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 /* Heper 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
  15 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  16
  17 struct msi_desc {
  18         struct {
  19                 __u8    type    : 5;    /* {0: unused, 5h:MSI, 11h:MSI-X} */
  20                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  21                 __u8    unused  : 1;
  22                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  23                 __u8    pos;            /* Location of the msi capability */
  24                 __u16   entry_nr;       /* specific enabled entry         */
  25                 unsigned default_irq;   /* default pre-assigned irq       */
  26         }msi_attrib;
  27
  28         struct {
  29                 __u16   head;
  30                 __u16   tail;
  31         }link;
  32
  33         void __iomem *mask_base;
  34         struct pci_dev *dev;
  35
  36 #ifdef CONFIG_PM
  37         /* PM save area for MSIX address/data */
  38         struct msi_msg msg_save;
  39 #endif
  40 };
  41
  42 /*
  43  * The arch hook for setup up msi irqs
  44  */
  45 int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev);
  46 void arch_teardown_msi_irq(unsigned int irq);
  47
  48
  49 #endif /* LINUX_MSI_H */