STRUCT MSI_DOMAIN_INFO(9)

💖 struct msi_domain_info(9) 💖

okay so this is from the Kernel API Manual bestie, and it's literally the whole vibe of MSI interrupt domain data — like, all the info a domain needs to exist and slay ✨

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🌸 NAME 🌸

struct msi_domain_info — MSI interrupt domain data. that's it, that's the girl 💅

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✨ SYNOPSIS ✨

struct msi_domain_info {
    u32 flags;
    enum irq_domain_bus_token       bus_token;
    unsigned int                    hwsize;
    struct msi_domain_ops           *ops;
    struct device                   *dev;
    struct irq_chip                 *chip;
    void *chip_data;
    irq_flow_handler_t handler;
    void *handler_data;
    const char                      *handler_name;
    msi_alloc_info_t *alloc_data;
    void *data;
 };

like, look at her. structurally flawless. no notes 🫶

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🎀 Members 🎀

• flags — the flags that describe the features and capabilities, iykyk 🚩
• bus_token — the domain bus token, it's giving passport energy 🛂
• hwsize — the hardware table size or the software index limit. and listen: if it's 0 then the size is considered unlimited, and it gets initialized to the maximum software index limit by the domain creation code. periodt ✨
• ops — the callback data structure, the main character of the operation 🎬
• dev — the device which creates the domain 🧚
• chip — Optional: associated interrupt chip 💜
• chip_data — Optional: associated interrupt chip data 🍓
• handler — Optional: associated interrupt flow handler 🌈
• handler_data — Optional: associated interrupt flow handler data 🦋
• handler_name — Optional: associated interrupt flow handler name 🏷️
• alloc_data — Optional: associated interrupt allocation data 💫
• data — Optional: domain specific data, the little extra sprinkle on top 🔥

bestie notice how many of these say Optional — like they're not mandatory, they're just there if the vibe calls for it 💅

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👑 SEE ALSO 👑

Kernel file ./include/linux/msi.h — and the whole friend group:

• struct msi_msg(9)
• struct pci_msi_desc(9)
• union msi_domain_cookie(9)
• struct msi_desc_data(9)
• struct msi_desc(9)
• struct msi_dev_domain(9)
• msi_first_desc(9)
• msi_domain_for_each_desc(9)
• msi_for_each_desc(9)
• msi_msg_set_addr(9)
• msi_insert_msi_desc(9)
• msi_free_msi_descs_range(9)
• msi_free_msi_descs(9)
• struct msi_domain_ops(9)
• struct msi_domain_template(9)
• struct msi_parent_ops(9)

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and that's the whole page bestie, no cap 😭💖

this one lives in ./include/linux and it's dated October 2026 — so like, future iconic behavior fr fr 🎀✨🦋

go off, read the source, stan the kernel 💅👑