[Bug 214859] New: drm-amdgpu-init-iommu~fd-device-init.patch introduce bug

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214859

            Bug ID: 214859
           Summary: drm-amdgpu-init-iommu~fd-device-init.patch introduce
                    bug
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.14.15
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: towo at siduction.org
        Regression: No

After commit d60096b3b2c2..cd8cc7d31b49 100644
drm-amdgpu-init-iommu~fd-device-init.patch

Kernel 5.14.15 on most Ryzen Notebooks X cant't start really.
There is a long time, before x is starting, dmesg is spammed with failure
messages like

Okt 28 10:28:08 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 28b4 wait reg 28c6
Okt 28 10:28:21 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 1a6f4 wait reg 1a706
Okt 28 10:28:34 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 28b4 wait reg 28c6
Okt 28 10:28:47 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 1a6f4 wait reg 1a706
Okt 28 10:29:01 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 28b4 wait reg 28c6
Okt 28 10:29:14 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 1a6f4 wait reg 1a706
Okt 28 10:29:27 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 28b4 wait reg 28c6
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: failed to write
reg 1a6f4 wait reg 1a706

and/or

Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: [gfxhub0]
no-retry page fault (src_id:0 ring:128 vmid:0 pasid:0, for process  pid 0
thread  pid 0)
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:   in page
starting at address 0x0000000000872000 from IH client 0x1b (UTCL2)
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:
VM_L2_PROTECTION_FAULT_STATUS:0x00040D00
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:          Faulty
UTCL2 client ID: CPG (0x6)
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
MORE_FAULTS: 0x0
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
WALKER_ERROR: 0x0
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
PERMISSION_FAULTS: 0x0
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
MAPPING_ERROR: 0x1
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:          RW: 0x1
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu: [gfxhub0]
no-retry page fault (src_id:0 ring:128 vmid:0 pasid:0, for process  pid 0
thread  pid 0)
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:   in page
starting at address 0x0000000000872000 from IH client 0x1b (UTCL2)
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:
VM_L2_PROTECTION_FAULT_STATUS:0x00040D00
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:          Faulty
UTCL2 client ID: CPG (0x6)
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
MORE_FAULTS: 0x0
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
WALKER_ERROR: 0x0
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
PERMISSION_FAULTS: 0x0
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:         
MAPPING_ERROR: 0x1
Okt 28 10:29:40 kernel: ^[[0;1;39mamdgpu 0000:04:00.0: amdgpu:          RW: 0x1

Reverting that commit and the kernel is back working normal.
Here the related reports from our users (ignore the nvidia posts).
https://forum.siduction.org/index.php?topic=8439.0

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