[SCSI] qla2xxx: Add FC-transport Asynchronous Event Notification support.
Supported events include LIP, LIP reset, RSCN, link up, and link
down.
To support AEN (and additional forthcoming features), we also
introduce a simple deferred-work construct to manage events which
require a non-atomic sleeping-capable context. This work-list is
processed as part of the driver's standard DPC routine.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 661a159..eb770675 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -1704,6 +1704,7 @@
INIT_LIST_HEAD(&ha->list);
INIT_LIST_HEAD(&ha->fcports);
INIT_LIST_HEAD(&ha->vp_list);
+ INIT_LIST_HEAD(&ha->work_list);
set_bit(0, (unsigned long *) ha->vp_idx_map);
@@ -2197,6 +2198,76 @@
kfree(ha->nvram);
}
+struct qla_work_evt *
+qla2x00_alloc_work(struct scsi_qla_host *ha, enum qla_work_type type,
+ int locked)
+{
+ struct qla_work_evt *e;
+
+ e = kzalloc(sizeof(struct qla_work_evt), locked ? GFP_ATOMIC:
+ GFP_KERNEL);
+ if (!e)
+ return NULL;
+
+ INIT_LIST_HEAD(&e->list);
+ e->type = type;
+ e->flags = QLA_EVT_FLAG_FREE;
+ return e;
+}
+
+int
+qla2x00_post_work(struct scsi_qla_host *ha, struct qla_work_evt *e, int locked)
+{
+ unsigned long flags;
+
+ if (!locked)
+ spin_lock_irqsave(&ha->hardware_lock, flags);
+ list_add_tail(&e->list, &ha->work_list);
+ qla2xxx_wake_dpc(ha);
+ if (!locked)
+ spin_unlock_irqrestore(&ha->hardware_lock, flags);
+ return QLA_SUCCESS;
+}
+
+int
+qla2x00_post_aen_work(struct scsi_qla_host *ha, enum fc_host_event_code code,
+ u32 data)
+{
+ struct qla_work_evt *e;
+
+ e = qla2x00_alloc_work(ha, QLA_EVT_AEN, 1);
+ if (!e)
+ return QLA_FUNCTION_FAILED;
+
+ e->u.aen.code = code;
+ e->u.aen.data = data;
+ return qla2x00_post_work(ha, e, 1);
+}
+
+static void
+qla2x00_do_work(struct scsi_qla_host *ha)
+{
+ struct qla_work_evt *e;
+
+ spin_lock_irq(&ha->hardware_lock);
+ while (!list_empty(&ha->work_list)) {
+ e = list_entry(ha->work_list.next, struct qla_work_evt, list);
+ list_del_init(&e->list);
+ spin_unlock_irq(&ha->hardware_lock);
+
+ switch (e->type) {
+ case QLA_EVT_AEN:
+ fc_host_post_event(ha->host, fc_get_event_number(),
+ e->u.aen.code, e->u.aen.data);
+ break;
+ }
+ if (e->flags & QLA_EVT_FLAG_FREE)
+ kfree(e);
+ spin_lock_irq(&ha->hardware_lock);
+ }
+ spin_unlock_irq(&ha->hardware_lock);
+}
+
/**************************************************************************
* qla2x00_do_dpc
* This kernel thread is a task that is schedule by the interrupt handler
@@ -2248,6 +2319,8 @@
continue;
}
+ qla2x00_do_work(ha);
+
if (test_and_clear_bit(ISP_ABORT_NEEDED, &ha->dpc_flags)) {
DEBUG(printk("scsi(%ld): dpc: sched "