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| author | Marc Zyngier <maz@kernel.org> | 2021-05-04 14:00:13 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-06-10 13:09:18 +0100 |
| commit | d22558dd0a6c888b1829f9d3a0a627e330e27585 (patch) | |
| tree | c8b8ac1f4db942b3330890eb894500eedafb6376 /kernel/irq | |
| parent | d4a45c68dc81f9117ceaff9f058d5fae674181b9 (diff) | |
| download | linux-d22558dd0a6c888b1829f9d3a0a627e330e27585.tar.gz | |
irqdomain: Introduce irq_resolve_mapping()
Rework irq_find_mapping() to return an both an irq_desc pointer, optionally the virtual irq number, and rename the result to __irq_resolve_mapping(). a new helper called irq_resolve_mapping() is provided for code that doesn't need the virtual irq number. irq_find_mapping() is also rewritten in terms of __irq_resolve_mapping(). Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/irqdomain.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 8fbadeefc814..51c483ce2447 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -884,29 +884,34 @@ void irq_dispose_mapping(unsigned int virq) EXPORT_SYMBOL_GPL(irq_dispose_mapping); /** - * irq_find_mapping() - Find a linux irq from a hw irq number. + * __irq_resolve_mapping() - Find a linux irq from a hw irq number. * @domain: domain owning this hardware interrupt * @hwirq: hardware irq number in that domain space + * @irq: optional pointer to return the Linux irq if required + * + * Returns the interrupt descriptor. */ -unsigned int irq_find_mapping(struct irq_domain *domain, - irq_hw_number_t hwirq) +struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq, + unsigned int *irq) { + struct irq_desc *desc = NULL; struct irq_data *data; /* Look for default domain if necessary */ if (domain == NULL) domain = irq_default_domain; if (domain == NULL) - return 0; + return desc; if (irq_domain_is_nomap(domain)) { if (hwirq < domain->revmap_size) { data = irq_domain_get_irq_data(domain, hwirq); if (data && data->hwirq == hwirq) - return hwirq; + desc = irq_data_to_desc(data); } - return 0; + return desc; } rcu_read_lock(); @@ -915,10 +920,17 @@ unsigned int irq_find_mapping(struct irq_domain *domain, data = rcu_dereference(domain->revmap[hwirq]); else data = radix_tree_lookup(&domain->revmap_tree, hwirq); + + if (likely(data)) { + desc = irq_data_to_desc(data); + if (irq) + *irq = data->irq; + } + rcu_read_unlock(); - return data ? data->irq : 0; + return desc; } -EXPORT_SYMBOL_GPL(irq_find_mapping); +EXPORT_SYMBOL_GPL(__irq_resolve_mapping); /** * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings |