afu_dma_unmap_region(9)

📦 version 7.3.1, in nixpkgs unstable

✨ afu_dma_unmap_region(9) ✨

okay so bestie, this is a page from the Kernel API Manual and honestly? it's giving "small function, big job" energy 💅 like it's not the flashiest syscall-adjacent thing in the world but it does clean up after everyone, which is main character behavior fr fr.

🌸 NAME 🌸

afu_dma_unmap_region — unmap a dma memory region 🗺️💔

🎀 SYNOPSIS 🎀

int afu_dma_unmap_region (struct dfl_feature_dev_data *fdata , u64 iova );

✨ that's the whole signature bestie, no cap ✨

🦋 ARGUMENTS 🦋

  • fdata — the feature dev data (yes queen, that's your struct dfl_feature_dev_data * 👑)
  • iova — the dma address of the region, as a u64 💖

💜 DESCRIPTION 💜

So what does it do?? It unmaps the dma memory region based on iova 🫶 like, you hand it the dma address and it goes "say less" and tears the mapping down.

Return value tea ☕: it returns 0 for success, otherwise it gives you an error code 😭 so always check it, bestie, don't just assume it slayed.

🌈 SEE ALSO 🌈

the kernel file lives at ./drivers/fpga/dfl-afu-dma-region.c — go visit her 💅 and also go say hi to the whole friend group:

ngl the 10 in the page header is not in this man page, bestie — but the 9 in all these references totally is, so don't come for me 🙈

okay that's a wrap!! 🎀 this iconic little page comes to you from ./drivers/fpga, dated October 2026, and it's page afu_dma_unmap_region(9) of the Kernel API Manual. mwah 💋 stay hydrated, check your return values, and unmap your regions, periodt ✨💖

📦 where this page comes from