Quoting Rob Herring (2019-06-10 18:04:40) > The midgard/bifrost GPUs need to allocate GPU memory which is allocated > on GPU page faults and not pinned in memory. The vendor driver calls > this functionality GROW_ON_GPF. > > This implementation assumes that BOs allocated with the > PANFROST_BO_NOMAP flag are never mmapped or exported. Both of those may > actually work, but I'm unsure if there's some interaction there. It > would cause the whole object to be pinned in memory which would defeat > the point of this. > > Issues/questions/thoughts: > > What's the difference between i_mapping and f_mapping? > > What kind of clean-up on close is needed? Based on vgem faults, there > doesn't seem to be any refcounting. Assume userspace is responsible for > not freeing the BO while a page fault can occur?
See drm_gem_vm_open and drm_gem_vm_close. -Chris _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
