drivers/gpu/drm/nouveau/nouveau_ttm.c

   1 /*
   2  * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA,
   3  * All Rights Reserved.
   4  * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA,
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include "drmP.h"
  28
  29 #include "nouveau_drv.h"
  30
  31 static struct vm_operations_struct nouveau_ttm_vm_ops;
  32 static const struct vm_operations_struct *ttm_vm_ops;
  33
  34 static int
  35 nouveau_ttm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  36 {
  37         struct ttm_buffer_object *bo = vma->vm_private_data;
  38         int ret;
  39
  40         if (unlikely(bo == NULL))
  41                 return VM_FAULT_NOPAGE;
  42
  43         ret = ttm_vm_ops->fault(vma, vmf);
  44         return ret;
  45 }
  46
  47 int
  48 nouveau_ttm_mmap(struct file *filp, struct vm_area_struct *vma)
  49 {
  50         struct drm_file *file_priv = filp->private_data;
  51         struct drm_nouveau_private *dev_priv =
  52                 file_priv->minor->dev->dev_private;
  53         int ret;
  54
  55         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
  56                 return drm_mmap(filp, vma);
  57
  58         ret = ttm_bo_mmap(filp, vma, &dev_priv->ttm.bdev);
  59         if (unlikely(ret != 0))
  60                 return ret;
  61
  62         if (unlikely(ttm_vm_ops == NULL)) {
  63                 ttm_vm_ops = vma->vm_ops;
  64                 nouveau_ttm_vm_ops = *ttm_vm_ops;
  65                 nouveau_ttm_vm_ops.fault = &nouveau_ttm_fault;
  66         }
  67
  68         vma->vm_ops = &nouveau_ttm_vm_ops;
  69         return 0;
  70 }
  71
  72 static int
  73 nouveau_ttm_mem_global_init(struct ttm_global_reference *ref)
  74 {
  75         return ttm_mem_global_init(ref->object);
  76 }
  77
  78 static void
  79 nouveau_ttm_mem_global_release(struct ttm_global_reference *ref)
  80 {
  81         ttm_mem_global_release(ref->object);
  82 }
  83
  84 int
  85 nouveau_ttm_global_init(struct drm_nouveau_private *dev_priv)
  86 {
  87         struct ttm_global_reference *global_ref;
  88         int ret;
  89
  90         global_ref = &dev_priv->ttm.mem_global_ref;
  91         global_ref->global_type = TTM_GLOBAL_TTM_MEM;
  92         global_ref->size = sizeof(struct ttm_mem_global);
  93         global_ref->init = &nouveau_ttm_mem_global_init;
  94         global_ref->release = &nouveau_ttm_mem_global_release;
  95
  96         ret = ttm_global_item_ref(global_ref);
  97         if (unlikely(ret != 0)) {
  98                 DRM_ERROR("Failed setting up TTM memory accounting\n");
  99                 dev_priv->ttm.mem_global_ref.release = NULL;
 100                 return ret;
 101         }
 102
 103         dev_priv->ttm.bo_global_ref.mem_glob = global_ref->object;
 104         global_ref = &dev_priv->ttm.bo_global_ref.ref;
 105         global_ref->global_type = TTM_GLOBAL_TTM_BO;
 106         global_ref->size = sizeof(struct ttm_bo_global);
 107         global_ref->init = &ttm_bo_global_init;
 108         global_ref->release = &ttm_bo_global_release;
 109
 110         ret = ttm_global_item_ref(global_ref);
 111         if (unlikely(ret != 0)) {
 112                 DRM_ERROR("Failed setting up TTM BO subsystem\n");
 113                 ttm_global_item_unref(&dev_priv->ttm.mem_global_ref);
 114                 dev_priv->ttm.mem_global_ref.release = NULL;
 115                 return ret;
 116         }
 117
 118         return 0;
 119 }
 120
 121 void
 122 nouveau_ttm_global_release(struct drm_nouveau_private *dev_priv)
 123 {
 124         if (dev_priv->ttm.mem_global_ref.release == NULL)
 125                 return;
 126
 127         ttm_global_item_unref(&dev_priv->ttm.bo_global_ref.ref);
 128         ttm_global_item_unref(&dev_priv->ttm.mem_global_ref);
 129         dev_priv->ttm.mem_global_ref.release = NULL;
 130 }
 131