src/mesa/drivers/dri/radeon/radeon_lock.c

   1 /**************************************************************************
   2
   3 Copyright 2000, 2001 ATI Technologies Inc., Ontario, Canada, and
   4                      VA Linux Systems Inc., Fremont, California.
   5 Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
   6
   7 The Weather Channel (TM) funded Tungsten Graphics to develop the
   8 initial release of the Radeon 8500 driver under the XFree86 license.
   9 This notice must be preserved.
  10
  11 All Rights Reserved.
  12
  13 Permission is hereby granted, free of charge, to any person obtaining
  14 a copy of this software and associated documentation files (the
  15 "Software"), to deal in the Software without restriction, including
  16 without limitation the rights to use, copy, modify, merge, publish,
  17 distribute, sublicense, and/or sell copies of the Software, and to
  18 permit persons to whom the Software is furnished to do so, subject to
  19 the following conditions:
  20
  21 The above copyright notice and this permission notice (including the
  22 next paragraph) shall be included in all copies or substantial
  23 portions of the Software.
  24
  25 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  28 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  29 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32
  33 **************************************************************************/
  34
  35 /*
  36  * Authors:
  37  *   Gareth Hughes <gareth@valinux.com>
  38  *   Keith Whitwell <keith@tungstengraphics.com>
  39  *   Kevin E. Martin <martin@valinux.com>
  40  */
  41
  42 #include "main/glheader.h"
  43 #include "main/mtypes.h"
  44 #include "main/colormac.h"
  45 #include "dri_util.h"
  46 #include "radeon_screen.h"
  47 #include "radeon_common.h"
  48 #include "radeon_lock.h"
  49 #include "drirenderbuffer.h"
  50
  51 /* Update the hardware state.  This is called if another context has
  52  * grabbed the hardware lock, which includes the X server.  This
  53  * function also updates the driver's window state after the X server
  54  * moves, resizes or restacks a window -- the change will be reflected
  55  * in the drawable position and clip rects.  Since the X server grabs
  56  * the hardware lock when it changes the window state, this routine will
  57  * automatically be called after such a change.
  58  */
  59 void radeonGetLock(radeonContextPtr rmesa, GLuint flags)
  60 {
  61         __DRIdrawablePrivate *const drawable = radeon_get_drawable(rmesa);
  62         __DRIdrawablePrivate *const readable = radeon_get_readable(rmesa);
  63         __DRIscreenPrivate *sPriv = rmesa->dri.screen;
  64
  65         assert(drawable != NULL);
  66
  67         drmGetLock(rmesa->dri.fd, rmesa->dri.hwContext, flags);
  68
  69         /* The window might have moved, so we might need to get new clip
  70          * rects.
  71          *
  72          * NOTE: This releases and regrabs the hw lock to allow the X server
  73          * to respond to the DRI protocol request for new drawable info.
  74          * Since the hardware state depends on having the latest drawable
  75          * clip rects, all state checking must be done _after_ this call.
  76          */
  77         DRI_VALIDATE_DRAWABLE_INFO(sPriv, drawable);
  78         if (drawable != readable) {
  79                 DRI_VALIDATE_DRAWABLE_INFO(sPriv, readable);
  80         }
  81
  82         if (rmesa->lastStamp != drawable->lastStamp) {
  83                 radeon_window_moved(rmesa);
  84                 rmesa->lastStamp = drawable->lastStamp;
  85         }
  86
  87         rmesa->vtbl.get_lock(rmesa);
  88 }
  89 #ifndef NDEBUG
  90 struct lock_debug {
  91         const char* function;
  92         const char* file;
  93         int line;
  94 };
  95
  96 static struct lock_debug ldebug = {0};
  97 #endif
  98
  99 #if 0
 100 /** TODO: use atomic operations for reference counting **/
 101 /** gcc 4.2 has builtin functios for this **/
 102 #define ATOMIC_INC_AND_FETCH(atomic) __sync_add_and_fetch(&atomic, 1)
 103 #define ATOMIC_DEC_AND_FETCH(atomic) __sync_sub_and_fetch(&atomic, 1)
 104 #else
 105 #define ATOMIC_INC_AND_FETCH(atomic) (++atomic)
 106 #define ATOMIC_DEC_AND_FETCH(atomic) (--atomic)
 107 #endif
 108
 109
 110 void radeon_lock_hardware(radeonContextPtr radeon
 111 #ifndef NDEBUG
 112                 ,const char* function
 113                 ,const char* file
 114                 ,const int line
 115 #endif
 116                 )
 117 {
 118         char ret = 0;
 119         struct radeon_framebuffer *rfb = NULL;
 120         struct radeon_renderbuffer *rrb = NULL;
 121
 122         if (radeon_get_drawable(radeon)) {
 123                 rfb = radeon_get_drawable(radeon)->driverPrivate;
 124
 125                 if (rfb)
 126                         rrb = radeon_get_renderbuffer(&rfb->base,
 127                                                       rfb->base._ColorDrawBufferIndexes[0]);
 128         }
 129
 130         if (!radeon->radeonScreen->driScreen->dri2.enabled) {
 131                 if (ATOMIC_INC_AND_FETCH(radeon->dri.hwLockCount) > 1)
 132                 {
 133 #ifndef NDEBUG
 134                         if ( RADEON_DEBUG & RADEON_SANITY )
 135                                 fprintf(stderr, "*** %d times of recursive call to %s ***\n"
 136                                                 "Original call was from %s (file: %s line: %d)\n"
 137                                                 "Now call is coming from %s (file: %s line: %d)\n"
 138                                                 , radeon->dri.hwLockCount, __FUNCTION__
 139                                                 , ldebug.function, ldebug.file, ldebug.line
 140                                                 , function, file, line
 141                                            );
 142 #endif
 143                         return;
 144                 }
 145                 DRM_CAS(radeon->dri.hwLock, radeon->dri.hwContext,
 146                          (DRM_LOCK_HELD | radeon->dri.hwContext), ret );
 147                 if (ret)
 148                         radeonGetLock(radeon, 0);
 149 #ifndef NDEBUG
 150                 ldebug.function = function;
 151                 ldebug.file = file;
 152                 ldebug.line = line;
 153 #endif
 154         }
 155 }
 156
 157 void radeon_unlock_hardware(radeonContextPtr radeon)
 158 {
 159         if (!radeon->radeonScreen->driScreen->dri2.enabled) {
 160                 if (ATOMIC_DEC_AND_FETCH(radeon->dri.hwLockCount) > 0)
 161                 {
 162                         return;
 163                 }
 164                 DRM_UNLOCK( radeon->dri.fd,
 165                             radeon->dri.hwLock,
 166                             radeon->dri.hwContext );
 167         }
 168 }