AMDGPU XGMI SUPPORT(9)

💖 AMDGPU XGMI Support 💖

okay so this is the Kernel API Manual page for AMDGPU XGMI Support(9) — and bestie, it’s giving “GPUs holding hands in a shared memory hive” energy. 🐝✨

XGMI is a high speed interconnect that joins multiple GPU cards into a homogeneous memory space. That space is organized by a collective hive ID and individual node IDs, and both of those are 64-bit numbers. no cap. 🔥

The file xgmi_device_id contains the unique per GPU device ID, and it lives in the /sys/class/drm/card${cardno}/device/ directory. 🎀

Inside the device directory there’s a sub-directory called 'xgmi_hive_info' — it gets created and contains the hive ID plus the list of nodes. 💅

The hive ID is stored in: /sys/class/drm/card${cardno}/device/xgmi_hive_info/xgmi_hive_id

The node info is stored in numbered directories: /sys/class/drm/card${cardno}/device/xgmi_hive_info/node${nodeno}/xgmi_device_id

Each device has their own xgmi_hive_info direction — yes, the original literally says “direction” 😭 — with a mirror set of node sub-directories. 🪞

The XGMI memory space is built by contiguously adding the power of two padded VRAM space from each node to each other. periodt. 🧚

👀 SEE ALSO 👀

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c — go read it, iykyk. 📚💖

mwah 💋 this cutie came from ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it’s the AMDGPU XGMI Support(9) manual page. slay. 🌈👑