kvm-stat.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <errno.h>
  3#include <memory.h>
  4#include "util/kvm-stat.h"
  5#include "util/parse-events.h"
  6#include "util/debug.h"
  7#include "util/evsel.h"
  8#include "util/evlist.h"
  9#include "util/pmus.h"
 10
 11#define LOONGARCH_EXCEPTION_INT		0
 12#define LOONGARCH_EXCEPTION_PIL		1
 13#define LOONGARCH_EXCEPTION_PIS		2
 14#define LOONGARCH_EXCEPTION_PIF		3
 15#define LOONGARCH_EXCEPTION_PME		4
 16#define LOONGARCH_EXCEPTION_FPD		15
 17#define LOONGARCH_EXCEPTION_SXD		16
 18#define LOONGARCH_EXCEPTION_ASXD	17
 19#define LOONGARCH_EXCEPTION_GSPR	22
 20#define  LOONGARCH_EXCEPTION_CPUCFG	100
 21#define  LOONGARCH_EXCEPTION_CSR	101
 22#define  LOONGARCH_EXCEPTION_IOCSR	102
 23#define  LOONGARCH_EXCEPTION_IDLE	103
 24#define  LOONGARCH_EXCEPTION_OTHERS	104
 25#define LOONGARCH_EXCEPTION_HVC		23
 26
 27#define loongarch_exception_type				\
 28	{LOONGARCH_EXCEPTION_INT,  "Interrupt" },		\
 29	{LOONGARCH_EXCEPTION_PIL,  "Mem Read" },		\
 30	{LOONGARCH_EXCEPTION_PIS,  "Mem Store" },		\
 31	{LOONGARCH_EXCEPTION_PIF,  "Inst Fetch" },		\
 32	{LOONGARCH_EXCEPTION_PME,  "Mem Modify" },		\
 33	{LOONGARCH_EXCEPTION_FPD,  "FPU" },			\
 34	{LOONGARCH_EXCEPTION_SXD,  "LSX" },			\
 35	{LOONGARCH_EXCEPTION_ASXD, "LASX" },			\
 36	{LOONGARCH_EXCEPTION_GSPR, "Privilege Error" },		\
 37	{LOONGARCH_EXCEPTION_HVC,  "Hypercall" },		\
 38	{LOONGARCH_EXCEPTION_CPUCFG, "CPUCFG" },		\
 39	{LOONGARCH_EXCEPTION_CSR,    "CSR" },			\
 40	{LOONGARCH_EXCEPTION_IOCSR,  "IOCSR" },			\
 41	{LOONGARCH_EXCEPTION_IDLE,   "Idle" },			\
 42	{LOONGARCH_EXCEPTION_OTHERS, "Others" }
 43
 44define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type);
 45
 46const char *vcpu_id_str = "vcpu_id";
 47const char *kvm_exit_reason = "reason";
 48const char *kvm_entry_trace = "kvm:kvm_enter";
 49const char *kvm_reenter_trace = "kvm:kvm_reenter";
 50const char *kvm_exit_trace = "kvm:kvm_exit";
 51const char *kvm_events_tp[] = {
 52	"kvm:kvm_enter",
 53	"kvm:kvm_reenter",
 54	"kvm:kvm_exit",
 55	"kvm:kvm_exit_gspr",
 56	NULL,
 57};
 58
 59static bool event_begin(struct evsel *evsel,
 60			struct perf_sample *sample, struct event_key *key)
 61{
 62	return exit_event_begin(evsel, sample, key);
 63}
 64
 65static bool event_end(struct evsel *evsel,
 66		      struct perf_sample *sample __maybe_unused,
 67		      struct event_key *key __maybe_unused)
 68{
 69	/*
 70	 * LoongArch kvm is different with other architectures
 71	 *
 72	 * There is kvm:kvm_reenter or kvm:kvm_enter event adjacent with
 73	 * kvm:kvm_exit event.
 74	 *   kvm:kvm_enter   means returning to vmm and then to guest
 75	 *   kvm:kvm_reenter means returning to guest immediately
 76	 */
 77	return evsel__name_is(evsel, kvm_entry_trace) || evsel__name_is(evsel, kvm_reenter_trace);
 78}
 79
 80static void event_gspr_get_key(struct evsel *evsel,
 81			       struct perf_sample *sample, struct event_key *key)
 82{
 83	unsigned int insn;
 84
 85	key->key = LOONGARCH_EXCEPTION_OTHERS;
 86	insn = evsel__intval(evsel, sample, "inst_word");
 87
 88	switch (insn >> 24) {
 89	case 0:
 90		/* CPUCFG inst trap */
 91		if ((insn >> 10) == 0x1b)
 92			key->key = LOONGARCH_EXCEPTION_CPUCFG;
 93		break;
 94	case 4:
 95		/* CSR inst trap */
 96		key->key = LOONGARCH_EXCEPTION_CSR;
 97		break;
 98	case 6:
 99		/* IOCSR inst trap */
100		if ((insn >> 15) == 0xc90)
101			key->key = LOONGARCH_EXCEPTION_IOCSR;
102		else if ((insn >> 15) == 0xc91)
103			/* Idle inst trap */
104			key->key = LOONGARCH_EXCEPTION_IDLE;
105		break;
106	default:
107		key->key = LOONGARCH_EXCEPTION_OTHERS;
108		break;
109	}
110}
111
112static struct child_event_ops child_events[] = {
113	{ .name = "kvm:kvm_exit_gspr", .get_key = event_gspr_get_key },
114	{ NULL, NULL },
115};
116
117static struct kvm_events_ops exit_events = {
118	.is_begin_event = event_begin,
119	.is_end_event = event_end,
120	.child_ops = child_events,
121	.decode_key = exit_event_decode_key,
122	.name = "VM-EXIT"
123};
124
125struct kvm_reg_events_ops kvm_reg_events_ops[] = {
126	{ .name	= "vmexit", .ops = &exit_events, },
127	{ NULL, NULL },
128};
129
130const char * const kvm_skip_events[] = {
131	NULL,
132};
133
134int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
135{
136	kvm->exit_reasons_isa = "loongarch64";
137	kvm->exit_reasons = loongarch_exit_reasons;
138	return 0;
139}