DFL_FPGA_FME_ERR_SET_IRQ(9)

📦 version 7.3.1, in nixpkgs unstable

💅 DFL_FPGA_FME_ERR_SET_IRQ(9) — like, the FME error-irq one 🦋

okay bestie so real talk: this is a page out of the Kernel API Manual, section 9, and the whole main character of it is an ioctl called DFL_FPGA_FME_ERR_SET_IRQ. she's not a function, she's not a syscall, she's an ioctl request code, and yes she's iconic for it. periodt ✨

🌸 NAME 🌸

DFL_FPGA_FME_ERR_SET_IRQ — and like, the manpage literally spells out the whole code for you too, so you know exactly what you're getting:

_IOW(DFL_FPGA_MAGIC, DFL_FME_BASE + 4, struct dfl_fpga_irq_set)

that's the whole vibe right there — magic number DFL_FPGA_MAGIC, offset DFL_FME_BASE + 4, and the payload struct is struct dfl_fpga_irq_set. no cap. 🎀

✨ SYNOPSIS ✨

DFL_FPGA_FME_ERR_SET_IRQ

that's it. that's the whole synopsis. she ate and left no crumbs 💅

🦋 DESCRIPTION 🦋

so here's the tea 🍓 — this ioctl handles the interrupt trigger for fpga fme error reporting, and it's honestly giving "do two opposite things depending on what you pass me":

  • if evtfds[n] is valid, it sets the related interrupt trigger 🔥
  • if evtfds[n] is a negative value, it unsets the related interrupt trigger 🙈

so like, same call, opposite direction, depending on the value. lowkey elegant, highkey chaotic, we love her for it. 💜

⭐ RETURN ⭐

  • 0 on success — slay 💖
  • -errno on failure — not slay, but at least she tells you why 😭

🌈 SEE ALSO 🌈

the kernel file lives at ./include/uapi/linux/fpga-dfl.h — go read it, iykyk 👑

and she runs with a whole friend group, fr fr:

🫶 little reminder bestie: this whole page is sourced from ./include/uapi/linux, dated October 2026, and it's filed under DFL_FPGA_FME_ERR_SET_IRQ(9). that's the sign-off, mwah 💋🧚‍♀️
📦 where this page comes from