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drm/amdgpu: improve error handling in pcie_bw

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1. Initialize the counters to 0 in case the callback
   fails to initialize them.
2. The counters don't exist on APUs so return an error
   for them.
3. Return an error if the callback doesn't exist.

Reviewed-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-By: Kent Russell <kent.russell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2020-05-19 16:54:55 -04:00
parent f7646585a3
commit d08d692ebb
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@ -1646,9 +1646,15 @@ static ssize_t amdgpu_get_pcie_bw(struct device *dev,
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct amdgpu_device *adev = ddev->dev_private;
uint64_t count0, count1;
uint64_t count0 = 0, count1 = 0;
int ret;
if (adev->flags & AMD_IS_APU)
return -ENODATA;
if (!adev->asic_funcs->get_pcie_usage)
return -ENODATA;
ret = pm_runtime_get_sync(ddev->dev);
if (ret < 0)
return ret;