drm_gem_dmabuf_mmap(9)

👑 drm_gem_dmabuf_mmap(9) — the Kernel API Manual page your bestie needed

okay so picture this: you're deep in the Kernel API Manual, flipping through pages, and you land on drm_gem_dmabuf_mmap(9). and honestly? she's a short one. a little icon, a little legend. let's get into it 💅

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✨ NAME ✨

drm_gem_dmabuf_mmap — the dma_buf mmap implementation for GEM, no cap 🎀

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🌸 SYNOPSIS 🌸

int drm_gem_dmabuf_mmap (struct dma_buf *dma_buf , struct vm_area_struct
       *vma );

like, that's the whole signature. two args, one int coming back at you. periodt.

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🦋 ARGUMENTS 🦋

• dma_buf — the buffer that's getting mapped. she's the main character here 🫶
• vma — the virtual address range. the vibes zone, if you will ✨

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💖 DESCRIPTION 💖

so what does she actually do? she provides the memory mapping for the buffer. that's it, that's the job 🎀

and the cool part: you can literally use her as the dma_buf_ops.mmap callback. plug her right in, she's built for it. then she just forwards everything to drm_gem_prime_mmap — no extra drama, no side quests, just a clean handoff 🧚

returns 0 on success, or a negative error code if it fails 😭 literally that simple.

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🔥 SEE ALSO 🔥

okay bestie, this list is long, so buckle up — every single one of these is getting its moment 👑

• Kernel file ./drivers/gpu/drm/drm_prime.c overview and lifetime rules(9)
• drm_gem_dmabuf_export(9)
• drm_gem_dmabuf_release(9)
• drm_gem_prime_fd_to_handle(9)
• drm_gem_prime_handle_to_dmabuf(9)
• drm_gem_prime_handle_to_fd(9)
• PRIME Helpers(9)
• drm_gem_map_attach(9)
• drm_gem_map_detach(9)
• drm_gem_map_dma_buf(9)
• drm_gem_unmap_dma_buf(9)
• drm_gem_dmabuf_vmap(9)
• drm_gem_dmabuf_vunmap(9)
• drm_gem_prime_mmap(9)
• drm_prime_pages_to_sg(9)
• drm_prime_get_contiguous_size(9)
• drm_gem_prime_export(9)
• drm_gem_is_prime_exported_dma_buf(9)
• drm_gem_prime_import_dev(9)
• drm_gem_prime_import(9)
• drm_prime_sg_to_page_array(9)
• drm_prime_sg_to_dma_addr_array(9)
• drm_prime_gem_destroy(9)

like… go read them. all of them. i'll wait 💜

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ngl this one's basically a fancy relay race — she catches the mmap and passes it straight to drm_gem_prime_mmap. short page, iconic behaviour 🌟

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and that's the whole page, bestie!! source lives at ./drivers/gpu/drm and this cutie is dated October 2026 — mwah, go forth and map your buffers 💅🎀🌈