[SCSI] mpt fusion: Rescan SAS topology added

1.) SAS topology Rescan is added. If Firmware is doing Reset and we get
Device add interrupt from Firmware, we will not receive it as part of Reset
is going ON. After Reset we will do special Rescan of SAS topology.
2.) Driver version changed from 3.04.08 to 3.04.09.

Added proper lock/unlock in mptsas_not_responding_devices() as per James'
comment.

Signed-off-by: Kashyap Desai <kadesai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 168 insertions, 1 deletions

diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 7f2f76f0db3f..6aa91268afe9 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -119,6 +119,8 @@ static struct mptsas_portinfo	*mptsas_find_portinfo_by_sas_address
 static void mptsas_expander_delete(MPT_ADAPTER *ioc,
 		struct mptsas_portinfo *port_info, u8 force);
 static void mptsas_send_expander_event(struct fw_event_work *fw_event);
+static void mptsas_not_responding_devices(MPT_ADAPTER *ioc);
+static void mptsas_scan_sas_topology(MPT_ADAPTER *ioc);
 
 static void mptsas_print_phy_data(MPT_ADAPTER *ioc,
 					MPI_SAS_IO_UNIT0_PHY_DATA *phy_data)
@@ -844,6 +846,24 @@ mptsas_queue_device_delete(MPT_ADAPTER *ioc,
 	mptsas_add_fw_event(ioc, fw_event, msecs_to_jiffies(1));
 }
 
+static void
+mptsas_queue_rescan(MPT_ADAPTER *ioc)
+{
+	struct fw_event_work *fw_event;
+	int sz;
+
+	sz = offsetof(struct fw_event_work, event_data);
+	fw_event = kzalloc(sz, GFP_ATOMIC);
+	if (!fw_event) {
+		printk(MYIOC_s_WARN_FMT "%s: failed at (line=%d)\n",
+		    ioc->name, __func__, __LINE__);
+		return;
+	}
+	fw_event->event = -1;
+	fw_event->ioc = ioc;
+	mptsas_add_fw_event(ioc, fw_event, msecs_to_jiffies(1));
+}
+
 
 /**
  * mptsas_target_reset
@@ -1100,6 +1120,7 @@ mptsas_ioc_reset(MPT_ADAPTER *ioc, int reset_phase)
 			complete(&ioc->sas_mgmt.done);
 		}
 		mptsas_cleanup_fw_event_q(ioc);
+		mptsas_queue_rescan(ioc);
 		mptsas_fw_event_on(ioc);
 		break;
 	default:
@@ -1406,6 +1427,23 @@ mptsas_firmware_event_work(struct work_struct *work)
 		container_of(work, struct fw_event_work, work.work);
 	MPT_ADAPTER *ioc = fw_event->ioc;
 
+	/* special rescan topology handling */
+	if (fw_event->event == -1) {
+		if (ioc->in_rescan) {
+			devtprintk(ioc, printk(MYIOC_s_DEBUG_FMT
+				"%s: rescan ignored as it is in progress\n",
+				ioc->name, __func__));
+			return;
+		}
+		devtprintk(ioc, printk(MYIOC_s_DEBUG_FMT "%s: rescan after "
+		    "reset\n", ioc->name, __func__));
+		ioc->in_rescan = 1;
+		mptsas_not_responding_devices(ioc);
+		mptsas_scan_sas_topology(ioc);
+		ioc->in_rescan = 0;
+		mptsas_free_fw_event(ioc, fw_event);
+		return;
+	}
 
 	/* events handling turned off during host reset */
 	if (ioc->fw_events_off) {
@@ -3153,8 +3191,15 @@ mptsas_send_link_status_event(struct fw_event_work *fw_event)
 	if (link_rate == MPI_SAS_IOUNIT0_RATE_1_5 ||
 	    link_rate == MPI_SAS_IOUNIT0_RATE_3_0) {
 
-		if (!port_info)
+		if (!port_info) {
+			if (ioc->old_sas_discovery_protocal) {
+				port_info = mptsas_expander_add(ioc,
+					le16_to_cpu(link_data->DevHandle));
+				if (port_info)
+					goto out;
+			}
 			goto out;
+		}
 
 		if (port_info == ioc->hba_port_info)
 			mptsas_probe_hba_phys(ioc);
@@ -3176,6 +3221,121 @@ mptsas_send_link_status_event(struct fw_event_work *fw_event)
 	mptsas_free_fw_event(ioc, fw_event);
 }
 
+static void
+mptsas_not_responding_devices(MPT_ADAPTER *ioc)
+{
+	struct mptsas_portinfo buffer, *port_info;
+	struct mptsas_device_info	*sas_info;
+	struct mptsas_devinfo sas_device;
+	u32	handle;
+	VirtTarget *vtarget = NULL;
+	struct mptsas_phyinfo *phy_info;
+	u8 found_expander;
+	int retval, retry_count;
+	unsigned long flags;
+
+	mpt_findImVolumes(ioc);
+
+	spin_lock_irqsave(&ioc->taskmgmt_lock, flags);
+	if (ioc->ioc_reset_in_progress) {
+		dfailprintk(ioc, printk(MYIOC_s_DEBUG_FMT
+		   "%s: exiting due to a parallel reset \n", ioc->name,
+		    __func__));
+		spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+		return;
+	}
+	spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+
+	/* devices, logical volumes */
+	mutex_lock(&ioc->sas_device_info_mutex);
+ redo_device_scan:
+	list_for_each_entry(sas_info, &ioc->sas_device_info_list, list) {
+		sas_device.handle = 0;
+		retry_count = 0;
+retry_page:
+		retval = mptsas_sas_device_pg0(ioc, &sas_device,
+				(MPI_SAS_DEVICE_PGAD_FORM_BUS_TARGET_ID
+				<< MPI_SAS_DEVICE_PGAD_FORM_SHIFT),
+				(sas_info->fw.channel << 8) +
+				sas_info->fw.id);
+
+		if (sas_device.handle)
+			continue;
+		if (retval == -EBUSY) {
+			spin_lock_irqsave(&ioc->taskmgmt_lock, flags);
+			if (ioc->ioc_reset_in_progress) {
+				dfailprintk(ioc,
+				    printk(MYIOC_s_DEBUG_FMT
+				    "%s: exiting due to reset\n",
+				    ioc->name, __func__));
+				spin_unlock_irqrestore
+				    (&ioc->taskmgmt_lock, flags);
+				mutex_unlock(&ioc->sas_device_info_mutex);
+				return;
+			}
+			spin_unlock_irqrestore(&ioc->taskmgmt_lock,
+			flags);
+		}
+
+		if (retval && (retval != -ENODEV)) {
+			if (retry_count < 10) {
+				retry_count++;
+				goto retry_page;
+			} else {
+				devtprintk(ioc, printk(MYIOC_s_DEBUG_FMT
+				"%s: Config page retry exceeded retry "
+				"count deleting device 0x%llx\n",
+				ioc->name, __func__,
+				sas_info->sas_address));
+			}
+		}
+
+		/* delete device */
+		vtarget = mptsas_find_vtarget(ioc,
+				sas_info->fw.channel, sas_info->fw.id);
+		if (vtarget)
+			vtarget->deleted = 1;
+		phy_info = mptsas_find_phyinfo_by_sas_address(ioc,
+		    sas_info->sas_address);
+		if (phy_info) {
+			mptsas_del_end_device(ioc, phy_info);
+			goto redo_device_scan;
+		}
+	}
+	mutex_unlock(&ioc->sas_device_info_mutex);
+
+	/* expanders */
+	mutex_lock(&ioc->sas_topology_mutex);
+ redo_expander_scan:
+	list_for_each_entry(port_info, &ioc->sas_topology, list) {
+
+		if (port_info->phy_info &&
+		    (!(port_info->phy_info[0].identify.device_info &
+		    MPI_SAS_DEVICE_INFO_SMP_TARGET)))
+			continue;
+		found_expander = 0;
+		handle = 0xFFFF;
+		while (!mptsas_sas_expander_pg0(ioc, &buffer,
+		    (MPI_SAS_EXPAND_PGAD_FORM_GET_NEXT_HANDLE <<
+		     MPI_SAS_EXPAND_PGAD_FORM_SHIFT), handle) &&
+		    !found_expander) {
+
+			handle = buffer.phy_info[0].handle;
+			if (buffer.phy_info[0].identify.sas_address ==
+			    port_info->phy_info[0].identify.sas_address) {
+				found_expander = 1;
+			}
+			kfree(buffer.phy_info);
+		}
+
+		if (!found_expander) {
+			mptsas_expander_delete(ioc, port_info, 0);
+			goto redo_expander_scan;
+		}
+	}
+	mutex_lock(&ioc->sas_topology_mutex);
+}
+
 /**
  *	mptsas_probe_expanders - adding expanders
  *	@ioc: Pointer to MPT_ADAPTER structure
@@ -3895,6 +4055,8 @@ mptsas_event_process(MPT_ADAPTER *ioc, EventNotificationReply_t *reply)
 		MpiEventDataSasExpanderStatusChange_t *expander_data =
 		    (MpiEventDataSasExpanderStatusChange_t *)reply->Data;
 
+		if (ioc->old_sas_discovery_protocal)
+			return 0;
 
 		if (expander_data->ReasonCode ==
 		    MPI_EVENT_SAS_EXP_RC_NOT_RESPONDING &&
@@ -3910,6 +4072,8 @@ mptsas_event_process(MPT_ADAPTER *ioc, EventNotificationReply_t *reply)
 
 		discovery_status = le32_to_cpu(discovery_data->DiscoveryStatus);
 		ioc->sas_discovery_quiesce_io = discovery_status ? 1 : 0;
+		if (ioc->old_sas_discovery_protocal && !discovery_status)
+			mptsas_queue_rescan(ioc);
 		return 0;
 	}
 	case MPI_EVENT_INTEGRATED_RAID:
@@ -4117,6 +4281,9 @@ mptsas_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto out_mptsas_probe;
 	}
 
+	/* older firmware doesn't support expander events */
+	if ((ioc->facts.HeaderVersion >> 8) < 0xE)
+		ioc->old_sas_discovery_protocal = 1;
 	mptsas_scan_sas_topology(ioc);
 	mptsas_fw_event_on(ioc);
 	return 0;