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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 "book3s_hv_exits.h"
#include "book3s_hcalls.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 perf_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 perf_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 perf_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 perf_evlist *evlist)
{
struct parse_events_error err;
int ret;
err.str = NULL;
ret = parse_events(evlist, str, &err);
if (err.str)
pr_err("%s : %s\n", str, err.str);
return ret;
}
static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm,
struct perf_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 perf_evlist *evlist = perf_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;
}
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