Commit b2024459 authored by Dan Williams's avatar Dan Williams Committed by James Bottomley

[SCSI] libsas, libata: fix start of life for a sas ata_port

This changes the ordering of initialization and probing events from:
  1/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate ata_port and schedule port probe in DISCE_PROBE
...to:
  1/ allocate ata_port in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  2/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
  3/ schedule port probe in DISCE_PROBE

This ordering prevents PHYE_SIGNAL_LOSS_EVENTS from sneaking in to
destrory ata devices before they have been fully initialized:

  BUG: unable to handle kernel paging request at 0000000000003b10
  IP: [<ffffffffa0053d7e>] sas_ata_end_eh+0x12/0x5e [libsas]
  ...
  [<ffffffffa004d1af>] sas_unregister_common_dev+0x78/0xc9 [libsas]
  [<ffffffffa004d4d4>] sas_unregister_dev+0x4f/0xad [libsas]
  [<ffffffffa004d5b1>] sas_unregister_domain_devices+0x7f/0xbf [libsas]
  [<ffffffffa004c487>] sas_deform_port+0x61/0x1b8 [libsas]
  [<ffffffffa004bed0>] sas_phye_loss_of_signal+0x29/0x2b [libsas]

...and kills the awkward "sata domain_device briefly existing in the
domain without an ata_port" state.
Reported-by: 's avatarMichal Kosciowski <michal.kosciowski@intel.com>
Signed-off-by: 's avatarDan Williams <dan.j.williams@intel.com>
Acked-by: 's avatarJeff Garzik <jgarzik@redhat.com>
Signed-off-by: 's avatarJames Bottomley <JBottomley@Parallels.com>
parent 0f3fce5c
......@@ -3839,18 +3839,25 @@ void ata_sas_port_stop(struct ata_port *ap)
}
EXPORT_SYMBOL_GPL(ata_sas_port_stop);
int ata_sas_async_port_init(struct ata_port *ap)
/**
* ata_sas_async_probe - simply schedule probing and return
* @ap: Port to probe
*
* For batch scheduling of probe for sas attached ata devices, assumes
* the port has already been through ata_sas_port_init()
*/
void ata_sas_async_probe(struct ata_port *ap)
{
int rc = ap->ops->port_start(ap);
if (!rc) {
ap->print_id = atomic_inc_return(&ata_print_id);
__ata_port_probe(ap);
}
__ata_port_probe(ap);
}
EXPORT_SYMBOL_GPL(ata_sas_async_probe);
return rc;
int ata_sas_sync_probe(struct ata_port *ap)
{
return ata_port_probe(ap);
}
EXPORT_SYMBOL_GPL(ata_sas_async_port_init);
EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
/**
* ata_sas_port_init - Initialize a SATA device
......@@ -3867,12 +3874,10 @@ int ata_sas_port_init(struct ata_port *ap)
{
int rc = ap->ops->port_start(ap);
if (!rc) {
ap->print_id = atomic_inc_return(&ata_print_id);
rc = ata_port_probe(ap);
}
return rc;
if (rc)
return rc;
ap->print_id = atomic_inc_return(&ata_print_id);
return 0;
}
EXPORT_SYMBOL_GPL(ata_sas_port_init);
......
......@@ -4549,8 +4549,12 @@ static int ipr_ata_slave_alloc(struct scsi_device *sdev)
ENTER;
if (sdev->sdev_target)
sata_port = sdev->sdev_target->hostdata;
if (sata_port)
if (sata_port) {
rc = ata_sas_port_init(sata_port->ap);
if (rc == 0)
rc = ata_sas_sync_probe(sata_port->ap);
}
if (rc)
ipr_slave_destroy(sdev);
......
......@@ -546,11 +546,12 @@ static struct ata_port_info sata_port_info = {
.port_ops = &sas_sata_ops
};
int sas_ata_init_host_and_port(struct domain_device *found_dev)
int sas_ata_init(struct domain_device *found_dev)
{
struct sas_ha_struct *ha = found_dev->port->ha;
struct Scsi_Host *shost = ha->core.shost;
struct ata_port *ap;
int rc;
ata_host_init(&found_dev->sata_dev.ata_host,
ha->dev,
......@@ -567,8 +568,11 @@ int sas_ata_init_host_and_port(struct domain_device *found_dev)
ap->private_data = found_dev;
ap->cbl = ATA_CBL_SATA;
ap->scsi_host = shost;
/* publish initialized ata port */
smp_wmb();
rc = ata_sas_port_init(ap);
if (rc) {
ata_sas_port_destroy(ap);
return rc;
}
found_dev->sata_dev.ap = ap;
return 0;
......@@ -648,18 +652,13 @@ static void sas_get_ata_command_set(struct domain_device *dev)
void sas_probe_sata(struct asd_sas_port *port)
{
struct domain_device *dev, *n;
int err;
mutex_lock(&port->ha->disco_mutex);
list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
list_for_each_entry(dev, &port->disco_list, disco_list_node) {
if (!dev_is_sata(dev))
continue;
err = sas_ata_init_host_and_port(dev);
if (err)
sas_fail_probe(dev, __func__, err);
else
ata_sas_async_port_init(dev->sata_dev.ap);
ata_sas_async_probe(dev->sata_dev.ap);
}
mutex_unlock(&port->ha->disco_mutex);
......@@ -718,18 +717,6 @@ static void async_sas_ata_eh(void *data, async_cookie_t cookie)
sas_put_device(dev);
}
static bool sas_ata_dev_eh_valid(struct domain_device *dev)
{
struct ata_port *ap;
if (!dev_is_sata(dev))
return false;
ap = dev->sata_dev.ap;
/* consume fully initialized ata ports */
smp_rmb();
return !!ap;
}
void sas_ata_strategy_handler(struct Scsi_Host *shost)
{
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
......@@ -753,7 +740,7 @@ void sas_ata_strategy_handler(struct Scsi_Host *shost)
spin_lock(&port->dev_list_lock);
list_for_each_entry(dev, &port->dev_list, dev_list_node) {
if (!sas_ata_dev_eh_valid(dev))
if (!dev_is_sata(dev))
continue;
async_schedule_domain(async_sas_ata_eh, dev, &async);
}
......
......@@ -72,6 +72,7 @@ static int sas_get_port_device(struct asd_sas_port *port)
struct asd_sas_phy *phy;
struct sas_rphy *rphy;
struct domain_device *dev;
int rc = -ENODEV;
dev = sas_alloc_device();
if (!dev)
......@@ -110,9 +111,16 @@ static int sas_get_port_device(struct asd_sas_port *port)
sas_init_dev(dev);
dev->port = port;
switch (dev->dev_type) {
case SAS_END_DEV:
case SATA_DEV:
rc = sas_ata_init(dev);
if (rc) {
rphy = NULL;
break;
}
/* fall through */
case SAS_END_DEV:
rphy = sas_end_device_alloc(port->port);
break;
case EDGE_DEV:
......@@ -131,7 +139,7 @@ static int sas_get_port_device(struct asd_sas_port *port)
if (!rphy) {
sas_put_device(dev);
return -ENODEV;
return rc;
}
rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
......@@ -139,7 +147,6 @@ static int sas_get_port_device(struct asd_sas_port *port)
sas_fill_in_rphy(dev, rphy);
sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
port->port_dev = dev;
dev->port = port;
dev->linkrate = port->linkrate;
dev->min_linkrate = port->linkrate;
dev->max_linkrate = port->linkrate;
......
......@@ -790,12 +790,14 @@ static struct domain_device *sas_ex_discover_end_dev(
if (res)
goto out_free;
sas_init_dev(child);
res = sas_ata_init(child);
if (res)
goto out_free;
rphy = sas_end_device_alloc(phy->port);
if (unlikely(!rphy))
if (!rphy)
goto out_free;
sas_init_dev(child);
child->rphy = rphy;
get_device(&rphy->dev);
......
......@@ -996,7 +996,8 @@ extern int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *dev,
extern void ata_sas_port_destroy(struct ata_port *);
extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
struct ata_port_info *, struct Scsi_Host *);
extern int ata_sas_async_port_init(struct ata_port *);
extern void ata_sas_async_probe(struct ata_port *ap);
extern int ata_sas_sync_probe(struct ata_port *ap);
extern int ata_sas_port_init(struct ata_port *);
extern int ata_sas_port_start(struct ata_port *ap);
extern void ata_sas_port_stop(struct ata_port *ap);
......
......@@ -37,7 +37,7 @@ static inline int dev_is_sata(struct domain_device *dev)
}
int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy);
int sas_ata_init_host_and_port(struct domain_device *found_dev);
int sas_ata_init(struct domain_device *dev);
void sas_ata_task_abort(struct sas_task *task);
void sas_ata_strategy_handler(struct Scsi_Host *shost);
void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
......@@ -52,7 +52,7 @@ static inline int dev_is_sata(struct domain_device *dev)
{
return 0;
}
static inline int sas_ata_init_host_and_port(struct domain_device *found_dev)
static inline int sas_ata_init(struct domain_device *dev)
{
return 0;
}
......
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