src/gallium/winsys/g3dvl/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 <pthread.h>
  29 #include <driclient.h>
  30 #include "nouveau_context.h"
  31 #include "nouveau_screen.h"
  32
  33 static pthread_mutex_t lockMutex = PTHREAD_MUTEX_INITIALIZER;
  34
  35 static void
  36 nouveau_contended_lock(struct nouveau_context *nv, unsigned int flags)
  37 {
  38         dri_drawable_t                  *dri_drawable = nv->dri_drawable;
  39         dri_screen_t                    *dri_screen = nv->dri_context->dri_screen;
  40         struct nouveau_screen           *nv_screen = nv->nv_screen;
  41         struct nouveau_device           *dev = nv_screen->device;
  42         struct nouveau_device_priv      *nvdev = nouveau_device(dev);
  43
  44         drmGetLock(nvdev->fd, nvdev->ctx, flags);
  45
  46         /* If the window moved, may need to set a new cliprect now.
  47          *
  48          * NOTE: This releases and regains the hw lock, so all state
  49          * checking must be done *after* this call:
  50          */
  51         if (dri_drawable)
  52                 DRI_VALIDATE_DRAWABLE_INFO(dri_screen, dri_drawable);
  53 }
  54
  55 /* Lock the hardware and validate our state.
  56  */
  57 void
  58 LOCK_HARDWARE(struct nouveau_context *nv)
  59 {
  60         struct nouveau_screen           *nv_screen = nv->nv_screen;
  61         struct nouveau_device           *dev = nv_screen->device;
  62         struct nouveau_device_priv      *nvdev = nouveau_device(dev);
  63         char                            __ret=0;
  64
  65         pthread_mutex_lock(&lockMutex);
  66         assert(!nv->locked);
  67
  68         DRM_CAS(nvdev->lock, nvdev->ctx,
  69                 (DRM_LOCK_HELD | nvdev->ctx), __ret);
  70
  71         if (__ret)
  72                 nouveau_contended_lock(nv, 0);
  73         nv->locked = 1;
  74 }
  75
  76
  77 /* Unlock the hardware using the global current context
  78  */
  79 void
  80 UNLOCK_HARDWARE(struct nouveau_context *nv)
  81 {
  82         struct nouveau_screen           *nv_screen = nv->nv_screen;
  83         struct nouveau_device           *dev = nv_screen->device;
  84         struct nouveau_device_priv      *nvdev = nouveau_device(dev);
  85
  86         assert(nv->locked);
  87         nv->locked = 0;
  88
  89         DRM_UNLOCK(nvdev->fd, nvdev->lock, nvdev->ctx);
  90
  91         pthread_mutex_unlock(&lockMutex);
  92 }