Commit-ID: c5c601c4295f89368f4a304cb3ae4aebdf80db22 Gitweb: http://git.kernel.org/tip/c5c601c4295f89368f4a304cb3ae4aebdf80db22 Author: Marc Zyngier <marc.zyng...@arm.com> AuthorDate: Fri, 7 Jul 2017 09:39:59 +0100 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Fri, 7 Jul 2017 12:13:29 +0200
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.ga...@huawei.com> Signed-off-by: Marc Zyngier <marc.zyng...@arm.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: Agustin Vega-Frias <agust...@codeaurora.org> Cc: Ma Jun <majun...@huawei.com> Cc: Hanjun Guo <hanjun....@linaro.org> Link: http://lkml.kernel.org/r/20170707083959.10349-1-marc.zyng...@arm.com --- kernel/irq/irqdomain.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index ed47688..f1f2514 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1,5 +1,6 @@ #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;
