tools/perf/arch/arm64/util/kvm-stat.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include <memory.h>
   4 #include "../../../util/evsel.h"
   5 #include "../../../util/kvm-stat.h"
   6 #include "arm64_exception_types.h"
   7 #include "debug.h"
   8
   9 define_exit_reasons_table(arm64_exit_reasons, kvm_arm_exception_type);
  10 define_exit_reasons_table(arm64_trap_exit_reasons, kvm_arm_exception_class);
  11
  12 const char *kvm_trap_exit_reason = "esr_ec";
  13 const char *vcpu_id_str = "id";
  14 const int decode_str_len = 20;
  15 const char *kvm_exit_reason = "ret";
  16 const char *kvm_entry_trace = "kvm:kvm_entry";
  17 const char *kvm_exit_trace = "kvm:kvm_exit";
  18
  19 const char *kvm_events_tp[] = {
  20         "kvm:kvm_entry",
  21         "kvm:kvm_exit",
  22         NULL,
  23 };
  24
  25 static void event_get_key(struct evsel *evsel,
  26                           struct perf_sample *sample,
  27                           struct event_key *key)
  28 {
  29         key->info = 0;
  30         key->key = evsel__intval(evsel, sample, kvm_exit_reason);
  31         key->exit_reasons = arm64_exit_reasons;
  32
  33         /*
  34          * TRAP exceptions carry exception class info in esr_ec field
  35          * and, hence, we need to use a different exit_reasons table to
  36          * properly decode event's est_ec.
  37          */
  38         if (key->key == ARM_EXCEPTION_TRAP) {
  39                 key->key = evsel__intval(evsel, sample, kvm_trap_exit_reason);
  40                 key->exit_reasons = arm64_trap_exit_reasons;
  41         }
  42 }
  43
  44 static bool event_begin(struct evsel *evsel,
  45                         struct perf_sample *sample __maybe_unused,
  46                         struct event_key *key __maybe_unused)
  47 {
  48         return !strcmp(evsel->name, kvm_entry_trace);
  49 }
  50
  51 static bool event_end(struct evsel *evsel,
  52                       struct perf_sample *sample,
  53                       struct event_key *key)
  54 {
  55         if (!strcmp(evsel->name, kvm_exit_trace)) {
  56                 event_get_key(evsel, sample, key);
  57                 return true;
  58         }
  59         return false;
  60 }
  61
  62 static struct kvm_events_ops exit_events = {
  63         .is_begin_event = event_begin,
  64         .is_end_event   = event_end,
  65         .decode_key     = exit_event_decode_key,
  66         .name           = "VM-EXIT"
  67 };
  68
  69 struct kvm_reg_events_ops kvm_reg_events_ops[] = {
  70         {
  71                 .name   = "vmexit",
  72                 .ops    = &exit_events,
  73         },
  74         { NULL },
  75 };
  76
  77 const char * const kvm_skip_events[] = {
  78         NULL,
  79 };
  80
  81 int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
  82 {
  83         kvm->exit_reasons_isa = "arm64";
  84         return 0;
  85 }