include/linux/msi.h

   1 #ifndef LINUX_MSI_H
   2 #define LINUX_MSI_H
   3
   4 #include <linux/list.h>
   5
   6 struct msi_msg {
   7         u32     address_lo;     /* low 32 bits of msi message address */
   8         u32     address_hi;     /* high 32 bits of msi message address */
   9         u32     data;           /* 16 bits of msi message data */
  10 };
  11
  12 /* Helper functions */
  13 extern void mask_msi_irq(unsigned int irq);
  14 extern void unmask_msi_irq(unsigned int irq);
  15 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
  16 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  17
  18 struct msi_desc {
  19         struct {
  20                 __u8    type    : 5;    /* {0: unused, 5h:MSI, 11h:MSI-X} */
  21                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  22                 __u8    masked  : 1;
  23                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  24                 __u8    pos;            /* Location of the msi capability */
  25                 __u32   maskbits_mask;  /* mask bits mask */
  26                 __u16   entry_nr;       /* specific enabled entry         */
  27                 unsigned default_irq;   /* default pre-assigned irq       */
  28         }msi_attrib;
  29
  30         unsigned int irq;
  31         struct list_head list;
  32
  33         void __iomem *mask_base;
  34         struct pci_dev *dev;
  35
  36         /* Last set MSI message */
  37         struct msi_msg msg;
  38 };
  39
  40 /*
  41  * The arch hook for setup up msi irqs
  42  */
  43 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  44 void arch_teardown_msi_irq(unsigned int irq);
  45 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
  46 extern void arch_teardown_msi_irqs(struct pci_dev *dev);
  47 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
  48
  49
  50 #endif /* LINUX_MSI_H */