libata error handling provides for a timeout for link recovery. libsas
must not rescan for previously known devices in this interval otherwise
it may remove a device that is simply waiting for its link to recover.
Let libata-eh make the determination of when the link is stable and
prevent libsas (host workqueue) from taking action while this
determination is pending.
This adds a new cleanup state for domain devices to libsas
'allocated-not-probed'. In this state dev->rphy points to a rphy that
is known to have been through a sas_rphy_add() event. At
sas_unregister_dev() time check if this device is still pending probe
and cleanup accordingly.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/scsi/libsas/sas_ata.c | 45 +++++++++++++++++++++++++++++++++---
drivers/scsi/libsas/sas_discover.c | 25 ++++++++++++++++++--
drivers/scsi/libsas/sas_expander.c | 5 ++--
drivers/scsi/libsas/sas_init.c | 1 +
drivers/scsi/libsas/sas_internal.h | 1 +
drivers/scsi/libsas/sas_port.c | 1 +
include/scsi/libsas.h | 8 +++++-
include/scsi/sas_ata.h | 5 ++++
8 files changed, 79 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 0489001..4b91c74 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -753,6 +753,35 @@ static int sas_discover_sata_pm(struct domain_device *dev)
return -ENODEV;
}
+void sas_probe_sata(struct work_struct *work)
+{
+ struct domain_device *dev, *n;
+ struct sas_discovery_event *ev =
+ container_of(work, struct sas_discovery_event, work);
+ struct asd_sas_port *port = ev->port;
+
+ clear_bit(DISCE_PROBE, &port->disc.pending);
+
+ list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
+ int err;
+
+ spin_lock_irq(&port->dev_list_lock);
+ list_add_tail(&dev->dev_list_node, &port->dev_list);
+ spin_unlock_irq(&port->dev_list_lock);
+
+ err = sas_rphy_add(dev->rphy);
+
+ if (err) {
+ SAS_DPRINTK("%s: for %s device %16llx returned %d\n",
+ __func__, dev->parent ? "exp-attached" :
+ "direct-attached",
+ SAS_ADDR(dev->sas_addr), err);
+ sas_unregister_dev(port, dev);
+ } else
+ list_del_init(&dev->disco_list_node);
+ }
+}
+
/**
* sas_discover_sata -- discover an STP/SATA domain device
* @dev: pointer to struct domain_device of interest
@@ -789,10 +818,15 @@ int sas_discover_sata(struct domain_device *dev)
break;
}
sas_notify_lldd_dev_gone(dev);
- if (!res) {
- sas_notify_lldd_dev_found(dev);
- res = sas_rphy_add(dev->rphy);
- }
+
+ if (res)
+ return res;
+
+ res = sas_notify_lldd_dev_found(dev);
+ if (res)
+ return res;
+
+ sas_discover_event(dev->port, DISCE_PROBE);
return res;
}
@@ -800,7 +834,9 @@ int sas_discover_sata(struct domain_device *dev)
void sas_ata_strategy_handler(struct Scsi_Host *shost)
{
struct scsi_device *sdev;
+ struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+ mutex_lock(&sas_ha->eh_mutex);
shost_for_each_device(sdev, shost) {
struct domain_device *ddev = sdev_to_domain_dev(sdev);
struct ata_port *ap = ddev->sata_dev.ap;
@@ -811,6 +847,7 @@ void sas_ata_strategy_handler(struct Scsi_Host *shost)
ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
ata_scsi_port_error_handler(shost, ap);
}
+ mutex_unlock(&sas_ha->eh_mutex);
}
int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index ed04118..5fb072c 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -148,9 +148,14 @@ static int sas_get_port_device(struct asd_sas_port *port)
port->disc.max_level = 0;
dev->rphy = rphy;
- spin_lock_irq(&port->dev_list_lock);
- list_add_tail(&dev->dev_list_node, &port->dev_list);
- spin_unlock_irq(&port->dev_list_lock);
+
+ if (dev_is_sata(dev))
+ list_add_tail(&dev->disco_list_node, &port->disco_list);
+ else {
+ spin_lock_irq(&port->dev_list_lock);
+ list_add_tail(&dev->dev_list_node, &port->dev_list);
+ spin_unlock_irq(&port->dev_list_lock);
+ }
return 0;
}
@@ -257,6 +262,12 @@ static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_d
void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
{
+ if (!list_empty(&dev->disco_list_node)) {
+ list_del_init(&dev->disco_list_node);
+ sas_rphy_free(dev->rphy);
+ dev->rphy = NULL;
+ }
+
if (dev->rphy) {
sas_remove_children(&dev->rphy->dev);
sas_rphy_delete(dev->rphy);
@@ -271,6 +282,8 @@ void sas_unregister_domain_devices(struct asd_sas_port *port)
list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node)
sas_unregister_dev(port, dev);
+ list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
+ sas_unregister_dev(port, dev);
port->port->rphy = NULL;
@@ -335,6 +348,7 @@ static void sas_discover_domain(struct work_struct *work)
sas_rphy_free(dev->rphy);
dev->rphy = NULL;
+ list_del_init(&dev->disco_list_node);
spin_lock_irq(&port->dev_list_lock);
list_del_init(&dev->dev_list_node);
spin_unlock_irq(&port->dev_list_lock);
@@ -358,8 +372,12 @@ static void sas_revalidate_domain(struct work_struct *work)
SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
task_pid_nr(current));
+
+ /* prevent rediscovery from finding sata links in recovery */
+ mutex_lock(&port->ha->eh_mutex);
if (port->port_dev)
res = sas_ex_revalidate_domain(port->port_dev);
+ mutex_unlock(&port->ha->eh_mutex);
SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
port->id, task_pid_nr(current), res);
@@ -395,6 +413,7 @@ void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
+ [DISCE_PROBE] = sas_probe_sata,
};
disc->pending = 0;
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 15d2239..c3846cf 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -704,9 +704,7 @@ static struct domain_device *sas_ex_discover_end_dev(
child->rphy = rphy;
- spin_lock_irq(&parent->port->dev_list_lock);
- list_add_tail(&child->dev_list_node, &parent->port->dev_list);
- spin_unlock_irq(&parent->port->dev_list_lock);
+ list_add_tail(&child->disco_list_node, &parent->port->disco_list);
res = sas_discover_sata(child);
if (res) {
@@ -756,6 +754,7 @@ static struct domain_device *sas_ex_discover_end_dev(
sas_rphy_free(child->rphy);
child->rphy = NULL;
+ list_del(&child->disco_list_node);
spin_lock_irq(&parent->port->dev_list_lock);
list_del(&child->dev_list_node);
spin_unlock_irq(&parent->port->dev_list_lock);
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index a435876..55e34c6 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -104,6 +104,7 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
{
int error = 0;
+ mutex_init(&sas_ha->eh_mutex);
spin_lock_init(&sas_ha->phy_port_lock);
sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index 7fe4ede..128c941 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -152,6 +152,7 @@ static inline struct domain_device *sas_alloc_device(void)
if (dev) {
INIT_LIST_HEAD(&dev->siblings);
INIT_LIST_HEAD(&dev->dev_list_node);
+ INIT_LIST_HEAD(&dev->disco_list_node);
kref_init(&dev->kref);
}
return dev;
diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c
index a47c7a7..df230f1 100644
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -277,6 +277,7 @@ static void sas_init_port(struct asd_sas_port *port,
memset(port, 0, sizeof(*port));
port->id = i;
INIT_LIST_HEAD(&port->dev_list);
+ INIT_LIST_HEAD(&port->disco_list);
spin_lock_init(&port->phy_list_lock);
INIT_LIST_HEAD(&port->phy_list);
port->ha = sas_ha;
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index de63a66..f1e4f2d 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -86,7 +86,8 @@ enum discover_event {
DISCE_DISCOVER_DOMAIN = 0U,
DISCE_REVALIDATE_DOMAIN = 1,
DISCE_PORT_GONE = 2,
- DISC_NUM_EVENTS = 3,
+ DISCE_PROBE = 3,
+ DISC_NUM_EVENTS = 4,
};
/* ---------- Expander Devices ---------- */
@@ -188,6 +189,7 @@ struct domain_device {
struct asd_sas_port *port; /* shortcut to root of the tree */
struct list_head dev_list_node;
+ struct list_head disco_list_node;
enum sas_protocol iproto;
enum sas_protocol tproto;
@@ -223,7 +225,6 @@ struct sas_discovery {
int max_level;
};
-
/* The port struct is Class:RW, driver:RO */
struct asd_sas_port {
/* private: */
@@ -233,6 +234,7 @@ struct asd_sas_port {
struct domain_device *port_dev;
spinlock_t dev_list_lock;
struct list_head dev_list;
+ struct list_head disco_list;
enum sas_linkrate linkrate;
struct sas_phy *phy;
@@ -341,6 +343,8 @@ struct sas_ha_struct {
enum sas_ha_state state;
spinlock_t state_lock;
+ struct mutex eh_mutex;
+
struct scsi_core core;
/* public: */
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index 7d5013f..557fc9a 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -45,6 +45,7 @@ int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
enum blk_eh_timer_return *rtn);
int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
struct list_head *done_q);
+void sas_probe_sata(struct work_struct *work);
#else
@@ -78,6 +79,10 @@ static inline int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
return 0;
}
+static inline void sas_probe_sata(struct work_struct *work)
+{
+}
+
#endif
#endif /* _SAS_ATA_H_ */
--
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