src/gallium/targets/gbm/gbm.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   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,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  26  */
  27
  28 #include "gbm_gallium_drmint.h"
  29
  30 #include "util/u_memory.h"
  31 #include "util/u_inlines.h"
  32 #include "pipe-loader/pipe_loader.h"
  33
  34 static const char *
  35 get_library_search_path(void)
  36 {
  37    const char *search_path = NULL;
  38
  39    /* don't allow setuid apps to use GBM_BACKENDS_PATH */
  40    if (geteuid() == getuid())
  41       search_path = getenv("GBM_BACKENDS_PATH");
  42    if (search_path == NULL)
  43       search_path = PIPE_SEARCH_DIR;
  44
  45    return search_path;
  46 }
  47
  48 int
  49 gallium_screen_create(struct gbm_gallium_drm_device *gdrm)
  50 {
  51    struct pipe_loader_device *dev;
  52    int ret;
  53
  54    ret = pipe_loader_drm_probe_fd(&dev, gdrm->base.base.fd);
  55    if (!ret)
  56       return -1;
  57
  58    gdrm->screen = pipe_loader_create_screen(dev, get_library_search_path());
  59    if (gdrm->screen == NULL) {
  60       debug_printf("failed to load driver: %s\n", gdrm->base.driver_name);
  61       pipe_loader_release(&dev, 1);
  62       return -1;
  63    };
  64
  65    gdrm->driver = dev;
  66    gdrm->base.driver_name = strdup(dev->driver_name);
  67    return 0;
  68 }
  69
  70 void
  71 gallium_screen_destroy(struct gbm_gallium_drm_device *gdrm)
  72 {
  73    FREE(gdrm->base.driver_name);
  74    gdrm->screen->destroy(gdrm->screen);
  75    pipe_loader_release((struct pipe_loader_device **)&gdrm->driver, 1);
  76 }
  77
  78 GBM_EXPORT struct gbm_backend gbm_backend = {
  79    .backend_name = "gallium_drm",
  80    .create_device = gbm_gallium_drm_device_create,
  81 };