FRAMEBUFFER DMA HELPER FUNCTIONS(9)

💅 framebuffer dma helper functions (9) — Kernel API Manual ✨

okay bestie, welcome to the framebuffer dma helper functions page from the Kernel API Manual — section 9, iconic, no notes 🎀

🌸 NAME 🌸

framebuffer dma helper functions — literally the little helper squad that helps you build a DMA-contiguous framebuffer 🫶

✨ DESCRIPTION ✨

So what does this give you? Helper functions for creating a DMA-contiguous framebuffer. That's the whole vibe. 💖

Now, plot twist: depending on the platform, those buffers might not be physically contiguous at all 😭 — they might be mapped through an IOMMU or some similar mechanism. Or, alternatively, they might be allocated straight out of physically-contiguous memory (using, for instance, CMA, or a pool of memory reserved at early boot). 🌈

And who handles all that messy allocation drama behind the scenes? Not you, bestie — the DMA mapping API does it. Behind the scenes. You just sit there looking cute. 💅

Then there's drm_gem_fb_create — she's the main character here 👑 — and she gets used in the drm_mode_config_funcs.fb_create callback function to create a DMA-contiguous framebuffer.

ngl that's the whole description. short and slay. ✨

🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/drm_fb_dma_helper.c — go read the source, iykyk 📖
• drm_fb_dma_get_gem_obj(9)
• drm_fb_dma_get_gem_addr(9)
• drm_fb_dma_sync_non_coherent(9)
• drm_fb_dma_get_scanout_buffer(9)

and that's the page, bestie!! 🦋 big sign-off energy: this one came from ./drivers/gpu/drm, dated October 2026, and it's still titled framebuffer ...er functions(9) — periodt. 💜🎀✨