tee: add OP-TEE driver
Adds a OP-TEE driver which also can be compiled as a loadable module. * Targets ARM and ARM64 * Supports using reserved memory from OP-TEE as shared memory * Probes OP-TEE version using SMCs * Accepts requests on privileged and unprivileged device * Uses OPTEE message protocol version 2 to communicate with secure world Acked-by: Andreas Dannenberg <dannenberg@ti.com> Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (HiKey) Tested-by: Volodymyr Babchuk <vlad.babchuk@gmail.com> (RCAR H3) Tested-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Jens Wiklander
396
drivers/tee/optee/rpc.c
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396
drivers/tee/optee/rpc.c
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/*
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* Copyright (c) 2015-2016, Linaro Limited
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include "optee_private.h"
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#include "optee_smc.h"
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struct wq_entry {
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struct list_head link;
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struct completion c;
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u32 key;
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};
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void optee_wait_queue_init(struct optee_wait_queue *priv)
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{
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mutex_init(&priv->mu);
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INIT_LIST_HEAD(&priv->db);
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}
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void optee_wait_queue_exit(struct optee_wait_queue *priv)
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{
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mutex_destroy(&priv->mu);
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}
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static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
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{
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struct timespec64 ts;
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if (arg->num_params != 1)
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goto bad;
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if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
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OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
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goto bad;
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getnstimeofday64(&ts);
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arg->params[0].u.value.a = ts.tv_sec;
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arg->params[0].u.value.b = ts.tv_nsec;
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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static struct wq_entry *wq_entry_get(struct optee_wait_queue *wq, u32 key)
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{
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struct wq_entry *w;
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mutex_lock(&wq->mu);
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list_for_each_entry(w, &wq->db, link)
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if (w->key == key)
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goto out;
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w = kmalloc(sizeof(*w), GFP_KERNEL);
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if (w) {
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init_completion(&w->c);
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w->key = key;
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list_add_tail(&w->link, &wq->db);
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}
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out:
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mutex_unlock(&wq->mu);
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return w;
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}
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static void wq_sleep(struct optee_wait_queue *wq, u32 key)
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{
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struct wq_entry *w = wq_entry_get(wq, key);
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if (w) {
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wait_for_completion(&w->c);
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mutex_lock(&wq->mu);
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list_del(&w->link);
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mutex_unlock(&wq->mu);
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kfree(w);
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}
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}
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static void wq_wakeup(struct optee_wait_queue *wq, u32 key)
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{
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struct wq_entry *w = wq_entry_get(wq, key);
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if (w)
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complete(&w->c);
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}
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static void handle_rpc_func_cmd_wq(struct optee *optee,
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struct optee_msg_arg *arg)
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{
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if (arg->num_params != 1)
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goto bad;
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if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
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goto bad;
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switch (arg->params[0].u.value.a) {
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case OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP:
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wq_sleep(&optee->wait_queue, arg->params[0].u.value.b);
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break;
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case OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP:
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wq_wakeup(&optee->wait_queue, arg->params[0].u.value.b);
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break;
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default:
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goto bad;
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}
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
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{
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u32 msec_to_wait;
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if (arg->num_params != 1)
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goto bad;
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if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
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goto bad;
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msec_to_wait = arg->params[0].u.value.a;
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/* set task's state to interruptible sleep */
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set_current_state(TASK_INTERRUPTIBLE);
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/* take a nap */
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msleep(msec_to_wait);
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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static void handle_rpc_supp_cmd(struct tee_context *ctx,
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struct optee_msg_arg *arg)
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{
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struct tee_param *params;
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arg->ret_origin = TEEC_ORIGIN_COMMS;
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params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
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GFP_KERNEL);
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if (!params) {
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arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
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return;
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}
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if (optee_from_msg_param(params, arg->num_params, arg->params)) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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goto out;
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}
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arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
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if (optee_to_msg_param(arg->params, arg->num_params, params))
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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out:
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kfree(params);
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}
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static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
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{
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u32 ret;
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struct tee_param param;
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struct optee *optee = tee_get_drvdata(ctx->teedev);
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struct tee_shm *shm;
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param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
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param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
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param.u.value.b = sz;
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param.u.value.c = 0;
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ret = optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_ALLOC, 1, ¶m);
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if (ret)
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return ERR_PTR(-ENOMEM);
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mutex_lock(&optee->supp.ctx_mutex);
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/* Increases count as secure world doesn't have a reference */
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shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
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mutex_unlock(&optee->supp.ctx_mutex);
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return shm;
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}
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static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
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struct optee_msg_arg *arg)
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{
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phys_addr_t pa;
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struct tee_shm *shm;
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size_t sz;
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size_t n;
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arg->ret_origin = TEEC_ORIGIN_COMMS;
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if (!arg->num_params ||
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arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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return;
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}
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for (n = 1; n < arg->num_params; n++) {
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if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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return;
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}
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}
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sz = arg->params[0].u.value.b;
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switch (arg->params[0].u.value.a) {
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case OPTEE_MSG_RPC_SHM_TYPE_APPL:
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shm = cmd_alloc_suppl(ctx, sz);
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break;
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case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
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shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED);
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break;
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default:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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return;
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}
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if (IS_ERR(shm)) {
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arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
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return;
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}
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if (tee_shm_get_pa(shm, 0, &pa)) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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goto bad;
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}
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arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
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arg->params[0].u.tmem.buf_ptr = pa;
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arg->params[0].u.tmem.size = sz;
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arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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tee_shm_free(shm);
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}
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static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
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{
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struct tee_param param;
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param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
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param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
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param.u.value.b = tee_shm_get_id(shm);
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param.u.value.c = 0;
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/*
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* Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
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* world has released its reference.
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*
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* It's better to do this before sending the request to supplicant
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* as we'd like to let the process doing the initial allocation to
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* do release the last reference too in order to avoid stacking
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* many pending fput() on the client process. This could otherwise
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* happen if secure world does many allocate and free in a single
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* invoke.
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*/
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tee_shm_put(shm);
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optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_FREE, 1, ¶m);
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}
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static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
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struct optee_msg_arg *arg)
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{
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struct tee_shm *shm;
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arg->ret_origin = TEEC_ORIGIN_COMMS;
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if (arg->num_params != 1 ||
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arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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return;
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}
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shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
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switch (arg->params[0].u.value.a) {
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case OPTEE_MSG_RPC_SHM_TYPE_APPL:
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cmd_free_suppl(ctx, shm);
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break;
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case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
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tee_shm_free(shm);
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break;
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default:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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arg->ret = TEEC_SUCCESS;
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}
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static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
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struct tee_shm *shm)
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{
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struct optee_msg_arg *arg;
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arg = tee_shm_get_va(shm, 0);
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if (IS_ERR(arg)) {
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pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
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return;
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}
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switch (arg->cmd) {
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case OPTEE_MSG_RPC_CMD_GET_TIME:
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handle_rpc_func_cmd_get_time(arg);
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break;
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case OPTEE_MSG_RPC_CMD_WAIT_QUEUE:
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handle_rpc_func_cmd_wq(optee, arg);
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break;
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case OPTEE_MSG_RPC_CMD_SUSPEND:
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handle_rpc_func_cmd_wait(arg);
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break;
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case OPTEE_MSG_RPC_CMD_SHM_ALLOC:
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handle_rpc_func_cmd_shm_alloc(ctx, arg);
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break;
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case OPTEE_MSG_RPC_CMD_SHM_FREE:
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handle_rpc_func_cmd_shm_free(ctx, arg);
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break;
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default:
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handle_rpc_supp_cmd(ctx, arg);
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}
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}
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/**
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* optee_handle_rpc() - handle RPC from secure world
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* @ctx: context doing the RPC
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* @param: value of registers for the RPC
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*
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* Result of RPC is written back into @param.
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*/
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void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param)
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{
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struct tee_device *teedev = ctx->teedev;
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struct optee *optee = tee_get_drvdata(teedev);
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struct tee_shm *shm;
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phys_addr_t pa;
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switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
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case OPTEE_SMC_RPC_FUNC_ALLOC:
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shm = tee_shm_alloc(ctx, param->a1, TEE_SHM_MAPPED);
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if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
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reg_pair_from_64(¶m->a1, ¶m->a2, pa);
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reg_pair_from_64(¶m->a4, ¶m->a5,
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(unsigned long)shm);
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} else {
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param->a1 = 0;
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param->a2 = 0;
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param->a4 = 0;
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param->a5 = 0;
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}
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break;
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case OPTEE_SMC_RPC_FUNC_FREE:
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shm = reg_pair_to_ptr(param->a1, param->a2);
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tee_shm_free(shm);
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break;
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case OPTEE_SMC_RPC_FUNC_IRQ:
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/*
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* An IRQ was raised while secure world was executing,
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* since all IRQs are handled in Linux a dummy RPC is
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* performed to let Linux take the IRQ through the normal
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* vector.
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*/
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break;
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case OPTEE_SMC_RPC_FUNC_CMD:
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shm = reg_pair_to_ptr(param->a1, param->a2);
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handle_rpc_func_cmd(ctx, optee, shm);
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break;
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default:
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pr_warn("Unknown RPC func 0x%x\n",
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(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
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break;
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}
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param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
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}
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Block a user