1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * Counter facility support definitions for the Linux perf
  4 *
  5 * Copyright IBM Corp. 2019
  6 * Author(s): Hendrik Brueckner <brueckner@linux.ibm.com>
  7 */
  8#ifndef _ASM_S390_CPU_MCF_H
  9#define _ASM_S390_CPU_MCF_H
 10
 11#include <linux/perf_event.h>
 12#include <asm/cpu_mf.h>
 13
 14enum cpumf_ctr_set {
 15	CPUMF_CTR_SET_BASIC   = 0,    /* Basic Counter Set */
 16	CPUMF_CTR_SET_USER    = 1,    /* Problem-State Counter Set */
 17	CPUMF_CTR_SET_CRYPTO  = 2,    /* Crypto-Activity Counter Set */
 18	CPUMF_CTR_SET_EXT     = 3,    /* Extended Counter Set */
 19	CPUMF_CTR_SET_MT_DIAG = 4,    /* MT-diagnostic Counter Set */
 20
 21	/* Maximum number of counter sets */
 22	CPUMF_CTR_SET_MAX,
 23};
 24
 25#define CPUMF_LCCTL_ENABLE_SHIFT    16
 26#define CPUMF_LCCTL_ACTCTL_SHIFT     0
 27
 28static inline void ctr_set_enable(u64 *state, u64 ctrsets)
 29{
 30	*state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
 31}
 32
 33static inline void ctr_set_disable(u64 *state, u64 ctrsets)
 34{
 35	*state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
 36}
 37
 38static inline void ctr_set_start(u64 *state, u64 ctrsets)
 39{
 40	*state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
 41}
 42
 43static inline void ctr_set_stop(u64 *state, u64 ctrsets)
 44{
 45	*state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
 46}
 47
 48static inline int ctr_stcctm(enum cpumf_ctr_set set, u64 range, u64 *dest)
 49{
 50	switch (set) {
 51	case CPUMF_CTR_SET_BASIC:
 52		return stcctm(BASIC, range, dest);
 53	case CPUMF_CTR_SET_USER:
 54		return stcctm(PROBLEM_STATE, range, dest);
 55	case CPUMF_CTR_SET_CRYPTO:
 56		return stcctm(CRYPTO_ACTIVITY, range, dest);
 57	case CPUMF_CTR_SET_EXT:
 58		return stcctm(EXTENDED, range, dest);
 59	case CPUMF_CTR_SET_MT_DIAG:
 60		return stcctm(MT_DIAG_CLEARING, range, dest);
 61	case CPUMF_CTR_SET_MAX:
 62		return 3;
 63	}
 64	return 3;
 65}
 66
 67struct cpu_cf_events {
 68	struct cpumf_ctr_info	info;
 69	atomic_t		ctr_set[CPUMF_CTR_SET_MAX];
 70	atomic64_t		alert;
 71	u64			state;		/* For perf_event_open SVC */
 72	u64			dev_state;	/* For /dev/hwctr */
 73	unsigned int		flags;
 74	size_t used;			/* Bytes used in data */
 75	size_t usedss;			/* Bytes used in start/stop */
 76	unsigned char start[PAGE_SIZE];	/* Counter set at event add */
 77	unsigned char stop[PAGE_SIZE];	/* Counter set at event delete */
 78	unsigned char data[PAGE_SIZE];	/* Counter set at /dev/hwctr */
 79	unsigned int sets;		/* # Counter set saved in memory */
 80};
 81DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
 82
 83bool kernel_cpumcf_avail(void);
 84int __kernel_cpumcf_begin(void);
 85unsigned long kernel_cpumcf_alert(int clear);
 86void __kernel_cpumcf_end(void);
 87
 88static inline int kernel_cpumcf_begin(void)
 89{
 90	if (!cpum_cf_avail())
 91		return -ENODEV;
 92
 93	preempt_disable();
 94	return __kernel_cpumcf_begin();
 95}
 96static inline void kernel_cpumcf_end(void)
 97{
 98	__kernel_cpumcf_end();
 99	preempt_enable();
100}
101
102/* Return true if store counter set multiple instruction is available */
103static inline int stccm_avail(void)
104{
105	return test_facility(142);
106}
107
108size_t cpum_cf_ctrset_size(enum cpumf_ctr_set ctrset,
109			   struct cpumf_ctr_info *info);
110int cfset_online_cpu(unsigned int cpu);
111int cfset_offline_cpu(unsigned int cpu);
112#endif /* _ASM_S390_CPU_MCF_H */