sys/dev/drm2/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 <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <dev/drm2/drmP.h>
  33 #include <dev/drm2/drm.h>
  34 #include <dev/drm2/i915/i915_drm.h>
  35 #include <dev/drm2/i915/i915_drv.h>
  36
  37 static bool
  38 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
  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
  53         CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size,
  54             alignment, mappable);
  55
  56         /*
  57          * The goal is to evict objects and amalgamate space in LRU order.
  58          * The oldest idle objects reside on the inactive list, which is in
  59          * retirement order. The next objects to retire are those on the (per
  60          * ring) active list that do not have an outstanding flush. Once the
  61          * hardware reports completion (the seqno is updated after the
  62          * batchbuffer has been finished) the clean buffer objects would
  63          * be retired to the inactive list. Any dirty objects would be added
  64          * to the tail of the flushing list. So after processing the clean
  65          * active objects we need to emit a MI_FLUSH to retire the flushing
  66          * list, hence the retirement order of the flushing list is in
  67          * advance of the dirty objects on the active lists.
  68          *
  69          * The retirement sequence is thus:
  70          *   1. Inactive objects (already retired)
  71          *   2. Clean active objects
  72          *   3. Flushing list
  73          *   4. Dirty active objects.
  74          *
  75          * On each list, the oldest objects lie at the HEAD with the freshest
  76          * object on the TAIL.
  77          */
  78
  79         INIT_LIST_HEAD(&unwind_list);
  80         if (mappable)
  81                 drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, min_size,
  82                                             alignment, 0,
  83                                             dev_priv->mm.gtt_mappable_end);
  84         else
  85                 drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
  86
  87         /* First see if there is a large enough contiguous idle region... */
  88         list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {
  89                 if (mark_free(obj, &unwind_list))
  90                         goto found;
  91         }
  92
  93         /* Now merge in the soon-to-be-expired objects... */
  94         list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
  95                 /* Does the object require an outstanding flush? */
  96                 if (obj->base.write_domain || obj->pin_count)
  97                         continue;
  98
  99                 if (mark_free(obj, &unwind_list))
 100                         goto found;
 101         }
 102
 103         /* Finally add anything with a pending flush (in order of retirement) */
 104         list_for_each_entry(obj, &dev_priv->mm.flushing_list, mm_list) {
 105                 if (obj->pin_count)
 106                         continue;
 107
 108                 if (mark_free(obj, &unwind_list))
 109                         goto found;
 110         }
 111         list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
 112                 if (!obj->base.write_domain || obj->pin_count)
 113                         continue;
 114
 115                 if (mark_free(obj, &unwind_list))
 116                         goto found;
 117         }
 118
 119         /* Nothing found, clean up and bail out! */
 120         while (!list_empty(&unwind_list)) {
 121                 obj = list_first_entry(&unwind_list,
 122                                        struct drm_i915_gem_object,
 123                                        exec_list);
 124
 125                 ret = drm_mm_scan_remove_block(obj->gtt_space);
 126                 KASSERT(ret == 0, ("drm_mm_scan_remove_block failed %d", ret));
 127
 128                 list_del_init(&obj->exec_list);
 129         }
 130
 131         /* We expect the caller to unpin, evict all and try again, or give up.
 132          * So calling i915_gem_evict_everything() is unnecessary.
 133          */
 134         return -ENOSPC;
 135
 136 found:
 137         /* drm_mm doesn't allow any other other operations while
 138          * scanning, therefore store to be evicted objects on a
 139          * temporary list. */
 140         INIT_LIST_HEAD(&eviction_list);
 141         while (!list_empty(&unwind_list)) {
 142                 obj = list_first_entry(&unwind_list,
 143                                        struct drm_i915_gem_object,
 144                                        exec_list);
 145                 if (drm_mm_scan_remove_block(obj->gtt_space)) {
 146                         list_move(&obj->exec_list, &eviction_list);
 147                         drm_gem_object_reference(&obj->base);
 148                         continue;
 149                 }
 150                 list_del_init(&obj->exec_list);
 151         }
 152
 153         /* Unbinding will emit any required flushes */
 154         while (!list_empty(&eviction_list)) {
 155                 obj = list_first_entry(&eviction_list,
 156                                        struct drm_i915_gem_object,
 157                                        exec_list);
 158                 if (ret == 0)
 159                         ret = i915_gem_object_unbind(obj);
 160
 161                 list_del_init(&obj->exec_list);
 162                 drm_gem_object_unreference(&obj->base);
 163         }
 164
 165         return ret;
 166 }
 167
 168 int
 169 i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
 170 {
 171         drm_i915_private_t *dev_priv = dev->dev_private;
 172         int ret;
 173         bool lists_empty;
 174
 175         lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
 176                        list_empty(&dev_priv->mm.flushing_list) &&
 177                        list_empty(&dev_priv->mm.active_list));
 178         if (lists_empty)
 179                 return -ENOSPC;
 180
 181         CTR2(KTR_DRM, "evict_everything %p %d", dev, purgeable_only);
 182
 183         /* Flush everything (on to the inactive lists) and evict */
 184         ret = i915_gpu_idle(dev, true);
 185         if (ret)
 186                 return ret;
 187
 188         KASSERT(list_empty(&dev_priv->mm.flushing_list),
 189             ("flush list not empty"));
 190
 191         return i915_gem_evict_inactive(dev, purgeable_only);
 192 }
 193
 194 /** Unbinds all inactive objects. */
 195 int
 196 i915_gem_evict_inactive(struct drm_device *dev, bool purgeable_only)
 197 {
 198         drm_i915_private_t *dev_priv = dev->dev_private;
 199         struct drm_i915_gem_object *obj, *next;
 200
 201         CTR2(KTR_DRM, "evict_inactive %p %d", dev, purgeable_only);
 202
 203         list_for_each_entry_safe(obj, next,
 204                                  &dev_priv->mm.inactive_list, mm_list) {
 205                 if (!purgeable_only || obj->madv != I915_MADV_WILLNEED) {
 206                         int ret = i915_gem_object_unbind(obj);
 207                         if (ret)
 208                                 return ret;
 209                 }
 210         }
 211
 212         return 0;
 213 }