src/gallium/auxiliary/pipe-loader/pipe_loader.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2012 Francisco Jerez
   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 "pipe_loader_priv.h"
  29
  30 #include "util/u_inlines.h"
  31 #include "util/u_memory.h"
  32 #include "util/u_string.h"
  33 #include "util/u_dl.h"
  34
  35 #define MODULE_PREFIX "pipe_"
  36
  37 static int (*backends[])(struct pipe_loader_device **, int) = {
  38 #ifdef HAVE_PIPE_LOADER_DRM
  39    &pipe_loader_drm_probe,
  40 #endif
  41    &pipe_loader_sw_probe
  42 };
  43
  44 int
  45 pipe_loader_probe(struct pipe_loader_device **devs, int ndev)
  46 {
  47    int i, n = 0;
  48
  49    for (i = 0; i < Elements(backends); i++)
  50       n += backends[i](&devs[n], MAX2(0, ndev - n));
  51
  52    return n;
  53 }
  54
  55 void
  56 pipe_loader_release(struct pipe_loader_device **devs, int ndev)
  57 {
  58    int i;
  59
  60    for (i = 0; i < ndev; i++)
  61       devs[i]->ops->release(&devs[i]);
  62 }
  63
  64 struct pipe_screen *
  65 pipe_loader_create_screen(struct pipe_loader_device *dev,
  66                           const char *library_paths)
  67 {
  68    return dev->ops->create_screen(dev, library_paths);
  69 }
  70
  71 struct util_dl_library *
  72 pipe_loader_find_module(struct pipe_loader_device *dev,
  73                         const char *library_paths)
  74 {
  75    struct util_dl_library *lib;
  76    const char *next;
  77    char path[PATH_MAX];
  78    int len, ret;
  79
  80    for (next = library_paths; *next; library_paths = next + 1) {
  81       next = util_strchrnul(library_paths, ':');
  82       len = next - library_paths;
  83
  84       if (len)
  85          ret = util_snprintf(path, sizeof(path), "%.*s/%s%s%s",
  86                              len, library_paths,
  87                              MODULE_PREFIX, dev->driver_name, UTIL_DL_EXT);
  88       else
  89          ret = util_snprintf(path, sizeof(path), "%s%s%s",
  90                              MODULE_PREFIX, dev->driver_name, UTIL_DL_EXT);
  91
  92       if (ret > 0 && ret < sizeof(path)) {
  93          lib = util_dl_open(path);
  94          if (lib) {
  95             return lib;
  96          }
  97       }
  98    }
  99
 100    return NULL;
 101 }