sba_free(9)

📦 version 7.3.1, in nixpkgs unstable

💅 sba_free(9) — free/unmap shared mem for DMA

okay so bestie, welcome to the Kernel API Manual 🎀 — this page is literally all about sba_free, and by the end you're gonna know it like the back of your hand. no cap.

✨ NAME ✨

sba_free — free/unmap shared mem for DMA 🦋

🌸 SYNOPSIS 🌸

void sba_free (struct device *hwdev , size_t size , void *vaddr ,
       dma_addr_t dma_handle , unsigned long attrs );

that's the whole signature, copy it exactly, do not freestyle it 🙈

💖 ARGUMENTS 💖

  • hwdev — an instance of PCI owned by the driver that's asking. it's giving "whose buffer is this anyway" energy 👑
  • size — the number of bytes mapped in the driver buffer. yes, actual bytes, count them 🔥
  • vaddr — the virtual address IOVA of the "consistent" buffer. quote-unquote consistent, they said it not me 💅
  • dma_handle — the IO virtual address of the "consistent" buffer. don't mix it up with vaddr, they're different besties 😭
  • attrs — attributes. that's it, that's the description. iconic minimalism ✨

🦋 DESCRIPTION 🦋

for the full lore, go read Documentation/core-api/dma-api-howto.rst — that's literally where the details live, told you exactly where to look 💜

⭐ SEE ALSO ⭐

kernel file ./drivers/parisc/sba_iommu.c plus this whole friend group, like a group chat of its own 🫶

ngl, the description here is short on purpose — this page is a pointer to the docs, not the docs themselves. no invented tips, i would never 💀

and that's the whole thing bestie, mwah 🍓 this page lives in ./drivers/parisc, dated October 2026, and it's sba_free(9) through and through — go forth and free that DMA memory 💅✨🌈

📦 where this page comes from