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Add support for powering off IGPU for switching between legacy to SMC mode/vice-versa or changing SMC configuration. The power off can be issued as follows echo 0 > /dev/nvgpu/igpu0/power The following steps are done during a poweroff. 1) Deterministic channel idle 2) Acquire write_lock on l->busy semaphore. 3) Wait till power_usage decrements to indicate 0 active jobs. 4) Invoke pm_runtime_put_sync_suspend() 5) Invoke nvgpu_gr_remove_support() to clear existing GR memory. 6) Release write_lock on l->busy 7) Deterministic channel unidle. Part of the sequence matches that of the gk20a_do_idle code. The common parts are extracted into new functions gk20a_block_new_jobs_and_idle() and gk20a_unblock_jobs() For joint-rail case, the current implementation, does a railgate and then sets pm_runtime_set_autosuspend_delay(-1) to disable regular runtime resume/suspend. Remove clearing of NVGPU_SUPPORT_MIG status during state change ias it leads to inconsistencies. Jira NVGPU-6920 Change-Id: I0b3eb3278176122ac061c1e8a94ebfb3c17c3925 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2578501 Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@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