zynqmp_disp..._request_dma(9)

📦 version 7.3.1, in nixpkgs unstable

💅 zynqmp_disp_layer_request_dma — the DMA-bagging era 💅

okay bestie, welcome to the Kernel API Manual ✨ this one's a little function from the DRM/Xilinx corner of the kernel and honestly it does exactly what it says on the tin: it goes and gets the DMA channels a layer needs. no cap, that's the whole vibe.

🌸 NAME 🌸

zynqmp_disp_layer_request_dma — request DMA channels for a layer 🎀

✨ SYNOPSIS ✨

int zynqmp_disp_layer_request_dma (struct zynqmp_disp *disp , struct
       zynqmp_disp_layer *layer );

it's giving "two args, one int, zero drama" 💖

🫶 ARGUMENTS 🫶

  • disp — the display controller. the big main character of this whole subsystem, iykyk 👑
  • layer — the layer. the one actually getting its DMA situation sorted 🦋

🔥 DESCRIPTION 🔥

so what does it do? it requests all the DMA engine channels that the layer needs. all of them. every single one. not like, some of them. all. 💀✨

⭐ RETURN ⭐

  • 0 on success 🎉 (slay)
  • otherwise you get the DMA channel request error back 😭 — so if it's not 0, that's your error, fr fr

🌈 SEE ALSO 🌈

buckle up bestie, this list is long and honestly iconic of the kernel docs 🫶

like I said. long. but every one of them is here, and that's the vibe check passed 💅

and that's the whole page, bestie 🧚💜 this lil' doc lives in ./drivers/gpu/drm/xlnx and was stamped October 2026 — go request those DMA channels and absolutely ate, periodt 🎀🌸

📦 where this page comes from