[PATCH 1/1] ipmi/watchdog: Add WDIOC_GETTIMELEFT ioctl

[Ryan O'Leary]

This is the same ioctl the rest of the watchdogs support. GETTIMELEFT
returns the number of seconds in the countdown -- useful for testing
whether the watchdog is functioning.

Signed-off-by: Ryan O'Leary <ryanole...@google.com>
---
 drivers/char/ipmi/ipmi_watchdog.c | 75 +++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_watchdog.c 
b/drivers/char/ipmi/ipmi_watchdog.c
index 32c334e34d55..f253c8667395 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -456,6 +456,71 @@ static int ipmi_set_timeout(int do_heartbeat)
        return rv;
 }
 
+static unsigned int __ipmi_get_timeout(struct ipmi_smi_msg  *smi_msg,
+                                      struct ipmi_recv_msg *recv_msg,
+                                      int                  *countdown)
+{
+       struct kernel_ipmi_msg            msg;
+       int                               rv = 0;
+       struct ipmi_system_interface_addr addr;
+
+
+       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,
+                                     smi_msg,
+                                     recv_msg,
+                                     1);
+       if (rv) {
+               pr_warn("get timeout error: %d\n", rv);
+               return rv;
+       }
+
+       wait_for_completion(&msg_wait);
+
+       if (recv_msg->msg.data_len < 9) {
+               pr_warn("get timeout response size: %d (expected 9)\n",
+                       recv_msg->msg.data_len);
+               return -EIO;
+       }
+
+       if (recv_msg->msg.data[0] != 0)  {
+               pr_warn("get timeout completion code error: %d\n",
+                       recv_msg->msg.data[0]);
+               return -EIO;
+       }
+
+       *countdown = WDOG_GET_TIMEOUT(recv_msg->msg.data[7], 
recv_msg->msg.data[8]);
+
+       return rv;
+}
+
+static int _ipmi_get_timeout(int *countdown)
+{
+       int rv;
+
+       if (!watchdog_user)
+               return -ENODEV;
+
+       atomic_set(&msg_tofree, 2);
+
+       rv = __ipmi_get_timeout(&smi_msg,
+                               &recv_msg,
+                               countdown);
+
+       return rv;
+}
+
 static atomic_t panic_done_count = ATOMIC_INIT(0);
 
 static void panic_smi_free(struct ipmi_smi_msg *msg)
@@ -729,6 +794,16 @@ static int ipmi_ioctl(struct file *file,
                        return -EFAULT;
                return 0;
 
+       case WDIOC_GETTIMELEFT:
+               val = 0;
+               i = _ipmi_get_timeout(&val);
+               if (i)
+                       return i;
+               i = copy_to_user(argp, &val, sizeof(val));
+               if (i)
+                       return -EFAULT;
+               return 0;
+
        default:
                return -ENOIOCTLCMD;
        }
-- 
2.31.0.rc2.261.g7f71774620-goog