From: Corey Minyard <cminyard@xxxxxxxxxx>
The function is there and it can be done, so add it to round out the
functionality.
Signed-off-by: Corey Minyard <cminyard@xxxxxxxxxx>
---
drivers/char/ipmi/ipmi_watchdog.c | 80 +++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 1ee884e6dcac..e0dd820af3a9 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -722,6 +722,85 @@ static int ipmi_wdog_stop(struct watchdog_device *wdd)
return 0;
}
+/*
+ * These are for fetching the current watchdog timeout. We use a
+ * separate set so we don't block a time set when getting the time.
+ */
+static DEFINE_MUTEX(ipmi_wdog_get_mutex);
+static atomic_t get_msg_tofree = ATOMIC_INIT(0);
+static DECLARE_COMPLETION(get_msg_wait);
+static void get_msg_free_smi(struct ipmi_smi_msg *msg)
+{
+ if (atomic_dec_and_test(&get_msg_tofree))
+ complete(&get_msg_wait);
+}
+static void get_msg_free_recv(struct ipmi_recv_msg *msg)
+{
+ if (atomic_dec_and_test(&get_msg_tofree))
+ complete(&get_msg_wait);
+}
+static struct ipmi_smi_msg get_smi_msg = {
+ .done = get_msg_free_smi
+};
+static struct ipmi_recv_msg get_recv_msg = {
+ .done = get_msg_free_recv
+};
+
+static unsigned int ipmi_wdog_get_timeleft(struct watchdog_device *wdd)
+{
+ struct kernel_ipmi_msg msg;
+ struct ipmi_system_interface_addr addr;
+ unsigned char *data;
+ int rv;
+ unsigned int currtime = 0;
+
+ mutex_lock(&ipmi_wdog_get_mutex);
+
+ atomic_set(&get_msg_tofree, 2);
+
+ addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
+ addr.channel = IPMI_BMC_CHANNEL;
+ addr.lun = 0;
+
+ msg.netfn = 0x06;
+ msg.cmd = IPMI_WDOG_GET_TIMER;
+ msg.data = NULL;
+ msg.data_len = 0;
+ rv = ipmi_request_supply_msgs(watchdog_user,
+ (struct ipmi_addr *) &addr,
+ 0, &msg, NULL,
+ &get_smi_msg, &get_recv_msg, 1);
+ if (rv) {
+ pr_warn("get timeout error: %d\n", rv);
+ goto out;
+ }
+
+ wait_for_completion(&get_msg_wait);
+
+ if (get_recv_msg.msg.data_len < 1) {
+ pr_warn("get timeout received zero length message\n");
+ goto out;
+ }
+
+ data = get_recv_msg.msg.data;
+ if (data[0] != 0) {
+ pr_warn("get timeout received error: 0x%x\n", data[0]);
+ goto out;
+ }
+
+ if (get_recv_msg.msg.data_len < 9) {
+ pr_warn("get timeout received message too small, expected 9, got %u\n",
+ get_recv_msg.msg.data_len);
+ goto out;
+ }
+
+ currtime = data[7] | data[8] << 8;
+ currtime /= 10;
+ out:
+ mutex_unlock(&ipmi_wdog_get_mutex);
+ return currtime;
+}
+
static ssize_t ipmi_wdog_read(struct watchdog_device *wdd,
struct file *file,
char __user *buf,
@@ -806,6 +885,7 @@ static const struct watchdog_ops ipmi_wdog_ops = {
.set_timeout = ipmi_wdog_set_timeout,
.set_pretimeout = ipmi_wdog_set_pretimeout,
.ping = ipmi_wdog_ping,
+ .get_timeleft = ipmi_wdog_get_timeleft,
.read = ipmi_wdog_read,
.poll = ipmi_wdog_poll,
.fasync = ipmi_wdog_fasync,
--
2.17.1
