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      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 < ARRAY_SIZE(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 }
    113