drivers/gpu/drm/i915/i915_gem_evict.c

   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         list_add(&obj->exec_list, unwind);
  39         drm_gem_object_reference(&obj->base);
  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, bool mappable)
  46 {
  47         drm_i915_private_t *dev_priv = dev->dev_private;
  48         struct list_head eviction_list, unwind_list;
  49         struct drm_i915_gem_object *obj;
  50         int ret = 0;
  51
  52         i915_gem_retire_requests(dev);
  53
  54         /* Re-check for free space after retiring requests */
  55         if (mappable) {
  56                 if (drm_mm_search_free_in_range(&dev_priv->mm.gtt_space,
  57                                                 min_size, alignment, 0,
  58                                                 dev_priv->mm.gtt_mappable_end,
  59                                                 0))
  60                         return 0;
  61         } else {
  62                 if (drm_mm_search_free(&dev_priv->mm.gtt_space,
  63                                        min_size, alignment, 0))
  64                         return 0;
  65         }
  66
  67         trace_i915_gem_evict(dev, min_size, alignment, mappable);
  68
  69         /*
  70          * The goal is to evict objects and amalgamate space in LRU order.
  71          * The oldest idle objects reside on the inactive list, which is in
  72          * retirement order. The next objects to retire are those on the (per
  73          * ring) active list that do not have an outstanding flush. Once the
  74          * hardware reports completion (the seqno is updated after the
  75          * batchbuffer has been finished) the clean buffer objects would
  76          * be retired to the inactive list. Any dirty objects would be added
  77          * to the tail of the flushing list. So after processing the clean
  78          * active objects we need to emit a MI_FLUSH to retire the flushing
  79          * list, hence the retirement order of the flushing list is in
  80          * advance of the dirty objects on the active lists.
  81          *
  82          * The retirement sequence is thus:
  83          *   1. Inactive objects (already retired)
  84          *   2. Clean active objects
  85          *   3. Flushing list
  86          *   4. Dirty active objects.
  87          *
  88          * On each list, the oldest objects lie at the HEAD with the freshest
  89          * object on the TAIL.
  90          */
  91
  92         INIT_LIST_HEAD(&unwind_list);
  93         if (mappable)
  94                 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
  95                                             alignment, 0,
  96                                             dev_priv->mm.gtt_mappable_end);
  97         else
  98                 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
  99
 100         /* First see if there is a large enough contiguous idle region... */
 101         list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
 102                 if (mark_free(obj, &unwind_list))
 103                         goto found;
 104         }
 105
 106         /* Now merge in the soon-to-be-expired objects... */
 107         list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
 108                 /* Does the object require an outstanding flush? */
 109                 if (obj->base.write_domain || obj->pin_count)
 110                         continue;
 111
 112                 if (mark_free(obj, &unwind_list))
 113                         goto found;
 114         }
 115
 116         /* Finally add anything with a pending flush (in order of retirement) */
 117         list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
 118                 if (obj->pin_count)
 119                         continue;
 120
 121                 if (mark_free(obj, &unwind_list))
 122                         goto found;
 123         }
 124         list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
 125                 if (! obj->base.write_domain || obj->pin_count)
 126                         continue;
 127
 128                 if (mark_free(obj, &unwind_list))
 129                         goto found;
 130         }
 131
 132         /* Nothing found, clean up and bail out! */
 133         while (!list_empty(&unwind_list)) {
 134                 obj = list_first_entry(&unwind_list,
 135                                        struct drm_i915_gem_object,
 136                                        exec_list);
 137
 138                 ret = drm_mm_scan_remove_block(obj->gtt_space);
 139                 BUG_ON(ret);
 140
 141                 list_del_init(&obj->exec_list);
 142                 drm_gem_object_unreference(&obj->base);
 143         }
 144
 145         /* We expect the caller to unpin, evict all and try again, or give up.
 146          * So calling i915_gem_evict_everything() is unnecessary.
 147          */
 148         return -ENOSPC;
 149
 150 found:
 151         /* drm_mm doesn't allow any other other operations while
 152          * scanning, therefore store to be evicted objects on a
 153          * temporary list. */
 154         INIT_LIST_HEAD(&eviction_list);
 155         while (!list_empty(&unwind_list)) {
 156                 obj = list_first_entry(&unwind_list,
 157                                        struct drm_i915_gem_object,
 158                                        exec_list);
 159                 if (drm_mm_scan_remove_block(obj->gtt_space)) {
 160                         list_move(&obj->exec_list, &eviction_list);
 161                         continue;
 162                 }
 163                 list_del_init(&obj->exec_list);
 164                 drm_gem_object_unreference(&obj->base);
 165         }
 166
 167         /* Unbinding will emit any required flushes */
 168         while (!list_empty(&eviction_list)) {
 169                 obj = list_first_entry(&eviction_list,
 170                                        struct drm_i915_gem_object,
 171                                        exec_list);
 172                 if (ret == 0)
 173                         ret = i915_gem_object_unbind(obj);
 174
 175                 list_del_init(&obj->exec_list);
 176                 drm_gem_object_unreference(&obj->base);
 177         }
 178
 179         return ret;
 180 }
 181
 182 int
 183 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
 184 {
 185         drm_i915_private_t *dev_priv = dev->dev_private;
 186         int ret;
 187         bool lists_empty;
 188
 189         lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
 190                        list_empty(&dev_priv->mm.flushing_list) &&
 191                        list_empty(&dev_priv->mm.active_list));
 192         if (lists_empty)
 193                 return -ENOSPC;
 194
 195         trace_i915_gem_evict_everything(dev, purgeable_only);
 196
 197         /* Flush everything (on to the inactive lists) and evict */
 198         ret = i915_gpu_idle(dev);
 199         if (ret)
 200                 return ret;
 201
 202         BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
 203
 204         return i915_gem_evict_inactive(dev, purgeable_only);
 205 }
 206
 207 /** Unbinds all inactive objects. */
 208 int
 209 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
 210 {
 211         drm_i915_private_t *dev_priv = dev->dev_private;
 212         struct drm_i915_gem_object *obj, *next;
 213
 214         list_for_each_entry_safe(obj, next,
 215                                  &dev_priv->mm.inactive_list, mm_list) {
 216                 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
 217                         int ret = i915_gem_object_unbind(obj);
 218                         if (ret)
 219                                 return ret;
 220                 }
 221         }
 222
 223         return 0;
 224 }