X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=drivers%2Fscsi%2Fibmvscsi%2Fibmvfc.c;h=ea4abee7a2a95e8d783da6b7f82da2bc7f39aab8;hp=93d1fbe4ee5d2a3ef40eea6458e6f2cc8e3a0c44;hb=44d84afa834b799560d7dbe47250ad7557f5ca2f;hpb=c4e1aa67ed9e4e542a064bc271ddbf152b677e91

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 93d1fbe4ee5d..ea4abee7a2a9 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -75,7 +75,7 @@ MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
 module_param_named(max_targets, max_targets, uint, S_IRUGO);
 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
 		 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
-module_param_named(disc_threads, disc_threads, uint, S_IRUGO | S_IWUSR);
+module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
 		 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
@@ -640,6 +640,7 @@ static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 
 	ibmvfc_dbg(vhost, "Releasing CRQ\n");
 	free_irq(vdev->irq, vhost);
+	tasklet_kill(&vhost->tasklet);
 	do {
 		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
@@ -2699,6 +2700,25 @@ static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
 {
 	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
+	unsigned long flags;
+
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	vio_disable_interrupts(to_vio_dev(vhost->dev));
+	tasklet_schedule(&vhost->tasklet);
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+	return IRQ_HANDLED;
+}
+
+/**
+ * ibmvfc_tasklet - Interrupt handler tasklet
+ * @data:		ibmvfc host struct
+ *
+ * Returns:
+ *	Nothing
+ **/
+static void ibmvfc_tasklet(void *data)
+{
+	struct ibmvfc_host *vhost = data;
 	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 	struct ibmvfc_crq *crq;
 	struct ibmvfc_async_crq *async;
@@ -2706,7 +2726,6 @@ static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
 	int done = 0;
 
 	spin_lock_irqsave(vhost->host->host_lock, flags);
-	vio_disable_interrupts(to_vio_dev(vhost->dev));
 	while (!done) {
 		/* Pull all the valid messages off the CRQ */
 		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
@@ -2734,7 +2753,6 @@ static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
 	}
 
 	spin_unlock_irqrestore(vhost->host->host_lock, flags);
-	return IRQ_HANDLED;
 }
 
 /**
@@ -3105,6 +3123,7 @@ static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
 
 	vhost->discovery_threads--;
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+	del_timer(&tgt->timer);
 
 	switch (status) {
 	case IBMVFC_MAD_SUCCESS:
@@ -3160,10 +3179,90 @@ static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
 	mad->iu.rsp.len = sizeof(mad->fc_iu.response);
 }
 
+/**
+ * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
+ * @evt:		ibmvfc event struct
+ *
+ * Just cleanup this event struct. Everything else is handled by
+ * the ADISC completion handler. If the ADISC never actually comes
+ * back, we still have the timer running on the ADISC event struct
+ * which will fire and cause the CRQ to get reset.
+ *
+ **/
+static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_target *tgt = evt->tgt;
+
+	tgt_dbg(tgt, "ADISC cancel complete\n");
+	vhost->abort_threads--;
+	ibmvfc_free_event(evt);
+	kref_put(&tgt->kref, ibmvfc_release_tgt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_adisc_timeout - Handle an ADISC timeout
+ * @tgt:		ibmvfc target struct
+ *
+ * If an ADISC times out, send a cancel. If the cancel times
+ * out, reset the CRQ. When the ADISC comes back as cancelled,
+ * log back into the target.
+ **/
+static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct ibmvfc_event *evt;
+	struct ibmvfc_tmf *tmf;
+	unsigned long flags;
+	int rc;
+
+	tgt_dbg(tgt, "ADISC timeout\n");
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	if (vhost->abort_threads >= disc_threads ||
+	    tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
+	    vhost->state != IBMVFC_INITIALIZING ||
+	    vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		return;
+	}
+
+	vhost->abort_threads++;
+	kref_get(&tgt->kref);
+	evt = ibmvfc_get_event(vhost);
+	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
+
+	evt->tgt = tgt;
+	tmf = &evt->iu.tmf;
+	memset(tmf, 0, sizeof(*tmf));
+	tmf->common.version = 1;
+	tmf->common.opcode = IBMVFC_TMF_MAD;
+	tmf->common.length = sizeof(*tmf);
+	tmf->scsi_id = tgt->scsi_id;
+	tmf->cancel_key = tgt->cancel_key;
+
+	rc = ibmvfc_send_event(evt, vhost, default_timeout);
+
+	if (rc) {
+		tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
+		vhost->abort_threads--;
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+		__ibmvfc_reset_host(vhost);
+	} else
+		tgt_dbg(tgt, "Attempting to cancel ADISC\n");
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
 /**
  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
  * @tgt:		ibmvfc target struct
  *
+ * When sending an ADISC we end up with two timers running. The
+ * first timer is the timer in the ibmvfc target struct. If this
+ * fires, we send a cancel to the target. The second timer is the
+ * timer on the ibmvfc event for the ADISC, which is longer. If that
+ * fires, it means the ADISC timed out and our attempt to cancel it
+ * also failed, so we need to reset the CRQ.
  **/
 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 {
@@ -3184,6 +3283,7 @@ static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 	mad = &evt->iu.passthru;
 	mad->iu.flags = IBMVFC_FC_ELS;
 	mad->iu.scsi_id = tgt->scsi_id;
+	mad->iu.cancel_key = tgt->cancel_key;
 
 	mad->fc_iu.payload[0] = IBMVFC_ADISC;
 	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
@@ -3192,9 +3292,19 @@ static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 	       sizeof(vhost->login_buf->resp.node_name));
 	mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
 
+	if (timer_pending(&tgt->timer))
+		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
+	else {
+		tgt->timer.data = (unsigned long) tgt;
+		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
+		tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
+		add_timer(&tgt->timer);
+	}
+
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
-	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
 		vhost->discovery_threads--;
+		del_timer(&tgt->timer);
 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
 		kref_put(&tgt->kref, ibmvfc_release_tgt);
 	} else
@@ -3322,6 +3432,8 @@ static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
 	tgt->new_scsi_id = scsi_id;
 	tgt->vhost = vhost;
 	tgt->need_login = 1;
+	tgt->cancel_key = vhost->task_set++;
+	init_timer(&tgt->timer);
 	kref_init(&tgt->kref);
 	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
 	spin_lock_irqsave(vhost->host->host_lock, flags);
@@ -3716,6 +3828,7 @@ static void ibmvfc_do_work(struct ibmvfc_host *vhost)
 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
 				if (rport)
 					fc_remote_port_delete(rport);
+				del_timer_sync(&tgt->timer);
 				kref_put(&tgt->kref, ibmvfc_release_tgt);
 				return;
 			}
@@ -3859,6 +3972,8 @@ static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
 
 	retrc = 0;
 
+	tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
+
 	if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
 		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
 		goto req_irq_failed;
@@ -3874,6 +3989,7 @@ static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
 	return retrc;
 
 req_irq_failed:
+	tasklet_kill(&vhost->tasklet);
 	do {
 		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
@@ -4040,6 +4156,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	vhost->dev = dev;
 	vhost->partition_number = -1;
 	vhost->log_level = log_level;
+	vhost->task_set = 1;
 	strcpy(vhost->partition_name, "UNKNOWN");
 	init_waitqueue_head(&vhost->work_wait_q);
 	init_waitqueue_head(&vhost->init_wait_q);
@@ -4174,6 +4291,7 @@ static struct fc_function_template ibmvfc_transport_functions = {
 	.show_host_supported_classes = 1,
 	.show_host_port_type = 1,
 	.show_host_port_id = 1,
+	.show_host_maxframe_size = 1,
 
 	.get_host_port_state = ibmvfc_get_host_port_state,
 	.show_host_port_state = 1,