2 files changed, 71 insertions, 2 deletions

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 2ed46b8efedf..822fbc32a2ae 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -94,6 +94,7 @@ static int abort_timeout = 60;
 static int reset_timeout = 60;
 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
+static int fast_fail = 1;
 
 static struct scsi_transport_template *ibmvscsi_transport_template;
 
@@ -114,6 +115,8 @@ module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
 module_param_named(max_requests, max_requests, int, S_IRUGO);
 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
+module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
 
 /* ------------------------------------------------------------
  * Routines for the event pool and event structs
@@ -863,6 +866,60 @@ static int send_srp_login(struct ibmvscsi_host_data *hostdata)
 };
 
 /**
+ * fast_fail_rsp: - Handle response to MAD enable fast fail
+ * @evt_struct: srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending enable fast fail. Gets called
+ * by ibmvscsi_handle_crq()
+ */
+static void fast_fail_rsp(struct srp_event_struct *evt_struct)
+{
+        struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+        u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
+
+        if (status == VIOSRP_MAD_NOT_SUPPORTED)
+                dev_err(hostdata->dev, "fast_fail not supported in server\n");
+        else if (status == VIOSRP_MAD_FAILED)
+                dev_err(hostdata->dev, "fast_fail request failed\n");
+        else if (status != VIOSRP_MAD_SUCCESS)
+                dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
+
+        send_srp_login(hostdata);
+}
+
+/**
+ * init_host - Start host initialization
+ * @hostdata:   ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+ */
+static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
+{
+        int rc;
+        unsigned long flags;
+        struct viosrp_fast_fail *fast_fail_mad;
+        struct srp_event_struct *evt_struct;
+
+        if (!fast_fail)
+                return send_srp_login(hostdata);
+
+        evt_struct = get_event_struct(&hostdata->pool);
+        BUG_ON(!evt_struct);
+
+        init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
+
+        fast_fail_mad = &evt_struct->iu.mad.fast_fail;
+        memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
+        fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
+        fast_fail_mad->common.length = sizeof(*fast_fail_mad);
+
+        spin_lock_irqsave(hostdata->host->host_lock, flags);
+        rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
+        spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+        return rc;
+}
+
+/**
  * adapter_info_rsp: - Handle response to MAD adapter info request
  * @evt_struct: srp_event_struct with the response
  *
@@ -903,7 +960,7 @@ static void adapter_info_rsp(struct srp_event_struct *evt_struct)
                 }
         }
 
-        send_srp_login(hostdata);
+        enable_fast_fail(hostdata);
 }
 
 /**
diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h
index 204604501ad8..f5a9c26d1da8 100644
--- a/drivers/scsi/ibmvscsi/viosrp.h
+++ b/drivers/scsi/ibmvscsi/viosrp.h
@@ -86,7 +86,14 @@ enum viosrp_mad_types {
         VIOSRP_EMPTY_IU_TYPE = 0x01,
         VIOSRP_ERROR_LOG_TYPE = 0x02,
         VIOSRP_ADAPTER_INFO_TYPE = 0x03,
-        VIOSRP_HOST_CONFIG_TYPE = 0x04
+        VIOSRP_HOST_CONFIG_TYPE = 0x04,
+        VIOSRP_ENABLE_FAST_FAIL = 0x08,
+};
+
+enum viosrp_mad_status {
+        VIOSRP_MAD_SUCCESS = 0x00,
+        VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
+        VIOSRP_MAD_FAILED = 0xF7,
 };
 
 /* 
@@ -127,11 +134,16 @@ struct viosrp_host_config {
         u64 buffer;
 };
 
+struct viosrp_fast_fail {
+        struct mad_common common;
+};
+
 union mad_iu {
         struct viosrp_empty_iu empty_iu;
         struct viosrp_error_log error_log;
         struct viosrp_adapter_info adapter_info;
         struct viosrp_host_config host_config;
+        struct viosrp_fast_fail fast_fail;
 };
 
 union viosrp_iu {