drm/amdgpu: minor PRT turnoff fix (v2)

When two VMs stop using PRT support at the same time we might
not disable it in the right order otherwise.

v2: agd: rebase

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index fa06b2a..2510d25 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1200,7 +1200,8 @@ static void amdgpu_vm_prt_cb(struct dma_fence *fence, struct dma_fence_cb *_cb)
 {
        struct amdgpu_prt_cb *cb = container_of(_cb, struct amdgpu_prt_cb, cb);
 
-       amdgpu_vm_update_prt_state(cb->adev);
+       if (atomic_dec_return(&cb->adev->vm_manager.num_prt_mappings) == 0)
+               amdgpu_vm_update_prt_state(cb->adev);
        kfree(cb);
 }
 
@@ -1219,17 +1220,14 @@ static void amdgpu_vm_free_mapping(struct amdgpu_device *adev,
                                   struct amdgpu_bo_va_mapping *mapping,
                                   struct dma_fence *fence)
 {
-       if ((mapping->flags & AMDGPU_PTE_PRT) &&
-           atomic_dec_return(&adev->vm_manager.num_prt_mappings) == 0) {
+       if (mapping->flags & AMDGPU_PTE_PRT) {
                struct amdgpu_prt_cb *cb = kmalloc(sizeof(struct amdgpu_prt_cb),
                                                   GFP_KERNEL);
 
                cb->adev = adev;
                if (!fence || dma_fence_add_callback(fence, &cb->cb,
-                                                    amdgpu_vm_prt_cb)) {
-                       amdgpu_vm_update_prt_state(adev);
-                       kfree(cb);
-               }
+                                                    amdgpu_vm_prt_cb))
+                       amdgpu_vm_prt_cb(fence, &cb->cb);
        }
        kfree(mapping);
 }