Starting from DG2 we will have resizable BAR support for device local-memory, but in some cases the final BAR size might still be smaller than the total local-memory size. In such cases only part of local-memory will be CPU accessible, while the remainder is only accessible via the GPU. This series adds the basic enablers needed to ensure that the entire local-memory range is usable. Patches 1-3 are taken directly from Arun' in-progress series[1], which reworks part of the allocator, and for example, allows us to allocate memory within a sub-range, and is needed when allocating mappable memory. These patches are only included here for the benefit of CI testing. [1] https://patchwork.freedesktop.org/series/98979/ -- 2.34.1
