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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 (at) 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