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 #include "i915_trace.h" 34 35 static bool 36 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 37 { 38 if (obj->pin_count) 39 return false; 40 41 list_add(&obj->exec_list, unwind); 42 return drm_mm_scan_add_block(obj->gtt_space); 43 } 44 45 int 46 i915_gem_evict_something(struct drm_device *dev, int min_size, 47 unsigned alignment, bool mappable) 48 { 49 drm_i915_private_t *dev_priv = dev->dev_private; 50 struct list_head eviction_list, unwind_list; 51 struct drm_i915_gem_object *obj; 52 int ret = 0; 53 54 trace_i915_gem_evict(dev, min_size, alignment, mappable); 55 56 /* 57 * The goal is to evict objects and amalgamate space in LRU order. 58 * The oldest idle objects reside on the inactive list, which is in 59 * retirement order. The next objects to retire are those on the (per 60 * ring) active list that do not have an outstanding flush. Once the 61 * hardware reports completion (the seqno is updated after the 62 * batchbuffer has been finished) the clean buffer objects would 63 * be retired to the inactive list. Any dirty objects would be added 64 * to the tail of the flushing list. So after processing the clean 65 * active objects we need to emit a MI_FLUSH to retire the flushing 66 * list, hence the retirement order of the flushing list is in 67 * advance of the dirty objects on the active lists. 68 * 69 * The retirement sequence is thus: 70 * 1. Inactive objects (already retired) 71 * 2. Clean active objects 72 * 3. Flushing list 73 * 4. Dirty active objects. 74 * 75 * On each list, the oldest objects lie at the HEAD with the freshest 76 * object on the TAIL. 77 */ 78 79 INIT_LIST_HEAD(&unwind_list); 80 if (mappable) 81 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, 82 min_size, alignment, 0, 83 0, dev_priv->mm.gtt_mappable_end); 84 else 85 drm_mm_init_scan(&dev_priv->mm.gtt_space, 86 min_size, alignment, 0); 87 88 /* First see if there is a large enough contiguous idle region... */ 89 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 90 if (mark_free(obj, &unwind_list)) 91 goto found; 92 } 93 94 /* Now merge in the soon-to-be-expired objects... */ 95 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 96 /* Does the object require an outstanding flush? */ 97 if (obj->base.write_domain) 98 continue; 99 100 if (mark_free(obj, &unwind_list)) 101 goto found; 102 } 103 104 /* Finally add anything with a pending flush (in order of retirement) */ 105 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) { 106 if (mark_free(obj, &unwind_list)) 107 goto found; 108 } 109 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 110 if (!obj->base.write_domain) 111 continue; 112 113 if (mark_free(obj, &unwind_list)) 114 goto found; 115 } 116 117 /* Nothing found, clean up and bail out! */ 118 while (!list_empty(&unwind_list)) { 119 obj = list_first_entry(&unwind_list, 120 struct drm_i915_gem_object, 121 exec_list); 122 123 ret = drm_mm_scan_remove_block(obj->gtt_space); 124 BUG_ON(ret); 125 126 list_del_init(&obj->exec_list); 127 } 128 129 /* We expect the caller to unpin, evict all and try again, or give up. 130 * So calling i915_gem_evict_everything() is unnecessary. 131 */ 132 return -ENOSPC; 133 134 found: 135 /* drm_mm doesn't allow any other other operations while 136 * scanning, therefore store to be evicted objects on a 137 * temporary list. */ 138 INIT_LIST_HEAD(&eviction_list); 139 while (!list_empty(&unwind_list)) { 140 obj = list_first_entry(&unwind_list, 141 struct drm_i915_gem_object, 142 exec_list); 143 if (drm_mm_scan_remove_block(obj->gtt_space)) { 144 list_move(&obj->exec_list, &eviction_list); 145 drm_gem_object_reference(&obj->base); 146 continue; 147 } 148 list_del_init(&obj->exec_list); 149 } 150 151 /* Unbinding will emit any required flushes */ 152 while (!list_empty(&eviction_list)) { 153 obj = list_first_entry(&eviction_list, 154 struct drm_i915_gem_object, 155 exec_list); 156 if (ret == 0) 157 ret = i915_gem_object_unbind(obj); 158 159 list_del_init(&obj->exec_list); 160 drm_gem_object_unreference(&obj->base); 161 } 162 163 return ret; 164 } 165 166 int 167 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) 168 { 169 drm_i915_private_t *dev_priv = dev->dev_private; 170 struct drm_i915_gem_object *obj, *next; 171 bool lists_empty; 172 int ret; 173 174 lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 175 list_empty(&dev_priv->mm.flushing_list) && 176 list_empty(&dev_priv->mm.active_list)); 177 if (lists_empty) 178 return -ENOSPC; 179 180 trace_i915_gem_evict_everything(dev, purgeable_only); 181 182 /* The gpu_idle will flush everything in the write domain to the 183 * active list. Then we must move everything off the active list 184 * with retire requests. 185 */ 186 ret = i915_gpu_idle(dev); 187 if (ret) 188 return ret; 189 190 i915_gem_retire_requests(dev); 191 192 BUG_ON(!list_empty(&dev_priv->mm.flushing_list)); 193 194 /* Having flushed everything, unbind() should never raise an error */ 195 list_for_each_entry_safe(obj, next, 196 &dev_priv->mm.inactive_list, mm_list) { 197 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) { 198 if (obj->pin_count == 0) 199 WARN_ON(i915_gem_object_unbind(obj)); 200 } 201 } 202 203 return 0; 204 } 205