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path: root/drivers/gpu/drm/drm_gem_vram_helper.c
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Diffstat (limited to 'drivers/gpu/drm/drm_gem_vram_helper.c')
-rw-r--r--drivers/gpu/drm/drm_gem_vram_helper.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 02ca22e90290..0b232a73c1b7 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -387,9 +387,16 @@ static int drm_gem_vram_kmap_locked(struct drm_gem_vram_object *gbo,
if (gbo->vmap_use_count > 0)
goto out;
- ret = ttm_bo_vmap(&gbo->bo, &gbo->map);
- if (ret)
- return ret;
+ /*
+ * VRAM helpers unmap the BO only on demand. So the previous
+ * page mapping might still be around. Only vmap if the there's
+ * no mapping present.
+ */
+ if (dma_buf_map_is_null(&gbo->map)) {
+ ret = ttm_bo_vmap(&gbo->bo, &gbo->map);
+ if (ret)
+ return ret;
+ }
out:
++gbo->vmap_use_count;
@@ -577,6 +584,7 @@ static void drm_gem_vram_bo_driver_move_notify(struct drm_gem_vram_object *gbo,
return;
ttm_bo_vunmap(bo, &gbo->map);
+ dma_buf_map_clear(&gbo->map); /* explicitly clear mapping for next vmap call */
}
static int drm_gem_vram_bo_driver_move(struct drm_gem_vram_object *gbo,