linux/include/linux/msi.h
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   1#ifndef LINUX_MSI_H
   2#define LINUX_MSI_H
   3
   4#include <linux/kobject.h>
   5#include <linux/list.h>
   6
   7struct msi_msg {
   8        u32     address_lo;     /* low 32 bits of msi message address */
   9        u32     address_hi;     /* high 32 bits of msi message address */
  10        u32     data;           /* 16 bits of msi message data */
  11};
  12
  13/* Helper functions */
  14struct irq_data;
  15struct msi_desc;
  16extern void mask_msi_irq(struct irq_data *data);
  17extern void unmask_msi_irq(struct irq_data *data);
  18extern void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  19extern void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  20extern void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
  21extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
  22extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  23extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  24
  25struct msi_desc {
  26        struct {
  27                __u8    is_msix : 1;
  28                __u8    multiple: 3;    /* log2 number of messages */
  29                __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  30                __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  31                __u8    pos;            /* Location of the msi capability */
  32                __u16   entry_nr;       /* specific enabled entry         */
  33                unsigned default_irq;   /* default pre-assigned irq       */
  34        } msi_attrib;
  35
  36        u32 masked;                     /* mask bits */
  37        unsigned int irq;
  38        struct list_head list;
  39
  40        union {
  41                void __iomem *mask_base;
  42                u8 mask_pos;
  43        };
  44        struct pci_dev *dev;
  45
  46        /* Last set MSI message */
  47        struct msi_msg msg;
  48
  49        struct kobject kobj;
  50};
  51
  52/*
  53 * The arch hook for setup up msi irqs
  54 */
  55int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  56void arch_teardown_msi_irq(unsigned int irq);
  57extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
  58extern void arch_teardown_msi_irqs(struct pci_dev *dev);
  59extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
  60
  61
  62#endif /* LINUX_MSI_H */
  63
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