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
ctr_set_enable(u64 * state,u64 ctrsets)28 static inline void ctr_set_enable(u64 *state, u64 ctrsets)
29 {
30 *state |= ctrsets << CPUMF_LCCTL_ENABLE_SHIFT;
31 }
32
ctr_set_disable(u64 * state,u64 ctrsets)33 static inline void ctr_set_disable(u64 *state, u64 ctrsets)
34 {
35 *state &= ~(ctrsets << CPUMF_LCCTL_ENABLE_SHIFT);
36 }
37
ctr_set_start(u64 * state,u64 ctrsets)38 static inline void ctr_set_start(u64 *state, u64 ctrsets)
39 {
40 *state |= ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT;
41 }
42
ctr_set_stop(u64 * state,u64 ctrsets)43 static inline void ctr_set_stop(u64 *state, u64 ctrsets)
44 {
45 *state &= ~(ctrsets << CPUMF_LCCTL_ACTCTL_SHIFT);
46 }
47
ctr_stcctm(enum cpumf_ctr_set set,u64 range,u64 * dest)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
kernel_cpumcf_begin(void)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 }
kernel_cpumcf_end(void)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 */
stccm_avail(void)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 */
113