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d9d119f12f
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>
30 lines
849 B
C
30 lines
849 B
C
/*
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* Copyright (C) 2004, 2005 IBM Corporation
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* Interface implementation for communication with the z/VM control program
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* Version 1.0
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* Author(s): Christian Borntraeger <cborntra@de.ibm.com>
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*
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*
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* z/VMs CP offers the possibility to issue commands via the diagnose code 8
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* this driver implements a character device that issues these commands and
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* returns the answer of CP.
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*
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* The idea of this driver is based on cpint from Neale Ferguson
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*/
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#include <linux/ioctl.h>
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#include <linux/mutex.h>
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#define VMCP_GETCODE _IOR(0x10, 1, int)
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#define VMCP_SETBUF _IOW(0x10, 2, int)
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#define VMCP_GETSIZE _IOR(0x10, 3, int)
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struct vmcp_session {
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unsigned int bufsize;
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char *response;
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int resp_size;
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int resp_code;
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/* As we use copy_from/to_user, which might *
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* sleep and cannot use a spinlock */
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struct mutex mutex;
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};
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