arch/s390/include/asm/cpu_mcf.h

   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
  14 enum 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
  28 static inline void ctr_set_enable(u64 *state, u64 ctrsets)
  29 {
  30         *state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
  31 }
  32
  33 static inline void ctr_set_disable(u64 *state, u64 ctrsets)
  34 {
  35         *state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
  36 }
  37
  38 static inline void ctr_set_start(u64 *state, u64 ctrsets)
  39 {
  40         *state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
  41 }
  42
  43 static inline void ctr_set_stop(u64 *state, u64 ctrsets)
  44 {
  45         *state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
  46 }
  47
  48 static 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
  67 struct 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 };
  81 DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
  82
  83 bool kernel_cpumcf_avail(void);
  84 int __kernel_cpumcf_begin(void);
  85 unsigned long kernel_cpumcf_alert(int clear);
  86 void __kernel_cpumcf_end(void);
  87
  88 static 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 }
  96 static 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 */
 103 static inline int stccm_avail(void)
 104 {
 105         return test_facility(142);
 106 }
 107
 108 size_t cpum_cf_ctrset_size(enum cpumf_ctr_set ctrset,
 109                            struct cpumf_ctr_info *info);
 110 int cfset_online_cpu(unsigned int cpu);
 111 int cfset_offline_cpu(unsigned int cpu);
 112 #endif /* _ASM_S390_CPU_MCF_H */