From: Linus Walleij <linus.wall...@linaro.org> 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: Rob Herring <rob.herr...@calxeda.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Grant Likely <grant.lik...@secretlab.ca> Cc: Paul Mundt <let...@linux-sh.org> Cc: Russell King <li...@arm.linux.org.uk> Cc: Lee Jones <lee.jo...@linaro.org> Signed-off-by: Linus Walleij <linus.wall...@linaro.org> --- ChangeLog v1->v2: - Switch descriptor allocation on IS_ENABLED(CONFIG_SPARSE_IRQ) so it won't attempt to allocate descriptors in the non-sparse case. - Use of_node_to_nid() to make sure we work on platforms with their own node concept. - Specify irq_alloc_descs(first_irq, first_irq ...) to emulate irq_alloc_desc_at(). --- kernel/irq/irqdomain.c | 33 ++++++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-) diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 49a7772..4e69e24 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -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 @@ -162,11 +163,33 @@ 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 - return irq_domain_add_linear(of_node, size, ops, host_data); + } + + /* A linear domain is the default */ + return irq_domain_add_linear(of_node, size, ops, host_data); } /** -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/