239 lines
5.5 KiB
C
239 lines
5.5 KiB
C
/*
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* Copyright © 2011 Intel Corporation
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* Copyright © 2021 NVIDIA Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Benjamin Franzke <benjaminfranzke@googlemail.com>
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* James Jones <jajones@nvidia.com>
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <assert.h>
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#include <dlfcn.h>
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#include <xf86drm.h>
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#include "loader.h"
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#include "backend.h"
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
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#define VER_MIN(a, b) ((a) < (b) ? (a) : (b))
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extern const struct gbm_backend gbm_dri_backend;
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struct gbm_backend_desc {
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const char *name;
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const struct gbm_backend *backend;
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void *lib;
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};
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static const struct gbm_backend_desc builtin_backends[] = {
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{ "dri", &gbm_dri_backend },
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};
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#define BACKEND_LIB_SUFFIX "_gbm"
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static const char *backend_search_path_vars[] = {
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"GBM_BACKENDS_PATH",
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NULL
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};
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static void
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free_backend_desc(const struct gbm_backend_desc *backend_desc)
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{
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assert(backend_desc->lib);
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dlclose(backend_desc->lib);
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free((void *)backend_desc->name);
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free((void *)backend_desc);
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}
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static struct gbm_backend_desc *
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create_backend_desc(const char *name,
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const struct gbm_backend *backend,
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void *lib)
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{
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struct gbm_backend_desc *new_desc = calloc(1, sizeof(*new_desc));
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if (!new_desc)
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return NULL;
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new_desc->name = strdup(name);
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if (!new_desc->name) {
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free(new_desc);
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return NULL;
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}
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new_desc->backend = backend;
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new_desc->lib = lib;
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return new_desc;
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}
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static struct gbm_device *
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backend_create_device(const struct gbm_backend_desc *bd, int fd)
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{
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const uint32_t abi_ver = VER_MIN(GBM_BACKEND_ABI_VERSION,
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bd->backend->v0.backend_version);
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struct gbm_device *dev = bd->backend->v0.create_device(fd, abi_ver);
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if (dev) {
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if (abi_ver != dev->v0.backend_version) {
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_gbm_device_destroy(dev);
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return NULL;
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}
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dev->v0.backend_desc = bd;
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}
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return dev;
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}
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static struct gbm_device *
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load_backend(void *lib, int fd, const char *name)
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{
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struct gbm_device *dev = NULL;
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struct gbm_backend_desc *backend_desc;
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const struct gbm_backend *gbm_backend;
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GBM_GET_BACKEND_PROC_PTR get_backend;
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get_backend = dlsym(lib, GBM_GET_BACKEND_PROC_NAME);
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if (!get_backend)
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goto fail;
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gbm_backend = get_backend(&gbm_core);
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backend_desc = create_backend_desc(name, gbm_backend, lib);
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if (!backend_desc)
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goto fail;
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dev = backend_create_device(backend_desc, fd);
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if (!dev)
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free_backend_desc(backend_desc);
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return dev;
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fail:
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dlclose(lib);
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return NULL;
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}
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static struct gbm_device *
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find_backend(const char *name, int fd)
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{
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struct gbm_device *dev = NULL;
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const struct gbm_backend_desc *bd;
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void *lib;
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unsigned i;
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for (i = 0; i < ARRAY_SIZE(builtin_backends); ++i) {
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bd = &builtin_backends[i];
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if (name && strcmp(bd->name, name))
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continue;
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dev = backend_create_device(bd, fd);
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if (dev)
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break;
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}
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if (name && !dev) {
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lib = loader_open_driver_lib(name, BACKEND_LIB_SUFFIX,
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backend_search_path_vars,
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DEFAULT_BACKENDS_PATH,
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true);
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if (lib)
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dev = load_backend(lib, fd, name);
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}
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return dev;
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}
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static struct gbm_device *
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override_backend(int fd)
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{
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struct gbm_device *dev = NULL;
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const char *b;
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b = getenv("GBM_BACKEND");
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if (b)
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dev = find_backend(b, fd);
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return dev;
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}
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static struct gbm_device *
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backend_from_driver_name(int fd)
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{
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struct gbm_device *dev = NULL;
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drmVersionPtr v = drmGetVersion(fd);
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void *lib;
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if (!v)
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return NULL;
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lib = loader_open_driver_lib(v->name, BACKEND_LIB_SUFFIX,
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backend_search_path_vars,
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DEFAULT_BACKENDS_PATH,
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false);
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if (lib)
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dev = load_backend(lib, fd, v->name);
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drmFreeVersion(v);
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return dev;
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}
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struct gbm_device *
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_gbm_create_device(int fd)
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{
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struct gbm_device *dev;
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dev = override_backend(fd);
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if (!dev)
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dev = backend_from_driver_name(fd);
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if (!dev)
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dev = find_backend(NULL, fd);
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return dev;
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}
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void
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_gbm_device_destroy(struct gbm_device *gbm)
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{
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const struct gbm_backend_desc *backend_desc = gbm->v0.backend_desc;
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gbm->v0.destroy(gbm);
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if (backend_desc && backend_desc->lib)
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free_backend_desc(backend_desc);
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}
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