From 11c9cc95f818f0f187e9b579a7f136f532b42445 Mon Sep 17 00:00:00 2001
From: Marina Nikolic <Marina.Nikolic@amd.com>
Date: Tue, 14 Dec 2021 20:57:53 +0800
Subject: [PATCH] amdgpu/pm: Make sysfs pm attributes as read-only for VFs
Git-commit: 11c9cc95f818f0f187e9b579a7f136f532b42445
Patch-mainline: v5.17-rc1
References: git-fixes

== 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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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 dfefb147ac2c..e2cae97f4ff1 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -2134,6 +2134,12 @@ 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;
-- 
2.31.1