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  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. #ifdef HAVE_PIPE_LOADER_DRM
  53.    int ret;
  54.  
  55.    ret = pipe_loader_drm_probe_fd(&dev, gdrm->base.base.fd);
  56.    if (!ret)
  57.       return -1;
  58. #endif /* HAVE_PIPE_LOADER_DRM */
  59.  
  60.    gdrm->screen = pipe_loader_create_screen(dev, get_library_search_path());
  61.    if (gdrm->screen == NULL) {
  62.       debug_printf("failed to load driver: %s\n", gdrm->base.driver_name);
  63.       pipe_loader_release(&dev, 1);
  64.       return -1;
  65.    };
  66.  
  67.    gdrm->driver = dev;
  68.    gdrm->base.driver_name = strdup(dev->driver_name);
  69.    return 0;
  70. }
  71.  
  72. void
  73. gallium_screen_destroy(struct gbm_gallium_drm_device *gdrm)
  74. {
  75.    FREE(gdrm->base.driver_name);
  76.    gdrm->screen->destroy(gdrm->screen);
  77.    pipe_loader_release((struct pipe_loader_device **)&gdrm->driver, 1);
  78. }
  79.  
  80. GBM_EXPORT struct gbm_backend gbm_backend = {
  81.    .backend_name = "gallium_drm",
  82.    .create_device = gbm_gallium_drm_device_create,
  83. };
  84.