root/include/linux/msi.h

INCLUDED FROM

#ifndef LINUX_MSI_H
#define LINUX_MSI_H

#include <linux/list.h>

struct msi_msg {
        u32     address_lo;     /* low 32 bits of msi message address */
        u32     address_hi;     /* high 32 bits of msi message address */
        u32     data;           /* 16 bits of msi message data */
};

/* Helper functions */
extern void mask_msi_irq(unsigned int irq);
extern void unmask_msi_irq(unsigned int irq);
extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);

struct msi_desc {
        struct {
                __u8    type    : 5;    /* {0: unused, 5h:MSI, 11h:MSI-X} */
                __u8    maskbit : 1;    /* mask-pending bit supported ?   */
                __u8    masked  : 1;
                __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
                __u8    pos;            /* Location of the msi capability */
                __u32   maskbits_mask;  /* mask bits mask */
                __u16   entry_nr;       /* specific enabled entry         */
                unsigned default_irq;   /* default pre-assigned irq       */
        }msi_attrib;

        unsigned int irq;
        struct list_head list;

        void __iomem *mask_base;
        struct pci_dev *dev;

        /* Last set MSI message */
        struct msi_msg msg;
};

/*
 * The arch hook for setup up msi irqs
 */
int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
void arch_teardown_msi_irq(unsigned int irq);
extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
extern void arch_teardown_msi_irqs(struct pci_dev *dev);
extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);


#endif /* LINUX_MSI_H */