amdgpu_gmc_init_pdb0(9)

📦 version 7.3.1, in nixpkgs unstable

💅 amdgpu_gmc_init_pdb0 — like, the Kernel API Manual, bestie

okay so this is amdgpu_gmc_init_pdb0(9) from the Kernel API Manual, and honestly? she's a little niche icon and I'm obsessed 🎀

✨ NAME ✨

amdgpu_gmc_init_pdb0 — initialize PDB0, that's it, that's the whole vibe 🦋

🌸 SYNOPSIS 🌸

void amdgpu_gmc_init_pdb0 (struct amdgpu_device *adev );

no cap, that's the whole signature 💅

🎀 ARGUMENTS 🎀

  • adev — an amdgpu_device pointer. she's literally the main character here 👑

🔥 DESCRIPTION 🔥

okay so listen, this function is only used when the GART page table is being used for FB address translation. like, only then, bestie, don't come for her otherwise 🙈

in that case, we construct a 2-level system VM page table: PDB0->PTB, so it covers both VRAM of the hive and system memory. two for one, ate and left no crumbs 🌈

PDB0 is static — initialized once on driver initialization, periodt. the first n entries of PDB0 get used as PTE by setting the P bit to 1, pointing to VRAM. and then the n+1'th entry points to a big PTB that covers system memory. it's giving organized. it's giving structured. it's giving iykyk ⭐

🫶 SEE ALSO 🫶

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c — go read her, she's right there 💖

cutest little sign-off ever: this page lives in ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's amdgpu_gmc_init_pdb0(9) — slay, bye, drink water 🍓🧚💜
📦 where this page comes from