Commit 769b461f authored Jun 28, 2017 by Lorenzo Pieralisi Committed by Bjorn Helgaas Jul 02, 2017

arm64: PCI: Drop DT IRQ allocation from pcibios_alloc_irq()



With the introduction of struct pci_host_bridge.map_irq pointer it is
possible to assign IRQs for all devices originating from a PCI host bridge
at probe time; this is implemented through pci_assign_irq() that relies on
the struct pci_host_bridge.map_irq pointer to map IRQ for a given device.

The benefits this brings are twofold:

  - the IRQ for a device is assigned once at probe time
  - the IRQ assignment works also for hotplugged devices

With all DT based PCI host bridges converted to the struct
pci_host_bridge.{map/swizzle}_irq hooks mechanism the DT IRQ allocation in
ARM64 pcibios_alloc_irq() is now redundant and can be removed.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>

parent 1ee4d93d

arch/arm64/kernel/pci.c

+4 −6

Original line number	Diff line number	Diff line
		@@ -39,20 +39,18 @@ resource_size_t pcibios_align_resource(void data, const struct resource res,
		return res->start;
		}

		#ifdef CONFIG_ACPI
		/*
		* Try to assign the IRQ number when probing a new device
		*/
		int pcibios_alloc_irq(struct pci_dev *dev)
		{
		if (acpi_disabled)
		dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
		#ifdef CONFIG_ACPI
		else
		return acpi_pci_irq_enable(dev);
		#endif
		if (!acpi_disabled)
		acpi_pci_irq_enable(dev);

		return 0;
		}
		#endif

		/*
		* raw_pci_read/write - Platform-specific PCI config space access.

Admin message