dma_region_check_iova(9)

📦 version 7.3.1, in nixpkgs unstable

💖 dma_region_check_iova(9) — the vibe check for your DMA region 💖

okay so bestie, welcome to the Kernel API Manual, section 9. today's main character is dma_region_check_iova, and she is literally just here to answer one question: is this memory area fully inside the region or not? that's it. that's the whole job. and honestly? she ate. 🎀

✨ SYNOPSIS ✨

bool dma_region_check_iova (struct dfl_afu_dma_region *region , u64 iova
, u64 size );

like, she takes three things and gives you back a bool. no drama, no side effects, no cap. 🦋

🫶 ARGUMENTS 🫶

  • region — the dma memory region. this is the icon we're checking everything against. 👑
  • iova — the address of the dma memory area. the "where" of it all. ✨
  • size — the size of the dma memory area. the "how much" of it all. 📏

🌸 DESCRIPTION 🌸

so here's the tea: dma_region_check_iova compares the dma memory area defined by iova and size against the given dma region.

if the memory area is fully contained in the region → she returns true. slay. ✅

otherwise → false. and that's it, no hard feelings. 💅

the way she's literally just doing containment math and nothing else... obsessed. 🧚

ngl the word to hold onto here is fully — she's checking the whole area is inside, not just vibes-adjacent to it. 🔥

🔎 SEE ALSO 🔎

Kernel file ./drivers/fpga/dfl-afu-dma-region.c, plus her whole friend group:

go read them, iykyk. 📚💜

warning bestie: don't just guess at containment with your own arithmetic, use the function fr fr. 🙈

that's the whole page!! mwah 💋

— this little number lives in ./drivers/fpga, dated October 2026, and yes she's dma_region_check_iova(9) — periodt. 💅🌸💖

📦 where this page comes from