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