afu_dma_region_find_iova(9)

📦 version 7.3.1, in nixpkgs unstable

💖 afu_dma_region_find_iova(9) — like, the whole entire vibe 💖

okay so bestie, welcome to the Kernel API Manual ✨ pull up a chair, grab a boba, because we're about to talk about finding a DMA region in an rbtree and honestly? it's giving main character energy 🎀

🌸 NAME 🌸

afu_dma_region_find_iova — ok so what it DOES is it finds the dma region from rbtree by iova 🦋 that's literally it, that's the whole job, and it does it slayfully

✨ SYNOPSIS ✨

struct dfl_afu_dma_region * afu_dma_region_find_iova (struct
dfl_feature_dev_data *fdata , u64 iova );

like, you hand it your feature dev data and an iova, and it hands you back a struct dfl_afu_dma_region * 🫶 no cap

💅 ARGUMENTS 💅

  • fdata — the feature dev data 💖 that's your context, your whole situation
  • iova — the address of the dma region 🌸 (a u64, in case you were wondering, and yes it's in the synopsis too, i'm just being thorough)

🔥 DESCRIPTION 🔥

okay so here's the thing that actually matters, and i need you to hear me on this one:

Needs to be called with fdata->lock held. 🔒

like. held. as in you already grabbed the lock before you call this, bestie 😭 this function is NOT gonna do it for you, it's not that kind of function, it's a you do the locking kind of function. so lock it up first, then call, okay? periodt 💀

🌈 SEE ALSO 🌈

the kernel file is ./drivers/fpga/dfl-afu-dma-region.c — go read it, it's iconic 👑

and then the whole friend group of related functions, all of which you can and should look up:

and that's the page, bestie 💜 shoutout to ./drivers/fpga for being the source and the whole October 2026 situation for the date — like she's from the future, we respect it 🧚‍♀️⭐ bye!! 🍓

📦 where this page comes from