tools/perf/util/kvm-stat-arch/kvm-stat-loongarch.c

Source file repositories/reference/linux-study-clean/tools/perf/util/kvm-stat-arch/kvm-stat-loongarch.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/kvm-stat-arch/kvm-stat-loongarch.c
Extension
.c
Size
4145 bytes
Lines
153
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <memory.h>
#include <dwarf-regs.h>
#include "../kvm-stat.h"
#include "../parse-events.h"
#include "../debug.h"
#include "../evsel.h"
#include "../evlist.h"
#include "../pmus.h"

#define LOONGARCH_EXCEPTION_INT		0
#define LOONGARCH_EXCEPTION_PIL		1
#define LOONGARCH_EXCEPTION_PIS		2
#define LOONGARCH_EXCEPTION_PIF		3
#define LOONGARCH_EXCEPTION_PME		4
#define LOONGARCH_EXCEPTION_FPD		15
#define LOONGARCH_EXCEPTION_SXD		16
#define LOONGARCH_EXCEPTION_ASXD	17
#define LOONGARCH_EXCEPTION_GSPR	22
#define  LOONGARCH_EXCEPTION_CPUCFG	100
#define  LOONGARCH_EXCEPTION_CSR	101
#define  LOONGARCH_EXCEPTION_IOCSR	102
#define  LOONGARCH_EXCEPTION_IDLE	103
#define  LOONGARCH_EXCEPTION_OTHERS	104
#define LOONGARCH_EXCEPTION_HVC		23

#define loongarch_exception_type				\
	{LOONGARCH_EXCEPTION_INT,  "Interrupt" },		\
	{LOONGARCH_EXCEPTION_PIL,  "Mem Read" },		\
	{LOONGARCH_EXCEPTION_PIS,  "Mem Store" },		\
	{LOONGARCH_EXCEPTION_PIF,  "Inst Fetch" },		\
	{LOONGARCH_EXCEPTION_PME,  "Mem Modify" },		\
	{LOONGARCH_EXCEPTION_FPD,  "FPU" },			\
	{LOONGARCH_EXCEPTION_SXD,  "LSX" },			\
	{LOONGARCH_EXCEPTION_ASXD, "LASX" },			\
	{LOONGARCH_EXCEPTION_GSPR, "Privilege Error" },		\
	{LOONGARCH_EXCEPTION_HVC,  "Hypercall" },		\
	{LOONGARCH_EXCEPTION_CPUCFG, "CPUCFG" },		\
	{LOONGARCH_EXCEPTION_CSR,    "CSR" },			\
	{LOONGARCH_EXCEPTION_IOCSR,  "IOCSR" },			\
	{LOONGARCH_EXCEPTION_IDLE,   "Idle" },			\
	{LOONGARCH_EXCEPTION_OTHERS, "Others" }

define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type);

static const char *kvm_reenter_trace = "kvm:kvm_reenter";
static const char * const __kvm_events_tp[] = {
	"kvm:kvm_enter",
	"kvm:kvm_reenter",
	"kvm:kvm_exit",
	"kvm:kvm_exit_gspr",
	NULL,
};

static bool event_begin(struct evsel *evsel,
			struct perf_sample *sample, struct event_key *key)
{
	return exit_event_begin(evsel, sample, key);
}

static bool event_end(struct evsel *evsel,
		      struct perf_sample *sample __maybe_unused,
		      struct event_key *key __maybe_unused)
{
	/*
	 * LoongArch kvm is different with other architectures
	 *
	 * There is kvm:kvm_reenter or kvm:kvm_enter event adjacent with
	 * kvm:kvm_exit event.
	 *   kvm:kvm_enter   means returning to vmm and then to guest
	 *   kvm:kvm_reenter means returning to guest immediately
	 */
	return evsel__name_is(evsel, kvm_entry_trace(EM_LOONGARCH)) ||
	       evsel__name_is(evsel, kvm_reenter_trace);
}

static void event_gspr_get_key(struct evsel *evsel,
			       struct perf_sample *sample, struct event_key *key)
{
	unsigned int insn;

	key->key = LOONGARCH_EXCEPTION_OTHERS;
	insn = evsel__intval(evsel, sample, "inst_word");

	switch (insn >> 24) {
	case 0:
		/* CPUCFG inst trap */
		if ((insn >> 10) == 0x1b)
			key->key = LOONGARCH_EXCEPTION_CPUCFG;

Annotation

Implementation Notes