summaryrefslogtreecommitdiff
path: root/drivers/scsi/libsas/sas_discover.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/scsi/libsas/sas_discover.c')
-rw-r--r--drivers/scsi/libsas/sas_discover.c246
1 files changed, 190 insertions, 56 deletions
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 54a5199ceb56..364679675602 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -30,29 +30,30 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
+#include <scsi/sas_ata.h>
#include "../scsi_sas_internal.h"
/* ---------- Basic task processing for discovery purposes ---------- */
void sas_init_dev(struct domain_device *dev)
{
- INIT_LIST_HEAD(&dev->siblings);
- INIT_LIST_HEAD(&dev->dev_list_node);
- switch (dev->dev_type) {
- case SAS_END_DEV:
- break;
- case EDGE_DEV:
- case FANOUT_DEV:
- INIT_LIST_HEAD(&dev->ex_dev.children);
- break;
- case SATA_DEV:
- case SATA_PM:
- case SATA_PM_PORT:
- INIT_LIST_HEAD(&dev->sata_dev.children);
- break;
- default:
- break;
- }
+ switch (dev->dev_type) {
+ case SAS_END_DEV:
+ break;
+ case EDGE_DEV:
+ case FANOUT_DEV:
+ INIT_LIST_HEAD(&dev->ex_dev.children);
+ mutex_init(&dev->ex_dev.cmd_mutex);
+ break;
+ case SATA_DEV:
+ case SATA_PM:
+ case SATA_PM_PORT:
+ case SATA_PENDING:
+ INIT_LIST_HEAD(&dev->sata_dev.children);
+ break;
+ default:
+ break;
+ }
}
/* ---------- Domain device discovery ---------- */
@@ -68,19 +69,18 @@ void sas_init_dev(struct domain_device *dev)
*/
static int sas_get_port_device(struct asd_sas_port *port)
{
- unsigned long flags;
struct asd_sas_phy *phy;
struct sas_rphy *rphy;
struct domain_device *dev;
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ dev = sas_alloc_device();
if (!dev)
return -ENOMEM;
- spin_lock_irqsave(&port->phy_list_lock, flags);
+ spin_lock_irq(&port->phy_list_lock);
if (list_empty(&port->phy_list)) {
- spin_unlock_irqrestore(&port->phy_list_lock, flags);
- kfree(dev);
+ spin_unlock_irq(&port->phy_list_lock);
+ sas_put_device(dev);
return -ENODEV;
}
phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
@@ -88,7 +88,7 @@ static int sas_get_port_device(struct asd_sas_port *port)
memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
(size_t)phy->frame_rcvd_size));
spin_unlock(&phy->frame_rcvd_lock);
- spin_unlock_irqrestore(&port->phy_list_lock, flags);
+ spin_unlock_irq(&port->phy_list_lock);
if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
struct dev_to_host_fis *fis =
@@ -130,9 +130,14 @@ static int sas_get_port_device(struct asd_sas_port *port)
}
if (!rphy) {
- kfree(dev);
+ sas_put_device(dev);
return -ENODEV;
}
+
+ spin_lock_irq(&port->phy_list_lock);
+ list_for_each_entry(phy, &port->phy_list, port_phy_el)
+ sas_phy_set_target(phy, dev);
+ spin_unlock_irq(&port->phy_list_lock);
rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
sas_fill_in_rphy(dev, rphy);
@@ -147,11 +152,17 @@ static int sas_get_port_device(struct asd_sas_port *port)
memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
port->disc.max_level = 0;
+ sas_device_set_phy(dev, port->port);
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) || dev->dev_type == SAS_END_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;
}
@@ -173,6 +184,7 @@ int sas_notify_lldd_dev_found(struct domain_device *dev)
dev_name(sas_ha->dev),
SAS_ADDR(dev->sas_addr), res);
}
+ kref_get(&dev->kref);
}
return res;
}
@@ -184,12 +196,40 @@ void sas_notify_lldd_dev_gone(struct domain_device *dev)
struct Scsi_Host *shost = sas_ha->core.shost;
struct sas_internal *i = to_sas_internal(shost->transportt);
- if (i->dft->lldd_dev_gone)
+ if (i->dft->lldd_dev_gone) {
i->dft->lldd_dev_gone(dev);
+ sas_put_device(dev);
+ }
}
-/* ---------- Common/dispatchers ---------- */
+static void sas_probe_devices(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);
+ /* devices must be domain members before link recovery and probe */
+ list_for_each_entry(dev, &port->disco_list, disco_list_node) {
+ spin_lock_irq(&port->dev_list_lock);
+ list_add_tail(&dev->dev_list_node, &port->dev_list);
+ spin_unlock_irq(&port->dev_list_lock);
+ }
+
+ sas_probe_sata(port);
+
+ list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
+ int err;
+
+ err = sas_rphy_add(dev->rphy);
+ if (err)
+ sas_fail_probe(dev, __func__, err);
+ else
+ list_del_init(&dev->disco_list_node);
+ }
+}
/**
* sas_discover_end_dev -- discover an end device (SSP, etc)
@@ -203,22 +243,36 @@ int sas_discover_end_dev(struct domain_device *dev)
res = sas_notify_lldd_dev_found(dev);
if (res)
- goto out_err2;
-
- res = sas_rphy_add(dev->rphy);
- if (res)
- goto out_err;
+ return res;
+ sas_discover_event(dev->port, DISCE_PROBE);
return 0;
-
-out_err:
- sas_notify_lldd_dev_gone(dev);
-out_err2:
- return res;
}
/* ---------- Device registration and unregistration ---------- */
+void sas_free_device(struct kref *kref)
+{
+ struct domain_device *dev = container_of(kref, typeof(*dev), kref);
+
+ if (dev->parent)
+ sas_put_device(dev->parent);
+
+ sas_port_put_phy(dev->phy);
+ dev->phy = NULL;
+
+ /* remove the phys and ports, everything else should be gone */
+ if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV)
+ kfree(dev->ex_dev.ex_phy);
+
+ if (dev_is_sata(dev) && dev->sata_dev.ap) {
+ ata_sas_port_destroy(dev->sata_dev.ap);
+ dev->sata_dev.ap = NULL;
+ }
+
+ kfree(dev);
+}
+
static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
{
sas_notify_lldd_dev_gone(dev);
@@ -230,34 +284,84 @@ static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_d
spin_lock_irq(&port->dev_list_lock);
list_del_init(&dev->dev_list_node);
spin_unlock_irq(&port->dev_list_lock);
+
+ sas_put_device(dev);
}
-void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
+static void sas_destruct_devices(struct work_struct *work)
{
- if (dev->rphy) {
+ 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_DESTRUCT, &port->disc.pending);
+
+ list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
+ list_del_init(&dev->disco_list_node);
+
sas_remove_children(&dev->rphy->dev);
sas_rphy_delete(dev->rphy);
dev->rphy = NULL;
+ sas_unregister_common_dev(port, dev);
}
- if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
- /* remove the phys and ports, everything else should be gone */
- kfree(dev->ex_dev.ex_phy);
- dev->ex_dev.ex_phy = NULL;
+}
+
+void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
+{
+ if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
+ !list_empty(&dev->disco_list_node)) {
+ /* this rphy never saw sas_rphy_add */
+ list_del_init(&dev->disco_list_node);
+ sas_rphy_free(dev->rphy);
+ dev->rphy = NULL;
+ sas_unregister_common_dev(port, dev);
+ }
+
+ if (dev->rphy && !test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
+ sas_rphy_unlink(dev->rphy);
+ list_move_tail(&dev->disco_list_node, &port->destroy_list);
+ sas_discover_event(dev->port, DISCE_DESTRUCT);
}
- sas_unregister_common_dev(port, dev);
}
-void sas_unregister_domain_devices(struct asd_sas_port *port)
+void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
{
struct domain_device *dev, *n;
- list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node)
+ list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
+ if (gone)
+ set_bit(SAS_DEV_GONE, &dev->state);
+ 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;
}
+void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
+{
+ struct sas_ha_struct *ha;
+ struct sas_phy *new_phy;
+
+ if (!dev)
+ return;
+
+ ha = dev->port->ha;
+ new_phy = sas_port_get_phy(port);
+
+ /* pin and record last seen phy */
+ spin_lock_irq(&ha->phy_port_lock);
+ if (new_phy) {
+ sas_port_put_phy(dev->phy);
+ dev->phy = new_phy;
+ }
+ spin_unlock_irq(&ha->phy_port_lock);
+}
+
/* ---------- Discovery and Revalidation ---------- */
/**
@@ -277,8 +381,7 @@ static void sas_discover_domain(struct work_struct *work)
container_of(work, struct sas_discovery_event, work);
struct asd_sas_port *port = ev->port;
- sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
- &port->disc.pending);
+ clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
if (port->port_dev)
return;
@@ -318,11 +421,12 @@ 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);
- kfree(dev); /* not kobject_register-ed yet */
+ sas_put_device(dev);
port->port_dev = NULL;
}
@@ -336,21 +440,51 @@ static void sas_revalidate_domain(struct work_struct *work)
struct sas_discovery_event *ev =
container_of(work, struct sas_discovery_event, work);
struct asd_sas_port *port = ev->port;
+ struct sas_ha_struct *ha = port->ha;
+
+ /* prevent revalidation from finding sata links in recovery */
+ mutex_lock(&ha->disco_mutex);
+ if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
+ SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
+ port->id, task_pid_nr(current));
+ goto out;
+ }
- sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
- &port->disc.pending);
+ clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
task_pid_nr(current));
+
if (port->port_dev)
res = sas_ex_revalidate_domain(port->port_dev);
SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
port->id, task_pid_nr(current), res);
+ out:
+ mutex_unlock(&ha->disco_mutex);
}
/* ---------- Events ---------- */
+static void sas_chain_work(struct sas_ha_struct *ha, struct work_struct *work)
+{
+ /* chained work is not subject to SA_HA_DRAINING or SAS_HA_REGISTERED */
+ scsi_queue_work(ha->core.shost, work);
+}
+
+static void sas_chain_event(int event, unsigned long *pending,
+ struct work_struct *work,
+ struct sas_ha_struct *ha)
+{
+ if (!test_and_set_bit(event, pending)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&ha->state_lock, flags);
+ sas_chain_work(ha, work);
+ spin_unlock_irqrestore(&ha->state_lock, flags);
+ }
+}
+
int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
{
struct sas_discovery *disc;
@@ -361,8 +495,7 @@ int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
BUG_ON(ev >= DISC_NUM_EVENTS);
- sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
- &disc->disc_work[ev].work, port->ha);
+ sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
return 0;
}
@@ -380,9 +513,10 @@ 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_devices,
+ [DISCE_DESTRUCT] = sas_destruct_devices,
};
- spin_lock_init(&disc->disc_event_lock);
disc->pending = 0;
for (i = 0; i < DISC_NUM_EVENTS; i++) {
INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);