src/gallium/winsys/drm/nouveau/common/nouveau_lock.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * 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
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <pipe/p_thread.h>
  29 #include "nouveau_context.h"
  30 #include "nouveau_screen.h"
  31
  32 pipe_static_mutex(lockMutex);
  33
  34 /* Lock the hardware and validate our state.
  35  */
  36 void
  37 LOCK_HARDWARE(struct nouveau_context *nv)
  38 {
  39         struct nouveau_screen *nv_screen = nv->nv_screen;
  40         struct nouveau_device *dev = nv_screen->device;
  41         struct nouveau_device_priv *nvdev = nouveau_device(dev);
  42         char __ret=0;
  43
  44         assert(!nv->locked);
  45         pipe_mutex_lock(lockMutex);
  46
  47         DRM_CAS(nvdev->lock, nvdev->ctx,
  48                 (DRM_LOCK_HELD | nvdev->ctx), __ret);
  49
  50         if (__ret) {
  51                 drmGetLock(nvdev->fd, nvdev->ctx, 0);
  52                 nouveau_contended_lock(nv);
  53         }
  54         nv->locked = 1;
  55 }
  56
  57 /* Unlock the hardware using the global current context
  58  */
  59 void
  60 UNLOCK_HARDWARE(struct nouveau_context *nv)
  61 {
  62         struct nouveau_screen *nv_screen = nv->nv_screen;
  63         struct nouveau_device *dev = nv_screen->device;
  64         struct nouveau_device_priv *nvdev = nouveau_device(dev);
  65
  66         assert(nv->locked);
  67         nv->locked = 0;
  68
  69         DRM_UNLOCK(nvdev->fd, nvdev->lock, nvdev->ctx);
  70
  71         pipe_mutex_unlock(lockMutex);
  72 }