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gpu: nvgpu: add support for powering off gpu

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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
This commit is contained in:
Debarshi Dutta
2021-08-18 11:02:13 +05:30
committed by mobile promotions
parent 2e3c3aada6
commit 608decf1e6
9 changed files with 185 additions and 24 deletions
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9
drivers/gpu/nvgpu/os/linux/module.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2011-2021, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -21,6 +21,13 @@ struct nvgpu_os_linux;
int gk20a_pm_finalize_poweron(struct device *dev);
int nvgpu_finalize_poweron_linux(struct nvgpu_os_linux *l);
void gk20a_remove_support(struct gk20a *g);
/*
* This method is currently only supported to allow changing
* MIG configurations. As such only GR state and device nodes
* are freed as part of this. Any future functionality update
* can be made by adding more to this.
*/
int gk20a_driver_force_power_off(struct gk20a *g);
void gk20a_driver_start_unload(struct gk20a *g);
int nvgpu_quiesce(struct gk20a *g);
int nvgpu_remove(struct device *dev);