STRUCT DRM_GEM_DMA_OBJECT(9)

📦 version 7.3.1, in nixpkgs unstable

💖 struct drm_gem_dma_object(9) 💖

okay bestie, welcome to the Kernel API Manual (section 9, yes we're that girl) and today's main character is struct drm_gem_dma_object — literally a GEM object backed by DMA memory allocations. no cap, that's the whole vibe. 🎀

✨ NAME ✨

struct drm_gem_dma_object — GEM object backed by DMA memory allocations 🦋

🌸 SYNOPSIS 🌸

struct drm_gem_dma_object {
    struct drm_gem_object base;
    dma_addr_t dma_addr;
    struct sg_table *sgt;
    void *vaddr;
    bool map_noncoherent;
 };

like, that's the whole struct. she's compact. she's iconic. she ate. 💅

🫶 Members 🫶

  • base — the base GEM object. the foundation, the blueprint, the mother of the whole situation 👑
  • dma_addr — DMA address of the backing memory. where the memory actually lives in DMA-land 📍
  • sgt — scatter/gather table for imported PRIME buffers. and listen — this table can have more than one entry, but no worries because they're guaranteed to have contiguous DMA addresses. multiple entries, one continuous DMA-address vibe. iykyk ✨
  • vaddr — kernel virtual address of the backing memory. the kernel's own little window into it 🪟
  • map_noncoherent — if true, the GEM object is backed by non-coherent memory. that's it, that's the flag 🚩

🌈 SEE ALSO 🌈

  • Kernel file: ./include/drm/drm_gem_dma_helper.h

and the whole friend group, fr fr:

💀 that's the whole page bestie, go read the helper header if you want the real lore

and that's a wrap! this one came from ./include/drm, dated October 2026, and she's serving struct drm_gem_dma_object(9) energy forever. mwah 💋

📦 where this page comes from