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Existing implementation of GR de-init doesn't account for multiple instances of struct nvgpu_gr. As a fix, below changes are added. 1) nvgpu_gr_free is unified for VGPU as well as native. 2) All the GR instances are freed. 3) Appropriate NULL checks are added when freeing GR memories. 4) 2D, 3D, I2M and ZBC etc are explicitely disabled when MIG is set. 5) In ioctl_ctrl, checks are added to not return error when zbc is NULL for VGPU as requests are rerouted to RMserver. Jira NVGPU-6920 Change-Id: Icaa40f88f523c2cdbfe3a4fd6a55681ea7a83d12 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2578500 Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> Reviewed-by: Dinesh T <dt@nvidia.com> Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: Antony Clince Alex <aalex@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit