panthor_fw_a...ue_iface_mem(9)

📦 version 7.3.1, in nixpkgs unstable

💖 NAME 💖

panthor_fw_alloc_queue_iface_mem — bestie, this one allocates a ring-buffer interfaces ✨ (yes that's the official job description and honestly? slay.)

It lives in the Kernel API Manual, section 9 — so it's a kernel-internals girlie, not your everyday userland command. iykyk 💅

🦋 SYNOPSIS 🦋

struct panthor_kernel_bo * panthor_fw_alloc_queue_iface_mem (struct
panthor_device *ptdev , struct panthor_fw_ringbuf_input_iface **input ,
const struct panthor_fw_ringbuf_output_iface **output , u32 *input_fw_va
, u32 *output_fw_va );

Four args, one return type, zero chill. Let's go through them one by one 🔥

🎀 ARGUMENTS 🎀

  • ptdev — the Device. The whole main character. Everything else is just a pointer into its world 👑
  • input — a Pointer holding the input interface on success. On failure? Should be ignored. like, do not touch, do not perceive, do not speak of it 🙈
  • output — same deal: a Pointer holding the output interface on success, and ignored on failure. fr fr, ignore it.
  • input_fw_va — a Pointer holding the input interface FW VA on success. Should be ignored on failure 💀
  • output_fw_va — a Pointer holding the output interface FW VA on success. Should be ignored on failure 🫶
⚠️ Notice how every single one of those says "should be ignored on failure"? That's not a suggestion, bestie. If the call fails, those pointers are not yours to read. Periodt.

✨ DESCRIPTION ✨

Okay so picture this: the function allocates panthor_fw_ringbuf_{input,out}_iface interfaces. Cute, right? And the layout is extremely specific:

  • The input interface sits at offset 0.
  • The output interface sits at offset 4096.

That's it. That's the whole vibe. Two interfaces, one allocation, offsets locked in like a group chat with read receipts on 💖

🌈 RETURN 🌈

  • A valid pointer — in case of success 🎉
  • an ERR_PTR — otherwise 😭
🚨 And yes, if you got an ERR_PTR back, you know the drill: don't dereference it, IS_ERR() it first. The input, output, input_fw_va and output_fw_va pointers from the previous section are all still in "ignore me" mode.

🌸 SEE ALSO 🌸

Kernel file ./drivers/gpu/drm/panthor/panthor_fw.c — that's the source, go read it, it's giving lore ✨

And the whole friend group:

And that's the whole page, bestie 💜 This little gem comes to you courtesy of ./drivers/gpu/drm/panthor, dated October 2026 — like, she's from the future and she's still allocating ring-buffer interfaces. Obsessed. 🎀✨

📦 where this page comes from