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