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 struct irq_desc;
  14 extern void mask_msi_irq(unsigned int irq);
  15 extern void unmask_msi_irq(unsigned int irq);
  16 extern void read_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
  17 extern void get_cached_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
  18 extern void write_msi_msg_desc(struct irq_desc *desc, struct msi_msg *msg);
  19 extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
  20 extern void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
  21 extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
  22
  23 struct msi_desc {
  24         struct {
  25                 __u8    is_msix : 1;
  26                 __u8    multiple: 3;    /* log2 number of messages */
  27                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
  28                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
  29                 __u8    pos;            /* Location of the msi capability */
  30                 __u16   entry_nr;       /* specific enabled entry         */
  31                 unsigned default_irq;   /* default pre-assigned irq       */
  32         } msi_attrib;
  33
  34         u32 masked;                     /* mask bits */
  35         unsigned int irq;
  36         struct list_head list;
  37
  38         union {
  39                 void __iomem *mask_base;
  40                 u8 mask_pos;
  41         };
  42         struct pci_dev *dev;
  43
  44         /* Last set MSI message */
  45         struct msi_msg msg;
  46 };
  47
  48 /*
  49  * The arch hook for setup up msi irqs
  50  */
  51 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
  52 void arch_teardown_msi_irq(unsigned int irq);
  53 extern int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
  54 extern void arch_teardown_msi_irqs(struct pci_dev *dev);
  55 extern int arch_msi_check_device(struct pci_dev* dev, int nvec, int type);
  56
  57
  58 #endif /* LINUX_MSI_H */