scsi_transport_sas.c 45.0 KB
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/*
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 * Copyright (C) 2005-2006 Dell Inc.
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 *	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 managment
 * 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>
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#include <linux/jiffies.h>
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#include <linux/err.h>
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#include <linux/slab.h>
#include <linux/string.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>

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#include "scsi_sas_internal.h"
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struct sas_host_attrs {
	struct list_head rphy_list;
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	struct mutex lock;
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	u32 next_target_id;
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	u32 next_expander_id;
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	int next_port_id;
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};
#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_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
	struct class_device_attribute class_device_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;							\
								\
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	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
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		if (table[i].value & table_key) {		\
			len += sprintf(buf + len, "%s%s",	\
				prefix, table[i].name);		\
			prefix = ", ";				\
		}						\
	}							\
	len += sprintf(buf + len, "\n");			\
	return len;						\
}

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#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;						\
}

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#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;							\
								\
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	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
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		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" },
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	{ SAS_LINK_RATE_6_0_GBPS,	"6.0 Gbit" },
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};
sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
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sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
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/*
 * SAS host attributes
 */

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static int sas_host_setup(struct transport_container *tc, struct device *dev,
			  struct class_device *cdev)
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{
	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);
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	mutex_init(&sas_host->lock);
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	sas_host->next_target_id = 0;
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	sas_host->next_expander_id = 0;
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	sas_host->next_port_id = 0;
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	return 0;
}

static DECLARE_TRANSPORT_CLASS(sas_host_class,
		"sas_host", sas_host_setup, NULL, 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)
{
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	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))
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		sas_phy_delete(dev_to_phy(dev));
	return 0;
}

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/**
 * 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);

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/**
 * 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)
{
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	sas_remove_children(&shost->shost_gendev);
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}
EXPORT_SYMBOL(sas_remove_host);


/*
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 * SAS Phy attributes
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 */

#define sas_phy_show_simple(field, name, format_string, cast)		\
static ssize_t								\
show_sas_phy_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
									\
	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 CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
									\
	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 CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)

#define sas_phy_show_linkspeed(field)					\
static ssize_t								\
show_sas_phy_##field(struct class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
									\
	return get_sas_linkspeed_names(phy->field, buf);		\
}

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/* Fudge to tell if we're minimum or maximum */
#define sas_phy_store_linkspeed(field)					\
static ssize_t								\
store_sas_phy_##field(struct class_device *cdev, const char *buf,	\
		      size_t count)					\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
	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 CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,		\
	store_sas_phy_##field)

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#define sas_phy_linkspeed_attr(field)					\
	sas_phy_show_linkspeed(field)					\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)

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#define sas_phy_show_linkerror(field)					\
static ssize_t								\
show_sas_phy_##field(struct class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
	struct sas_internal *i = to_sas_internal(shost->transportt);	\
	int error;							\
									\
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	error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
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	if (error)							\
		return error;						\
	return snprintf(buf, 20, "%u\n", phy->field);			\
}

#define sas_phy_linkerror_attr(field)					\
	sas_phy_show_linkerror(field)					\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)


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static ssize_t
show_sas_device_type(struct class_device *cdev, char *buf)
{
	struct sas_phy *phy = transport_class_to_phy(cdev);

	if (!phy->identify.device_type)
		return snprintf(buf, 20, "none\n");
	return get_sas_device_type_names(phy->identify.device_type, buf);
}
static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);

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static ssize_t do_sas_phy_enable(struct class_device *cdev,
		size_t count, int enable)
{
	struct sas_phy *phy = transport_class_to_phy(cdev);
	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 class_device *cdev,
		const char *buf, size_t count)
{
	if (count < 1)
		return -EINVAL;

	switch (buf[0]) {
	case '0':
		do_sas_phy_enable(cdev, count, 0);
		break;
	case '1':
		do_sas_phy_enable(cdev, count, 1);
		break;
	default:
		return -EINVAL;
	}

	return count;
}

static ssize_t show_sas_phy_enable(struct class_device *cdev, char *buf)
{
	struct sas_phy *phy = transport_class_to_phy(cdev);

	return snprintf(buf, 20, "%d", phy->enabled);
}

static CLASS_DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
			 store_sas_phy_enable);

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static ssize_t do_sas_phy_reset(struct class_device *cdev,
		size_t count, int hard_reset)
{
	struct sas_phy *phy = transport_class_to_phy(cdev);
	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;
	return count;
};

static ssize_t store_sas_link_reset(struct class_device *cdev,
		const char *buf, size_t count)
{
	return do_sas_phy_reset(cdev, count, 0);
}
static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);

static ssize_t store_sas_hard_reset(struct class_device *cdev,
		const char *buf, size_t count)
{
	return do_sas_phy_reset(cdev, count, 1);
}
static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);

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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);
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//sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
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sas_phy_linkspeed_attr(negotiated_linkrate);
sas_phy_linkspeed_attr(minimum_linkrate_hw);
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sas_phy_linkspeed_rw_attr(minimum_linkrate);
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sas_phy_linkspeed_attr(maximum_linkrate_hw);
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sas_phy_linkspeed_rw_attr(maximum_linkrate);
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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);
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static DECLARE_TRANSPORT_CLASS(sas_phy_class,
		"sas_phy", NULL, 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);

	put_device(dev->parent);
	kfree(phy);
}

/**
 * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
 * @parent:	Parent device
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 * @number:	Phy index
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 *
 * 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;

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	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
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	if (!phy)
		return NULL;

	phy->number = number;
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	phy->enabled = 1;
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	device_initialize(&phy->dev);
	phy->dev.parent = get_device(parent);
	phy->dev.release = sas_phy_release;
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	INIT_LIST_HEAD(&phy->port_siblings);
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	if (scsi_is_sas_expander_device(parent)) {
		struct sas_rphy *rphy = dev_to_rphy(parent);
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		sprintf(phy->dev.bus_id, "phy-%d:%d:%d", shost->host_no,
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			rphy->scsi_target_id, number);
	} else
		sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
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	transport_setup_device(&phy->dev);

	return phy;
}
EXPORT_SYMBOL(sas_phy_alloc);

/**
 * sas_phy_add  --  add a SAS PHY to the device hierachy
 * @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
 *   sucessfully been added using sas_phy_add().
 */
void sas_phy_free(struct sas_phy *phy)
{
	transport_destroy_device(&phy->dev);
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	put_device(&phy->dev);
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}
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;

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	/* this happens if the phy is still part of a port when deleted */
	BUG_ON(!list_empty(&phy->port_siblings));
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	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
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	put_device(dev);
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}
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);

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/*
 * SAS Port attributes
 */
#define sas_port_show_simple(field, name, format_string, cast)		\
static ssize_t								\
show_sas_port_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_port *port = transport_class_to_sas_port(cdev);	\
									\
	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 CLASS_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)
{
	sysfs_create_link(&port->dev.kobj, &phy->dev.kobj, phy->dev.bus_id);
	sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
}

static void sas_port_delete_link(struct sas_port *port,
				 struct sas_phy *phy)
{
	sysfs_remove_link(&port->dev.kobj, phy->dev.bus_id);
	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);
		sprintf(port->dev.bus_id, "port-%d:%d:%d", shost->host_no,
			rphy->scsi_target_id, port->port_identifier);
	} else
		sprintf(port->dev.bus_id, "port-%d:%d", shost->host_no,
			port->port_identifier);

	transport_setup_device(&port->dev);

	return port;
}
EXPORT_SYMBOL(sas_port_alloc);

683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
/** 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);

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/**
 * 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
 *   sucessfully 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);

783 784 785 786 787 788 789
	if (port->is_backlink) {
		struct device *parent = port->dev.parent;

		sysfs_remove_link(&port->dev.kobj, parent->bus_id);
		port->is_backlink = 0;
	}

790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864
	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_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", phy->dev.bus_id);
			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);

865 866 867 868 869 870 871 872 873 874 875 876 877
void sas_port_mark_backlink(struct sas_port *port)
{
	struct device *parent = port->dev.parent->parent->parent;

	if (port->is_backlink)
		return;
	port->is_backlink = 1;
	sysfs_create_link(&port->dev.kobj, &parent->kobj,
			  parent->bus_id);

}
EXPORT_SYMBOL(sas_port_mark_backlink);

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/*
 * SAS remote PHY attributes.
 */

#define sas_rphy_show_simple(field, name, format_string, cast)		\
static ssize_t								\
show_sas_rphy_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);	\
									\
	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_CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);	\
									\
	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_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
		show_sas_rphy_##name, NULL)

static ssize_t
show_sas_rphy_device_type(struct class_device *cdev, char *buf)
{
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);

	if (!rphy->identify.device_type)
		return snprintf(buf, 20, "none\n");
	return get_sas_device_type_names(
			rphy->identify.device_type, buf);
}

static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
		show_sas_rphy_device_type, NULL);

926 927 928 929 930 931 932 933 934 935 936 937 938 939
static ssize_t
show_sas_rphy_enclosure_identifier(struct class_device *cdev, char *buf)
{
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);
	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.
	 */
940
	if (scsi_is_sas_phy_local(phy))
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
		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_CLASS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
		show_sas_rphy_enclosure_identifier, NULL);

static ssize_t
show_sas_rphy_bay_identifier(struct class_device *cdev, char *buf)
{
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);
	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;

961
	if (scsi_is_sas_phy_local(phy))
962 963 964 965 966 967 968 969 970 971 972
		return -EINVAL;

	val = i->f->get_bay_identifier(rphy);
	if (val < 0)
		return val;
	return sprintf(buf, "%d\n", val);
}

static SAS_CLASS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
		show_sas_rphy_bay_identifier, NULL);

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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);

980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
/* 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_rphy *rphy = target_to_rphy(sdev->sdev_target);
	struct sas_end_device *rdev;
	struct scsi_mode_data mode_data;
	int res, error;

	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);

	rdev = rphy_to_end_device(rphy);

	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);

1023 1024 1025
static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
			       "sas_end_device", NULL, NULL, NULL);

1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
#define sas_end_dev_show_simple(field, name, format_string, cast)	\
static ssize_t								\
show_sas_end_dev_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);		\
	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_CLASS_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);

1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073
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 class_device *cdev, char *buf)		\
{									\
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);		\
	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_CLASS_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);
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Christoph Hellwig 已提交
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static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
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		"sas_device", NULL, NULL, NULL);
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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;
}

1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
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 &&
1117
		rphy->identify.device_type == SAS_END_DEVICE;
1118 1119
}

1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
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 ||
1141
		 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1142 1143
}

1144
static void sas_expander_release(struct device *dev)
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Christoph Hellwig 已提交
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{
	struct sas_rphy *rphy = dev_to_rphy(dev);
1147
	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
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	put_device(dev->parent);
1150
	kfree(edev);
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}

1153
static void sas_end_device_release(struct device *dev)
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{
1155 1156
	struct sas_rphy *rphy = dev_to_rphy(dev);
	struct sas_end_device *edev = rphy_to_end_device(rphy);
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1158 1159
	put_device(dev->parent);
	kfree(edev);
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}

1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
/**
 * 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);
}

1174 1175 1176 1177 1178 1179 1180 1181
/**
 * sas_end_device_alloc - allocate an rphy for an end device
 *
 * Allocates an SAS remote PHY structure, connected to @parent.
 *
 * Returns:
 *	SAS PHY allocated or %NULL if the allocation failed.
 */
1182
struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
{
	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);
1194
	rdev->rphy.dev.release = sas_end_device_release;
1195 1196 1197 1198 1199 1200 1201
	if (scsi_is_sas_expander_device(parent->dev.parent)) {
		struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
		sprintf(rdev->rphy.dev.bus_id, "end_device-%d:%d:%d",
			shost->host_no, rphy->scsi_target_id, parent->port_identifier);
	} else
		sprintf(rdev->rphy.dev.bus_id, "end_device-%d:%d",
			shost->host_no, parent->port_identifier);
1202
	rdev->rphy.identify.device_type = SAS_END_DEVICE;
1203
	sas_rphy_initialize(&rdev->rphy);
1204 1205 1206 1207 1208 1209
	transport_setup_device(&rdev->rphy.dev);

	return &rdev->rphy;
}
EXPORT_SYMBOL(sas_end_device_alloc);

1210 1211 1212 1213 1214 1215 1216 1217
/**
 * sas_expander_alloc - allocate an rphy for an end device
 *
 * Allocates an SAS remote PHY structure, connected to @parent.
 *
 * Returns:
 *	SAS PHY allocated or %NULL if the allocation failed.
 */
1218
struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
				    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);
1235
	rdev->rphy.dev.release = sas_expander_release;
1236 1237 1238 1239 1240 1241
	mutex_lock(&sas_host->lock);
	rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
	mutex_unlock(&sas_host->lock);
	sprintf(rdev->rphy.dev.bus_id, "expander-%d:%d",
		shost->host_no, rdev->rphy.scsi_target_id);
	rdev->rphy.identify.device_type = type;
1242
	sas_rphy_initialize(&rdev->rphy);
1243 1244 1245 1246 1247
	transport_setup_device(&rdev->rphy.dev);

	return &rdev->rphy;
}
EXPORT_SYMBOL(sas_expander_alloc);
1248

C
Christoph Hellwig 已提交
1249 1250 1251 1252 1253 1254 1255 1256
/**
 * sas_rphy_add  --  add a SAS remote PHY to the device hierachy
 * @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)
{
1257
	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
C
Christoph Hellwig 已提交
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
	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);

1273
	mutex_lock(&sas_host->lock);
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Christoph Hellwig 已提交
1274 1275 1276 1277 1278
	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++;
1279 1280
	else if (identify->device_type == SAS_END_DEVICE)
		rphy->scsi_target_id = -1;
1281
	mutex_unlock(&sas_host->lock);
C
Christoph Hellwig 已提交
1282

1283 1284
	if (identify->device_type == SAS_END_DEVICE &&
	    rphy->scsi_target_id != -1) {
1285
		scsi_scan_target(&rphy->dev, 0,
1286
				rphy->scsi_target_id, SCAN_WILD_CARD, 0);
C
Christoph Hellwig 已提交
1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301
	}

	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 sucessfully been added using
1302
 *   sas_rphy_add() (or has been sas_rphy_remove()'d)
C
Christoph Hellwig 已提交
1303 1304 1305
 */
void sas_rphy_free(struct sas_rphy *rphy)
{
1306
	struct device *dev = &rphy->dev;
C
Christoph Hellwig 已提交
1307 1308 1309
	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);

1310
	mutex_lock(&sas_host->lock);
C
Christoph Hellwig 已提交
1311
	list_del(&rphy->list);
1312
	mutex_unlock(&sas_host->lock);
C
Christoph Hellwig 已提交
1313

1314
	transport_destroy_device(dev);
1315

1316
	put_device(dev);
C
Christoph Hellwig 已提交
1317 1318 1319 1320
}
EXPORT_SYMBOL(sas_rphy_free);

/**
1321 1322
 * sas_rphy_delete  --  remove and free SAS remote PHY
 * @rphy:	SAS remote PHY to remove and free
C
Christoph Hellwig 已提交
1323
 *
1324
 * Removes the specified SAS remote PHY and frees it.
C
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 */
void
sas_rphy_delete(struct sas_rphy *rphy)
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
{
	sas_rphy_remove(rphy);
	sas_rphy_free(rphy);
}
EXPORT_SYMBOL(sas_rphy_delete);

/**
 * 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)
C
Christoph Hellwig 已提交
1342 1343
{
	struct device *dev = &rphy->dev;
1344
	struct sas_port *parent = dev_to_sas_port(dev->parent);
C
Christoph Hellwig 已提交
1345

1346 1347 1348 1349 1350 1351
	switch (rphy->identify.device_type) {
	case SAS_END_DEVICE:
		scsi_remove_target(dev);
		break;
	case SAS_EDGE_EXPANDER_DEVICE:
	case SAS_FANOUT_EXPANDER_DEVICE:
1352
		sas_remove_children(dev);
1353 1354 1355 1356
		break;
	default:
		break;
	}
C
Christoph Hellwig 已提交
1357

1358 1359
	transport_remove_device(dev);
	device_del(dev);
C
Christoph Hellwig 已提交
1360

1361
	parent->rphy = NULL;
C
Christoph Hellwig 已提交
1362
}
1363
EXPORT_SYMBOL(sas_rphy_remove);
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Christoph Hellwig 已提交
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373

/**
 * 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)
{
1374 1375
	return dev->release == sas_end_device_release ||
		dev->release == sas_expander_release;
C
Christoph Hellwig 已提交
1376 1377 1378 1379 1380 1381 1382 1383
}
EXPORT_SYMBOL(scsi_is_sas_rphy);


/*
 * SCSI scan helper
 */

1384 1385
static int sas_user_scan(struct Scsi_Host *shost, uint channel,
		uint id, uint lun)
C
Christoph Hellwig 已提交
1386 1387 1388 1389
{
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
	struct sas_rphy *rphy;

1390
	mutex_lock(&sas_host->lock);
C
Christoph Hellwig 已提交
1391
	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1392 1393
		if (rphy->identify.device_type != SAS_END_DEVICE ||
		    rphy->scsi_target_id == -1)
1394 1395
			continue;

1396
		if ((channel == SCAN_WILD_CARD || channel == 0) &&
1397
		    (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1398
			scsi_scan_target(&rphy->dev, 0,
1399 1400
					 rphy->scsi_target_id, lun, 1);
		}
C
Christoph Hellwig 已提交
1401
	}
1402
	mutex_unlock(&sas_host->lock);
C
Christoph Hellwig 已提交
1403

1404
	return 0;
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1405 1406 1407 1408 1409 1410 1411
}


/*
 * Setup / Teardown code
 */

1412
#define SETUP_TEMPLATE(attrb, field, perm, test)			\
1413 1414 1415 1416 1417 1418
	i->private_##attrb[count] = class_device_attr_##field;		\
	i->private_##attrb[count].attr.mode = perm;			\
	i->attrb[count] = &i->private_##attrb[count];			\
	if (test)							\
		count++

1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
#define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)	\
	i->private_##attrb[count] = class_device_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++
1429 1430 1431

#define SETUP_RPORT_ATTRIBUTE(field) 					\
	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
C
Christoph Hellwig 已提交
1432

1433
#define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)			\
1434
	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1435

1436
#define SETUP_PHY_ATTRIBUTE(field)					\
1437
	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
C
Christoph Hellwig 已提交
1438

1439 1440 1441 1442
#define SETUP_PHY_ATTRIBUTE_RW(field)					\
	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
			!i->f->set_phy_speed, S_IRUGO)

1443 1444 1445 1446
#define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)			\
	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
			  !i->f->func, S_IRUGO)

1447 1448 1449 1450
#define SETUP_PORT_ATTRIBUTE(field)					\
	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)

#define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)			\
1451
	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1452

1453
#define SETUP_PHY_ATTRIBUTE_WRONLY(field)				\
1454
	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1455

1456
#define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)		\
1457
	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1458

1459 1460
#define SETUP_END_DEV_ATTRIBUTE(field)					\
	SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
C
Christoph Hellwig 已提交
1461

1462 1463 1464
#define SETUP_EXPANDER_ATTRIBUTE(field)					\
	SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)

C
Christoph Hellwig 已提交
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
/**
 * 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;

J
Jes Sorensen 已提交
1475
	i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
C
Christoph Hellwig 已提交
1476 1477 1478
	if (!i)
		return NULL;

1479
	i->t.user_scan = sas_user_scan;
C
Christoph Hellwig 已提交
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491

	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);

1492 1493 1494 1495 1496
	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);

C
Christoph Hellwig 已提交
1497 1498 1499 1500 1501
	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);

1502 1503 1504 1505 1506
	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);

1507 1508 1509 1510 1511
	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);

C
Christoph Hellwig 已提交
1512 1513 1514
	i->f = ft;

	count = 0;
1515
	SETUP_PORT_ATTRIBUTE(num_phys);
C
Christoph Hellwig 已提交
1516 1517 1518
	i->host_attrs[count] = NULL;

	count = 0;
1519 1520 1521 1522 1523 1524 1525 1526
	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);
1527
	SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1528
	SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1529
	SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1530 1531 1532 1533 1534 1535 1536

	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);
1537
	SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
C
Christoph Hellwig 已提交
1538 1539
	i->phy_attrs[count] = NULL;

1540 1541 1542 1543
	count = 0;
	SETUP_PORT_ATTRIBUTE(num_phys);
	i->port_attrs[count] = NULL;

C
Christoph Hellwig 已提交
1544 1545 1546 1547 1548 1549
	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);
1550 1551 1552 1553
	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
				       get_enclosure_identifier);
	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
				       get_bay_identifier);
C
Christoph Hellwig 已提交
1554 1555
	i->rphy_attrs[count] = NULL;

1556 1557 1558 1559 1560 1561
	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);
	i->end_dev_attrs[count] = NULL;

1562 1563 1564 1565 1566 1567 1568 1569 1570 1571
	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;

C
Christoph Hellwig 已提交
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
	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);
1586
	transport_container_unregister(&i->port_attr_cont);
C
Christoph Hellwig 已提交
1587
	transport_container_unregister(&i->rphy_attr_cont);
1588
	transport_container_unregister(&i->end_dev_attr_cont);
1589
	transport_container_unregister(&i->expander_attr_cont);
C
Christoph Hellwig 已提交
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604

	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;
1605
	error = transport_class_register(&sas_port_class);
C
Christoph Hellwig 已提交
1606 1607
	if (error)
		goto out_unregister_phy;
1608 1609 1610
	error = transport_class_register(&sas_rphy_class);
	if (error)
		goto out_unregister_port;
1611 1612 1613
	error = transport_class_register(&sas_end_dev_class);
	if (error)
		goto out_unregister_rphy;
1614 1615 1616
	error = transport_class_register(&sas_expander_class);
	if (error)
		goto out_unregister_end_dev;
C
Christoph Hellwig 已提交
1617 1618 1619

	return 0;

1620 1621
 out_unregister_end_dev:
	transport_class_unregister(&sas_end_dev_class);
1622 1623
 out_unregister_rphy:
	transport_class_unregister(&sas_rphy_class);
1624 1625
 out_unregister_port:
	transport_class_unregister(&sas_port_class);
C
Christoph Hellwig 已提交
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638
 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);
1639
	transport_class_unregister(&sas_port_class);
C
Christoph Hellwig 已提交
1640
	transport_class_unregister(&sas_rphy_class);
1641
	transport_class_unregister(&sas_end_dev_class);
1642
	transport_class_unregister(&sas_expander_class);
C
Christoph Hellwig 已提交
1643 1644 1645
}

MODULE_AUTHOR("Christoph Hellwig");
1646
MODULE_DESCRIPTION("SAS Transport Attributes");
C
Christoph Hellwig 已提交
1647 1648 1649 1650
MODULE_LICENSE("GPL");

module_init(sas_transport_init);
module_exit(sas_transport_exit);