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