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 static const u64 cpumf_ctr_ctl[CPUMF_CTR_SET_MAX] = {
  28         [CPUMF_CTR_SET_BASIC]   = 0x02,
  29         [CPUMF_CTR_SET_USER]    = 0x04,
  30         [CPUMF_CTR_SET_CRYPTO]  = 0x08,
  31         [CPUMF_CTR_SET_EXT]     = 0x01,
  32         [CPUMF_CTR_SET_MT_DIAG] = 0x20,
  33 };
  34
  35 static inline void ctr_set_enable(u64 *state, u64 ctrsets)
  36 {
  37         *state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
  38 }
  39
  40 static inline void ctr_set_disable(u64 *state, u64 ctrsets)
  41 {
  42         *state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
  43 }
  44
  45 static inline void ctr_set_start(u64 *state, u64 ctrsets)
  46 {
  47         *state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
  48 }
  49
  50 static inline void ctr_set_stop(u64 *state, u64 ctrsets)
  51 {
  52         *state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
  53 }
  54
  55 static inline int ctr_stcctm(enum cpumf_ctr_set set, u64 range, u64 *dest)
  56 {
  57         switch (set) {
  58         case CPUMF_CTR_SET_BASIC:
  59                 return stcctm(BASIC, range, dest);
  60         case CPUMF_CTR_SET_USER:
  61                 return stcctm(PROBLEM_STATE, range, dest);
  62         case CPUMF_CTR_SET_CRYPTO:
  63                 return stcctm(CRYPTO_ACTIVITY, range, dest);
  64         case CPUMF_CTR_SET_EXT:
  65                 return stcctm(EXTENDED, range, dest);
  66         case CPUMF_CTR_SET_MT_DIAG:
  67                 return stcctm(MT_DIAG_CLEARING, range, dest);
  68         case CPUMF_CTR_SET_MAX:
  69                 return 3;
  70         }
  71         return 3;
  72 }
  73
  74 struct cpu_cf_events {
  75         struct cpumf_ctr_info   info;
  76         atomic_t                ctr_set[CPUMF_CTR_SET_MAX];
  77         atomic64_t              alert;
  78         u64                     state;          /* For perf_event_open SVC */
  79         u64                     dev_state;      /* For /dev/hwctr */
  80         unsigned int            flags;
  81         size_t used;                    /* Bytes used in data */
  82         size_t usedss;                  /* Bytes used in start/stop */
  83         unsigned char start[PAGE_SIZE]; /* Counter set at event add */
  84         unsigned char stop[PAGE_SIZE];  /* Counter set at event delete */
  85         unsigned char data[PAGE_SIZE];  /* Counter set at /dev/hwctr */
  86         unsigned int sets;              /* # Counter set saved in memory */
  87 };
  88 DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
  89
  90 bool kernel_cpumcf_avail(void);
  91 int __kernel_cpumcf_begin(void);
  92 unsigned long kernel_cpumcf_alert(int clear);
  93 void __kernel_cpumcf_end(void);
  94
  95 static inline int kernel_cpumcf_begin(void)
  96 {
  97         if (!cpum_cf_avail())
  98                 return -ENODEV;
  99
 100         preempt_disable();
 101         return __kernel_cpumcf_begin();
 102 }
 103 static inline void kernel_cpumcf_end(void)
 104 {
 105         __kernel_cpumcf_end();
 106         preempt_enable();
 107 }
 108
 109 /* Return true if store counter set multiple instruction is available */
 110 static inline int stccm_avail(void)
 111 {
 112         return test_facility(142);
 113 }
 114
 115 size_t cpum_cf_ctrset_size(enum cpumf_ctr_set ctrset,
 116                            struct cpumf_ctr_info *info);
 117 int cfset_online_cpu(unsigned int cpu);
 118 int cfset_offline_cpu(unsigned int cpu);
 119 #endif /* _ASM_S390_CPU_MCF_H */