1f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org/* 2f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Copyright © 2011 Intel Corporation 3f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 4f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Permission is hereby granted, free of charge, to any person obtaining a 5f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * copy of this software and associated documentation files (the "Software"), 6f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * to deal in the Software without restriction, including without limitation 7f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * and/or sell copies of the Software, and to permit persons to whom the 9f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software is furnished to do so, subject to the following conditions: 10f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 11f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * The above copyright notice and this permission notice (including the next 12f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * paragraph) shall be included in all copies or substantial portions of the 13f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Software. 14f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 15f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 19f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 20f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * DEALINGS IN THE SOFTWARE. 23f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * 24f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Authors: 25f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org * Benjamin Franzke <benjaminfranzke@googlemail.com> 26f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org */ 27f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 28f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <stdio.h> 29f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <stddef.h> 30f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <stdlib.h> 31f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <string.h> 32f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <limits.h> 33f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include <dlfcn.h> 34f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 35f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#include "backend.h" 36f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 37f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) 38f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 39f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgextern const struct gbm_backend gbm_dri_backend; 40f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 41f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstruct backend_desc { 42f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const char *name; 43f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const struct gbm_backend *builtin; 44f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 45f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 46f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic const struct backend_desc backends[] = { 47f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { "gbm_dri.so", &gbm_dri_backend }, 48f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org { "gbm_gallium_drm.so", NULL }, 49f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org}; 50f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 51f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic const void * 52f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgload_backend(const struct backend_desc *backend) 53f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 54f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org char path[PATH_MAX]; 55f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const void *init = NULL; 56f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org void *module; 57f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const char *name; 58f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const char *entrypoint = "gbm_backend"; 59f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 60f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (backend == NULL) 61f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return NULL; 62f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 63f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org name = backend->name; 64f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 65f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (backend->builtin) { 66f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org init = backend->builtin; 67f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } else { 68f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (name[0] != '/') 69f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org snprintf(path, sizeof path, MODULEDIR "/%s", name); 70f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org else 71f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org snprintf(path, sizeof path, "%s", name); 72f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 73f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org module = dlopen(path, RTLD_NOW | RTLD_GLOBAL); 74f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!module) { 75f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org fprintf(stderr, 76f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org "failed to load module: %s\n", dlerror()); 77f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return NULL; 78f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 79f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 80f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org init = dlsym(module, entrypoint); 81f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (!init) 82f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return NULL; 83f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 84f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 85f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return init; 86f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 87f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 88f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstatic const struct backend_desc * 89f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgfind_backend(const char *name) 90f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 91f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const struct backend_desc *backend = NULL; 92f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int i; 93f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 94f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (i = 0; i < ARRAY_SIZE(backends); ++i) { 95f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (strcmp(backends[i].name, name) == 0) { 96f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org backend = &backends[i]; 97f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org break; 98f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 99f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 100f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 101f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return backend; 102f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 103f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 104f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.orgstruct gbm_device * 105f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org_gbm_create_device(int fd) 106f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org{ 107f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const struct gbm_backend *backend = NULL; 108f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org struct gbm_device *dev = NULL; 109f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org int i; 110f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org const char *b; 111f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 112f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org b = getenv("GBM_BACKEND"); 113f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (b) 114f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org backend = load_backend(find_backend(b)); 115f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 116f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (backend) 117f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dev = backend->create_device(fd); 118f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 119f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org for (i = 0; i < ARRAY_SIZE(backends) && dev == NULL; ++i) { 120f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org backend = load_backend(&backends[i]); 121f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org if (backend == NULL) 122f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org continue; 123f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 124f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org dev = backend->create_device(fd); 125f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org } 126f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org 127f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org return dev; 128f2ba7591b1407a7ee9209f842c50696914dc2dedkbr@chromium.org} 129