1 files changed, 99 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 296e985d0b65..b67e94e25cfc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1613,6 +1613,105 @@ int amdgpu_vm_bo_unmap(struct amdgpu_device *adev,
 }
 
 /**
+ * amdgpu_vm_bo_clear_mappings - remove all mappings in a specific range
+ *
+ * @adev: amdgpu_device pointer
+ * @vm: VM structure to use
+ * @saddr: start of the range
+ * @size: size of the range
+ *
+ * Remove all mappings in a range, split them as appropriate.
+ * Returns 0 for success, error for failure.
+ */
+int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev,
+                                struct amdgpu_vm *vm,
+                                uint64_t saddr, uint64_t size)
+{
+        struct amdgpu_bo_va_mapping *before, *after, *tmp, *next;
+        struct interval_tree_node *it;
+        LIST_HEAD(removed);
+        uint64_t eaddr;
+
+        eaddr = saddr + size - 1;
+        saddr /= AMDGPU_GPU_PAGE_SIZE;
+        eaddr /= AMDGPU_GPU_PAGE_SIZE;
+
+        /* Allocate all the needed memory */
+        before = kzalloc(sizeof(*before), GFP_KERNEL);
+        if (!before)
+                return -ENOMEM;
+
+        after = kzalloc(sizeof(*after), GFP_KERNEL);
+        if (!after) {
+                kfree(before);
+                return -ENOMEM;
+        }
+
+        /* Now gather all removed mappings */
+        it = interval_tree_iter_first(&vm->va, saddr, eaddr);
+        while (it) {
+                tmp = container_of(it, struct amdgpu_bo_va_mapping, it);
+                it = interval_tree_iter_next(it, saddr, eaddr);
+
+                /* Remember mapping split at the start */
+                if (tmp->it.start < saddr) {
+                        before->it.start = tmp->it.start;;
+                        before->it.last = saddr - 1;
+                        before->offset = tmp->offset;
+                        before->flags = tmp->flags;
+                        list_add(&before->list, &tmp->list);
+                }
+
+                /* Remember mapping split at the end */
+                if (tmp->it.last > eaddr) {
+                        after->it.start = eaddr + 1;
+                        after->it.last = tmp->it.last;
+                        after->offset = tmp->offset;
+                        after->offset += after->it.start - tmp->it.start;
+                        after->flags = tmp->flags;
+                        list_add(&after->list, &tmp->list);
+                }
+
+                list_del(&tmp->list);
+                list_add(&tmp->list, &removed);
+        }
+
+        /* And free them up */
+        list_for_each_entry_safe(tmp, next, &removed, list) {
+                interval_tree_remove(&tmp->it, &vm->va);
+                list_del(&tmp->list);
+
+                if (tmp->it.start < saddr)
+                    tmp->it.start = saddr;
+                if (tmp->it.last > eaddr)
+                    tmp->it.last = eaddr;
+
+                list_add(&tmp->list, &vm->freed);
+                trace_amdgpu_vm_bo_unmap(NULL, tmp);
+        }
+
+        /* Insert partial mapping before the range*/
+        if (before->it.start != before->it.last) {
+                interval_tree_insert(&before->it, &vm->va);
+                if (before->flags & AMDGPU_PTE_PRT)
+                        amdgpu_vm_prt_get(adev);
+        } else {
+                kfree(before);
+        }
+
+        /* Insert partial mapping after the range */
+        if (after->it.start != after->it.last) {
+                interval_tree_insert(&after->it, &vm->va);
+                if (after->flags & AMDGPU_PTE_PRT)
+                        amdgpu_vm_prt_get(adev);
+        } else {
+                kfree(after);
+        }
+
+        return 0;
+}
+
+/**
  * amdgpu_vm_bo_rmv - remove a bo to a specific vm
  *
  * @adev: amdgpu_device pointer