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 VMWARE 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 #include "util/u_file.h"
  35 #include "util/xmlconfig.h"
  36 #include "util/xmlpool.h"
  37
  38 #include <string.h>
  39
  40 #ifdef _MSC_VER
  41 #include <stdlib.h>
  42 #define PATH_MAX _MAX_PATH
  43 #endif
  44
  45 #define MODULE_PREFIX "pipe_"
  46
  47 static int (*backends[])(struct pipe_loader_device **, int) = {
  48 #ifdef HAVE_LIBDRM
  49    &pipe_loader_drm_probe,
  50 #endif
  51    &pipe_loader_sw_probe
  52 };
  53
  54 const char gallium_driinfo_xml[] =
  55    DRI_CONF_BEGIN
  56 #include "driinfo_gallium.h"
  57    DRI_CONF_END
  58 ;
  59
  60 int
  61 pipe_loader_probe(struct pipe_loader_device **devs, int ndev)
  62 {
  63    int i, n = 0;
  64
  65    for (i = 0; i < ARRAY_SIZE(backends); i++)
  66       n += backends[i](&devs[n], MAX2(0, ndev - n));
  67
  68    return n;
  69 }
  70
  71 void
  72 pipe_loader_release(struct pipe_loader_device **devs, int ndev)
  73 {
  74    int i;
  75
  76    for (i = 0; i < ndev; i++)
  77       devs[i]->ops->release(&devs[i]);
  78 }
  79
  80 void
  81 pipe_loader_base_release(struct pipe_loader_device **dev)
  82 {
  83    driDestroyOptionCache(&(*dev)->option_cache);
  84    driDestroyOptionInfo(&(*dev)->option_info);
  85
  86    FREE(*dev);
  87    *dev = NULL;
  88 }
  89
  90 void
  91 pipe_loader_load_options(struct pipe_loader_device *dev)
  92 {
  93    if (dev->option_info.info)
  94       return;
  95
  96    const char *xml_options = dev->ops->get_driconf_xml(dev);
  97    if (!xml_options)
  98       xml_options = gallium_driinfo_xml;
  99
 100    driParseOptionInfo(&dev->option_info, xml_options);
 101    driParseConfigFiles(&dev->option_cache, &dev->option_info, 0,
 102                        dev->driver_name, NULL);
 103 }
 104
 105 char *
 106 pipe_loader_get_driinfo_xml(const char *driver_name)
 107 {
 108 #ifdef HAVE_LIBDRM
 109    char *xml = pipe_loader_drm_get_driinfo_xml(driver_name);
 110 #else
 111    char *xml = NULL;
 112 #endif
 113
 114    if (!xml)
 115       xml = strdup(gallium_driinfo_xml);
 116
 117    return xml;
 118 }
 119
 120 struct pipe_screen *
 121 pipe_loader_create_screen(struct pipe_loader_device *dev)
 122 {
 123    struct pipe_screen_config config;
 124
 125    pipe_loader_load_options(dev);
 126    config.options = &dev->option_cache;
 127
 128    return dev->ops->create_screen(dev, &config);
 129 }
 130
 131 struct util_dl_library *
 132 pipe_loader_find_module(const char *driver_name,
 133                         const char *library_paths)
 134 {
 135    struct util_dl_library *lib;
 136    const char *next;
 137    char path[PATH_MAX];
 138    int len, ret;
 139
 140    for (next = library_paths; *next; library_paths = next + 1) {
 141       next = strchrnul(library_paths, ':');
 142       len = next - library_paths;
 143
 144       if (len)
 145          ret = snprintf(path, sizeof(path), "%.*s/%s%s%s",
 146                         len, library_paths,
 147                         MODULE_PREFIX, driver_name, UTIL_DL_EXT);
 148       else
 149          ret = snprintf(path, sizeof(path), "%s%s%s",
 150                         MODULE_PREFIX, driver_name, UTIL_DL_EXT);
 151
 152       if (ret > 0 && ret < sizeof(path) && u_file_access(path, 0) != -1) {
 153          lib = util_dl_open(path);
 154          if (lib) {
 155             return lib;
 156          }
 157          fprintf(stderr, "ERROR: Failed to load pipe driver at `%s': %s\n",
 158                          path, util_dl_error());
 159       }
 160    }
 161
 162    return NULL;
 163 }