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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include "util/kvm-stat.h"
#include "util/parse-events.h"
#include "util/debug.h"
#include "util/evsel.h"
#include "util/evlist.h"
#include "util/pmu.h"
#include "book3s_hv_exits.h"
#include "book3s_hcalls.h"
#include <subcmd/parse-options.h>
#define NR_TPS 4
const char *vcpu_id_str = "vcpu_id";
const int decode_str_len = 40;
const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter";
const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit";
define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit);
define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall);
/* Tracepoints specific to ppc_book3s_hv */
const char *ppc_book3s_hv_kvm_tp[] = {
"kvm_hv:kvm_guest_enter",
"kvm_hv:kvm_guest_exit",
"kvm_hv:kvm_hcall_enter",
"kvm_hv:kvm_hcall_exit",
NULL,
};
/* 1 extra placeholder for NULL */
const char *kvm_events_tp[NR_TPS + 1];
const char *kvm_exit_reason;
static void hcall_event_get_key(struct evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
key->info = 0;
key->key = perf_evsel__intval(evsel, sample, "req");
}
static const char *get_hcall_exit_reason(u64 exit_code)
{
struct exit_reasons_table *tbl = hcall_reasons;
while (tbl->reason != NULL) {
if (tbl->exit_code == exit_code)
return tbl->reason;
tbl++;
}
pr_debug("Unknown hcall code: %lld\n",
(unsigned long long)exit_code);
return "UNKNOWN";
}
static bool hcall_event_end(struct evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
return (!strcmp(evsel->name, kvm_events_tp[3]));
}
static bool hcall_event_begin(struct evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
if (!strcmp(evsel->name, kvm_events_tp[2])) {
hcall_event_get_key(evsel, sample, key);
return true;
}
return false;
}
static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
struct event_key *key,
char *decode)
{
const char *hcall_reason = get_hcall_exit_reason(key->key);
scnprintf(decode, decode_str_len, "%s", hcall_reason);
}
static struct kvm_events_ops hcall_events = {
.is_begin_event = hcall_event_begin,
.is_end_event = hcall_event_end,
.decode_key = hcall_event_decode_key,
.name = "HCALL-EVENT",
};
static struct kvm_events_ops exit_events = {
.is_begin_event = exit_event_begin,
.is_end_event = exit_event_end,
.decode_key = exit_event_decode_key,
.name = "VM-EXIT"
};
struct kvm_reg_events_ops kvm_reg_events_ops[] = {
{ .name = "vmexit", .ops = &exit_events },
{ .name = "hcall", .ops = &hcall_events },
{ NULL, NULL },
};
const char * const kvm_skip_events[] = {
NULL,
};
static int is_tracepoint_available(const char *str, struct evlist *evlist)
{
struct parse_events_error err;
int ret;
bzero(&err, sizeof(err));
ret = parse_events(evlist, str, &err);
if (err.str)
parse_events_print_error(&err, "tracepoint");
return ret;
}
static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm,
struct evlist *evlist)
{
const char **events_ptr;
int i, nr_tp = 0, err = -1;
/* Check for book3s_hv tracepoints */
for (events_ptr = ppc_book3s_hv_kvm_tp; *events_ptr; events_ptr++) {
err = is_tracepoint_available(*events_ptr, evlist);
if (err)
return -1;
nr_tp++;
}
for (i = 0; i < nr_tp; i++)
kvm_events_tp[i] = ppc_book3s_hv_kvm_tp[i];
kvm_events_tp[i] = NULL;
kvm_exit_reason = "trap";
kvm->exit_reasons = hv_exit_reasons;
kvm->exit_reasons_isa = "HV";
return 0;
}
/* Wrapper to setup kvm tracepoints */
static int ppc__setup_kvm_tp(struct perf_kvm_stat *kvm)
{
struct evlist *evlist = evlist__new();
if (evlist == NULL)
return -ENOMEM;
/* Right now, only supported on book3s_hv */
return ppc__setup_book3s_hv(kvm, evlist);
}
int setup_kvm_events_tp(struct perf_kvm_stat *kvm)
{
return ppc__setup_kvm_tp(kvm);
}
int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
{
int ret;
ret = ppc__setup_kvm_tp(kvm);
if (ret) {
kvm->exit_reasons = NULL;
kvm->exit_reasons_isa = NULL;
}
return ret;
}
/*
* Incase of powerpc architecture, pmu registers are programmable
* by guest kernel. So monitoring guest via host may not provide
* valid samples with default 'cycles' event. It is better to use
* 'trace_imc/trace_cycles' event for guest profiling, since it
* can track the guest instruction pointer in the trace-record.
*
* Function to parse the arguments and return appropriate values.
*/
int kvm_add_default_arch_event(int *argc, const char **argv)
{
const char **tmp;
bool event = false;
int i, j = *argc;
const struct option event_options[] = {
OPT_BOOLEAN('e', "event", &event, NULL),
OPT_END()
};
tmp = calloc(j + 1, sizeof(char *));
if (!tmp)
return -EINVAL;
for (i = 0; i < j; i++)
tmp[i] = argv[i];
parse_options(j, tmp, event_options, NULL, PARSE_OPT_KEEP_UNKNOWN);
if (!event) {
if (pmu_have_event("trace_imc", "trace_cycles")) {
argv[j++] = strdup("-e");
argv[j++] = strdup("trace_imc/trace_cycles/");
*argc += 2;
} else {
free(tmp);
return -EINVAL;
}
}
free(tmp);
return 0;
}
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