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s390/hypfs: Add diagnose 0c support

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With this feature, you can read the CPU performance metrics provided by the
z/VM diagnose 0C. This then allows to get the management time for each
online CPU of the guest where the diagnose is executed.

The new debugfs file /sys/kernel/debug/s390_hypfs/diag_0c exports the
diag0C binary data to user space via an open/read/close interface.

The binary data consists out of a header structure followed by an
array that contains the diagnose 0c data for each online CPU.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
2015-02-09 14:49:10 +01:00
committed by Martin Schwidefsky
parent 45cce4ccaf
commit 34c0dad752
5 changed files with 184 additions and 4 deletions
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35
arch/s390/include/uapi/asm/hypfs.h
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@@ -1,16 +1,19 @@
/*
* IOCTL interface for hypfs
* Structures for hypfs interface
*
* Copyright IBM Corp. 2013
*
* Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#ifndef _ASM_HYPFS_CTL_H
#define _ASM_HYPFS_CTL_H
#ifndef _ASM_HYPFS_H
#define _ASM_HYPFS_H
#include <linux/types.h>
/*
* IOCTL for binary interface /sys/kernel/debug/diag_304
*/
struct hypfs_diag304 {
__u32 args[2];
__u64 data;
@@ -22,4 +25,30 @@ struct hypfs_diag304 {
#define HYPFS_DIAG304 \
_IOWR(HYPFS_IOCTL_MAGIC, 0x20, struct hypfs_diag304)
/*
* Structures for binary interface /sys/kernel/debug/diag_0c
*/
struct hypfs_diag0c_hdr {
__u64 len; /* Length of diag0c buffer without header */
__u16 version; /* Version of header */
char reserved1[6]; /* Reserved */
char tod_ext[16]; /* TOD clock for diag0c */
__u64 count; /* Number of entries (CPUs) in diag0c array */
char reserved2[24]; /* Reserved */
};
struct hypfs_diag0c_entry {
char date[8]; /* MM/DD/YY in EBCDIC */
char time[8]; /* HH:MM:SS in EBCDIC */
__u64 virtcpu; /* Virtual time consumed by the virt CPU (us) */
__u64 totalproc; /* Total of virtual and simulation time (us) */
__u32 cpu; /* Linux logical CPU number */
__u32 reserved; /* Align to 8 byte */
};
struct hypfs_diag0c_data {
struct hypfs_diag0c_hdr hdr; /* 64 byte header */
struct hypfs_diag0c_entry entry[]; /* diag0c entry array */
};
#endif