drivers/gpu/drm/i915/i915_gem_object.c

   1 /*
   2  * Copyright © 2017 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  */
  24
  25 #include "i915_drv.h"
  26 #include "i915_gem_object.h"
  27 #include "i915_globals.h"
  28
  29 static struct i915_global_object {
  30         struct i915_global base;
  31         struct kmem_cache *slab_objects;
  32 } global;
  33
  34 struct drm_i915_gem_object *i915_gem_object_alloc(void)
  35 {
  36         return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
  37 }
  38
  39 void i915_gem_object_free(struct drm_i915_gem_object *obj)
  40 {
  41         return kmem_cache_free(global.slab_objects, obj);
  42 }
  43
  44 /**
  45  * Mark up the object's coherency levels for a given cache_level
  46  * @obj: #drm_i915_gem_object
  47  * @cache_level: cache level
  48  */
  49 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
  50                                          unsigned int cache_level)
  51 {
  52         obj->cache_level = cache_level;
  53
  54         if (cache_level != I915_CACHE_NONE)
  55                 obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ |
  56                                        I915_BO_CACHE_COHERENT_FOR_WRITE);
  57         else if (HAS_LLC(to_i915(obj->base.dev)))
  58                 obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
  59         else
  60                 obj->cache_coherent = 0;
  61
  62         obj->cache_dirty =
  63                 !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
  64 }
  65
  66 static void i915_global_objects_shrink(void)
  67 {
  68         kmem_cache_shrink(global.slab_objects);
  69 }
  70
  71 static void i915_global_objects_exit(void)
  72 {
  73         kmem_cache_destroy(global.slab_objects);
  74 }
  75
  76 static struct i915_global_object global = { {
  77         .shrink = i915_global_objects_shrink,
  78         .exit = i915_global_objects_exit,
  79 } };
  80
  81 int __init i915_global_objects_init(void)
  82 {
  83         global.slab_objects =
  84                 KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
  85         if (!global.slab_objects)
  86                 return -ENOMEM;
  87
  88         i915_global_register(&global.base);
  89         return 0;
  90 }