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 <drm/drmP.h>
  30 #include "i915_drv.h"
  31 #include <drm/i915_drm.h>
  32 #include "i915_trace.h"
  33
  34 static bool
  35 mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind)
  36 {
  37         struct drm_device *dev = obj->base.dev;
  38         struct drm_i915_private *dev_priv = dev->dev_private;
  39         struct i915_vma *vma = i915_gem_obj_to_vma(obj, &dev_priv->gtt.base);
  40
  41         if (obj->pin_count)
  42                 return false;
  43
  44         list_add(&obj->exec_list, unwind);
  45         return drm_mm_scan_add_block(&vma->node);
  46 }
  47
  48 int
  49 i915_gem_evict_something(struct drm_device *dev, int min_size,
  50                          unsigned alignment, unsigned cache_level,
  51                          bool mappable, bool nonblocking)
  52 {
  53         drm_i915_private_t *dev_priv = dev->dev_private;
  54         struct i915_address_space *vm = &dev_priv->gtt.base;
  55         struct list_head eviction_list, unwind_list;
  56         struct i915_vma *vma;
  57         struct drm_i915_gem_object *obj;
  58         int ret = 0;
  59
  60         trace_i915_gem_evict(dev, min_size, alignment, mappable);
  61
  62         /*
  63          * The goal is to evict objects and amalgamate space in LRU order.
  64          * The oldest idle objects reside on the inactive list, which is in
  65          * retirement order. The next objects to retire are those on the (per
  66          * ring) active list that do not have an outstanding flush. Once the
  67          * hardware reports completion (the seqno is updated after the
  68          * batchbuffer has been finished) the clean buffer objects would
  69          * be retired to the inactive list. Any dirty objects would be added
  70          * to the tail of the flushing list. So after processing the clean
  71          * active objects we need to emit a MI_FLUSH to retire the flushing
  72          * list, hence the retirement order of the flushing list is in
  73          * advance of the dirty objects on the active lists.
  74          *
  75          * The retirement sequence is thus:
  76          *   1. Inactive objects (already retired)
  77          *   2. Clean active objects
  78          *   3. Flushing list
  79          *   4. Dirty active objects.
  80          *
  81          * On each list, the oldest objects lie at the HEAD with the freshest
  82          * object on the TAIL.
  83          */
  84
  85         INIT_LIST_HEAD(&unwind_list);
  86         if (mappable)
  87                 drm_mm_init_scan_with_range(&vm->mm, min_size,
  88                                             alignment, cache_level, 0,
  89                                             dev_priv->gtt.mappable_end);
  90         else
  91                 drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
  92
  93         /* First see if there is a large enough contiguous idle region... */
  94         list_for_each_entry(obj, &vm->inactive_list, mm_list) {
  95                 if (mark_free(obj, &unwind_list))
  96                         goto found;
  97         }
  98
  99         if (nonblocking)
 100                 goto none;
 101
 102         /* Now merge in the soon-to-be-expired objects... */
 103         list_for_each_entry(obj, &vm->active_list, mm_list) {
 104                 if (mark_free(obj, &unwind_list))
 105                         goto found;
 106         }
 107
 108 none:
 109         /* Nothing found, clean up and bail out! */
 110         while (!list_empty(&unwind_list)) {
 111                 obj = list_first_entry(&unwind_list,
 112                                        struct drm_i915_gem_object,
 113                                        exec_list);
 114                 vma = i915_gem_obj_to_vma(obj, &dev_priv->gtt.base);
 115                 ret = drm_mm_scan_remove_block(&vma->node);
 116                 BUG_ON(ret);
 117
 118                 list_del_init(&obj->exec_list);
 119         }
 120
 121         /* We expect the caller to unpin, evict all and try again, or give up.
 122          * So calling i915_gem_evict_everything() is unnecessary.
 123          */
 124         return -ENOSPC;
 125
 126 found:
 127         /* drm_mm doesn't allow any other other operations while
 128          * scanning, therefore store to be evicted objects on a
 129          * temporary list. */
 130         INIT_LIST_HEAD(&eviction_list);
 131         while (!list_empty(&unwind_list)) {
 132                 obj = list_first_entry(&unwind_list,
 133                                        struct drm_i915_gem_object,
 134                                        exec_list);
 135                 vma = i915_gem_obj_to_vma(obj, &dev_priv->gtt.base);
 136                 if (drm_mm_scan_remove_block(&vma->node)) {
 137                         list_move(&obj->exec_list, &eviction_list);
 138                         drm_gem_object_reference(&obj->base);
 139                         continue;
 140                 }
 141                 list_del_init(&obj->exec_list);
 142         }
 143
 144         /* Unbinding will emit any required flushes */
 145         while (!list_empty(&eviction_list)) {
 146                 obj = list_first_entry(&eviction_list,
 147                                        struct drm_i915_gem_object,
 148                                        exec_list);
 149                 if (ret == 0)
 150                         ret = i915_gem_object_unbind(obj);
 151
 152                 list_del_init(&obj->exec_list);
 153                 drm_gem_object_unreference(&obj->base);
 154         }
 155
 156         return ret;
 157 }
 158
 159 int
 160 i915_gem_evict_everything(struct drm_device *dev)
 161 {
 162         drm_i915_private_t *dev_priv = dev->dev_private;
 163         struct i915_address_space *vm = &dev_priv->gtt.base;
 164         struct drm_i915_gem_object *obj, *next;
 165         bool lists_empty;
 166         int ret;
 167
 168         lists_empty = (list_empty(&vm->inactive_list) &&
 169                        list_empty(&vm->active_list));
 170         if (lists_empty)
 171                 return -ENOSPC;
 172
 173         trace_i915_gem_evict_everything(dev);
 174
 175         /* The gpu_idle will flush everything in the write domain to the
 176          * active list. Then we must move everything off the active list
 177          * with retire requests.
 178          */
 179         ret = i915_gpu_idle(dev);
 180         if (ret)
 181                 return ret;
 182
 183         i915_gem_retire_requests(dev);
 184
 185         /* Having flushed everything, unbind() should never raise an error */
 186         list_for_each_entry_safe(obj, next, &vm->inactive_list, mm_list)
 187                 if (obj->pin_count == 0)
 188                         WARN_ON(i915_gem_object_unbind(obj));
 189
 190         return 0;
 191 }