On Wed, 2021-11-10 at 09:50 -0500, Zack Rusin wrote: > TTM takes full control over TTM_PL_SYSTEM placed buffers. This makes > driver internal usage of TTM_PL_SYSTEM prone to errors because it > requires the drivers to manually handle all interactions between TTM > which can swap out those buffers whenever it thinks it's the right > thing to do and driver. > > CPU buffers which need to be fenced and shared with accelerators > should > be placed in driver specific placements that can explicitly handle > CPU/accelerator buffer fencing. > Currently, apart, from things silently failing nothing is enforcing > that requirement which means that it's easy for drivers and new > developers to get this wrong. To avoid the confusion we can document > this requirement and clarify the solution. > > This came up during a discussion on dri-devel: > https://lore.kernel.org/dri-devel/232f45e9-8748-1243-09bf-56763e6668b3@xxxxxxx Polite and gentle ping on that one. Are we ok with the wording here? z
