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https://github.com/ibm-s390-linux/s390-tools.git
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27a562da0a
Program reads complete counter sets from any CPU by opening device /dev/hwctr which is available with linux version 5.12. The counter sets and CPUs can be specified on the command line. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
93 lines
3.6 KiB
C
93 lines
3.6 KiB
C
/* Copyright IBM Corp. 2021
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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/*
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* CPU Measurement counter facility application for device driver.
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*
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* Ioctl system call definitions.
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*/
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#ifndef LSHWC_H
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#define LSHWC_H
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#include <sys/ioctl.h>
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enum {
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S390_HWCTR_BASIC = 0x2, /* BASIC counter set */
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S390_HWCTR_USER = 0x4, /* Problem-State Counter Set */
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S390_HWCTR_CRYPTO = 0x8, /* Crypto-Activity Counter Set */
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S390_HWCTR_EXT = 0x1, /* Extended Counter Set */
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S390_HWCTR_MT_DIAG = 0x20, /* MT-diagnostic Counter Set */
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S390_HWCTR_ALL = S390_HWCTR_BASIC | S390_HWCTR_USER |
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S390_HWCTR_CRYPTO | S390_HWCTR_EXT |
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S390_HWCTR_MT_DIAG
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};
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/* The ioctl(..., S390_HWCTR_READ, ...) is the only subcommand which returns
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* data. It requires member data_bytes to be positive and indicates the
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* maximum amount of data available to store counter set data. The other
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* ioctl() subcommands do not use this member and it should be set to zero.
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*
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* The cpuset data is flattened using the following scheme, stored in member
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* data:
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*
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* 0x0 0x8 0xc 0x10 0x14 0x18 0x20 0x28 0xU-1
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* +---------+-----+---------+-----+---------+-----+-----+------+------+
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* | no_cpus | cpu | no_sets | set | no_cnts | cv1 | cv2 | .... | cv_n |
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* +---------+-----+---------+-----+---------+-----+-----+------+------+
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*
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* 0xU 0xU+4 0xU+8 0xU+10 0xV-1
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* +-----+---------+-----+-----+------+------+
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* | set | no_cnts | cv1 | cv2 | .... | cv_n |
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* +-----+---------+-----+-----+------+------+
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*
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* 0xV 0xV+4 0xV+8 0xV+c
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* +-----+---------+-----+---------+-----+-----+------+------+
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* | cpu | no_sets | set | no_cnts | cv1 | cv2 | .... | cv_n |
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* +-----+---------+-----+---------+-----+-----+------+------+
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*
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* U and V denote arbitrary hexadezimal addresses.
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* In fact the first int represents the number of CPUs data was extracted
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* from. This is followed by CPU number and number of counter sets extracted.
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* Both are two integer values. This is followed by the set number and number
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* of counters extracted. Both are two integer values. This is followed by
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* the counter values, each element is eight bytes in size.
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*/
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struct s390_hwctr_start { /* Set CPUs to operate on */
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__u64 version; /* Version of interface */
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__u64 data_bytes; /* # of bytes required */
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__u64 cpumask_len; /* Length of CPU mask in bytes */
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__u64 *cpumask; /* Pointer to CPU mask */
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__u64 counter_sets; /* Bit mask of counter set to get */
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};
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struct s390_hwctr_setdata { /* Counter set data */
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__u32 set; /* Counter set number */
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__u32 no_cnts; /* # of counters stored in cv[] */
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__u64 cv[0]; /* Counter values (variable length) */
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};
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struct s390_hwctr_cpudata { /* Counter set data per CPU */
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__u32 cpu_nr; /* Counter set number */
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__u32 no_sets; /* # of counters sets in data[] */
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struct s390_hwctr_setdata data[0];
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};
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struct s390_hwctr_read { /* Structure to get all ctr sets */
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__u64 no_cpus; /* Total # of CPUs data taken from */
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struct s390_hwctr_cpudata data[0];
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};
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#define S390_HWCTR_MAGIC 'C' /* Random magic # for ioctls */
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#define S390_HWCTR_START _IOWR(S390_HWCTR_MAGIC, 1, struct s390_hwctr_start)
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#define S390_HWCTR_STOP _IO(S390_HWCTR_MAGIC, 2)
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#define S390_HWCTR_READ _IOWR(S390_HWCTR_MAGIC, 3, struct s390_hwctr_read)
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#define S390_HWCTR_START_VERSION 1 /* Version # s390_hwctr_start */
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#define S390_HWCTR_DEVICE "/dev/hwctr" /* Device name */
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#endif
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