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authorMarc Zyngier <marc.zyngier@arm.com>2015-10-13 12:51:36 +0100
committerThomas Gleixner <tglx@linutronix.de>2015-10-13 19:01:24 +0200
commitb145dcc45a6af0abfcf9b4de8006d40559c50fc6 (patch)
tree600837009a829d173619fed1e3ffff87f45689c7 /kernel/irq
parent1bf4ddc46c5d6123897a54cea4ffe3e90f30600b (diff)
downloadlinux-b145dcc45a6af0abfcf9b4de8006d40559c50fc6.tar.bz2
irqdomain: Add a fwnode_handle allocator
In order to be able to reference an irqdomain from ACPI, we need to be able to create an identifier, which is usually a struct device_node. This device node does't really fit the ACPI infrastructure, so we cunningly allocate a new structure containing a fwnode_handle, and return that. This structure doesn't really point to a device (interrupt controllers are not "real" devices in Linux), but as we cannot really deny that they exist, we create them with a new fwnode_type (FWNODE_IRQCHIP). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-and-tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: <linux-arm-kernel@lists.infradead.org> Cc: Tomasz Nowicki <tomasz.nowicki@linaro.org> Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Cc: Graeme Gregory <graeme@xora.org.uk> Cc: Jake Oshins <jakeo@microsoft.com> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Link: http://lkml.kernel.org/r/1444737105-31573-9-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/irqdomain.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index de6d7493190b..41151d394da7 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -27,6 +27,57 @@ static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
irq_hw_number_t hwirq, int node);
static void irq_domain_check_hierarchy(struct irq_domain *domain);
+struct irqchip_fwid {
+ struct fwnode_handle fwnode;
+ char *name;
+ void *data;
+};
+
+/**
+ * irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
+ * identifying an irq domain
+ * @data: optional user-provided data
+ *
+ * Allocate a struct device_node, and return a poiner to the embedded
+ * fwnode_handle (or NULL on failure).
+ */
+struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
+{
+ struct irqchip_fwid *fwid;
+ char *name;
+
+ fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
+ name = kasprintf(GFP_KERNEL, "irqchip@%p", data);
+
+ if (!fwid || !name) {
+ kfree(fwid);
+ kfree(name);
+ return NULL;
+ }
+
+ fwid->name = name;
+ fwid->data = data;
+ fwid->fwnode.type = FWNODE_IRQCHIP;
+ return &fwid->fwnode;
+}
+
+/**
+ * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
+ *
+ * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
+ */
+void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
+{
+ struct irqchip_fwid *fwid;
+
+ if (WARN_ON(fwnode->type != FWNODE_IRQCHIP))
+ return;
+
+ fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
+ kfree(fwid->name);
+ kfree(fwid);
+}
+
/**
* __irq_domain_add() - Allocate a new irq_domain data structure
* @of_node: optional device-tree node of the interrupt controller