Am 06.06.2018 um 17:44 schrieb Gabriel C:
2018-06-06 17:03 GMT+02:00 Michel Dänzer <michel@xxxxxxxxxxx>:
On 2018-06-06 04:44 PM, Christian König wrote:
Am 06.06.2018 um 16:12 schrieb Michel Dänzer:
[SNIP]
At least in theory it should work when we use the coherent DMA allocator.
When that really worked before, so the most likely commit which broke
this is:
commit fd5fd480dd8fe4910546e7b080b3ae345e57fe9f
Author: Chunming Zhou <david1.zhou@xxxxxxx>
Date: Fri Feb 9 10:44:09 2018 +0800
drm/amdgpu: only enable swiotlb alloc when need v2
get the max io mapping address of system memory to see if it is over
our card accessing range.
v2: move checking later
Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
Reviewed-by: Monk Liu <monk.liu@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Currently looking into how we could somehow improve this detection.
I guess this could fit for Gabriel, but e.g.
https://bugs.freedesktop.org/104437 says amdgpu was already broken with
SME in 4.15, if not 4.14 (I suspect there was simply no SME support
earlier).
And what I totally missed is that Gabriel is using radeon and not amdgpu.
So Gabriel you need to revert this one for testing:
commit 1bc3d3cce8c3b44c2b5ac6cee98c830bb40e6b0f
Author: Chunming Zhou <david1.zhou@xxxxxxx>
Date: Fri Feb 9 10:44:10 2018 +0800
drm/radeon: only enable swiotlb path when need v2
swiotlb expands our card accessing range, but its path always is slower
than ttm pool allocation.
So add condition to use it.
v2: move a bit later
Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
Reviewed-by: Monk Liu <monk.liu@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Link:
https://patchwork.freedesktop.org/patch/msgid/20180209024410.1469-3-david1.zhou@xxxxxxx
I got strange performance issue with 4.15 and 4.16 .. but SME was ON
on that setup ( even before it hit mainline ) and never broke the GPU like this.
Well that is very interesting, you are the first one who reports that
SME + GFX works in some way. So far we only got negative reports for that.
There is a 4.16.13 boot dmesg which has no such issue:
http://ftp.frugalware.org/pub/other/people/crazy/radeon/dmesg-radeon-SME-ON-kernel-4.16.txt
With the setup as is booting 4.16.x works , while 4.17 trows the errors.
Please do the bisect if the patch I've mentioned above doesn't help.
Thanks,
Christian.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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