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 <tmricht@linux.ibm.com>
 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