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c0f4723339
The PMA unit can only access GPU VAs within a 4GB window, hence both the user allocated PMA buffer and the kernel allocated bytes available buffer should lie in the same 4GB window. This is accomplished by carving out and reserving a 4GB VA space in perbuf.vm and using fixed GPU VAs to ensure that both buffers are bound within the same 4GB window. In addition, update ALLOC_PMA_STREAM to use pma_buffer_offset, pma_buffer_map_size fields correctly. Bug 3503708 Change-Id: Ic5297a22c2db42b18ff5e676d565d3be3c1cd780 Signed-off-by: Antony Clince Alex <aalex@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2671637 Reviewed-by: svcacv <svcacv@nvidia.com> Reviewed-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com> GVS: Gerrit_Virtual_Submit