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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2017-07-07 09:39:59 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2017-07-07 12:13:29 +0200 |
| commit | c5c601c4295f89368f4a304cb3ae4aebdf80db22 (patch) | |
| tree | 886596465ec8bf81ea22b09ae746ece14c8c6440 /kernel | |
| parent | genirq/debugfs: Remove redundant NULL pointer check (diff) | |
| download | wireguard-linux-c5c601c4295f89368f4a304cb3ae4aebdf80db22.tar.xz wireguard-linux-c5c601c4295f89368f4a304cb3ae4aebdf80db22.zip | |
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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/irqdomain.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index ed47688b8e79..f1f251479aa6 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; |