linux-stable/drivers/s390/char/vmcp.h
Christian Borntraeger d9d119f12f [S390] vmcp cleanup
A number of small changes to vmcp:
 - Change preferred email address.
 - Use PRINT_xxx machros from debug.h like most s390 drivers, define
   "vmcp:" as PRINTK_HEADER and wrap error message at column 80.
 - Add error number to error message.
 - Update copyright, as I touched this file.
 - Small whitespace diff.
 - Use mutex instead of semaphore (Thanks Heiko for the patch)
 - Don't register debug feature on failure.
 - Check debug feature registration on init to avoid a potential oops
   on unload if the debug feature could not be registered--> 2 more
   messages.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-07-17 13:36:19 +02:00

30 lines
849 B
C

/*
* Copyright (C) 2004, 2005 IBM Corporation
* Interface implementation for communication with the z/VM control program
* Version 1.0
* Author(s): Christian Borntraeger <cborntra@de.ibm.com>
*
*
* z/VMs CP offers the possibility to issue commands via the diagnose code 8
* this driver implements a character device that issues these commands and
* returns the answer of CP.
*
* The idea of this driver is based on cpint from Neale Ferguson
*/
#include <linux/ioctl.h>
#include <linux/mutex.h>
#define VMCP_GETCODE _IOR(0x10, 1, int)
#define VMCP_SETBUF _IOW(0x10, 2, int)
#define VMCP_GETSIZE _IOR(0x10, 3, int)
struct vmcp_session {
unsigned int bufsize;
char *response;
int resp_size;
int resp_code;
/* As we use copy_from/to_user, which might *
* sleep and cannot use a spinlock */
struct mutex mutex;
};