src/gallium/winsys/drm/nouveau/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 "main/glheader.h"
  29 #include "glapi/glthread.h"
  30 #include <GL/internal/glcore.h>
  31
  32 #include "nouveau_context.h"
  33 #include "nouveau_screen.h"
  34
  35 _glthread_DECLARE_STATIC_MUTEX( lockMutex );
  36
  37 static void
  38 nouveau_contended_lock(struct nouveau_context *nv, GLuint flags)
  39 {
  40         __DRIdrawablePrivate *dPriv = nv->dri_drawable;
  41         __DRIscreenPrivate *sPriv = nv->dri_screen;
  42         struct nouveau_screen *nv_screen = nv->nv_screen;
  43         struct nouveau_device *dev = nv_screen->device;
  44         struct nouveau_device_priv *nvdev = nouveau_device(dev);
  45
  46         drmGetLock(nvdev->fd, nvdev->ctx, flags);
  47
  48         /* If the window moved, may need to set a new cliprect now.
  49          *
  50          * NOTE: This releases and regains the hw lock, so all state
  51          * checking must be done *after* this call:
  52          */
  53         if (dPriv)
  54                 DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);
  55 }
  56
  57 /* Lock the hardware and validate our state.
  58  */
  59 void
  60 LOCK_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         char __ret=0;
  66
  67         _glthread_LOCK_MUTEX(lockMutex);
  68         assert(!nv->locked);
  69
  70         DRM_CAS(nvdev->lock, nvdev->ctx,
  71                 (DRM_LOCK_HELD | nvdev->ctx), __ret);
  72
  73         if (__ret)
  74                 nouveau_contended_lock(nv, 0);
  75         nv->locked = GL_TRUE;
  76 }
  77
  78
  79   /* Unlock the hardware using the global current context
  80    */
  81 void
  82 UNLOCK_HARDWARE(struct nouveau_context *nv)
  83 {
  84         struct nouveau_screen *nv_screen = nv->nv_screen;
  85         struct nouveau_device *dev = nv_screen->device;
  86         struct nouveau_device_priv *nvdev = nouveau_device(dev);
  87
  88         assert(nv->locked);
  89         nv->locked = GL_FALSE;
  90
  91         DRM_UNLOCK(nvdev->fd, nvdev->lock, nvdev->ctx);
  92
  93         _glthread_UNLOCK_MUTEX(lockMutex);
  94 }