[SCSI] ibmvscsi: handle re-enable firmware message

New versions of the Power5 firmware can send a "re-enable" message to
the virtual scsi adapter.  This fix makes us handle the message
correctly.  Without it, the driver goes catatonic and the system crashes
unpleasantly.

Signed-off-by: Dave Boutcher <sleddog@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

4 files changed, 74 insertions, 31 deletions

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 822b9fa706f3..eaefeddb2b4a 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -87,7 +87,7 @@ static int max_channel = 3;
 static int init_timeout = 5;
 static int max_requests = 50;
 
-#define IBMVSCSI_VERSION "1.5.7"
+#define IBMVSCSI_VERSION "1.5.8"
 
 MODULE_DESCRIPTION("IBM Virtual SCSI");
 MODULE_AUTHOR("Dave Boutcher");
@@ -534,7 +534,6 @@ static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
                                    struct ibmvscsi_host_data *hostdata)
 {
-        struct scsi_cmnd *cmnd;
         u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
         int rc;
 
@@ -544,19 +543,8 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
          * can handle more requests (can_queue) when we actually can't
          */
         if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) &&
-            (atomic_dec_if_positive(&hostdata->request_limit) < 0)) {
-                /* See if the adapter is disabled */
-                if (atomic_read(&hostdata->request_limit) < 0)
-                        goto send_error;
-        
-                printk(KERN_WARNING 
-                       "ibmvscsi: Warning, request_limit exceeded\n");
-                unmap_cmd_data(&evt_struct->iu.srp.cmd,
-                               evt_struct,
-                               hostdata->dev);
-                free_event_struct(&hostdata->pool, evt_struct);
-                return SCSI_MLQUEUE_HOST_BUSY;
-        }
+            (atomic_dec_if_positive(&hostdata->request_limit) < 0))
+                goto send_error;
 
         /* Copy the IU into the transfer area */
         *evt_struct->xfer_iu = evt_struct->iu;
@@ -572,7 +560,7 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
              ibmvscsi_send_crq(hostdata, crq_as_u64[0], crq_as_u64[1])) != 0) {
                 list_del(&evt_struct->list);
 
-                printk(KERN_ERR "ibmvscsi: failed to send event struct rc %d\n",
+                printk(KERN_ERR "ibmvscsi: send error %d\n",
                        rc);
                 goto send_error;
         }
@@ -582,14 +570,8 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
  send_error:
         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
 
-        if ((cmnd = evt_struct->cmnd) != NULL) {
-                cmnd->result = DID_ERROR << 16;
-                evt_struct->cmnd_done(cmnd);
-        } else if (evt_struct->done)
-                evt_struct->done(evt_struct);
-        
         free_event_struct(&hostdata->pool, evt_struct);
-        return 0;
+        return SCSI_MLQUEUE_HOST_BUSY;
 }
 
 /**
@@ -802,7 +784,8 @@ static void login_rsp(struct srp_event_struct *evt_struct)
         case SRP_LOGIN_RSP_TYPE:        /* it worked! */
                 break;
         case SRP_LOGIN_REJ_TYPE:        /* refused! */
-                printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REQ rejected\n");
+                printk(KERN_INFO "ibmvscsi: SRP_LOGIN_REJ reason %u\n",
+                       evt_struct->xfer_iu->srp.login_rej.reason);
                 /* Login failed.  */
                 atomic_set(&hostdata->request_limit, -1);
                 return;
@@ -834,6 +817,9 @@ static void login_rsp(struct srp_event_struct *evt_struct)
                 return;
         }
 
+        /* If we had any pending I/Os, kick them */
+        scsi_unblock_requests(hostdata->host);
+
         send_mad_adapter_info(hostdata);
         return;
 }
@@ -862,6 +848,7 @@ static int send_srp_login(struct ibmvscsi_host_data *hostdata)
                           init_timeout * HZ);
 
         login = &evt_struct->iu.srp.login_req;
+        memset(login, 0x00, sizeof(struct srp_login_req));
         login->type = SRP_LOGIN_REQ_TYPE;
         login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu);
         login->required_buffer_formats = 0x0006;
@@ -1122,7 +1109,7 @@ static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
  * purge_requests: Our virtual adapter just shut down.  purge any sent requests
  * @hostdata:    the adapter
  */
-static void purge_requests(struct ibmvscsi_host_data *hostdata)
+static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
 {
         struct srp_event_struct *tmp_evt, *pos;
         unsigned long flags;
@@ -1131,7 +1118,7 @@ static void purge_requests(struct ibmvscsi_host_data *hostdata)
         list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
                 list_del(&tmp_evt->list);
                 if (tmp_evt->cmnd) {
-                        tmp_evt->cmnd->result = (DID_ERROR << 16);
+                        tmp_evt->cmnd->result = (error_code << 16);
                         unmap_cmd_data(&tmp_evt->iu.srp.cmd, 
                                        tmp_evt, 
                                        tmp_evt->hostdata->dev);
@@ -1186,12 +1173,30 @@ void ibmvscsi_handle_crq(struct viosrp_crq *crq,
                         printk(KERN_ERR "ibmvscsi: unknown crq message type\n");
                 }
                 return;
-        case 0xFF:              /* Hypervisor telling us the connection is closed */
-                printk(KERN_INFO "ibmvscsi: Virtual adapter failed!\n");
+        case 0xFF:      /* Hypervisor telling us the connection is closed */
+                scsi_block_requests(hostdata->host);
+                if (crq->format == 0x06) {
+                        /* We need to re-setup the interpartition connection */
+                        printk(KERN_INFO
+                               "ibmvscsi: Re-enabling adapter!\n");
+                        purge_requests(hostdata, DID_REQUEUE);
+                        if (ibmvscsi_reenable_crq_queue(&hostdata->queue,
+                                                        hostdata) == 0)
+                                if (ibmvscsi_send_crq(hostdata,
+                                                      0xC001000000000000LL, 0))
+                                        printk(KERN_ERR
+                                               "ibmvscsi: transmit error after"
+                                               " enable\n");
+                } else {
+                        printk(KERN_INFO
+                               "ibmvscsi: Virtual adapter failed rc %d!\n",
+                               crq->format);
 
-                atomic_set(&hostdata->request_limit, -1);
-                purge_requests(hostdata);
-                ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
+                        atomic_set(&hostdata->request_limit, -1);
+                        purge_requests(hostdata, DID_ERROR);
+                        ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
+                }
+                scsi_unblock_requests(hostdata->host);
                 return;
         case 0x80:              /* real payload */
                 break;
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.h b/drivers/scsi/ibmvscsi/ibmvscsi.h
index 5b0edd1f1921..4550d71e4744 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.h
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.h
@@ -103,6 +103,9 @@ void ibmvscsi_release_crq_queue(struct crq_queue *queue,
 int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
                               struct ibmvscsi_host_data *hostdata);
 
+int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
+                                struct ibmvscsi_host_data *hostdata);
+
 void ibmvscsi_handle_crq(struct viosrp_crq *crq,
                          struct ibmvscsi_host_data *hostdata);
 int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
diff --git a/drivers/scsi/ibmvscsi/iseries_vscsi.c b/drivers/scsi/ibmvscsi/iseries_vscsi.c
index ce15d9e39621..7eed0b098171 100644
--- a/drivers/scsi/ibmvscsi/iseries_vscsi.c
+++ b/drivers/scsi/ibmvscsi/iseries_vscsi.c
@@ -124,6 +124,19 @@ int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
 }
 
 /**
+ * reenable_crq_queue: - reenables a crq after a failure
+ * @queue:      crq_queue to initialize and register
+ * @hostdata:   ibmvscsi_host_data of host
+ *
+ * no-op for iSeries
+ */
+int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
+                                struct ibmvscsi_host_data *hostdata)
+{
+        return 0;
+}
+
+/**
  * ibmvscsi_send_crq: - Send a CRQ
  * @hostdata:   the adapter
  * @word1:      the first 64 bits of the data
diff --git a/drivers/scsi/ibmvscsi/rpa_vscsi.c b/drivers/scsi/ibmvscsi/rpa_vscsi.c
index 75db2f5c545e..f47dd87c05e7 100644
--- a/drivers/scsi/ibmvscsi/rpa_vscsi.c
+++ b/drivers/scsi/ibmvscsi/rpa_vscsi.c
@@ -281,6 +281,28 @@ int ibmvscsi_init_crq_queue(struct crq_queue *queue,
 }
 
 /**
+ * reenable_crq_queue: - reenables a crq after
+ * @queue:      crq_queue to initialize and register
+ * @hostdata:   ibmvscsi_host_data of host
+ *
+ */
+int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
+                                 struct ibmvscsi_host_data *hostdata)
+{
+        int rc;
+        struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+
+        /* Re-enable the CRQ */
+        do {
+                rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
+        } while ((rc == H_InProgress) || (rc == H_Busy) || (H_isLongBusy(rc)));
+
+        if (rc)
+                printk(KERN_ERR "ibmvscsi: Error %d enabling adapter\n", rc);
+        return rc;
+}
+
+/**
  * reset_crq_queue: - resets a crq after a failure
  * @queue:      crq_queue to initialize and register
  * @hostdata:   ibmvscsi_host_data of host