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author | Marc Zyngier <marc.zyngier@arm.com> | 2015-10-13 12:51:36 +0100 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2015-10-13 19:01:24 +0200 |
commit | b145dcc45a6af0abfcf9b4de8006d40559c50fc6 (patch) | |
tree | 600837009a829d173619fed1e3ffff87f45689c7 /kernel/irq | |
parent | 1bf4ddc46c5d6123897a54cea4ffe3e90f30600b (diff) | |
download | linux-stable-b145dcc45a6af0abfcf9b4de8006d40559c50fc6.tar.gz linux-stable-b145dcc45a6af0abfcf9b4de8006d40559c50fc6.tar.bz2 linux-stable-b145dcc45a6af0abfcf9b4de8006d40559c50fc6.zip |
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.c | 51 |
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 |