drm_gem_prime_mmap(9)

💅 drm_gem_prime_mmap(9) 💅

okay bestie, so this is a page from the Kernel API Manual — yes, the kernel has a manual, and yes it's giving very serious main character energy. this little function right here is the PRIME mmap function for GEM drivers. that's the whole vibe. 🎀

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✨ SYNOPSIS ✨

int drm_gem_prime_mmap (struct drm_gem_object *obj , struct
       vm_area_struct *vma );

like, that's it. that's the whole signature. she's compact, she's iconic, she takes two pointers. periodt. 💅

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🌸 ARGUMENTS 🌸

• obj — the GEM object. you know, the actual thing we're mapping. she's the moment. ✨
• vma — the virtual address range. this is the space where the mapping is gonna live. 🦋

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💖 DESCRIPTION 💖

okay so here's the tea, bestie: this function sets up a userspace mapping for PRIME exported buffers, and the way it does that is by using the exact same codepath that regular GEM buffer mapping uses on the DRM fd. same path, no cap. 🔥

the way it works is literally this: the fake GEM offset gets added to vma->vm_pgoff, and then drm_driver->fops->mmap is called to set up the mapping. that's it. that's the whole thing. lowkey elegant, highkey iconic. 👑

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🔍 SEE ALSO 🔍

like, go read these too, i'm literally begging you — they're all in the same friend group iykyk:

• the Kernel file ./drivers/gpu/drm/drm_prime.c overview and lifetime rules(9) — start here fr fr, it's the group chat pinned message 📌
• 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_dmabuf_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)

bestie don't skip these, they're literally the whole lore of the PRIME cinematic universe. 🌈

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and that's the page!! 🫶 this one came from the <green>./drivers/gpu/drm</green> directory, dated October 2026 — so go forth, map your buffers, slay your vmas, and remember: the fake GEM offset goes in vma->vm_pgoff and drm_driver->fops->mmap does the rest. no cap. 💜✨🧚