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

   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 }