src/gallium/winsys/freedreno/drm/freedreno_drm_winsys.c

   1 /*
   2  * Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Rob Clark <robclark@freedesktop.org>
  25  */
  26
  27 #include <sys/stat.h>
  28
  29 #include "pipe/p_context.h"
  30 #include "pipe/p_state.h"
  31 #include "util/format/u_format.h"
  32 #include "util/u_memory.h"
  33 #include "util/u_inlines.h"
  34 #include "util/u_hash_table.h"
  35 #include "util/u_pointer.h"
  36 #include "os/os_thread.h"
  37
  38 #include "freedreno_drm_public.h"
  39
  40 #include "freedreno/freedreno_screen.h"
  41
  42 static struct hash_table *fd_tab = NULL;
  43
  44 static mtx_t fd_screen_mutex = _MTX_INITIALIZER_NP;
  45
  46 static void
  47 fd_drm_screen_destroy(struct pipe_screen *pscreen)
  48 {
  49         struct fd_screen *screen = fd_screen(pscreen);
  50         boolean destroy;
  51
  52         mtx_lock(&fd_screen_mutex);
  53         destroy = --screen->refcnt == 0;
  54         if (destroy) {
  55                 int fd = fd_device_fd(screen->dev);
  56                 _mesa_hash_table_remove_key(fd_tab, intptr_to_pointer(fd));
  57         }
  58         mtx_unlock(&fd_screen_mutex);
  59
  60         if (destroy) {
  61                 pscreen->destroy = screen->winsys_priv;
  62                 pscreen->destroy(pscreen);
  63         }
  64 }
  65
  66 struct pipe_screen *
  67 fd_drm_screen_create(int fd, struct renderonly *ro)
  68 {
  69         struct pipe_screen *pscreen = NULL;
  70
  71         mtx_lock(&fd_screen_mutex);
  72         if (!fd_tab) {
  73                 fd_tab = util_hash_table_create_fd_keys();
  74                 if (!fd_tab)
  75                         goto unlock;
  76         }
  77
  78         pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
  79         if (pscreen) {
  80                 fd_screen(pscreen)->refcnt++;
  81         } else {
  82                 struct fd_device *dev = fd_device_new_dup(fd);
  83                 if (!dev)
  84                         goto unlock;
  85
  86                 pscreen = fd_screen_create(dev, ro);
  87                 if (pscreen) {
  88                         int fd = fd_device_fd(dev);
  89
  90                         _mesa_hash_table_insert(fd_tab, intptr_to_pointer(fd), pscreen);
  91
  92                         /* Bit of a hack, to avoid circular linkage dependency,
  93                          * ie. pipe driver having to call in to winsys, we
  94                          * override the pipe drivers screen->destroy():
  95                          */
  96                         fd_screen(pscreen)->winsys_priv = pscreen->destroy;
  97                         pscreen->destroy = fd_drm_screen_destroy;
  98                 }
  99         }
 100
 101 unlock:
 102         mtx_unlock(&fd_screen_mutex);
 103         return pscreen;
 104 }