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540 lines
12 KiB
540 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015-2016, Linaro Limited |
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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/i2c.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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#include "optee_rpc_cmd.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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ktime_get_real_ts64(&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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#if IS_REACHABLE(CONFIG_I2C) |
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static void handle_rpc_func_cmd_i2c_transfer(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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struct i2c_adapter *adapter; |
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struct i2c_msg msg = { }; |
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size_t i; |
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int ret = -EOPNOTSUPP; |
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u8 attr[] = { |
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, |
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT, |
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TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT, |
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT, |
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}; |
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if (arg->num_params != ARRAY_SIZE(attr)) { |
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arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
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return; |
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} |
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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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goto bad; |
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for (i = 0; i < arg->num_params; i++) { |
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if (params[i].attr != attr[i]) |
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goto bad; |
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} |
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adapter = i2c_get_adapter(params[0].u.value.b); |
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if (!adapter) |
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goto bad; |
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if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) { |
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if (!i2c_check_functionality(adapter, |
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I2C_FUNC_10BIT_ADDR)) { |
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i2c_put_adapter(adapter); |
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goto bad; |
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} |
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msg.flags = I2C_M_TEN; |
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} |
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msg.addr = params[0].u.value.c; |
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msg.buf = params[2].u.memref.shm->kaddr; |
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msg.len = params[2].u.memref.size; |
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switch (params[0].u.value.a) { |
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case OPTEE_RPC_I2C_TRANSFER_RD: |
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msg.flags |= I2C_M_RD; |
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break; |
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case OPTEE_RPC_I2C_TRANSFER_WR: |
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break; |
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default: |
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i2c_put_adapter(adapter); |
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goto bad; |
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} |
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ret = i2c_transfer(adapter, &msg, 1); |
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if (ret < 0) { |
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arg->ret = TEEC_ERROR_COMMUNICATION; |
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} else { |
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params[3].u.value.a = msg.len; |
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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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else |
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arg->ret = TEEC_SUCCESS; |
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} |
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i2c_put_adapter(adapter); |
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kfree(params); |
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return; |
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bad: |
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kfree(params); |
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arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
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} |
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#else |
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static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx, |
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struct optee_msg_arg *arg) |
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{ |
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arg->ret = TEEC_ERROR_NOT_SUPPORTED; |
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} |
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#endif |
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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_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_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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/* Go to interruptible sleep */ |
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msleep_interruptible(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_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_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.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.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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struct optee_call_ctx *call_ctx) |
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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_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_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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sz = tee_shm_get_size(shm); |
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if (tee_shm_is_registered(shm)) { |
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struct page **pages; |
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u64 *pages_list; |
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size_t page_num; |
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pages = tee_shm_get_pages(shm, &page_num); |
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if (!pages || !page_num) { |
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arg->ret = TEEC_ERROR_OUT_OF_MEMORY; |
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goto bad; |
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} |
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pages_list = optee_allocate_pages_list(page_num); |
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if (!pages_list) { |
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arg->ret = TEEC_ERROR_OUT_OF_MEMORY; |
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goto bad; |
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} |
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call_ctx->pages_list = pages_list; |
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call_ctx->num_entries = page_num; |
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arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT | |
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OPTEE_MSG_ATTR_NONCONTIG; |
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/* |
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* In the least bits of u.tmem.buf_ptr we store buffer offset |
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* from 4k page, as described in OP-TEE ABI. |
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*/ |
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arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) | |
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(tee_shm_get_page_offset(shm) & |
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(OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1)); |
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arg->params[0].u.tmem.size = tee_shm_get_size(shm); |
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arg->params[0].u.tmem.shm_ref = (unsigned long)shm; |
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optee_fill_pages_list(pages_list, pages, page_num, |
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tee_shm_get_page_offset(shm)); |
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} else { |
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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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} |
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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_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_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_RPC_SHM_TYPE_APPL: |
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cmd_free_suppl(ctx, shm); |
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break; |
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case OPTEE_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 free_pages_list(struct optee_call_ctx *call_ctx) |
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{ |
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if (call_ctx->pages_list) { |
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optee_free_pages_list(call_ctx->pages_list, |
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call_ctx->num_entries); |
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call_ctx->pages_list = NULL; |
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call_ctx->num_entries = 0; |
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} |
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} |
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void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx) |
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{ |
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free_pages_list(call_ctx); |
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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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struct optee_call_ctx *call_ctx) |
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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_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_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_RPC_CMD_SUSPEND: |
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handle_rpc_func_cmd_wait(arg); |
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break; |
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case OPTEE_RPC_CMD_SHM_ALLOC: |
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free_pages_list(call_ctx); |
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handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx); |
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break; |
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case OPTEE_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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case OPTEE_RPC_CMD_I2C_TRANSFER: |
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handle_rpc_func_cmd_i2c_transfer(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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* @call_ctx: call context. Preserved during one OP-TEE invocation |
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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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struct optee_call_ctx *call_ctx) |
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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_FOREIGN_INTR: |
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/* |
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* A foreign interrupt was raised while secure world was |
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* executing, since they are handled in Linux a dummy RPC is |
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* performed to let Linux take the interrupt 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, call_ctx); |
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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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