msi_match_device_irq_domain(9)

💅 msi_match_device_irq_domain(9) — a Kernel API Manual moment ✨

okay so bestie, welcome to the Kernel API Manual, and today's main character is msi_match_device_irq_domain. yes it's a long name. yes it ate. let's get into it 🎀

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✨ NAME ✨

msi_match_device_irq_domain — matches a device irq domain against a bus token. that's the whole vibe check, no cap 🌸

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🦋 SYNOPSIS 🦋

bool msi_match_device_irq_domain (struct device *dev , unsigned int
domid , enum irq_domain_bus_token bus_token );

like literally three things go in and a bool comes out, it's giving vending machine 💖

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💜 ARGUMENTS 💜

• dev — pointer to the device, bestie. that's your star of the show 🌟
• domid — the domain id. iconic little number, keep it safe 🎀
• bus_token — the bus token to match against the domain bus token. yes, token match-up, it's a whole thing 🫶

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🔥 RETURN 🔥

True if the device domain exists and the bus tokens match. that's it. that's the tea 💀

lowkey if either part of that fails you're getting a False, so don't come for me 🙈

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🌈 SEE ALSO 🌈

so many siblings, our girl has a huge family, let's meet them:

• Kubernetes file ./kernel/irq/msi.c — jk, it's a kernel file, but you knew that 💅
• 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_domain_set_affinity(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_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)

look at that list. thirty-three whole pages of friends. she's never alone at the function party 👑🧚

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ngl bestie, read the SEE ALSO before you go poking at irq domains, i'm literally begging 🥺

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and that's a wrap on our girl 🌸 brought to you by the fine folks over at ./kernel/irq, dated October 2026, and yes the manual page's own name is msi_match_device_irq_domain(9) — say it three times fast for good luck 🍓💖 periodt