drm/amdgpu: add spin lock to protect freed list in vm (v2)

there is a protection fault about freed list when OCL test.
add a spin lock to protect it.

v2: drop changes in vm_fini

Signed-off-by: JimQu <jim.qu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

2 files changed, 15 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 670fefb56945..5a5f04d0902d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -956,6 +956,8 @@ struct amdgpu_vm {
         struct amdgpu_vm_id     ids[AMDGPU_MAX_RINGS];
         /* for interval tree */
         spinlock_t              it_lock;
+        /* protecting freed */
+        spinlock_t              freed_lock;
 };
 
 struct amdgpu_vm_manager {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index a582ef553499..b53d273eb7a1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -885,17 +885,21 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
         struct amdgpu_bo_va_mapping *mapping;
         int r;
 
+        spin_lock(&vm->freed_lock);
         while (!list_empty(&vm->freed)) {
                 mapping = list_first_entry(&vm->freed,
                         struct amdgpu_bo_va_mapping, list);
                 list_del(&mapping->list);
-
+                spin_unlock(&vm->freed_lock);
                 r = amdgpu_vm_bo_update_mapping(adev, vm, mapping, 0, 0, NULL);
                 kfree(mapping);
                 if (r)
                         return r;
 
+                spin_lock(&vm->freed_lock);
         }
+        spin_unlock(&vm->freed_lock);
+
         return 0;
 
 }
@@ -1155,10 +1159,13 @@ int amdgpu_vm_bo_unmap(struct amdgpu_device *adev,
         spin_unlock(&vm->it_lock);
         trace_amdgpu_vm_bo_unmap(bo_va, mapping);
 
-        if (valid)
+        if (valid) {
+                spin_lock(&vm->freed_lock);
                 list_add(&mapping->list, &vm->freed);
-        else
+                spin_unlock(&vm->freed_lock);
+        } else {
                 kfree(mapping);
+        }
 
         return 0;
 }
@@ -1191,7 +1198,9 @@ void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
                 interval_tree_remove(&mapping->it, &vm->va);
                 spin_unlock(&vm->it_lock);
                 trace_amdgpu_vm_bo_unmap(bo_va, mapping);
+                spin_lock(&vm->freed_lock);
                 list_add(&mapping->list, &vm->freed);
+                spin_unlock(&vm->freed_lock);
         }
         list_for_each_entry_safe(mapping, next, &bo_va->invalids, list) {
                 list_del(&mapping->list);
@@ -1252,6 +1261,7 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
         INIT_LIST_HEAD(&vm->cleared);
         INIT_LIST_HEAD(&vm->freed);
         spin_lock_init(&vm->it_lock);
+        spin_lock_init(&vm->freed_lock);
         pd_size = amdgpu_vm_directory_size(adev);
         pd_entries = amdgpu_vm_num_pdes(adev);