msi_domain_a...s_all_locked(9)

🌸 msi_domain_alloc_irqs_all_locked(9) 🌸

okay bestie, welcome to the Kernel API Manual — yes we're reading kernel docs for fun now, this is who we are 💅

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✨ NAME ✨

msi_domain_alloc_irqs_all_locked — allocate all the interrupts from a MSI interrupt domain. all of them. every last one. 🎀

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✨ SYNOPSIS ✨

int msi_domain_alloc_irqs_all_locked (struct device *dev , unsigned int domid , int nirqs );

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✨ ARGUMENTS ✨

• dev — pointer to the struct device of the device you're allocating interrupts for 🫶
• domid — the id of the interrupt domain we're operating on, iykyk
• nirqs — the number of interrupts to allocate. yes, a number. keep counting bestie 🔥

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✨ DESCRIPTION ✨

so the way this works is: this function scans all the MSI descriptors of the MSI domain and allocates interrupts for all the unassigned ones. that's it, that's the vibe check 💀

it's the function you reach for when the MSI domain usage is one where the descriptor allocation is handled at the call site — for example PCI/MSI[X]. main character energy only ✨

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✨ RETURN ✨

0 on success, or an error code. slay if it's 0, 😭 if it's not.

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✨ SEE ALSO ✨

peep these, bestie — the whole friend group:

• the kernel file ./kernel/irq/msi.c
• 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_match_device_irq_domain(9)
• msi_domain_alloc_irqs_range_locked(9)
• msi_domain_alloc_irqs_range(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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ngl this page lives in ./kernel/irq and it's dated October 2026 — go off, future kernel 🦋

okay that's the whole thing, you ate that fr fr 👑 periodt 💖