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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
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/nvgpu/os/linux/power_ops.c
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@@ -34,8 +34,10 @@
#include "platform_gk20a.h"
#include "os_linux.h"
#include "module.h"
#define NVGPU_DRIVER_POWER_ON_NEEDED 1
#define NVGPU_DRIVER_POWER_OFF_NEEDED 0
int gk20a_power_open(struct inode *inode, struct file *filp)
{
@@ -117,9 +119,8 @@ int gk20a_power_write(struct file *filp, const char __user *buf,
}
if (power_status == NVGPU_DRIVER_POWER_ON_NEEDED) {
if ((g->power_on_state == NVGPU_STATE_POWERING_ON) ||
(g->power_on_state == NVGPU_STATE_POWERED_ON)) {
goto free_input;
if (nvgpu_poweron_started(g)) {
goto free_input;
}
err = gk20a_busy(g);
@@ -130,8 +131,15 @@ int gk20a_power_write(struct file *filp, const char __user *buf,
}
gk20a_idle(g);
} else if (power_status == NVGPU_DRIVER_POWER_OFF_NEEDED) {
err = gk20a_driver_force_power_off(g);
if (err) {
nvgpu_err(g, "power_node_write failed at busy");
kfree(userinput);
return -EINVAL;
}
} else {
nvgpu_err(g, "1 is the valid value to power-on the GPU");
nvgpu_err(g, "1/0 are the valid values to power-on the GPU");
kfree(userinput);
return -EINVAL;
}