On 15/03/17 04:33 PM, Christian König wrote: > Am 15.03.2017 um 02:59 schrieb Michel Dänzer: >> [ Moving this sub-thread to the amd-gfx mailing list ] >> >> On 14/03/17 07:02 PM, Thorsten Leemhuis wrote: >>> Hi! Find below my first regression report for Linux 4.11. It lists 9 >>> regressions I'm currently aware of. >> [...] >> >>> Desc: DRM BUG while initializing cape verde (2nd card) >>> Repo: 2017-03-13 https://bugzilla.kernel.org/show_bug.cgi?id=194867 >>> Stat: n/a >>> Note: patch proposed by reporter >> I don't see any patch. >> >> Looks like the amdgpu driver has never fully initialized GDS support for >> SI family GPUs, and this now triggers the DRM_MM_BUG_ON which was added >> to drm_mm_init in 4.11. >> >> AMD folks, should this be addressed by fleshing out SI GDS support, or >> by completely disabling GDS initialization for SI? > Uff, good question. IIRC GDS was significantly different between SI and > CIK in the hardware and requires pinned buffers on SI (userspace needs > to know the physical address of the buffer). > > So the current implementation most likely doesn't work as expected. > > I would say disable it for now, but keep any existing code for at least > one release. If nobody finds time to fix it properly (which is likely) > we can throw away that and move on. Any takers for 4.11? :) -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
