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 /* Does the object require an outstanding flush? */ 95 if (obj->base.write_domain || obj->pin_count) 96 continue; 97 98 if (mark_free(obj, &unwind_list)) 99 goto found; 100 } 101 102 /* Finally add anything with a pending flush (in order of retirement) */ 103 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) { 104 if (obj->pin_count) 105 continue; 106 107 if (mark_free(obj, &unwind_list)) 108 goto found; 109 } 110 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 111 if (!obj->base.write_domain || obj->pin_count) 112 continue; 113 114 if (mark_free(obj, &unwind_list)) 115 goto found; 116 } 117 118 /* Nothing found, clean up and bail out! */ 119 while (!list_empty(&unwind_list)) { 120 obj = list_first_entry(&unwind_list, 121 struct drm_i915_gem_object, 122 exec_list); 123 124 ret = drm_mm_scan_remove_block(obj->gtt_space); 125 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret)); 126 127 list_del_init(&obj->exec_list); 128 } 129 130 /* We expect the caller to unpin, evict all and try again, or give up. 131 * So calling i915_gem_evict_everything() is unnecessary. 132 */ 133 return -ENOSPC; 134 135 found: 136 /* drm_mm doesn't allow any other other operations while 137 * scanning, therefore store to be evicted objects on a 138 * temporary list. */ 139 INIT_LIST_HEAD(&eviction_list); 140 while (!list_empty(&unwind_list)) { 141 obj = list_first_entry(&unwind_list, 142 struct drm_i915_gem_object, 143 exec_list); 144 if (drm_mm_scan_remove_block(obj->gtt_space)) { 145 list_move(&obj->exec_list, &eviction_list); 146 drm_gem_object_reference(&obj->base); 147 continue; 148 } 149 list_del_init(&obj->exec_list); 150 } 151 152 /* Unbinding will emit any required flushes */ 153 while (!list_empty(&eviction_list)) { 154 obj = list_first_entry(&eviction_list, 155 struct drm_i915_gem_object, 156 exec_list); 157 if (ret == 0) 158 ret = i915_gem_object_unbind(obj); 159 160 list_del_init(&obj->exec_list); 161 drm_gem_object_unreference(&obj->base); 162 } 163 164 return ret; 165 } 166 167 int 168 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) 169 { 170 drm_i915_private_t *dev_priv = dev->dev_private; 171 int ret; 172 bool lists_empty; 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 /* Flush everything (on to the inactive lists) and evict */ 181 ret = i915_gpu_idle(dev); 182 if (ret) 183 return ret; 184 185 KASSERT(list_empty(&dev_priv->mm.flushing_list), 186 ("flush list not empty")); 187 188 return i915_gem_evict_inactive(dev, purgeable_only); 189 } 190 191 /** Unbinds all inactive objects. */ 192 int 193 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only) 194 { 195 drm_i915_private_t *dev_priv = dev->dev_private; 196 struct drm_i915_gem_object *obj, *next; 197 198 list_for_each_entry_safe(obj, next, 199 &dev_priv->mm.inactive_list, mm_list) { 200 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) { 201 int ret = i915_gem_object_unbind(obj); 202 if (ret) 203 return ret; 204 } 205 } 206 207 return 0; 208 } 209