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