[PATCH] drm/amdgpu : enable msix for amdgpu driver

[Liu, Shaoyun]

We might used out of the msi resources in some cloud project
which have a lot gpu devices(including PF and VF), msix can
provide enough resources from system level view

Change-Id: I9f03762074ac416c07f27b8f00c052ca93c7d6cb
Signed-off-by: shaoyunl <shaoyun.liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index d1d5e7f..1bd27ea 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -245,8 +245,9 @@ 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);
-		if (!ret) {
+		int nvec = pci_alloc_irq_vectors(adev->pdev, 1, pci_msix_vec_count(adev->pdev),
+					PCI_IRQ_MSI | PCI_IRQ_MSIX)
+		if (nvec > 0) {
 			adev->irq.msi_enabled = true;
 			dev_dbg(adev->dev, "amdgpu: using MSI.\n");
 		}
-- 
2.7.4