sys/dev/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  * $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, true);
 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 }