On Thu, May 15, 2014 at 01:14:54PM +0000, Mateo Lozano, Oscar wrote: > > > But looking at the code a better way should be: > > > 1. Create new bo, wrap it in a kms fb. > > > 2. Slap busy load onto that bo, e.g. reapeatedly fill it with the blitter. > > > 3. Enable evil interruptor (igt_fork_signal_helper). > > > 4. Submit pageflip > > > > > > -> Boom since the set_cache_level will block, get interrupted and exit > > > early with -EINTR. > > > > > > Given sufficient overkill in 2. this should be 100% reliable to reproduce. > > As soon as I execbuffer to the bo, it gets a vma for the GGTT vm: > > vm = ctx->vm; > if (!USES_FULL_PPGTT(dev)) > vm = &dev_priv->gtt.base; > > ... > > /* Look up object handles */ > ret = eb_lookup_vmas(eb, exec, args, vm, file); > if (ret) > goto err; > > And then it becomes impossible to reproduce the problem :( > Is there any other trick to make set_cache_level fail?
i915.ppgtt=2 should still make this blow up. The bug kinda doesn't exist without full ppgtt I think ... -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
