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dm:replace shutdown_uos_thread with a new one

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Change shutdown_uos_thread to pm_monitor thread,
the shutdown_uos_thread can do:
 --send shutdown request to UOS
 --receive acked message from UOS
the pm_monitor can do:
 --send shutdown request to UOS
 --receive acked message from UOS
 --receive shutdown request from UOS

Tracked-On: #4446
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Reviewed-by: Minggui Cao <minggui.cao@intel.com>
Reviewed-by: Shuo A Liu <shuo.a.liu@intel.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
This commit is contained in:
Mingqiang Chi 2020-03-03 16:24:14 +08:00 committed by wenlingz
parent 7e9b7a8c34
commit 4fdc2be129
1 changed files with 111 additions and 79 deletions
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190
devicemodel/core/pm_vuart.c
View File

@ -25,11 +25,10 @@
#include "pty_vuart.h"
#include "log.h"
#define SHUTDOWN_UOS_CMD "shutdown"
#define SHUTDOWN_CMD "shutdown"
#define SHUTDOWN_CMD_ACK "acked"
#define CMD_LEN 16
#define WAIT_SND_CNT 3
#define WAIT_ACK_CNT 5
#define RESEND_CMD_CNT 3
#define MAX_NODE_PATH 128
static const char * const node_name[] = {
@ -43,16 +42,111 @@ enum node_type_t {
MAX_NODE_CNT,
};
/* Enumerated shutdown state machine */
enum shutdown_state {
SHUTDOWN_REQ_WAITING = 0, /* Can receive shutdown cmd in this state */
SHUTDOWN_ACK_WAITING, /* Wait acked message from UOS */
SHUTDOWN_REQ_FROM_SOS, /* Trigger shutdown by SOS */
SHUTDOWN_REQ_FROM_UOS, /* Trigger shutdown by UOS */
};
static uint8_t node_index = MAX_NODE_CNT;
static char node_path[MAX_NODE_PATH];
static int node_fd = -1;
static bool shutdown_uos_thread_started = false;
static pthread_t shutdown_uos_thread_pid;
static enum shutdown_state pm_monitor_state = SHUTDOWN_REQ_WAITING;
static pthread_t pm_monitor_thread;
static int vm_stop_handler(void *arg);
static struct monitor_vm_ops vm_ops = {
.stop = vm_stop_handler,
};
/* it read from vuart, and if end is '\0' or '\n' or len = buff-len it will return */
static int read_bytes(int fd, uint8_t *buffer, int buf_len)
{
int rc = 0, count = 0;
do {
rc = read(fd, buffer + count, buf_len - count);
if (rc > 0) {
count += rc;
if ((buffer[count - 1] == '\0') || (buffer[count - 1] == '\n') ||
(count == buf_len)) {
break;
}
}
} while (rc > 0);
return count;
}
/*
* this pm_monitor can do:
* --send shutdown request to UOS
* --receive acked message from UOS
* --receive shutdown request from UOS
*/
static void *pm_monitor_loop(void *arg)
{
int rc;
int retry = RESEND_CMD_CNT;
char buf[CMD_LEN];
while (1) {
rc = read_bytes(node_fd, (uint8_t *)buf, CMD_LEN);
switch (pm_monitor_state) {
/* Waiting acked message from UOS, this is triggered by SOS */
case SHUTDOWN_ACK_WAITING:
/* Once received the SHUTDOWN ACK from UOS, then wait UOS to set ACPI PM register to change
* VM to POWEROFF state
*/
if ((rc > 0) && (strncmp(SHUTDOWN_CMD_ACK, (const char *)buf, strlen(SHUTDOWN_CMD_ACK)) == 0)) {
pr_info("received acked message from uos\n");
} else {
/* it will try to resend shutdown cmd to UOS if there is no acked message from UOS */
if (retry > 0) {
if (write(node_fd, SHUTDOWN_CMD, sizeof(SHUTDOWN_CMD))
!= sizeof(SHUTDOWN_CMD)) {
pr_err("Try resend shutdown cmd failed cnt = %d\n", retry);
}
retry--;
} else {
/* If there is no acked message from UOS, just ignore the shutdown request
* from SOS, and the SOS can re-trigger shutdown flow,
* so it need restore the pm_monitor_state
*/
pr_err("Can not receive acked message from uos, have try %d times\r\n",
RESEND_CMD_CNT);
pm_monitor_state = SHUTDOWN_REQ_WAITING;
retry = RESEND_CMD_CNT;
}
}
break;
default:
pr_err("Invalid pm_monitor_state(0x%x)\r\n", pm_monitor_state);
break;
}
sleep(1);
}
return NULL;
}
static int start_pm_monitor_thread(void)
{
int ret;
ret = pthread_create(&pm_monitor_thread, NULL, pm_monitor_loop, NULL);
if (ret) {
pr_err("failed %s %d\n", __func__, __LINE__);
return -1;
}
pthread_setname_np(pm_monitor_thread, "pm_monitor");
return 0;
}
/*
* --pm_vuart configuration is in the following 2 forms:
@ -145,6 +239,8 @@ void pm_by_vuart_init(struct vmctx *ctx)
} else {
pr_err("%s open failed, fd=%d\n", node_path, node_fd);
}
start_pm_monitor_thread();
}
void pm_by_vuart_deinit(struct vmctx *ctx)
@ -153,69 +249,6 @@ void pm_by_vuart_deinit(struct vmctx *ctx)
node_fd = -1;
}
/* it read from vuart, and if end is '\0' or '\n' or len = buff-len it will return */
static int read_bytes(int fd, uint8_t *buffer, int buf_len)
{
int rc, offset = 0;
do {
rc = read(fd, buffer + offset, buf_len - offset);
if (rc > 0) {
offset += rc;
if ((buffer[offset - 1] == '\0') || (buffer[offset - 1] == '\n') ||
(offset == buf_len)) {
break;
}
}
} while (rc > 0);
return offset;
}
/* thread to send shutdown cmd to uos and wait acked from it */
static void *shutdown_uos_thread(void *arg)
{
int rc, wait_snd, wait_ack;
char buffer[CMD_LEN];
wait_snd = WAIT_SND_CNT;
while (wait_snd > 0) {
rc = write(node_fd, SHUTDOWN_UOS_CMD, strlen(SHUTDOWN_UOS_CMD));
if (rc < 0) {
pr_err("send shutdown cmd to uos failed!\n");
break;
}
sleep(1); /* wait 1 second to communicate with UOS */
wait_ack = WAIT_ACK_CNT;
while (wait_ack > 0) {
rc = read_bytes(node_fd, (uint8_t *)buffer, CMD_LEN - 1);
if ((rc > 0) && strncmp(buffer, SHUTDOWN_CMD_ACK, strlen(SHUTDOWN_CMD_ACK)) == 0) {
pr_info("received acked from UOS\n");
break;
}
sleep(1);
wait_ack--;
}
if (wait_ack > 0) {
break;
}
wait_snd--;
}
if ((wait_snd == 0) && (wait_ack == 0)) {
pr_err("not received acked from UOS\n");
}
shutdown_uos_thread_started = false;
return NULL;
}
/* called when acrn-dm receive stop command */
static int vm_stop_handler(void *arg)
{
@ -229,22 +262,21 @@ static int vm_stop_handler(void *arg)
return -1;
}
if (shutdown_uos_thread_started) {
pr_info("stop cmd send thread started!\n");
/* will ignore this shutdown command if it is shutdowning */
if (pm_monitor_state != SHUTDOWN_REQ_WAITING) {
pr_err("can not shutdown in this state(0x%x),it is shutdowning\n", pm_monitor_state);
return -1;
}
shutdown_uos_thread_started = true;
ret = pthread_create(&shutdown_uos_thread_pid, NULL, shutdown_uos_thread, NULL);
if (ret) {
pr_err("failed %s %d\n", __func__, __LINE__);
shutdown_uos_thread_pid = 0;
shutdown_uos_thread_started = false;
return -1;
pm_monitor_state = SHUTDOWN_REQ_FROM_SOS;
ret = write(node_fd, SHUTDOWN_CMD, sizeof(SHUTDOWN_CMD));
if (ret != sizeof(SHUTDOWN_CMD)) {
/* no need to resend shutdown here, will resend in pm_monitor thread */
pr_err("send shutdown command to uos failed\r\n");
}
pr_info("created shutdown uos thread.\n");
pthread_setname_np(shutdown_uos_thread_pid, "shutdown_uos");
/* it will handle acked and resend shutdown cmd in pm_monitor thread */
pm_monitor_state = SHUTDOWN_ACK_WAITING;
return 0;
}