Initial import

1 files changed, 1971 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
new file mode 100644
index 000000000..9a058194b
--- /dev/null
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -0,0 +1,1971 @@
+/*
+ * Copyright (C) 2005-2006 Dell Inc.
+ *	Released under GPL v2.
+ *
+ * Serial Attached SCSI (SAS) transport class.
+ *
+ * The SAS transport class contains common code to deal with SAS HBAs,
+ * an aproximated representation of SAS topologies in the driver model,
+ * and various sysfs attributes to expose these topologies and management
+ * interfaces to userspace.
+ *
+ * In addition to the basic SCSI core objects this transport class
+ * introduces two additional intermediate objects:  The SAS PHY
+ * as represented by struct sas_phy defines an "outgoing" PHY on
+ * a SAS HBA or Expander, and the SAS remote PHY represented by
+ * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
+ * end device.  Note that this is purely a software concept, the
+ * underlying hardware for a PHY and a remote PHY is the exactly
+ * the same.
+ *
+ * There is no concept of a SAS port in this code, users can see
+ * what PHYs form a wide port based on the port_identifier attribute,
+ * which is the same for all PHYs in a port.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/blkdev.h>
+#include <linux/bsg.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+
+#include "scsi_sas_internal.h"
+struct sas_host_attrs {
+	struct list_head rphy_list;
+	struct mutex lock;
+	struct request_queue *q;
+	u32 next_target_id;
+	u32 next_expander_id;
+	int next_port_id;
+};
+#define to_sas_host_attrs(host)	((struct sas_host_attrs *)(host)->shost_data)
+
+
+/*
+ * Hack to allow attributes of the same name in different objects.
+ */
+#define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
+	struct device_attribute dev_attr_##_prefix##_##_name = \
+	__ATTR(_name,_mode,_show,_store)
+
+
+/*
+ * Pretty printing helpers
+ */
+
+#define sas_bitfield_name_match(title, table)			\
+static ssize_t							\
+get_sas_##title##_names(u32 table_key, char *buf)		\
+{								\
+	char *prefix = "";					\
+	ssize_t len = 0;					\
+	int i;							\
+								\
+	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
+		if (table[i].value & table_key) {		\
+			len += sprintf(buf + len, "%s%s",	\
+				prefix, table[i].name);		\
+			prefix = ", ";				\
+		}						\
+	}							\
+	len += sprintf(buf + len, "\n");			\
+	return len;						\
+}
+
+#define sas_bitfield_name_set(title, table)			\
+static ssize_t							\
+set_sas_##title##_names(u32 *table_key, const char *buf)	\
+{								\
+	ssize_t len = 0;					\
+	int i;							\
+								\
+	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
+		len = strlen(table[i].name);			\
+		if (strncmp(buf, table[i].name, len) == 0 &&	\
+		    (buf[len] == '\n' || buf[len] == '\0')) {	\
+			*table_key = table[i].value;		\
+			return 0;				\
+		}						\
+	}							\
+	return -EINVAL;						\
+}
+
+#define sas_bitfield_name_search(title, table)			\
+static ssize_t							\
+get_sas_##title##_names(u32 table_key, char *buf)		\
+{								\
+	ssize_t len = 0;					\
+	int i;							\
+								\
+	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
+		if (table[i].value == table_key) {		\
+			len += sprintf(buf + len, "%s",		\
+				table[i].name);			\
+			break;					\
+		}						\
+	}							\
+	len += sprintf(buf + len, "\n");			\
+	return len;						\
+}
+
+static struct {
+	u32		value;
+	char		*name;
+} sas_device_type_names[] = {
+	{ SAS_PHY_UNUSED,		"unused" },
+	{ SAS_END_DEVICE,		"end device" },
+	{ SAS_EDGE_EXPANDER_DEVICE,	"edge expander" },
+	{ SAS_FANOUT_EXPANDER_DEVICE,	"fanout expander" },
+};
+sas_bitfield_name_search(device_type, sas_device_type_names)
+
+
+static struct {
+	u32		value;
+	char		*name;
+} sas_protocol_names[] = {
+	{ SAS_PROTOCOL_SATA,		"sata" },
+	{ SAS_PROTOCOL_SMP,		"smp" },
+	{ SAS_PROTOCOL_STP,		"stp" },
+	{ SAS_PROTOCOL_SSP,		"ssp" },
+};
+sas_bitfield_name_match(protocol, sas_protocol_names)
+
+static struct {
+	u32		value;
+	char		*name;
+} sas_linkspeed_names[] = {
+	{ SAS_LINK_RATE_UNKNOWN,	"Unknown" },
+	{ SAS_PHY_DISABLED,		"Phy disabled" },
+	{ SAS_LINK_RATE_FAILED,		"Link Rate failed" },
+	{ SAS_SATA_SPINUP_HOLD,		"Spin-up hold" },
+	{ SAS_LINK_RATE_1_5_GBPS,	"1.5 Gbit" },
+	{ SAS_LINK_RATE_3_0_GBPS,	"3.0 Gbit" },
+	{ SAS_LINK_RATE_6_0_GBPS,	"6.0 Gbit" },
+	{ SAS_LINK_RATE_12_0_GBPS,	"12.0 Gbit" },
+};
+sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
+sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
+
+static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
+{
+	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
+	struct sas_end_device *rdev;
+
+	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
+
+	rdev = rphy_to_end_device(rphy);
+	return rdev;
+}
+
+static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
+			    struct sas_rphy *rphy)
+{
+	struct request *req;
+	int ret;
+	int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
+
+	while ((req = blk_fetch_request(q)) != NULL) {
+		spin_unlock_irq(q->queue_lock);
+
+		handler = to_sas_internal(shost->transportt)->f->smp_handler;
+		ret = handler(shost, rphy, req);
+		req->errors = ret;
+
+		blk_end_request_all(req, ret);
+
+		spin_lock_irq(q->queue_lock);
+	}
+}
+
+static void sas_host_smp_request(struct request_queue *q)
+{
+	sas_smp_request(q, (struct Scsi_Host *)q->queuedata, NULL);
+}
+
+static void sas_non_host_smp_request(struct request_queue *q)
+{
+	struct sas_rphy *rphy = q->queuedata;
+	sas_smp_request(q, rphy_to_shost(rphy), rphy);
+}
+
+static void sas_host_release(struct device *dev)
+{
+	struct Scsi_Host *shost = dev_to_shost(dev);
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+	struct request_queue *q = sas_host->q;
+
+	if (q)
+		blk_cleanup_queue(q);
+}
+
+static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
+{
+	struct request_queue *q;
+	int error;
+	struct device *dev;
+	char namebuf[20];
+	const char *name;
+	void (*release)(struct device *);
+
+	if (!to_sas_internal(shost->transportt)->f->smp_handler) {
+		printk("%s can't handle SMP requests\n", shost->hostt->name);
+		return 0;
+	}
+
+	if (rphy) {
+		q = blk_init_queue(sas_non_host_smp_request, NULL);
+		dev = &rphy->dev;
+		name = dev_name(dev);
+		release = NULL;
+	} else {
+		q = blk_init_queue(sas_host_smp_request, NULL);
+		dev = &shost->shost_gendev;
+		snprintf(namebuf, sizeof(namebuf),
+			 "sas_host%d", shost->host_no);
+		name = namebuf;
+		release = sas_host_release;
+	}
+	if (!q)
+		return -ENOMEM;
+
+	error = bsg_register_queue(q, dev, name, release);
+	if (error) {
+		blk_cleanup_queue(q);
+		return -ENOMEM;
+	}
+
+	if (rphy)
+		rphy->q = q;
+	else
+		to_sas_host_attrs(shost)->q = q;
+
+	if (rphy)
+		q->queuedata = rphy;
+	else
+		q->queuedata = shost;
+
+	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
+	return 0;
+}
+
+static void sas_bsg_remove(struct Scsi_Host *shost, struct sas_rphy *rphy)
+{
+	struct request_queue *q;
+
+	if (rphy)
+		q = rphy->q;
+	else
+		q = to_sas_host_attrs(shost)->q;
+
+	if (!q)
+		return;
+
+	bsg_unregister_queue(q);
+}
+
+/*
+ * SAS host attributes
+ */
+
+static int sas_host_setup(struct transport_container *tc, struct device *dev,
+			  struct device *cdev)
+{
+	struct Scsi_Host *shost = dev_to_shost(dev);
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+	INIT_LIST_HEAD(&sas_host->rphy_list);
+	mutex_init(&sas_host->lock);
+	sas_host->next_target_id = 0;
+	sas_host->next_expander_id = 0;
+	sas_host->next_port_id = 0;
+
+	if (sas_bsg_initialize(shost, NULL))
+		dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
+			   shost->host_no);
+
+	return 0;
+}
+
+static int sas_host_remove(struct transport_container *tc, struct device *dev,
+			   struct device *cdev)
+{
+	struct Scsi_Host *shost = dev_to_shost(dev);
+
+	sas_bsg_remove(shost, NULL);
+
+	return 0;
+}
+
+static DECLARE_TRANSPORT_CLASS(sas_host_class,
+		"sas_host", sas_host_setup, sas_host_remove, NULL);
+
+static int sas_host_match(struct attribute_container *cont,
+			    struct device *dev)
+{
+	struct Scsi_Host *shost;
+	struct sas_internal *i;
+
+	if (!scsi_is_host_device(dev))
+		return 0;
+	shost = dev_to_shost(dev);
+
+	if (!shost->transportt)
+		return 0;
+	if (shost->transportt->host_attrs.ac.class !=
+			&sas_host_class.class)
+		return 0;
+
+	i = to_sas_internal(shost->transportt);
+	return &i->t.host_attrs.ac == cont;
+}
+
+static int do_sas_phy_delete(struct device *dev, void *data)
+{
+	int pass = (int)(unsigned long)data;
+
+	if (pass == 0 && scsi_is_sas_port(dev))
+		sas_port_delete(dev_to_sas_port(dev));
+	else if (pass == 1 && scsi_is_sas_phy(dev))
+		sas_phy_delete(dev_to_phy(dev));
+	return 0;
+}
+
+/**
+ * sas_remove_children  -  tear down a devices SAS data structures
+ * @dev:	device belonging to the sas object
+ *
+ * Removes all SAS PHYs and remote PHYs for a given object
+ */
+void sas_remove_children(struct device *dev)
+{
+	device_for_each_child(dev, (void *)0, do_sas_phy_delete);
+	device_for_each_child(dev, (void *)1, do_sas_phy_delete);
+}
+EXPORT_SYMBOL(sas_remove_children);
+
+/**
+ * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
+ * @shost:	Scsi Host that is torn down
+ *
+ * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
+ * Must be called just before scsi_remove_host for SAS HBAs.
+ */
+void sas_remove_host(struct Scsi_Host *shost)
+{
+	sas_remove_children(&shost->shost_gendev);
+}
+EXPORT_SYMBOL(sas_remove_host);
+
+/**
+ * sas_tlr_supported - checking TLR bit in vpd 0x90
+ * @sdev: scsi device struct
+ *
+ * Check Transport Layer Retries are supported or not.
+ * If vpd page 0x90 is present, TRL is supported.
+ *
+ */
+unsigned int
+sas_tlr_supported(struct scsi_device *sdev)
+{
+	const int vpd_len = 32;
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
+	int ret = 0;
+
+	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
+		goto out;
+
+	/*
+	 * Magic numbers: the VPD Protocol page (0x90)
+	 * has a 4 byte header and then one entry per device port
+	 * the TLR bit is at offset 8 on each port entry
+	 * if we take the first port, that's at total offset 12
+	 */
+	ret = buffer[12] & 0x01;
+
+ out:
+	kfree(buffer);
+	rdev->tlr_supported = ret;
+	return ret;
+
+}
+EXPORT_SYMBOL_GPL(sas_tlr_supported);
+
+/**
+ * sas_disable_tlr - setting TLR flags
+ * @sdev: scsi device struct
+ *
+ * Seting tlr_enabled flag to 0.
+ *
+ */
+void
+sas_disable_tlr(struct scsi_device *sdev)
+{
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+
+	rdev->tlr_enabled = 0;
+}
+EXPORT_SYMBOL_GPL(sas_disable_tlr);
+
+/**
+ * sas_enable_tlr - setting TLR flags
+ * @sdev: scsi device struct
+ *
+ * Seting tlr_enabled flag 1.
+ *
+ */
+void sas_enable_tlr(struct scsi_device *sdev)
+{
+	unsigned int tlr_supported = 0;
+	tlr_supported  = sas_tlr_supported(sdev);
+
+	if (tlr_supported) {
+		struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+
+		rdev->tlr_enabled = 1;
+	}
+
+	return;
+}
+EXPORT_SYMBOL_GPL(sas_enable_tlr);
+
+unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
+{
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+	return rdev->tlr_enabled;
+}
+EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
+
+/*
+ * SAS Phy attributes
+ */
+
+#define sas_phy_show_simple(field, name, format_string, cast)		\
+static ssize_t								\
+show_sas_phy_##name(struct device *dev, 				\
+		    struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_phy *phy = transport_class_to_phy(dev);		\
+									\
+	return snprintf(buf, 20, format_string, cast phy->field);	\
+}
+
+#define sas_phy_simple_attr(field, name, format_string, type)		\
+	sas_phy_show_simple(field, name, format_string, (type))	\
+static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
+
+#define sas_phy_show_protocol(field, name)				\
+static ssize_t								\
+show_sas_phy_##name(struct device *dev, 				\
+		    struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_phy *phy = transport_class_to_phy(dev);		\
+									\
+	if (!phy->field)						\
+		return snprintf(buf, 20, "none\n");			\
+	return get_sas_protocol_names(phy->field, buf);		\
+}
+
+#define sas_phy_protocol_attr(field, name)				\
+	sas_phy_show_protocol(field, name)				\
+static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
+
+#define sas_phy_show_linkspeed(field)					\
+static ssize_t								\
+show_sas_phy_##field(struct device *dev, 				\
+		     struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_phy *phy = transport_class_to_phy(dev);		\
+									\
+	return get_sas_linkspeed_names(phy->field, buf);		\
+}
+
+/* Fudge to tell if we're minimum or maximum */
+#define sas_phy_store_linkspeed(field)					\
+static ssize_t								\
+store_sas_phy_##field(struct device *dev, 				\
+		      struct device_attribute *attr, 			\
+		      const char *buf,	size_t count)			\
+{									\
+	struct sas_phy *phy = transport_class_to_phy(dev);		\
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
+	struct sas_internal *i = to_sas_internal(shost->transportt);	\
+	u32 value;							\
+	struct sas_phy_linkrates rates = {0};				\
+	int error;							\
+									\
+	error = set_sas_linkspeed_names(&value, buf);			\
+	if (error)							\
+		return error;						\
+	rates.field = value;						\
+	error = i->f->set_phy_speed(phy, &rates);			\
+									\
+	return error ? error : count;					\
+}
+
+#define sas_phy_linkspeed_rw_attr(field)				\
+	sas_phy_show_linkspeed(field)					\
+	sas_phy_store_linkspeed(field)					\
+static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,		\
+	store_sas_phy_##field)
+
+#define sas_phy_linkspeed_attr(field)					\
+	sas_phy_show_linkspeed(field)					\
+static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
+
+
+#define sas_phy_show_linkerror(field)					\
+static ssize_t								\
+show_sas_phy_##field(struct device *dev, 				\
+		     struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_phy *phy = transport_class_to_phy(dev);		\
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
+	struct sas_internal *i = to_sas_internal(shost->transportt);	\
+	int error;							\
+									\
+	error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
+	if (error)							\
+		return error;						\
+	return snprintf(buf, 20, "%u\n", phy->field);			\
+}
+
+#define sas_phy_linkerror_attr(field)					\
+	sas_phy_show_linkerror(field)					\
+static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
+
+
+static ssize_t
+show_sas_device_type(struct device *dev,
+		     struct device_attribute *attr, char *buf)
+{
+	struct sas_phy *phy = transport_class_to_phy(dev);
+
+	if (!phy->identify.device_type)
+		return snprintf(buf, 20, "none\n");
+	return get_sas_device_type_names(phy->identify.device_type, buf);
+}
+static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
+
+static ssize_t do_sas_phy_enable(struct device *dev,
+		size_t count, int enable)
+{
+	struct sas_phy *phy = transport_class_to_phy(dev);
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+	struct sas_internal *i = to_sas_internal(shost->transportt);
+	int error;
+
+	error = i->f->phy_enable(phy, enable);
+	if (error)
+		return error;
+	phy->enabled = enable;
+	return count;
+};
+
+static ssize_t
+store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
+		     const char *buf, size_t count)
+{
+	if (count < 1)
+		return -EINVAL;
+
+	switch (buf[0]) {
+	case '0':
+		do_sas_phy_enable(dev, count, 0);
+		break;
+	case '1':
+		do_sas_phy_enable(dev, count, 1);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return count;
+}
+
+static ssize_t
+show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct sas_phy *phy = transport_class_to_phy(dev);
+
+	return snprintf(buf, 20, "%d", phy->enabled);
+}
+
+static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
+			 store_sas_phy_enable);
+
+static ssize_t
+do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
+{
+	struct sas_phy *phy = transport_class_to_phy(dev);
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+	struct sas_internal *i = to_sas_internal(shost->transportt);
+	int error;
+
+	error = i->f->phy_reset(phy, hard_reset);
+	if (error)
+		return error;
+	phy->enabled = 1;
+	return count;
+};
+
+static ssize_t
+store_sas_link_reset(struct device *dev, struct device_attribute *attr,
+		     const char *buf, size_t count)
+{
+	return do_sas_phy_reset(dev, count, 0);
+}
+static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
+
+static ssize_t
+store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
+		     const char *buf, size_t count)
+{
+	return do_sas_phy_reset(dev, count, 1);
+}
+static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
+
+sas_phy_protocol_attr(identify.initiator_port_protocols,
+		initiator_port_protocols);
+sas_phy_protocol_attr(identify.target_port_protocols,
+		target_port_protocols);
+sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
+		unsigned long long);
+sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
+//sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
+sas_phy_linkspeed_attr(negotiated_linkrate);
+sas_phy_linkspeed_attr(minimum_linkrate_hw);
+sas_phy_linkspeed_rw_attr(minimum_linkrate);
+sas_phy_linkspeed_attr(maximum_linkrate_hw);
+sas_phy_linkspeed_rw_attr(maximum_linkrate);
+sas_phy_linkerror_attr(invalid_dword_count);
+sas_phy_linkerror_attr(running_disparity_error_count);
+sas_phy_linkerror_attr(loss_of_dword_sync_count);
+sas_phy_linkerror_attr(phy_reset_problem_count);
+
+static int sas_phy_setup(struct transport_container *tc, struct device *dev,
+			 struct device *cdev)
+{
+	struct sas_phy *phy = dev_to_phy(dev);
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+	struct sas_internal *i = to_sas_internal(shost->transportt);
+
+	if (i->f->phy_setup)
+		i->f->phy_setup(phy);
+
+	return 0;
+}
+
+static DECLARE_TRANSPORT_CLASS(sas_phy_class,
+		"sas_phy", sas_phy_setup, NULL, NULL);
+
+static int sas_phy_match(struct attribute_container *cont, struct device *dev)
+{
+	struct Scsi_Host *shost;
+	struct sas_internal *i;
+
+	if (!scsi_is_sas_phy(dev))
+		return 0;
+	shost = dev_to_shost(dev->parent);
+
+	if (!shost->transportt)
+		return 0;
+	if (shost->transportt->host_attrs.ac.class !=
+			&sas_host_class.class)
+		return 0;
+
+	i = to_sas_internal(shost->transportt);
+	return &i->phy_attr_cont.ac == cont;
+}
+
+static void sas_phy_release(struct device *dev)
+{
+	struct sas_phy *phy = dev_to_phy(dev);
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+	struct sas_internal *i = to_sas_internal(shost->transportt);
+
+	if (i->f->phy_release)
+		i->f->phy_release(phy);
+	put_device(dev->parent);
+	kfree(phy);
+}
+
+/**
+ * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
+ * @parent:	Parent device
+ * @number:	Phy index
+ *
+ * Allocates an SAS PHY structure.  It will be added in the device tree
+ * below the device specified by @parent, which has to be either a Scsi_Host
+ * or sas_rphy.
+ *
+ * Returns:
+ *	SAS PHY allocated or %NULL if the allocation failed.
+ */
+struct sas_phy *sas_phy_alloc(struct device *parent, int number)
+{
+	struct Scsi_Host *shost = dev_to_shost(parent);
+	struct sas_phy *phy;
+
+	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return NULL;
+
+	phy->number = number;
+	phy->enabled = 1;
+
+	device_initialize(&phy->dev);
+	phy->dev.parent = get_device(parent);
+	phy->dev.release = sas_phy_release;
+	INIT_LIST_HEAD(&phy->port_siblings);
+	if (scsi_is_sas_expander_device(parent)) {
+		struct sas_rphy *rphy = dev_to_rphy(parent);
+		dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
+			rphy->scsi_target_id, number);
+	} else
+		dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
+
+	transport_setup_device(&phy->dev);
+
+	return phy;
+}
+EXPORT_SYMBOL(sas_phy_alloc);
+
+/**
+ * sas_phy_add  -  add a SAS PHY to the device hierarchy
+ * @phy:	The PHY to be added
+ *
+ * Publishes a SAS PHY to the rest of the system.
+ */
+int sas_phy_add(struct sas_phy *phy)
+{
+	int error;
+
+	error = device_add(&phy->dev);
+	if (!error) {
+		transport_add_device(&phy->dev);
+		transport_configure_device(&phy->dev);
+	}
+
+	return error;
+}
+EXPORT_SYMBOL(sas_phy_add);
+
+/**
+ * sas_phy_free  -  free a SAS PHY
+ * @phy:	SAS PHY to free
+ *
+ * Frees the specified SAS PHY.
+ *
+ * Note:
+ *   This function must only be called on a PHY that has not
+ *   successfully been added using sas_phy_add().
+ */
+void sas_phy_free(struct sas_phy *phy)
+{
+	transport_destroy_device(&phy->dev);
+	put_device(&phy->dev);
+}
+EXPORT_SYMBOL(sas_phy_free);
+
+/**
+ * sas_phy_delete  -  remove SAS PHY
+ * @phy:	SAS PHY to remove
+ *
+ * Removes the specified SAS PHY.  If the SAS PHY has an
+ * associated remote PHY it is removed before.
+ */
+void
+sas_phy_delete(struct sas_phy *phy)
+{
+	struct device *dev = &phy->dev;
+
+	/* this happens if the phy is still part of a port when deleted */
+	BUG_ON(!list_empty(&phy->port_siblings));
+
+	transport_remove_device(dev);
+	device_del(dev);
+	transport_destroy_device(dev);
+	put_device(dev);
+}
+EXPORT_SYMBOL(sas_phy_delete);
+
+/**
+ * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
+ * @dev:	device to check
+ *
+ * Returns:
+ *	%1 if the device represents a SAS PHY, %0 else
+ */
+int scsi_is_sas_phy(const struct device *dev)
+{
+	return dev->release == sas_phy_release;
+}
+EXPORT_SYMBOL(scsi_is_sas_phy);
+
+/*
+ * SAS Port attributes
+ */
+#define sas_port_show_simple(field, name, format_string, cast)		\
+static ssize_t								\
+show_sas_port_##name(struct device *dev, 				\
+		     struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_port *port = transport_class_to_sas_port(dev);	\
+									\
+	return snprintf(buf, 20, format_string, cast port->field);	\
+}
+
+#define sas_port_simple_attr(field, name, format_string, type)		\
+	sas_port_show_simple(field, name, format_string, (type))	\
+static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
+
+sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
+
+static DECLARE_TRANSPORT_CLASS(sas_port_class,
+			       "sas_port", NULL, NULL, NULL);
+
+static int sas_port_match(struct attribute_container *cont, struct device *dev)
+{
+	struct Scsi_Host *shost;
+	struct sas_internal *i;
+
+	if (!scsi_is_sas_port(dev))
+		return 0;
+	shost = dev_to_shost(dev->parent);
+
+	if (!shost->transportt)
+		return 0;
+	if (shost->transportt->host_attrs.ac.class !=
+			&sas_host_class.class)
+		return 0;
+
+	i = to_sas_internal(shost->transportt);
+	return &i->port_attr_cont.ac == cont;
+}
+
+
+static void sas_port_release(struct device *dev)
+{
+	struct sas_port *port = dev_to_sas_port(dev);
+
+	BUG_ON(!list_empty(&port->phy_list));
+
+	put_device(dev->parent);
+	kfree(port);
+}
+
+static void sas_port_create_link(struct sas_port *port,
+				 struct sas_phy *phy)
+{
+	int res;
+
+	res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
+				dev_name(&phy->dev));
+	if (res)
+		goto err;
+	res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
+	if (res)
+		goto err;
+	return;
+err:
+	printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
+	       __func__, res);
+}
+
+static void sas_port_delete_link(struct sas_port *port,
+				 struct sas_phy *phy)
+{
+	sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
+	sysfs_remove_link(&phy->dev.kobj, "port");
+}
+
+/** sas_port_alloc - allocate and initialize a SAS port structure
+ *
+ * @parent:	parent device
+ * @port_id:	port number
+ *
+ * Allocates a SAS port structure.  It will be added to the device tree
+ * below the device specified by @parent which must be either a Scsi_Host
+ * or a sas_expander_device.
+ *
+ * Returns %NULL on error
+ */
+struct sas_port *sas_port_alloc(struct device *parent, int port_id)
+{
+	struct Scsi_Host *shost = dev_to_shost(parent);
+	struct sas_port *port;
+
+	port = kzalloc(sizeof(*port), GFP_KERNEL);
+	if (!port)
+		return NULL;
+
+	port->port_identifier = port_id;
+
+	device_initialize(&port->dev);
+
+	port->dev.parent = get_device(parent);
+	port->dev.release = sas_port_release;
+
+	mutex_init(&port->phy_list_mutex);
+	INIT_LIST_HEAD(&port->phy_list);
+
+	if (scsi_is_sas_expander_device(parent)) {
+		struct sas_rphy *rphy = dev_to_rphy(parent);
+		dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
+			     rphy->scsi_target_id, port->port_identifier);
+	} else
+		dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
+			     port->port_identifier);
+
+	transport_setup_device(&port->dev);
+
+	return port;
+}
+EXPORT_SYMBOL(sas_port_alloc);
+
+/** sas_port_alloc_num - allocate and initialize a SAS port structure
+ *
+ * @parent:	parent device
+ *
+ * Allocates a SAS port structure and a number to go with it.  This
+ * interface is really for adapters where the port number has no
+ * meansing, so the sas class should manage them.  It will be added to
+ * the device tree below the device specified by @parent which must be
+ * either a Scsi_Host or a sas_expander_device.
+ *
+ * Returns %NULL on error
+ */
+struct sas_port *sas_port_alloc_num(struct device *parent)
+{
+	int index;
+	struct Scsi_Host *shost = dev_to_shost(parent);
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+	/* FIXME: use idr for this eventually */
+	mutex_lock(&sas_host->lock);
+	if (scsi_is_sas_expander_device(parent)) {
+		struct sas_rphy *rphy = dev_to_rphy(parent);
+		struct sas_expander_device *exp = rphy_to_expander_device(rphy);
+
+		index = exp->next_port_id++;
+	} else
+		index = sas_host->next_port_id++;
+	mutex_unlock(&sas_host->lock);
+	return sas_port_alloc(parent, index);
+}
+EXPORT_SYMBOL(sas_port_alloc_num);
+
+/**
+ * sas_port_add - add a SAS port to the device hierarchy
+ * @port:	port to be added
+ *
+ * publishes a port to the rest of the system
+ */
+int sas_port_add(struct sas_port *port)
+{
+	int error;
+
+	/* No phys should be added until this is made visible */
+	BUG_ON(!list_empty(&port->phy_list));
+
+	error = device_add(&port->dev);
+
+	if (error)
+		return error;
+
+	transport_add_device(&port->dev);
+	transport_configure_device(&port->dev);
+
+	return 0;
+}
+EXPORT_SYMBOL(sas_port_add);
+
+/**
+ * sas_port_free  -  free a SAS PORT
+ * @port:	SAS PORT to free
+ *
+ * Frees the specified SAS PORT.
+ *
+ * Note:
+ *   This function must only be called on a PORT that has not
+ *   successfully been added using sas_port_add().
+ */
+void sas_port_free(struct sas_port *port)
+{
+	transport_destroy_device(&port->dev);
+	put_device(&port->dev);
+}
+EXPORT_SYMBOL(sas_port_free);
+
+/**
+ * sas_port_delete  -  remove SAS PORT
+ * @port:	SAS PORT to remove
+ *
+ * Removes the specified SAS PORT.  If the SAS PORT has an
+ * associated phys, unlink them from the port as well.
+ */
+void sas_port_delete(struct sas_port *port)
+{
+	struct device *dev = &port->dev;
+	struct sas_phy *phy, *tmp_phy;
+
+	if (port->rphy) {
+		sas_rphy_delete(port->rphy);
+		port->rphy = NULL;
+	}
+
+	mutex_lock(&port->phy_list_mutex);
+	list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
+				 port_siblings) {
+		sas_port_delete_link(port, phy);
+		list_del_init(&phy->port_siblings);
+	}
+	mutex_unlock(&port->phy_list_mutex);
+
+	if (port->is_backlink) {
+		struct device *parent = port->dev.parent;
+
+		sysfs_remove_link(&port->dev.kobj, dev_name(parent));
+		port->is_backlink = 0;
+	}
+
+	transport_remove_device(dev);
+	device_del(dev);
+	transport_destroy_device(dev);
+	put_device(dev);
+}
+EXPORT_SYMBOL(sas_port_delete);
+
+/**
+ * scsi_is_sas_port -  check if a struct device represents a SAS port
+ * @dev:	device to check
+ *
+ * Returns:
+ *	%1 if the device represents a SAS Port, %0 else
+ */
+int scsi_is_sas_port(const struct device *dev)
+{
+	return dev->release == sas_port_release;
+}
+EXPORT_SYMBOL(scsi_is_sas_port);
+
+/**
+ * sas_port_get_phy - try to take a reference on a port member
+ * @port: port to check
+ */
+struct sas_phy *sas_port_get_phy(struct sas_port *port)
+{
+	struct sas_phy *phy;
+
+	mutex_lock(&port->phy_list_mutex);
+	if (list_empty(&port->phy_list))
+		phy = NULL;
+	else {
+		struct list_head *ent = port->phy_list.next;
+
+		phy = list_entry(ent, typeof(*phy), port_siblings);
+		get_device(&phy->dev);
+	}
+	mutex_unlock(&port->phy_list_mutex);
+
+	return phy;
+}
+EXPORT_SYMBOL(sas_port_get_phy);
+
+/**
+ * sas_port_add_phy - add another phy to a port to form a wide port
+ * @port:	port to add the phy to
+ * @phy:	phy to add
+ *
+ * When a port is initially created, it is empty (has no phys).  All
+ * ports must have at least one phy to operated, and all wide ports
+ * must have at least two.  The current code makes no difference
+ * between ports and wide ports, but the only object that can be
+ * connected to a remote device is a port, so ports must be formed on
+ * all devices with phys if they're connected to anything.
+ */
+void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
+{
+	mutex_lock(&port->phy_list_mutex);
+	if (unlikely(!list_empty(&phy->port_siblings))) {
+		/* make sure we're already on this port */
+		struct sas_phy *tmp;
+
+		list_for_each_entry(tmp, &port->phy_list, port_siblings)
+			if (tmp == phy)
+				break;
+		/* If this trips, you added a phy that was already
+		 * part of a different port */
+		if (unlikely(tmp != phy)) {
+			dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
+				   dev_name(&phy->dev));
+			BUG();
+		}
+	} else {
+		sas_port_create_link(port, phy);
+		list_add_tail(&phy->port_siblings, &port->phy_list);
+		port->num_phys++;
+	}
+	mutex_unlock(&port->phy_list_mutex);
+}
+EXPORT_SYMBOL(sas_port_add_phy);
+
+/**
+ * sas_port_delete_phy - remove a phy from a port or wide port
+ * @port:	port to remove the phy from
+ * @phy:	phy to remove
+ *
+ * This operation is used for tearing down ports again.  It must be
+ * done to every port or wide port before calling sas_port_delete.
+ */
+void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
+{
+	mutex_lock(&port->phy_list_mutex);
+	sas_port_delete_link(port, phy);
+	list_del_init(&phy->port_siblings);
+	port->num_phys--;
+	mutex_unlock(&port->phy_list_mutex);
+}
+EXPORT_SYMBOL(sas_port_delete_phy);
+
+void sas_port_mark_backlink(struct sas_port *port)
+{
+	int res;
+	struct device *parent = port->dev.parent->parent->parent;
+
+	if (port->is_backlink)
+		return;
+	port->is_backlink = 1;
+	res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
+				dev_name(parent));
+	if (res)
+		goto err;
+	return;
+err:
+	printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
+	       __func__, res);
+
+}
+EXPORT_SYMBOL(sas_port_mark_backlink);
+
+/*
+ * SAS remote PHY attributes.
+ */
+
+#define sas_rphy_show_simple(field, name, format_string, cast)		\
+static ssize_t								\
+show_sas_rphy_##name(struct device *dev, 				\
+		     struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
+									\
+	return snprintf(buf, 20, format_string, cast rphy->field);	\
+}
+
+#define sas_rphy_simple_attr(field, name, format_string, type)		\
+	sas_rphy_show_simple(field, name, format_string, (type))	\
+static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, 			\
+		show_sas_rphy_##name, NULL)
+
+#define sas_rphy_show_protocol(field, name)				\
+static ssize_t								\
+show_sas_rphy_##name(struct device *dev, 				\
+		     struct device_attribute *attr, char *buf)		\
+{									\
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
+									\
+	if (!rphy->field)					\
+		return snprintf(buf, 20, "none\n");			\
+	return get_sas_protocol_names(rphy->field, buf);	\
+}
+
+#define sas_rphy_protocol_attr(field, name)				\
+	sas_rphy_show_protocol(field, name)				\
+static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
+		show_sas_rphy_##name, NULL)
+
+static ssize_t
+show_sas_rphy_device_type(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);
+
+	if (!rphy->identify.device_type)
+		return snprintf(buf, 20, "none\n");
+	return get_sas_device_type_names(
+			rphy->identify.device_type, buf);
+}
+
+static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
+		show_sas_rphy_device_type, NULL);
+
+static ssize_t
+show_sas_rphy_enclosure_identifier(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);
+	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+	struct sas_internal *i = to_sas_internal(shost->transportt);
+	u64 identifier;
+	int error;
+
+	/*
+	 * Only devices behind an expander are supported, because the
+	 * enclosure identifier is a SMP feature.
+	 */
+	if (scsi_is_sas_phy_local(phy))
+		return -EINVAL;
+
+	error = i->f->get_enclosure_identifier(rphy, &identifier);
+	if (error)
+		return error;
+	return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
+}
+
+static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
+		show_sas_rphy_enclosure_identifier, NULL);
+
+static ssize_t
+show_sas_rphy_bay_identifier(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);
+	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
+	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+	struct sas_internal *i = to_sas_internal(shost->transportt);
+	int val;
+
+	if (scsi_is_sas_phy_local(phy))
+		return -EINVAL;
+
+	val = i->f->get_bay_identifier(rphy);
+	if (val < 0)
+		return val;
+	return sprintf(buf, "%d\n", val);
+}
+
+static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
+		show_sas_rphy_bay_identifier, NULL);
+
+sas_rphy_protocol_attr(identify.initiator_port_protocols,
+		initiator_port_protocols);
+sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
+sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
+		unsigned long long);
+sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
+
+/* only need 8 bytes of data plus header (4 or 8) */
+#define BUF_SIZE 64
+
+int sas_read_port_mode_page(struct scsi_device *sdev)
+{
+	char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+	struct scsi_mode_data mode_data;
+	int res, error;
+
+	if (!buffer)
+		return -ENOMEM;
+
+	res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
+			      &mode_data, NULL);
+
+	error = -EINVAL;
+	if (!scsi_status_is_good(res))
+		goto out;
+
+	msdata = buffer +  mode_data.header_length +
+		mode_data.block_descriptor_length;
+
+	if (msdata - buffer > BUF_SIZE - 8)
+		goto out;
+
+	error = 0;
+
+	rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
+	rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
+	rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
+
+ out:
+	kfree(buffer);
+	return error;
+}
+EXPORT_SYMBOL(sas_read_port_mode_page);
+
+static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
+			       "sas_end_device", NULL, NULL, NULL);
+
+#define sas_end_dev_show_simple(field, name, format_string, cast)	\
+static ssize_t								\
+show_sas_end_dev_##name(struct device *dev, 				\
+			struct device_attribute *attr, char *buf)	\
+{									\
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
+	struct sas_end_device *rdev = rphy_to_end_device(rphy);		\
+									\
+	return snprintf(buf, 20, format_string, cast rdev->field);	\
+}
+
+#define sas_end_dev_simple_attr(field, name, format_string, type)	\
+	sas_end_dev_show_simple(field, name, format_string, (type))	\
+static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, 			\
+		show_sas_end_dev_##name, NULL)
+
+sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
+sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
+			"%d\n", int);
+sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
+			"%d\n", int);
+sas_end_dev_simple_attr(tlr_supported, tlr_supported,
+			"%d\n", int);
+sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
+			"%d\n", int);
+
+static DECLARE_TRANSPORT_CLASS(sas_expander_class,
+			       "sas_expander", NULL, NULL, NULL);
+
+#define sas_expander_show_simple(field, name, format_string, cast)	\
+static ssize_t								\
+show_sas_expander_##name(struct device *dev, 				\
+			 struct device_attribute *attr, char *buf)	\
+{									\
+	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
+	struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
+									\
+	return snprintf(buf, 20, format_string, cast edev->field);	\
+}
+
+#define sas_expander_simple_attr(field, name, format_string, type)	\
+	sas_expander_show_simple(field, name, format_string, (type))	\
+static SAS_DEVICE_ATTR(expander, name, S_IRUGO, 			\
+		show_sas_expander_##name, NULL)
+
+sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
+sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
+sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
+sas_expander_simple_attr(component_vendor_id, component_vendor_id,
+			 "%s\n", char *);
+sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
+sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
+			 unsigned int);
+sas_expander_simple_attr(level, level, "%d\n", int);
+
+static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
+		"sas_device", NULL, NULL, NULL);
+
+static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
+{
+	struct Scsi_Host *shost;
+	struct sas_internal *i;
+
+	if (!scsi_is_sas_rphy(dev))
+		return 0;
+	shost = dev_to_shost(dev->parent->parent);
+
+	if (!shost->transportt)
+		return 0;
+	if (shost->transportt->host_attrs.ac.class !=
+			&sas_host_class.class)
+		return 0;
+
+	i = to_sas_internal(shost->transportt);
+	return &i->rphy_attr_cont.ac == cont;
+}
+
+static int sas_end_dev_match(struct attribute_container *cont,
+			     struct device *dev)
+{
+	struct Scsi_Host *shost;
+	struct sas_internal *i;
+	struct sas_rphy *rphy;
+
+	if (!scsi_is_sas_rphy(dev))
+		return 0;
+	shost = dev_to_shost(dev->parent->parent);
+	rphy = dev_to_rphy(dev);
+
+	if (!shost->transportt)
+		return 0;
+	if (shost->transportt->host_attrs.ac.class !=
+			&sas_host_class.class)
+		return 0;
+
+	i = to_sas_internal(shost->transportt);
+	return &i->end_dev_attr_cont.ac == cont &&
+		rphy->identify.device_type == SAS_END_DEVICE;
+}
+
+static int sas_expander_match(struct attribute_container *cont,
+			      struct device *dev)
+{
+	struct Scsi_Host *shost;
+	struct sas_internal *i;
+	struct sas_rphy *rphy;
+
+	if (!scsi_is_sas_rphy(dev))
+		return 0;
+	shost = dev_to_shost(dev->parent->parent);
+	rphy = dev_to_rphy(dev);
+
+	if (!shost->transportt)
+		return 0;
+	if (shost->transportt->host_attrs.ac.class !=
+			&sas_host_class.class)
+		return 0;
+
+	i = to_sas_internal(shost->transportt);
+	return &i->expander_attr_cont.ac == cont &&
+		(rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
+		 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
+}
+
+static void sas_expander_release(struct device *dev)
+{
+	struct sas_rphy *rphy = dev_to_rphy(dev);
+	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
+
+	if (rphy->q)
+		blk_cleanup_queue(rphy->q);
+
+	put_device(dev->parent);
+	kfree(edev);
+}
+
+static void sas_end_device_release(struct device *dev)
+{
+	struct sas_rphy *rphy = dev_to_rphy(dev);
+	struct sas_end_device *edev = rphy_to_end_device(rphy);
+
+	if (rphy->q)
+		blk_cleanup_queue(rphy->q);
+
+	put_device(dev->parent);
+	kfree(edev);
+}
+
+/**
+ * sas_rphy_initialize - common rphy intialization
+ * @rphy:	rphy to initialise
+ *
+ * Used by both sas_end_device_alloc() and sas_expander_alloc() to
+ * initialise the common rphy component of each.
+ */
+static void sas_rphy_initialize(struct sas_rphy *rphy)
+{
+	INIT_LIST_HEAD(&rphy->list);
+}
+
+/**
+ * sas_end_device_alloc - allocate an rphy for an end device
+ * @parent: which port
+ *
+ * Allocates an SAS remote PHY structure, connected to @parent.
+ *
+ * Returns:
+ *	SAS PHY allocated or %NULL if the allocation failed.
+ */
+struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
+{
+	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
+	struct sas_end_device *rdev;
+
+	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
+	if (!rdev) {
+		return NULL;
+	}
+
+	device_initialize(&rdev->rphy.dev);
+	rdev->rphy.dev.parent = get_device(&parent->dev);
+	rdev->rphy.dev.release = sas_end_device_release;
+	if (scsi_is_sas_expander_device(parent->dev.parent)) {
+		struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
+		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
+			     shost->host_no, rphy->scsi_target_id,
+			     parent->port_identifier);
+	} else
+		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
+			     shost->host_no, parent->port_identifier);
+	rdev->rphy.identify.device_type = SAS_END_DEVICE;
+	sas_rphy_initialize(&rdev->rphy);
+	transport_setup_device(&rdev->rphy.dev);
+
+	return &rdev->rphy;
+}
+EXPORT_SYMBOL(sas_end_device_alloc);
+
+/**
+ * sas_expander_alloc - allocate an rphy for an end device
+ * @parent: which port
+ * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
+ *
+ * Allocates an SAS remote PHY structure, connected to @parent.
+ *
+ * Returns:
+ *	SAS PHY allocated or %NULL if the allocation failed.
+ */
+struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
+				    enum sas_device_type type)
+{
+	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
+	struct sas_expander_device *rdev;
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+	BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
+	       type != SAS_FANOUT_EXPANDER_DEVICE);
+
+	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
+	if (!rdev) {
+		return NULL;
+	}
+
+	device_initialize(&rdev->rphy.dev);
+	rdev->rphy.dev.parent = get_device(&parent->dev);
+	rdev->rphy.dev.release = sas_expander_release;
+	mutex_lock(&sas_host->lock);
+	rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
+	mutex_unlock(&sas_host->lock);
+	dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
+		     shost->host_no, rdev->rphy.scsi_target_id);
+	rdev->rphy.identify.device_type = type;
+	sas_rphy_initialize(&rdev->rphy);
+	transport_setup_device(&rdev->rphy.dev);
+
+	return &rdev->rphy;
+}
+EXPORT_SYMBOL(sas_expander_alloc);
+
+/**
+ * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
+ * @rphy:	The remote PHY to be added
+ *
+ * Publishes a SAS remote PHY to the rest of the system.
+ */
+int sas_rphy_add(struct sas_rphy *rphy)
+{
+	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
+	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+	struct sas_identify *identify = &rphy->identify;
+	int error;
+
+	if (parent->rphy)
+		return -ENXIO;
+	parent->rphy = rphy;
+
+	error = device_add(&rphy->dev);
+	if (error)
+		return error;
+	transport_add_device(&rphy->dev);
+	transport_configure_device(&rphy->dev);
+	if (sas_bsg_initialize(shost, rphy))
+		printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
+
+
+	mutex_lock(&sas_host->lock);
+	list_add_tail(&rphy->list, &sas_host->rphy_list);
+	if (identify->device_type == SAS_END_DEVICE &&
+	    (identify->target_port_protocols &
+	     (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
+		rphy->scsi_target_id = sas_host->next_target_id++;
+	else if (identify->device_type == SAS_END_DEVICE)
+		rphy->scsi_target_id = -1;
+	mutex_unlock(&sas_host->lock);
+
+	if (identify->device_type == SAS_END_DEVICE &&
+	    rphy->scsi_target_id != -1) {
+		int lun;
+
+		if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
+			lun = SCAN_WILD_CARD;
+		else
+			lun = 0;
+
+		scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun, 0);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(sas_rphy_add);
+
+/**
+ * sas_rphy_free  -  free a SAS remote PHY
+ * @rphy: SAS remote PHY to free
+ *
+ * Frees the specified SAS remote PHY.
+ *
+ * Note:
+ *   This function must only be called on a remote
+ *   PHY that has not successfully been added using
+ *   sas_rphy_add() (or has been sas_rphy_remove()'d)
+ */
+void sas_rphy_free(struct sas_rphy *rphy)
+{
+	struct device *dev = &rphy->dev;
+	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+	mutex_lock(&sas_host->lock);
+	list_del(&rphy->list);
+	mutex_unlock(&sas_host->lock);
+
+	transport_destroy_device(dev);
+
+	put_device(dev);
+}
+EXPORT_SYMBOL(sas_rphy_free);
+
+/**
+ * sas_rphy_delete  -  remove and free SAS remote PHY
+ * @rphy:	SAS remote PHY to remove and free
+ *
+ * Removes the specified SAS remote PHY and frees it.
+ */
+void
+sas_rphy_delete(struct sas_rphy *rphy)
+{
+	sas_rphy_remove(rphy);
+	sas_rphy_free(rphy);
+}
+EXPORT_SYMBOL(sas_rphy_delete);
+
+/**
+ * sas_rphy_unlink  -  unlink SAS remote PHY
+ * @rphy:	SAS remote phy to unlink from its parent port
+ *
+ * Removes port reference to an rphy
+ */
+void sas_rphy_unlink(struct sas_rphy *rphy)
+{
+	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
+
+	parent->rphy = NULL;
+}
+EXPORT_SYMBOL(sas_rphy_unlink);
+
+/**
+ * sas_rphy_remove  -  remove SAS remote PHY
+ * @rphy:	SAS remote phy to remove
+ *
+ * Removes the specified SAS remote PHY.
+ */
+void
+sas_rphy_remove(struct sas_rphy *rphy)
+{
+	struct device *dev = &rphy->dev;
+
+	switch (rphy->identify.device_type) {
+	case SAS_END_DEVICE:
+		scsi_remove_target(dev);
+		break;
+	case SAS_EDGE_EXPANDER_DEVICE:
+	case SAS_FANOUT_EXPANDER_DEVICE:
+		sas_remove_children(dev);
+		break;
+	default:
+		break;
+	}
+
+	sas_rphy_unlink(rphy);
+	sas_bsg_remove(NULL, rphy);
+	transport_remove_device(dev);
+	device_del(dev);
+}
+EXPORT_SYMBOL(sas_rphy_remove);
+
+/**
+ * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
+ * @dev:	device to check
+ *
+ * Returns:
+ *	%1 if the device represents a SAS remote PHY, %0 else
+ */
+int scsi_is_sas_rphy(const struct device *dev)
+{
+	return dev->release == sas_end_device_release ||
+		dev->release == sas_expander_release;
+}
+EXPORT_SYMBOL(scsi_is_sas_rphy);
+
+
+/*
+ * SCSI scan helper
+ */
+
+static int sas_user_scan(struct Scsi_Host *shost, uint channel,
+		uint id, u64 lun)
+{
+	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+	struct sas_rphy *rphy;
+
+	mutex_lock(&sas_host->lock);
+	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
+		if (rphy->identify.device_type != SAS_END_DEVICE ||
+		    rphy->scsi_target_id == -1)
+			continue;
+
+		if ((channel == SCAN_WILD_CARD || channel == 0) &&
+		    (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
+			scsi_scan_target(&rphy->dev, 0,
+					 rphy->scsi_target_id, lun, 1);
+		}
+	}
+	mutex_unlock(&sas_host->lock);
+
+	return 0;
+}
+
+
+/*
+ * Setup / Teardown code
+ */
+
+#define SETUP_TEMPLATE(attrb, field, perm, test)			\
+	i->private_##attrb[count] = dev_attr_##field;		\
+	i->private_##attrb[count].attr.mode = perm;			\
+	i->attrb[count] = &i->private_##attrb[count];			\
+	if (test)							\
+		count++
+
+#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)	\
+	i->private_##attrb[count] = dev_attr_##field;		\
+	i->private_##attrb[count].attr.mode = perm;			\
+	if (ro_test) {							\
+		i->private_##attrb[count].attr.mode = ro_perm;		\
+		i->private_##attrb[count].store = NULL;			\
+	}								\
+	i->attrb[count] = &i->private_##attrb[count];			\
+	if (test)							\
+		count++
+
+#define SETUP_RPORT_ATTRIBUTE(field) 					\
+	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
+
+#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)			\
+	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
+
+#define SETUP_PHY_ATTRIBUTE(field)					\
+	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
+
+#define SETUP_PHY_ATTRIBUTE_RW(field)					\
+	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
+			!i->f->set_phy_speed, S_IRUGO)
+
+#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)			\
+	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
+			  !i->f->func, S_IRUGO)
+
+#define SETUP_PORT_ATTRIBUTE(field)					\
+	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
+
+#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)			\
+	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
+
+#define SETUP_PHY_ATTRIBUTE_WRONLY(field)				\
+	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
+
+#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)		\
+	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
+
+#define SETUP_END_DEV_ATTRIBUTE(field)					\
+	SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
+
+#define SETUP_EXPANDER_ATTRIBUTE(field)					\
+	SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
+
+/**
+ * sas_attach_transport  -  instantiate SAS transport template
+ * @ft:		SAS transport class function template
+ */
+struct scsi_transport_template *
+sas_attach_transport(struct sas_function_template *ft)
+{
+	struct sas_internal *i;
+	int count;
+
+	i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
+	if (!i)
+		return NULL;
+
+	i->t.user_scan = sas_user_scan;
+
+	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
+	i->t.host_attrs.ac.class = &sas_host_class.class;
+	i->t.host_attrs.ac.match = sas_host_match;
+	transport_container_register(&i->t.host_attrs);
+	i->t.host_size = sizeof(struct sas_host_attrs);
+
+	i->phy_attr_cont.ac.class = &sas_phy_class.class;
+	i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
+	i->phy_attr_cont.ac.match = sas_phy_match;
+	transport_container_register(&i->phy_attr_cont);
+
+	i->port_attr_cont.ac.class = &sas_port_class.class;
+	i->port_attr_cont.ac.attrs = &i->port_attrs[0];
+	i->port_attr_cont.ac.match = sas_port_match;
+	transport_container_register(&i->port_attr_cont);
+
+	i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
+	i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
+	i->rphy_attr_cont.ac.match = sas_rphy_match;
+	transport_container_register(&i->rphy_attr_cont);
+
+	i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
+	i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
+	i->end_dev_attr_cont.ac.match = sas_end_dev_match;
+	transport_container_register(&i->end_dev_attr_cont);
+
+	i->expander_attr_cont.ac.class = &sas_expander_class.class;
+	i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
+	i->expander_attr_cont.ac.match = sas_expander_match;
+	transport_container_register(&i->expander_attr_cont);
+
+	i->f = ft;
+
+	count = 0;
+	SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
+	SETUP_PHY_ATTRIBUTE(target_port_protocols);
+	SETUP_PHY_ATTRIBUTE(device_type);
+	SETUP_PHY_ATTRIBUTE(sas_address);
+	SETUP_PHY_ATTRIBUTE(phy_identifier);
+	//SETUP_PHY_ATTRIBUTE(port_identifier);
+	SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
+	SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
+	SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
+	SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
+	SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
+
+	SETUP_PHY_ATTRIBUTE(invalid_dword_count);
+	SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
+	SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
+	SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
+	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
+	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
+	SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
+	i->phy_attrs[count] = NULL;
+
+	count = 0;
+	SETUP_PORT_ATTRIBUTE(num_phys);
+	i->port_attrs[count] = NULL;
+
+	count = 0;
+	SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
+	SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
+	SETUP_RPORT_ATTRIBUTE(rphy_device_type);
+	SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
+	SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
+	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
+				       get_enclosure_identifier);
+	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
+				       get_bay_identifier);
+	i->rphy_attrs[count] = NULL;
+
+	count = 0;
+	SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
+	SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
+	SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
+	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
+	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
+	i->end_dev_attrs[count] = NULL;
+
+	count = 0;
+	SETUP_EXPANDER_ATTRIBUTE(vendor_id);
+	SETUP_EXPANDER_ATTRIBUTE(product_id);
+	SETUP_EXPANDER_ATTRIBUTE(product_rev);
+	SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
+	SETUP_EXPANDER_ATTRIBUTE(component_id);
+	SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
+	SETUP_EXPANDER_ATTRIBUTE(level);
+	i->expander_attrs[count] = NULL;
+
+	return &i->t;
+}
+EXPORT_SYMBOL(sas_attach_transport);
+
+/**
+ * sas_release_transport  -  release SAS transport template instance
+ * @t:		transport template instance
+ */
+void sas_release_transport(struct scsi_transport_template *t)
+{
+	struct sas_internal *i = to_sas_internal(t);
+
+	transport_container_unregister(&i->t.host_attrs);
+	transport_container_unregister(&i->phy_attr_cont);
+	transport_container_unregister(&i->port_attr_cont);
+	transport_container_unregister(&i->rphy_attr_cont);
+	transport_container_unregister(&i->end_dev_attr_cont);
+	transport_container_unregister(&i->expander_attr_cont);
+
+	kfree(i);
+}
+EXPORT_SYMBOL(sas_release_transport);
+
+static __init int sas_transport_init(void)
+{
+	int error;
+
+	error = transport_class_register(&sas_host_class);
+	if (error)
+		goto out;
+	error = transport_class_register(&sas_phy_class);
+	if (error)
+		goto out_unregister_transport;
+	error = transport_class_register(&sas_port_class);
+	if (error)
+		goto out_unregister_phy;
+	error = transport_class_register(&sas_rphy_class);
+	if (error)
+		goto out_unregister_port;
+	error = transport_class_register(&sas_end_dev_class);
+	if (error)
+		goto out_unregister_rphy;
+	error = transport_class_register(&sas_expander_class);
+	if (error)
+		goto out_unregister_end_dev;
+
+	return 0;
+
+ out_unregister_end_dev:
+	transport_class_unregister(&sas_end_dev_class);
+ out_unregister_rphy:
+	transport_class_unregister(&sas_rphy_class);
+ out_unregister_port:
+	transport_class_unregister(&sas_port_class);
+ out_unregister_phy:
+	transport_class_unregister(&sas_phy_class);
+ out_unregister_transport:
+	transport_class_unregister(&sas_host_class);
+ out:
+	return error;
+
+}
+
+static void __exit sas_transport_exit(void)
+{
+	transport_class_unregister(&sas_host_class);
+	transport_class_unregister(&sas_phy_class);
+	transport_class_unregister(&sas_port_class);
+	transport_class_unregister(&sas_rphy_class);
+	transport_class_unregister(&sas_end_dev_class);
+	transport_class_unregister(&sas_expander_class);
+}
+
+MODULE_AUTHOR("Christoph Hellwig");
+MODULE_DESCRIPTION("SAS Transport Attributes");
+MODULE_LICENSE("GPL");
+
+module_init(sas_transport_init);
+module_exit(sas_transport_exit);