Use ata_wait_after_reset() to poll for link recovery after a reset.
This combined with sas_ha->eh_mutex prevents expander rediscovery from
probing phys in an intermediate state. Local discovery does not have a
mechanism to filter link status changes during this timeout, so it
remains the responsibility of lldds to prevent premature port teardown.
Although once all lldd's support ->lldd_ata_check_ready() that could be
used as a gate to local port teardown.
The signature fis is re-transmitted when the link comes back so we
should be revalidating the ata device class, but that is left to a future
patch.
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/scsi/libsas/sas_ata.c | 104 +++++++++++++++++++++++++-----------
drivers/scsi/libsas/sas_expander.c | 10 ++-
drivers/scsi/libsas/sas_internal.h | 3 +
include/scsi/libsas.h | 1
4 files changed, 83 insertions(+), 35 deletions(-)
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 773e010..a5a7184 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -267,39 +267,84 @@ static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
return true;
}
-static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
- unsigned long deadline)
+static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
+{
+ return to_sas_internal(dev->port->ha->core.shost->transportt);
+}
+
+static int smp_ata_check_ready(struct ata_link *link)
{
+ int res;
+ u8 addr[8];
struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
- struct sas_internal *i =
- to_sas_internal(dev->port->ha->core.shost->transportt);
- int res = TMF_RESP_FUNC_FAILED;
- int ret = 0;
+ struct domain_device *ex_dev = dev->parent;
+ struct sas_phy *phy = sas_find_local_phy(dev);
- if (i->dft->lldd_I_T_nexus_reset)
- res = i->dft->lldd_I_T_nexus_reset(dev);
+ res = sas_get_phy_attached_sas_addr(ex_dev, phy->number, addr);
+ /* break the wait early if the expander is unreachable,
+ * otherwise keep polling
+ */
+ if (res == -ECOMM)
+ return res;
+ if (res != SMP_RESP_FUNC_ACC || SAS_ADDR(addr) == 0)
+ return 0;
+ else
+ return 1;
+}
- if (res != TMF_RESP_FUNC_COMPLETE) {
- SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
- ret = -EAGAIN;
+static int local_ata_check_ready(struct ata_link *link)
+{
+ struct ata_port *ap = link->ap;
+ struct domain_device *dev = ap->private_data;
+ struct sas_internal *i = dev_to_sas_internal(dev);
+
+ if (i->dft->lldd_ata_check_ready)
+ return i->dft->lldd_ata_check_ready(dev);
+ else {
+ /* lldd's that don't implement 'ready' checking get the
+ * old default behavior of not coordinating reset
+ * recovery with libata
+ */
+ return 1;
}
+}
+static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ int ret = 0, res;
+ struct ata_port *ap = link->ap;
+ int (*check_ready)(struct ata_link *link);
+ struct domain_device *dev = ap->private_data;
+ struct sas_phy *phy = sas_find_local_phy(dev);
+ struct sas_internal *i = dev_to_sas_internal(dev);
+
+ res = i->dft->lldd_I_T_nexus_reset(dev);
+
+ if (res != TMF_RESP_FUNC_COMPLETE)
+ SAS_DPRINTK("%s: Unable to reset ata device?\n", __func__);
+
+ if (scsi_is_sas_phy_local(phy))
+ check_ready = local_ata_check_ready;
+ else
+ check_ready = smp_ata_check_ready;
+
+ ret = ata_wait_after_reset(link, deadline, check_ready);
+ if (ret && ret != -EAGAIN)
+ ata_link_err(link, "COMRESET failed (errno=%d)\n", ret);
+
+ /* XXX: if the class changes during the reset the upper layer
+ * should be informed, if the device has gone away we assume
+ * libsas will eventually delete it
+ */
switch (dev->sata_dev.command_set) {
- case ATA_COMMAND_SET:
- SAS_DPRINTK("%s: Found ATA device.\n", __func__);
- *class = ATA_DEV_ATA;
- break;
- case ATAPI_COMMAND_SET:
- SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
- *class = ATA_DEV_ATAPI;
- break;
- default:
- SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
- __func__,
- dev->sata_dev.command_set);
- *class = ATA_DEV_UNKNOWN;
- break;
+ case ATA_COMMAND_SET:
+ *class = ATA_DEV_ATA;
+ break;
+ case ATAPI_COMMAND_SET:
+ *class = ATA_DEV_ATAPI;
+ break;
}
ap->cbl = ATA_CBL_SATA;
@@ -311,8 +356,7 @@ static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
{
struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
- struct sas_internal *i =
- to_sas_internal(dev->port->ha->core.shost->transportt);
+ struct sas_internal *i = dev_to_sas_internal(dev);
int res = TMF_RESP_FUNC_FAILED;
int ret = 0;
@@ -350,8 +394,7 @@ static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
*/
static void sas_ata_internal_abort(struct sas_task *task)
{
- struct sas_internal *si =
- to_sas_internal(task->dev->port->ha->core.shost->transportt);
+ struct sas_internal *si = dev_to_sas_internal(task->dev);
unsigned long flags;
int res;
@@ -421,8 +464,7 @@ static void sas_ata_post_internal(struct ata_queued_cmd *qc)
static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
{
struct domain_device *dev = ap->private_data;
- struct sas_internal *i =
- to_sas_internal(dev->port->ha->core.shost->transportt);
+ struct sas_internal *i = dev_to_sas_internal(dev);
if (i->dft->lldd_ata_set_dmamode)
i->dft->lldd_ata_set_dmamode(dev);
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index fd77ea3..5e1eec9 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -125,7 +125,11 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
task->task_status.stat == SAS_DATA_OVERRUN) {
res = -EMSGSIZE;
break;
- } else {
+ }
+ if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
+ task->task_status.stat == SAS_DEVICE_UNKNOWN)
+ break;
+ else {
SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
"status 0x%x\n", __func__,
SAS_ADDR(dev->sas_addr),
@@ -1648,8 +1652,8 @@ static int sas_get_phy_change_count(struct domain_device *dev,
return res;
}
-static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
- int phy_id, u8 *attached_sas_addr)
+int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
+ u8 *attached_sas_addr)
{
int res;
struct smp_resp *disc_resp;
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index 5879e72..dde4f29 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -74,7 +74,8 @@ int sas_smp_get_phy_events(struct sas_phy *phy);
struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
-
+int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
+ u8 *attached_sas_addr);
void sas_hae_reset(struct work_struct *work);
void sas_free_device(struct kref *kref);
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index a8159f9..42110f9 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -605,6 +605,7 @@ struct sas_domain_function_template {
int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
int (*lldd_I_T_nexus_reset)(struct domain_device *);
int (*lldd_ata_soft_reset)(struct domain_device *);
+ int (*lldd_ata_check_ready)(struct domain_device *);
void (*lldd_ata_set_dmamode)(struct domain_device *);
int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
int (*lldd_query_task)(struct sas_task *);
--
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