Bug 97403

4.9-wip branch should have proper DPM support for Iceland. However, this doesn't seem to work. I can't manually force "high" performance by issuing:

# echo high > /sys/class/drm/card1/device/power_dpm_force_performance_level 
bash: echo: write error: Invalid argument

dmesg has one weird note, and that is:

[   20.998755] VI should always have 2 performance levels

Full dmesg output related to amdgpu:

[   15.084442] [drm] amdgpu kernel modesetting enabled.
[   15.084452] vga_switcheroo: detected switching method \_SB_.PCI0.GFX0.ATPX handle
[   15.084530] ATPX version 1, functions 0x00000003
[   15.084576] ATPX Hybrid Graphics
[   15.391373] CRAT table not found
[   15.391375] Finished initializing topology ret=0
[   15.391388] kfd kfd: Initialized module
[   15.391676] amdgpu 0000:01:00.0: enabling device (0006 -> 0007)
[   15.391869] [drm] initializing kernel modesetting (TOPAZ 0x1002:0x6900 0x103C:0x811C 0x83).
[   15.391879] [drm] register mmio base: 0xE2000000
[   15.391879] [drm] register mmio size: 262144
[   15.391883] [drm] doorbell mmio base: 0xE0000000
[   15.391884] [drm] doorbell mmio size: 2097152
[   15.391891] [drm] probing gen 2 caps for device 8086:9d10 = 1724843/e
[   15.391892] [drm] probing mlw for device 8086:9d10 = 1724843
[   15.391903] vga_switcheroo: enabled
[   15.395046] ATOM BIOS: HP/Quanta
[   15.395060] [drm] GPU not posted. posting now...
[   15.398467] [drm] Changing default dispclk from 0Mhz to 600Mhz
[   15.450307] iwlwifi 0000:03:00.0: loaded firmware version 22.361476.0 op_mode iwlmvm
[   15.549634] [TTM] Zone  kernel: Available graphics memory: 4027938 kiB
[   15.549636] [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
[   15.549637] [TTM] Initializing pool allocator
[   15.549640] [TTM] Initializing DMA pool allocator
[   15.549655] amdgpu 0000:01:00.0: VRAM: 2048M 0x0000000000000000 - 0x000000007FFFFFFF (2048M used)
[   15.549657] amdgpu 0000:01:00.0: GTT: 3933M 0x0000000080000000 - 0x0000000175D887FF
[   15.549658] [drm] Detected VRAM RAM=2048M, BAR=256M
[   15.549659] [drm] RAM width 64bits DDR3
[   15.549669] [drm] amdgpu: 2048M of VRAM memory ready
[   15.549669] [drm] amdgpu: 3933M of GTT memory ready.
[   15.549681] [drm] GART: num cpu pages 1006984, num gpu pages 1006984
[   15.550554] [drm] PCIE GART of 3933M enabled (table at 0x0000000000040000).
[   15.550580] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   15.550580] [drm] Driver supports precise vblank timestamp query.
[   15.550614] amdgpu 0000:01:00.0: amdgpu: using MSI.
[   15.550639] [drm] amdgpu: irq initialized.
[   15.559808] amdgpu: powerplay initialized
[   15.686674] amdgpu 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000080000010, cpu addr 0xffff880231108010
[   15.686788] amdgpu 0000:01:00.0: fence driver on ring 1 use gpu addr 0x0000000080000020, cpu addr 0xffff880231108020
[   15.686831] amdgpu 0000:01:00.0: fence driver on ring 2 use gpu addr 0x0000000080000030, cpu addr 0xffff880231108030
[   15.686863] amdgpu 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000080000040, cpu addr 0xffff880231108040
[   15.686881] amdgpu 0000:01:00.0: fence driver on ring 4 use gpu addr 0x0000000080000050, cpu addr 0xffff880231108050
[   15.686897] amdgpu 0000:01:00.0: fence driver on ring 5 use gpu addr 0x0000000080000060, cpu addr 0xffff880231108060
[   15.686915] amdgpu 0000:01:00.0: fence driver on ring 6 use gpu addr 0x0000000080000070, cpu addr 0xffff880231108070
[   15.686930] amdgpu 0000:01:00.0: fence driver on ring 7 use gpu addr 0x0000000080000080, cpu addr 0xffff880231108080
[   15.686947] amdgpu 0000:01:00.0: fence driver on ring 8 use gpu addr 0x0000000080000090, cpu addr 0xffff880231108090
[   15.773983] amdgpu 0000:01:00.0: fence driver on ring 9 use gpu addr 0x00000000800000a0, cpu addr 0xffff8802311080a0
[   15.774017] amdgpu 0000:01:00.0: fence driver on ring 10 use gpu addr 0x00000000800000b0, cpu addr 0xffff8802311080b0
[   15.835172] [drm] ring test on 0 succeeded in 10 usecs
[   15.835361] [drm] ring test on 1 succeeded in 14 usecs
[   15.835383] [drm] ring test on 2 succeeded in 11 usecs
[   15.835389] [drm] ring test on 3 succeeded in 2 usecs
[   15.835392] [drm] ring test on 4 succeeded in 1 usecs
[   15.835397] [drm] ring test on 5 succeeded in 2 usecs
[   15.835403] [drm] ring test on 6 succeeded in 2 usecs
[   15.835408] [drm] ring test on 7 succeeded in 2 usecs
[   15.835411] [drm] ring test on 8 succeeded in 1 usecs
[   15.835445] [drm] ring test on 9 succeeded in 4 usecs
[   15.835449] [drm] ring test on 10 succeeded in 3 usecs
[   15.835649] [drm] ib test on ring 0 succeeded
[   15.835829] [drm] ib test on ring 1 succeeded
[   15.835939] [drm] ib test on ring 2 succeeded
[   15.836043] [drm] ib test on ring 3 succeeded
[   15.836153] [drm] ib test on ring 4 succeeded
[   15.836256] [drm] ib test on ring 5 succeeded
[   15.836274] [drm] ib test on ring 6 succeeded
[   15.836291] [drm] ib test on ring 7 succeeded
[   15.836307] [drm] ib test on ring 8 succeeded
[   15.836321] [drm] ib test on ring 9 succeeded
[   15.836333] [drm] ib test on ring 10 succeeded
[   15.838598] [drm] Initialized amdgpu 3.3.0 20150101 for 0000:01:00.0 on minor 1
[   20.998755] VI should always have 2 performance levels

Contents of various pp_* files from /sys/class/drm/card1/device

# cat power_dpm_force_performance_level 
off

# cat power_dpm_state 
performance

# cat pp_cur_state 
0

# cat pp_dpm_mclk 
0: 300Mhz 
1: 600Mhz 
2: 1000Mhz

# cat pp_dpm_pcie
0: 2.5GB, x8 
1: 2.5GB, x8 
2: 8.0GB, x16 
3: 8.0GB, x16 
4: 8.0GB, x16 
5: 8.0GB, x16

# cat pp_dpm_sclk
0: 300Mhz 
1: 551Mhz 
2: 678Mhz 
3: 754Mhz 
4: 810Mhz 
5: 867Mhz 
6: 943Mhz 
7: 1021Mhz

# cat pp_force_state
(empty, not the actual output)

# cat pp_mclk_od
0

# cat pp_num_states
states: 3
0 boot
1 performance
2 battery

# cat pp_sclk_od
0