Commit c5c601c4 authored Jul 07, 2017 by Marc Zyngier Committed by Thomas Gleixner Jul 07, 2017

irqdomain: Allow ACPI device nodes to be used as irqdomain identifiers



A number of irqchip implementations are (ab)using the irqdomain allocator
by passing a fwnode that is neither a FWNODE_OF or a FWNODE_IRQCHIP.

This is pretty bad, but it also feels pretty crap to force these drivers to
allocate their own irqchip_fwid when they already have a proper fwnode.

Instead, let's teach the irqdomain allocator about ACPI device nodes, and
add some lovely name generation code... Tested on an arm64 D05 system.

Reported-and-tested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Agustin Vega-Frias <agustinv@codeaurora.org>
Cc: Ma Jun <majun258@huawei.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Link: http://lkml.kernel.org/r/20170707083959.10349-1-marc.zyngier@arm.com

parent f610c9d6

kernel/irq/irqdomain.c

+16 −0

Original line number	Diff line number	Diff line
		#define pr_fmt(fmt) "irq: " fmt

		#include <linux/acpi.h>
		#include <linux/debugfs.h>
		#include <linux/hardirq.h>
		#include <linux/interrupt.h>
		@@ -155,6 +156,21 @@ struct irq_domain __irq_domain_add(struct fwnode_handle fwnode, int size,
		domain->name = fwid->name;
		break;
		}
		#ifdef CONFIG_ACPI
		} else if (is_acpi_device_node(fwnode)) {
		struct acpi_buffer buf = {
		.length = ACPI_ALLOCATE_BUFFER,
		};
		acpi_handle handle;

		handle = acpi_device_handle(to_acpi_device_node(fwnode));
		if (acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf) == AE_OK) {
		domain->name = buf.pointer;
		domain->flags \|= IRQ_DOMAIN_NAME_ALLOCATED;
		}

		domain->fwnode = fwnode;
		#endif
		} else if (of_node) {
		char *name;