irq_set_msi_desc(9)

💅 irq_set_msi_desc 💅

okay bestie, real talk — this one's from the Kernel API Manual, section 9, and it's lowkey one of those tiny functions that does exactly what it says on the tin. no plot twists, no secret clauses. let's get into it 🫶

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🌸 NAME 🌸

irq_set_msi_desc — set MSI descriptor data for an irq

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✨ SYNOPSIS ✨

int irq_set_msi_desc (unsigned int irq , struct msi_desc *entry );

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🎀 ARGUMENTS 🎀

• irq — the interrupt number, aka which irq we're talking about 💫
• entry — a pointer to the MSI descriptor data, aka the actual info being handed over 🦋

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💖 DESCRIPTION 💖

Set the MSI descriptor entry for an irq. that's it. that's the whole vibe. you hand it an irq and a descriptor, and the descriptor gets set for that irq. short and iconic, no notes 👑

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🌈 SEE ALSO 🌈

okay so this is the part where it gets real — there's a whole friend group here. the kernel file ./kernel/irq/chip.c is home base, and then we have:

• irq_set_chip(9)
• irq_set_irq_type(9)
• irq_set_handler_data(9)
• irq_set_msi_desc_off(9)
• irq_set_chip_data(9)
• irq_disable(9)
• handle_nested_irq(9)
• handle_simple_irq(9)
• handle_untracked_irq(9)
• handle_level_irq(9)
• handle_fasteoi_irq(9)
• handle_fasteoi_nmi(9)
• handle_edge_irq(9)
• handle_percpu_irq(9)
• handle_percpu_devid_irq(9)
• irq_cpu_online(9)
• irq_cpu_offline(9)
• handle_fasteoi_ack_irq(9)
• handle_fasteoi_mask_irq(9)
• irq_chip_set_parent_state(9)
• irq_chip_get_parent_state(9)
• irq_chip_shutdown_parent(9)
• irq_chip_startup_parent(9)
• irq_chip_enable_parent(9)
• irq_chip_disable_parent(9)
• irq_chip_ack_parent(9)
• irq_chip_mask_parent(9)
• irq_chip_mask_ack_parent(9)
• irq_chip_unmask_parent(9)
• irq_chip_eoi_parent(9)
• irq_chip_set_affinity_parent(9)
• irq_chip_set_type_parent(9)
• irq_chip_retrigger_hierarchy(9)
• irq_chip_set_vcpu_affinity_parent(9)
• irq_chip_set_wake_parent(9)
• irq_chip_request_resources_parent(9)
• irq_chip_release_resources_parent(9)
• irq_chip_compose_msi_msg(9)
• irq_chip_pm_get(9)
• irq_chip_pm_put(9)

fr fr, read them all, they're all doing their little part 💀✨

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and that's the page, bestie!! this one came straight out of ./kernel/irq, dated October 2026 — mwah, go touch some grass now 🌱💜