98N/A * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. 761N/A * Copyright (c) 2008-2010, 2013 Intel Corporation 98N/A * Permission is hereby granted, free of charge, to any person obtaining a 98N/A * copy of this software and associated documentation files (the "Software"), 98N/A * to deal in the Software without restriction, including without limitation 98N/A * the rights to use, copy, modify, merge, publish, distribute, sublicense, 98N/A * and/or sell copies of the Software, and to permit persons to whom the 98N/A * Software is furnished to do so, subject to the following conditions: 98N/A * The above copyright notice and this permission notice (including the next 98N/A * paragraph) shall be included in all copies or substantial portions of the 98N/A * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 98N/A * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 98N/A * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 98N/A * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 98N/A * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 98N/A * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 98N/A * Eric Anholt <eric@anholt.net> 98N/A * Chris Wilson <chris@chris-wilson.co.uuk> 98N/A * The goal is to evict objects and amalgamate space in LRU order. 761N/A * The oldest idle objects reside on the inactive list, which is in 559N/A * retirement order. The next objects to retire are those on the (per 559N/A * ring) active list that do not have an outstanding flush. Once the 761N/A * hardware reports completion (the seqno is updated after the 761N/A * batchbuffer has been finished) the clean buffer objects would 98N/A * be retired to the inactive list. Any dirty objects would be added 98N/A * to the tail of the flushing list. So after processing the clean 810N/A * active objects we need to emit a MI_FLUSH to retire the flushing 810N/A * list, hence the retirement order of the flushing list is in 761N/A * advance of the dirty objects on the active lists. * The retirement sequence is thus: * 1. Inactive objects (already retired) * 2. Clean active objects * 4. Dirty active objects. * On each list, the oldest objects lie at the HEAD with the freshest /* First see if there is a large enough contiguous idle region... */ /* Now merge in the soon-to-be-expired objects... */ /* Nothing found, clean up and bail out! */ /* We expect the caller to unpin, evict all and try again, or give up. * So calling i915_gem_evict_everything() is unnecessary. /* drm_mm doesn't allow any other other operations while * scanning, therefore store to be evicted objects on a /* Unbinding will emit any required flushes */ /* The gpu_idle will flush everything in the write domain to the * active list. Then we must move everything off the active list /* Having flushed everything, unbind() should never raise an error */