Allows us to gut a BO of it's backing store when the driver says that it
isn't needed any more.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c      | 15 ++++++++++++---
 drivers/gpu/drm/ttm/ttm_bo_util.c | 24 ++++++++++++++++++++++++
 include/drm/ttm/ttm_bo_driver.h   |  9 +++++++++
 3 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index ad142a92eb80..98e06f8bf23b 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -622,14 +622,23 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
 
        reservation_object_assert_held(bo->resv);
 
+       placement.num_placement = 0;
+       placement.num_busy_placement = 0;
+       bdev->driver->evict_flags(bo, &placement);
+
+       if (!placement.num_placement && !placement.num_busy_placement) {
+               ret = ttm_bo_pipeline_gutting(bo);
+               if (ret)
+                       return ret;
+
+               return ttm_tt_create(bo, false);
+       }
+
        evict_mem = bo->mem;
        evict_mem.mm_node = NULL;
        evict_mem.bus.io_reserved_vm = false;
        evict_mem.bus.io_reserved_count = 0;
 
-       placement.num_placement = 0;
-       placement.num_busy_placement = 0;
-       bdev->driver->evict_flags(bo, &placement);
        ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
        if (ret) {
                if (ret != -ERESTARTSYS) {
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c 
b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 6d6a3f46143b..1f730b3f18e5 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -801,3 +801,27 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
        return 0;
 }
 EXPORT_SYMBOL(ttm_bo_pipeline_move);
+
+int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
+{
+       struct ttm_buffer_object *ghost;
+       int ret;
+
+       ret = ttm_buffer_object_transfer(bo, &ghost);
+       if (ret)
+               return ret;
+
+       ret = reservation_object_copy_fences(ghost->resv, bo->resv);
+       /* Last resort, wait for the BO to be idle when we are OOM */
+       if (ret)
+               ttm_bo_wait(bo, false, false);
+
+       memset(&bo->mem, 0, sizeof(bo->mem));
+       bo->mem.mem_type = TTM_PL_SYSTEM;
+       bo->ttm = NULL;
+
+       ttm_bo_unreserve(ghost);
+       ttm_bo_unref(&ghost);
+
+       return 0;
+}
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index f8e2515b401f..39cd6b086d3a 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -849,6 +849,15 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
                         struct dma_fence *fence, bool evict,
                         struct ttm_mem_reg *new_mem);
 
+/**
+ * ttm_bo_pipeline_gutting.
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ *
+ * Pipelined gutting a BO of it's backing store.
+ */
+int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
+
 /**
  * ttm_io_prot
  *
-- 
2.14.1

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