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isci: Manage device suspensions during TC terminations.

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TCs must be terminated only while the RNC is suspended.  This commit
adds remote device suspensions and resumptions in the abort, reset and
termination paths.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jeff Skirvin 2012-03-08 22:41:51 -08:00 committed by Dan Williams
parent 726980d569
commit 5b6bf225e7
3 changed files with 155 additions and 50 deletions
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92
drivers/scsi/isci/remote_device.c
View file

@ -143,6 +143,12 @@ static enum sci_status sci_remote_device_suspend(
NULL, NULL);
}
static int isci_remote_device_suspendcheck(struct isci_remote_device *idev)
{
return test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
|| !test_bit(IDEV_ALLOCATED, &idev->flags);
}
enum sci_status isci_remote_device_suspend(
struct isci_host *ihost,
struct isci_remote_device *idev)
@ -151,18 +157,18 @@ enum sci_status isci_remote_device_suspend(
unsigned long flags;
spin_lock_irqsave(&ihost->scic_lock, flags);
if (isci_lookup_device(idev->domain_dev) == NULL) {
if (isci_get_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) {
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p, about to wait\n",
__func__, idev);
wait_event(ihost->eventq,
test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
|| !test_bit(IDEV_ALLOCATED, &idev->flags));
isci_remote_device_suspendcheck(idev));
status = test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
? SCI_SUCCESS : SCI_FAILURE;
dev_dbg(&ihost->pdev->dev,
@ -171,7 +177,10 @@ enum sci_status isci_remote_device_suspend(
test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
? "<suspended>" : "<deallocated!>");
}
} else
dev_dbg(scirdev_to_dev(idev),
"%s: sci_remote_device_suspend failed, "
"status = %d\n", __func__, status);
isci_put_device(idev);
}
return status;
@ -1218,6 +1227,35 @@ static enum sci_status sci_remote_device_ea_construct(struct isci_port *iport,
return SCI_SUCCESS;
}
enum sci_status sci_remote_device_resume(
struct isci_remote_device *idev,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum sci_status status;
status = sci_remote_node_context_resume(&idev->rnc, cb_fn, cb_p);
if (status != SCI_SUCCESS)
dev_dbg(scirdev_to_dev(idev), "%s: failed to resume: %d\n",
__func__, status);
return status;
}
enum sci_status isci_remote_device_resume(
struct isci_host *ihost,
struct isci_remote_device *idev,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
unsigned long flags;
enum sci_status status;
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_resume(idev, cb_fn, cb_p);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
return status;
}
/**
* sci_remote_device_start() - This method will start the supplied remote
* device. This method enables normal IO requests to flow through to the
@ -1244,9 +1282,8 @@ static enum sci_status sci_remote_device_start(struct isci_remote_device *idev,
return SCI_FAILURE_INVALID_STATE;
}
status = sci_remote_node_context_resume(&idev->rnc,
remote_device_resume_done,
idev);
status = sci_remote_device_resume(idev, remote_device_resume_done,
idev);
if (status != SCI_SUCCESS)
return status;
@ -1461,20 +1498,15 @@ int isci_remote_device_found(struct domain_device *dev)
}
enum sci_status isci_remote_device_reset(
struct isci_host *ihost,
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;
}
/* Put the device into a reset state so the suspension will not
* automatically resume.
*/
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_reset(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
@ -1482,6 +1514,14 @@ enum sci_status isci_remote_device_reset(
dev_dbg(&ihost->pdev->dev,
"%s: sci_remote_device_reset(%p) returned %d!\n",
__func__, idev, status);
return 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;
}
@ -1497,3 +1537,19 @@ enum sci_status sci_remote_device_abort_requests_pending_abort(
{
return sci_remote_device_terminate_requests_checkabort(idev, 1);
}
enum sci_status isci_remote_device_reset_complete(
struct isci_host *ihost,
struct isci_remote_device *idev)
{
unsigned long flags;
enum sci_status status;
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_reset_complete(idev);
sci_remote_device_resume(idev, NULL, NULL);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
return status;
}

33
drivers/scsi/isci/remote_device.h
View file

@ -106,6 +106,16 @@ struct isci_remote_device {
#define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
/* device reference routines must be called under sci_lock */
static inline struct isci_remote_device *isci_get_device(
struct domain_device *dev)
{
struct isci_remote_device *idev = dev->lldd_dev;
if (idev)
kref_get(&idev->kref);
return idev;
}
static inline struct isci_remote_device *isci_lookup_device(struct domain_device *dev)
{
struct isci_remote_device *idev = dev->lldd_dev;
@ -345,4 +355,27 @@ int isci_remote_device_is_safe_to_abort(
enum sci_status
sci_remote_device_abort_requests_pending_abort(
struct isci_remote_device *idev);
enum sci_status isci_remote_device_suspend(
struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status sci_remote_device_resume(
struct isci_remote_device *idev,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p);
enum sci_status isci_remote_device_resume(
struct isci_host *ihost,
struct isci_remote_device *idev,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p);
enum sci_status isci_remote_device_reset(
struct isci_host *ihost,
struct isci_remote_device *idev);
enum sci_status isci_remote_device_reset_complete(
struct isci_host *ihost,
struct isci_remote_device *idev);
#endif /* !defined(_ISCI_REMOTE_DEVICE_H_) */

80
drivers/scsi/isci/task.c
View file

@ -716,6 +716,8 @@ void isci_terminate_pending_requests(struct isci_host *ihost,
unsigned long flags;
LIST_HEAD(list);
isci_remote_device_suspend(ihost, idev);
spin_lock_irqsave(&ihost->scic_lock, flags);
list_splice_init(&idev->reqs_in_process, &list);
@ -826,40 +828,47 @@ static int isci_task_send_lu_reset_sas(
int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
{
struct isci_host *isci_host = dev_to_ihost(dev);
struct isci_host *ihost = dev_to_ihost(dev);
struct isci_remote_device *isci_device;
unsigned long flags;
int ret;
spin_lock_irqsave(&isci_host->scic_lock, flags);
spin_lock_irqsave(&ihost->scic_lock, flags);
isci_device = isci_lookup_device(dev);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
dev_dbg(&ihost->pdev->dev,
"%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
__func__, dev, isci_host, isci_device);
__func__, dev, ihost, isci_device);
if (!isci_device) {
/* If the device is gone, stop the escalations. */
dev_dbg(&isci_host->pdev->dev, "%s: No dev\n", __func__);
dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
ret = TMF_RESP_FUNC_COMPLETE;
goto out;
}
if (isci_remote_device_suspend(ihost, isci_device) != SCI_SUCCESS) {
dev_dbg(&ihost->pdev->dev,
"%s: device = %p; failed to suspend\n",
__func__, isci_device);
ret = TMF_RESP_FUNC_FAILED;
goto out;
}
/* Send the task management part of the reset. */
if (dev_is_sata(dev)) {
sas_ata_schedule_reset(dev);
ret = TMF_RESP_FUNC_COMPLETE;
} else
ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
ret = isci_task_send_lu_reset_sas(ihost, isci_device, lun);
/* If the LUN reset worked, all the I/O can now be terminated. */
if (ret == TMF_RESP_FUNC_COMPLETE)
if (ret == TMF_RESP_FUNC_COMPLETE) {
/* Terminate all I/O now. */
isci_terminate_pending_requests(isci_host,
isci_device);
isci_terminate_pending_requests(ihost, isci_device);
isci_remote_device_resume(ihost, isci_device, NULL, NULL);
}
out:
isci_put_device(isci_device);
return ret;
@ -976,7 +985,7 @@ int isci_task_abort_task(struct sas_task *task)
spin_unlock(&task->task_state_lock);
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
dev_warn(&isci_host->pdev->dev,
"%s: dev = %p, task = %p, old_request == %p\n",
__func__, isci_device, task, old_request);
@ -998,7 +1007,7 @@ int isci_task_abort_task(struct sas_task *task)
ret = TMF_RESP_FUNC_COMPLETE;
dev_dbg(&isci_host->pdev->dev,
dev_warn(&isci_host->pdev->dev,
"%s: abort task not needed for %p\n",
__func__, task);
goto out;
@ -1022,7 +1031,7 @@ int isci_task_abort_task(struct sas_task *task)
/* The request was already being handled by someone else (because
* they got to set the state away from started).
*/
dev_dbg(&isci_host->pdev->dev,
dev_warn(&isci_host->pdev->dev,
"%s: device = %p; old_request %p already being aborted\n",
__func__,
isci_device, old_request);
@ -1035,7 +1044,7 @@ int isci_task_abort_task(struct sas_task *task)
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
dev_dbg(&isci_host->pdev->dev,
dev_warn(&isci_host->pdev->dev,
"%s: %s request"
" or complete_in_target (%d), thus no TMF\n",
__func__,
@ -1068,6 +1077,15 @@ int isci_task_abort_task(struct sas_task *task)
*/
perform_termination = 1;
if (isci_device && !test_bit(IDEV_GONE, &isci_device->flags) &&
(isci_remote_device_suspend(isci_host, isci_device)
!= SCI_SUCCESS)) {
dev_warn(&isci_host->pdev->dev,
"%s: device = %p; failed to suspend\n",
__func__, isci_device);
goto out;
}
} else {
/* Fill in the tmf stucture */
isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
@ -1076,6 +1094,14 @@ int isci_task_abort_task(struct sas_task *task)
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
if (isci_remote_device_suspend(isci_host, isci_device)
!= SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"%s: device = %p; failed to suspend\n",
__func__, isci_device);
goto out;
}
#define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
ISCI_ABORT_TASK_TIMEOUT_MS);
@ -1083,7 +1109,7 @@ int isci_task_abort_task(struct sas_task *task)
if (ret == TMF_RESP_FUNC_COMPLETE)
perform_termination = 1;
else
dev_dbg(&isci_host->pdev->dev,
dev_warn(&isci_host->pdev->dev,
"%s: isci_task_send_tmf failed\n", __func__);
}
if (perform_termination) {
@ -1094,6 +1120,7 @@ int isci_task_abort_task(struct sas_task *task)
*/
isci_terminate_request_core(isci_host, isci_device,
old_request);
isci_remote_device_resume(isci_host, isci_device, NULL, NULL);
}
/* Make sure we do not leave a reference to aborted_io_completion */
@ -1251,21 +1278,13 @@ static int isci_reset_device(struct isci_host *ihost,
struct isci_remote_device *idev)
{
int rc;
unsigned long flags;
enum sci_status status;
struct sas_phy *phy = sas_get_local_phy(dev);
struct isci_port *iport = dev->port->lldd_port;
dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
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);
if (isci_remote_device_reset(ihost, idev) != SCI_SUCCESS) {
rc = TMF_RESP_FUNC_FAILED;
goto out;
}
@ -1281,15 +1300,12 @@ static int isci_reset_device(struct isci_host *ihost,
isci_remote_device_nuke_requests(ihost, idev);
/* Since all pending TCs have been cleaned, resume the RNC. */
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_reset_complete(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
status = isci_remote_device_reset_complete(ihost, idev);
if (status != SCI_SUCCESS) {
if (status != SCI_SUCCESS)
dev_dbg(&ihost->pdev->dev,
"%s: sci_remote_device_reset_complete(%p) "
"%s: isci_remote_device_reset_complete(%p) "
"returned %d!\n", __func__, idev, status);
}
dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
out:
@ -1305,7 +1321,7 @@ int isci_task_I_T_nexus_reset(struct domain_device *dev)
int ret;
spin_lock_irqsave(&ihost->scic_lock, flags);
idev = isci_lookup_device(dev);
idev = isci_get_device(dev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (!idev) {