[PATCH 3/3] drm/amdgpu: fix another fundamental VM bug

[Christian König]

From: Christian König <christian.koenig at amd.com>

I always wondered why this code uses the MC address. Now it came to me that
this is actually a bug and only works by coincident because we used to have
VRAM mapped at zero.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 +-
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index e4c5d31..ba6eb73 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -884,7 +884,7 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
 	}
 
 	if (p->job->vm) {
-		p->job->vm_pd_addr = amdgpu_bo_gpu_offset(vm->root.bo);
+		p->job->vm_pd_addr = vm->root.bo->tbo.mem.start << PAGE_SHIFT;
 
 		r = amdgpu_bo_vm_update_pte(p);
 		if (r)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b877f9f3..7256fcc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1012,7 +1012,7 @@ static int amdgpu_vm_update_level(struct amdgpu_device *adev,
 				return r;
 		}
 
-		pt = amdgpu_bo_gpu_offset(bo);
+		pt = bo->tbo.mem.start << PAGE_SHIFT;
 		if (parent->entries[pt_idx].addr == pt)
 			continue;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 047b1a7..63cb573 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -360,7 +360,7 @@ static uint64_t gmc_v9_0_get_vm_pte_flags(struct amdgpu_device *adev,
 
 static u64 gmc_v9_0_get_vm_pde(struct amdgpu_device *adev, u64 addr)
 {
-	addr = adev->vm_manager.vram_base_offset + addr - adev->mc.vram_start;
+	addr = adev->vm_manager.vram_base_offset + addr;
 	BUG_ON(addr & 0xFFFF00000000003FULL);
 	return addr;
 }
-- 
2.7.4