| /* |
| * Copyright © 2008-2010 Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| * |
| * Authors: |
| * Eric Anholt <eric@anholt.net> |
| * Chris Wilson <chris@chris-wilson.co.uuk> |
| * |
| */ |
| |
| #include "drmP.h" |
| #include "drm.h" |
| #include "i915_drv.h" |
| #include "i915_drm.h" |
| #include "i915_trace.h" |
| |
| static bool |
| mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) |
| { |
| if (obj->pin_count) |
| return false; |
| |
| list_add(&obj->exec_list, unwind); |
| return drm_mm_scan_add_block(obj->gtt_space); |
| } |
| |
| int |
| i915_gem_evict_something(struct drm_device *dev, int min_size, |
| unsigned alignment, bool mappable) |
| { |
| drm_i915_private_t *dev_priv = dev->dev_private; |
| struct list_head eviction_list, unwind_list; |
| struct drm_i915_gem_object *obj; |
| int ret = 0; |
| |
| trace_i915_gem_evict(dev, min_size, alignment, mappable); |
| |
| /* |
| * The goal is to evict objects and amalgamate space in LRU order. |
| * The oldest idle objects reside on the inactive list, which is in |
| * retirement order. The next objects to retire are those on the (per |
| * ring) active list that do not have an outstanding flush. Once the |
| * hardware reports completion (the seqno is updated after the |
| * batchbuffer has been finished) the clean buffer objects would |
| * be retired to the inactive list. Any dirty objects would be added |
| * to the tail of the flushing list. So after processing the clean |
| * active objects we need to emit a MI_FLUSH to retire the flushing |
| * list, hence the retirement order of the flushing list is in |
| * advance of the dirty objects on the active lists. |
| * |
| * The retirement sequence is thus: |
| * 1. Inactive objects (already retired) |
| * 2. Clean active objects |
| * 3. Flushing list |
| * 4. Dirty active objects. |
| * |
| * On each list, the oldest objects lie at the HEAD with the freshest |
| * object on the TAIL. |
| */ |
| |
| INIT_LIST_HEAD(&unwind_list); |
| if (mappable) |
| drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, |
| min_size, alignment, 0, |
| 0, dev_priv->mm.gtt_mappable_end); |
| else |
| drm_mm_init_scan(&dev_priv->mm.gtt_space, |
| min_size, alignment, 0); |
| |
| /* First see if there is a large enough contiguous idle region... */ |
| list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { |
| if (mark_free(obj, &unwind_list)) |
| goto found; |
| } |
| |
| /* Now merge in the soon-to-be-expired objects... */ |
| list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { |
| if (mark_free(obj, &unwind_list)) |
| goto found; |
| } |
| |
| /* Nothing found, clean up and bail out! */ |
| while (!list_empty(&unwind_list)) { |
| obj = list_first_entry(&unwind_list, |
| struct drm_i915_gem_object, |
| exec_list); |
| |
| ret = drm_mm_scan_remove_block(obj->gtt_space); |
| BUG_ON(ret); |
| |
| list_del_init(&obj->exec_list); |
| } |
| |
| /* We expect the caller to unpin, evict all and try again, or give up. |
| * So calling i915_gem_evict_everything() is unnecessary. |
| */ |
| return -ENOSPC; |
| |
| found: |
| /* drm_mm doesn't allow any other other operations while |
| * scanning, therefore store to be evicted objects on a |
| * temporary list. */ |
| INIT_LIST_HEAD(&eviction_list); |
| while (!list_empty(&unwind_list)) { |
| obj = list_first_entry(&unwind_list, |
| struct drm_i915_gem_object, |
| exec_list); |
| if (drm_mm_scan_remove_block(obj->gtt_space)) { |
| list_move(&obj->exec_list, &eviction_list); |
| drm_gem_object_reference(&obj->base); |
| continue; |
| } |
| list_del_init(&obj->exec_list); |
| } |
| |
| /* Unbinding will emit any required flushes */ |
| while (!list_empty(&eviction_list)) { |
| obj = list_first_entry(&eviction_list, |
| struct drm_i915_gem_object, |
| exec_list); |
| if (ret == 0) |
| ret = i915_gem_object_unbind(obj); |
| |
| list_del_init(&obj->exec_list); |
| drm_gem_object_unreference(&obj->base); |
| } |
| |
| return ret; |
| } |
| |
| int |
| i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) |
| { |
| drm_i915_private_t *dev_priv = dev->dev_private; |
| struct drm_i915_gem_object *obj, *next; |
| bool lists_empty; |
| int ret; |
| |
| lists_empty = (list_empty(&dev_priv->mm.inactive_list) && |
| list_empty(&dev_priv->mm.active_list)); |
| if (lists_empty) |
| return -ENOSPC; |
| |
| trace_i915_gem_evict_everything(dev, purgeable_only); |
| |
| /* The gpu_idle will flush everything in the write domain to the |
| * active list. Then we must move everything off the active list |
| * with retire requests. |
| */ |
| ret = i915_gpu_idle(dev); |
| if (ret) |
| return ret; |
| |
| i915_gem_retire_requests(dev); |
| |
| /* Having flushed everything, unbind() should never raise an error */ |
| list_for_each_entry_safe(obj, next, |
| &dev_priv->mm.inactive_list, mm_list) { |
| if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) { |
| if (obj->pin_count == 0) |
| WARN_ON(i915_gem_object_unbind(obj)); |
| } |
| } |
| |
| return 0; |
| } |