Am 18.09.2017 um 08:11 schrieb Monk Liu:
> From: Horace Chen <horace.chen at amd.com>
>
> Kernel will set the PCI power state to UNKNOWN after unloading,
> Since SRIOV has faked PCI config space so the UNKNOWN state
> will be kept forever.
>
> In driver reload if the power state is UNKNOWN then enabling msi
> will fail.
>
> forcely set it to D0 for SRIOV to fix this kernel flawness.
>
> Change-Id: I6a72d5fc9b653b21c3c98167515a511c5edeb91c
> Signed-off-by: Horace Chen <horace.chen at amd.com>
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
Acked-by: Christian König <christian.koenig at amd.com>, but better wait
for Alex to have a look as well on this before pushing it.
Christian.
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> index 914c5bf..345406a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
> @@ -229,7 +229,15 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
> adev->irq.msi_enabled = false;
>
> if (amdgpu_msi_ok(adev)) {
> - int ret = pci_enable_msi(adev->pdev);
> + int ret;
> + if (amdgpu_sriov_vf(adev) &&
> + adev->pdev->current_state == PCI_UNKNOWN){
> + /* If pci power state is unknown on the SRIOV platform,
> + * it may be set in the remove device. We need to forcely
> + * set it to D0 to enable the msi*/
> + adev->pdev->current_state = PCI_D0;
> + }
> + ret = pci_enable_msi(adev->pdev);
> if (!ret) {
> adev->irq.msi_enabled = true;
> dev_info(adev->dev, "amdgpu: using MSI.\n");
