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/*
* Copyright (c) 2013 TRUSTONIC LIMITED
* All Rights Reserved.
*
* 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.
*/
/*
* MobiCore client library device management.
*
* Device and Trustlet Session management Functions.
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/device.h>
#include "mc_kernel_api.h"
#include "public/mobicore_driver_api.h"
#include "device.h"
#include "common.h"
static struct wsm *wsm_create(void *virt_addr, uint32_t len, uint32_t handle)
{
struct wsm *wsm;
wsm = kzalloc(sizeof(*wsm), GFP_KERNEL);
if (wsm == NULL) {
MCDRV_DBG_ERROR(mc_kapi, "Allocation failure");
return NULL;
}
wsm->virt_addr = virt_addr;
wsm->len = len;
wsm->handle = handle;
return wsm;
}
struct mcore_device_t *mcore_device_create(uint32_t device_id,
struct connection *connection)
{
struct mcore_device_t *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
MCDRV_DBG_ERROR(mc_kapi, "Allocation failure");
return NULL;
}
dev->device_id = device_id;
dev->connection = connection;
INIT_LIST_HEAD(&dev->session_vector);
INIT_LIST_HEAD(&dev->wsm_mmu_vector);
return dev;
}
void mcore_device_cleanup(struct mcore_device_t *dev)
{
struct session *tmp;
struct wsm *wsm;
struct list_head *pos, *q;
/*
* Delete all session objects. Usually this should not be needed
* as close_device() requires that all sessions have been closed before.
*/
list_for_each_safe(pos, q, &dev->session_vector) {
tmp = list_entry(pos, struct session, list);
list_del(pos);
session_cleanup(tmp);
}
/* Free all allocated WSM descriptors */
list_for_each_safe(pos, q, &dev->wsm_mmu_vector) {
wsm = list_entry(pos, struct wsm, list);
list_del(pos);
kfree(wsm);
}
connection_cleanup(dev->connection);
mcore_device_close(dev);
kfree(dev);
}
bool mcore_device_open(struct mcore_device_t *dev, const char *device_name)
{
dev->instance = mobicore_open();
return (dev->instance != NULL);
}
void mcore_device_close(struct mcore_device_t *dev)
{
mobicore_release(dev->instance);
}
bool mcore_device_has_sessions(struct mcore_device_t *dev)
{
return !list_empty(&dev->session_vector);
}
bool mcore_device_create_new_session(struct mcore_device_t *dev,
uint32_t session_id,
struct connection *connection)
{
/* Check if session_id already exists */
if (mcore_device_resolve_session_id(dev, session_id)) {
MCDRV_DBG_ERROR(mc_kapi,
" session %u already exists", session_id);
return false;
}
struct session *session =
session_create(session_id, dev->instance, connection);
if (session == NULL)
return false;
list_add_tail(&(session->list), &(dev->session_vector));
return true;
}
bool mcore_device_remove_session(struct mcore_device_t *dev,
uint32_t session_id)
{
bool ret = false;
struct session *tmp;
struct list_head *pos, *q;
list_for_each_safe(pos, q, &dev->session_vector) {
tmp = list_entry(pos, struct session, list);
if (tmp->session_id == session_id) {
list_del(pos);
session_cleanup(tmp);
ret = true;
break;
}
}
return ret;
}
struct session *mcore_device_resolve_session_id(struct mcore_device_t *dev,
uint32_t session_id)
{
struct session *ret = NULL;
struct session *tmp;
struct list_head *pos;
/* Get session for session_id */
list_for_each(pos, &dev->session_vector) {
tmp = list_entry(pos, struct session, list);
if (tmp->session_id == session_id) {
ret = tmp;
break;
}
}
return ret;
}
struct wsm *mcore_device_allocate_contiguous_wsm(struct mcore_device_t *dev,
uint32_t len)
{
struct wsm *wsm = NULL;
do {
if (len == 0)
break;
/* Allocate shared memory */
void *virt_addr;
uint32_t handle;
int ret = mobicore_allocate_wsm(dev->instance, len, &handle,
&virt_addr);
if (ret != 0)
break;
/* Register (vaddr) with device */
wsm = wsm_create(virt_addr, len, handle);
if (wsm == NULL) {
mobicore_free_wsm(dev->instance, handle);
break;
}
list_add_tail(&(wsm->list), &(dev->wsm_mmu_vector));
} while (0);
return wsm;
}
bool mcore_device_free_contiguous_wsm(struct mcore_device_t *dev,
struct wsm *wsm)
{
bool ret = false;
struct wsm *tmp;
struct list_head *pos;
list_for_each(pos, &dev->wsm_mmu_vector) {
tmp = list_entry(pos, struct wsm, list);
if (tmp == wsm) {
ret = true;
break;
}
}
if (ret) {
MCDRV_DBG_VERBOSE(mc_kapi,
"freeWsm virt_addr=0x%p, handle=%d",
wsm->virt_addr, wsm->handle);
/* ignore return code */
mobicore_free_wsm(dev->instance, wsm->handle);
list_del(pos);
kfree(wsm);
}
return ret;
}
struct wsm *mcore_device_find_contiguous_wsm(struct mcore_device_t *dev,
void *virt_addr)
{
struct wsm *wsm;
struct list_head *pos;
list_for_each(pos, &dev->wsm_mmu_vector) {
wsm = list_entry(pos, struct wsm, list);
if (virt_addr == wsm->virt_addr)
return wsm;
}
return NULL;
}
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