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