[deliverable/linux.git] / drivers / s390 / block / dasd_cmb.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");
Commit	Line	Data
1da177e4	1	/*
4beb3709	2	* linux/drivers/s390/block/dasd_cmb.c ($Revision: 1.9 $)
1da177e4 LT	3	*
	4	* Linux on zSeries Channel Measurement Facility support
	5	* (dasd device driver interface)
	6	*
	7	* Copyright 2000,2003 IBM Corporation
	8	*
	9	* Author: Arnd Bergmann <arndb@de.ibm.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2, or (at your option)
	14	* any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25	#include <linux/init.h>
1da177e4 LT	26	#include <linux/module.h>
	27	#include <asm/ccwdev.h>
	28	#include <asm/cmb.h>
	29
	30	#include "dasd_int.h"
	31
	32	static int
	33	dasd_ioctl_cmf_enable(struct block_device *bdev, int no, long args)
	34	{
	35	struct dasd_device *device;
	36
	37	device = bdev->bd_disk->private_data;
	38	if (!device)
	39	return -EINVAL;
	40
	41	return enable_cmf(device->cdev);
	42	}
	43
	44	static int
	45	dasd_ioctl_cmf_disable(struct block_device *bdev, int no, long args)
	46	{
	47	struct dasd_device *device;
	48
	49	device = bdev->bd_disk->private_data;
	50	if (!device)
	51	return -EINVAL;
	52
	53	return disable_cmf(device->cdev);
	54	}
	55
	56	static int
	57	dasd_ioctl_readall_cmb(struct block_device *bdev, int no, long args)
	58	{
	59	struct dasd_device *device;
	60	struct cmbdata __user *udata;
	61	struct cmbdata data;
	62	size_t size;
	63	int ret;
	64
	65	device = bdev->bd_disk->private_data;
	66	if (!device)
	67	return -EINVAL;
	68	udata = (void __user *) args;
	69	size = _IOC_SIZE(no);
	70
	71	if (!access_ok(VERIFY_WRITE, udata, size))
	72	return -EFAULT;
	73	ret = cmf_readall(device->cdev, &data);
	74	if (ret)
	75	return ret;
	76	if (copy_to_user(udata, &data, min(size, sizeof(*udata))))
	77	return -EFAULT;
	78	return 0;
	79	}
	80
	81	/* module initialization below here. dasd already provides a mechanism
	82	* to dynamically register ioctl functions, so we simply use this. */
	83	static inline int
	84	ioctl_reg(unsigned int no, dasd_ioctl_fn_t handler)
	85	{
4beb3709	86	return dasd_ioctl_no_register(THIS_MODULE, no, handler);
1da177e4 LT	87	}
	88
	89	static inline void
	90	ioctl_unreg(unsigned int no, dasd_ioctl_fn_t handler)
	91	{
	92	dasd_ioctl_no_unregister(THIS_MODULE, no, handler);
1da177e4 LT	93	}
	94
	95	static void
	96	dasd_cmf_exit(void)
	97	{
	98	ioctl_unreg(BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
	99	ioctl_unreg(BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
	100	ioctl_unreg(BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
	101	}
	102
	103	static int __init
	104	dasd_cmf_init(void)
	105	{
	106	int ret;
	107	ret = ioctl_reg (BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
	108	if (ret)
	109	goto err;
	110	ret = ioctl_reg (BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
	111	if (ret)
	112	goto err;
	113	ret = ioctl_reg (BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
	114	if (ret)
	115	goto err;
	116
	117	return 0;
	118	err:
	119	dasd_cmf_exit();
	120
	121	return ret;
	122	}
	123
	124	module_init(dasd_cmf_init);
	125	module_exit(dasd_cmf_exit);
	126
	127	MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
	128	MODULE_LICENSE("GPL");
	129	MODULE_DESCRIPTION("channel measurement facility interface for dasd\n"
	130	"Copyright 2003 IBM Corporation\n");