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 "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 }