| /* |
| * 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"); |