[Bug 107518] polaris powerplay init fails: There must be 1 or more PCIE levels defined in PPTable

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=107518

--- Comment #11 from Luigi Laurini <moonlght@tiscali.it> ---
Same bug present in amd64 architecture under kvm guest with RX 480 passed
through.
The first time i boot the guest the performance are ok, but if i reboot the
guest without rebooting the host, the messages appears.


Tried the patch 

https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=8242308cc3c4419832126ab78ca409ce7110ab33

The message are gone but the performance problem is still present.

the problem affects the memory/gpu clocking:

First boot of the guest:

cat /sys/kernel/debug/dri/0/amdgpu_pm_info 
Clock Gating Flags Mask: 0x37bcf
        Graphics Medium Grain Clock Gating: On
        Graphics Medium Grain memory Light Sleep: On
        Graphics Coarse Grain Clock Gating: On
        Graphics Coarse Grain memory Light Sleep: On
        Graphics Coarse Grain Tree Shader Clock Gating: Off
        Graphics Coarse Grain Tree Shader Light Sleep: Off
        Graphics Command Processor Light Sleep: On
        Graphics Run List Controller Light Sleep: On
        Graphics 3D Coarse Grain Clock Gating: Off
        Graphics 3D Coarse Grain memory Light Sleep: Off
        Memory Controller Light Sleep: On
        Memory Controller Medium Grain Clock Gating: On
        System Direct Memory Access Light Sleep: Off
        System Direct Memory Access Medium Grain Clock Gating: On
        Bus Interface Medium Grain Clock Gating: Off
        Bus Interface Light Sleep: On
        Unified Video Decoder Medium Grain Clock Gating: On
        Video Compression Engine Medium Grain Clock Gating: On
        Host Data Path Light Sleep: Off
        Host Data Path Medium Grain Clock Gating: On
        Digital Right Management Medium Grain Clock Gating: Off
        Digital Right Management Light Sleep: Off
        Rom Medium Grain Clock Gating: On
        Data Fabric Medium Grain Clock Gating: Off

GFX Clocks and Power:
        1750 MHz (MCLK)
        330 MHz (SCLK)
        300 MHz (PSTATE_SCLK)
        300 MHz (PSTATE_MCLK)
        1000 mV (VDDGFX)
        19.127 W (average GPU)

GPU Temperature: 56 C
GPU Load: 0 %

UVD: Disabled

VCE: Disabled

if i reboot the guest:

cat /sys/kernel/debug/dri/0/amdgpu_pm_info
Clock Gating Flags Mask: 0x37bcf
        Graphics Medium Grain Clock Gating: On
        Graphics Medium Grain memory Light Sleep: On
        Graphics Coarse Grain Clock Gating: On
        Graphics Coarse Grain memory Light Sleep: On
        Graphics Coarse Grain Tree Shader Clock Gating: Off
        Graphics Coarse Grain Tree Shader Light Sleep: Off
        Graphics Command Processor Light Sleep: On
        Graphics Run List Controller Light Sleep: On
        Graphics 3D Coarse Grain Clock Gating: Off
        Graphics 3D Coarse Grain memory Light Sleep: Off
        Memory Controller Light Sleep: On
        Memory Controller Medium Grain Clock Gating: On
        System Direct Memory Access Light Sleep: Off
        System Direct Memory Access Medium Grain Clock Gating: On
        Bus Interface Medium Grain Clock Gating: Off
        Bus Interface Light Sleep: On
        Unified Video Decoder Medium Grain Clock Gating: On
        Video Compression Engine Medium Grain Clock Gating: On
        Host Data Path Light Sleep: Off
        Host Data Path Medium Grain Clock Gating: On
        Digital Right Management Medium Grain Clock Gating: Off
        Digital Right Management Light Sleep: Off
        Rom Medium Grain Clock Gating: On
        Data Fabric Medium Grain Clock Gating: Off

GFX Clocks and Power:
        300 MHz (MCLK)
        300 MHz (SCLK)
        300 MHz (PSTATE_SCLK)
        300 MHz (PSTATE_MCLK)
        800 mV (VDDGFX)
        7.162 W (average GPU)

GPU Temperature: 42 C
GPU Load: 0 %

UVD: Disabled

VCE: Disabled

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