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