vcn regression on raven1

Wed May 2 01:41:48 UTC 2018

Hi Jerry,

Like I said it's (now well) past EOD (meaning my workstation is powered off) so I'll have to check tomorrow.  But I do pull from gerrit daily and build from that.

I'll take a look in the morning.

Cheers,
Tom
________________________________________
From: Zhang, Jerry
Sent: Tuesday, May 1, 2018 21:39
To: StDenis, Tom; Deucher, Alexander
Cc: Koenig, Christian; amd-gfx at lists.freedesktop.org
Subject: Re: vcn regression on raven1

Hi Tom,

Do you mean you cannot find the patch from gerrit/amd-staging-dkms-next either?

I do find it.

the tip of gerrit/amd-staging-drm-next is
   * bb54e82 2018-04-30 12:17:07 -0400 drm/amdgpu: Switch to interruptable wait
to recover from ring hang. <Andrey Grodzovsky>

while the tip of freedesktop is
   * a11008c 2018-04-25 20:32:05 -0500 drm/powerplay: Add powertune table for
VEGAM <Eric Huang>

Jerry

On 05/02/2018 09:29 AM, StDenis, Tom wrote:
> I pull from gerrit.  I'm just pointing out that it's not on drm-next upstream either.
>
> It may have been missed in a rebase or something.
>
> Tom
> ________________________________________
> From: Zhang, Jerry
> Sent: Tuesday, May 1, 2018 21:07
> To: StDenis, Tom; Deucher, Alexander
> Cc: Koenig, Christian; amd-gfx at lists.freedesktop.org
> Subject: Re: vcn regression on raven1
>
> Hi Tom,
>
> Sound you get the code from freedesktop rather than the internal drm-next.
> Unfortunately freedesktop looks delay to sync the code from internal drm-next.
> That's the gap it happened as issue in the test.
>
> Hi Alex,
>
> Is that a issue for code syncing between freedesktop and internal drm-next?
> Or it's a known issue of delay syncing code.
>
> Jerry
>
> On 05/02/2018 08:57 AM, StDenis, Tom wrote:
>> Hi Jerry,
>>
>> It's well past EOD for me I'll pick this up in the morning.
>>
>> I'm fairly certain I wrote my patch against the tip of amd-staging-drm-next as of my pull this morning though.
>>
>> If it's in there and I missed it somehow I apologize otherwise it'd be nice to make sure it's in there.
>>
>> Based on the public copy of the tree it's not there
>>
>> https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c?h=amd-staging-drm-next#n1110
>>
>> Cheers,
>> Tom
>> ________________________________________
>> From: Zhang, Jerry
>> Sent: Tuesday, May 1, 2018 20:52
>> To: StDenis, Tom; Deucher, Alexander
>> Cc: Koenig, Christian; amd-gfx at lists.freedesktop.org
>> Subject: Re: vcn regression on raven1
>>
>> Hi Tom,
>>
>> It was landed in the latest drm-next, like
>>      * 964933a 2018-04-27 10:26:09 +0800 drm/amdgpu/uvd7: add
>> emit_reg_write_reg_wait ring callback <Xiaojie Yuan>
>>
>> Did you test with that included?
>> Please try to get the latest drm-next, if not.
>> They look the same issue from the log.
>>
>> Jerry
>>
>> On 05/02/2018 08:47 AM, StDenis, Tom wrote:
>>> Hi Jerry,
>>>
>>> So far as I know this wasn't included on the tip of drm-next.  I hit this this morning in my semi-regular pull/build/test cycle.
>>>
>>> Was this missed in a recent rebase?
>>>
>>> Tom
>>> ________________________________________
>>> From: Zhang, Jerry
>>> Sent: Tuesday, May 1, 2018 20:43
>>> To: StDenis, Tom; Deucher, Alexander
>>> Cc: Koenig, Christian; amd-gfx at lists.freedesktop.org
>>> Subject: Re: vcn regression on raven1
>>>
>>> On 05/01/2018 09:34 PM, Tom St Denis wrote:
>>>> Hi all,
>>>>
>>>> I've noticed that on the tip of drm-next vcn playback of video is broken (see
>>>> dmesg below).  I've bisected it to this commit
>>>
>>> It may be fixed here as a common issue.
>>>
>>>       * https://patchwork.freedesktop.org/patch/218909/
>>>
>>> Jerry
>>>
>>>>
>>>> [root at raven linux]# git bisect good
>>>> 701372349fd55b5396b335580e979ac4dde3dd02 is the first bad commit
>>>> commit 701372349fd55b5396b335580e979ac4dde3dd02
>>>> Author: Alex Deucher <alexander.deucher at amd.com>
>>>> Date:   Tue Mar 27 17:10:56 2018 -0500
>>>>
>>>>         drm/amdgpu/gmc9: use amdgpu_ring_emit_reg_write_reg_wait in gpu tlb flush
>>>>
>>>>         Use amdgpu_ring_emit_reg_write_reg_wait.  On engines that support it,
>>>>         it provides a write and wait in a single packet which avoids a missed
>>>>         ack if a world switch happens between the request and waiting for the
>>>>         ack.
>>>>
>>>>         Reviewed-by: Huang Rui <ray.huang at amd.com>
>>>>         Reviewed-by: Christian König <christian.koenig at amd.com>
>>>>         Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>>>>
>>>> :040000 040000 4e4312de03f4b34abd65f4bb12dba4c7093055ba
>>>> ccc4abc78c0b6f24328fd998f998fa06bf0618b1 M      drivers
>>>>
>>>> Which is odd because the commit before this is the vcn change and it works fine
>>>> (playing BBB right now).
>>>>
>>>> Here's the dmesg:
>>>>
>>>> [ 2925.640102] BUG: unable to handle kernel NULL pointer dereference at
>>>> 0000000000000000
>>>> [ 2925.640113] IP:           (null)
>>>> [ 2925.640116] PGD 0 P4D 0
>>>> [ 2925.640122] Oops: 0010 [#1] SMP KASAN NOPTI
>>>> [ 2925.640126] Modules linked in: tun fuse amdkfd amdgpu mfd_core chash
>>>> gpu_sched ttm ax88179_178a usbnet
>>>> [ 2925.640139] CPU: 4 PID: 3791 Comm: vcn_dec Not tainted 4.16.0-rc7+ #20
>>>> [ 2925.640142] Hardware name: System manufacturer System Product Name/TUF
>>>> B350M-PLUS GAMING, BIOS 3803 01/22/2018
>>>> [ 2925.640146] RIP: 0010:          (null)
>>>> [ 2925.640148] RSP: 0018:ffff8801d54f7790 EFLAGS: 00010206
>>>> [ 2925.640153] RAX: 0000000000000000 RBX: ffff8801d8b38420 RCX: 00000000007c0080
>>>> [ 2925.640156] RDX: 000000000001a6fa RSI: 000000000001a6e8 RDI: ffff8801d8b38420
>>>> [ 2925.640159] RBP: 000000000001a6fa R08: 0000000000000080 R09: ffffed003aa9eef9
>>>> [ 2925.640162] R10: 0000000009c74f08 R11: fffffbfff0f5d1e7 R12: ffff8801d8b3277c
>>>> [ 2925.640164] R13: ffff8801d8b3001c R14: 0000000000000005 R15: 0000000000000000
>>>> [ 2925.640168] FS:  0000000000000000(0000) GS:ffff8801dcf00000(0000)
>>>> knlGS:0000000000000000
>>>> [ 2925.640171] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [ 2925.640174] CR2: 0000000000000000 CR3: 00000001d9712000 CR4: 00000000003406e0
>>>> [ 2925.640176] Call Trace:
>>>> [ 2925.640272]  ? gmc_v9_0_emit_flush_gpu_tlb+0x260/0x2a0 [amdgpu]
>>>> [ 2925.640368]  ? vcn_v1_0_dec_ring_insert_start+0x360/0x360 [amdgpu]
>>>> [ 2925.640459]  ? mmhub_v1_0_get_clockgating+0xc0/0xc0 [amdgpu]
>>>> [ 2925.640545]  ? amdgpu_vmid_had_gpu_reset+0x89/0xc0 [amdgpu]
>>>> [ 2925.640640]  ? vcn_v1_0_dec_ring_emit_vm_flush+0x64/0xb0 [amdgpu]
>>>> [ 2925.640725]  ? amdgpu_vm_flush+0xb43/0xcc0 [amdgpu]
>>>> [ 2925.640810]  ? amdgpu_vm_need_pipeline_sync+0x260/0x260 [amdgpu]
>>>> [ 2925.640897]  ? amdgpu_vmid_had_gpu_reset+0xc0/0xc0 [amdgpu]
>>>> [ 2925.641003]  ? vcn_v1_0_dec_ring_insert_start+0x2d7/0x360 [amdgpu]
>>>> [ 2925.641095]  ? amdgpu_ib_schedule+0x1b5/0x800 [amdgpu]
>>>> [ 2925.641102]  ? dma_fence_add_callback+0x15f/0x360
>>>> [ 2925.641201]  ? amdgpu_job_run+0x32f/0x370 [amdgpu]
>>>> [ 2925.641297]  ? amdgpu_job_free_resources+0xd0/0xd0 [amdgpu]
>>>> [ 2925.641302]  ? __queue_delayed_work+0x144/0x1d0
>>>> [ 2925.641306]  ? delayed_work_timer_fn+0x40/0x40
>>>> [ 2925.641312]  ? prepare_to_wait_exclusive+0x1d0/0x1d0
>>>> [ 2925.641318]  ? drm_sched_main+0x68c/0x940 [gpu_sched]
>>>> [ 2925.641323]  ? drm_sched_entity_fini+0x60/0x60 [gpu_sched]
>>>> [ 2925.641328]  ? save_stack+0x89/0xb0
>>>> [ 2925.641332]  ? wait_woken+0x110/0x110
>>>> [ 2925.641337]  ? ret_from_fork+0x22/0x40
>>>> [ 2925.641343]  ? __schedule+0xd30/0xd30
>>>> [ 2925.641346]  ? remove_wait_queue+0x150/0x150
>>>> [ 2925.641353]  ? rcu_note_context_switch+0x2a0/0x2a0
>>>> [ 2925.641359]  ? __lock_text_start+0x8/0x8
>>>> [ 2925.641367]  ? drm_sched_entity_fini+0x60/0x60 [gpu_sched]
>>>> [ 2925.641371]  ? kthread+0x19b/0x1c0
>>>> [ 2925.641376]  ? kthread_create_worker_on_cpu+0xc0/0xc0
>>>> [ 2925.641382]  ? ret_from_fork+0x22/0x40
>>>> [ 2925.641387] Code:  Bad RIP value.
>>>> [ 2925.641397] RIP:           (null) RSP: ffff8801d54f7790
>>>> [ 2925.641400] CR2: 0000000000000000
>>>> [ 2925.641405] ---[ end trace 0684cc0468f60fb1 ]---
>>>>
>>>>
>>>> Note that regular compute/gfx workflows work fine on the tip of drm-next only
>>>> vcn playback triggeers this (haven't tried encode yet...).
>>>>
>>>> Cheers,
>>>> Tom
>>>> _______________________________________________
>>>> amd-gfx mailing list
>>>> amd-gfx at lists.freedesktop.org
>>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx