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/* Copyright (c) 2017, ARM Limited. All rights reserved.
*
* Copyright (c) 2017, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#include <stdio.h>
#include <errno.h>
#include "odp_module.h"
#define MODULE_FRAMEWORK_VERSION 0x00010000UL
ODP_SUBSYSTEM_DEFINE(module, "module framework", MODULE_FRAMEWORK_VERSION);
/* Bootstrap log facility, enable if ODP_DEBUG_PRINT flag is set. */
#define DBG(format, ...) \
do { \
if (ODP_DEBUG_PRINT == 1) \
fprintf(stderr, format, ##__VA_ARGS__); \
} while (0)
/* Keep it simple, allow one registration session at a time. */
static struct {
odp_rwlock_t lock;
odp_subsystem_t *subsystem;
odp_module_base_t *module;
} registration = {
.lock = ODP_RWLOCK_UNLOCKED,
.subsystem = NULL,
.module = NULL,
};
static inline int registration_sanity_check(
odp_subsystem_t *subsystem, odp_module_base_t *module)
{
if (subsystem == NULL || module == NULL)
return -ENOENT;
if (!list_node_detached(&module->list)) {
DBG("module %s was already registered.\n", module->name);
return -EAGAIN;
}
return 0;
}
/* Module is linked statically or dynamically, and are loaded by
* program loader (execve) or dynamic linker/loader (ld.so)
*
* subsystem_register_module() should complete the whole registration
* session and link the module into subsystem's module array.
*/
static int linker_register_module(
odp_subsystem_t *subsystem, odp_module_base_t *module)
{
int sanity = registration_sanity_check(subsystem, module);
if (sanity < 0) /* sanity check errors */
return sanity;
/* Allow one registration session at a time */
odp_rwlock_write_lock(®istration.lock);
/* Block the subsystem API calls in load new
* implementation modules. */
odp_rwlock_write_lock(&subsystem->lock);
module->handler = NULL; /* no DSO handler */
list_add_tail(&subsystem->modules, &module->list);
odp_rwlock_write_unlock(&subsystem->lock);
odp_rwlock_write_unlock(®istration.lock);
return 0;
}
static int (*do_register_module)(odp_subsystem_t *, odp_module_base_t *)
= &linker_register_module;
static int loader_register_module(
odp_subsystem_t *subsystem, odp_module_base_t *module)
{
int sanity = registration_sanity_check(subsystem, module);
if (sanity < 0) /* sanity check errors */
return sanity;
/* Registration session lock must be held by
* module_loader_start(). */
if (odp_rwlock_write_trylock(®istration.lock) == 0) {
registration.subsystem = subsystem;
registration.module = module;
return 0;
}
odp_rwlock_write_unlock(®istration.lock);
return -EACCES;
}
void odp_module_loader_start(void)
{
odp_rwlock_write_lock(®istration.lock);
if (registration.module != NULL ||
registration.subsystem != NULL) {
DBG("module loader start warn, A previous "
"registration did not complete yet.\n");
}
registration.module = NULL;
registration.subsystem = NULL;
do_register_module = &loader_register_module;
}
void odp_module_loader_end(void)
{
if (registration.module != NULL ||
registration.subsystem != NULL) {
DBG("module loader end warn, A previous "
"registration did not complete yet.\n");
}
registration.module = NULL;
registration.subsystem = NULL;
do_register_module = &linker_register_module;
odp_rwlock_write_unlock(®istration.lock);
}
int odp_module_install(void *dso, bool active)
{
/* Bottom halves of the registration, context exclusion
* is guaranteed by module_loader_start()
*/
if (odp_rwlock_write_trylock(®istration.lock) == 0) {
odp_subsystem_t *subsystem = registration.subsystem;
odp_module_base_t *module = registration.module;
if (subsystem != NULL && module != NULL) {
odp_rwlock_write_lock(&subsystem->lock);
module->handler = dso;
list_add_tail(&subsystem->modules, &module->list);
/* install as active implementation */
if (active) /* warn: replaceable */
subsystem->active = module;
odp_rwlock_write_unlock(&subsystem->lock);
}
registration.subsystem = NULL;
registration.module = NULL;
return 0;
}
odp_rwlock_write_unlock(®istration.lock);
return -EACCES;
}
int odp_module_abandon(void)
{
/* Bottom halves of the registration, context exclusion
* is guaranteed by module_loader_start()
*/
if (odp_rwlock_write_trylock(®istration.lock) == 0) {
registration.subsystem = NULL;
registration.module = NULL;
return 0;
}
odp_rwlock_write_unlock(®istration.lock);
return -EACCES;
}
int __subsystem_register_module(
odp_subsystem_t *subsystem, odp_module_base_t *module)
{
return do_register_module(subsystem, module);
}
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