scsi: smartpqi: add smp_utils support

Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Mahesh Rajashekhara <mahesh.rajashekhara@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Dave Carroll <david.carroll@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 324 insertions, 60 deletions

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index 4f52b5be3693..ba499a636f43 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -21,6 +21,9 @@
 #if !defined(_SMARTPQI_H)
 #define _SMARTPQI_H
 
+#include <scsi/scsi_host.h>
+#include <linux/bsg-lib.h>
+
 #pragma pack(1)
 
 #define PQI_DEVICE_SIGNATURE	"PQI DREG"
@@ -855,6 +858,7 @@ struct pqi_scsi_dev {
 	u8	unique_id[16];
 	u8	is_physical_device : 1;
 	u8	is_external_raid_device : 1;
+	u8	is_expander_smp_device : 1;
 	u8	target_lun_valid : 1;
 	u8	device_gone : 1;
 	u8	new_device : 1;
@@ -964,6 +968,7 @@ struct pqi_sas_node {
 struct pqi_sas_port {
 	struct list_head port_list_entry;
 	u64	sas_address;
+	struct pqi_scsi_dev *device;
 	struct sas_port *port;
 	int	next_phy_index;
 	struct list_head phy_list_head;
@@ -1129,11 +1134,14 @@ enum pqi_ctrl_mode {
 #define BMIC_WRITE				0x27
 #define BMIC_SENSE_CONTROLLER_PARAMETERS	0x64
 #define BMIC_SENSE_SUBSYSTEM_INFORMATION	0x66
+#define BMIC_CSMI_PASSTHRU			0x68
 #define BMIC_WRITE_HOST_WELLNESS		0xa5
 #define BMIC_FLUSH_CACHE			0xc2
 #define BMIC_SET_DIAG_OPTIONS			0xf4
 #define BMIC_SENSE_DIAG_OPTIONS			0xf5
 
+#define CSMI_CC_SAS_SMP_PASSTHRU		0X17
+
 #define SA_FLUSH_CACHE				0x1
 
 #define MASKED_DEVICE(lunid)			((lunid)[3] & 0xc0)
@@ -1160,6 +1168,10 @@ struct bmic_identify_controller {
 	u8	reserved3[32];
 };
 
+#define SA_EXPANDER_SMP_DEVICE		0x05
+/*SCSI Invalid Device Type for SAS devices*/
+#define PQI_SAS_SCSI_INVALID_DEVTYPE	0xff
+
 struct bmic_identify_physical_device {
 	u8	scsi_bus;		/* SCSI Bus number on controller */
 	u8	scsi_id;		/* SCSI ID on this bus */
@@ -1240,6 +1252,50 @@ struct bmic_identify_physical_device {
 	u8	padding_to_multiple_of_512[9];
 };
 
+struct bmic_smp_request {
+	u8	frame_type;
+	u8	function;
+	u8	allocated_response_length;
+	u8	request_length;
+	u8	additional_request_bytes[1016];
+};
+
+struct  bmic_smp_response {
+	u8	frame_type;
+	u8	function;
+	u8	function_result;
+	u8	response_length;
+	u8	additional_response_bytes[1016];
+};
+
+struct bmic_csmi_ioctl_header {
+	__le32	header_length;
+	u8	signature[8];
+	__le32	timeout;
+	__le32	control_code;
+	__le32	return_code;
+	__le32	length;
+};
+
+struct bmic_csmi_smp_passthru {
+	u8	phy_identifier;
+	u8	port_identifier;
+	u8	connection_rate;
+	u8	reserved;
+	__be64	destination_sas_address;
+	__le32	request_length;
+	struct bmic_smp_request request;
+	u8	connection_status;
+	u8	reserved1[3];
+	__le32	response_length;
+	struct bmic_smp_response response;
+};
+
+struct bmic_csmi_smp_passthru_buffer {
+	struct bmic_csmi_ioctl_header ioctl_header;
+	struct bmic_csmi_smp_passthru parameters;
+};
+
 struct bmic_flush_cache {
 	u8	disable_flag;
 	u8	system_power_action;
@@ -1263,6 +1319,36 @@ struct bmic_diag_options {
 
 #pragma pack()
 
+static inline struct pqi_ctrl_info *shost_to_hba(struct Scsi_Host *shost)
+{
+	void *hostdata = shost_priv(shost);
+
+	return *((struct pqi_ctrl_info **)hostdata);
+}
+
+static inline bool pqi_ctrl_offline(struct pqi_ctrl_info *ctrl_info)
+{
+	return !ctrl_info->controller_online;
+}
+
+static inline void pqi_ctrl_busy(struct pqi_ctrl_info *ctrl_info)
+{
+	atomic_inc(&ctrl_info->num_busy_threads);
+}
+
+static inline void pqi_ctrl_unbusy(struct pqi_ctrl_info *ctrl_info)
+{
+	atomic_dec(&ctrl_info->num_busy_threads);
+}
+
+static inline bool pqi_ctrl_blocked(struct pqi_ctrl_info *ctrl_info)
+{
+	return ctrl_info->block_requests;
+}
+
+void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
+	struct sas_rphy *rphy);
+
 int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info);
 void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info);
 int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
@@ -1271,6 +1357,9 @@ void pqi_remove_sas_device(struct pqi_scsi_dev *device);
 struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
 	struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy);
 void pqi_prep_for_scsi_done(struct scsi_cmnd *scmd);
+int pqi_csmi_smp_passthru(struct pqi_ctrl_info *ctrl_info,
+	struct bmic_csmi_smp_passthru_buffer *buffer, size_t buffer_length,
+	struct pqi_raid_error_info *error_info);
 
 extern struct sas_function_template pqi_sas_transport_functions;
 
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 509a081a6f17..96e171038eb6 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -188,13 +188,6 @@ static inline bool pqi_scsi3addr_equal(u8 *scsi3addr1, u8 *scsi3addr2)
 	return memcmp(scsi3addr1, scsi3addr2, 8) == 0;
 }
 
-static inline struct pqi_ctrl_info *shost_to_hba(struct Scsi_Host *shost)
-{
-	void *hostdata = shost_priv(shost);
-
-	return *((struct pqi_ctrl_info **)hostdata);
-}
-
 static inline bool pqi_is_logical_device(struct pqi_scsi_dev *device)
 {
 	return !device->is_physical_device;
@@ -205,11 +198,6 @@ static inline bool pqi_is_external_raid_addr(u8 *scsi3addr)
 	return scsi3addr[2] != 0;
 }
 
-static inline bool pqi_ctrl_offline(struct pqi_ctrl_info *ctrl_info)
-{
-	return !ctrl_info->controller_online;
-}
-
 static inline void pqi_check_ctrl_health(struct pqi_ctrl_info *ctrl_info)
 {
 	if (ctrl_info->controller_online)
@@ -248,11 +236,6 @@ static inline void pqi_ctrl_unblock_requests(struct pqi_ctrl_info *ctrl_info)
 	scsi_unblock_requests(ctrl_info->scsi_host);
 }
 
-static inline bool pqi_ctrl_blocked(struct pqi_ctrl_info *ctrl_info)
-{
-	return ctrl_info->block_requests;
-}
-
 static unsigned long pqi_wait_if_ctrl_blocked(struct pqi_ctrl_info *ctrl_info,
 	unsigned long timeout_msecs)
 {
@@ -282,16 +265,6 @@ static unsigned long pqi_wait_if_ctrl_blocked(struct pqi_ctrl_info *ctrl_info,
 	return remaining_msecs;
 }
 
-static inline void pqi_ctrl_busy(struct pqi_ctrl_info *ctrl_info)
-{
-	atomic_inc(&ctrl_info->num_busy_threads);
-}
-
-static inline void pqi_ctrl_unbusy(struct pqi_ctrl_info *ctrl_info)
-{
-	atomic_dec(&ctrl_info->num_busy_threads);
-}
-
 static inline void pqi_ctrl_wait_until_quiesced(struct pqi_ctrl_info *ctrl_info)
 {
 	while (atomic_read(&ctrl_info->num_busy_threads) >
@@ -472,6 +445,13 @@ static int pqi_build_raid_path_request(struct pqi_ctrl_info *ctrl_info,
 		cdb[6] = cmd;
 		put_unaligned_be16(cdb_length, &cdb[7]);
 		break;
+	case BMIC_CSMI_PASSTHRU:
+		request->data_direction = SOP_BIDIRECTIONAL;
+		cdb[0] = BMIC_WRITE;
+		cdb[5] = CSMI_CC_SAS_SMP_PASSTHRU;
+		cdb[6] = cmd;
+		put_unaligned_be16(cdb_length, &cdb[7]);
+		break;
 	default:
 		dev_err(&ctrl_info->pci_dev->dev, "unknown command 0x%c\n",
 			cmd);
@@ -713,6 +693,13 @@ static int pqi_flush_cache(struct pqi_ctrl_info *ctrl_info,
 	return rc;
 }
 
+int pqi_csmi_smp_passthru(struct pqi_ctrl_info *ctrl_info,
+	struct bmic_csmi_smp_passthru_buffer *buffer, size_t buffer_length,
+	struct pqi_raid_error_info *error_info)
+{
+	return pqi_send_ctrl_raid_with_error(ctrl_info, BMIC_CSMI_PASSTHRU,
+		buffer, buffer_length, error_info);
+}
 
 #define PQI_FETCH_PTRAID_DATA (1UL<<31)
 
@@ -1298,6 +1285,9 @@ static int pqi_get_device_info(struct pqi_ctrl_info *ctrl_info,
 	u8 *buffer;
 	unsigned int retries;
 
+	if (device->is_expander_smp_device)
+		return 0;
+
 	buffer = kmalloc(64, GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;
@@ -1585,6 +1575,14 @@ static enum pqi_find_result pqi_scsi_find_entry(struct pqi_ctrl_info *ctrl_info,
 	return DEVICE_NOT_FOUND;
 }
 
+static inline const char *pqi_device_type(struct pqi_scsi_dev *device)
+{
+	if (device->is_expander_smp_device)
+		return "Enclosure SMP    ";
+
+	return scsi_device_type(device->devtype);
+}
+
 #define PQI_DEV_INFO_BUFFER_LENGTH	128
 
 static void pqi_dev_info(struct pqi_ctrl_info *ctrl_info,
@@ -1620,7 +1618,7 @@ static void pqi_dev_info(struct pqi_ctrl_info *ctrl_info,
 
 	count += snprintf(buffer + count, PQI_DEV_INFO_BUFFER_LENGTH - count,
 		" %s %.8s %.16s ",
-		scsi_device_type(device->devtype),
+		pqi_device_type(device),
 		device->vendor,
 		device->model);
 
@@ -1665,6 +1663,8 @@ static void pqi_scsi_update_device(struct pqi_scsi_dev *existing_device,
 	existing_device->is_physical_device = new_device->is_physical_device;
 	existing_device->is_external_raid_device =
 		new_device->is_external_raid_device;
+	existing_device->is_expander_smp_device =
+		new_device->is_expander_smp_device;
 	existing_device->aio_enabled = new_device->aio_enabled;
 	memcpy(existing_device->vendor, new_device->vendor,
 		sizeof(existing_device->vendor));
@@ -1721,6 +1721,14 @@ static inline void pqi_fixup_botched_add(struct pqi_ctrl_info *ctrl_info,
 	device->keep_device = false;
 }
 
+static inline bool pqi_is_device_added(struct pqi_scsi_dev *device)
+{
+	if (device->is_expander_smp_device)
+		return device->sas_port != NULL;
+
+	return device->sdev != NULL;
+}
+
 static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 	struct pqi_scsi_dev *new_device_list[], unsigned int num_new_devices)
 {
@@ -1815,7 +1823,7 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 		} else {
 			pqi_dev_info(ctrl_info, "removed", device);
 		}
-		if (device->sdev)
+		if (pqi_is_device_added(device))
 			pqi_remove_device(ctrl_info, device);
 		list_del(&device->delete_list_entry);
 		pqi_free_device(device);
@@ -1837,7 +1845,7 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 
 	/* Expose any new devices. */
 	list_for_each_entry_safe(device, next, &add_list, add_list_entry) {
-		if (!device->sdev) {
+		if (!pqi_is_device_added(device)) {
 			pqi_dev_info(ctrl_info, "added", device);
 			rc = pqi_add_device(ctrl_info, device);
 			if (rc) {
@@ -1854,7 +1862,12 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 
 static bool pqi_is_supported_device(struct pqi_scsi_dev *device)
 {
-	bool is_supported = false;
+	bool is_supported;
+
+	if (device->is_expander_smp_device)
+		return true;
+
+	is_supported = false;
 
 	switch (device->devtype) {
 	case TYPE_DISK:
@@ -1888,6 +1901,24 @@ static inline bool pqi_skip_device(u8 *scsi3addr)
 	return false;
 }
 
+static inline bool pqi_is_device_with_sas_address(struct pqi_scsi_dev *device)
+{
+	if (!device->is_physical_device)
+		return false;
+
+	if (device->is_expander_smp_device)
+		return true;
+
+	switch (device->devtype) {
+	case TYPE_DISK:
+	case TYPE_ZBC:
+	case TYPE_ENCLOSURE:
+		return true;
+	}
+
+	return false;
+}
+
 static inline bool pqi_expose_device(struct pqi_scsi_dev *device)
 {
 	return !device->is_physical_device ||
@@ -2002,9 +2033,14 @@ static int pqi_update_scsi_devices(struct pqi_ctrl_info *ctrl_info)
 
 		memcpy(device->scsi3addr, scsi3addr, sizeof(device->scsi3addr));
 		device->is_physical_device = is_physical_device;
-		if (!is_physical_device)
+		if (is_physical_device) {
+			if (phys_lun_ext_entry->device_type ==
+				SA_EXPANDER_SMP_DEVICE)
+				device->is_expander_smp_device = true;
+		} else {
 			device->is_external_raid_device =
 				pqi_is_external_raid_addr(scsi3addr);
+		}
 
 		/* Gather information about the device. */
 		rc = pqi_get_device_info(ctrl_info, device);
@@ -2037,30 +2073,23 @@ static int pqi_update_scsi_devices(struct pqi_ctrl_info *ctrl_info)
 			device->wwid = phys_lun_ext_entry->wwid;
 			if ((phys_lun_ext_entry->device_flags &
 				REPORT_PHYS_LUN_DEV_FLAG_AIO_ENABLED) &&
-				phys_lun_ext_entry->aio_handle)
+				phys_lun_ext_entry->aio_handle) {
 				device->aio_enabled = true;
+					device->aio_handle =
+						phys_lun_ext_entry->aio_handle;
+			}
+			if (device->devtype == TYPE_DISK ||
+				device->devtype == TYPE_ZBC) {
+				pqi_get_physical_disk_info(ctrl_info,
+					device, id_phys);
+			}
 		} else {
 			memcpy(device->volume_id, log_lun_ext_entry->volume_id,
 				sizeof(device->volume_id));
 		}
 
-		switch (device->devtype) {
-		case TYPE_DISK:
-		case TYPE_ZBC:
-		case TYPE_ENCLOSURE:
-			if (device->is_physical_device) {
-				device->sas_address =
-					get_unaligned_be64(&device->wwid);
-				if (device->devtype == TYPE_DISK ||
-					device->devtype == TYPE_ZBC) {
-					device->aio_handle =
-						phys_lun_ext_entry->aio_handle;
-					pqi_get_physical_disk_info(ctrl_info,
-						device, id_phys);
-				}
-			}
-			break;
-		}
+		if (pqi_is_device_with_sas_address(device))
+			device->sas_address = get_unaligned_be64(&device->wwid);
 
 		new_device_list[num_valid_devices++] = device;
 	}
@@ -2103,7 +2132,7 @@ static void pqi_remove_all_scsi_devices(struct pqi_ctrl_info *ctrl_info)
 		if (!device)
 			break;
 
-		if (device->sdev)
+		if (pqi_is_device_added(device))
 			pqi_remove_device(ctrl_info, device);
 		pqi_free_device(device);
 	}
diff --git a/drivers/scsi/smartpqi/smartpqi_sas_transport.c b/drivers/scsi/smartpqi/smartpqi_sas_transport.c
index b209a35e482e..0e4ef215115f 100644
--- a/drivers/scsi/smartpqi/smartpqi_sas_transport.c
+++ b/drivers/scsi/smartpqi/smartpqi_sas_transport.c
@@ -17,9 +17,11 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/bsg-lib.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_transport_sas.h>
+#include <asm/unaligned.h>
 #include "smartpqi.h"
 
 static struct pqi_sas_phy *pqi_alloc_sas_phy(struct pqi_sas_port *pqi_sas_port)
@@ -97,14 +99,32 @@ static int pqi_sas_port_add_rphy(struct pqi_sas_port *pqi_sas_port,
 
 	identify = &rphy->identify;
 	identify->sas_address = pqi_sas_port->sas_address;
-	identify->initiator_port_protocols = SAS_PROTOCOL_STP;
-	identify->target_port_protocols = SAS_PROTOCOL_STP;
+
+	if (pqi_sas_port->device &&
+		pqi_sas_port->device->is_expander_smp_device) {
+		identify->initiator_port_protocols = SAS_PROTOCOL_SMP;
+		identify->target_port_protocols = SAS_PROTOCOL_SMP;
+	} else {
+		identify->initiator_port_protocols = SAS_PROTOCOL_STP;
+		identify->target_port_protocols = SAS_PROTOCOL_STP;
+	}
 
 	return sas_rphy_add(rphy);
 }
 
+static struct sas_rphy *pqi_sas_rphy_alloc(struct pqi_sas_port *pqi_sas_port)
+{
+	if (pqi_sas_port->device &&
+		pqi_sas_port->device->is_expander_smp_device)
+		return sas_expander_alloc(pqi_sas_port->port,
+				SAS_FANOUT_EXPANDER_DEVICE);
+
+	return sas_end_device_alloc(pqi_sas_port->port);
+}
+
 static struct pqi_sas_port *pqi_alloc_sas_port(
-	struct pqi_sas_node *pqi_sas_node, u64 sas_address)
+	struct pqi_sas_node *pqi_sas_node, u64 sas_address,
+	struct pqi_scsi_dev *device)
 {
 	int rc;
 	struct pqi_sas_port *pqi_sas_port;
@@ -127,6 +147,7 @@ static struct pqi_sas_port *pqi_alloc_sas_port(
 
 	pqi_sas_port->port = port;
 	pqi_sas_port->sas_address = sas_address;
+	pqi_sas_port->device = device;
 	list_add_tail(&pqi_sas_port->port_list_entry,
 		&pqi_sas_node->port_list_head);
 
@@ -146,7 +167,7 @@ static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
 	struct pqi_sas_phy *next;
 
 	list_for_each_entry_safe(pqi_sas_phy, next,
-			&pqi_sas_port->phy_list_head, phy_list_entry)
+		&pqi_sas_port->phy_list_head, phy_list_entry)
 		pqi_free_sas_phy(pqi_sas_phy);
 
 	sas_port_delete(pqi_sas_port->port);
@@ -176,7 +197,7 @@ static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
 		return;
 
 	list_for_each_entry_safe(pqi_sas_port, next,
-			&pqi_sas_node->port_list_head, port_list_entry)
+		&pqi_sas_node->port_list_head, port_list_entry)
 		pqi_free_sas_port(pqi_sas_port);
 
 	kfree(pqi_sas_node);
@@ -206,13 +227,14 @@ int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
 	struct pqi_sas_port *pqi_sas_port;
 	struct pqi_sas_phy *pqi_sas_phy;
 
-	parent_dev = &shost->shost_gendev;
+	parent_dev = &shost->shost_dev;
 
 	pqi_sas_node = pqi_alloc_sas_node(parent_dev);
 	if (!pqi_sas_node)
 		return -ENOMEM;
 
-	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node, ctrl_info->sas_address);
+	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
+		ctrl_info->sas_address, NULL);
 	if (!pqi_sas_port) {
 		rc = -ENODEV;
 		goto free_sas_node;
@@ -254,11 +276,12 @@ int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
 	struct pqi_sas_port *pqi_sas_port;
 	struct sas_rphy *rphy;
 
-	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node, device->sas_address);
+	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node,
+		device->sas_address, device);
 	if (!pqi_sas_port)
 		return -ENOMEM;
 
-	rphy = sas_end_device_alloc(pqi_sas_port->port);
+	rphy = pqi_sas_rphy_alloc(pqi_sas_port);
 	if (!rphy) {
 		rc = -ENODEV;
 		goto free_sas_port;
@@ -329,6 +352,128 @@ static int pqi_sas_phy_speed(struct sas_phy *phy,
 	return -EINVAL;
 }
 
+#define CSMI_IOCTL_TIMEOUT	60
+#define SMP_CRC_FIELD_LENGTH	4
+
+static struct bmic_csmi_smp_passthru_buffer *
+pqi_build_csmi_smp_passthru_buffer(struct sas_rphy *rphy,
+	struct bsg_job *job)
+{
+	struct bmic_csmi_smp_passthru_buffer *smp_buf;
+	struct bmic_csmi_ioctl_header *ioctl_header;
+	struct bmic_csmi_smp_passthru *parameters;
+	u32 req_size;
+	u32 resp_size;
+
+	smp_buf = kzalloc(sizeof(*smp_buf), GFP_KERNEL);
+	if (!smp_buf)
+		return NULL;
+
+	req_size = job->request_payload.payload_len;
+	resp_size = job->reply_payload.payload_len;
+
+	ioctl_header = &smp_buf->ioctl_header;
+	put_unaligned_le32(sizeof(smp_buf->ioctl_header),
+		&ioctl_header->header_length);
+	put_unaligned_le32(CSMI_IOCTL_TIMEOUT, &ioctl_header->timeout);
+	put_unaligned_le32(CSMI_CC_SAS_SMP_PASSTHRU,
+		&ioctl_header->control_code);
+	put_unaligned_le32(sizeof(smp_buf->parameters), &ioctl_header->length);
+
+	parameters = &smp_buf->parameters;
+	parameters->phy_identifier = rphy->identify.phy_identifier;
+	parameters->port_identifier = 0;
+	parameters->connection_rate = 0;
+	put_unaligned_be64(rphy->identify.sas_address,
+		&parameters->destination_sas_address);
+
+	if (req_size > SMP_CRC_FIELD_LENGTH)
+		req_size -= SMP_CRC_FIELD_LENGTH;
+
+	put_unaligned_le32(req_size, &parameters->request_length);
+
+	put_unaligned_le32(resp_size, &parameters->response_length);
+
+	sg_copy_to_buffer(job->request_payload.sg_list,
+		job->reply_payload.sg_cnt, &parameters->request,
+		req_size);
+
+	return smp_buf;
+}
+
+static unsigned int pqi_build_sas_smp_handler_reply(
+	struct bmic_csmi_smp_passthru_buffer *smp_buf, struct bsg_job *job,
+	struct pqi_raid_error_info *error_info)
+{
+	sg_copy_from_buffer(job->reply_payload.sg_list,
+		job->reply_payload.sg_cnt, &smp_buf->parameters.response,
+		le32_to_cpu(smp_buf->parameters.response_length));
+
+	job->reply_len = le16_to_cpu(error_info->sense_data_length);
+	memcpy(job->reply, error_info->data,
+			le16_to_cpu(error_info->sense_data_length));
+
+	return job->reply_payload.payload_len -
+		get_unaligned_le32(&error_info->data_in_transferred);
+}
+
+void pqi_sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
+	struct sas_rphy *rphy)
+{
+	int rc;
+	struct pqi_ctrl_info *ctrl_info = shost_to_hba(shost);
+	struct bmic_csmi_smp_passthru_buffer *smp_buf;
+	struct pqi_raid_error_info error_info;
+	unsigned int reslen = 0;
+
+	pqi_ctrl_busy(ctrl_info);
+
+	if (job->reply_payload.payload_len == 0) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	if (!rphy) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (rphy->identify.device_type != SAS_FANOUT_EXPANDER_DEVICE) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (job->request_payload.sg_cnt > 1 || job->reply_payload.sg_cnt > 1) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (pqi_ctrl_offline(ctrl_info)) {
+		rc = -ENXIO;
+		goto out;
+	}
+
+	if (pqi_ctrl_blocked(ctrl_info)) {
+		rc = -EBUSY;
+		goto out;
+	}
+
+	smp_buf = pqi_build_csmi_smp_passthru_buffer(rphy, job);
+	if (!smp_buf) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	rc = pqi_csmi_smp_passthru(ctrl_info, smp_buf, sizeof(*smp_buf),
+		&error_info);
+	if (rc)
+		goto out;
+
+	reslen = pqi_build_sas_smp_handler_reply(smp_buf, job, &error_info);
+out:
+	bsg_job_done(job, rc, reslen);
+	pqi_ctrl_unbusy(ctrl_info);
+}
 struct sas_function_template pqi_sas_transport_functions = {
 	.get_linkerrors = pqi_sas_get_linkerrors,
 	.get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
@@ -338,4 +483,5 @@ struct sas_function_template pqi_sas_transport_functions = {
 	.phy_setup = pqi_sas_phy_setup,
 	.phy_release = pqi_sas_phy_release,
 	.set_phy_speed = pqi_sas_phy_speed,
+	.smp_handler = pqi_sas_smp_handler,
 };