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perf kvm: Add kvm-stat for loongarch64
Add support for 'perf kvm stat' on loongarch64 platform, now only kvm exit event is supported. Here is example output about "perf kvm --host stat report" command Event name Samples Sample% Time (ns) Time% Mean Time (ns) Mem Store 83969 51.00% 625697070 8.00% 7451 Mem Read 37641 22.00% 112485730 1.00% 2988 Interrupt 15542 9.00% 20620190 0.00% 1326 IOCSR 15207 9.00% 94296190 1.00% 6200 Hypercall 4873 2.00% 12265280 0.00% 2516 Idle 3713 2.00% 6322055860 87.00% 1702681 FPU 1819 1.00% 2750300 0.00% 1511 Inst Fetch 502 0.00% 1341740 0.00% 2672 Mem Modify 324 0.00% 602240 0.00% 1858 CPUCFG 55 0.00% 77610 0.00% 1411 CSR 12 0.00% 19690 0.00% 1640 LASX 3 0.00% 4870 0.00% 1623 LSX 2 0.00% 2100 0.00% 1050 Signed-off-by: Bibo Mao <[email protected]> Signed-off-by: Huacai Chen <[email protected]>
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‎tools/perf/arch/loongarch/Makefile

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@@ -4,6 +4,7 @@ PERF_HAVE_DWARF_REGS := 1
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endif
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PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
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PERF_HAVE_JITDUMP := 1
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HAVE_KVM_STAT_SUPPORT := 1
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#
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# Syscall table generation for perf

‎tools/perf/arch/loongarch/util/Build

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@@ -1,5 +1,7 @@
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perf-y += header.o
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perf-y += perf_regs.o
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perf-$(CONFIG_DWARF) += dwarf-regs.o
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perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
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perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
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perf-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o

‎tools/perf/arch/loongarch/util/header.c

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@@ -0,0 +1,96 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Implementation of get_cpuid().
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*
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* Author: Nikita Shubin <[email protected]>
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* Bibo Mao <[email protected]>
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* Huacai Chen <[email protected]>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <api/fs/fs.h>
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#include <errno.h>
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#include "util/debug.h"
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#include "util/header.h"
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/*
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* Output example from /proc/cpuinfo
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* CPU Family : Loongson-64bit
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* Model Name : Loongson-3C5000
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* CPU Revision : 0x10
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* FPU Revision : 0x01
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*/
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#define CPUINFO_MODEL "Model Name"
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#define CPUINFO "/proc/cpuinfo"
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static char *_get_field(const char *line)
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{
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char *line2, *nl;
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line2 = strrchr(line, ' ');
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if (!line2)
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return NULL;
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line2++;
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nl = strrchr(line, '\n');
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if (!nl)
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return NULL;
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return strndup(line2, nl - line2);
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}
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static char *_get_cpuid(void)
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{
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unsigned long line_sz;
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char *line, *model, *cpuid;
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FILE *file;
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file = fopen(CPUINFO, "r");
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if (file == NULL)
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return NULL;
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line = model = cpuid = NULL;
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while (getline(&line, &line_sz, file) != -1) {
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if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL)))
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continue;
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model = _get_field(line);
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if (!model)
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goto out_free;
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break;
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}
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if (model && (asprintf(&cpuid, "%s", model) < 0))
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cpuid = NULL;
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out_free:
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fclose(file);
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free(model);
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return cpuid;
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}
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int get_cpuid(char *buffer, size_t sz)
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{
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int ret = 0;
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char *cpuid = _get_cpuid();
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if (!cpuid)
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return EINVAL;
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if (sz < strlen(cpuid)) {
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ret = ENOBUFS;
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goto out_free;
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}
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scnprintf(buffer, sz, "%s", cpuid);
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out_free:
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free(cpuid);
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return ret;
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}
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char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
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{
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return _get_cpuid();
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}

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

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// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <memory.h>
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#include "util/kvm-stat.h"
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#include "util/parse-events.h"
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#include "util/debug.h"
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#include "util/evsel.h"
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#include "util/evlist.h"
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#include "util/pmus.h"
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#define LOONGARCH_EXCEPTION_INT 0
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#define LOONGARCH_EXCEPTION_PIL 1
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#define LOONGARCH_EXCEPTION_PIS 2
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#define LOONGARCH_EXCEPTION_PIF 3
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#define LOONGARCH_EXCEPTION_PME 4
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#define LOONGARCH_EXCEPTION_FPD 15
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#define LOONGARCH_EXCEPTION_SXD 16
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#define LOONGARCH_EXCEPTION_ASXD 17
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#define LOONGARCH_EXCEPTION_GSPR 22
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#define LOONGARCH_EXCEPTION_CPUCFG 100
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#define LOONGARCH_EXCEPTION_CSR 101
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#define LOONGARCH_EXCEPTION_IOCSR 102
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#define LOONGARCH_EXCEPTION_IDLE 103
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#define LOONGARCH_EXCEPTION_OTHERS 104
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#define LOONGARCH_EXCEPTION_HVC 23
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#define loongarch_exception_type \
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{LOONGARCH_EXCEPTION_INT, "Interrupt" }, \
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{LOONGARCH_EXCEPTION_PIL, "Mem Read" }, \
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{LOONGARCH_EXCEPTION_PIS, "Mem Store" }, \
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{LOONGARCH_EXCEPTION_PIF, "Inst Fetch" }, \
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{LOONGARCH_EXCEPTION_PME, "Mem Modify" }, \
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{LOONGARCH_EXCEPTION_FPD, "FPU" }, \
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{LOONGARCH_EXCEPTION_SXD, "LSX" }, \
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{LOONGARCH_EXCEPTION_ASXD, "LASX" }, \
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{LOONGARCH_EXCEPTION_GSPR, "Privilege Error" }, \
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{LOONGARCH_EXCEPTION_HVC, "Hypercall" }, \
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{LOONGARCH_EXCEPTION_CPUCFG, "CPUCFG" }, \
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{LOONGARCH_EXCEPTION_CSR, "CSR" }, \
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{LOONGARCH_EXCEPTION_IOCSR, "IOCSR" }, \
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{LOONGARCH_EXCEPTION_IDLE, "Idle" }, \
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{LOONGARCH_EXCEPTION_OTHERS, "Others" }
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define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type);
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const char *vcpu_id_str = "vcpu_id";
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const char *kvm_exit_reason = "reason";
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const char *kvm_entry_trace = "kvm:kvm_enter";
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const char *kvm_reenter_trace = "kvm:kvm_reenter";
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const char *kvm_exit_trace = "kvm:kvm_exit";
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const char *kvm_events_tp[] = {
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"kvm:kvm_enter",
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"kvm:kvm_reenter",
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"kvm:kvm_exit",
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"kvm:kvm_exit_gspr",
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NULL,
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};
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static bool event_begin(struct evsel *evsel,
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struct perf_sample *sample, struct event_key *key)
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{
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return exit_event_begin(evsel, sample, key);
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}
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static bool event_end(struct evsel *evsel,
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struct perf_sample *sample __maybe_unused,
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struct event_key *key __maybe_unused)
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{
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/*
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* LoongArch kvm is different with other architectures
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*
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* There is kvm:kvm_reenter or kvm:kvm_enter event adjacent with
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* kvm:kvm_exit event.
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* kvm:kvm_enter means returning to vmm and then to guest
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* kvm:kvm_reenter means returning to guest immediately
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*/
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return evsel__name_is(evsel, kvm_entry_trace) || evsel__name_is(evsel, kvm_reenter_trace);
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}
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static void event_gspr_get_key(struct evsel *evsel,
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struct perf_sample *sample, struct event_key *key)
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{
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unsigned int insn;
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key->key = LOONGARCH_EXCEPTION_OTHERS;
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insn = evsel__intval(evsel, sample, "inst_word");
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switch (insn >> 24) {
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case 0:
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/* CPUCFG inst trap */
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if ((insn >> 10) == 0x1b)
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key->key = LOONGARCH_EXCEPTION_CPUCFG;
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break;
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case 4:
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/* CSR inst trap */
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key->key = LOONGARCH_EXCEPTION_CSR;
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break;
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case 6:
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/* IOCSR inst trap */
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if ((insn >> 15) == 0xc90)
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key->key = LOONGARCH_EXCEPTION_IOCSR;
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else if ((insn >> 15) == 0xc91)
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/* Idle inst trap */
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key->key = LOONGARCH_EXCEPTION_IDLE;
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break;
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default:
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key->key = LOONGARCH_EXCEPTION_OTHERS;
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break;
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}
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}
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static struct child_event_ops child_events[] = {
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{ .name = "kvm:kvm_exit_gspr", .get_key = event_gspr_get_key },
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{ NULL, NULL },
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};
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static struct kvm_events_ops exit_events = {
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.is_begin_event = event_begin,
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.is_end_event = event_end,
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.child_ops = child_events,
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.decode_key = exit_event_decode_key,
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.name = "VM-EXIT"
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};
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struct kvm_reg_events_ops kvm_reg_events_ops[] = {
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{ .name = "vmexit", .ops = &exit_events, },
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{ NULL, NULL },
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};
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const char * const kvm_skip_events[] = {
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NULL,
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};
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int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
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{
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kvm->exit_reasons_isa = "loongarch64";
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kvm->exit_reasons = loongarch_exit_reasons;
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return 0;
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}

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