From 245f6963afe8aa3ace1b046c8d1a89cbca9d77a7 Mon Sep 17 00:00:00 2001
From: Philip Yang <Philip.Yang@amd.com>
Date: Tue, 10 May 2022 10:29:54 -0400
Subject: drm/amdgpu: vm flush needed after updating PDEs
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Git-commit: 5be323562c6a699d38430bc068a3fd192be8ed0d
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
If page table PDEs is evicted and restored, after updating PDEs, need
increase vm->tlb_seq, then amdgpu_vm_flush will flush TLB before command
submission.
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 40a8b52f44e6..2ceeaa4c793a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -706,6 +706,9 @@ int amdgpu_vm_update_pdes(struct amdgpu_device *adev,
if (r)
goto error;
+ /* vm_flush_needed after updating PDEs */
+ atomic64_inc(&vm->tlb_seq);
+
while (!list_empty(&vm->relocated)) {
entry = list_first_entry(&vm->relocated,
struct amdgpu_vm_bo_base,
--
2.38.1