i915_gem_evict.c revision 280183
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 <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/dev/drm2/i915/i915_gem_evict.c 280183 2015-03-17 18:50:33Z dumbbell $"); 31 32#include <dev/drm2/drmP.h> 33#include <dev/drm2/drm.h> 34#include <dev/drm2/i915/i915_drm.h> 35#include <dev/drm2/i915/i915_drv.h> 36 37static bool 38mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 39{ 40 if (obj->pin_count) 41 return false; 42 43 list_add(&obj->exec_list, unwind); 44 return drm_mm_scan_add_block(obj->gtt_space); 45} 46 47int 48i915_gem_evict_something(struct drm_device *dev, int min_size, 49 unsigned alignment, bool mappable) 50{ 51 drm_i915_private_t *dev_priv = dev->dev_private; 52 struct list_head eviction_list, unwind_list; 53 struct drm_i915_gem_object *obj; 54 int ret = 0; 55 56 CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size, 57 alignment, mappable); 58 59 /* 60 * The goal is to evict objects and amalgamate space in LRU order. 61 * The oldest idle objects reside on the inactive list, which is in 62 * retirement order. The next objects to retire are those on the (per 63 * ring) active list that do not have an outstanding flush. Once the 64 * hardware reports completion (the seqno is updated after the 65 * batchbuffer has been finished) the clean buffer objects would 66 * be retired to the inactive list. Any dirty objects would be added 67 * to the tail of the flushing list. So after processing the clean 68 * active objects we need to emit a MI_FLUSH to retire the flushing 69 * list, hence the retirement order of the flushing list is in 70 * advance of the dirty objects on the active lists. 71 * 72 * The retirement sequence is thus: 73 * 1. Inactive objects (already retired) 74 * 2. Clean active objects 75 * 3. Flushing list 76 * 4. Dirty active objects. 77 * 78 * On each list, the oldest objects lie at the HEAD with the freshest 79 * object on the TAIL. 80 */ 81 82 INIT_LIST_HEAD(&unwind_list); 83 if (mappable) 84 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size, 85 alignment, 0, 0, 86 dev_priv->mm.gtt_mappable_end); 87 else 88 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment, 0); 89 90 /* First see if there is a large enough contiguous idle region... */ 91 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 92 if (mark_free(obj, &unwind_list)) 93 goto found; 94 } 95 96 /* Now merge in the soon-to-be-expired objects... */ 97 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 98 /* Does the object require an outstanding flush? */ 99 if (obj->base.write_domain) 100 continue; 101 102 if (mark_free(obj, &unwind_list)) 103 goto found; 104 } 105 106 /* Finally add anything with a pending flush (in order of retirement) */ 107 list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) { 108 if (mark_free(obj, &unwind_list)) 109 goto found; 110 } 111 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 112 if (!obj->base.write_domain) 113 continue; 114 115 if (mark_free(obj, &unwind_list)) 116 goto found; 117 } 118 119 /* Nothing found, clean up and bail out! */ 120 while (!list_empty(&unwind_list)) { 121 obj = list_first_entry(&unwind_list, 122 struct drm_i915_gem_object, 123 exec_list); 124 125 ret = drm_mm_scan_remove_block(obj->gtt_space); 126 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret)); 127 128 list_del_init(&obj->exec_list); 129 } 130 131 /* We expect the caller to unpin, evict all and try again, or give up. 132 * So calling i915_gem_evict_everything() is unnecessary. 133 */ 134 return -ENOSPC; 135 136found: 137 /* drm_mm doesn't allow any other other operations while 138 * scanning, therefore store to be evicted objects on a 139 * temporary list. */ 140 INIT_LIST_HEAD(&eviction_list); 141 while (!list_empty(&unwind_list)) { 142 obj = list_first_entry(&unwind_list, 143 struct drm_i915_gem_object, 144 exec_list); 145 if (drm_mm_scan_remove_block(obj->gtt_space)) { 146 list_move(&obj->exec_list, &eviction_list); 147 drm_gem_object_reference(&obj->base); 148 continue; 149 } 150 list_del_init(&obj->exec_list); 151 } 152 153 /* Unbinding will emit any required flushes */ 154 while (!list_empty(&eviction_list)) { 155 obj = list_first_entry(&eviction_list, 156 struct drm_i915_gem_object, 157 exec_list); 158 if (ret == 0) 159 ret = i915_gem_object_unbind(obj); 160 161 list_del_init(&obj->exec_list); 162 drm_gem_object_unreference(&obj->base); 163 } 164 165 return ret; 166} 167 168int 169i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only) 170{ 171 drm_i915_private_t *dev_priv = dev->dev_private; 172 struct drm_i915_gem_object *obj, *next; 173 bool lists_empty; 174 int ret; 175 176 lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 177 list_empty(&dev_priv->mm.flushing_list) && 178 list_empty(&dev_priv->mm.active_list)); 179 if (lists_empty) 180 return -ENOSPC; 181 182 CTR2(KTR_DRM, "evict_everything %p %d", dev, purgeable_only); 183 184 /* The gpu_idle will flush everything in the write domain to the 185 * active list. Then we must move everything off the active list 186 * with retire requests. 187 */ 188 ret = i915_gpu_idle(dev); 189 if (ret) 190 return ret; 191 192 i915_gem_retire_requests(dev); 193 194 KASSERT(list_empty(&dev_priv->mm.flushing_list), 195 ("flush list not empty")); 196 197 /* Having flushed everything, unbind() should never raise an error */ 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 if (obj->pin_count == 0) 202 i915_gem_object_unbind(obj); 203 } 204 } 205 206 return 0; 207} 208