src/gallium/winsys/drm/intel/dri/intel_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
  29 #include "main/glheader.h"
  30 #include "pipe/p_thread.h"
  31 #include <GL/internal/glcore.h>
  32 #include "state_tracker/st_public.h"
  33 #include "intel_context.h"
  34 #include "i830_dri.h"
  35
  36
  37
  38 pipe_static_mutex( lockMutex );
  39
  40
  41 static void
  42 intelContendedLock(struct intel_context *intel, uint flags)
  43 {
  44    __DRIdrawablePrivate *dPriv = intel->driDrawable;
  45    __DRIscreenPrivate *sPriv = intel->driScreen;
  46    struct intel_screen *intelScreen = intel_screen(sPriv);
  47    drmI830Sarea *sarea = intel->sarea;
  48
  49    drmGetLock(intel->driFd, intel->hHWContext, flags);
  50
  51    DBG(LOCK, "%s - got contended lock\n", __progname);
  52
  53    /* If the window moved, may need to set a new cliprect now.
  54     *
  55     * NOTE: This releases and regains the hw lock, so all state
  56     * checking must be done *after* this call:
  57     */
  58    if (dPriv)
  59       DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);
  60
  61    if (sarea->width != intelScreen->front.width ||
  62        sarea->height != intelScreen->front.height) {
  63
  64       intelUpdateScreenRotation(sPriv, sarea);
  65    }
  66 }
  67
  68
  69 /* Lock the hardware and validate our state.
  70  */
  71 void LOCK_HARDWARE( struct intel_context *intel )
  72 {
  73     char __ret = 0;
  74
  75     pipe_mutex_lock(lockMutex);
  76     assert(!intel->locked);
  77
  78     DRM_CAS(intel->driHwLock, intel->hHWContext,
  79             (DRM_LOCK_HELD|intel->hHWContext), __ret);
  80
  81     if (__ret)
  82        intelContendedLock( intel, 0 );
  83
  84     DBG(LOCK, "%s - locked\n", __progname);
  85
  86     intel->locked = 1;
  87 }
  88
  89
  90 /* Unlock the hardware using the global current context
  91  */
  92 void UNLOCK_HARDWARE( struct intel_context *intel )
  93 {
  94    assert(intel->locked);
  95    intel->locked = 0;
  96
  97    DRM_UNLOCK(intel->driFd, intel->driHwLock, intel->hHWContext);
  98
  99    pipe_mutex_unlock(lockMutex);
 100
 101    DBG(LOCK, "%s - unlocked\n", __progname);
 102 }