[PATCH 7.1 395/438] drm/amd/pm: hide pp_table sysfs on APUs

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yang Wang <[email protected]>

commit a65f5179d3f0c93da31b450aeb416eaa22f1912b upstream.

APUs use firmware-owned DPM tables and do not support replacement through
pp_table. Generic callbacks can nevertheless expose the sysfs file and
accept an upload before resetting the power management stack.

Treat pp_table as unsupported on APUs. Use the same platform check in the
get and set paths to hide the file and reject uploads.

Fixes: 289921b03fe5 ("drm/amd/powerplay: implement sysfs of pp_table for smu11 (v2)")
Signed-off-by: Yang Wang <[email protected]>
Reviewed-by: Kenneth Feng <[email protected]>
Reviewed-by: Asad Kamal <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
(cherry picked from commit 74f28db2db69777cd2f059d50fe34e365ddd5add)
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 drivers/gpu/drm/amd/pm/amdgpu_dpm.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -1183,6 +1183,13 @@ int amdgpu_dpm_dispatch_task(struct amdg
 	return ret;
 }
 
+static bool amdgpu_dpm_is_pp_table_allowed(struct amdgpu_device *adev)
+{
+	return !amdgpu_sriov_vf(adev) &&
+	       !(adev->flags & AMD_IS_APU) &&
+	       !adev->scpm_enabled;
+}
+
 int amdgpu_dpm_get_pp_table(struct amdgpu_device *adev, char *table,
 			    size_t size)
 {
@@ -1193,7 +1200,8 @@ int amdgpu_dpm_get_pp_table(struct amdgp
 	if ((!table && size) || (table && !size))
 		return -EINVAL;
 
-	if (amdgpu_sriov_vf(adev) || !pp_funcs->get_pp_table || adev->scpm_enabled)
+	if (!amdgpu_dpm_is_pp_table_allowed(adev) ||
+	    !pp_funcs->get_pp_table)
 		return -EOPNOTSUPP;
 
 	mutex_lock(&adev->pm.mutex);
@@ -1717,7 +1725,8 @@ int amdgpu_dpm_set_pp_table(struct amdgp
 	if (!buf || !size)
 		return -EINVAL;
 
-	if (amdgpu_sriov_vf(adev) || !pp_funcs->set_pp_table || adev->scpm_enabled)
+	if (!amdgpu_dpm_is_pp_table_allowed(adev) ||
+	    !pp_funcs->set_pp_table)
 		return -EOPNOTSUPP;
 
 	mutex_lock(&adev->pm.mutex);