43 	 * Note that we also hit this path for the scratch page, and for this  in alloc_pt_lmem()
166 	if (vm->scratch[0]->base.resv == &vm->_resv) {  in i915_vm_lock_objects()
167 		return i915_gem_object_lock(vm->scratch[0], ww);  in i915_vm_lock_objects()
171 		/* We borrowed the scratch page from ggtt, take the top level object */  in i915_vm_lock_objects()
316 static void poison_scratch_page(struct drm_i915_gem_object *scratch)  in poison_scratch_page()  argument
318 	void *vaddr = __px_vaddr(scratch);  in poison_scratch_page()
325 	memset(vaddr, val, scratch->base.size);  in poison_scratch_page()
326 	drm_clflush_virt_range(vaddr, scratch->base.size);  in poison_scratch_page()
335 	 * need to support a 64K scratch page, given that every 16th entry for a  in setup_scratch_page()
337 	 * region, including any PTEs which happen to point to scratch.  in setup_scratch_page()
341 	 * scratch (read-only) between all vm, we create one 64k scratch page  in setup_scratch_page()
359 		/* We need a single contiguous page for our scratch */  in setup_scratch_page()
368 		 * Use a non-zero scratch page for debugging.  in setup_scratch_page()
378 		vm->scratch[0] = obj;  in setup_scratch_page()
394 		 * operating in 64K GTT mode, which includes any scratch PTEs,  in setup_scratch_page()
408 	if (!vm->scratch[0])  in free_scratch()
412 		i915_gem_object_put(vm->scratch[i]);  in free_scratch()