6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: ZhenGuo Yin <zhenguo.yin@xxxxxxx>
commit 5659b0c93a1ea02c662a030b322093203f299185 upstream.
[Why]
Page table of compute VM in the VRAM will lost after gpu reset.
VRAM won't be restored since compute VM has no shadows.
[How]
Use higher 32-bit of vm->generation to record a vram_lost_counter.
Reset the VM state machine when vm->genertaion is not equal to
the new generation token.
v2: Check vm->generation instead of calling drm_sched_entity_error
in amdgpu_vm_validate.
v3: Use new generation token instead of vram_lost_counter for check.
Signed-off-by: ZhenGuo Yin <zhenguo.yin@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
(cherry picked from commit 47c0388b0589cb481c294dcb857d25a214c46eb3)
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -418,7 +418,7 @@ uint64_t amdgpu_vm_generation(struct amd
if (!vm)
return result;
- result += vm->generation;
+ result += lower_32_bits(vm->generation);
/* Add one if the page tables will be re-generated on next CS */
if (drm_sched_entity_error(&vm->delayed))
++result;
@@ -443,13 +443,14 @@ int amdgpu_vm_validate_pt_bos(struct amd
int (*validate)(void *p, struct amdgpu_bo *bo),
void *param)
{
+ uint64_t new_vm_generation = amdgpu_vm_generation(adev, vm);
struct amdgpu_vm_bo_base *bo_base;
struct amdgpu_bo *shadow;
struct amdgpu_bo *bo;
int r;
- if (drm_sched_entity_error(&vm->delayed)) {
- ++vm->generation;
+ if (vm->generation != new_vm_generation) {
+ vm->generation = new_vm_generation;
amdgpu_vm_bo_reset_state_machine(vm);
amdgpu_vm_fini_entities(vm);
r = amdgpu_vm_init_entities(adev, vm);
@@ -2192,7 +2193,7 @@ int amdgpu_vm_init(struct amdgpu_device
vm->last_update = dma_fence_get_stub();
vm->last_unlocked = dma_fence_get_stub();
vm->last_tlb_flush = dma_fence_get_stub();
- vm->generation = 0;
+ vm->generation = amdgpu_vm_generation(adev, NULL);
mutex_init(&vm->eviction_lock);
vm->evicting = false;
