[PATCH] drm/amdgpu: sriov restrict max_pfn below AMDGPU_GMC_HOLE

[wentalou]

sriov need to restrict max_pfn below AMDGPU_GMC_HOLE.
access the hole results in a range fault interrupt IIRC.

Change-Id: I0add197a24a54388a128a545056e9a9f0330abfb
Signed-off-by: Wentao Lou <Wentao.Lou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c | 3 +--
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c   | 6 +++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
index dd3bd01..7e22be7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
@@ -26,8 +26,7 @@
 
 uint64_t amdgpu_csa_vaddr(struct amdgpu_device *adev)
 {
-	uint64_t addr = min(adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT,
-				AMDGPU_GMC_HOLE_START);
+	uint64_t addr = adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT;
 
 	addr -= AMDGPU_VA_RESERVED_SIZE;
 	addr = amdgpu_gmc_sign_extend(addr);
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 9c082f9..600259b 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -965,7 +965,11 @@ static int gmc_v9_0_sw_init(void *handle)
 		 * vm size is 256TB (48bit), maximum size of Vega10,
 		 * block size 512 (9bit)
 		 */
-		amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 48);
+		/* sriov restrict max_pfn below AMDGPU_GMC_HOLE */
+		if (amdgpu_sriov_vf(adev))
+			amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 47);
+		else
+			amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 48);
 		break;
 	default:
 		break;
-- 
2.7.4