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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * Copyright IBM Corp. 2021
4 * Interface implementation for communication with the CPU Measurement
5 * counter facility device driver.
6 *
7 * Author(s): Thomas Richter <[email protected]>
8 *
9 * Define for ioctl() commands to communicate with the CPU Measurement
10 * counter facility device driver.
11 */
12
13#ifndef _PERF_CPUM_CF_DIAG_H
14#define _PERF_CPUM_CF_DIAG_H
15
16#include <linux/ioctl.h>
17#include <linux/types.h>
18
19#define S390_HWCTR_DEVICE "hwctr"
20#define S390_HWCTR_START_VERSION 1
21
22struct s390_ctrset_start { /* Set CPUs to operate on */
23 __u64 version; /* Version of interface */
24 __u64 data_bytes; /* # of bytes required */
25 __u64 cpumask_len; /* Length of CPU mask in bytes */
26 __u64 *cpumask; /* Pointer to CPU mask */
27 __u64 counter_sets; /* Bit mask of counter sets to get */
28};
29
30struct s390_ctrset_setdata { /* Counter set data */
31 __u32 set; /* Counter set number */
32 __u32 no_cnts; /* # of counters stored in cv[] */
33 __u64 cv[]; /* Counter values (variable length) */
34};
35
36struct s390_ctrset_cpudata { /* Counter set data per CPU */
37 __u32 cpu_nr; /* CPU number */
38 __u32 no_sets; /* # of counters sets in data[] */
39 struct s390_ctrset_setdata data[];
40};
41
42struct s390_ctrset_read { /* Structure to get all ctr sets */
43 __u64 no_cpus; /* Total # of CPUs data taken from */
44 struct s390_ctrset_cpudata data[];
45};
46
47#define S390_HWCTR_MAGIC 'C' /* Random magic # for ioctls */
48#define S390_HWCTR_START _IOWR(S390_HWCTR_MAGIC, 1, struct s390_ctrset_start)
49#define S390_HWCTR_STOP _IO(S390_HWCTR_MAGIC, 2)
50#define S390_HWCTR_READ _IOWR(S390_HWCTR_MAGIC, 3, struct s390_ctrset_read)
51#endif