adm_prep_slave_sg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 adm_prep_slave_sg(9) — like, the whole glow-up

okay so bestie, welcome to the Kernel API Manual ✨ this little page is all about adm_prep_slave_sg(9), and yes it's as niche as it sounds. it's a kernel function, it's in the DMA world, and it's lowkey iconic for what it does. let's get into it 💖

✨ NAME ✨

adm_prep_slave_sg — it preps a slave sg transaction. that's it, that's the whole name, no cap 🎀

🦋 SYNOPSIS 🦋

here's the signature, copy-pasted with love and zero typos, bestie:

struct dma_async_tx_descriptor * adm_prep_slave_sg (struct dma_chan
*chan , struct scatterlist *sgl , unsigned int sg_len , enum
dma_transfer_direction direction , unsigned long flags , void *context
);

the way it returns a struct dma_async_tx_descriptor *… main character energy fr fr 👑

🌸 ARGUMENTS 🌸

okay now the little cast of characters, one by one, no skipping:

  • chan — the dma channel 💫 like, the actual channel this whole thing runs on
  • sgl — the scatter gather list 🍓 yes, the list itself, the whole lineup
  • sg_len — the length of sg 📏 how long that list is being, basically
  • direction — the DMA transfer direction 🧭 it's an enum dma_transfer_direction, so it knows which way the data's going
  • flags — the DMA flags 🚩 the little unsigned long of options
  • context — transfer context, and ngl it's marked (unused) 🙈 so yeah, it's there, it's invited to the party, it just doesn't dance
no cap, context is literally listed as unused in the original — so don't come for me, I'm just the messenger 💀

🫶 SEE ALSO 🫶

bestie, this is the friend group 👯‍♀️ the kernel file is ./drivers/dma/qcom/qcom_adm.c and here's everyone else in the circle:

go read them all, i'll wait 💜

🌈 sign-off 🌈

this page lives under ./drivers/dma/qcom in the Kernel API Manual, and it's dated October 2026 ⭐ that's the version, that's the date, and honestly? she ate. periodt 💅✨

you're now officially caught up on adm_prep_slave_sg(9) — go forth and prep those slave sg transactions, queen 👑🦋💖

📦 where this page comes from