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 <drm/drmP.h> 30 #include <drm/i915_drm.h> 31 #include "i915_drv.h" 32 33 static bool 34 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 35 { 36 if (obj->pin_count) 37 return false; 38 39 list_add(&obj->exec_list, unwind); 40 return drm_mm_scan_add_block(obj->gtt_space); 41 } 42 43 int 44 i915_gem_evict_something(struct drm_device *dev, int min_size, 45 unsigned alignment, unsigned cache_level, 46 bool mappable, bool nonblocking) 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 53 /* 54 * The goal is to evict objects and amalgamate space in LRU order. 55 * The oldest idle objects reside on the inactive list, which is in 56 * retirement order. The next objects to retire are those on the (per 57 * ring) active list that do not have an outstanding flush. Once the 58 * hardware reports completion (the seqno is updated after the 59 * batchbuffer has been finished) the clean buffer objects would 60 * be retired to the inactive list. Any dirty objects would be added 61 * to the tail of the flushing list. So after processing the clean 62 * active objects we need to emit a MI_FLUSH to retire the flushing 63 * list, hence the retirement order of the flushing list is in 64 * advance of the dirty objects on the active lists. 65 * 66 * The retirement sequence is thus: 67 * 1. Inactive objects (already retired) 68 * 2. Clean active objects 69 * 3. Flushing list 70 * 4. Dirty active objects. 71 * 72 * On each list, the oldest objects lie at the HEAD with the freshest 73 * object on the TAIL. 74 */ 75 76 INIT_LIST_HEAD(&unwind_list); 77 if (mappable) 78 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, 79 min_size, alignment, cache_level, 80 0, dev_priv->mm.gtt_mappable_end); 81 else 82 drm_mm_init_scan(&dev_priv->mm.gtt_space, 83 min_size, alignment, cache_level); 84 85 /* First see if there is a large enough contiguous idle region... */ 86 list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 87 if (mark_free(obj, &unwind_list)) 88 goto found; 89 } 90 91 if (nonblocking) 92 goto none; 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 if (mark_free(obj, &unwind_list)) 97 goto found; 98 } 99 100 none: 101 /* Nothing found, clean up and bail out! */ 102 while (!list_empty(&unwind_list)) { 103 obj = list_first_entry(&unwind_list, 104 struct drm_i915_gem_object, 105 exec_list); 106 107 ret = drm_mm_scan_remove_block(obj->gtt_space); 108 BUG_ON(ret); 109 110 list_del_init(&obj->exec_list); 111 } 112 113 /* We expect the caller to unpin, evict all and try again, or give up. 114 * So calling i915_gem_evict_everything() is unnecessary. 115 */ 116 return -ENOSPC; 117 118 found: 119 /* drm_mm doesn't allow any other other operations while 120 * scanning, therefore store to be evicted objects on a 121 * temporary list. */ 122 INIT_LIST_HEAD(&eviction_list); 123 while (!list_empty(&unwind_list)) { 124 obj = list_first_entry(&unwind_list, 125 struct drm_i915_gem_object, 126 exec_list); 127 if (drm_mm_scan_remove_block(obj->gtt_space)) { 128 list_move(&obj->exec_list, &eviction_list); 129 drm_gem_object_reference(&obj->base); 130 continue; 131 } 132 list_del_init(&obj->exec_list); 133 } 134 135 /* Unbinding will emit any required flushes */ 136 while (!list_empty(&eviction_list)) { 137 obj = list_first_entry(&eviction_list, 138 struct drm_i915_gem_object, 139 exec_list); 140 if (ret == 0) 141 ret = i915_gem_object_unbind(obj); 142 143 list_del_init(&obj->exec_list); 144 drm_gem_object_unreference(&obj->base); 145 } 146 147 return ret; 148 } 149 150 int 151 i915_gem_evict_everything(struct drm_device *dev) 152 { 153 drm_i915_private_t *dev_priv = dev->dev_private; 154 struct drm_i915_gem_object *obj, *next; 155 bool lists_empty; 156 int ret; 157 158 lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 159 list_empty(&dev_priv->mm.active_list)); 160 if (lists_empty) 161 return -ENOSPC; 162 163 /* The gpu_idle will flush everything in the write domain to the 164 * active list. Then we must move everything off the active list 165 * with retire requests. 166 */ 167 ret = i915_gpu_idle(dev); 168 if (ret) 169 return ret; 170 171 i915_gem_retire_requests(dev); 172 173 /* Having flushed everything, unbind() should never raise an error */ 174 list_for_each_entry_safe(obj, next, 175 &dev_priv->mm.inactive_list, mm_list) 176 if (obj->pin_count == 0) 177 WARN_ON(i915_gem_object_unbind(obj)); 178 179 return 0; 180 } 181