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// SPDX-License-Identifier: LGPL-2.1-or-later
/**
* This file is part of libnvme.
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors: Keith Busch <keith.busch@wdc.com>
*/
/**
* Open all nvme controller's uevent and listen for changes. If NVME_AEN event
* is observed with controller telemetry data, read the log and save it to a
* file in /var/log/ with the device's unique name and epoch timestamp.
*/
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <libnvme.h>
#include <sys/stat.h>
#include <ccan/endian/endian.h>
struct events {
nvme_ctrl_t c;
int uevent_fd;
};
static int open_uevent(nvme_ctrl_t c)
{
char buf[0x1000];
if (snprintf(buf, sizeof(buf), "%s/uevent", nvme_ctrl_get_sysfs_dir(c)) < 0)
return -1;
return open(buf, O_RDONLY);
}
static void save_telemetry(nvme_ctrl_t c)
{
char buf[0x1000];
size_t log_size;
int ret, fd;
struct nvme_telemetry_log *log;
time_t s;
/* Clear the log (rae == false) at the end to see new telemetry events later */
ret = nvme_get_ctrl_telemetry(nvme_ctrl_get_fd(c), false, &log, NVME_TELEMETRY_DA_3, &log_size);
if (ret)
return;
s = time(NULL);
ret = snprintf(buf, sizeof(buf), "/var/log/%s-telemetry-%llu",
nvme_ctrl_get_subsysnqn(c), (unsigned long long)s);
if (ret < 0) {
free(log);
return;
}
fd = open(buf, O_CREAT|O_WRONLY, S_IRUSR|S_IRGRP);
if (fd < 0) {
free(log);
return;
}
ret = write(fd, log, log_size);
if (ret < 0)
printf("failed to write telemetry log\n");
else
printf("telemetry log save as %s, wrote:%d size:%zd\n", buf,
ret, log_size);
close(fd);
free(log);
}
static void check_telemetry(nvme_ctrl_t c, int ufd)
{
char buf[0x1000] = { 0 };
char *p, *ptr;
int len;
len = read(ufd, buf, sizeof(buf) - 1);
if (len < 0)
return;
ptr = buf;
while ((p = strsep(&ptr, "\n")) != NULL) {
__u32 aen, type, info, lid;
if (sscanf(p, "NVME_AEN=0x%08x", &aen) != 1)
continue;
type = aen & 0x07;
info = (aen >> 8) & 0xff;
lid = (aen >> 16) & 0xff;
printf("%s: aen type:%x info:%x lid:%d\n",
nvme_ctrl_get_name(c), type, info, lid);
if (type == NVME_AER_NOTICE &&
info == NVME_AER_NOTICE_TELEMETRY)
save_telemetry(c);
}
}
static void wait_events(fd_set *fds, struct events *e, int nr)
{
int ret, i;
for (i = 0; i < nr; i++)
check_telemetry(e[i].c, e[i].uevent_fd);
while (1) {
ret = select(nr, fds, NULL, NULL, NULL);
if (ret < 0)
return;
for (i = 0; i < nr; i++) {
if (!FD_ISSET(e[i].uevent_fd, fds))
continue;
check_telemetry(e[i].c, e[i].uevent_fd);
}
}
}
int main()
{
struct events *e;
fd_set fds;
int i = 0;
nvme_subsystem_t s;
nvme_ctrl_t c;
nvme_host_t h;
nvme_root_t r;
r = nvme_scan(NULL);
if (!r)
return EXIT_FAILURE;
nvme_for_each_host(r, h)
nvme_for_each_subsystem(h, s)
nvme_subsystem_for_each_ctrl(s, c)
i++;
e = calloc(i, sizeof(struct events));
FD_ZERO(&fds);
i = 0;
nvme_for_each_host(r, h) {
nvme_for_each_subsystem(h, s) {
nvme_subsystem_for_each_ctrl(s, c) {
int fd = open_uevent(c);
if (fd < 0)
continue;
FD_SET(fd, &fds);
e[i].uevent_fd = fd;
e[i].c = c;
i++;
}
}
}
wait_events(&fds, e, i);
nvme_free_tree(r);
free(e);
return EXIT_SUCCESS;
}
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