[SCSI] qla4xxx: added support for host event

Added support to post kernel host event to application using
netlink interface.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h
index ec48dc3..f91808c 100644 (file)
--- a/drivers/scsi/qla4xxx/ql4_def.h
+++ b/drivers/scsi/qla4xxx/ql4_def.h
@@ -301,7 +301,21 @@ struct ql4_tuple_ddb {
 #define DF_ISNS_DISCOVERED     2       /* Device was discovered via iSNS */
 #define DF_FO_MASKED           3
 
+enum qla4_work_type {
+       QLA4_EVENT_AEN,
+};
 
+struct qla4_work_evt {
+       struct list_head list;
+       enum qla4_work_type type;
+       union {
+               struct {
+                       enum iscsi_host_event_code code;
+                       uint32_t data_size;
+                       uint8_t data[0];
+               } aen;
+       } u;
+};
 
 struct ql82xx_hw_data {
        /* Offsets for flash/nvram access (set to ~0 if not used). */
@@ -672,6 +686,10 @@ struct scsi_qla_host {
        uint16_t sec_ddb_idx;
        int is_reset;
        uint16_t temperature;
+
+       /* event work list */
+       struct list_head work_list;
+       spinlock_t work_lock;
 };
 
 struct ql4_task_data {

diff --git a/drivers/scsi/qla4xxx/ql4_glbl.h b/drivers/scsi/qla4xxx/ql4_glbl.h
index d0dd4b3..34cf851 100644 (file)
--- a/drivers/scsi/qla4xxx/ql4_glbl.h
+++ b/drivers/scsi/qla4xxx/ql4_glbl.h
@@ -181,6 +181,8 @@ int qla4xxx_flash_ddb_change(struct scsi_qla_host *ha, uint32_t fw_ddb_index,
 int qla4xxx_ddb_change(struct scsi_qla_host *ha, uint32_t fw_ddb_index,
                       struct ddb_entry *ddb_entry, uint32_t state);
 void qla4xxx_build_ddb_list(struct scsi_qla_host *ha, int is_reset);
+int qla4xxx_post_aen_work(struct scsi_qla_host *ha, uint32_t aen_code,
+                         uint32_t data_size, uint8_t *data);
 
 /* BSG Functions */
 int qla4xxx_bsg_request(struct bsg_job *bsg_job);

diff --git a/drivers/scsi/qla4xxx/ql4_isr.c b/drivers/scsi/qla4xxx/ql4_isr.c
index 9582886..954fe84 100644 (file)
--- a/drivers/scsi/qla4xxx/ql4_isr.c
+++ b/drivers/scsi/qla4xxx/ql4_isr.c
@@ -576,6 +576,9 @@ static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
                                set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 
                        ql4_printk(KERN_INFO, ha, "%s: LINK UP\n", __func__);
+                       qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKUP,
+                                             sizeof(mbox_sts),
+                                             (uint8_t *) mbox_sts);
                        break;
 
                case MBOX_ASTS_LINK_DOWN:
@@ -584,6 +587,9 @@ static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
                                set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 
                        ql4_printk(KERN_INFO, ha, "%s: LINK DOWN\n", __func__);
+                       qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKDOWN,
+                                             sizeof(mbox_sts),
+                                             (uint8_t *) mbox_sts);
                        break;
 
                case MBOX_ASTS_HEARTBEAT:

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 2cd2077..d423f7a 100644 (file)
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -2282,6 +2282,10 @@ static void qla4xxx_timer(struct scsi_qla_host *ha)
                }
        }
 
+       /* Process any deferred work. */
+       if (!list_empty(&ha->work_list))
+               start_dpc++;
+
        /* Wakeup the dpc routine for this adapter, if needed. */
        if (start_dpc ||
             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
@@ -2847,6 +2851,81 @@ void qla4xxx_wake_dpc(struct scsi_qla_host *ha)
                queue_work(ha->dpc_thread, &ha->dpc_work);
 }
 
+static struct qla4_work_evt *
+qla4xxx_alloc_work(struct scsi_qla_host *ha, uint32_t data_size,
+                  enum qla4_work_type type)
+{
+       struct qla4_work_evt *e;
+       uint32_t size = sizeof(struct qla4_work_evt) + data_size;
+
+       e = kzalloc(size, GFP_ATOMIC);
+       if (!e)
+               return NULL;
+
+       INIT_LIST_HEAD(&e->list);
+       e->type = type;
+       return e;
+}
+
+static void qla4xxx_post_work(struct scsi_qla_host *ha,
+                            struct qla4_work_evt *e)
+{
+       unsigned long flags;
+
+       spin_lock_irqsave(&ha->work_lock, flags);
+       list_add_tail(&e->list, &ha->work_list);
+       spin_unlock_irqrestore(&ha->work_lock, flags);
+       qla4xxx_wake_dpc(ha);
+}
+
+int qla4xxx_post_aen_work(struct scsi_qla_host *ha,
+                         enum iscsi_host_event_code aen_code,
+                         uint32_t data_size, uint8_t *data)
+{
+       struct qla4_work_evt *e;
+
+       e = qla4xxx_alloc_work(ha, data_size, QLA4_EVENT_AEN);
+       if (!e)
+               return QLA_ERROR;
+
+       e->u.aen.code = aen_code;
+       e->u.aen.data_size = data_size;
+       memcpy(e->u.aen.data, data, data_size);
+
+       qla4xxx_post_work(ha, e);
+
+       return QLA_SUCCESS;
+}
+
+void qla4xxx_do_work(struct scsi_qla_host *ha)
+{
+       struct qla4_work_evt *e, *tmp;
+       unsigned long flags;
+       LIST_HEAD(work);
+
+       spin_lock_irqsave(&ha->work_lock, flags);
+       list_splice_init(&ha->work_list, &work);
+       spin_unlock_irqrestore(&ha->work_lock, flags);
+
+       list_for_each_entry_safe(e, tmp, &work, list) {
+               list_del_init(&e->list);
+
+               switch (e->type) {
+               case QLA4_EVENT_AEN:
+                       iscsi_post_host_event(ha->host_no,
+                                             &qla4xxx_iscsi_transport,
+                                             e->u.aen.code,
+                                             e->u.aen.data_size,
+                                             e->u.aen.data);
+                       break;
+               default:
+                       ql4_printk(KERN_WARNING, ha, "event type: 0x%x not "
+                                  "supported", e->type);
+               }
+               kfree(e);
+       }
+}
+
 /**
  * qla4xxx_do_dpc - dpc routine
  * @data: in our case pointer to adapter structure
@@ -2878,6 +2957,9 @@ static void qla4xxx_do_dpc(struct work_struct *work)
                return;
        }
 
+       /* post events to application */
+       qla4xxx_do_work(ha);
+
        if (is_qla8022(ha)) {
                if (test_bit(DPC_HA_UNRECOVERABLE, &ha->dpc_flags)) {
                        qla4_8xxx_idc_lock(ha);
@@ -4450,6 +4532,9 @@ static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
 
        spin_lock_init(&ha->hardware_lock);
 
+       /* Initialize work list */
+       INIT_LIST_HEAD(&ha->work_list);
+
        /* Allocate dma buffers */
        if (qla4xxx_mem_alloc(ha)) {
                ql4_printk(KERN_WARNING, ha,