Am 06.08.20 um 17:28 schrieb Christian König:
> My best guess is that you are facing two separate bugs here.
>
> Crash #1 is somehow related to CRTCs and might even be cause by the
> atomic-helper change you noted below.
>
> Crash #2 is caused because vmw_bo_create_and_populate() tries to
> manually populate a BO object instead of relying on TTM to do it when
> necessary. This indeed doesn't work any more because of "drm/ttm: make
> TT creation purely optional v3".
>
> Question is why vmwgfx is doing this?
Not really sure unfortunately, it's possible vmwgfx is doing it because
ttm lacked some capabilities at some point? Trying to figure this one out...
Roland
>
> Regards,
> Christian.
>
> Am 06.08.20 um 16:55 schrieb Tetsuo Handa:
>> Hello.
>>
>> Commit 2ddef17678bc2ea1 ("drm/ttm: make TT creation purely optional
>> v3") broke vmwgfx .
>>
>> At first I suspected it is "drm/atomic-helper: reset vblank on crtc
>> reset" or around that,
>> but bisection said it is not. I have no idea what is going on. Please
>> have a look.
>>
>> --- Crash pattern 1 ---
>>
>> [ 0.990745][ T1] Linux agpgart interface v0.103
>> [ 0.991945][ T1] [drm] DMA map mode: Caching DMA mappings.
>> [ 0.993009][ T1] [drm] Capabilities:
>> [ 0.993972][ T1] [drm] Rect copy.
>> [ 0.994011][ T1] [drm] Cursor.
>> [ 0.994049][ T1] [drm] Cursor bypass.
>> [ 0.994984][ T1] [drm] Cursor bypass 2.
>> [ 0.995972][ T1] [drm] 8bit emulation.
>> [ 0.997057][ T1] [drm] Alpha cursor.
>> [ 0.997906][ T1] [drm] 3D.
>> [ 0.998947][ T1] [drm] Extended Fifo.
>> [ 0.999972][ T1] [drm] Multimon.
>> [ 1.000011][ T1] [drm] Pitchlock.
>> [ 1.000932][ T1] [drm] Irq mask.
>> [ 1.001972][ T1] [drm] Display Topology.
>> [ 1.002906][ T1] [drm] GMR.
>> [ 1.003906][ T1] [drm] Traces.
>> [ 1.004975][ T1] [drm] GMR2.
>> [ 1.005987][ T1] [drm] Screen Object 2.
>> [ 1.006983][ T1] [drm] Command Buffers.
>> [ 1.007981][ T1] [drm] Command Buffers 2.
>> [ 1.008020][ T1] [drm] Guest Backed Resources.
>> [ 1.008982][ T1] [drm] DX Features.
>> [ 1.009965][ T1] [drm] HP Command Queue.
>> [ 1.010982][ T1] [drm] Capabilities2:
>> [ 1.011982][ T1] [drm] Grow oTable.
>> [ 1.012020][ T1] [drm] IntraSurface copy.
>> [ 1.012983][ T1] [drm] Max GMR ids is 64
>> [ 1.013975][ T1] [drm] Max number of GMR pages is 65536
>> [ 1.015968][ T1] [drm] Max dedicated hypervisor surface memory
>> is 0 kiB
>> [ 1.017983][ T1] [drm] Maximum display memory size is 262144 kiB
>> [ 1.018982][ T1] [drm] VRAM at 0xe8000000 size is 4096 kiB
>> [ 1.019972][ T1] [drm] MMIO at 0xfe000000 size is 256 kiB
>> [ 1.021466][ T1] [TTM] Zone kernel: Available graphics memory:
>> 1880776 KiB
>> [ 1.022965][ T1] [TTM] Initializing pool allocator
>> [ 1.023975][ T1] [TTM] Initializing DMA pool allocator
>> [ 1.026297][ T1] BUG: kernel NULL pointer dereference, address:
>> 0000000000000190
>> [ 1.027257][ T1] #PF: supervisor read access in kernel mode
>> [ 1.027257][ T1] #PF: error_code(0x0000) - not-present page
>> [ 1.027257][ T1] PGD 0 P4D 0
>> [ 1.027257][ T1] Oops: 0000 [#1] SMP
>> [ 1.027257][ T1] CPU: 3 PID: 1 Comm: swapper/0 Not tainted
>> 5.8.0-rc2+ #779
>> [ 1.027257][ T1] Hardware name: VMware, Inc. VMware Virtual
>> Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020
>> [ 1.027257][ T1] RIP: 0010:drm_dev_has_vblank+0x0/0x10
>> [ 1.027257][ T1] Code: 84 2f ff ff ff e9 10 ff ff ff 89 f1 44 89
>> ff 45 31 d2 d3 e7 89 f9 e9 f7 fe ff ff cc cc cc cc cc cc cc cc cc cc
>> cc cc cc cc cc <8b> 87 90 01 00 00 85 c0 0f 95 c0 c3 0f 1f 40 00 8b 87
>> 90 00 00 00
>> [ 1.027257][ T1] RSP: 0000:ffffaf8280013b50 EFLAGS: 00010286
>> [ 1.027257][ T1] RAX: ffff9149f6fe1a00 RBX: ffff9149f8812000
>> RCX: 0000000000000000
>> [ 1.027257][ T1] RDX: 0000000000000000 RSI: ffff9149f6fe1a00
>> RDI: 0000000000000000
>> [ 1.027257][ T1] RBP: ffffaf8280013b68 R08: 0000000000000025
>> R09: 0000000000000000
>> [ 1.027257][ T1] R10: ffff9149f6fe1a00 R11: ffff9149f6e3ac7a
>> R12: ffff9149f6fe1a00
>> [ 1.027257][ T1] R13: ffff9149f6ea9000 R14: ffff9149f8810000
>> R15: ffff9149f8812000
>> [ 1.027257][ T1] FS: 0000000000000000(0000)
>> GS:ffff9149faec0000(0000) knlGS:0000000000000000
>> [ 1.027257][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 1.027257][ T1] CR2: 0000000000000190 CR3: 0000000081009001
>> CR4: 00000000001606e0
>> [ 1.027257][ T1] Call Trace:
>> [ 1.027257][ T1] ? __drm_atomic_helper_crtc_reset+0x1e/0x50
>> [ 1.027257][ T1] vmw_du_crtc_reset+0x46/0x60
>> [ 1.027257][ T1] vmw_kms_stdu_init_display+0x216/0x380
>> [ 1.027257][ T1] vmw_kms_init+0x6d/0xc0
>> [ 1.027257][ T1] vmw_driver_load.cold.21+0xba2/0xdf8
>> [ 1.027257][ T1] vmw_probe+0x5f/0xb0
>> [ 1.027257][ T1] pci_device_probe+0xcf/0x140
>> [ 1.027257][ T1] really_probe+0x1b3/0x3d0
>> [ 1.027257][ T1] ? rdinit_setup+0x27/0x27
>> [ 1.027257][ T1] driver_probe_device+0xe3/0x150
>> [ 1.027257][ T1] device_driver_attach+0x53/0x60
>> [ 1.027257][ T1] __driver_attach+0x87/0x140
>> [ 1.027257][ T1] ? device_driver_attach+0x60/0x60
>> [ 1.027257][ T1] ? device_driver_attach+0x60/0x60
>> [ 1.027257][ T1] bus_for_each_dev+0x6e/0xb0
>> [ 1.027257][ T1] ? _cond_resched+0x14/0x30
>> [ 1.027257][ T1] driver_attach+0x19/0x20
>> [ 1.027257][ T1] bus_add_driver+0x14a/0x1f0
>> [ 1.027257][ T1] driver_register+0x6b/0xc0
>> [ 1.027257][ T1] __pci_register_driver+0x4f/0x60
>> [ 1.027257][ T1] vmwgfx_init+0x28/0x3f
>> [ 1.027257][ T1] ? ttm_init+0x5e/0x5e
>> [ 1.027257][ T1] do_one_initcall+0x43/0x1a0
>> [ 1.027257][ T1] kernel_init_freeable+0x14e/0x1b9
>> [ 1.027257][ T1] ? rest_init+0x9b/0x9b
>> [ 1.027257][ T1] kernel_init+0x9/0xf5
>> [ 1.027257][ T1] ret_from_fork+0x1f/0x30
>> [ 1.027257][ T1] Modules linked in:
>> [ 1.027257][ T1] CR2: 0000000000000190
>> [ 1.027257][ T1] ---[ end trace 8db9188472e5abda ]---
>> [ 1.027257][ T1] RIP: 0010:drm_dev_has_vblank+0x0/0x10
>> [ 1.027257][ T1] Code: 84 2f ff ff ff e9 10 ff ff ff 89 f1 44 89
>> ff 45 31 d2 d3 e7 89 f9 e9 f7 fe ff ff cc cc cc cc cc cc cc cc cc cc
>> cc cc cc cc cc <8b> 87 90 01 00 00 85 c0 0f 95 c0 c3 0f 1f 40 00 8b 87
>> 90 00 00 00
>> [ 1.027257][ T1] RSP: 0000:ffffaf8280013b50 EFLAGS: 00010286
>> [ 1.027257][ T1] RAX: ffff9149f6fe1a00 RBX: ffff9149f8812000
>> RCX: 0000000000000000
>> [ 1.027257][ T1] RDX: 0000000000000000 RSI: ffff9149f6fe1a00
>> RDI: 0000000000000000
>> [ 1.027257][ T1] RBP: ffffaf8280013b68 R08: 0000000000000025
>> R09: 0000000000000000
>> [ 1.027257][ T1] R10: ffff9149f6fe1a00 R11: ffff9149f6e3ac7a
>> R12: ffff9149f6fe1a00
>> [ 1.027257][ T1] R13: ffff9149f6ea9000 R14: ffff9149f8810000
>> R15: ffff9149f8812000
>> [ 1.027257][ T1] FS: 0000000000000000(0000)
>> GS:ffff9149faec0000(0000) knlGS:0000000000000000
>> [ 1.027257][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 1.027257][ T1] CR2: 0000000000000190 CR3: 0000000081009001
>> CR4: 00000000001606e0
>> [ 1.027257][ T1] Kernel panic - not syncing: Attempted to kill
>> init! exitcode=0x00000009
>> [ 1.027257][ T1] Kernel Offset: 0xf000000 from
>> 0xffffffff81000000 (relocation range:
>> 0xffffffff80000000-0xffffffffbfffffff)
>>
>> --- Crash pattern 2 ---
>>
>> [ 1.458665][ T1] Linux agpgart interface v0.103
>> [ 1.459068][ T1] [drm] DMA map mode: Caching DMA mappings.
>> [ 1.460076][ T1] [drm] Capabilities:
>> [ 1.461045][ T1] [drm] Rect copy.
>> [ 1.461065][ T1] [drm] Cursor.
>> [ 1.462056][ T1] [drm] Cursor bypass.
>> [ 1.463101][ T1] [drm] Cursor bypass 2.
>> [ 1.464041][ T1] [drm] 8bit emulation.
>> [ 1.465012][ T1] [drm] Alpha cursor.
>> [ 1.465032][ T1] [drm] 3D.
>> [ 1.466037][ T1] [drm] Extended Fifo.
>> [ 1.467092][ T1] [drm] Multimon.
>> [ 1.468000][ T1] [drm] Pitchlock.
>> [ 1.468053][ T1] [drm] Irq mask.
>> [ 1.469037][ T1] [drm] Display Topology.
>> [ 1.470065][ T1] [drm] GMR.
>> [ 1.470085][ T1] [drm] Traces.
>> [ 1.471042][ T1] [drm] GMR2.
>> [ 1.471062][ T1] [drm] Screen Object 2.
>> [ 1.472038][ T1] [drm] Command Buffers.
>> [ 1.473048][ T1] [drm] Command Buffers 2.
>> [ 1.474045][ T1] [drm] Guest Backed Resources.
>> [ 1.475055][ T1] [drm] DX Features.
>> [ 1.476046][ T1] [drm] HP Command Queue.
>> [ 1.477045][ T1] [drm] Capabilities2:
>> [ 1.478043][ T1] [drm] Grow oTable.
>> [ 1.479044][ T1] [drm] IntraSurface copy.
>> [ 1.480055][ T1] [drm] Max GMR ids is 64
>> [ 1.481039][ T1] [drm] Max number of GMR pages is 65536
>> [ 1.482045][ T1] [drm] Max dedicated hypervisor surface memory
>> is 0 kiB
>> [ 1.483047][ T1] [drm] Maximum display memory size is 262144 kiB
>> [ 1.484064][ T1] [drm] VRAM at 0xe8000000 size is 4096 kiB
>> [ 1.485042][ T1] [drm] MMIO at 0xfe000000 size is 256 kiB
>> [ 1.486389][ T1] [TTM] Zone kernel: Available graphics memory:
>> 1880780 KiB
>> [ 1.488043][ T1] [TTM] Initializing pool allocator
>> [ 1.489054][ T1] [TTM] Initializing DMA pool allocator
>> [ 1.490057][ T1] [drm] Screen Target Display device initialized
>> [ 1.491077][ T1] [drm] width 800
>> [ 1.491999][ T1] [drm] height 480
>> [ 1.492061][ T1] [drm] bpp 32
>> [ 1.494078][ T1] [drm] Fifo max 0x00040000 min 0x00001000 cap
>> 0x0000077f
>> [ 1.495081][ T1] BUG: kernel NULL pointer dereference, address:
>> 000000000000003c
>> [ 1.496056][ T1] #PF: supervisor read access in kernel mode
>> [ 1.496056][ T1] #PF: error_code(0x0000) - not-present page
>> [ 1.496056][ T1] PGD 0 P4D 0
>> [ 1.496056][ T1] Oops: 0000 [#1] SMP
>> [ 1.496056][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
>> 5.8.0-rc2+ #783
>> [ 1.496056][ T1] Hardware name: VMware, Inc. VMware Virtual
>> Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020
>> [ 1.496056][ T1] RIP: 0010:vmw_ttm_populate+0x2/0xa0
>> [ 1.496056][ T1] Code: 0f 1f 84 00 00 00 00 00 55 48 8b 86 c8 00
>> 00 00 48 8b 80 80 00 00 00 48 89 e5 48 8b 30 e8 76 5f 00 00 5d c3 0f
>> 1f 40 00 31 c0 <83> 7f 3c 02 75 35 55 48 89 e5 41 56 41 55 41 54 49 89
>> f4 53 48 89
>> [ 1.496056][ T1] RSP: 0000:ffffb0f880013b10 EFLAGS: 00010246
>> [ 1.496056][ T1] RAX: 0000000000000000 RBX: ffff8a69399c5000
>> RCX: ffff8a693a4c8000
>> [ 1.496056][ T1] RDX: 0000000000000000 RSI: ffffb0f880013b20
>> RDI: 0000000000000000
>> [ 1.496056][ T1] RBP: ffffb0f880013b70 R08: ffff8a69399c5000
>> R09: ffffffffaac72af4
>> [ 1.496056][ T1] R10: ffffffffab044e20 R11: ffff8a693683a178
>> R12: ffff8a69399c9800
>> [ 1.496056][ T1] R13: ffff8a6936815bc0 R14: ffff8a69399c5618
>> R15: 0000000000000000
>> [ 1.496056][ T1] FS: 0000000000000000(0000)
>> GS:ffff8a693ae00000(0000) knlGS:0000000000000000
>> [ 1.496056][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 1.496056][ T1] CR2: 000000000000003c CR3: 0000000108009001
>> CR4: 00000000001606f0
>> [ 1.496056][ T1] Call Trace:
>> [ 1.496056][ T1] ? vmw_otables_setup+0x120/0x330
>> [ 1.496056][ T1] vmw_request_device_late+0x42/0x80
>> [ 1.496056][ T1] vmw_request_device+0x67/0x260
>> [ 1.496056][ T1] vmw_driver_load.cold.21+0xcb1/0xdf8
>> [ 1.496056][ T1] vmw_probe+0x5f/0xb0
>> [ 1.496056][ T1] pci_device_probe+0xcf/0x140
>> [ 1.496056][ T1] really_probe+0x1b3/0x3d0
>> [ 1.496056][ T1] ? rdinit_setup+0x27/0x27
>> [ 1.496056][ T1] driver_probe_device+0xe3/0x150
>> [ 1.496056][ T1] device_driver_attach+0x53/0x60
>> [ 1.496056][ T1] __driver_attach+0x87/0x140
>> [ 1.496056][ T1] ? device_driver_attach+0x60/0x60
>> [ 1.496056][ T1] ? device_driver_attach+0x60/0x60
>> [ 1.496056][ T1] bus_for_each_dev+0x6e/0xb0
>> [ 1.496056][ T1] ? _cond_resched+0x14/0x30
>> [ 1.496056][ T1] driver_attach+0x19/0x20
>> [ 1.496056][ T1] bus_add_driver+0x14a/0x1f0
>> [ 1.496056][ T1] driver_register+0x6b/0xc0
>> [ 1.496056][ T1] __pci_register_driver+0x4f/0x60
>> [ 1.496056][ T1] vmwgfx_init+0x28/0x3f
>> [ 1.496056][ T1] ? ttm_init+0x5e/0x5e
>> [ 1.496056][ T1] do_one_initcall+0x43/0x1a0
>> [ 1.496056][ T1] kernel_init_freeable+0x14e/0x1b9
>> [ 1.496056][ T1] ? rest_init+0x9b/0x9b
>> [ 1.496056][ T1] kernel_init+0x9/0xf5
>> [ 1.496056][ T1] ret_from_fork+0x1f/0x30
>> [ 1.496056][ T1] Modules linked in:
>> [ 1.496056][ T1] CR2: 000000000000003c
>> [ 1.496056][ T1] ---[ end trace 9f43ab7728d116d5 ]---
>> [ 1.496056][ T1] RIP: 0010:vmw_ttm_populate+0x2/0xa0
>> [ 1.496056][ T1] Code: 0f 1f 84 00 00 00 00 00 55 48 8b 86 c8 00
>> 00 00 48 8b 80 80 00 00 00 48 89 e5 48 8b 30 e8 76 5f 00 00 5d c3 0f
>> 1f 40 00 31 c0 <83> 7f 3c 02 75 35 55 48 89 e5 41 56 41 55 41 54 49 89
>> f4 53 48 89
>> [ 1.496056][ T1] RSP: 0000:ffffb0f880013b10 EFLAGS: 00010246
>> [ 1.496056][ T1] RAX: 0000000000000000 RBX: ffff8a69399c5000
>> RCX: ffff8a693a4c8000
>> [ 1.496056][ T1] RDX: 0000000000000000 RSI: ffffb0f880013b20
>> RDI: 0000000000000000
>> [ 1.496056][ T1] RBP: ffffb0f880013b70 R08: ffff8a69399c5000
>> R09: ffffffffaac72af4
>> [ 1.496056][ T1] R10: ffffffffab044e20 R11: ffff8a693683a178
>> R12: ffff8a69399c9800
>> [ 1.496056][ T1] R13: ffff8a6936815bc0 R14: ffff8a69399c5618
>> R15: 0000000000000000
>> [ 1.496056][ T1] FS: 0000000000000000(0000)
>> GS:ffff8a693ae00000(0000) knlGS:0000000000000000
>> [ 1.496056][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 1.496056][ T1] CR2: 000000000000003c CR3: 0000000108009001
>> CR4: 00000000001606f0
>> [ 1.496056][ T1] Kernel panic - not syncing: Attempted to kill
>> init! exitcode=0x00000009
>> [ 1.496056][ T1] Kernel Offset: 0x29000000 from
>> 0xffffffff81000000 (relocation range:
>> 0xffffffff80000000-0xffffffffbfffffff)
>>
>> --- Expected result ---
>>
>> [ 1.282746][ T1] Linux agpgart interface v0.103
>> [ 1.284885][ T1] [drm] DMA map mode: Caching DMA mappings.
>> [ 1.287860][ T1] [drm] Capabilities:
>> [ 1.289812][ T1] [drm] Rect copy.
>> [ 1.290785][ T1] [drm] Cursor.
>> [ 1.291784][ T1] [drm] Cursor bypass.
>> [ 1.292784][ T1] [drm] Cursor bypass 2.
>> [ 1.293808][ T1] [drm] 8bit emulation.
>> [ 1.294785][ T1] [drm] Alpha cursor.
>> [ 1.295778][ T1] [drm] 3D.
>> [ 1.296775][ T1] [drm] Extended Fifo.
>> [ 1.297775][ T1] [drm] Multimon.
>> [ 1.298775][ T1] [drm] Pitchlock.
>> [ 1.299775][ T1] [drm] Irq mask.
>> [ 1.300775][ T1] [drm] Display Topology.
>> [ 1.301776][ T1] [drm] GMR.
>> [ 1.302795][ T1] [drm] Traces.
>> [ 1.303798][ T1] [drm] GMR2.
>> [ 1.304776][ T1] [drm] Screen Object 2.
>> [ 1.305776][ T1] [drm] Command Buffers.
>> [ 1.306776][ T1] [drm] Command Buffers 2.
>> [ 1.307776][ T1] [drm] Guest Backed Resources.
>> [ 1.308775][ T1] [drm] DX Features.
>> [ 1.309797][ T1] [drm] HP Command Queue.
>> [ 1.310776][ T1] [drm] Capabilities2:
>> [ 1.311776][ T1] [drm] Grow oTable.
>> [ 1.312775][ T1] [drm] IntraSurface copy.
>> [ 1.313806][ T1] [drm] Max GMR ids is 64
>> [ 1.314780][ T1] [drm] Max number of GMR pages is 65536
>> [ 1.315777][ T1] [drm] Max dedicated hypervisor surface memory
>> is 0 kiB
>> [ 1.316776][ T1] [drm] Maximum display memory size is 262144 kiB
>> [ 1.317777][ T1] [drm] VRAM at 0xe8000000 size is 4096 kiB
>> [ 1.318776][ T1] [drm] MMIO at 0xfe000000 size is 256 kiB
>> [ 1.320259][ T1] [TTM] Zone kernel: Available graphics memory:
>> 1880776 KiB
>> [ 1.320800][ T1] [TTM] Initializing pool allocator
>> [ 1.321780][ T1] [TTM] Initializing DMA pool allocator
>> [ 1.323796][ T1] [drm] Supports vblank timestamp caching Rev 2
>> (21.10.2013).
>> [ 1.324816][ T1] [drm] Screen Target Display device initialized
>> [ 1.325797][ T1] [drm] width 800
>> [ 1.326790][ T1] [drm] height 480
>> [ 1.327782][ T1] [drm] bpp 32
>> [ 1.330791][ T1] [drm] Fifo max 0x00040000 min 0x00001000 cap
>> 0x0000077f
>> [ 1.345830][ T1] [drm] Using command buffers with DMA pool.
>> [ 1.346834][ T1] [drm] Atomic: yes.
>> [ 1.347825][ T1] [drm] SM4_1 support available.
>> [ 1.364948][ T1] fbcon: svgadrmfb (fb0) is primary device
>> [ 1.366787][ T1] Console: switching to colour frame buffer
>> device 100x37
>> [ 1.471079][ T1] [drm] Initialized vmwgfx 2.18.0 20200114 for
>> 0000:00:0f.0 on minor 0
>>
>> --- Bisect log ---
>>
>> git bisect start ec731e516acf22ce870b735721c6f59e39d0ed44
>> 442489c219235991de86d0277b5d859ede6d8792 v5.8 v5.7 v5.6 v5.5 v5.4 v5.3
>> v5.2 v5.1 v5.0 drivers/gpu/
>>
>> # bad: [ec731e516acf22ce870b735721c6f59e39d0ed44] drm/ttm:
>> ttm_bo_swapout_all doesn't use it's argument.
>> # good: [442489c219235991de86d0277b5d859ede6d8792] Merge tag
>> 'timers-core-2020-08-04' of
>> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>> # good: [bcf876870b95592b52519ed4aafcf9d95999bc9c] Linux 5.8
>> # good: [3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162] Linux 5.7
>> # good: [7111951b8d4973bda27ff663f2cf18b663d15b48] Linux 5.6
>> # good: [d5226fa6dbae0569ee43ecfc08bdcd6770fc4755] Linux 5.5
>> # good: [219d54332a09e8d8741c1e1982f5eae56099de85] Linux 5.4
>> # good: [4d856f72c10ecb060868ed10ff1b1453943fc6c8] Linux 5.3
>> # good: [0ecfebd2b52404ae0c54a878c872bb93363ada36] Linux 5.2
>> # good: [e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd] Linux 5.1
>> # good: [1c163f4c7b3f621efff9b28a47abb36f7378d783] Linux 5.0
>> git bisect start 'ec731e516acf22ce870b735721c6f59e39d0ed44'
>> '442489c219235991de86d0277b5d859ede6d8792' 'v5.8' 'v5.7' 'v5.6' 'v5.5'
>> 'v5.4' 'v5.3' 'v5.2' 'v5.1' 'v5.0' 'drivers/gpu/'
>> # good: [ba47d845d715a010f7b51f6f89bae32845e6acb7] Linux 5.8-rc6
>> git bisect good ba47d845d715a010f7b51f6f89bae32845e6acb7
>> # good: [429f3d24384b049925771c56b5bc2850cede958f] drm/amdgpu: asd
>> function needs to be unloaded in suspend phase
>> git bisect good 429f3d24384b049925771c56b5bc2850cede958f
>> # bad: [4145cb541668eb48ac7d028d4e27b5f1b7378e4c] Merge tag
>> 'drm-misc-next-2020-07-22' of
>> git://anongit.freedesktop.org/drm/drm-misc into drm-next
>> git bisect bad 4145cb541668eb48ac7d028d4e27b5f1b7378e4c
>> # good: [90d4f99ac56b4aadf4e87871a4e9128474da259b] drm/i915/dp_mst:
>> Clear the ACT sent flag during encoder disabling too
>> git bisect good 90d4f99ac56b4aadf4e87871a4e9128474da259b
>> # bad: [39913934e67cab214480cc95a3632696aeb8e71a] drm: amdgpu: fix
>> common struct sg_table related issues
>> git bisect bad 39913934e67cab214480cc95a3632696aeb8e71a
>> # bad: [1d4eff87878977fde110f311c4fa123e93ba2b3d] drm/meson: add
>> Amlogic Video FBC registers
>> git bisect bad 1d4eff87878977fde110f311c4fa123e93ba2b3d
>> # bad: [1185c406f11a49335253036feaa0169c0d174ef8] drm: panel: simple:
>> Warn in case of incorrect bus format for LVDS panels
>> git bisect bad 1185c406f11a49335253036feaa0169c0d174ef8
>> # good: [84e543bc9d1dc550132ba25b72df28d40cc44333] drm/connector: fix
>> minor typos in comments
>> git bisect good 84e543bc9d1dc550132ba25b72df28d40cc44333
>> # bad: [536faa450e17f32fddb1a2124e3df71a966122cd] drm: Add helper to
>> compare edids.
>> git bisect bad 536faa450e17f32fddb1a2124e3df71a966122cd
>> # bad: [2ddef17678bc2ea1d20517dd2b4ed4aa967ffa8b] drm/ttm: make TT
>> creation purely optional v3
>> git bisect bad 2ddef17678bc2ea1d20517dd2b4ed4aa967ffa8b
>> # good: [58e4d686d456c3e356439ae160ff4a0728940b8e] drm/ttm: cleanup
>> ttm_mem_type_manager_func.get_node interface v3
>> git bisect good 58e4d686d456c3e356439ae160ff4a0728940b8e
>> # first bad commit: [2ddef17678bc2ea1d20517dd2b4ed4aa967ffa8b]
>> drm/ttm: make TT creation purely optional v3
>
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