tools/perf/arch/powerpc/util/kvm-stat.c

   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
   9 #include "book3s_hv_exits.h"
  10 #include "book3s_hcalls.h"
  11
  12 #define NR_TPS 4
  13
  14 const char *vcpu_id_str = "vcpu_id";
  15 const int decode_str_len = 40;
  16 const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter";
  17 const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit";
  18
  19 define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit);
  20 define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall);
  21
  22 /* Tracepoints specific to ppc_book3s_hv */
  23 const char *ppc_book3s_hv_kvm_tp[] = {
  24         "kvm_hv:kvm_guest_enter",
  25         "kvm_hv:kvm_guest_exit",
  26         "kvm_hv:kvm_hcall_enter",
  27         "kvm_hv:kvm_hcall_exit",
  28         NULL,
  29 };
  30
  31 /* 1 extra placeholder for NULL */
  32 const char *kvm_events_tp[NR_TPS + 1];
  33 const char *kvm_exit_reason;
  34
  35 static void hcall_event_get_key(struct evsel *evsel,
  36                                 struct perf_sample *sample,
  37                                 struct event_key *key)
  38 {
  39         key->info = 0;
  40         key->key = perf_evsel__intval(evsel, sample, "req");
  41 }
  42
  43 static const char *get_hcall_exit_reason(u64 exit_code)
  44 {
  45         struct exit_reasons_table *tbl = hcall_reasons;
  46
  47         while (tbl->reason != NULL) {
  48                 if (tbl->exit_code == exit_code)
  49                         return tbl->reason;
  50                 tbl++;
  51         }
  52
  53         pr_debug("Unknown hcall code: %lld\n",
  54                (unsigned long long)exit_code);
  55         return "UNKNOWN";
  56 }
  57
  58 static bool hcall_event_end(struct evsel *evsel,
  59                             struct perf_sample *sample __maybe_unused,
  60                             struct event_key *key __maybe_unused)
  61 {
  62         return (!strcmp(evsel->name, kvm_events_tp[3]));
  63 }
  64
  65 static bool hcall_event_begin(struct evsel *evsel,
  66                               struct perf_sample *sample, struct event_key *key)
  67 {
  68         if (!strcmp(evsel->name, kvm_events_tp[2])) {
  69                 hcall_event_get_key(evsel, sample, key);
  70                 return true;
  71         }
  72
  73         return false;
  74 }
  75 static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
  76                                    struct event_key *key,
  77                                    char *decode)
  78 {
  79         const char *hcall_reason = get_hcall_exit_reason(key->key);
  80
  81         scnprintf(decode, decode_str_len, "%s", hcall_reason);
  82 }
  83
  84 static struct kvm_events_ops hcall_events = {
  85         .is_begin_event = hcall_event_begin,
  86         .is_end_event = hcall_event_end,
  87         .decode_key = hcall_event_decode_key,
  88         .name = "HCALL-EVENT",
  89 };
  90
  91 static struct kvm_events_ops exit_events = {
  92         .is_begin_event = exit_event_begin,
  93         .is_end_event = exit_event_end,
  94         .decode_key = exit_event_decode_key,
  95         .name = "VM-EXIT"
  96 };
  97
  98 struct kvm_reg_events_ops kvm_reg_events_ops[] = {
  99         { .name = "vmexit", .ops = &exit_events },
 100         { .name = "hcall", .ops = &hcall_events },
 101         { NULL, NULL },
 102 };
 103
 104 const char * const kvm_skip_events[] = {
 105         NULL,
 106 };
 107
 108
 109 static int is_tracepoint_available(const char *str, struct evlist *evlist)
 110 {
 111         struct parse_events_error err;
 112         int ret;
 113
 114         err.str = NULL;
 115         ret = parse_events(evlist, str, &err);
 116         if (err.str)
 117                 pr_err("%s : %s\n", str, err.str);
 118         return ret;
 119 }
 120
 121 static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm,
 122                                 struct evlist *evlist)
 123 {
 124         const char **events_ptr;
 125         int i, nr_tp = 0, err = -1;
 126
 127         /* Check for book3s_hv tracepoints */
 128         for (events_ptr = ppc_book3s_hv_kvm_tp; *events_ptr; events_ptr++) {
 129                 err = is_tracepoint_available(*events_ptr, evlist);
 130                 if (err)
 131                         return -1;
 132                 nr_tp++;
 133         }
 134
 135         for (i = 0; i < nr_tp; i++)
 136                 kvm_events_tp[i] = ppc_book3s_hv_kvm_tp[i];
 137
 138         kvm_events_tp[i] = NULL;
 139         kvm_exit_reason = "trap";
 140         kvm->exit_reasons = hv_exit_reasons;
 141         kvm->exit_reasons_isa = "HV";
 142
 143         return 0;
 144 }
 145
 146 /* Wrapper to setup kvm tracepoints */
 147 static int ppc__setup_kvm_tp(struct perf_kvm_stat *kvm)
 148 {
 149         struct evlist *evlist = evlist__new();
 150
 151         if (evlist == NULL)
 152                 return -ENOMEM;
 153
 154         /* Right now, only supported on book3s_hv */
 155         return ppc__setup_book3s_hv(kvm, evlist);
 156 }
 157
 158 int setup_kvm_events_tp(struct perf_kvm_stat *kvm)
 159 {
 160         return ppc__setup_kvm_tp(kvm);
 161 }
 162
 163 int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
 164 {
 165         int ret;
 166
 167         ret = ppc__setup_kvm_tp(kvm);
 168         if (ret) {
 169                 kvm->exit_reasons = NULL;
 170                 kvm->exit_reasons_isa = NULL;
 171         }
 172
 173         return ret;
 174 }