[Mesa-dev] [PATCH 1/2] radeonsi: set a per-buffer flag that disables inter-process sharing (v4)

[Michel Dänzer]

On 01/09/17 07:23 PM, Nicolai Hähnle wrote:
> On 01.09.2017 11:58, Michel Dänzer wrote:
>> On 29/08/17 11:47 PM, Christian König wrote:
>>> From: Marek Olšák <marek.olsak at amd.com>
>>>
>>> For lower overhead in the CS ioctl.
>>> Winsys allocators are not used with interprocess-sharable resources.
>>>
>>> v2: It shouldn't crash anymore, but the kernel will reject the new flag.
>>> v3 (christian): Rename the flag, avoid sending those buffers in the
>>> BO list.
>>> v4 (christian): Remove setting the kernel flag for now
>>
>> This change seems to have caused a GPU hang when running piglit on my
>> Kaveri with the radeon kernel driver. Haven't been able to isolate it to
>> a specific test, seems to only happen when running multiple tests
>> concurrently. There's a GPUVM fault before the hang, I suspect it's
>> related:
>>
>> radeon 0000:00:01.0: GPU fault detected: 146 0x0ae6760c
>> radeon 0000:00:01.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x000001D7
>> radeon 0000:00:01.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0607600C
>> VM fault (0x0c, vmid 3) at page 471, read from 'CPF' (0x43504600) (118)
>>
>>
>> Any ideas?
> 
> Only that "read from CPF" means it can only be one of:
> 
> - command buffers
> - indirect draw data
> - predication data (conditional render)
> 
> (I hope I didn't miss anything)
> 
> Hmm, actually, I think CI has unavoidable VM faults related to
> ARB_sparse_buffers, so this may be benign. You could try to exclude the
> ARB_sparse_buffers tests.

GL_ARB_sparse_buffer isn't supported with the radeon kernel driver AFAICT.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer