STRUCT MSI_ALLOC_INFO(9)

💖 struct msi_alloc_info(9) 💖

okay bestie, we're in the Kernel API Manual and this page is all about struct msi_alloc_info — the default structure for MSI interrupt allocation. it's giving "default shape for this job," and we're gonna read it together. no cap. ✨

✨ NAME ✨

struct msi_alloc_info — Default structure for MSI interrupt allocation. 💅

🦋 SYNOPSIS 🦋

here's the struct, copied exactly and living its best life in a code block:

       struct msi_alloc_info {
           struct msi_desc                 *desc;
           irq_hw_number_t hwirq;
           unsigned long                   flags;
           union {
             unsigned long           ul;
             void *ptr;
           } scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
        };

🫶 Members 🫶

• desc — Pointer to msi descriptor. 👑
• hwirq — Associated hw interrupt number in the domain. 🌸
• scratchpad — Storage for implementation specific scratch data. 🎀

💅 Description 💅

so the tea is: architectures can provide their own implementation by not including asm-generic/msi.h into their arch specific header file. that's the whole move — no extra sauce from me, fr fr. 🦋

🌈 SEE ALSO 🌈

go peek at the Kernel file ./include/asm-generic/msi.h — that's the reference this page points you to. 🔥

kisses bestie! 💋 this page's source/version is ./include/asm-generic, and the date on it is October 2026. mwah! 🎀