cik_select_se_sh(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cik_select_se_sh — Kernel API Manual ✨

okay so bestie, welcome to the cik_select_se_sh(9) page, straight out of the Kernel API Manual 🎀. this one's a tiny little function but she's important, so grab your strawberry drink 🍓 and let's get into it.

🌸 NAME 🌸

cik_select_se_sh — she picks which SE and SH you're addressing, no cap 💅

✨ SYNOPSIS ✨

void cik_select_se_sh (struct radeon_device *rdev , u32 se_num , u32 sh_num );

that's it. that's the whole signature. she's short and she knows it 👑

🫶 ARGUMENTS 🫶

  • rdev — a radeon_device pointer. literally the device you're talking to, your main character 🖥️
  • se_num — the shader engine you wanna address. which SE, girl? pick one 💫
  • sh_num — the sh block to address. the SH in question, bestie 🧚

💖 DESCRIPTION 💖

so what she does: she selects which SE, SH combinations to address ✨. certain registers are instanced per SE or SH — like, they exist once per engine/block, iykyk — and this is how you point at the right one instead of yelling into the void 😭

and here's the iconic part: 0xffffffff means broadcast to all SEs or SHs — for CIK. that's the "hey everyone listen up" option 🔥

ngl, if you pass 0xffffffff expecting one single engine, you're gonna have a bad time — that's the broadcast value, fr fr.

🦋 SEE ALSO 🦋

the kernel file lives right here, go read her 📖:

./drivers/gpu/drm/radeon/cik.c

and the whole friend group 💜:

mwah 💋 that's the whole page. she came from ./drivers/gpu/drm/radeon, dated October 2026 — go off, queen 👑✨

📦 where this page comes from