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The simulator ring buffer DMA interface supports buffers of the following sizes: 4, 8, 12 and 16K. At present, it is configured to 4K and it happens to match with the kernel PAGE_SIZE, which is used to wrap back the GET/PUT pointers once 4K is reached. However, this is not always true; for instance, take 64K pages. Hence, replace PAGE_SIZE with SIM_BFR_SIZE. Introduce macro NVGPU_CPU_PAGE_SIZE which aliases to PAGE_SIZE and replace latter with former. Bug 200658101 Jira NVGPU-6018 Change-Id: I83cc62b87291734015c51f3e5a98173549e065de Signed-off-by: Antony Clince Alex <aalex@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2420728 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>