STRUCT DMA_HEAP_ALLOCATION_DATA(9)

✨ NAME ✨

struct dma_heap_allocation_data — it's the metadata your userspace hands over when it wants an allocation 🎀

Manual: Kernel API Manual, bestie. Yes we're in the kernel docs now, put your seatbelt on 💅

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🌸 SYNOPSIS 🌸

struct dma_heap_allocation_data {
    __u64 len;
    __u32 fd;
    __u32 fd_flags;
    __u64 heap_flags;
 };

That's literally the whole struct. Four little fields. Iconic behavior, no notes 🫶

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🧩 Members 🧩

• len — the size of the allocation. That's how much you're asking for, bestie, so be honest about it 🍓
• fd — this bad boy will be populated with a fd, and that fd gives you the handle to the allocated dma-buf. It's giving "I'll fill it in for you, don't worry about it" ✨
• fd_flags — the file descriptor flags used when allocating 🌸
• heap_flags — the flags that get passed to the heap. Yeah. They go to the heap. That's the vibe 💜

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👑 DESCRIPTION 👑

So the deal is: this struct is provided by userspace as an argument to the ioctl 🦋

That's it. That's the description. Userspace hands it over, the ioctl takes it, everybody moves on with their day. Main character energy for a metadata struct, honestly 😭

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🌈 SEE ALSO 🌈

• Kernel file ./include/uapi/linux/dma-heap.h — the source of truth, iykyk 📁
• DMABUF Heaps Userspace API(9) — the whole userspace side of the story 🧚
• DMA_HEAP_IOCTL_ALLOC - allocate memory from pool(9) — the ioctl that actually takes this struct, the one we were just talking about 🔥

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ngl bestie, this page is short and sweet — but every field still matters, so don't skip any of them 💖

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okay that's the whole thing, periodt 💅 this lil masterpiece lives in ./include/uapi/linux and the docs are dated October 2026 — catch you in the group chat, love u, bye 🫶✨🌈