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
  35 #ifdef _MSC_VER
  36 #include <stdlib.h>
  37 #define PATH_MAX _MAX_PATH
  38 #endif
  39
  40 #define MODULE_PREFIX "pipe_"
  41
  42 static int (*backends[])(struct pipe_loader_device **, int) = {
  43 #ifdef HAVE_LIBDRM
  44    &pipe_loader_drm_probe,
  45 #endif
  46    &pipe_loader_sw_probe
  47 };
  48
  49 int
  50 pipe_loader_probe(struct pipe_loader_device **devs, int ndev)
  51 {
  52    int i, n = 0;
  53
  54    for (i = 0; i < Elements(backends); i++)
  55       n += backends[i](&devs[n], MAX2(0, ndev - n));
  56
  57    return n;
  58 }
  59
  60 void
  61 pipe_loader_release(struct pipe_loader_device **devs, int ndev)
  62 {
  63    int i;
  64
  65    for (i = 0; i < ndev; i++)
  66       devs[i]->ops->release(&devs[i]);
  67 }
  68
  69 const struct drm_conf_ret *
  70 pipe_loader_configuration(struct pipe_loader_device *dev,
  71                           enum drm_conf conf)
  72 {
  73    return dev->ops->configuration(dev, conf);
  74 }
  75
  76 struct pipe_screen *
  77 pipe_loader_create_screen(struct pipe_loader_device *dev)
  78 {
  79    return dev->ops->create_screen(dev);
  80 }
  81
  82 struct util_dl_library *
  83 pipe_loader_find_module(struct pipe_loader_device *dev,
  84                         const char *library_paths)
  85 {
  86    struct util_dl_library *lib;
  87    const char *next;
  88    char path[PATH_MAX];
  89    int len, ret;
  90
  91    for (next = library_paths; *next; library_paths = next + 1) {
  92       next = util_strchrnul(library_paths, ':');
  93       len = next - library_paths;
  94
  95       if (len)
  96          ret = util_snprintf(path, sizeof(path), "%.*s/%s%s%s",
  97                              len, library_paths,
  98                              MODULE_PREFIX, dev->driver_name, UTIL_DL_EXT);
  99       else
 100          ret = util_snprintf(path, sizeof(path), "%s%s%s",
 101                              MODULE_PREFIX, dev->driver_name, UTIL_DL_EXT);
 102
 103       if (ret > 0 && ret < sizeof(path)) {
 104          lib = util_dl_open(path);
 105          if (lib) {
 106             return lib;
 107          }
 108       }
 109    }
 110
 111    return NULL;
 112 }