[Bug 214901] amdgpu freezes HP laptop at start up

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214901

--- Comment #3 from spasswolf at web.de ---
Actually the above message is not complete:
Nov  1 00:22:49 bart kernel: [    2.136382] kfd kfd: amdgpu: Allocated 3969056
bytes on gart
Nov  1 00:22:49 bart kernel: [    2.136462] kfd kfd: amdgpu: error getting
iommu info. is the iommu enabled?
Nov  1 00:22:49 bart kernel: [    2.136470] kfd kfd: amdgpu: Error initializing
iommuv2
Nov  1 00:22:49 bart kernel: [    2.137386] kfd kfd: amdgpu: device 1002:9874
NOT added due to errors
Nov  1 00:22:49 bart kernel: [    2.137393] kfd kfd: amdgpu: Failed to resume
IOMMU for device 1002:9874
Nov  1 00:22:49 bart kernel: [    2.137397] amdgpu 0000:00:01.0: amdgpu:
amdgpu_device_ip_init failed
Nov  1 00:22:49 bart kernel: [    2.137402] amdgpu 0000:00:01.0: amdgpu: Fatal
error during GPU init
Nov  1 00:22:49 bart kernel: [    2.137406] amdgpu 0000:00:01.0: amdgpu:
amdgpu: finishing device.
Nov  1 00:22:49 bart kernel: [    2.139639] BUG: kernel NULL pointer
dereference, address: 00000000000001db
The messages from kfd have been there with older kernels, too, but were not
fatal. They are caused by the HP Laptop 15-bw0xx/8332, not having a iommu or
its BIOS not properly initializing it.
But linux-5.15 has added the following lines to the amdgpu_device_ip_init: 
        r = amdgpu_amdkfd_resume_iommu(adev);
        if (r)
                goto init_failed;
which make causes the amdgpu_device_ip_init function to fail when kfd init
fails. As a workaround one could remove these.
A BIOS update could perhaps also solve the problem but seems to require a
Windows running on the Laptop (which was actually sold without Windows)

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