__irq_resolve_mapping(9)

💅 __irq_resolve_mapping ✨

okay so this is the __irq_resolve_mapping(9) page from the Kernel API Manual, and bestie, it's literally a whole thing about finding your linux irq from a hw irq number. it's giving "short but iconic" — let's get into it 🫶

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🌸 NAME 🌸

__irq_resolve_mapping — Find a linux irq from a hw irq number.

like, that's the whole gig. you got a hardware number, you want the linux one. slay.

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✨ SYNOPSIS ✨

struct irq_desc * __irq_resolve_mapping (struct irq_domain *domain ,
irq_hw_number_t hwirq , unsigned int *irq );

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🎀 ARGUMENTS 🎀

• domain — the domain owning this hardware interrupt, i.e. the main character that's in charge of this hw interrupt 💖
• hwirq — the hardware irq number in that domain space, fr fr the raw one
• irq — optional pointer to return the Linux irq if required — no cap, it's optional, so you can pass it or not, your call 🦋

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🦋 DESCRIPTION 🦋

Returns the interrupt descriptor. that's it, that's the sentence. periodt. 💅

like, genuinely, it's just handing you back a struct irq_desc *. lowkey obsessed with how unbothered this description is.

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🌈 SEE ALSO 🌈

the Kernel file ./kernel/irq/irqdomain.c and honestly a whole friend group of functions — here's the full squad, no one left behind 👑

• __irq_domain_alloc_fwnode(9)
• irq_domain_free_fwnode(9)
• irq_domain_instantiate(9)
• irq_domain_remove(9)
• irq_domain_create_simple(9)
• irq_find_matching_fwspec(9)
• irq_set_default_domain(9)
• irq_get_default_domain(9)
• irq_create_direct_mapping(9)
• irq_create_mapping_affinity(9)
• irq_dispose_mapping(9)
• irq_domain_xlate_onecell(9)
• irq_domain_xlate_twocell(9)
• irq_domain_xlate_twothreecell(9)
• irq_domain_xlate_onetwocell(9)
• irq_domain_translate_onecell(9)
• irq_domain_translate_twocell(9)
• irq_domain_translate_twothreecell(9)
• irq_domain_reset_irq_data(9)
• irq_domain_disconnect_hierarchy(9)
• irq_domain_get_irq_data(9)
• irq_domain_set_hwirq_and_chip(9)
• irq_domain_set_info(9)
• irq_domain_free_irqs_common(9)
• irq_domain_free_irqs_top(9)
• __irq_domain_alloc_irqs(9)
• irq_domain_push_irq(9)
• irq_domain_pop_irq(9)
• irq_domain_free_irqs(9)
• irq_domain_alloc_irqs_parent(9)
• irq_domain_free_irqs_parent(9)
• irq_domain_activate_irq(9)
• irq_domain_deactivate_irq(9)

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and that's the vibe check, bestie — this page is from ./kernel/irq, dated October 2026, and the whole thing is filed under __irq_resolve_mapping(9) in case you need to find it again 💜 mwah, go resolve some mappings 🧚‍♀️