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);
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));
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;
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) {
}
spin_unlock_irqrestore(vhost->host->host_lock, flags);
- return IRQ_HANDLED;
}
/**
vhost->discovery_threads--;
ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+ del_timer(&tgt->timer);
switch (status) {
case IBMVFC_MAD_SUCCESS:
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)
{
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,
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
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);
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;
}
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;
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));
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);
.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,
git.openpandora.org / pandora-kernel.git / blobdiff