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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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6
drivers/gpu/nvgpu/os/linux/pci.c
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@@ -696,6 +696,8 @@ static int nvgpu_pci_probe(struct pci_dev *pdev,
nvgpu_mutex_init(&l->dmabuf_priv_list_lock);
nvgpu_init_list_node(&l->dmabuf_priv_list);
g->probe_done = true;
return 0;
err_free_irq:
@@ -760,10 +762,6 @@ static void nvgpu_pci_remove(struct pci_dev *pdev)
nvgpu_thermal_deinit(g);
}
err = nvgpu_quiesce(g);
/* TODO: handle failure to idle */
WARN(err, "gpu failed to idle during driver removal");
nvgpu_free_irq(g);
nvgpu_remove(dev);