mirror of https://gitee.com/openkylin/qemu.git
311 lines
7.5 KiB
C
311 lines
7.5 KiB
C
/*
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* QEMU Module Infrastructure
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#ifdef CONFIG_MODULES
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#include <gmodule.h>
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#endif
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#include "qemu/queue.h"
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#include "qemu/module.h"
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#ifdef CONFIG_MODULE_UPGRADES
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#include "qemu-version.h"
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#endif
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typedef struct ModuleEntry
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{
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void (*init)(void);
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QTAILQ_ENTRY(ModuleEntry) node;
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module_init_type type;
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} ModuleEntry;
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typedef QTAILQ_HEAD(, ModuleEntry) ModuleTypeList;
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static ModuleTypeList init_type_list[MODULE_INIT_MAX];
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static bool modules_init_done[MODULE_INIT_MAX];
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static ModuleTypeList dso_init_list;
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static void init_lists(void)
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{
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static int inited;
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int i;
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if (inited) {
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return;
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}
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for (i = 0; i < MODULE_INIT_MAX; i++) {
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QTAILQ_INIT(&init_type_list[i]);
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}
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QTAILQ_INIT(&dso_init_list);
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inited = 1;
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}
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static ModuleTypeList *find_type(module_init_type type)
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{
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init_lists();
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return &init_type_list[type];
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}
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void register_module_init(void (*fn)(void), module_init_type type)
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{
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ModuleEntry *e;
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ModuleTypeList *l;
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e = g_malloc0(sizeof(*e));
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e->init = fn;
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e->type = type;
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l = find_type(type);
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QTAILQ_INSERT_TAIL(l, e, node);
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}
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void register_dso_module_init(void (*fn)(void), module_init_type type)
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{
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ModuleEntry *e;
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init_lists();
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e = g_malloc0(sizeof(*e));
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e->init = fn;
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e->type = type;
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QTAILQ_INSERT_TAIL(&dso_init_list, e, node);
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}
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void module_call_init(module_init_type type)
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{
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ModuleTypeList *l;
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ModuleEntry *e;
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if (modules_init_done[type]) {
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return;
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}
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l = find_type(type);
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QTAILQ_FOREACH(e, l, node) {
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e->init();
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}
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modules_init_done[type] = true;
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}
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#ifdef CONFIG_MODULES
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static int module_load_file(const char *fname)
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{
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GModule *g_module;
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void (*sym)(void);
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const char *dsosuf = CONFIG_HOST_DSOSUF;
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int len = strlen(fname);
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int suf_len = strlen(dsosuf);
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ModuleEntry *e, *next;
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int ret;
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if (len <= suf_len || strcmp(&fname[len - suf_len], dsosuf)) {
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/* wrong suffix */
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ret = -EINVAL;
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goto out;
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}
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if (access(fname, F_OK)) {
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ret = -ENOENT;
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goto out;
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}
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assert(QTAILQ_EMPTY(&dso_init_list));
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g_module = g_module_open(fname, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
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if (!g_module) {
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fprintf(stderr, "Failed to open module: %s\n",
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g_module_error());
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ret = -EINVAL;
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goto out;
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}
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if (!g_module_symbol(g_module, DSO_STAMP_FUN_STR, (gpointer *)&sym)) {
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fprintf(stderr, "Failed to initialize module: %s\n",
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fname);
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/* Print some info if this is a QEMU module (but from different build),
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* this will make debugging user problems easier. */
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if (g_module_symbol(g_module, "qemu_module_dummy", (gpointer *)&sym)) {
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fprintf(stderr,
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"Note: only modules from the same build can be loaded.\n");
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}
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g_module_close(g_module);
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ret = -EINVAL;
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} else {
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QTAILQ_FOREACH(e, &dso_init_list, node) {
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e->init();
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register_module_init(e->init, e->type);
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}
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ret = 0;
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}
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QTAILQ_FOREACH_SAFE(e, &dso_init_list, node, next) {
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QTAILQ_REMOVE(&dso_init_list, e, node);
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g_free(e);
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}
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out:
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return ret;
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}
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#endif
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bool module_load_one(const char *prefix, const char *lib_name)
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{
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bool success = false;
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#ifdef CONFIG_MODULES
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char *fname = NULL;
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char *exec_dir;
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#ifdef CONFIG_MODULE_UPGRADES
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char *version_dir;
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#endif
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const char *search_dir;
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char *dirs[5];
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char *module_name;
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int i = 0, n_dirs = 0;
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int ret;
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static GHashTable *loaded_modules;
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if (!g_module_supported()) {
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fprintf(stderr, "Module is not supported by system.\n");
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return false;
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}
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if (!loaded_modules) {
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loaded_modules = g_hash_table_new(g_str_hash, g_str_equal);
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}
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module_name = g_strdup_printf("%s%s", prefix, lib_name);
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if (!g_hash_table_add(loaded_modules, module_name)) {
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g_free(module_name);
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return true;
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}
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exec_dir = qemu_get_exec_dir();
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search_dir = getenv("QEMU_MODULE_DIR");
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if (search_dir != NULL) {
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dirs[n_dirs++] = g_strdup_printf("%s", search_dir);
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}
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dirs[n_dirs++] = g_strdup_printf("%s", CONFIG_QEMU_MODDIR);
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dirs[n_dirs++] = g_strdup_printf("%s", exec_dir ? : "");
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#ifdef CONFIG_MODULE_UPGRADES
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version_dir = g_strcanon(g_strdup(QEMU_PKGVERSION),
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G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "+-.~",
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'_');
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dirs[n_dirs++] = g_strdup_printf("/var/run/qemu/%s", version_dir);
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#endif
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assert(n_dirs <= ARRAY_SIZE(dirs));
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g_free(exec_dir);
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exec_dir = NULL;
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for (i = 0; i < n_dirs; i++) {
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fname = g_strdup_printf("%s/%s%s",
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dirs[i], module_name, CONFIG_HOST_DSOSUF);
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ret = module_load_file(fname);
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g_free(fname);
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fname = NULL;
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/* Try loading until loaded a module file */
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if (!ret) {
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success = true;
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break;
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}
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}
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if (!success) {
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g_hash_table_remove(loaded_modules, module_name);
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g_free(module_name);
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}
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for (i = 0; i < n_dirs; i++) {
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g_free(dirs[i]);
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}
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#endif
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return success;
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}
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/*
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* Building devices and other qom objects modular is mostly useful in
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* case they have dependencies to external shared libraries, so we can
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* cut down the core qemu library dependencies. Which is the case for
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* only a very few devices & objects.
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*
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* So with the expectation that this will be rather the exception than
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* to rule and the list will not gain that many entries go with a
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* simple manually maintained list for now.
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*/
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static struct {
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const char *type;
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const char *prefix;
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const char *module;
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} const qom_modules[] = {
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{ "ccid-card-passthru", "hw-", "usb-smartcard" },
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{ "ccid-card-emulated", "hw-", "usb-smartcard" },
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{ "usb-redir", "hw-", "usb-redirect" },
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{ "qxl-vga", "hw-", "display-qxl" },
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{ "qxl", "hw-", "display-qxl" },
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{ "chardev-braille", "chardev-", "baum" },
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};
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static bool module_loaded_qom_all;
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void module_load_qom_one(const char *type)
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{
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int i;
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if (!type) {
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return;
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}
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if (module_loaded_qom_all) {
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return;
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}
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for (i = 0; i < ARRAY_SIZE(qom_modules); i++) {
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if (strcmp(qom_modules[i].type, type) == 0) {
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module_load_one(qom_modules[i].prefix,
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qom_modules[i].module);
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return;
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}
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}
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}
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void module_load_qom_all(void)
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{
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int i;
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if (module_loaded_qom_all) {
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return;
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}
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for (i = 0; i < ARRAY_SIZE(qom_modules); i++) {
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if (i > 0 && (strcmp(qom_modules[i - 1].module,
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qom_modules[i].module) == 0 &&
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strcmp(qom_modules[i - 1].prefix,
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qom_modules[i].prefix) == 0)) {
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/* one module implementing multiple types -> load only once */
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continue;
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}
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module_load_one(qom_modules[i].prefix, qom_modules[i].module);
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}
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module_loaded_qom_all = true;
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}
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