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, int ctr_set)
  36 {
  37         *state |= cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ENABLE_SHIFT;
  38 }
  39 static inline void ctr_set_disable(u64 *state, int ctr_set)
  40 {
  41         *state &= ~(cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ENABLE_SHIFT);
  42 }
  43 static inline void ctr_set_start(u64 *state, int ctr_set)
  44 {
  45         *state |= cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ACTCTL_SHIFT;
  46 }
  47 static inline void ctr_set_stop(u64 *state, int ctr_set)
  48 {
  49         *state &= ~(cpumf_ctr_ctl[ctr_set] << CPUMF_LCCTL_ACTCTL_SHIFT);
  50 }
  51
  52 static inline void ctr_set_multiple_enable(u64 *state, u64 ctrsets)
  53 {
  54         *state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
  55 }
  56
  57 static inline void ctr_set_multiple_disable(u64 *state, u64 ctrsets)
  58 {
  59         *state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
  60 }
  61
  62 static inline void ctr_set_multiple_start(u64 *state, u64 ctrsets)
  63 {
  64         *state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
  65 }
  66
  67 static inline void ctr_set_multiple_stop(u64 *state, u64 ctrsets)
  68 {
  69         *state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
  70 }
  71
  72 static inline int ctr_stcctm(enum cpumf_ctr_set set, u64 range, u64 *dest)
  73 {
  74         switch (set) {
  75         case CPUMF_CTR_SET_BASIC:
  76                 return stcctm(BASIC, range, dest);
  77         case CPUMF_CTR_SET_USER:
  78                 return stcctm(PROBLEM_STATE, range, dest);
  79         case CPUMF_CTR_SET_CRYPTO:
  80                 return stcctm(CRYPTO_ACTIVITY, range, dest);
  81         case CPUMF_CTR_SET_EXT:
  82                 return stcctm(EXTENDED, range, dest);
  83         case CPUMF_CTR_SET_MT_DIAG:
  84                 return stcctm(MT_DIAG_CLEARING, range, dest);
  85         case CPUMF_CTR_SET_MAX:
  86                 return 3;
  87         }
  88         return 3;
  89 }
  90
  91 struct cpu_cf_events {
  92         struct cpumf_ctr_info   info;
  93         atomic_t                ctr_set[CPUMF_CTR_SET_MAX];
  94         atomic64_t              alert;
  95         u64                     state;
  96         unsigned int            flags;
  97 };
  98 DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
  99
 100 bool kernel_cpumcf_avail(void);
 101 int __kernel_cpumcf_begin(void);
 102 unsigned long kernel_cpumcf_alert(int clear);
 103 void __kernel_cpumcf_end(void);
 104
 105 static inline int kernel_cpumcf_begin(void)
 106 {
 107         if (!cpum_cf_avail())
 108                 return -ENODEV;
 109
 110         preempt_disable();
 111         return __kernel_cpumcf_begin();
 112 }
 113 static inline void kernel_cpumcf_end(void)
 114 {
 115         __kernel_cpumcf_end();
 116         preempt_enable();
 117 }
 118
 119 /* Return true if store counter set multiple instruction is available */
 120 static inline int stccm_avail(void)
 121 {
 122         return test_facility(142);
 123 }
 124
 125 size_t cpum_cf_ctrset_size(enum cpumf_ctr_set ctrset,
 126                            struct cpumf_ctr_info *info);
 127 #endif /* _ASM_S390_CPU_MCF_H */