root/include/linux/msi.h

INCLUDED FROM

#ifndef LINUX_MSI_H
#define LINUX_MSI_H

#include <linux/kobject.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 */
struct irq_data;
struct msi_desc;
void mask_msi_irq(struct irq_data *data);
void unmask_msi_irq(struct irq_data *data);
void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void read_msi_msg(unsigned int irq, struct msi_msg *msg);
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
void write_msi_msg(unsigned int irq, struct msi_msg *msg);

struct msi_desc {
        struct {
                __u8    is_msix : 1;
                __u8    multiple: 3;    /* log2 num of messages allocated */
                __u8    multi_cap : 3;  /* log2 num of messages supported */
                __u8    maskbit : 1;    /* mask-pending bit supported ? */
                __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit */
                __u16   entry_nr;       /* specific enabled entry */
                unsigned default_irq;   /* default pre-assigned irq */
        } msi_attrib;

        u32 masked;                     /* mask bits */
        unsigned int irq;
        unsigned int nvec_used;         /* number of messages */
        struct list_head list;

        union {
                void __iomem *mask_base;
                u8 mask_pos;
        };
        struct pci_dev *dev;

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

/*
 * The arch hooks to setup up msi irqs. Those functions are
 * implemented as weak symbols so that they /can/ be overriden by
 * architecture specific code if needed.
 */
int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
void arch_teardown_msi_irq(unsigned int irq);
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
void arch_teardown_msi_irqs(struct pci_dev *dev);
void arch_restore_msi_irqs(struct pci_dev *dev);

void default_teardown_msi_irqs(struct pci_dev *dev);
void default_restore_msi_irqs(struct pci_dev *dev);
u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag);

struct msi_chip {
        struct module *owner;
        struct device *dev;
        struct device_node *of_node;
        struct list_head list;

        int (*setup_irq)(struct msi_chip *chip, struct pci_dev *dev,
                         struct msi_desc *desc);
        void (*teardown_irq)(struct msi_chip *chip, unsigned int irq);
};

#endif /* LINUX_MSI_H */