From: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
In order to prevent a device from receiving an I/O request while still
in an RNC suspending or resuming state (and therefore failing that
I/O back to libsas with a reset required status) wait for the RNC state
change before proceding in the abort path.
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/scsi/isci/remote_device.c | 44 +++++++++++++++++++++++--------
drivers/scsi/isci/remote_device.h | 6 +---
drivers/scsi/isci/remote_node_context.c | 21 +++++++++++++++
drivers/scsi/isci/remote_node_context.h | 3 ++
drivers/scsi/isci/task.c | 14 +++++-----
5 files changed, 66 insertions(+), 22 deletions(-)
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index 86aca11..acc94a4 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -137,6 +137,14 @@ static enum sci_status sci_remote_device_terminate_reqs_checkabort(
return status;
}
+static bool isci_compare_suspendcount(
+ struct isci_remote_device *idev,
+ u32 localcount)
+{
+ smp_rmb();
+ return localcount != idev->rnc.suspend_count;
+}
+
enum sci_status isci_remote_device_terminate_requests(
struct isci_host *ihost,
struct isci_remote_device *idev,
@@ -144,31 +152,44 @@ enum sci_status isci_remote_device_terminate_requests(
{
enum sci_status status = SCI_SUCCESS;
unsigned long flags;
+ u32 rnc_suspend_count;
spin_lock_irqsave(&ihost->scic_lock, flags);
+
if (isci_get_device(idev) == NULL) {
dev_dbg(&ihost->pdev->dev, "%s: failed isci_get_device(idev=%p)\n",
__func__, idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
status = SCI_FAILURE;
} else {
+ /* If already suspended, don't wait for another suspension. */
+ smp_rmb();
+ rnc_suspend_count
+ = sci_remote_node_context_is_suspended(&idev->rnc)
+ ? 0 : idev->rnc.suspend_count;
+
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p, ireq=%p; started_request_count=%d, "
+ "rnc_suspend_count=%d, rnc.suspend_count=%d"
"about to wait\n",
- __func__, idev, ireq, idev->started_request_count);
+ __func__, idev, ireq, idev->started_request_count,
+ rnc_suspend_count, idev->rnc.suspend_count);
if (ireq) {
/* Terminate a specific TC. */
sci_remote_device_terminate_req(ihost, idev, 0, ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
- wait_event(ihost->eventq, !test_bit(IREQ_ACTIVE,
- &ireq->flags));
-
+ wait_event(ihost->eventq,
+ (isci_compare_suspendcount(idev,
+ rnc_suspend_count)
+ && !test_bit(IREQ_ACTIVE, &ireq->flags)));
} else {
/* Terminate all TCs. */
sci_remote_device_terminate_requests(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
wait_event(ihost->eventq,
- idev->started_request_count == 0);
+ (isci_compare_suspendcount(idev,
+ rnc_suspend_count)
+ && idev->started_request_count == 0));
}
dev_dbg(&ihost->pdev->dev, "%s: idev=%p, wait done\n",
__func__, idev);
@@ -1234,19 +1255,20 @@ enum sci_status sci_remote_device_resume(
return status;
}
-enum sci_status isci_remote_device_resume(
+enum sci_status isci_remote_device_resume_from_abort(
struct isci_host *ihost,
- struct isci_remote_device *idev,
- scics_sds_remote_node_context_callback cb_fn,
- void *cb_p)
+ struct isci_remote_device *idev)
{
unsigned long flags;
enum sci_status status;
spin_lock_irqsave(&ihost->scic_lock, flags);
- status = sci_remote_device_resume(idev, cb_fn, cb_p);
+ /* Preserve any current resume callbacks, for instance from other
+ * resumptions.
+ */
+ status = sci_remote_device_resume(idev, idev->rnc.user_callback,
+ idev->rnc.user_cookie);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
-
return status;
}
/**
diff --git a/drivers/scsi/isci/remote_device.h b/drivers/scsi/isci/remote_device.h
index ef563e5..d1d1892 100644
--- a/drivers/scsi/isci/remote_device.h
+++ b/drivers/scsi/isci/remote_device.h
@@ -357,11 +357,9 @@ enum sci_status sci_remote_device_resume(
scics_sds_remote_node_context_callback cb_fn,
void *cb_p);
-enum sci_status isci_remote_device_resume(
+enum sci_status isci_remote_device_resume_from_abort(
struct isci_host *ihost,
- struct isci_remote_device *idev,
- scics_sds_remote_node_context_callback cb_fn,
- void *cb_p);
+ struct isci_remote_device *idev);
enum sci_status isci_remote_device_reset(
struct isci_host *ihost,
diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index 48565de..77c8b51 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -90,6 +90,15 @@ bool sci_remote_node_context_is_ready(
return false;
}
+bool sci_remote_node_context_is_suspended(struct sci_remote_node_context *sci_rnc)
+{
+ u32 current_state = sci_rnc->sm.current_state_id;
+
+ if (current_state == SCI_RNC_TX_RX_SUSPENDED)
+ return true;
+ return false;
+}
+
static union scu_remote_node_context *sci_rnc_by_id(struct isci_host *ihost, u16 id)
{
if (id < ihost->remote_node_entries &&
@@ -339,6 +348,13 @@ static void sci_remote_node_context_tx_rx_suspended_state_enter(struct sci_base_
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
struct isci_remote_device *idev = rnc_to_dev(rnc);
struct isci_host *ihost = idev->owning_port->owning_controller;
+ u32 new_count = rnc->suspend_count + 1;
+
+ if (new_count == 0)
+ rnc->suspend_count = 1;
+ else
+ rnc->suspend_count = new_count;
+ smp_wmb();
/* Terminate outstanding requests pending abort. */
sci_remote_device_abort_requests_pending_abort(idev);
@@ -634,6 +650,11 @@ enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *s
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
+ dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
+ "%s: state %s, cb_fn = %p, cb_p = %p; dest_state = %d\n",
+ __func__, rnc_state_name(state), cb_fn, cb_p,
+ sci_rnc->destination_state);
+
switch (state) {
case SCI_RNC_INITIAL:
if (sci_rnc->remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
diff --git a/drivers/scsi/isci/remote_node_context.h b/drivers/scsi/isci/remote_node_context.h
index 9eee304..c61c02e 100644
--- a/drivers/scsi/isci/remote_node_context.h
+++ b/drivers/scsi/isci/remote_node_context.h
@@ -170,6 +170,7 @@ struct sci_remote_node_context {
*/
u32 suspend_type;
enum sci_remote_node_suspension_reasons suspend_reason;
+ u32 suspend_count;
/**
* This field is true if the remote node context is resuming from its current
@@ -203,6 +204,8 @@ void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
bool sci_remote_node_context_is_ready(
struct sci_remote_node_context *sci_rnc);
+bool sci_remote_node_context_is_suspended(struct sci_remote_node_context *sci_rnc);
+
enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
u32 event_code);
enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
index 5d738fd..c1c6dd0 100644
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -317,11 +317,11 @@ static int isci_task_execute_tmf(struct isci_host *ihost,
spin_unlock_irqrestore(&ihost->scic_lock, flags);
goto err_tci;
}
- /* The RNC must be unsuspended before the TMF can get a response. */
- sci_remote_device_resume(idev, NULL, NULL);
-
spin_unlock_irqrestore(&ihost->scic_lock, flags);
+ /* The RNC must be unsuspended before the TMF can get a response. */
+ isci_remote_device_resume_from_abort(ihost, idev);
+
/* Wait for the TMF to complete, or a timeout. */
timeleft = wait_for_completion_timeout(&completion,
msecs_to_jiffies(timeout_ms));
@@ -554,11 +554,11 @@ int isci_task_abort_task(struct sas_task *task)
sas_protocol_ata(task->task_proto) ||
test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
- /* No task to send, so explicitly resume the device here */
- sci_remote_device_resume(idev, NULL, NULL);
-
spin_unlock_irqrestore(&ihost->scic_lock, flags);
+ /* No task to send, so explicitly resume the device here */
+ isci_remote_device_resume_from_abort(ihost, idev);
+
dev_warn(&ihost->pdev->dev,
"%s: %s request"
" or complete_in_target (%d), thus no TMF\n",
@@ -757,7 +757,7 @@ static int isci_reset_device(struct isci_host *ihost,
reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
/* Explicitly resume the RNC here, since there was no task sent. */
- isci_remote_device_resume(ihost, idev, NULL, NULL);
+ isci_remote_device_resume_from_abort(ihost, idev);
dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
__func__, idev, reset_stat);
--
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