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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2021, Linaro Limited
* Copyright (c) 2016, EPAM Systems
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/crash_dump.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tee_core.h>
#include <linux/types.h>
#include "optee_private.h"
static void optee_bus_scan(struct work_struct *work)
{
WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
}
int optee_open(struct tee_context *ctx, bool cap_memref_null)
{
struct optee_context_data *ctxdata;
struct tee_device *teedev = ctx->teedev;
struct optee *optee = tee_get_drvdata(teedev);
ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
if (!ctxdata)
return -ENOMEM;
if (teedev == optee->supp_teedev) {
bool busy = true;
mutex_lock(&optee->supp.mutex);
if (!optee->supp.ctx) {
busy = false;
optee->supp.ctx = ctx;
}
mutex_unlock(&optee->supp.mutex);
if (busy) {
kfree(ctxdata);
return -EBUSY;
}
if (!optee->scan_bus_done) {
INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
schedule_work(&optee->scan_bus_work);
optee->scan_bus_done = true;
}
}
mutex_init(&ctxdata->mutex);
INIT_LIST_HEAD(&ctxdata->sess_list);
ctx->cap_memref_null = cap_memref_null;
ctx->data = ctxdata;
return 0;
}
static void optee_release_helper(struct tee_context *ctx,
int (*close_session)(struct tee_context *ctx,
u32 session,
bool system_thread))
{
struct optee_context_data *ctxdata = ctx->data;
struct optee_session *sess;
struct optee_session *sess_tmp;
if (!ctxdata)
return;
list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
list_node) {
list_del(&sess->list_node);
close_session(ctx, sess->session_id, sess->use_sys_thread);
kfree(sess);
}
kfree(ctxdata);
ctx->data = NULL;
}
void optee_release(struct tee_context *ctx)
{
optee_release_helper(ctx, optee_close_session_helper);
}
void optee_release_supp(struct tee_context *ctx)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
optee_release_helper(ctx, optee_close_session_helper);
optee_supp_release(&optee->supp);
}
void optee_remove_common(struct optee *optee)
{
/* Unregister OP-TEE specific client devices on TEE bus */
optee_unregister_devices();
optee_notif_uninit(optee);
optee_shm_arg_cache_uninit(optee);
teedev_close_context(optee->ctx);
/*
* The two devices have to be unregistered before we can free the
* other resources.
*/
tee_device_unregister(optee->supp_teedev);
tee_device_unregister(optee->teedev);
tee_shm_pool_free(optee->pool);
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
}
static int smc_abi_rc;
static int ffa_abi_rc;
static int __init optee_core_init(void)
{
/*
* The kernel may have crashed at the same time that all available
* secure world threads were suspended and we cannot reschedule the
* suspended threads without access to the crashed kernel's wait_queue.
* Therefore, we cannot reliably initialize the OP-TEE driver in the
* kdump kernel.
*/
if (is_kdump_kernel())
return -ENODEV;
smc_abi_rc = optee_smc_abi_register();
ffa_abi_rc = optee_ffa_abi_register();
/* If both failed there's no point with this module */
if (smc_abi_rc && ffa_abi_rc)
return smc_abi_rc;
return 0;
}
module_init(optee_core_init);
static void __exit optee_core_exit(void)
{
if (!smc_abi_rc)
optee_smc_abi_unregister();
if (!ffa_abi_rc)
optee_ffa_abi_unregister();
}
module_exit(optee_core_exit);
MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:optee");
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