Merge tag 'x86-irq-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 PCI irq routing updates from Thomas Gleixner:

 - Cleanup and robustify the PCI interrupt routing table handling
   including proper range checks

 - Add support for Intel 82378ZB/82379AB, SiS85C497 PIRQ routers

 - Fix the ALi M1487 router handling

 - Handle the IRT routing table format in AMI BIOSes correctly

* tag 'x86-irq-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/PCI: Fix coding style in PIRQ table verification
  x86/PCI: Fix ALi M1487 (IBC) PIRQ router link value interpretation
  x86/PCI: Add $IRT PIRQ routing table support
  x86/PCI: Handle PIRQ routing tables with no router device given
  x86/PCI: Add PIRQ routing table range checks
  x86/PCI: Add support for the SiS85C497 PIRQ router
  x86/PCI: Disambiguate SiS85C503 PIRQ router code entities
  x86/PCI: Handle IRQ swizzling with PIRQ routers
  x86/PCI: Also match function number in $PIR table
  x86/PCI: Include function number in $PIR table dump
  x86/PCI: Show the physical address of the $PIR table

Author: torvalds

arch/x86/include/asm/pci_x86.h

@@ -93,6 +93,15 @@ struct irq_routing_table {
 	struct irq_info slots[];
 } __attribute__((packed));
 
+struct irt_routing_table {
+	u32 signature;			/* IRT_SIGNATURE should be here */
+	u8 size;			/* Number of entries provided */
+	u8 used;			/* Number of entries actually used */
+	u16 exclusive_irqs;		/* IRQs devoted exclusively to
+					   PCI usage */
+	struct irq_info slots[];
+} __attribute__((packed));
+
 extern unsigned int pcibios_irq_mask;
 
 extern raw_spinlock_t pci_config_lock;