[PATCH] drm/amdgpu: fix SI failure due to doorbells allocation

[Icenowy Zheng]

SI hardware does not have doorbells at all, however currently the code
will try to do the allocation and thus fail, makes SI AMDGPU not usable.

Fix this failure by skipping doorbells allocation when doorbells count
is zero.

Fixes: 54c30d2a8def ("drm/amdgpu: create kernel doorbell pages")
Signed-off-by: Icenowy Zheng <uwu at icenowy.me>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
index d0249ada91d30..599aece42017a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
@@ -142,6 +142,10 @@ int amdgpu_doorbell_create_kernel_doorbells(struct amdgpu_device *adev)
 	int r;
 	int size;
 
+	/* SI HW does not have doorbells, skip allocation */
+	if (adev->doorbell.num_kernel_doorbells == 0)
+		return 0;
+
 	/* Reserve first num_kernel_doorbells (page-aligned) for kernel ops */
 	size = ALIGN(adev->doorbell.num_kernel_doorbells * sizeof(u32), PAGE_SIZE);
 
-- 
2.39.1