1 #include "util/kvm-stat.h" 2 #include "util/parse-events.h" 3 #include "util/debug.h" 4 5 #include "book3s_hv_exits.h" 6 #include "book3s_hcalls.h" 7 8 #define NR_TPS 4 9 10 const char *vcpu_id_str = "vcpu_id"; 11 const int decode_str_len = 40; 12 const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter"; 13 const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit"; 14 15 define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit); 16 define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall); 17 18 /* Tracepoints specific to ppc_book3s_hv */ 19 const char *ppc_book3s_hv_kvm_tp[] = { 20 "kvm_hv:kvm_guest_enter", 21 "kvm_hv:kvm_guest_exit", 22 "kvm_hv:kvm_hcall_enter", 23 "kvm_hv:kvm_hcall_exit", 24 NULL, 25 }; 26 27 /* 1 extra placeholder for NULL */ 28 const char *kvm_events_tp[NR_TPS + 1]; 29 const char *kvm_exit_reason; 30 31 static void hcall_event_get_key(struct perf_evsel *evsel, 32 struct perf_sample *sample, 33 struct event_key *key) 34 { 35 key->info = 0; 36 key->key = perf_evsel__intval(evsel, sample, "req"); 37 } 38 39 static const char *get_hcall_exit_reason(u64 exit_code) 40 { 41 struct exit_reasons_table *tbl = hcall_reasons; 42 43 while (tbl->reason != NULL) { 44 if (tbl->exit_code == exit_code) 45 return tbl->reason; 46 tbl++; 47 } 48 49 pr_debug("Unknown hcall code: %lld\n", 50 (unsigned long long)exit_code); 51 return "UNKNOWN"; 52 } 53 54 static bool hcall_event_end(struct perf_evsel *evsel, 55 struct perf_sample *sample __maybe_unused, 56 struct event_key *key __maybe_unused) 57 { 58 return (!strcmp(evsel->name, kvm_events_tp[3])); 59 } 60 61 static bool hcall_event_begin(struct perf_evsel *evsel, 62 struct perf_sample *sample, struct event_key *key) 63 { 64 if (!strcmp(evsel->name, kvm_events_tp[2])) { 65 hcall_event_get_key(evsel, sample, key); 66 return true; 67 } 68 69 return false; 70 } 71 static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused, 72 struct event_key *key, 73 char *decode) 74 { 75 const char *hcall_reason = get_hcall_exit_reason(key->key); 76 77 scnprintf(decode, decode_str_len, "%s", hcall_reason); 78 } 79 80 static struct kvm_events_ops hcall_events = { 81 .is_begin_event = hcall_event_begin, 82 .is_end_event = hcall_event_end, 83 .decode_key = hcall_event_decode_key, 84 .name = "HCALL-EVENT", 85 }; 86 87 static struct kvm_events_ops exit_events = { 88 .is_begin_event = exit_event_begin, 89 .is_end_event = exit_event_end, 90 .decode_key = exit_event_decode_key, 91 .name = "VM-EXIT" 92 }; 93 94 struct kvm_reg_events_ops kvm_reg_events_ops[] = { 95 { .name = "vmexit", .ops = &exit_events }, 96 { .name = "hcall", .ops = &hcall_events }, 97 { NULL, NULL }, 98 }; 99 100 const char * const kvm_skip_events[] = { 101 NULL, 102 }; 103 104 105 static int is_tracepoint_available(const char *str, struct perf_evlist *evlist) 106 { 107 struct parse_events_error err; 108 int ret; 109 110 err.str = NULL; 111 ret = parse_events(evlist, str, &err); 112 if (err.str) 113 pr_err("%s : %s\n", str, err.str); 114 return ret; 115 } 116 117 static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm, 118 struct perf_evlist *evlist) 119 { 120 const char **events_ptr; 121 int i, nr_tp = 0, err = -1; 122 123 /* Check for book3s_hv tracepoints */ 124 for (events_ptr = ppc_book3s_hv_kvm_tp; *events_ptr; events_ptr++) { 125 err = is_tracepoint_available(*events_ptr, evlist); 126 if (err) 127 return -1; 128 nr_tp++; 129 } 130 131 for (i = 0; i < nr_tp; i++) 132 kvm_events_tp[i] = ppc_book3s_hv_kvm_tp[i]; 133 134 kvm_events_tp[i] = NULL; 135 kvm_exit_reason = "trap"; 136 kvm->exit_reasons = hv_exit_reasons; 137 kvm->exit_reasons_isa = "HV"; 138 139 return 0; 140 } 141 142 /* Wrapper to setup kvm tracepoints */ 143 static int ppc__setup_kvm_tp(struct perf_kvm_stat *kvm) 144 { 145 struct perf_evlist *evlist = perf_evlist__new(); 146 147 if (evlist == NULL) 148 return -ENOMEM; 149 150 /* Right now, only supported on book3s_hv */ 151 return ppc__setup_book3s_hv(kvm, evlist); 152 } 153 154 int setup_kvm_events_tp(struct perf_kvm_stat *kvm) 155 { 156 return ppc__setup_kvm_tp(kvm); 157 } 158 159 int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused) 160 { 161 int ret; 162 163 ret = ppc__setup_kvm_tp(kvm); 164 if (ret) { 165 kvm->exit_reasons = NULL; 166 kvm->exit_reasons_isa = NULL; 167 } 168 169 return ret; 170 } 171