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/*
* Copyright (c) 2014, STMicroelectronics International N.V.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/anon_inodes.h>
#include <linux/semaphore.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/device.h>
#include "tee-op.h"
#include "tee_mem.h"
#include "tee_service.h"
#include "tee_supp_com.h"
#include "tee_driver.h"
enum teec_rpc_result tee_supp_cmd(struct tee_targetop *op,
uint32_t id, void *data,
unsigned int datalen)
{
struct device *dev = op->miscdev->this_device;
struct tee_rpc_priv_data *rpc = &tee_get_drvdata(dev)->rpc;
enum teec_rpc_result res = TEEC_RPC_FAIL;
size_t size; /* size of block */
struct task_struct *task = current;
dev_dbg(dev, "> tgid:[%d] op:[0x%p] id:[0x%x]\n",
task->tgid, (void *)op, id);
switch (id) {
case TEE_RPC_ICMD_ALLOCATE:
{
struct tee_rpc_alloc *alloc;
struct tee_shm *shmint;
alloc = (struct tee_rpc_alloc *)data;
size = alloc->size;
memset(alloc, 0, sizeof(struct tee_rpc_alloc));
shmint = tee_shm_allocate(op, 0, size, 0);
if (shmint == NULL)
break;
alloc->size = size;
alloc->data = (void *)shmint->paddr;
alloc->shm = shmint;
res = TEEC_RPC_OK;
break;
}
case TEE_RPC_ICMD_FREE:
{
struct tee_rpc_free *free;
free = (struct tee_rpc_free *)data;
tee_shm_unallocate(free->shm);
res = TEEC_RPC_OK;
break;
}
case TEE_RPC_ICMD_INVOKE:
{
if (sizeof(rpc->commToUser) < datalen)
break;
/*
* Don't allow interleaved requests (from two
* different threads) as the second request will
* overwrite the first request.
*/
mutex_lock(&rpc->reqsync);
mutex_lock(&rpc->outsync);
memcpy(&rpc->commToUser, data, datalen);
mutex_unlock(&rpc->outsync);
dev_dbg(dev, "Supplicant Cmd: %x. Give hand to supplicant\n",
rpc->commToUser.cmd);
up(&rpc->datatouser);
down(&rpc->datafromuser);
dev_dbg(dev, "Supplicant Cmd: %x. Give hand to fw\n",
rpc->commToUser.cmd);
mutex_lock(&rpc->insync);
memcpy(data, &rpc->commFromUser, datalen);
mutex_unlock(&rpc->insync);
mutex_unlock(&rpc->reqsync);
res = TEEC_RPC_OK;
break;
}
default:
/* not supported */
break;
}
dev_dbg(dev, "< res: [%d]\n", res);
return res;
}
ssize_t tee_supp_read(struct file *filp, char __user *buffer,
size_t length, loff_t *offset)
{
struct tee_session *ts = (struct tee_session *)(filp->private_data);
struct device *dev = ts->op->miscdev->this_device;
struct tee_rpc_priv_data *rpc = &tee_get_drvdata(dev)->rpc;
struct task_struct *task = current;
int ret;
if (down_interruptible(&rpc->datatouser))
return -ERESTARTSYS;
dev_dbg(dev, "> tgid:[%d] ts:[0x%p]\n", task->tgid, (void *)ts);
mutex_lock(&rpc->outsync);
ret =
sizeof(rpc->commToUser) - sizeof(rpc->commToUser.cmds) +
sizeof(rpc->commToUser.cmds[0]) * rpc->commToUser.nbr_bf;
if (length < ret) {
ret = -EINVAL;
} else {
if (copy_to_user(buffer, &rpc->commToUser, ret)) {
dev_err(dev,
"[%s] error, copy_to_user failed!\n", __func__);
ret = -EINVAL;
}
}
mutex_unlock(&rpc->outsync);
dev_dbg(dev, "< [%d]\n", ret);
return ret;
}
ssize_t tee_supp_write(struct file *filp, const char __user *buffer,
size_t length, loff_t *offset)
{
struct tee_session *ts = (struct tee_session *)(filp->private_data);
struct device *dev = ts->op->miscdev->this_device;
struct tee_rpc_priv_data *rpc = &tee_get_drvdata(dev)->rpc;
struct task_struct *task = current;
dev_dbg(dev, "> tgid:[%d] ts:[0x%p]\n", task->tgid, (void *)ts);
if (length > 0 && length < sizeof(rpc->commFromUser)) {
uint32_t i;
mutex_lock(&rpc->insync);
if (copy_from_user(&rpc->commFromUser, buffer, length)) {
dev_err(dev,
"[%s] error, tee_session copy_from_user failed\n",
__func__);
mutex_unlock(&rpc->insync);
return -EINVAL;
}
/* Translate virtual address of caller into physical address */
for (i = 0; i < rpc->commFromUser.nbr_bf; i++) {
if (rpc->commFromUser.cmds[i].type == TEE_RPC_BUFFER &&
rpc->commFromUser.cmds[i].buffer) {
struct vm_area_struct *vma =
find_vma(current->mm,
(unsigned long)rpc->commFromUser.
cmds[i].buffer);
if (vma != NULL) {
unsigned long paddr =
(unsigned long)vma->vm_private_data;
dev_dbg(dev, " gid2pa(0x%p => %lx)\n",
rpc->
commFromUser.cmds[i].buffer,
paddr);
rpc->commFromUser.cmds[i].buffer =
(void *)paddr;
} else
dev_dbg(dev,
" gid2pa(0x%p => NULL\n)",
rpc->commFromUser.cmds[i].buffer);
}
}
mutex_unlock(&rpc->insync);
up(&rpc->datafromuser);
dev_dbg(dev, "< [%zu]\n", length);
return length;
}
dev_dbg(dev, "< [0]\n");
return 0;
}
int tee_supp_init(struct tee_rpc_priv_data *rpc)
{
rpc->datafromuser = (struct semaphore)
__SEMAPHORE_INITIALIZER(rpc->datafromuser, 0);
rpc->datatouser = (struct semaphore)
__SEMAPHORE_INITIALIZER(rpc->datatouser, 0);
mutex_init(&rpc->outsync);
mutex_init(&rpc->insync);
mutex_init(&rpc->reqsync);
return 0;
}
void tee_supp_exit(void)
{
}
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