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irqdomain: augment add_simple() to allocate descs 

Currently we rely on all IRQ chip instances to dynamically
allocate their IRQ descriptors unless they use the linear
IRQ domain. So for irqdomain_add_legacy() and
irqdomain_add_simple() the caller need to make sure that
descriptors are allocated.

Let's slightly augment the yet unused irqdomain_add_simple()
to also allocate descriptors as a means to simplify usage
and avoid code duplication throughout the kernel.

We warn if descriptors cannot be allocated, e.g. if a
platform has the bad habit of hogging descriptors at boot
time.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2012-09-27 14:59:39 +02:00
parent c22df08c7f
commit 2854d167cc
1 changed files with 28 additions and 5 deletions
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31
kernel/irq/irqdomain.c
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@ -148,7 +148,8 @@ static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
* @host_data: Controller private data pointer
*
* Allocates a legacy irq_domain if irq_base is positive or a linear
* domain otherwise.
* domain otherwise. For the legacy domain, IRQ descriptors will also
* be allocated.
*
* This is intended to implement the expected behaviour for most
* interrupt controllers which is that a linear mapping should
@ -162,10 +163,32 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
const struct irq_domain_ops *ops,
void *host_data)
{
if (first_irq > 0)
return irq_domain_add_legacy(of_node, size, first_irq, 0,
if (first_irq > 0) {
int irq_base;
if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
/*
* Set the descriptor allocator to search for a
* 1-to-1 mapping, such as irq_alloc_desc_at().
* Use of_node_to_nid() which is defined to
* numa_node_id() on platforms that have no custom
* implementation.
*/
irq_base = irq_alloc_descs(first_irq, first_irq, size,
of_node_to_nid(of_node));
if (irq_base < 0) {
WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
first_irq);
irq_base = first_irq;
}
} else
irq_base = first_irq;
return irq_domain_add_legacy(of_node, size, irq_base, 0,
ops, host_data);
else
}
/* A linear domain is the default */
return irq_domain_add_linear(of_node, size, ops, host_data);
}