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 */ 28 29 #include "drmP.h" 30 #include "drm.h" 31 #include "i915_drv.h" 32 #include "i915_drm.h" 33 34 static bool 35 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 36 { 37 list_add(&obj->exec_list, unwind); 38 drm_gem_object_reference(&obj->base); 39 return drm_mm_scan_add_block(obj->gtt_space); 40 } 41 42 int 43 i915_gem_evict_something(struct drm_device *dev, int min_size, 44 unsigned alignment, bool mappable) 45 { 46 drm_i915_private_t *dev_priv = dev->dev_private; 47 struct list_head eviction_list, unwind_list; 48 struct drm_i915_gem_object *obj; 49 int ret = 0; 50 51 i915_gem_retire_requests(dev); 52 53 /* Re-check for free space after retiring requests */ 54 if (mappable) { 55 if (drm_mm_search_free_in_range(&dev_priv->mm.gtt_space, 56 min_size, alignment, 0, 57 dev_priv->mm.gtt_mappable_end, 58 0)) 59 return 0; 60 } else { 61 if (drm_mm_search_free(&dev_priv->mm.gtt_space, 62 min_size, alignment, 0)) 63 return 0; 64 } 65 66 /* 67 * The goal is to evict objects and amalgamate space in LRU order. 68 * The oldest idle objects reside on the inactive list, which is in 69 * retirement order. The next objects to retire are those on the (per 70 * ring) active list that do not have an outstanding flush. Once the 71 * hardware reports completion (the seqno is updated after the 72 * batchbuffer has been finished) the clean buffer objects would 73 * be retired to the inactive list. Any dirty objects would be added 74 * to the tail of the flushing list. So after processing the clean 75 * active objects we need to emit a MI_FLUSH to retire the flushing 76 * list, hence the retirement order of the flushing list is in 77 * advance of the dirty objects on the active lists. 78 * 79 * The retirement sequence is thus: 80 * 1. Inactive objects (already retired) 81 * 2. Clean active objects 82 * 3. Flushing list 83 * 4. Dirty active objects. 84 * 85 * On each list, the oldest objects lie at the HEAD with the freshest 86 * object on the TAIL. 87 */ 88 89 INIT_LIST_HEAD(&unwind_list); 90 if (mappable) 91 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size, 92 alignment, 0, 93 dev_priv->mm.gtt_mappable_end); 94 else 95 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment); 96 97 /* First see if there is a large enough contiguous idle region... */ 98 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 99 if (mark_free(obj, &unwind_list)) 100 goto found; 101 } 102 103 /* Now merge in the soon-to-be-expired objects... */ 104 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 105 /* Does the object require an outstanding flush? */ 106 if (obj->base.write_domain || obj->pin_count) 107 continue; 108 109 if (mark_free(obj, &unwind_list)) 110 goto found; 111 } 112 113 /* Finally add anything with a pending flush (in order of retirement) */ 114 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) { 115 if (obj->pin_count) 116 continue; 117 118 if (mark_free(obj, &unwind_list)) 119 goto found; 120 } 121 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 122 if (! obj->base.write_domain || obj->pin_count) 123 continue; 124 125 if (mark_free(obj, &unwind_list)) 126 goto found; 127 } 128 129 /* Nothing found, clean up and bail out! */ 130 while (!list_empty(&unwind_list)) { 131 obj = list_first_entry(&unwind_list, 132 struct drm_i915_gem_object, 133 exec_list); 134 135 ret = drm_mm_scan_remove_block(obj->gtt_space); 136 BUG_ON(ret); 137 138 list_del_init(&obj->exec_list); 139 drm_gem_object_unreference(&obj->base); 140 } 141 142 /* We expect the caller to unpin, evict all and try again, or give up. 143 * So calling i915_gem_evict_everything() is unnecessary. 144 */ 145 return -ENOSPC; 146 147 found: 148 /* drm_mm doesn't allow any other other operations while 149 * scanning, therefore store to be evicted objects on a 150 * temporary list. */ 151 INIT_LIST_HEAD(&eviction_list); 152 while (!list_empty(&unwind_list)) { 153 obj = list_first_entry(&unwind_list, 154 struct drm_i915_gem_object, 155 exec_list); 156 if (drm_mm_scan_remove_block(obj->gtt_space)) { 157 list_move(&obj->exec_list, &eviction_list); 158 continue; 159 } 160 list_del_init(&obj->exec_list); 161 drm_gem_object_unreference(&obj->base); 162 } 163 164 /* Unbinding will emit any required flushes */ 165 while (!list_empty(&eviction_list)) { 166 obj = list_first_entry(&eviction_list, 167 struct drm_i915_gem_object, 168 exec_list); 169 if (ret == 0) 170 ret = i915_gem_object_unbind(obj); 171 172 list_del_init(&obj->exec_list); 173 drm_gem_object_unreference(&obj->base); 174 } 175 176 return ret; 177 } 178 179 int 180 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) 181 { 182 drm_i915_private_t *dev_priv = dev->dev_private; 183 int ret; 184 bool lists_empty; 185 186 lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 187 list_empty(&dev_priv->mm.flushing_list) && 188 list_empty(&dev_priv->mm.active_list)); 189 if (lists_empty) 190 return -ENOSPC; 191 192 /* Flush everything (on to the inactive lists) and evict */ 193 ret = i915_gpu_idle(dev); 194 if (ret) 195 return ret; 196 197 BUG_ON(!list_empty(&dev_priv->mm.flushing_list)); 198 199 return i915_gem_evict_inactive(dev, purgeable_only); 200 } 201 202 /** Unbinds all inactive objects. */ 203 int 204 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only) 205 { 206 drm_i915_private_t *dev_priv = dev->dev_private; 207 struct drm_i915_gem_object *obj, *next; 208 209 list_for_each_entry_safe(obj, next, 210 &dev_priv->mm.inactive_list, mm_list) { 211 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) { 212 int ret = i915_gem_object_unbind(obj); 213 if (ret) 214 return ret; 215 } 216 } 217 218 return 0; 219 } 220