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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2022, Intel Corp. All rights reserved.
/* Some bits copied from ndctl monitor code */
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <event-parse.h>
#include <json-c/json.h>
#include <libgen.h>
#include <time.h>
#include <dirent.h>
#include <ccan/list/list.h>
#include <util/json.h>
#include <util/util.h>
#include <util/parse-options.h>
#include <util/parse-configs.h>
#include <util/strbuf.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <tracefs.h>
#include <cxl/libcxl.h>
/* reuse the core log helpers for the monitor logger */
#ifndef ENABLE_LOGGING
#define ENABLE_LOGGING
#endif
#ifndef ENABLE_DEBUG
#define ENABLE_DEBUG
#endif
#include <util/log.h>
#include <util/event_trace.h>
static const char *cxl_system = "cxl";
const char *default_log = "/var/log/cxl-monitor.log";
static struct monitor {
const char *log;
struct log_ctx ctx;
bool human;
bool verbose;
bool daemon;
} monitor;
static int monitor_event(struct cxl_ctx *ctx)
{
int fd, epollfd, rc = 0, timeout = -1;
struct epoll_event ev, *events;
struct tracefs_instance *inst;
struct event_ctx ectx;
int jflag;
events = calloc(1, sizeof(struct epoll_event));
if (!events) {
err(&monitor, "alloc for events error\n");
return -ENOMEM;
}
epollfd = epoll_create1(0);
if (epollfd == -1) {
rc = -errno;
err(&monitor, "epoll_create1() error: %d\n", rc);
goto epoll_err;
}
inst = tracefs_instance_create("cxl_monitor");
if (!inst) {
rc = -errno;
err(&monitor, "tracefs_instance_create( failed: %d\n", rc);
goto inst_err;
}
fd = tracefs_instance_file_open(inst, "trace_pipe", -1);
if (fd < 0) {
rc = fd;
err(&monitor, "tracefs_instance_file_open() err: %d\n", rc);
goto inst_file_err;
}
memset(&ev, 0, sizeof(ev));
ev.events = EPOLLIN;
ev.data.fd = fd;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) != 0) {
rc = -errno;
err(&monitor, "epoll_ctl() error: %d\n", rc);
goto epoll_ctl_err;
}
rc = trace_event_enable(inst, cxl_system, NULL);
if (rc < 0) {
err(&monitor, "trace_event_enable() failed: %d\n", rc);
goto event_en_err;
}
memset(&ectx, 0, sizeof(ectx));
ectx.system = cxl_system;
if (monitor.human)
jflag = JSON_C_TO_STRING_PRETTY;
else
jflag = JSON_C_TO_STRING_PLAIN;
while (1) {
struct jlist_node *jnode, *next;
rc = epoll_wait(epollfd, events, 1, timeout);
if (rc < 0) {
rc = -errno;
if (errno != EINTR)
err(&monitor, "epoll_wait error: %d\n", -errno);
break;
}
list_head_init(&ectx.jlist_head);
rc = trace_event_parse(inst, &ectx);
if (rc < 0)
goto parse_err;
if (list_empty(&ectx.jlist_head))
continue;
list_for_each_safe(&ectx.jlist_head, jnode, next, list) {
notice(&monitor, "%s\n",
json_object_to_json_string_ext(jnode->jobj, jflag));
list_del(&jnode->list);
json_object_put(jnode->jobj);
free(jnode);
}
}
parse_err:
if (trace_event_disable(inst) < 0)
err(&monitor, "failed to disable tracing\n");
event_en_err:
epoll_ctl_err:
close(fd);
inst_file_err:
tracefs_instance_free(inst);
inst_err:
close(epollfd);
epoll_err:
free(events);
return rc;
}
int cmd_monitor(int argc, const char **argv, struct cxl_ctx *ctx)
{
const struct option options[] = {
OPT_FILENAME('l', "log", &monitor.log,
"<file> | standard",
"where to output the monitor's notification"),
OPT_BOOLEAN('\0', "daemon", &monitor.daemon,
"run cxl monitor as a daemon"),
OPT_BOOLEAN('u', "human", &monitor.human,
"use human friendly output formats"),
OPT_BOOLEAN('v', "verbose", &monitor.verbose,
"emit extra debug messages to log"),
OPT_END(),
};
const char * const u[] = {
"cxl monitor [<options>]",
NULL
};
const char *prefix ="./";
int rc = 0, i;
const char *log;
argc = parse_options_prefix(argc, argv, prefix, options, u, 0);
for (i = 0; i < argc; i++)
error("unknown parameter \"%s\"\n", argv[i]);
if (argc)
usage_with_options(u, options);
/* sanity check */
if (monitor.daemon && monitor.log && !strncmp(monitor.log, "./", 2)) {
error("relative path or 'standard' are not compatible with daemon mode\n");
return -EINVAL;
}
log_init(&monitor.ctx, "cxl/monitor", "CXL_MONITOR_LOG");
if (monitor.log)
log = monitor.log;
else
log = monitor.daemon ? default_log : "./standard";
if (monitor.verbose)
monitor.ctx.log_priority = LOG_DEBUG;
else
monitor.ctx.log_priority = LOG_INFO;
if (strcmp(log, "./standard") == 0)
monitor.ctx.log_fn = log_standard;
else {
monitor.ctx.log_file = fopen(log, "a+");
if (!monitor.ctx.log_file) {
rc = -errno;
error("open %s failed: %d\n", log, rc);
goto out;
}
monitor.ctx.log_fn = log_file;
}
if (monitor.daemon) {
if (daemon(0, 0) != 0) {
err(&monitor, "daemon start failed\n");
goto out;
}
info(&monitor, "cxl monitor daemon started.\n");
}
rc = monitor_event(ctx);
out:
if (monitor.ctx.log_file)
fclose(monitor.ctx.log_file);
return rc;
}
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