1 /* 2 * Copyright © 2008-2010 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Eric Anholt <eric@anholt.net> 25 * Chris Wilson <chris@chris-wilson.co.uuk> 26 * 27 * $FreeBSD: src/sys/dev/drm2/i915/i915_gem_evict.c,v 1.1 2012/05/22 11:07:44 kib Exp $ 28 */ 29 30 #include <drm/drmP.h> 31 #include <drm/i915_drm.h> 32 #include "i915_drv.h" 33 34 static bool 35 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 36 { 37 if (obj->pin_count) 38 return false; 39 40 list_add(&obj->exec_list, unwind); 41 return drm_mm_scan_add_block(obj->gtt_space); 42 } 43 44 int 45 i915_gem_evict_something(struct drm_device *dev, int min_size, 46 unsigned alignment, bool mappable) 47 { 48 drm_i915_private_t *dev_priv = dev->dev_private; 49 struct list_head eviction_list, unwind_list; 50 struct drm_i915_gem_object *obj; 51 int ret = 0; 52 int cache_level = 0; 53 54 /* 55 * The goal is to evict objects and amalgamate space in LRU order. 56 * The oldest idle objects reside on the inactive list, which is in 57 * retirement order. The next objects to retire are those on the (per 58 * ring) active list that do not have an outstanding flush. Once the 59 * hardware reports completion (the seqno is updated after the 60 * batchbuffer has been finished) the clean buffer objects would 61 * be retired to the inactive list. Any dirty objects would be added 62 * to the tail of the flushing list. So after processing the clean 63 * active objects we need to emit a MI_FLUSH to retire the flushing 64 * list, hence the retirement order of the flushing list is in 65 * advance of the dirty objects on the active lists. 66 * 67 * The retirement sequence is thus: 68 * 1. Inactive objects (already retired) 69 * 2. Clean active objects 70 * 3. Flushing list 71 * 4. Dirty active objects. 72 * 73 * On each list, the oldest objects lie at the HEAD with the freshest 74 * object on the TAIL. 75 */ 76 77 INIT_LIST_HEAD(&unwind_list); 78 if (mappable) 79 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, 80 min_size, alignment, cache_level, 81 0, dev_priv->mm.gtt_mappable_end); 82 else 83 drm_mm_init_scan(&dev_priv->mm.gtt_space, 84 min_size, alignment, cache_level); 85 86 /* First see if there is a large enough contiguous idle region... */ 87 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 88 if (mark_free(obj, &unwind_list)) 89 goto found; 90 } 91 92 /* Now merge in the soon-to-be-expired objects... */ 93 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 94 if (mark_free(obj, &unwind_list)) 95 goto found; 96 } 97 98 /* Nothing found, clean up and bail out! */ 99 while (!list_empty(&unwind_list)) { 100 obj = list_first_entry(&unwind_list, 101 struct drm_i915_gem_object, 102 exec_list); 103 104 ret = drm_mm_scan_remove_block(obj->gtt_space); 105 BUG_ON(ret); 106 107 list_del_init(&obj->exec_list); 108 } 109 110 /* We expect the caller to unpin, evict all and try again, or give up. 111 * So calling i915_gem_evict_everything() is unnecessary. 112 */ 113 return -ENOSPC; 114 115 found: 116 /* drm_mm doesn't allow any other other operations while 117 * scanning, therefore store to be evicted objects on a 118 * temporary list. */ 119 INIT_LIST_HEAD(&eviction_list); 120 while (!list_empty(&unwind_list)) { 121 obj = list_first_entry(&unwind_list, 122 struct drm_i915_gem_object, 123 exec_list); 124 if (drm_mm_scan_remove_block(obj->gtt_space)) { 125 list_move(&obj->exec_list, &eviction_list); 126 drm_gem_object_reference(&obj->base); 127 continue; 128 } 129 list_del_init(&obj->exec_list); 130 } 131 132 /* Unbinding will emit any required flushes */ 133 while (!list_empty(&eviction_list)) { 134 obj = list_first_entry(&eviction_list, 135 struct drm_i915_gem_object, 136 exec_list); 137 if (ret == 0) 138 ret = i915_gem_object_unbind(obj); 139 140 list_del_init(&obj->exec_list); 141 drm_gem_object_unreference(&obj->base); 142 } 143 144 return ret; 145 } 146 147 int 148 i915_gem_evict_everything(struct drm_device *dev) 149 { 150 drm_i915_private_t *dev_priv = dev->dev_private; 151 struct drm_i915_gem_object *obj, *next; 152 bool lists_empty; 153 int ret; 154 155 lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 156 list_empty(&dev_priv->mm.active_list)); 157 if (lists_empty) 158 return -ENOSPC; 159 160 /* The gpu_idle will flush everything in the write domain to the 161 * active list. Then we must move everything off the active list 162 * with retire requests. 163 */ 164 ret = i915_gpu_idle(dev); 165 if (ret) 166 return ret; 167 168 i915_gem_retire_requests(dev); 169 170 /* Having flushed everything, unbind() should never raise an error */ 171 list_for_each_entry_safe(obj, next, 172 &dev_priv->mm.inactive_list, mm_list) 173 if (obj->pin_count == 0) 174 WARN_ON(i915_gem_object_unbind(obj)); 175 176 return 0; 177 } 178