msi_setup_device_data(9)

🎀 MSI device data setup, but make it Kernel API Manual 🎀

okay so bestie, welcome to the Kernel API Manual page for msi_setup_device_data(9) — yes, the whole page is about setting up MSI device data, and it’s lowkey iconic. 💅

✨ NAME ✨

msi_setup_device_data — Setup MSI device data.

🌸 SYNOPSIS 🌸

int msi_setup_device_data (struct device *dev );

🧚 ARGUMENTS 🧚

• dev — Device for which MSI device data should be set up.

💖 RETURN 💖

0 on success, appropriate error code otherwise.

🦋 DESCRIPTION 🦋

okay so here’s the vibe: this can be called more than once for dev. No cap, if the MSI device data is already allocated, the call succeeds — so it’s not gonna be dramatic about it.

The allocated memory is automatically released when the device is destroyed. the way that cleanup is automatic? obsessed. no leak drama, fr fr. 😭✨

🌈 SEE ALSO 🌈

the whole friend group of MSI references, iykyk:

• 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_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_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)

bye bestie! this page’s source/version is ./kernel/irq, dated October 2026 — mwah 💋✨