blob: 5f851dfd1cbda579f5d4722caec65f940396c33a [file] [log] [blame]
/*
* Mailbox Daemon Implementation
*
* Copyright 2016 IBM
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <poll.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <sys/signalfd.h>
#include <time.h>
#include <unistd.h>
#include <inttypes.h>
#include <systemd/sd-bus.h>
#include "config.h"
#include "mbox.h"
#include "common.h"
#include "dbus.h"
#include "mboxd_dbus.h"
#include "mboxd_flash.h"
#include "mboxd_lpc.h"
#include "mboxd_msg.h"
#include "mboxd_windows.h"
#define USAGE \
"\nUsage: %s [-V | --version] [-h | --help] [-v[v] | --verbose] [-s | --syslog]\n" \
"\t\t[-n | --window-num <num>]\n" \
"\t\t[-w | --window-size <size>M]\n" \
"\t\t-f | --flash <size>[K|M]\n\n" \
"\t-v | --verbose\t\tBe [more] verbose\n" \
"\t-s | --syslog\t\tLog output to syslog (pointless without -v)\n" \
"\t-n | --window-num\tThe number of windows\n" \
"\t\t\t\t(default: fill the reserved memory region)\n" \
"\t-w | --window-size\tThe window size (power of 2) in MB\n" \
"\t\t\t\t(default: 1MB)\n" \
"\t-f | --flash\t\tSize of flash in [K|M] bytes\n\n"
static int poll_loop(struct mbox_context *context)
{
int rc = 0, i;
/* Set POLLIN on polling file descriptors */
for (i = 0; i < POLL_FDS; i++) {
context->fds[i].events = POLLIN;
}
while (1) {
rc = poll(context->fds, POLL_FDS, -1);
if (rc < 0) { /* Error */
MSG_ERR("Error from poll(): %s\n", strerror(errno));
break; /* This should mean we clean up nicely */
}
/* Event on Polled File Descriptor - Handle It */
if (context->fds[SIG_FD].revents & POLLIN) { /* Signal */
struct signalfd_siginfo info = { 0 };
rc = read(context->fds[SIG_FD].fd, (void *) &info,
sizeof(info));
if (rc != sizeof(info)) {
MSG_ERR("Error reading signal event: %s\n",
strerror(errno));
}
MSG_DBG("Received signal: %d\n", info.ssi_signo);
switch (info.ssi_signo) {
case SIGINT:
case SIGTERM:
MSG_INFO("Caught Signal - Exiting...\n");
context->terminate = true;
break;
case SIGHUP:
/* Host didn't request reset -> Notify it */
reset_all_windows(context, SET_BMC_EVENT);
rc = point_to_flash(context);
if (rc < 0) {
MSG_ERR("WARNING: Failed to point the "
"LPC bus back to flash on "
"SIGHUP\nIf the host requires "
"this expect problems...\n");
}
break;
default:
MSG_ERR("Unhandled Signal: %d\n",
info.ssi_signo);
break;
}
}
if (context->fds[DBUS_FD].revents & POLLIN) { /* DBUS */
while ((rc = sd_bus_process(context->bus, NULL)) > 0) {
MSG_DBG("DBUS Event\n");
}
if (rc < 0) {
MSG_ERR("Error handling DBUS event: %s\n",
strerror(-rc));
}
}
if (context->terminate) {
break; /* This should mean we clean up nicely */
}
if (context->fds[MBOX_FD].revents & POLLIN) { /* MBOX */
MSG_DBG("MBOX Event\n");
rc = dispatch_mbox(context);
if (rc < 0) {
MSG_ERR("Error handling MBOX event\n");
}
}
}
/* Best to reset windows and point back to flash for safety */
/* Host didn't request reset -> Notify it */
reset_all_windows(context, SET_BMC_EVENT);
rc = point_to_flash(context);
/* Not much we can do if this fails */
if (rc < 0) {
MSG_ERR("WARNING: Failed to point the LPC bus back to flash\n"
"If the host requires this expect problems...\n");
}
return rc;
}
static int init_signals(struct mbox_context *context, sigset_t *set)
{
int rc;
/* Block SIGHUPs, SIGTERMs and SIGINTs */
sigemptyset(set);
sigaddset(set, SIGHUP);
sigaddset(set, SIGINT);
sigaddset(set, SIGTERM);
rc = sigprocmask(SIG_BLOCK, set, NULL);
if (rc < 0) {
MSG_ERR("Failed to set SIG_BLOCK mask %s\n", strerror(errno));
return rc;
}
/* Get Signal File Descriptor */
rc = signalfd(-1, set, SFD_NONBLOCK);
if (rc < 0) {
MSG_ERR("Failed to get signalfd %s\n", strerror(errno));
return rc;
}
context->fds[SIG_FD].fd = rc;
return 0;
}
static void usage(const char *name)
{
printf(USAGE, name);
}
static bool parse_cmdline(int argc, char **argv,
struct mbox_context *context)
{
char *endptr;
int opt;
static const struct option long_options[] = {
{ "flash", required_argument, 0, 'f' },
{ "window-size", optional_argument, 0, 'w' },
{ "window-num", optional_argument, 0, 'n' },
{ "verbose", no_argument, 0, 'v' },
{ "syslog", no_argument, 0, 's' },
{ "version", no_argument, 0, 'V' },
{ "help", no_argument, 0, 'h' },
{ 0, 0, 0, 0 }
};
verbosity = MBOX_LOG_NONE;
mbox_vlog = &mbox_log_console;
context->current = NULL; /* No current window */
while ((opt = getopt_long(argc, argv, "f:w::n::vsVh", long_options, NULL))
!= -1) {
switch (opt) {
case 0:
break;
case 'f':
context->flash_size = strtol(optarg, &endptr, 10);
if (optarg == endptr) {
fprintf(stderr, "Unparseable flash size\n");
return false;
}
switch (*endptr) {
case '\0':
break;
case 'M':
context->flash_size <<= 10;
case 'K':
context->flash_size <<= 10;
break;
default:
fprintf(stderr, "Unknown units '%c'\n",
*endptr);
return false;
}
break;
case 'n':
context->windows.num = strtol(argv[optind], &endptr,
10);
if (optarg == endptr || *endptr != '\0') {
fprintf(stderr, "Unparseable window num\n");
return false;
}
break;
case 'w':
context->windows.default_size = strtol(argv[optind],
&endptr, 10);
context->windows.default_size <<= 20; /* Given in MB */
if (optarg == endptr || (*endptr != '\0' &&
*endptr != 'M')) {
fprintf(stderr, "Unparseable window size\n");
return false;
}
if (!is_power_of_2(context->windows.default_size)) {
fprintf(stderr, "Window size not power of 2\n");
return false;
}
break;
case 'v':
verbosity++;
break;
case 's':
/* Avoid a double openlog() */
if (mbox_vlog != &vsyslog) {
openlog(PREFIX, LOG_ODELAY, LOG_DAEMON);
mbox_vlog = &vsyslog;
}
break;
case 'V':
printf("%s V%s\n", THIS_NAME, PACKAGE_VERSION);
exit(0);
case 'h':
return false; /* This will print the usage message */
default:
return false;
}
}
if (!context->flash_size) {
fprintf(stderr, "Must specify a non-zero flash size\n");
return false;
}
MSG_INFO("Flash size: 0x%.8x\n", context->flash_size);
if (verbosity) {
MSG_INFO("%s logging\n", verbosity == MBOX_LOG_DEBUG ? "Debug" :
"Verbose");
}
return true;
}
int main(int argc, char **argv)
{
struct mbox_context *context;
char *name = argv[0];
sigset_t set;
int rc, i;
context = calloc(1, sizeof(*context));
if (!context) {
fprintf(stderr, "Memory allocation failed\n");
exit(1);
}
if (!parse_cmdline(argc, argv, context)) {
usage(name);
free(context);
exit(0);
}
for (i = 0; i < TOTAL_FDS; i++) {
context->fds[i].fd = -1;
}
MSG_INFO("Starting Daemon\n");
rc = init_signals(context, &set);
if (rc) {
goto finish;
}
rc = init_mbox_dev(context);
if (rc) {
goto finish;
}
rc = init_lpc_dev(context);
if (rc) {
goto finish;
}
/* We've found the reserved memory region -> we can assign to windows */
rc = init_windows(context);
if (rc) {
goto finish;
}
rc = init_flash_dev(context);
if (rc) {
goto finish;
}
rc = init_mboxd_dbus(context);
if (rc) {
goto finish;
}
/* Set the LPC bus mapping to point to the physical flash device */
rc = point_to_flash(context);
if (rc) {
goto finish;
}
rc = set_bmc_events(context, BMC_EVENT_DAEMON_READY, SET_BMC_EVENT);
if (rc) {
goto finish;
}
MSG_INFO("Entering Polling Loop\n");
rc = poll_loop(context);
MSG_INFO("Exiting Poll Loop: %d\n", rc);
finish:
MSG_INFO("Daemon Exiting...\n");
clr_bmc_events(context, BMC_EVENT_DAEMON_READY, SET_BMC_EVENT);
free_mboxd_dbus(context);
free_flash_dev(context);
free_lpc_dev(context);
free_mbox_dev(context);
free_windows(context);
free(context);
return rc;
}