When error (negative value) with int type is returned from read/write
fops (gk20a_power_node_ops) is read as ssize_t value as expected in
userspace it will be seen as large non-negative number and will
suppress the error.
Make return type for these fops ssize_t.
Also include power_ops.h in power_ops.c. This would have caught the
type mismatch issue.
Bug 3388725
Change-Id: Ie66b0178b31a1b7d147b4f441884bbba3bd2e4d8
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2604342
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String parameter to kstrtouint has to be null terminated.
If the input string to gk20a_power_write doesn't have the
terminating null character then gk20a_power_write passed
string without appending null character to kstrtouint.
Fix this by preparing string to occupy null character in
the end after user supplied string characters.
Bug 3388725
Change-Id: I521f879326908e296dd9a32b5781db490d40bdd2
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2603985
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Martin Radev <mradev@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
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GVS: Gerrit_Virtual_Submit
When SMC modes are enabled, devices are created with sudo-only
access permissions. Those permissions are relaxed to allow non-sudo
processes to allow job submission.
Also, allow only root users to poweroff explicitely via the device
power node.
Bug 3374078
Change-Id: Ieb869399c3ada3588708cf2bc99a580414023cb7
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2590584
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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>
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Tested-by: Antony Clince Alex <aalex@nvidia.com>
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GVS: Gerrit_Virtual_Submit
- This is deferring the dev_nodes creation after power_on to
select the MIG config and to create the dev_nodes as per the
selected MIG config.
- The patch is adding a device node to issue power on. The
nodes are:
for igpu :/dev/nvgpu/igpu0/power
for dgpu:/dev/nvgpu/dgpu-0001:01:00.0/power
To issue power on :
echo "1" > /dev/nvgpu/igpu0/power
echo "1" > /dev/nvgpu/dgpu-0001:01:00.0/power
JIRA NVGPU-6633
Change-Id: Ic4f1f3e42724cc788dcfaf0e881d188fd3bd1ce1
Signed-off-by: dt <dt@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2512647
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