From: Marina Nikolic Marina.Nikolic@amd.com

[ Upstream commit 11c9cc95f818f0f187e9b579a7f136f532b42445 ]

== 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 --- drivers/gpu/drm/amd/pm/amdgpu_pm.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c index 249cb0aeb5ae4..32a0fd5e84b73 100644 --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c @@ -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;