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

#include "util/kvm-stat.h"
#include "util/parse-events.h"

#include "book3s_hv_exits.h"

#define NR_TPS 2

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);

/* Tracepoints specific to ppc_book3s_hv */
const char *ppc_book3s_hv_kvm_tp[] = {
	"kvm_hv:kvm_guest_enter",
	"kvm_hv:kvm_guest_exit",
};

/* 1 extra placeholder for NULL */
const char *kvm_events_tp[NR_TPS + 1];
const char *kvm_exit_reason;

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 },
	{ 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;
}