Quoting Rogovin, Kevin (2017-12-13 11:19:10) > Hi, > > > Actually that's not strictly true. Since you only do a pread here, it will > > only synchronize against the last declared write to the bo. > > There's no guaranteed sync with the last batch for a set of read-only bo. > > Similarly, because of no domain tracking, it won't also ensure that the bo > > is cache coherent before the read back. > > Futz. Would then doing brw_bo_map() with flags having value MAP_READ be > sufficient then? This is what function > brw_get_buffer_subdata() of intel_buffer_objects.c does to copy BO contents > to application supplied buffer.
Yes. I would also pencil in a note to do a map_range, or at least MAP_INCOHERENT flag to avoid the gen_invalidate_range and do the cache invalidation manually (for !llc). -Chris _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
