16   tail;
  30         }link;
  31
  32         void __iomem *mask_base;
  33         struct pci_dev *dev;
  34
  35         /* Last set MSI message */
  36         struct msi_msg msg;
  37 };
  38
  39 /*
  40  * The arch hook for setup up msi irqs
  41  */
  42 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  43 void arch_teardown_msi_irq(unsigned int irq);
  44
  45
  46 #endif /* LINUX_MSI_H */