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                 __u16   entry_nr;       /* specific enabled entry         */
  26                 unsigned default_irq;   /* default pre-assigned irq       */
  27         }msi_attrib;
  28
  29         unsigned int irq;
  30         struct list_head list;
  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 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
  45 extern void arch_teardown_msi_irqs(struct pci_dev *dev);
  46 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
  47
  48
  49 #endif /* LINUX_MSI_H */