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/*
* sysipc_ioctl.c
*
* This file implements all the ioctl operations required on the sysmgr
* module.
*
* Copyright (C) 2008-2009 Texas Instruments, Inc.
*
* This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
/* Standard headers */
#include <linux/types.h>
/* Linux headers */
#include <linux/uaccess.h>
#include <linux/bug.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
/* Module Headers */
#include <ipc.h>
#include <sysipc_ioctl.h>
/*#include <platform.h>*/
static struct resource_info *find_sysipc_resource(
struct ipc_process_context *pr_ctxt,
unsigned int cmd,
struct sysipc_cmd_args *cargs)
{
struct resource_info *info = NULL;
bool found = false;
spin_lock(&pr_ctxt->res_lock);
list_for_each_entry(info, &pr_ctxt->resources, res) {
struct sysipc_cmd_args *args =
(struct sysipc_cmd_args *)info->data;
if (info->cmd == cmd) {
switch (cmd) {
case CMD_IPC_CONTROL:
{
s32 cmd_id = args->args.control.cmd_id;
s32 t_cmd_id = cargs->args.control.cmd_id;
u16 proc_id = args->args.control.proc_id;
u16 t_proc_id = cargs->args.control.proc_id;
if (cmd_id == t_cmd_id && proc_id == t_proc_id)
found = true;
break;
}
case CMD_IPC_DESTROY:
{
found = true;
break;
}
}
if (found == true)
break;
}
}
spin_unlock(&pr_ctxt->res_lock);
if (found == false)
info = NULL;
return info;
}
/*
* ioctl interface to ipc_setup function
*/
static inline int sysipc_ioctl_setup(struct sysipc_cmd_args *cargs)
{
s32 retval = 0;
unsigned long size;
struct ipc_config config;
size = copy_from_user(&config, (void __user *)cargs->args.setup.config,
sizeof(struct ipc_config));
if (size) {
retval = -EFAULT;
goto exit;
}
cargs->api_status = ipc_setup(&config);
exit:
return retval;
}
/*
* ioctl interface to ipc_control function
*/
static inline int sysipc_ioctl_control(struct sysipc_cmd_args *cargs)
{
cargs->api_status = ipc_control(cargs->args.control.proc_id,
cargs->args.control.cmd_id,
cargs->args.control.arg);
return 0;
}
/*
* ioctl interface to ipc_read_config function
*/
static inline int sysipc_ioctl_read_config(struct sysipc_cmd_args *cargs)
{
s32 retval = 0;
unsigned long size;
void *cfg = NULL;
cfg = kzalloc(cargs->args.read_config.size, GFP_KERNEL);
if (cfg == NULL) {
retval = -ENOMEM;
goto exit;
}
cargs->api_status = ipc_read_config(
cargs->args.read_config.remote_proc_id,
cargs->args.read_config.tag, cfg,
cargs->args.read_config.size);
size = copy_to_user((void __user *)cargs->args.read_config.cfg, cfg,
cargs->args.read_config.size);
if (size)
retval = -EFAULT;
kfree(cfg);
exit:
return retval;
}
/*
* ioctl interface to ipc_write_config function
*/
static inline int sysipc_ioctl_write_config(struct sysipc_cmd_args *cargs)
{
s32 retval = 0;
unsigned long size;
void *cfg = NULL;
cfg = kzalloc(cargs->args.write_config.size, GFP_KERNEL);
if (cfg == NULL) {
retval = -ENOMEM;
goto exit;
}
size = copy_from_user(cfg, (void __user *)cargs->args.write_config.cfg,
cargs->args.write_config.size);
if (size) {
retval = -EFAULT;
goto exit;
}
cargs->api_status = ipc_write_config(
cargs->args.write_config.remote_proc_id,
cargs->args.write_config.tag, cfg,
cargs->args.write_config.size);
kfree(cfg);
exit:
return retval;
}
/*
* ioctl interface to sysmgr_destroy function
*/
static inline int sysipc_ioctl_destroy(struct sysipc_cmd_args *cargs)
{
cargs->api_status = ipc_destroy();
return 0;
}
/*
* ioctl interface function for sysmgr module
*/
int sysipc_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long args, bool user)
{
int status = 0;
struct sysipc_cmd_args __user *uarg =
(struct sysipc_cmd_args __user *)args;
struct sysipc_cmd_args cargs;
unsigned long size;
struct ipc_process_context *pr_ctxt =
(struct ipc_process_context *)filp->private_data;
if (user == true) {
#ifdef CONFIG_SYSLINK_RECOVERY
if (ipc_recovering()) {
status = -EIO;
goto exit;
}
#endif
if (_IOC_DIR(cmd) & _IOC_READ)
status = !access_ok(VERIFY_WRITE, uarg, _IOC_SIZE(cmd));
else if (_IOC_DIR(cmd) & _IOC_WRITE)
status = !access_ok(VERIFY_READ, uarg, _IOC_SIZE(cmd));
if (status) {
status = -EFAULT;
goto exit;
}
/* Copy the full args from user-side */
size = copy_from_user(&cargs, uarg,
sizeof(struct sysipc_cmd_args));
if (size) {
status = -EFAULT;
goto exit;
}
} else {
if (args != 0)
memcpy(&cargs, (void *)args,
sizeof(struct sysipc_cmd_args));
}
switch (cmd) {
case CMD_IPC_SETUP:
status = sysipc_ioctl_setup(&cargs);
if (status >= 0)
add_pr_res(pr_ctxt, CMD_IPC_DESTROY, NULL);
break;
case CMD_IPC_DESTROY:
{
struct resource_info *info = NULL;
info = find_sysipc_resource(pr_ctxt, CMD_IPC_DESTROY,
&cargs);
status = sysipc_ioctl_destroy(&cargs);
remove_pr_res(pr_ctxt, info);
break;
}
case CMD_IPC_CONTROL:
{
u32 id = cargs.args.control.proc_id;
u32 ctrl_cmd = cargs.args.control.cmd_id;
struct resource_info *info = NULL;
info = find_sysipc_resource(pr_ctxt, CMD_IPC_CONTROL,
&cargs);
status = sysipc_ioctl_control(&cargs);
if (ctrl_cmd == IPC_CONTROLCMD_STARTCALLBACK) {
if (status >= 0) {
struct sysipc_cmd_args *temp = kmalloc(
sizeof(struct sysipc_cmd_args),
GFP_KERNEL);
if (WARN_ON(!temp)) {
status = -ENOMEM;
goto exit;
}
temp->args.control.cmd_id =
IPC_CONTROLCMD_STOPCALLBACK;
temp->args.control.proc_id = id;
temp->args.control.arg = NULL;
add_pr_res(pr_ctxt, CMD_IPC_CONTROL,
(void *)temp);
}
} else if (ctrl_cmd == IPC_CONTROLCMD_STOPCALLBACK) {
remove_pr_res(pr_ctxt, info);
}
break;
}
case CMD_IPC_READCONFIG:
status = sysipc_ioctl_read_config(&cargs);
break;
case CMD_IPC_WRITECONFIG:
status = sysipc_ioctl_write_config(&cargs);
break;
default:
WARN_ON(cmd);
status = -ENOTTY;
break;
}
if (status < 0)
goto exit;
if (user == true) {
/* Copy the full args to the user-side. */
size = copy_to_user(uarg, &cargs,
sizeof(struct sysipc_cmd_args));
if (size) {
status = -EFAULT;
goto exit;
}
}
exit:
return status;
}
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