Re: [PATCH 2/2] drm/vram-helper: Alternate between bottom-up and top-down placement

Hi,

At some point one has to choose to switch to top-down, and then back again at one of the next BOs. So the current patch effectively splits vram into a lower half and an upper half and puts BOs in alternating halves.

Hmm, so maybe just make the split explicit instead of playing tricks with top_bottom? Register the lower vram half as TT_VRAM, register the upper half as TT_PRIV. That'll make sure you never have a big allocation in the middle blocking things. Or maybe add a allocation strategy flag to ttm which effectively does the same.

take care, Gerd