[PATCH] drm/amdgpu: always flush the TLB on gfx8

[Christian König]

The TLB on GFX8 stores each block of 8 PTEs where any of the valid bits
are set.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 9596c22fded6..b747488c28ad 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -847,6 +847,11 @@ int amdgpu_vm_update_range(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 	flush_tlb |= adev->gmc.xgmi.num_physical_nodes &&
 		     adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 0);
 
+	/*
+	 * On GFX8 and older any 8 PTE block with a valid bit set enters the TLB
+	 */
+	flush_tlb |= adev->ip_versions[GC_HWIP][0] < IP_VERSION(9, 0, 0);
+
 	memset(&params, 0, sizeof(params));
 	params.adev = adev;
 	params.vm = vm;
-- 
2.25.1