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On certain platforms, not all copy engine instances are usable. The user shouldn't submit any work to these engines. To enforce this, remove these engines from active/host_engine list, this should ensure that these engines do not get advertised to userspace. In order to accomplish this introduce the following functions: - nvgpu_engine_remove_one_dev: This function removes the specified device entry from following device lists: fifo->host_engines, fifo->active_engines, runlist->rl_dev_list, runlist->eng_bitmask. Replace iteration over LCE device type entries using nvgpu_device_for_each(g, dev, NVGPU_DEVTYPE_LCE), along with this introduce macro nvgpu_device_for_each_safe. Introduce gpu_dbg_ce flag for CE debugging. Bug 3370462 Change-Id: I2e21f18363c6e53630d129da241c8fece106cd33 Signed-off-by: Antony Clince Alex <aalex@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2616711 Reviewed-by: Seema Khowala <seemaj@nvidia.com> Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit