1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include "util/kvm-stat.h" 4 #include "util/parse-events.h" 5 #include "util/debug.h" 6 #include "util/evsel.h" 7 #include "util/evlist.h" 8 #include "util/pmu.h" 9 10 #include "book3s_hv_exits.h" 11 #include "book3s_hcalls.h" 12 #include <subcmd/parse-options.h> 13 14 #define NR_TPS 4 15 16 const char *vcpu_id_str = "vcpu_id"; 17 const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter"; 18 const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit"; 19 20 define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit); 21 define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall); 22 23 /* Tracepoints specific to ppc_book3s_hv */ 24 const char *ppc_book3s_hv_kvm_tp[] = { 25 "kvm_hv:kvm_guest_enter", 26 "kvm_hv:kvm_guest_exit", 27 "kvm_hv:kvm_hcall_enter", 28 "kvm_hv:kvm_hcall_exit", 29 NULL, 30 }; 31 32 /* 1 extra placeholder for NULL */ 33 const char *kvm_events_tp[NR_TPS + 1]; 34 const char *kvm_exit_reason; 35 36 static void hcall_event_get_key(struct evsel *evsel, 37 struct perf_sample *sample, 38 struct event_key *key) 39 { 40 key->info = 0; 41 key->key = evsel__intval(evsel, sample, "req"); 42 } 43 44 static const char *get_hcall_exit_reason(u64 exit_code) 45 { 46 struct exit_reasons_table *tbl = hcall_reasons; 47 48 while (tbl->reason != NULL) { 49 if (tbl->exit_code == exit_code) 50 return tbl->reason; 51 tbl++; 52 } 53 54 pr_debug("Unknown hcall code: %lld\n", 55 (unsigned long long)exit_code); 56 return "UNKNOWN"; 57 } 58 59 static bool hcall_event_end(struct evsel *evsel, 60 struct perf_sample *sample __maybe_unused, 61 struct event_key *key __maybe_unused) 62 { 63 return (evsel__name_is(evsel, kvm_events_tp[3])); 64 } 65 66 static bool hcall_event_begin(struct evsel *evsel, 67 struct perf_sample *sample, struct event_key *key) 68 { 69 if (evsel__name_is(evsel, kvm_events_tp[2])) { 70 hcall_event_get_key(evsel, sample, key); 71 return true; 72 } 73 74 return false; 75 } 76 static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused, 77 struct event_key *key, 78 char *decode) 79 { 80 const char *hcall_reason = get_hcall_exit_reason(key->key); 81 82 scnprintf(decode, KVM_EVENT_NAME_LEN, "%s", hcall_reason); 83 } 84 85 static struct kvm_events_ops hcall_events = { 86 .is_begin_event = hcall_event_begin, 87 .is_end_event = hcall_event_end, 88 .decode_key = hcall_event_decode_key, 89 .name = "HCALL-EVENT", 90 }; 91 92 static struct kvm_events_ops exit_events = { 93 .is_begin_event = exit_event_begin, 94 .is_end_event = exit_event_end, 95 .decode_key = exit_event_decode_key, 96 .name = "VM-EXIT" 97 }; 98 99 struct kvm_reg_events_ops kvm_reg_events_ops[] = { 100 { .name = "vmexit", .ops = &exit_events }, 101 { .name = "hcall", .ops = &hcall_events }, 102 { NULL, NULL }, 103 }; 104 105 const char * const kvm_skip_events[] = { 106 NULL, 107 }; 108 109 110 static int is_tracepoint_available(const char *str, struct evlist *evlist) 111 { 112 struct parse_events_error err; 113 int ret; 114 115 parse_events_error__init(&err); 116 ret = parse_events(evlist, str, &err); 117 if (err.str) 118 parse_events_error__print(&err, "tracepoint"); 119 parse_events_error__exit(&err); 120 return ret; 121 } 122 123 static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm, 124 struct evlist *evlist) 125 { 126 const char **events_ptr; 127 int i, nr_tp = 0, err = -1; 128 129 /* Check for book3s_hv tracepoints */ 130 for (events_ptr = ppc_book3s_hv_kvm_tp; *events_ptr; events_ptr++) { 131 err = is_tracepoint_available(*events_ptr, evlist); 132 if (err) 133 return -1; 134 nr_tp++; 135 } 136 137 for (i = 0; i < nr_tp; i++) 138 kvm_events_tp[i] = ppc_book3s_hv_kvm_tp[i]; 139 140 kvm_events_tp[i] = NULL; 141 kvm_exit_reason = "trap"; 142 kvm->exit_reasons = hv_exit_reasons; 143 kvm->exit_reasons_isa = "HV"; 144 145 return 0; 146 } 147 148 /* Wrapper to setup kvm tracepoints */ 149 static int ppc__setup_kvm_tp(struct perf_kvm_stat *kvm) 150 { 151 struct evlist *evlist = evlist__new(); 152 153 if (evlist == NULL) 154 return -ENOMEM; 155 156 /* Right now, only supported on book3s_hv */ 157 return ppc__setup_book3s_hv(kvm, evlist); 158 } 159 160 int setup_kvm_events_tp(struct perf_kvm_stat *kvm) 161 { 162 return ppc__setup_kvm_tp(kvm); 163 } 164 165 int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused) 166 { 167 int ret; 168 169 ret = ppc__setup_kvm_tp(kvm); 170 if (ret) { 171 kvm->exit_reasons = NULL; 172 kvm->exit_reasons_isa = NULL; 173 } 174 175 return ret; 176 } 177 178 /* 179 * In case of powerpc architecture, pmu registers are programmable 180 * by guest kernel. So monitoring guest via host may not provide 181 * valid samples with default 'cycles' event. It is better to use 182 * 'trace_imc/trace_cycles' event for guest profiling, since it 183 * can track the guest instruction pointer in the trace-record. 184 * 185 * Function to parse the arguments and return appropriate values. 186 */ 187 int kvm_add_default_arch_event(int *argc, const char **argv) 188 { 189 const char **tmp; 190 bool event = false; 191 int i, j = *argc; 192 193 const struct option event_options[] = { 194 OPT_BOOLEAN('e', "event", &event, NULL), 195 OPT_END() 196 }; 197 198 tmp = calloc(j + 1, sizeof(char *)); 199 if (!tmp) 200 return -EINVAL; 201 202 for (i = 0; i < j; i++) 203 tmp[i] = argv[i]; 204 205 parse_options(j, tmp, event_options, NULL, PARSE_OPT_KEEP_UNKNOWN); 206 if (!event) { 207 if (pmu_have_event("trace_imc", "trace_cycles")) { 208 argv[j++] = strdup("-e"); 209 argv[j++] = strdup("trace_imc/trace_cycles/"); 210 *argc += 2; 211 } else { 212 free(tmp); 213 return -EINVAL; 214 } 215 } 216 217 free(tmp); 218 return 0; 219 } 220