OK. I will see. :) Thanks for the comments. -----Original Message----- From: Chris Wilson [mailto:chris@xxxxxxxxxxxxxxxxxx] Sent: Friday, March 11, 2016 7:28 PM To: Wang, Zhi A Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; igvt-g@xxxxxxxxxxxx; Tian, Kevin; Lv, Zhiyuan; Niu, Bing; Song, Jike; daniel.vetter@xxxxxxxx; Cowperthwaite, David J; joonas.lahtinen@xxxxxxxxxxxxxxx Subject: Re: [RFCv3 10/15] drm/i915: update PDPs by condition when submit the LRC context On Fri, Mar 11, 2016 at 06:59:41PM +0800, Zhi Wang wrote: > Previously the PDPs inside the ring context will be updated > > - When populating a LRC context > - Before submitting a LRC context (only for 32 bit PPGTT, as the amount > of used PDPs may be changed during PPGTT page table grow) > > Under GVT-g, each VM owns a GVT context used as the shadow context. When > guest submits a context, GVT-g will load guest context into the GVT > context, and submit this context to i915 GEM submission system. > > So this GVT context could be used by different guest context, and the > PPGTT root pointer in guest contexts might be different as well, if guest > is using full PPGTT mode. > > In current i915, the root pointer in a LRC context will only be updated > during the LRC context creation. > > This patch postpones the root pointer upgrade to the time of submission, > which will give GVT-g a chance to reload a new PPGTT page table root > pointer into an existing GVT context. Not explained is why you cannot use the existing dirty flags. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
