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Date: Fri, 7 Jul 2017 03:16:15 -0700
From: tip-bot for Marc Zyngier <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: majun258@...wei.com, john.garry@...wei.com, hpa@...or.com,
hanjun.guo@...aro.org, linux-kernel@...r.kernel.org,
tglx@...utronix.de, agustinv@...eaurora.org, mingo@...nel.org,
marc.zyngier@....com
Subject: [tip:irq/urgent] irqdomain: Allow ACPI device nodes to be used as
irqdomain identifiers
Commit-ID: c5c601c4295f89368f4a304cb3ae4aebdf80db22
Gitweb: http://git.kernel.org/tip/c5c601c4295f89368f4a304cb3ae4aebdf80db22
Author: Marc Zyngier <marc.zyngier@....com>
AuthorDate: Fri, 7 Jul 2017 09:39:59 +0100
Committer: Thomas Gleixner <tglx@...utronix.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.garry@...wei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Agustin Vega-Frias <agustinv@...eaurora.org>
Cc: Ma Jun <majun258@...wei.com>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Link: http://lkml.kernel.org/r/20170707083959.10349-1-marc.zyngier@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;
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