msi_domain_set_affinity(9)

💅 msi_domain_set_affinity(9) — Kernel API Manual 💅

Okay bestie, this is the page for msi_domain_set_affinity, and it's giving very specific kernel-irq energy. Let's get into it. 💖

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💖 NAME 💖

msi_domain_set_affinity — the generic affinity setter function for MSI domains. That's the assignment, periodt. ✨

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✨ SYNOPSIS ✨

int msi_domain_set_affinity (struct irq_data *irq_data , const struct
       cpumask *mask , bool force );

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🎀 ARGUMENTS 🎀

• irq_data — the irq data associated to the interrupt. That's the irq-data bestie in question. 🫶
• mask — the affinity mask to set. This is the mask you're setting, no cap. 🌸
• force — flag to enforce setting (disable online checks). So yes, it's the enforce-it flag, and it disables online checks. 💅

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🦋 DESCRIPTION 🦋

Okay so this function is intended to be used by MSI interrupt controllers which are implemented with hierarchical domains. That's the intended use case — hierarchical-domain MSI interrupt controllers. That's the whole description vibe. 🦋

No extra lore, no secret side quests, just that. ✨

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🌸 RETURN 🌸

It returns an IRQ_SET_MASK_* result code. That's the return vibe — one of those IRQ_SET_MASK_* result codes. 🫶

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👀 SEE ALSO 👀

Kernel file ./kernel/irq/msi.c — and then the whole linked-bestie list:

• struct msi_device_data(9)
• struct msi_ctrl(9)
• msi_alloc_desc(9)
• msi_domain_insert_msi_desc(9)
• msi_domain_free_msi_descs_range(9)
• msi_domain_add_simple_msi_descs(9)
• msi_setup_device_data(9)
• __msi_lock_descs(9)
• __msi_unlock_descs(9)
• msi_domain_first_desc(9)
• msi_next_desc(9)
• msi_domain_get_virq(9)
• msi_device_populate_sysfs(9)
• msi_device_destroy_sysfs(9)
• msi_create_irq_domain(9)
• msi_create_parent_irq_domain(9)
• msi_parent_init_dev_msi_info(9)
• msi_create_device_irq_domain(9)
• msi_remove_device_irq_domain(9)
• msi_match_device_irq_domain(9)
• msi_domain_alloc_irqs_range_locked(9)
• msi_domain_alloc_irqs_range(9)
• msi_domain_alloc_irqs_all_locked(9)
• msi_domain_alloc_irq_at(9)
• msi_device_domain_alloc_wired(9)
• msi_domain_free_irqs_range_locked(9)
• msi_domain_free_irqs_range(9)
• msi_domain_free_irqs_all_locked(9)
• msi_domain_free_irqs_all(9)
• msi_device_domain_free_wired(9)
• msi_get_domain_info(9)
• msi_device_has_isolated_msi(9)

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mwah 💋 — that's the tea from ./kernel/irq, Kernel API Manual, October 2026, for msi_domain_set_affinity(9). Stay slay, bestie 🎀