LXR linux/arch/s390/include/asm/cpu

   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 */
 113