[SCSI] libsas: Add a sysfs knob to enable/disable a phy

This patch lets a user arbitrarily enable or disable a phy via sysfs.
Potential applications include shutting down a phy to replace one
lane of wide port, and (more importantly) providing a method for the
libata SATL to control the phy.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/libsas/sas_init.c

@@ -146,6 +146,36 @@ static int sas_get_linkerrors(struct sas_phy *phy)
 	return sas_smp_get_phy_events(phy);
 }
 
+int sas_phy_enable(struct sas_phy *phy, int enable)
+{
+	int ret;
+	enum phy_func command;
+
+	if (enable)
+		command = PHY_FUNC_LINK_RESET;
+	else
+		command = PHY_FUNC_DISABLE;
+
+	if (scsi_is_sas_phy_local(phy)) {
+		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
+		struct sas_internal *i =
+			to_sas_internal(sas_ha->core.shost->transportt);
+
+		if (!enable) {
+			sas_phy_disconnected(asd_phy);
+			sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
+		}
+		ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
+	} else {
+		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
+		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
+		ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
+	}
+	return ret;
+}
+
 int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 {
 	int ret;
@@ -172,7 +202,7 @@ int sas_phy_reset(struct sas_phy *phy, int hard_reset)
 	return ret;
 }
 
-static int sas_set_phy_speed(struct sas_phy *phy,
+int sas_set_phy_speed(struct sas_phy *phy,
 		      struct sas_phy_linkrates *rates)
 {
 	int ret;
@@ -212,6 +242,7 @@ static int sas_set_phy_speed(struct sas_phy *phy,
 }
 
 static struct sas_function_template sft = {
+	.phy_enable = sas_phy_enable,
 	.phy_reset = sas_phy_reset,
 	.set_phy_speed = sas_set_phy_speed,
 	.get_linkerrors = sas_get_linkerrors,

drivers/scsi/libsas/sas_scsi_host.c

@@ -875,3 +875,4 @@ EXPORT_SYMBOL_GPL(sas_change_queue_type);
 EXPORT_SYMBOL_GPL(sas_bios_param);
 EXPORT_SYMBOL_GPL(sas_task_abort);
 EXPORT_SYMBOL_GPL(sas_phy_reset);
+EXPORT_SYMBOL_GPL(sas_phy_enable);

drivers/scsi/scsi_transport_sas.c

@@ -336,6 +336,51 @@ show_sas_device_type(struct class_device *cdev, char *buf)
 }
 static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
 
+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);
+
 static ssize_t do_sas_phy_reset(struct class_device *cdev,
 		size_t count, int hard_reset)
 {
@@ -435,6 +480,7 @@ struct sas_phy *sas_phy_alloc(struct device *parent, int number)
 		return NULL;
 
 	phy->number = number;
+	phy->enabled = 1;
 
 	device_initialize(&phy->dev);
 	phy->dev.parent = get_device(parent);
@@ -1389,6 +1435,10 @@ static int sas_user_scan(struct Scsi_Host *shost, uint channel,
 	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)
 
@@ -1479,6 +1529,7 @@ sas_attach_transport(struct sas_function_template *ft)
 	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;

include/scsi/libsas.h

@@ -614,6 +614,9 @@ struct sas_domain_function_template {
 extern int sas_register_ha(struct sas_ha_struct *);
 extern int sas_unregister_ha(struct sas_ha_struct *);
 
+int sas_set_phy_speed(struct sas_phy *phy,
+		      struct sas_phy_linkrates *rates);
+int sas_phy_enable(struct sas_phy *phy, int enabled);
 int sas_phy_reset(struct sas_phy *phy, int hard_reset);
 extern int sas_queuecommand(struct scsi_cmnd *,
 		     void (*scsi_done)(struct scsi_cmnd *));

include/scsi/scsi_transport_sas.h

@@ -54,6 +54,7 @@ struct sas_identify {
 struct sas_phy {
 	struct device		dev;
 	int			number;
+	int			enabled;
 
 	/* phy identification */
 	struct sas_identify	identify;
@@ -163,6 +164,7 @@ struct sas_function_template {
 	int (*get_enclosure_identifier)(struct sas_rphy *, u64 *);
 	int (*get_bay_identifier)(struct sas_rphy *);
 	int (*phy_reset)(struct sas_phy *, int);
+	int (*phy_enable)(struct sas_phy *, int);
 	int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
 };