From: Dan Williams <dan.j.williams@intel.com>
To: linux-scsi@vger.kernel.org
Cc: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Subject: [isci-rnc PATCH v1 04/37] isci: Terminate outstanding TCs on TX/RX RNC suspensions.
Date: Thu, 22 Mar 2012 17:28:09 -0700 [thread overview]
Message-ID: <20120323002809.18065.34411.stgit@dwillia2-linux.jf.intel.com> (raw)
In-Reply-To: <20120323002504.18065.45709.stgit@dwillia2-linux.jf.intel.com>
From: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
TCs must only be terminated when RNCs are suspended.
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/scsi/isci/host.c | 22 +++---
drivers/scsi/isci/remote_device.c | 106 ++++++++++++++++++++++++++++---
drivers/scsi/isci/remote_device.h | 10 +++
drivers/scsi/isci/remote_node_context.c | 56 ++++++++++++++++
drivers/scsi/isci/remote_node_context.h | 2 +
drivers/scsi/isci/request.c | 22 ++++--
drivers/scsi/isci/request.h | 2 +
7 files changed, 188 insertions(+), 32 deletions(-)
diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 95c3da6..a43bc22 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -2678,18 +2678,18 @@ enum sci_status sci_controller_terminate_request(struct isci_host *ihost,
__func__, ihost->sm.current_state_id);
return SCI_FAILURE_INVALID_STATE;
}
-
status = sci_io_request_terminate(ireq);
- if (status != SCI_SUCCESS)
- return status;
-
- /*
- * Utilize the original post context command and or in the POST_TC_ABORT
- * request sub-type.
- */
- sci_controller_post_request(ihost,
- ireq->post_context | SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT);
- return SCI_SUCCESS;
+ if ((status == SCI_SUCCESS) &&
+ !test_bit(IREQ_PENDING_ABORT, &ireq->flags) &&
+ !test_and_set_bit(IREQ_TC_ABORT_POSTED, &ireq->flags)) {
+ /* Utilize the original post context command and or in the
+ * POST_TC_ABORT request sub-type.
+ */
+ sci_controller_post_request(
+ ihost, ireq->post_context |
+ SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT);
+ }
+ return status;
}
/**
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index b1a8000..9f03877 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -133,6 +133,50 @@ static void isci_remote_device_ready(struct isci_host *ihost, struct isci_remote
wake_up(&ihost->eventq);
}
+static enum sci_status sci_remote_device_suspend(
+ struct isci_remote_device *idev)
+{
+ return sci_remote_node_context_suspend(
+ &idev->rnc,
+ SCI_SOFTWARE_SUSPENSION,
+ SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT,
+ NULL, NULL);
+}
+
+enum sci_status isci_remote_device_suspend(
+ struct isci_host *ihost,
+ struct isci_remote_device *idev)
+{
+ enum sci_status status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+
+ if (isci_lookup_device(idev->domain_dev) == NULL) {
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+ status = SCI_FAILURE;
+ } else {
+ status = sci_remote_device_suspend(idev);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+ if (status == SCI_SUCCESS) {
+ wait_event(ihost->eventq,
+ test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
+ || !test_bit(IDEV_ALLOCATED, &idev->flags));
+
+ status = test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
+ ? SCI_SUCCESS : SCI_FAILURE;
+ dev_dbg(&ihost->pdev->dev,
+ "%s: idev=%p, wait done, device is %s\n",
+ __func__, idev,
+ test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
+ ? "<suspended>" : "<deallocated!>");
+
+ }
+ isci_put_device(idev);
+ }
+ return status;
+}
+
/* called once the remote node context is ready to be freed.
* The remote device can now report that its stop operation is complete. none
*/
@@ -144,7 +188,9 @@ static void rnc_destruct_done(void *_dev)
sci_change_state(&idev->sm, SCI_DEV_STOPPED);
}
-static enum sci_status sci_remote_device_terminate_requests(struct isci_remote_device *idev)
+static enum sci_status sci_remote_device_terminate_requests_checkabort(
+ struct isci_remote_device *idev,
+ int check_abort_pending)
{
struct isci_host *ihost = idev->owning_port->owning_controller;
enum sci_status status = SCI_SUCCESS;
@@ -155,7 +201,9 @@ static enum sci_status sci_remote_device_terminate_requests(struct isci_remote_d
enum sci_status s;
if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
- ireq->target_device != idev)
+ (ireq->target_device != idev) ||
+ (check_abort_pending && !test_bit(IREQ_PENDING_ABORT,
+ &ireq->flags)))
continue;
s = sci_controller_terminate_request(ihost, idev, ireq);
@@ -166,6 +214,12 @@ static enum sci_status sci_remote_device_terminate_requests(struct isci_remote_d
return status;
}
+enum sci_status sci_remote_device_terminate_requests(
+ struct isci_remote_device *idev)
+{
+ return sci_remote_device_terminate_requests_checkabort(idev, 0);
+}
+
enum sci_status sci_remote_device_stop(struct isci_remote_device *idev,
u32 timeout)
{
@@ -265,14 +319,6 @@ enum sci_status sci_remote_device_reset_complete(struct isci_remote_device *idev
return SCI_SUCCESS;
}
-enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev)
-{
- return sci_remote_node_context_suspend(&idev->rnc,
- SCI_SOFTWARE_SUSPENSION,
- SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT,
- NULL, NULL);
-}
-
enum sci_status sci_remote_device_frame_handler(struct isci_remote_device *idev,
u32 frame_index)
{
@@ -1186,7 +1232,7 @@ static enum sci_status sci_remote_device_ea_construct(struct isci_port *iport,
* the device when there have been no phys added to it.
*/
static enum sci_status sci_remote_device_start(struct isci_remote_device *idev,
- u32 timeout)
+ u32 timeout)
{
struct sci_base_state_machine *sm = &idev->sm;
enum sci_remote_device_states state = sm->current_state_id;
@@ -1413,3 +1459,41 @@ int isci_remote_device_found(struct domain_device *dev)
return status == SCI_SUCCESS ? 0 : -ENODEV;
}
+
+enum sci_status isci_remote_device_reset(
+ struct isci_remote_device *idev)
+{
+ struct isci_host *ihost = dev_to_ihost(idev->domain_dev);
+ unsigned long flags;
+ enum sci_status status;
+
+ /* Wait for the device suspend. */
+ status = isci_remote_device_suspend(ihost, idev);
+ if (status != SCI_SUCCESS) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: isci_remote_device_suspend(%p) returned %d!\n",
+ __func__, idev, status);
+ return status;
+ }
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+ status = sci_remote_device_reset(idev);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+ if (status != SCI_SUCCESS) {
+ dev_dbg(&ihost->pdev->dev,
+ "%s: sci_remote_device_reset(%p) returned %d!\n",
+ __func__, idev, status);
+ }
+ return status;
+}
+
+int isci_remote_device_is_safe_to_abort(
+ struct isci_remote_device *idev)
+{
+ return sci_remote_node_context_is_safe_to_abort(&idev->rnc);
+}
+
+enum sci_status sci_remote_device_abort_requests_pending_abort(
+ struct isci_remote_device *idev)
+{
+ return sci_remote_device_terminate_requests_checkabort(idev, 1);
+}
diff --git a/drivers/scsi/isci/remote_device.h b/drivers/scsi/isci/remote_device.h
index 3915905..ae508ee 100644
--- a/drivers/scsi/isci/remote_device.h
+++ b/drivers/scsi/isci/remote_device.h
@@ -85,6 +85,7 @@ struct isci_remote_device {
#define IDEV_GONE 3
#define IDEV_IO_READY 4
#define IDEV_IO_NCQERROR 5
+ #define IDEV_TXRX_SUSPENDED 6
unsigned long flags;
struct kref kref;
struct isci_port *isci_port;
@@ -335,4 +336,13 @@ void sci_remote_device_post_request(
struct isci_remote_device *idev,
u32 request);
+enum sci_status sci_remote_device_terminate_requests(
+ struct isci_remote_device *idev);
+
+int isci_remote_device_is_safe_to_abort(
+ struct isci_remote_device *idev);
+
+enum sci_status
+sci_remote_device_abort_requests_pending_abort(
+ struct isci_remote_device *idev);
#endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */
diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index f180c72..7a8347e 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -268,6 +268,8 @@ static void sci_remote_node_context_invalidating_state_enter(struct sci_base_sta
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
+ /* Terminate outstanding requests pending abort. */
+ sci_remote_device_abort_requests_pending_abort(rnc_to_dev(rnc));
sci_remote_node_context_invalidate_context_buffer(rnc);
}
@@ -312,10 +314,28 @@ static void sci_remote_node_context_tx_suspended_state_enter(struct sci_base_sta
static void sci_remote_node_context_tx_rx_suspended_state_enter(struct sci_base_state_machine *sm)
{
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;
+
+ set_bit(IDEV_TXRX_SUSPENDED, &idev->flags);
+ /* Terminate outstanding requests pending abort. */
+ sci_remote_device_abort_requests_pending_abort(idev);
+
+ wake_up(&ihost->eventq);
sci_remote_node_context_continue_state_transitions(rnc);
}
+static void sci_remote_node_context_tx_rx_suspended_state_exit(
+ struct sci_base_state_machine *sm)
+{
+ struct sci_remote_node_context *rnc
+ = container_of(sm, typeof(*rnc), sm);
+ struct isci_remote_device *idev = rnc_to_dev(rnc);
+
+ clear_bit(IDEV_TXRX_SUSPENDED, &idev->flags);
+}
+
static void sci_remote_node_context_await_suspend_state_exit(
struct sci_base_state_machine *sm)
{
@@ -346,6 +366,8 @@ static const struct sci_base_state sci_remote_node_context_state_table[] = {
},
[SCI_RNC_TX_RX_SUSPENDED] = {
.enter_state = sci_remote_node_context_tx_rx_suspended_state_enter,
+ .exit_state
+ = sci_remote_node_context_tx_rx_suspended_state_exit,
},
[SCI_RNC_AWAIT_SUSPENSION] = {
.exit_state = sci_remote_node_context_await_suspend_state_exit,
@@ -515,6 +537,13 @@ enum sci_status sci_remote_node_context_suspend(
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
enum sci_status status = SCI_FAILURE_INVALID_STATE;
+ dev_dbg(scirdev_to_dev(idev),
+ "%s: current state %d, current suspend_type %x dest state %d,"
+ " arg suspend_reason %d, arg suspend_type %x",
+ __func__, state, sci_rnc->suspend_type,
+ sci_rnc->destination_state, suspend_reason,
+ suspend_type);
+
/* Disable automatic state continuations if explicitly suspending. */
if (suspend_reason == SCI_SOFTWARE_SUSPENSION)
sci_rnc->destination_state
@@ -546,7 +575,10 @@ enum sci_status sci_remote_node_context_suspend(
sci_rnc->suspend_type = suspend_type;
if (status == SCI_SUCCESS) { /* Already in the destination state? */
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
sci_remote_node_context_notify_user(sci_rnc);
+ wake_up_all(&ihost->eventq); /* Let observers look. */
return SCI_SUCCESS;
}
if (suspend_reason == SCI_SOFTWARE_SUSPENSION) {
@@ -661,3 +693,27 @@ enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_contex
return SCI_FAILURE_INVALID_STATE;
}
}
+
+int sci_remote_node_context_is_safe_to_abort(
+ struct sci_remote_node_context *sci_rnc)
+{
+ enum scis_sds_remote_node_context_states state;
+
+ state = sci_rnc->sm.current_state_id;
+ switch (state) {
+ case SCI_RNC_INVALIDATING:
+ case SCI_RNC_TX_RX_SUSPENDED:
+ return 1;
+ case SCI_RNC_POSTING:
+ case SCI_RNC_RESUMING:
+ case SCI_RNC_READY:
+ case SCI_RNC_TX_SUSPENDED:
+ case SCI_RNC_AWAIT_SUSPENSION:
+ case SCI_RNC_INITIAL:
+ return 0;
+ default:
+ dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
+ "%s: invalid state %d\n", __func__, state);
+ return 0;
+ }
+}
diff --git a/drivers/scsi/isci/remote_node_context.h b/drivers/scsi/isci/remote_node_context.h
index 276fc49..5ddf88b 100644
--- a/drivers/scsi/isci/remote_node_context.h
+++ b/drivers/scsi/isci/remote_node_context.h
@@ -214,5 +214,7 @@ enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_contex
struct isci_request *ireq);
enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
struct isci_request *ireq);
+int sci_remote_node_context_is_safe_to_abort(
+ struct sci_remote_node_context *sci_rnc);
#endif /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 847d971..d0386e1 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -863,6 +863,8 @@ sci_io_request_terminate(struct isci_request *ireq)
switch (state) {
case SCI_REQ_CONSTRUCTED:
+ /* Set to make sure no HW terminate posting is done: */
+ set_bit(IREQ_TC_ABORT_POSTED, &ireq->flags);
ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
@@ -883,8 +885,7 @@ sci_io_request_terminate(struct isci_request *ireq)
case SCI_REQ_ATAPI_WAIT_PIO_SETUP:
case SCI_REQ_ATAPI_WAIT_D2H:
case SCI_REQ_ATAPI_WAIT_TC_COMP:
- sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
- return SCI_SUCCESS;
+ /* Fall through and change state to ABORTING... */
case SCI_REQ_TASK_WAIT_TC_RESP:
/* The task frame was already confirmed to have been
* sent by the SCU HW. Since the state machine is
@@ -893,20 +894,21 @@ sci_io_request_terminate(struct isci_request *ireq)
* and don't wait for the task response.
*/
sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
- sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
- return SCI_SUCCESS;
+ /* Fall through and handle like ABORTING... */
case SCI_REQ_ABORTING:
- /* If a request has a termination requested twice, return
- * a failure indication, since HW confirmation of the first
- * abort is still outstanding.
+ if (!isci_remote_device_is_safe_to_abort(ireq->target_device))
+ set_bit(IREQ_PENDING_ABORT, &ireq->flags);
+ else
+ clear_bit(IREQ_PENDING_ABORT, &ireq->flags);
+ /* If the request is only waiting on the remote device
+ * suspension, return SUCCESS so the caller will wait too.
*/
+ return SCI_SUCCESS;
case SCI_REQ_COMPLETED:
default:
dev_warn(&ireq->owning_controller->pdev->dev,
"%s: SCIC IO Request requested to abort while in wrong "
- "state %d\n",
- __func__,
- ireq->sm.current_state_id);
+ "state %d\n", __func__, ireq->sm.current_state_id);
break;
}
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index e845a31..8d55f78 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -102,6 +102,8 @@ struct isci_request {
#define IREQ_TERMINATED 1
#define IREQ_TMF 2
#define IREQ_ACTIVE 3
+ #define IREQ_PENDING_ABORT 4 /* Set == device was not suspended yet */
+ #define IREQ_TC_ABORT_POSTED 5
unsigned long flags;
/* XXX kill ttype and ttype_ptr, allocate full sas_task */
union ttype_ptr_union {
next prev parent reply other threads:[~2012-03-23 0:12 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-23 0:27 [isci-rnc PATCH v1 00/37] remote node context rework Dan Williams
2012-03-23 0:27 ` [isci-rnc PATCH v1 01/37] isci: Manage the link layer hang detect timer for RNC suspensions Dan Williams
2012-03-23 0:27 ` [isci-rnc PATCH v1 02/37] isci: Fixed bug in resumption from RNC Tx/Rx suspend state Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 03/37] isci: Handle all suspending TC completions Dan Williams
2012-03-23 0:28 ` Dan Williams [this message]
2012-03-23 0:28 ` [isci-rnc PATCH v1 05/37] isci: Manage device suspensions during TC terminations Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 06/37] isci: Remote device must be suspended for NCQ cleanup Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 07/37] isci: Remote device stop also suspends the RNC and terminates I/O Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 08/37] isci: Escalate to I_T_Nexus_Reset when the device is gone Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 09/37] isci: Redesign device suspension, abort, cleanup Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 10/37] isci: Add suspension cases for RNC INVALIDATING, POSTING states Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 11/37] isci: Device access in the error path does not depend on IDEV_GONE Dan Williams
2012-03-23 0:28 ` [isci-rnc PATCH v1 12/37] isci: All pending TCs are terminated when the RNC is invalidated Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 13/37] isci: Only set IDEV_GONE in the device stop path Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 14/37] isci: Remove isci_device reqs_in_process and dev_node from isci_device Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 15/37] isci: Distinguish between remote device suspension cases Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 16/37] isci: Fix the terminated I/O to not call sas_task_abort() Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 17/37] isci: Save the suspension hint for upcoming suspensions Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 18/37] isci: Manage the LLHANG timer enable/disable per-device Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 19/37] isci: Make sure all TCs are terminated and cleaned in LUN reset Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 20/37] isci: Implement waiting for suspend in the abort path Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 21/37] isci: When in the abort path, defeat other resume calls until done Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 22/37] isci: Callbacks to libsas occur under scic_lock and are synchronized Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 23/37] isci: Manage tag releases differently when aborting tasks Dan Williams
2012-03-23 0:29 ` [isci-rnc PATCH v1 24/37] isci: Fix RNC suspend call for SCI_RESUMING state Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 25/37] isci: Wait for RNC resumption before leaving the abort path Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 26/37] isci: Directly control IREQ_ABORT_PATH_ACTIVE when completing TMFs Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 27/37] isci: Add protocol indicator for TMF requests Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 28/37] isci: Added timeouts to RNC suspensions in the abort path Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 29/37] isci: Change the phy control and link reset interface for HW reasons Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 30/37] isci: Don't wait for an RNC suspend if it's being destroyed Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 31/37] isci: Restore the ATAPI device RNC management code Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 32/37] isci: Check IDEV_GONE before performing abort path operations Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 33/37] isci: Remove obviated host callback list Dan Williams
2012-03-23 0:30 ` [isci-rnc PATCH v1 34/37] isci: Manage the IREQ_NO_AUTO_FREE_TAG under scic_lock Dan Williams
2012-03-23 0:31 ` [isci-rnc PATCH v1 35/37] isci: Fix RNC AWAIT_SUSPENSION->INVALIDATING transition Dan Williams
2012-03-23 0:31 ` [isci-rnc PATCH v1 36/37] isci: Fixed RNC bug that lost the suspension or resumption during destroy Dan Williams
2012-03-23 0:31 ` [isci-rnc PATCH v1 37/37] isci: End the RNC resumption wait when the RNC is destroyed Dan Williams
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