[Bug 86864] [rv6xx] RADEON_FLAG_GTT_WC causes GPU to reset when playing Second Life / other games

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Comment # 5 on bug 86864 from
Taking some suggestions to disable CP DMA: (R600_DEBUG=nocpdma):

GPU crashed hard:

[  540.397058] radeon 0000:01:00.0: ring 0 stalled for more than 10066msec
[  540.403687] radeon 0000:01:00.0: GPU lockup (waiting for 0x000000000001ddb1
last fence id 0x000000000001ddb0 on ring 0)
[  540.413226] radeon 0000:01:00.0: failed to get a new IB (-35)
[  540.419088] [drm:radeon_cs_ib_fill] *ERROR* Failed to get ib !
[  540.642386] radeon 0000:01:00.0: Saved 537 dwords of commands on ring 0.
[  540.648841] radeon 0000:01:00.0: GPU softreset: 0x00000008
[  540.654444] radeon 0000:01:00.0:   R_008010_GRBM_STATUS      = 0xA0000030
[  540.661829] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2     = 0x00000003
[  540.667683] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS      = 0x200000C0
[  540.674041] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  540.680737] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
[  540.687094] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00020186
[  540.693250] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80028645
[  540.697631] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  540.751932] radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00004001
[  540.754222] radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00000100
[  540.759528] radeon 0000:01:00.0:   R_008010_GRBM_STATUS      = 0xA0003030
[  540.761834] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2     = 0x00000003
[  540.763420] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS      = 0x200080C0
[  540.765966] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  540.768397] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
[  540.770988] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00000000
[  540.773460] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80100000
[  540.777015] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  540.778511] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
[  540.784272] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[  540.786484] radeon 0000:01:00.0: WB enabled
[  540.788382] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000020000c00 and cpu addr 0xffff88003603ec00
[  540.823636] [drm] ring test on 0 succeeded in 1 usecs
[  550.825064] radeon 0000:01:00.0: ring 0 stalled for more than 10000msec
[  550.830843] radeon 0000:01:00.0: GPU lockup (waiting for 0x000000000001ddc2
last fence id 0x000000000001ddb1 on ring 0)
[  550.841797] [drm:r600_ib_test] *ERROR* radeon: fence wait failed (-35).
[  550.847294] [drm:radeon_ib_ring_tests] *ERROR* radeon: failed testing IB on
GFX ring (-35).
[  550.854825] radeon 0000:01:00.0: ib ring test failed (-35).
[  551.074568] radeon 0000:01:00.0: GPU softreset: 0x00000009
[  551.080710] radeon 0000:01:00.0:   R_008010_GRBM_STATUS      = 0xA2733030
[  551.087107] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2     = 0x00000103
[  551.093704] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS      = 0x200000C0
[  551.100378] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  551.106751] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00008002
[  551.112612] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00008086
[  551.119845] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80018645
[  551.125381] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  551.182032] radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00007FEF
[  551.187907] radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00000100
[  551.194887] radeon 0000:01:00.0:   R_008010_GRBM_STATUS      = 0xA0003030
[  551.202106] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2     = 0x00000003
[  551.208302] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS      = 0x200080C0
[  551.214418] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  551.221656] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
[  551.227603] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00000000
[  551.233900] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80100000
[  551.241368] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  551.247877] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
[  551.256336] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[  551.261595] radeon 0000:01:00.0: WB enabled
[  551.265559] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000020000c00 and cpu addr 0xffff88003603ec00
[  551.305998] [drm] ring test on 0 succeeded in 1 usecs
[  551.310130] [drm] ib test on ring 0 succeeded in 0 usecs
[  551.315154] switching from power state:
[  551.318241]  ui class: none
[  551.320942]  internal class: boot 
[  551.324177]  caps: video 
[  551.326370]  uvd    vclk: 0 dclk: 0
[  551.329313]          power level 0    sclk: 60000 mclk: 70000 vddc: 1100
[  551.334239]          power level 1    sclk: 60000 mclk: 70000 vddc: 1100
[  551.340383]          power level 2    sclk: 60000 mclk: 70000 vddc: 1100
[  551.345543]  status: c b 
[  551.348176] switching to power state:
[  551.351659]  ui class: performance
[  551.354237]  internal class: none
[  551.358272]  caps: single_disp video 
[  551.361736]  uvd    vclk: 0 dclk: 0
[  551.364876]          power level 0    sclk: 11000 mclk: 40500 vddc: 900
[  551.369971]          power level 1    sclk: 30000 mclk: 70000 vddc: 1100
[  551.375776]          power level 2    sclk: 60000 mclk: 70000 vddc: 1100
[  551.381047]  status: r 
[  562.318061] radeon 0000:01:00.0: ring 0 stalled for more than 10048msec
[  562.325126] radeon 0000:01:00.0: GPU lockup (waiting for 0x000000000001ddd0
last fence id 0x000000000001ddcf on ring 0)
[  562.335405] retire_capture_urb: 4 callbacks suppressed
[  562.339810] radeon 0000:01:00.0: failed to get a new IB (-35)
[  562.345503] [drm:radeon_cs_ib_fill] *ERROR* Failed to get ib !
[  562.567926] NMI: PCI system error (SERR) for reason a1 on CPU 0.
[  562.568803] Dazed and confused, but trying to continue
[  562.578130] radeon 0000:01:00.0: Saved 537 dwords of commands on ring 0.
[  562.583853] radeon 0000:01:00.0: GPU softreset: 0x00000009
[  562.589369] radeon 0000:01:00.0:   R_008010_GRBM_STATUS      = 0xA2733830
[  562.595914] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2     = 0x00000103
[  562.600921] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS      = 0x200010C0
[  562.607704] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  562.613598] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00008000
[  562.620112] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00008806
[  562.626883] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x800106C5
[  562.633039] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  562.882450] radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00007FEF
[  562.888905] radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00000100
[  562.896025] radeon 0000:01:00.0:   R_008010_GRBM_STATUS      = 0xA0003030
[  562.902355] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2     = 0x00000003
[  562.908844] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS      = 0x200090C0
[  562.915298] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[  562.921101] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
[  562.928340] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00000000
[  562.934049] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80100000
[  562.940499] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[  562.946972] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
[  563.124312] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[  563.129580] radeon 0000:01:00.0: WB enabled
[  563.133126] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000020000c00 and cpu addr 0xffff88003603ec00
[  563.345369] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed
(scratch(0x8504)=0xCAFEDEAD)
[  563.353039] [drm:r600_resume] *ERROR* r600 startup failed on resume
[  563.358920] switching from power state:
[  563.363823]  ui class: none
[  563.366549]  internal class: boot 
[  563.369190]  caps: video 
[  563.371732]  uvd    vclk: 0 dclk: 0
[  563.374927]          power level 0    sclk: 60000 mclk: 70000 vddc: 1100
[  563.381397]          power level 1    sclk: 60000 mclk: 70000 vddc: 1100
[  563.387026]          power level 2    sclk: 60000 mclk: 70000 vddc: 1100
[  563.393153]  status: c b 
[  563.396783] switching to power state:
[  563.400357]  ui class: performance
[  563.403811]  internal class: none
[  563.406935]  caps: single_disp video 
[  563.411205]  uvd    vclk: 0 dclk: 0
[  563.413805]          power level 0    sclk: 11000 mclk: 40500 vddc: 900
[  563.420862]          power level 1    sclk: 30000 mclk: 70000 vddc: 1100
[  563.423187]          power level 2    sclk: 60000 mclk: 70000 vddc: 1100
[  563.425557]  status: r


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