mirror of https://gitee.com/openkylin/linux.git
131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
|
|
* linux/drivers/s390/block/dasd_cmb.c ($Revision: 1.9 $)
|
|
*
|
|
* Linux on zSeries Channel Measurement Facility support
|
|
* (dasd device driver interface)
|
|
*
|
|
* Copyright 2000,2003 IBM Corporation
|
|
*
|
|
* Author: Arnd Bergmann <arndb@de.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/cmb.h>
|
|
|
|
#include "dasd_int.h"
|
|
|
|
static int
|
|
dasd_ioctl_cmf_enable(struct block_device *bdev, int no, long args)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = bdev->bd_disk->private_data;
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
return enable_cmf(device->cdev);
|
|
}
|
|
|
|
static int
|
|
dasd_ioctl_cmf_disable(struct block_device *bdev, int no, long args)
|
|
{
|
|
struct dasd_device *device;
|
|
|
|
device = bdev->bd_disk->private_data;
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
return disable_cmf(device->cdev);
|
|
}
|
|
|
|
static int
|
|
dasd_ioctl_readall_cmb(struct block_device *bdev, int no, long args)
|
|
{
|
|
struct dasd_device *device;
|
|
struct cmbdata __user *udata;
|
|
struct cmbdata data;
|
|
size_t size;
|
|
int ret;
|
|
|
|
device = bdev->bd_disk->private_data;
|
|
if (!device)
|
|
return -EINVAL;
|
|
udata = (void __user *) args;
|
|
size = _IOC_SIZE(no);
|
|
|
|
if (!access_ok(VERIFY_WRITE, udata, size))
|
|
return -EFAULT;
|
|
ret = cmf_readall(device->cdev, &data);
|
|
if (ret)
|
|
return ret;
|
|
if (copy_to_user(udata, &data, min(size, sizeof(*udata))))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/* module initialization below here. dasd already provides a mechanism
|
|
* to dynamically register ioctl functions, so we simply use this. */
|
|
static inline int
|
|
ioctl_reg(unsigned int no, dasd_ioctl_fn_t handler)
|
|
{
|
|
return dasd_ioctl_no_register(THIS_MODULE, no, handler);
|
|
}
|
|
|
|
static inline void
|
|
ioctl_unreg(unsigned int no, dasd_ioctl_fn_t handler)
|
|
{
|
|
dasd_ioctl_no_unregister(THIS_MODULE, no, handler);
|
|
}
|
|
|
|
static void
|
|
dasd_cmf_exit(void)
|
|
{
|
|
ioctl_unreg(BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
|
|
ioctl_unreg(BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
|
|
ioctl_unreg(BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
|
|
}
|
|
|
|
static int __init
|
|
dasd_cmf_init(void)
|
|
{
|
|
int ret;
|
|
ret = ioctl_reg (BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
|
|
if (ret)
|
|
goto err;
|
|
ret = ioctl_reg (BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
|
|
if (ret)
|
|
goto err;
|
|
ret = ioctl_reg (BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
dasd_cmf_exit();
|
|
|
|
return ret;
|
|
}
|
|
|
|
module_init(dasd_cmf_init);
|
|
module_exit(dasd_cmf_exit);
|
|
|
|
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("channel measurement facility interface for dasd\n"
|
|
"Copyright 2003 IBM Corporation\n");
|