Fix evict_mutex locking range.

Implement unmappable buffers. (fault moves them to mappable when needed).
Various bugfixes.

1 files changed, 24 insertions, 0 deletions

diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index 5afa9800..4a41e761 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -746,6 +746,30 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
 
 	mutex_lock(&bo->mutex);
 
+	/*
+	 * If buffer happens to be in a non-mappable location,
+	 * move it to a mappable.
+	 */
+
+	if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) {
+		uint32_t mask_save = bo->mem.mask;
+		uint32_t new_mask = bo->mem.mask | 
+			DRM_BO_FLAG_MAPPABLE | 
+			DRM_BO_FLAG_FORCE_MAPPABLE;
+
+		err = drm_bo_move_buffer(bo, new_mask, 0, 0);
+		bo->mem.mask = mask_save;
+		
+		if (!err)
+			err = drm_bo_wait(bo, 0, 0, 0);
+
+		if (err) {
+			data->type = (err == -EAGAIN) ? 
+				VM_FAULT_MINOR : VM_FAULT_SIGBUS;
+			goto out_unlock;
+		}
+	}
+	
 	if (address > vma->vm_end) {
 		data->type = VM_FAULT_SIGBUS;
 		goto out_unlock;