131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*
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* linux/drivers/s390/block/dasd_cmb.c ($Revision: 1.9 $)
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*
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* Linux on zSeries Channel Measurement Facility support
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* (dasd device driver interface)
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*
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* Copyright 2000,2003 IBM Corporation
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/ccwdev.h>
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#include <asm/cmb.h>
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#include "dasd_int.h"
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static int
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dasd_ioctl_cmf_enable(struct block_device *bdev, int no, long args)
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{
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struct dasd_device *device;
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device = bdev->bd_disk->private_data;
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if (!device)
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return -EINVAL;
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return enable_cmf(device->cdev);
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}
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static int
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dasd_ioctl_cmf_disable(struct block_device *bdev, int no, long args)
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{
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struct dasd_device *device;
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device = bdev->bd_disk->private_data;
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if (!device)
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return -EINVAL;
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return disable_cmf(device->cdev);
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}
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static int
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dasd_ioctl_readall_cmb(struct block_device *bdev, int no, long args)
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{
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struct dasd_device *device;
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struct cmbdata __user *udata;
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struct cmbdata data;
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size_t size;
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int ret;
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device = bdev->bd_disk->private_data;
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if (!device)
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return -EINVAL;
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udata = (void __user *) args;
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size = _IOC_SIZE(no);
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if (!access_ok(VERIFY_WRITE, udata, size))
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return -EFAULT;
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ret = cmf_readall(device->cdev, &data);
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if (ret)
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return ret;
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if (copy_to_user(udata, &data, min(size, sizeof(*udata))))
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return -EFAULT;
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return 0;
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}
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/* module initialization below here. dasd already provides a mechanism
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* to dynamically register ioctl functions, so we simply use this. */
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static inline int
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ioctl_reg(unsigned int no, dasd_ioctl_fn_t handler)
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{
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return dasd_ioctl_no_register(THIS_MODULE, no, handler);
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}
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static inline void
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ioctl_unreg(unsigned int no, dasd_ioctl_fn_t handler)
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{
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dasd_ioctl_no_unregister(THIS_MODULE, no, handler);
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}
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static void
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dasd_cmf_exit(void)
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{
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ioctl_unreg(BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
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ioctl_unreg(BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
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ioctl_unreg(BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
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}
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static int __init
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dasd_cmf_init(void)
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{
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int ret;
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ret = ioctl_reg (BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
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if (ret)
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goto err;
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ret = ioctl_reg (BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
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if (ret)
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goto err;
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ret = ioctl_reg (BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
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if (ret)
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goto err;
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return 0;
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err:
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dasd_cmf_exit();
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return ret;
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}
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module_init(dasd_cmf_init);
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module_exit(dasd_cmf_exit);
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MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("channel measurement facility interface for dasd\n"
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"Copyright 2003 IBM Corporation\n");
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