[SCSI] mpt2sas: Redesign Raid devices event handling using pd_handles per HBA

Actual problem :
Driver  may receiving the top level expander
removal event prior to all the individual PD removal events, hence the
driver is breaking down all the PDs in advanced to the actaul PD UNHIDE
event. Driver sends multiple
Target Resets to the same volume handle for each individual PD removal.

FIX DESCRIPTION:
To fix this issue, the entire PD device handshake protocal has to be
moved to interrupt context so the breakdown occurs immediately after the
actual UNHIDE event arrives.  The driver will only issue one Target Reset to
the volume handle, occurring after the FAILED or MISSING volume status
event arrives from interrupt context. For the PD UNHIDE event, the driver
will issue target resets to the PD handles, followed by OP_REMOVE.  The
driver will set the "deteleted" flag during interrupt context.  A "pd_handle"
bitmask was introduced so the driver has a list of known pds during entire
life of the PD; this replaces the "hidden_raid_component" flag handle in
the sas_device object.  Each bit in the bitmask represents a device handle.
The bit in the bitmask would be toggled ON/OFF when the HIDE/UNHIDE
events arrive; also this pd_handle bitmask would bould be refreshed
across host resets.

Here we kept older behavior of sending target reset to volume when there is
a single drive pull, wait for the reply, then send target resets
to the PDs.  We kept this behavior so the driver will
behave the same for older versions of firmware.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

3 files changed, 391 insertions, 103 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 3774b0742b2..bb8acf78169 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -3468,6 +3468,12 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
 		kfree(delayed_tr);
 	}
 
+	list_for_each_entry_safe(delayed_tr, delayed_tr_next,
+	    &ioc->delayed_tr_volume_list, list) {
+		list_del(&delayed_tr->list);
+		kfree(delayed_tr);
+	}
+
 	/* initialize the scsi lookup free list */
 	spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
 	INIT_LIST_HEAD(&ioc->free_list);
@@ -3622,6 +3628,15 @@ mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
 
 	init_waitqueue_head(&ioc->reset_wq);
 
+	/* allocate memory pd handle bitmask list */
+	ioc->pd_handles_sz = (ioc->facts.MaxDevHandle / 8);
+	if (ioc->facts.MaxDevHandle % 8)
+		ioc->pd_handles_sz++;
+	ioc->pd_handles = kzalloc(ioc->pd_handles_sz,
+	    GFP_KERNEL);
+	if (!ioc->pd_handles)
+		goto out_free_resources;
+
 	ioc->fwfault_debug = mpt2sas_fwfault_debug;
 
 	/* base internal command bits */
@@ -3691,6 +3706,7 @@ mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
 	mpt2sas_base_free_resources(ioc);
 	_base_release_memory_pools(ioc);
 	pci_set_drvdata(ioc->pdev, NULL);
+	kfree(ioc->pd_handles);
 	kfree(ioc->tm_cmds.reply);
 	kfree(ioc->transport_cmds.reply);
 	kfree(ioc->scsih_cmds.reply);
@@ -3726,6 +3742,7 @@ mpt2sas_base_detach(struct MPT2SAS_ADAPTER *ioc)
 	mpt2sas_base_free_resources(ioc);
 	_base_release_memory_pools(ioc);
 	pci_set_drvdata(ioc->pdev, NULL);
+	kfree(ioc->pd_handles);
 	kfree(ioc->pfacts);
 	kfree(ioc->ctl_cmds.reply);
 	kfree(ioc->base_cmds.reply);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index e2c5cee6450..6fdee1680a6 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -276,7 +276,6 @@ struct _internal_cmd {
  * @channel: target channel
  * @slot: number number
  * @phy: phy identifier provided in sas device page 0
- * @hidden_raid_component: set to 1 when this is a raid member
  * @responding: used in _scsih_sas_device_mark_responding
  */
 struct _sas_device {
@@ -295,7 +294,6 @@ struct _sas_device {
 	int	channel;
 	u16	slot;
 	u8	phy;
-	u8	hidden_raid_component;
 	u8	responding;
 };
 
@@ -489,6 +487,8 @@ typedef void (*MPT_ADD_SGE)(void *paddr, u32 flags_length, dma_addr_t dma_addr);
  * @ctl_cb_idx: clt internal commands
  * @base_cb_idx: base internal commands
  * @config_cb_idx: base internal commands
+ * @tm_tr_cb_idx : device removal target reset handshake
+ * @tm_tr_volume_cb_idx : volume removal target reset
  * @base_cmds:
  * @transport_cmds:
  * @scsih_cmds:
@@ -517,6 +517,9 @@ typedef void (*MPT_ADD_SGE)(void *paddr, u32 flags_length, dma_addr_t dma_addr);
  * @sas_device_lock:
  * @io_missing_delay: time for IO completed by fw when PDR enabled
  * @device_missing_delay: time for device missing by fw when PDR enabled
+ * @sas_id : used for setting volume target IDs
+ * @pd_handles : bitmask for PD handles
+ * @pd_handles_sz : size of pd_handle bitmask
  * @config_page_sz: config page size
  * @config_page: reserve memory for config page payload
  * @config_page_dma:
@@ -569,6 +572,8 @@ typedef void (*MPT_ADD_SGE)(void *paddr, u32 flags_length, dma_addr_t dma_addr);
  * @reply_post_free_dma:
  * @reply_post_free_dma_pool:
  * @reply_post_host_index: head index in the pool where FW completes IO
+ * @delayed_tr_list: target reset link list
+ * @delayed_tr_volume_list: volume target reset link list
  */
 struct MPT2SAS_ADAPTER {
 	struct list_head list;
@@ -627,6 +632,7 @@ struct MPT2SAS_ADAPTER {
 	u8		base_cb_idx;
 	u8		config_cb_idx;
 	u8		tm_tr_cb_idx;
+	u8		tm_tr_volume_cb_idx;
 	u8		tm_sas_control_cb_idx;
 	struct _internal_cmd base_cmds;
 	struct _internal_cmd transport_cmds;
@@ -670,6 +676,9 @@ struct MPT2SAS_ADAPTER {
 	u16		device_missing_delay;
 	int		sas_id;
 
+	void		*pd_handles;
+	u16		pd_handles_sz;
+
 	/* config page */
 	u16		config_page_sz;
 	void 		*config_page;
@@ -741,6 +750,7 @@ struct MPT2SAS_ADAPTER {
 	u32		reply_post_host_index;
 
 	struct list_head delayed_tr_list;
+	struct list_head delayed_tr_volume_list;
 
 	/* diag buffer support */
 	u8		*diag_buffer[MPI2_DIAG_BUF_TYPE_COUNT];
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index db12e184d1d..b327d60fad1 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -70,6 +70,8 @@ static void _scsih_expander_node_remove(struct MPT2SAS_ADAPTER *ioc,
     struct _sas_node *sas_expander);
 static void _firmware_event_work(struct work_struct *work);
 
+static u8 _scsih_check_for_pending_tm(struct MPT2SAS_ADAPTER *ioc, u16 smid);
+
 /* global parameters */
 LIST_HEAD(mpt2sas_ioc_list);
 
@@ -84,6 +86,7 @@ static u8 config_cb_idx = -1;
 static int mpt_ids;
 
 static u8 tm_tr_cb_idx = -1 ;
+static u8 tm_tr_volume_cb_idx = -1 ;
 static u8 tm_sas_control_cb_idx = -1;
 
 /* command line options */
@@ -1226,7 +1229,7 @@ _scsih_target_alloc(struct scsi_target *starget)
 		sas_device->starget = starget;
 		sas_device->id = starget->id;
 		sas_device->channel = starget->channel;
-		if (sas_device->hidden_raid_component)
+		if (test_bit(sas_device->handle, ioc->pd_handles))
 			sas_target_priv_data->flags |=
 			    MPT_TARGET_FLAGS_RAID_COMPONENT;
 	}
@@ -2583,6 +2586,7 @@ _scsih_tm_tr_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
 	Mpi2SCSITaskManagementRequest_t *mpi_request;
 	u16 smid;
 	struct _sas_device *sas_device;
+	struct MPT2SAS_TARGET *sas_target_priv_data;
 	unsigned long flags;
 	struct _tr_list *delayed_tr;
 
@@ -2592,11 +2596,20 @@ _scsih_tm_tr_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
 		return;
 	}
 
+	/* if PD, then return */
+	if (test_bit(handle, ioc->pd_handles))
+		return;
+
 	spin_lock_irqsave(&ioc->sas_device_lock, flags);
 	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
-	if (sas_device && sas_device->hidden_raid_component) {
-		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
-		return;
+	if (sas_device && sas_device->starget &&
+	     sas_device->starget->hostdata) {
+		sas_target_priv_data = sas_device->starget->hostdata;
+		sas_target_priv_data->deleted = 1;
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
+		    "setting delete flag: handle(0x%04x), "
+		    "sas_addr(0x%016llx)\n", ioc->name, handle,
+		    (unsigned long long) sas_device->sas_address));
 	}
 	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
 
@@ -2659,6 +2672,99 @@ _scsih_sas_control_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid,
 }
 
 /**
+ * _scsih_tm_tr_volume_send - send target reset request for volumes
+ * @ioc: per adapter object
+ * @handle: device handle
+ * Context: interrupt time.
+ *
+ * This is designed to send muliple task management request at the same
+ * time to the fifo. If the fifo is full, we will append the request,
+ * and process it in a future completion.
+ */
+static void
+_scsih_tm_tr_volume_send(struct MPT2SAS_ADAPTER *ioc, u16 handle)
+{
+	Mpi2SCSITaskManagementRequest_t *mpi_request;
+	u16 smid;
+	struct _tr_list *delayed_tr;
+
+	if (ioc->shost_recovery || ioc->remove_host) {
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host reset in "
+		   "progress!\n", __func__, ioc->name));
+		return;
+	}
+
+	smid = mpt2sas_base_get_smid_hpr(ioc, ioc->tm_tr_volume_cb_idx);
+	if (!smid) {
+		delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
+		if (!delayed_tr)
+			return;
+		INIT_LIST_HEAD(&delayed_tr->list);
+		delayed_tr->handle = handle;
+		list_add_tail(&delayed_tr->list, &ioc->delayed_tr_volume_list);
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
+		    "DELAYED:tr:handle(0x%04x), (open)\n",
+		    ioc->name, handle));
+		return;
+	}
+
+	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "tr_send:handle(0x%04x), "
+	    "(open), smid(%d), cb(%d)\n", ioc->name, handle, smid,
+	    ioc->tm_tr_volume_cb_idx));
+	mpi_request = mpt2sas_base_get_msg_frame(ioc, smid);
+	memset(mpi_request, 0, sizeof(Mpi2SCSITaskManagementRequest_t));
+	mpi_request->Function = MPI2_FUNCTION_SCSI_TASK_MGMT;
+	mpi_request->DevHandle = cpu_to_le16(handle);
+	mpi_request->TaskType = MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET;
+	mpt2sas_base_put_smid_hi_priority(ioc, smid);
+}
+
+/**
+ * _scsih_tm_volume_tr_complete - target reset completion
+ * @ioc: per adapter object
+ * @smid: system request message index
+ * @msix_index: MSIX table index supplied by the OS
+ * @reply: reply message frame(lower 32bit addr)
+ * Context: interrupt time.
+ *
+ * Return 1 meaning mf should be freed from _base_interrupt
+ *        0 means the mf is freed from this function.
+ */
+static u8
+_scsih_tm_volume_tr_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid,
+    u8 msix_index, u32 reply)
+{
+	u16 handle;
+	Mpi2SCSITaskManagementRequest_t *mpi_request_tm;
+	Mpi2SCSITaskManagementReply_t *mpi_reply =
+	    mpt2sas_base_get_reply_virt_addr(ioc, reply);
+
+	if (ioc->shost_recovery || ioc->remove_host) {
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host reset in "
+		   "progress!\n", __func__, ioc->name));
+		return 1;
+	}
+
+	mpi_request_tm = mpt2sas_base_get_msg_frame(ioc, smid);
+	handle = le16_to_cpu(mpi_request_tm->DevHandle);
+	if (handle != le16_to_cpu(mpi_reply->DevHandle)) {
+		dewtprintk(ioc, printk("spurious interrupt: "
+		    "handle(0x%04x:0x%04x), smid(%d)!!!\n", handle,
+		    le16_to_cpu(mpi_reply->DevHandle), smid));
+		return 0;
+	}
+
+	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
+	    "tr_complete:handle(0x%04x), (open) smid(%d), ioc_status(0x%04x), "
+	    "loginfo(0x%08x), completed(%d)\n", ioc->name,
+	    handle, smid, le16_to_cpu(mpi_reply->IOCStatus),
+	    le32_to_cpu(mpi_reply->IOCLogInfo),
+	    le32_to_cpu(mpi_reply->TerminationCount)));
+
+	return _scsih_check_for_pending_tm(ioc, smid);
+}
+
+/**
  * _scsih_tm_tr_complete -
  * @ioc: per adapter object
  * @smid: system request message index
@@ -2684,7 +2790,6 @@ _scsih_tm_tr_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 	    mpt2sas_base_get_reply_virt_addr(ioc, reply);
 	Mpi2SasIoUnitControlRequest_t *mpi_request;
 	u16 smid_sas_ctrl;
-	struct _tr_list *delayed_tr;
 
 	if (ioc->shost_recovery || ioc->remove_host) {
 		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: host reset in "
@@ -2725,6 +2830,35 @@ _scsih_tm_tr_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 	mpi_request->DevHandle = mpi_request_tm->DevHandle;
 	mpt2sas_base_put_smid_default(ioc, smid_sas_ctrl);
 
+	return _scsih_check_for_pending_tm(ioc, smid);
+}
+
+/**
+ * _scsih_check_for_pending_tm - check for pending task management
+ * @ioc: per adapter object
+ * @smid: system request message index
+ *
+ * This will check delayed target reset list, and feed the
+ * next reqeust.
+ *
+ * Return 1 meaning mf should be freed from _base_interrupt
+ *        0 means the mf is freed from this function.
+ */
+static u8
+_scsih_check_for_pending_tm(struct MPT2SAS_ADAPTER *ioc, u16 smid)
+{
+	struct _tr_list *delayed_tr;
+
+	if (!list_empty(&ioc->delayed_tr_volume_list)) {
+		delayed_tr = list_entry(ioc->delayed_tr_volume_list.next,
+		    struct _tr_list, list);
+		mpt2sas_base_free_smid(ioc, smid);
+		_scsih_tm_tr_volume_send(ioc, delayed_tr->handle);
+		list_del(&delayed_tr->list);
+		kfree(delayed_tr);
+		return 0;
+	}
+
 	if (!list_empty(&ioc->delayed_tr_list)) {
 		delayed_tr = list_entry(ioc->delayed_tr_list.next,
 		    struct _tr_list, list);
@@ -2732,8 +2866,9 @@ _scsih_tm_tr_complete(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 		_scsih_tm_tr_send(ioc, delayed_tr->handle);
 		list_del(&delayed_tr->list);
 		kfree(delayed_tr);
-		return 0; /* tells base_interrupt not to free mf */
+		return 0;
 	}
+
 	return 1;
 }
 
@@ -2817,6 +2952,165 @@ _scsih_check_topo_delete_events(struct MPT2SAS_ADAPTER *ioc,
 }
 
 /**
+ * _scsih_set_volume_delete_flag - setting volume delete flag
+ * @ioc: per adapter object
+ * @handle: device handle
+ *
+ * This
+ * Return nothing.
+ */
+static void
+_scsih_set_volume_delete_flag(struct MPT2SAS_ADAPTER *ioc, u16 handle)
+{
+	struct _raid_device *raid_device;
+	struct MPT2SAS_TARGET *sas_target_priv_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ioc->raid_device_lock, flags);
+	raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
+	if (raid_device && raid_device->starget &&
+	    raid_device->starget->hostdata) {
+		sas_target_priv_data =
+		    raid_device->starget->hostdata;
+		sas_target_priv_data->deleted = 1;
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
+		    "setting delete flag: handle(0x%04x), "
+		    "wwid(0x%016llx)\n", ioc->name, handle,
+		    (unsigned long long) raid_device->wwid));
+	}
+	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
+}
+
+/**
+ * _scsih_set_volume_handle_for_tr - set handle for target reset to volume
+ * @handle: input handle
+ * @a: handle for volume a
+ * @b: handle for volume b
+ *
+ * IR firmware only supports two raid volumes.  The purpose of this
+ * routine is to set the volume handle in either a or b. When the given
+ * input handle is non-zero, or when a and b have not been set before.
+ */
+static void
+_scsih_set_volume_handle_for_tr(u16 handle, u16 *a, u16 *b)
+{
+	if (!handle || handle == *a || handle == *b)
+		return;
+	if (!*a)
+		*a = handle;
+	else if (!*b)
+		*b = handle;
+}
+
+/**
+ * _scsih_check_ir_config_unhide_events - check for UNHIDE events
+ * @ioc: per adapter object
+ * @event_data: the event data payload
+ * Context: interrupt time.
+ *
+ * This routine will send target reset to volume, followed by target
+ * resets to the PDs. This is called when a PD has been removed, or
+ * volume has been deleted or removed. When the target reset is sent
+ * to volume, the PD target resets need to be queued to start upon
+ * completion of the volume target reset.
+ *
+ * Return nothing.
+ */
+static void
+_scsih_check_ir_config_unhide_events(struct MPT2SAS_ADAPTER *ioc,
+    Mpi2EventDataIrConfigChangeList_t *event_data)
+{
+	Mpi2EventIrConfigElement_t *element;
+	int i;
+	u16 handle, volume_handle, a, b;
+	struct _tr_list *delayed_tr;
+
+	a = 0;
+	b = 0;
+
+	/* Volume Resets for Deleted or Removed */
+	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
+	for (i = 0; i < event_data->NumElements; i++, element++) {
+		if (element->ReasonCode ==
+		    MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED ||
+		    element->ReasonCode ==
+		    MPI2_EVENT_IR_CHANGE_RC_REMOVED) {
+			volume_handle = le16_to_cpu(element->VolDevHandle);
+			_scsih_set_volume_delete_flag(ioc, volume_handle);
+			_scsih_set_volume_handle_for_tr(volume_handle, &a, &b);
+		}
+	}
+
+	/* Volume Resets for UNHIDE events */
+	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
+	for (i = 0; i < event_data->NumElements; i++, element++) {
+		if (le32_to_cpu(event_data->Flags) &
+		    MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG)
+			continue;
+		if (element->ReasonCode == MPI2_EVENT_IR_CHANGE_RC_UNHIDE) {
+			volume_handle = le16_to_cpu(element->VolDevHandle);
+			_scsih_set_volume_handle_for_tr(volume_handle, &a, &b);
+		}
+	}
+
+	if (a)
+		_scsih_tm_tr_volume_send(ioc, a);
+	if (b)
+		_scsih_tm_tr_volume_send(ioc, b);
+
+	/* PD target resets */
+	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
+	for (i = 0; i < event_data->NumElements; i++, element++) {
+		if (element->ReasonCode != MPI2_EVENT_IR_CHANGE_RC_UNHIDE)
+			continue;
+		handle = le16_to_cpu(element->PhysDiskDevHandle);
+		volume_handle = le16_to_cpu(element->VolDevHandle);
+		clear_bit(handle, ioc->pd_handles);
+		if (!volume_handle)
+			_scsih_tm_tr_send(ioc, handle);
+		else if (volume_handle == a || volume_handle == b) {
+			delayed_tr = kzalloc(sizeof(*delayed_tr), GFP_ATOMIC);
+			BUG_ON(!delayed_tr);
+			INIT_LIST_HEAD(&delayed_tr->list);
+			delayed_tr->handle = handle;
+			list_add_tail(&delayed_tr->list, &ioc->delayed_tr_list);
+			dewtprintk(ioc, printk(MPT2SAS_INFO_FMT
+			    "DELAYED:tr:handle(0x%04x), (open)\n", ioc->name,
+			    handle));
+		} else
+			_scsih_tm_tr_send(ioc, handle);
+	}
+}
+
+
+/**
+ * _scsih_check_volume_delete_events - set delete flag for volumes
+ * @ioc: per adapter object
+ * @event_data: the event data payload
+ * Context: interrupt time.
+ *
+ * This will handle the case when the cable connected to entire volume is
+ * pulled. We will take care of setting the deleted flag so normal IO will
+ * not be sent.
+ *
+ * Return nothing.
+ */
+static void
+_scsih_check_volume_delete_events(struct MPT2SAS_ADAPTER *ioc,
+    Mpi2EventDataIrVolume_t *event_data)
+{
+	u32 state;
+
+	if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
+		return;
+	state = le32_to_cpu(event_data->NewValue);
+	if (state == MPI2_RAID_VOL_STATE_MISSING || state ==
+	    MPI2_RAID_VOL_STATE_FAILED)
+		_scsih_set_volume_delete_flag(ioc,
+		    le16_to_cpu(event_data->VolDevHandle));
+}
+
+/**
  * _scsih_flush_running_cmds - completing outstanding commands.
  * @ioc: per adapter object
  *
@@ -4204,7 +4498,6 @@ _scsih_add_device(struct MPT2SAS_ADAPTER *ioc, u16 handle, u8 phy_num, u8 is_pd)
 	sas_device->device_info = device_info;
 	sas_device->sas_address = sas_address;
 	sas_device->phy = sas_device_pg0.PhyNum;
-	sas_device->hidden_raid_component = is_pd;
 
 	/* get enclosure_logical_id */
 	if (sas_device->enclosure_handle && !(mpt2sas_config_get_enclosure_pg0(
@@ -4225,62 +4518,6 @@ _scsih_add_device(struct MPT2SAS_ADAPTER *ioc, u16 handle, u8 phy_num, u8 is_pd)
 }
 
 /**
- * _scsih_remove_pd_device -  removing sas device pd object
- * @ioc: per adapter object
- * @sas_device_delete: the sas_device object
- *
- * For hidden raid components, we do driver-fw handshake from
- * hotplug work threads.
- * Return nothing.
- */
-static void
-_scsih_remove_pd_device(struct MPT2SAS_ADAPTER *ioc, struct _sas_device
-    sas_device)
-{
-	Mpi2SasIoUnitControlReply_t mpi_reply;
-	Mpi2SasIoUnitControlRequest_t mpi_request;
-	u16 vol_handle, handle;
-
-	handle = sas_device.handle;
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: enter: handle(0x%04x),"
-	    " sas_addr(0x%016llx)\n", ioc->name, __func__, handle,
-	    (unsigned long long) sas_device.sas_address));
-
-	vol_handle = sas_device.volume_handle;
-	if (!vol_handle)
-		return;
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "issue target reset: "
-	    "handle(0x%04x)\n", ioc->name, vol_handle));
-	mpt2sas_scsih_issue_tm(ioc, vol_handle, 0, 0, 0,
-	    MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 30, NULL);
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "issue target reset "
-	    "done: handle(0x%04x)\n", ioc->name, vol_handle));
-	if (ioc->shost_recovery)
-		return;
-
-	/* SAS_IO_UNIT_CNTR - send REMOVE_DEVICE */
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "sas_iounit: handle"
-	    "(0x%04x)\n", ioc->name, handle));
-	memset(&mpi_request, 0, sizeof(Mpi2SasIoUnitControlRequest_t));
-	mpi_request.Function = MPI2_FUNCTION_SAS_IO_UNIT_CONTROL;
-	mpi_request.Operation = MPI2_SAS_OP_REMOVE_DEVICE;
-	mpi_request.DevHandle = cpu_to_le16(handle);
-	if ((mpt2sas_base_sas_iounit_control(ioc, &mpi_reply,
-	    &mpi_request)) != 0)
-		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
-		    ioc->name, __FILE__, __LINE__, __func__);
-
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "sas_iounit: ioc_status"
-	    "(0x%04x), loginfo(0x%08x)\n", ioc->name,
-	    le16_to_cpu(mpi_reply.IOCStatus),
-	    le32_to_cpu(mpi_reply.IOCLogInfo)));
-
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: exit: handle(0x%04x),"
-	    " sas_addr(0x%016llx)\n", ioc->name, __func__, handle,
-	    (unsigned long long) sas_device.sas_address));
-}
-
-/**
  * _scsih_remove_device -  removing sas device object
  * @ioc: per adapter object
  * @sas_device_delete: the sas_device object
@@ -4310,9 +4547,6 @@ _scsih_remove_device(struct MPT2SAS_ADAPTER *ioc,
 		sas_target_priv_data->deleted = 1;
 	}
 
-	if (sas_device_backup.hidden_raid_component)
-		_scsih_remove_pd_device(ioc, sas_device_backup);
-
 	_scsih_ublock_io_device(ioc, sas_device_backup.handle);
 
 	mpt2sas_transport_port_remove(ioc, sas_device_backup.sas_address,
@@ -4909,17 +5143,15 @@ _scsih_sas_volume_add(struct MPT2SAS_ADAPTER *ioc,
 /**
  * _scsih_sas_volume_delete - delete volume
  * @ioc: per adapter object
- * @element: IR config element data
+ * @handle: volume device handle
  * Context: user.
  *
  * Return nothing.
  */
 static void
-_scsih_sas_volume_delete(struct MPT2SAS_ADAPTER *ioc,
-    Mpi2EventIrConfigElement_t *element)
+_scsih_sas_volume_delete(struct MPT2SAS_ADAPTER *ioc, u16 handle)
 {
 	struct _raid_device *raid_device;
-	u16 handle = le16_to_cpu(element->VolDevHandle);
 	unsigned long flags;
 	struct MPT2SAS_TARGET *sas_target_priv_data;
 
@@ -4933,6 +5165,9 @@ _scsih_sas_volume_delete(struct MPT2SAS_ADAPTER *ioc,
 		sas_target_priv_data->deleted = 1;
 		scsi_remove_target(&raid_device->starget->dev);
 	}
+	printk(MPT2SAS_INFO_FMT "removing handle(0x%04x), wwid"
+	    "(0x%016llx)\n", ioc->name,  raid_device->handle,
+	    (unsigned long long) raid_device->wwid);
 	_scsih_raid_device_remove(ioc, raid_device);
 }
 
@@ -4961,7 +5196,7 @@ _scsih_sas_pd_expose(struct MPT2SAS_ADAPTER *ioc,
 	/* exposing raid component */
 	sas_device->volume_handle = 0;
 	sas_device->volume_wwid = 0;
-	sas_device->hidden_raid_component = 0;
+	clear_bit(handle, ioc->pd_handles);
 	_scsih_reprobe_target(sas_device->starget, 0);
 }
 
@@ -4992,7 +5227,7 @@ _scsih_sas_pd_hide(struct MPT2SAS_ADAPTER *ioc,
 	    &sas_device->volume_handle);
 	mpt2sas_config_get_volume_wwid(ioc, sas_device->volume_handle,
 	    &sas_device->volume_wwid);
-	sas_device->hidden_raid_component = 1;
+	set_bit(handle, ioc->pd_handles);
 	_scsih_reprobe_target(sas_device->starget, 1);
 }
 
@@ -5041,13 +5276,13 @@ _scsih_sas_pd_add(struct MPT2SAS_ADAPTER *ioc,
 	u64 sas_address;
 	u16 parent_handle;
 
+	set_bit(handle, ioc->pd_handles);
+
 	spin_lock_irqsave(&ioc->sas_device_lock, flags);
 	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
 	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
-	if (sas_device) {
-		sas_device->hidden_raid_component = 1;
+	if (sas_device)
 		return;
-	}
 
 	if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply, &sas_device_pg0,
 	    MPI2_SAS_DEVICE_PGAD_FORM_HANDLE, handle))) {
@@ -5191,7 +5426,8 @@ _scsih_sas_ir_config_change_event(struct MPT2SAS_ADAPTER *ioc,
 		case MPI2_EVENT_IR_CHANGE_RC_VOLUME_DELETED:
 		case MPI2_EVENT_IR_CHANGE_RC_REMOVED:
 			if (!foreign_config)
-				_scsih_sas_volume_delete(ioc, element);
+				_scsih_sas_volume_delete(ioc,
+				    le16_to_cpu(element->VolDevHandle));
 			break;
 		case MPI2_EVENT_IR_CHANGE_RC_PD_CREATED:
 			_scsih_sas_pd_hide(ioc, element);
@@ -5227,7 +5463,6 @@ _scsih_sas_ir_volume_event(struct MPT2SAS_ADAPTER *ioc,
 	u16 handle;
 	u32 state;
 	int rc;
-	struct MPT2SAS_TARGET *sas_target_priv_data;
 	Mpi2EventDataIrVolume_t *event_data = fw_event->event_data;
 
 	if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
@@ -5239,26 +5474,20 @@ _scsih_sas_ir_volume_event(struct MPT2SAS_ADAPTER *ioc,
 	    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
 	    le32_to_cpu(event_data->PreviousValue), state));
 
-	spin_lock_irqsave(&ioc->raid_device_lock, flags);
-	raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
-	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
-
 	switch (state) {
 	case MPI2_RAID_VOL_STATE_MISSING:
 	case MPI2_RAID_VOL_STATE_FAILED:
-		if (!raid_device)
-			break;
-		if (raid_device->starget) {
-			sas_target_priv_data = raid_device->starget->hostdata;
-			sas_target_priv_data->deleted = 1;
-			scsi_remove_target(&raid_device->starget->dev);
-		}
-		_scsih_raid_device_remove(ioc, raid_device);
+		_scsih_sas_volume_delete(ioc, handle);
 		break;
 
 	case MPI2_RAID_VOL_STATE_ONLINE:
 	case MPI2_RAID_VOL_STATE_DEGRADED:
 	case MPI2_RAID_VOL_STATE_OPTIMAL:
+
+		spin_lock_irqsave(&ioc->raid_device_lock, flags);
+		raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
+		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
+
 		if (raid_device)
 			break;
 
@@ -5327,19 +5556,21 @@ _scsih_sas_ir_physical_disk_event(struct MPT2SAS_ADAPTER *ioc,
 	    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
 	    le32_to_cpu(event_data->PreviousValue), state));
 
-	spin_lock_irqsave(&ioc->sas_device_lock, flags);
-	sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
-	spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
-
 	switch (state) {
 	case MPI2_RAID_PD_STATE_ONLINE:
 	case MPI2_RAID_PD_STATE_DEGRADED:
 	case MPI2_RAID_PD_STATE_REBUILDING:
 	case MPI2_RAID_PD_STATE_OPTIMAL:
-		if (sas_device) {
-			sas_device->hidden_raid_component = 1;
+	case MPI2_RAID_PD_STATE_HOT_SPARE:
+
+		set_bit(handle, ioc->pd_handles);
+
+		spin_lock_irqsave(&ioc->sas_device_lock, flags);
+		sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
+		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
+
+		if (sas_device)
 			return;
-		}
 
 		if ((mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
 		    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
@@ -5369,7 +5600,6 @@ _scsih_sas_ir_physical_disk_event(struct MPT2SAS_ADAPTER *ioc,
 	case MPI2_RAID_PD_STATE_OFFLINE:
 	case MPI2_RAID_PD_STATE_NOT_CONFIGURED:
 	case MPI2_RAID_PD_STATE_NOT_COMPATIBLE:
-	case MPI2_RAID_PD_STATE_HOT_SPARE:
 	default:
 		break;
 	}
@@ -5497,7 +5727,7 @@ _scsih_task_set_full(struct MPT2SAS_ADAPTER *ioc, struct fw_event_work
 	sas_address = sas_device->sas_address;
 
 	/* if hidden raid component, then change to volume characteristics */
-	if (sas_device->hidden_raid_component && sas_device->volume_handle) {
+	if (test_bit(handle, ioc->pd_handles) && sas_device->volume_handle) {
 		spin_lock_irqsave(&ioc->raid_device_lock, flags);
 		raid_device = _scsih_raid_device_find_by_handle(
 		    ioc, sas_device->volume_handle);
@@ -5722,9 +5952,11 @@ static void
 _scsih_search_responding_raid_devices(struct MPT2SAS_ADAPTER *ioc)
 {
 	Mpi2RaidVolPage1_t volume_pg1;
+	Mpi2RaidPhysDiskPage0_t pd_pg0;
 	Mpi2ConfigReply_t mpi_reply;
 	u16 ioc_status;
 	u16 handle;
+	u8 phys_disk_num;
 
 	printk(MPT2SAS_INFO_FMT "%s\n", ioc->name, __func__);
 
@@ -5742,6 +5974,21 @@ _scsih_search_responding_raid_devices(struct MPT2SAS_ADAPTER *ioc)
 		_scsih_mark_responding_raid_device(ioc,
 		    le64_to_cpu(volume_pg1.WWID), handle);
 	}
+
+	/* refresh the pd_handles */
+	phys_disk_num = 0xFF;
+	memset(ioc->pd_handles, 0, ioc->pd_handles_sz);
+	while (!(mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
+	    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_GET_NEXT_PHYSDISKNUM,
+	    phys_disk_num))) {
+		ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+		    MPI2_IOCSTATUS_MASK;
+		if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
+			break;
+		phys_disk_num = pd_pg0.PhysDiskNum;
+		handle = le16_to_cpu(pd_pg0.DevHandle);
+		set_bit(handle, ioc->pd_handles);
+	}
 }
 
 /**
@@ -6060,14 +6307,21 @@ mpt2sas_scsih_event_callback(struct MPT2SAS_ADAPTER *ioc, u8 msix_index,
 		    (Mpi2EventDataSasTopologyChangeList_t *)
 		    mpi_reply->EventData);
 		break;
-
+	case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
+		_scsih_check_ir_config_unhide_events(ioc,
+		    (Mpi2EventDataIrConfigChangeList_t *)
+		    mpi_reply->EventData);
+		break;
+	case MPI2_EVENT_IR_VOLUME:
+		_scsih_check_volume_delete_events(ioc,
+		    (Mpi2EventDataIrVolume_t *)
+		    mpi_reply->EventData);
+		break;
 	case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
 	case MPI2_EVENT_IR_OPERATION_STATUS:
 	case MPI2_EVENT_SAS_DISCOVERY:
 	case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
-	case MPI2_EVENT_IR_VOLUME:
 	case MPI2_EVENT_IR_PHYSICAL_DISK:
-	case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
 	case MPI2_EVENT_TASK_SET_FULL:
 		break;
 
@@ -6574,6 +6828,7 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	ioc->scsih_cb_idx = scsih_cb_idx;
 	ioc->config_cb_idx = config_cb_idx;
 	ioc->tm_tr_cb_idx = tm_tr_cb_idx;
+	ioc->tm_tr_volume_cb_idx = tm_tr_volume_cb_idx;
 	ioc->tm_sas_control_cb_idx = tm_sas_control_cb_idx;
 	ioc->logging_level = logging_level;
 	/* misc semaphores and spin locks */
@@ -6592,6 +6847,7 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	INIT_LIST_HEAD(&ioc->raid_device_list);
 	INIT_LIST_HEAD(&ioc->sas_hba.sas_port_list);
 	INIT_LIST_HEAD(&ioc->delayed_tr_list);
+	INIT_LIST_HEAD(&ioc->delayed_tr_volume_list);
 
 	/* init shost parameters */
 	shost->max_cmd_len = 32;
@@ -6894,6 +7150,10 @@ _scsih_init(void)
 
 	tm_tr_cb_idx = mpt2sas_base_register_callback_handler(
 	    _scsih_tm_tr_complete);
+
+	tm_tr_volume_cb_idx = mpt2sas_base_register_callback_handler(
+	    _scsih_tm_volume_tr_complete);
+
 	tm_sas_control_cb_idx = mpt2sas_base_register_callback_handler(
 	    _scsih_sas_control_complete);
 
@@ -6933,6 +7193,7 @@ _scsih_exit(void)
 	mpt2sas_base_release_callback_handler(ctl_cb_idx);
 
 	mpt2sas_base_release_callback_handler(tm_tr_cb_idx);
+	mpt2sas_base_release_callback_handler(tm_tr_volume_cb_idx);
 	mpt2sas_base_release_callback_handler(tm_sas_control_cb_idx);
 
 	/* raid transport support */