amdgpu_device_halt(9)

📦 version 7.3.1, in nixpkgs unstable

💅 amdgpu_device_halt(9)

okay so this is a page from the Kernel API Manual, and honestly? it's giving "emergency brake for your GPU" energy. buckle up bestie 🎀

✨ NAME ✨

amdgpu_device_halt — bring hardware to some kind of halt state 🛑

✨ SYNOPSIS ✨

void amdgpu_device_halt (struct amdgpu_device *adev );

✨ ARGUMENTS ✨

  • adev — an amdgpu_device pointer, aka your lil handle to the GPU we're about to put in time-out 🫶

✨ DESCRIPTION ✨

So the whole vibe here: we bring the hardware to some kind of halt state so that no one can touch it any more. literally nobody. hands off. 🙈 It helps maintain the error context when an error has occurred — like preserving the crime scene, iykyk 🔍.

Compared to a simple hang, the system will keep stable at least for SSH access, which is the whole point — then it should be trivial to inspect the hardware state and see what's going on. main character debugging energy fr fr 💅

It's implemented as the following steps, in order:

  1. drm_dev_unplug makes device inaccessible to user space (IOCTLs, etc), clears all CPU mappings to device, disallows remappings through page faults — so user space is officially uninvited to the party 🚫
  2. amdgpu_irq_disable_all disables all interrupts — no more surprise knocks at the door 🔕
  3. amdgpu_fence_driver_hw_fini signals all HW fences — everyone gets the memo 🏁
  4. set adev->no_hw_access to avoid potential crashes after step 5 — important!! this is the safety goggles moment 🥽
  5. amdgpu_device_unmap_mmio clears all MMIO mappings 🗺️
  6. pci_disable_device and pci_wait_for_pending_transaction flush any in flight DMA operations — clean exit, no loose ends ✨
bestie pls note: step 4 has to happen before step 5, that's literally why it's there — adev->no_hw_access keeps things from crashing after the MMIO mappings get cleared 😭

✨ SEE ALSO ✨

Kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

and the whole friend group 👑:

that's the whole page bestie, slay 💖 this one lives in ./drivers/gpu/drm/amd/amdgpu, dated October 2026, and it's page amdgpu_device_halt(9) — go read it again if you forgot anything, no cap 🦋✨

📦 where this page comes from