mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-04 16:15:11 +00:00
Code Issues Releases Wiki Activity

amdgpu/pm: Make sysfs pm attributes as read-only for VFs

Browse source 
[ Upstream commit 11c9cc95f8 ]

== Description ==
Setting values of pm attributes through sysfs
should not be allowed in SRIOV mode.
These calls will not be processed by FW anyway,
but error handling on sysfs level should be improved.

== Changes ==
This patch prohibits performing of all set commands
in SRIOV mode on sysfs level.
It offers better error handling as calls that are
not allowed will not be propagated further.

== Test ==
Writing to any sysfs file in passthrough mode will succeed.
Writing to any sysfs file in ONEVF mode will yield error:
"calling process does not have sufficient permission to execute a command".

Signed-off-by: Marina Nikolic <Marina.Nikolic@amd.com>
Acked-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marina Nikolic 2021-12-14 20:57:53 +08:00 committed by Greg Kroah-Hartman
parent 493b879700
commit e4066c05d3
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/gpu/drm/amd/pm/amdgpu_pm.c
View file

@ -2117,6 +2117,12 @@ static int default_attr_update(struct amdgpu_device *adev, struct amdgpu_device_
}
}
/* setting should not be allowed from VF */
if (amdgpu_sriov_vf(adev)) {
dev_attr->attr.mode &= ~S_IWUGO;
dev_attr->store = NULL;
}
#undef DEVICE_ATTR_IS
return 0;