pvr_kccb_reserve_slot(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pvr_kccb_reserve_slot(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ this one's a kernel-level baddie from the PowerVR corner of the DRM universe, and she's here to reserve things. let's get into it 🎀

🌸 NAME 🌸

pvr_kccb_reserve_slot — Reserve a KCCB slot for later use 🫶 (yes, later. she's a planner. main character energy fr.)

✨ SYNOPSIS ✨

struct dma_fence * pvr_kccb_reserve_slot (struct pvr_device *pvr_dev ,
struct dma_fence * f );

that's the whole signature, no cap. two args, one fence pointer coming back out 💖

🦋 ARGUMENTS 🦋

  • pvr_dev — Target PowerVR device 🔥 this is the device you're working with, the whole vibe of the operation.
  • f — KCCB fence object previously allocated with pvr_kccb_fence_alloc ⭐ important: it's gotta be previously allocated by that function, like you can't just show up with any old fence, iykyk.

💜 DESCRIPTION 💜

so the whole deal: she tries to reserve a KCCB slot, and if there's, like, no slot available, she initializes the fence object and queues it to the waiters list. that's the fallback plan and honestly it's giving "we'll call you" but in a nice way 🧚

⚠️ biggest thing to remember: if NULL is returned, that means the slot is reserved. in that case, f is freed and shouldn't be accessed after that point — like, don't touch it, don't look at it, don't text it back. it's gone, bestie 😭💀

🌈 RETURN 🌈

  • NULL if a slot was available directly ✨ (and remember — that means the slot is reserved, and f is freed!)
  • A valid dma_fence object to wait on if no slot was available 🎀 so you just... wait. on the fence. iconic behaviour honestly.

👑 SEE ALSO 👑

Kernel file ./drivers/gpu/drm/imagination/pvr_ccb.c — and the whole friend group 🫶:

and that's the page, bestie 🎀 this lil manual lives over in ./drivers/gpu/drm/imagination, dated October 2026 — so yeah, she's from the future, slay 💅✨

📦 where this page comes from