arch/x86/include/asm/irq_remapping.h

   1 #ifndef _ASM_X86_IRQ_REMAPPING_H
   2 #define _ASM_X86_IRQ_REMAPPING_H
   3
   4 #define IRTE_DEST(dest) ((x2apic_mode) ? dest : dest << 8)
   5
   6 #ifdef CONFIG_INTR_REMAP
   7 static inline void prepare_irte(struct irte *irte, int vector,
   8                                 unsigned int dest)
   9 {
  10         memset(irte, 0, sizeof(*irte));
  11
  12         irte->present = 1;
  13         irte->dst_mode = apic->irq_dest_mode;
  14         /*
  15          * Trigger mode in the IRTE will always be edge, and for IO-APIC, the
  16          * actual level or edge trigger will be setup in the IO-APIC
  17          * RTE. This will help simplify level triggered irq migration.
  18          * For more details, see the comments (in io_apic.c) explainig IO-APIC
  19          * irq migration in the presence of interrupt-remapping.
  20         */
  21         irte->trigger_mode = 0;
  22         irte->dlvry_mode = apic->irq_delivery_mode;
  23         irte->vector = vector;
  24         irte->dest_id = IRTE_DEST(dest);
  25         irte->redir_hint = 1;
  26 }
  27 static inline bool irq_remapped(struct irq_cfg *cfg)
  28 {
  29         return cfg->irq_2_iommu.iommu != NULL;
  30 }
  31 #else
  32 static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
  33 {
  34 }
  35 static inline bool irq_remapped(struct irq_cfg *cfg)
  36 {
  37         return false;
  38 }
  39 #endif
  40
  41 #endif  /* _ASM_X86_IRQ_REMAPPING_H */