DFL_FPGA_PORT_RESET(9)

📦 version 7.3.1, in nixpkgs unstable

💅 DFL_FPGA_PORT_RESET(9) — the kernel API manual, bestie edition 🎀

Okay so this is a page straight out of the Kernel API Manual (section 9, the grown-up kernel-space one, iykyk) and it's all about DFL_FPGA_PORT_RESET — a little ioctl that hits the reset button on your FPGA port. Buckle up, it's short and iconic. ✨

🌸 NAME 🌸

DFL_FPGA_PORT_RESET — literally just _IO(DFL_FPGA_MAGIC, DFL_PORT_BASE + 0). That's the whole vibe. A magic number and an offset, no cap. 💅

✨ SYNOPSIS ✨

DFL_FPGA_PORT_RESET

That's it. No args, no drama, no notes. 🫶

🦋 DESCRIPTION 🦋

So what does it do? It resets the FPGA Port and its AFU. That's the whole thing. Periodt.

No parameters are supported — zero, zip, nada. Don't try to sneak any in. 🙈

Here's the tea though: userspace can do a Port reset at any time, like during DMA or PR (yes, mid-operation, main character energy fr fr). But — and this is the important part, bestie — it should never cause any system level issue. It only causes functional failure (for example: a DMA or PR operation failure), and that failure is recoverable. So it's giving "chaotic but not actually destructive." 💀➡️💖

🔥 RETURN 🔥

  • 0 — slay, you succeeded ✨
  • -errno — it failed, and the error code tells you why 😭

👑 SEE ALSO 👑

Go read the kernel file ./include/uapi/linux/fpga-dfl.h — that's where the receipts live. And then go stan these other pages too:

A whole friend group of FPGA ioctls, honestly. Obsessed. 🧚💜

Heads up bestie: resetting mid-DMA or mid-PR is allowed, but expect the operation in flight to fail. It's recoverable, it's not a system-level apocalypse — but plan accordingly. 🍓

Sign-off szn 🌈⭐ — this page came to you from ./include/uapi/linux, stamped October 2026, and it's the DFL_FPGA_PORT_RESET(9) page in the Kernel API Manual. Go forth and reset responsibly, mwah 💋🫶

📦 where this page comes from