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isci: Redesign device suspension, abort, cleanup.

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This commit changes the means by which outstanding I/Os are handled
for cleanup.
The likelihood is that this commit will be broken into smaller pieces,
however that will be a later revision.  Among the changes:

- All completion structures have been removed from the tmf and
abort paths.
- Now using one completed I/O list, with the I/O completed in host bit being
used to select error or normal callback 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 22:41:54 -08:00
committed by Dan Williams
parent d80ecd5726
commit 14aaa9f0a3
11 changed files with 432 additions and 1488 deletions
Download Patch File Download Diff File Expand all files Collapse all files

257
drivers/scsi/isci/remote_device.c
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@@ -80,49 +80,6 @@ static enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev
NULL, NULL);
}
/**
* isci_remote_device_not_ready() - This function is called by the ihost when
* the remote device is not ready. We mark the isci device as ready (not
* "ready_for_io") and signal the waiting proccess.
* @isci_host: This parameter specifies the isci host object.
* @isci_device: This parameter specifies the remote device
*
* sci_lock is held on entrance to this function.
*/
static void isci_remote_device_not_ready(struct isci_host *ihost,
struct isci_remote_device *idev, u32 reason)
{
struct isci_request *ireq;
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p\n", __func__, idev);
switch (reason) {
case SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED:
set_bit(IDEV_GONE, &idev->flags);
break;
case SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED:
set_bit(IDEV_IO_NCQERROR, &idev->flags);
/* Suspend the remote device so the I/O can be terminated. */
sci_remote_device_suspend(idev);
/* Kill all outstanding requests for the device. */
list_for_each_entry(ireq, &idev->reqs_in_process, dev_node) {
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p request = %p\n",
__func__, idev, ireq);
sci_controller_terminate_request(ihost, idev, ireq);
}
/* Fall through into the default case... */
default:
clear_bit(IDEV_IO_READY, &idev->flags);
break;
}
}
/**
* isci_remote_device_ready() - This function is called by the ihost when the
* remote device is ready. We mark the isci device as ready and signal the
@@ -142,49 +99,121 @@ static void isci_remote_device_ready(struct isci_host *ihost, struct isci_remote
wake_up(&ihost->eventq);
}
static int isci_remote_device_suspendcheck(struct isci_remote_device *idev)
static enum sci_status sci_remote_device_terminate_req(
struct isci_host *ihost,
struct isci_remote_device *idev,
int check_abort,
struct isci_request *ireq)
{
return test_bit(IDEV_TXRX_SUSPENDED, &idev->flags)
|| !test_bit(IDEV_ALLOCATED, &idev->flags);
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p; flags=%lx; req=%p; req target=%p\n",
__func__, idev, idev->flags, ireq, ireq->target_device);
if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
(ireq->target_device != idev) ||
(check_abort && !test_bit(IREQ_PENDING_ABORT, &ireq->flags)))
return SCI_SUCCESS;
set_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags);
return sci_controller_terminate_request(ihost, idev, ireq);
}
enum sci_status isci_remote_device_suspend(
struct isci_host *ihost,
struct isci_remote_device *idev)
static enum sci_status sci_remote_device_terminate_reqs_checkabort(
struct isci_remote_device *idev,
int chk)
{
enum sci_status status;
struct isci_host *ihost = idev->owning_port->owning_controller;
enum sci_status status = SCI_SUCCESS;
u32 i;
for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) {
struct isci_request *ireq = ihost->reqs[i];
enum sci_status s;
s = sci_remote_device_terminate_req(ihost, idev, chk, ireq);
if (s != SCI_SUCCESS)
status = s;
}
return status;
}
enum sci_status isci_remote_device_terminate_requests(
struct isci_host *ihost,
struct isci_remote_device *idev,
struct isci_request *ireq)
{
enum sci_status status = SCI_SUCCESS;
unsigned long flags;
spin_lock_irqsave(&ihost->scic_lock, flags);
if (isci_get_device(idev->domain_dev) == NULL) {
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 {
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,
isci_remote_device_suspendcheck(idev));
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!>");
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p, ireq=%p; started_request_count=%d, "
"about to wait\n",
__func__, idev, ireq, idev->started_request_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));
} else
dev_dbg(scirdev_to_dev(idev),
"%s: sci_remote_device_suspend failed, "
"status = %d\n", __func__, status);
} 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);
}
dev_dbg(&ihost->pdev->dev, "%s: idev=%p, wait done\n",
__func__, idev);
isci_put_device(idev);
}
return status;
}
/**
* isci_remote_device_not_ready() - This function is called by the ihost when
* the remote device is not ready. We mark the isci device as ready (not
* "ready_for_io") and signal the waiting proccess.
* @isci_host: This parameter specifies the isci host object.
* @isci_device: This parameter specifies the remote device
*
* sci_lock is held on entrance to this function.
*/
static void isci_remote_device_not_ready(struct isci_host *ihost,
struct isci_remote_device *idev,
u32 reason)
{
dev_dbg(&ihost->pdev->dev,
"%s: isci_device = %p\n", __func__, idev);
switch (reason) {
case SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED:
set_bit(IDEV_GONE, &idev->flags);
break;
case SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED:
set_bit(IDEV_IO_NCQERROR, &idev->flags);
/* Suspend the remote device so the I/O can be terminated. */
sci_remote_device_suspend(idev);
/* Kill all outstanding requests for the device. */
sci_remote_device_terminate_requests(idev);
/* Fall through into the default case... */
default:
clear_bit(IDEV_IO_READY, &idev->flags);
break;
}
}
/* called once the remote node context is ready to be freed.
* The remote device can now report that its stop operation is complete. none
*/
@@ -196,36 +225,10 @@ static void rnc_destruct_done(void *_dev)
sci_change_state(&idev->sm, SCI_DEV_STOPPED);
}
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;
u32 i;
for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) {
struct isci_request *ireq = ihost->reqs[i];
enum sci_status s;
if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
(ireq->target_device != idev) ||
(check_abort_pending && !test_bit(IREQ_PENDING_ABORT,
&ireq->flags)))
continue;
s = sci_controller_terminate_request(ihost, idev, ireq);
if (s != SCI_SUCCESS)
status = s;
}
return status;
}
enum sci_status sci_remote_device_terminate_requests(
struct isci_remote_device *idev)
{
return sci_remote_device_terminate_requests_checkabort(idev, 0);
return sci_remote_device_terminate_reqs_checkabort(idev, 0);
}
enum sci_status sci_remote_device_stop(struct isci_remote_device *idev,
@@ -771,10 +774,6 @@ enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_task(&idev->rnc, ireq);
if (status != SCI_SUCCESS)
goto out;
status = sci_request_start(ireq);
if (status != SCI_SUCCESS)
goto out;
@@ -796,8 +795,9 @@ enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
sci_remote_node_context_suspend(
&idev->rnc, SCI_SOFTWARE_SUSPENSION,
SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT, NULL, NULL);
sci_remote_node_context_resume(
&idev->rnc, sci_remote_device_continue_request, idev);
status = sci_remote_node_context_start_task(&idev->rnc, ireq,
sci_remote_device_continue_request, idev);
out:
sci_remote_device_start_request(idev, ireq, status);
@@ -811,7 +811,9 @@ enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
if (status != SCI_SUCCESS)
return status;
status = sci_remote_node_context_start_task(&idev->rnc, ireq);
/* Resume the RNC as needed: */
status = sci_remote_node_context_start_task(&idev->rnc, ireq,
NULL, NULL);
if (status != SCI_SUCCESS)
break;
@@ -1322,20 +1324,6 @@ static enum sci_status isci_remote_device_construct(struct isci_port *iport,
return status;
}
void isci_remote_device_nuke_requests(struct isci_host *ihost, struct isci_remote_device *idev)
{
DECLARE_COMPLETION_ONSTACK(aborted_task_completion);
dev_dbg(&ihost->pdev->dev,
"%s: idev = %p\n", __func__, idev);
/* Cleanup all requests pending for this device. */
isci_terminate_pending_requests(ihost, idev);
dev_dbg(&ihost->pdev->dev,
"%s: idev = %p, done\n", __func__, idev);
}
/**
* This function builds the isci_remote_device when a libsas dev_found message
* is received.
@@ -1495,32 +1483,28 @@ int isci_remote_device_found(struct domain_device *dev)
return status == SCI_SUCCESS ? 0 : -ENODEV;
}
enum sci_status isci_remote_device_reset(
enum sci_status isci_remote_device_suspend_terminate(
struct isci_host *ihost,
struct isci_remote_device *idev)
struct isci_remote_device *idev,
struct isci_request *ireq)
{
unsigned long flags;
enum sci_status status;
/* Put the device into a reset state so the suspension will not
* automatically resume.
*/
/* Put the device into suspension. */
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_reset(idev);
sci_remote_device_suspend(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
if (status != SCI_SUCCESS) {
/* Terminate and wait for the completions. */
status = isci_remote_device_terminate_requests(ihost, idev, ireq);
if (status != SCI_SUCCESS)
dev_dbg(&ihost->pdev->dev,
"%s: sci_remote_device_reset(%p) returned %d!\n",
"%s: isci_remote_device_terminate_requests(%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);
}
/* NOTE: RNC resumption is left to the caller! */
return status;
}
@@ -1533,7 +1517,7 @@ int isci_remote_device_is_safe_to_abort(
enum sci_status sci_remote_device_abort_requests_pending_abort(
struct isci_remote_device *idev)
{
return sci_remote_device_terminate_requests_checkabort(idev, 1);
return sci_remote_device_terminate_reqs_checkabort(idev, 1);
}
enum sci_status isci_remote_device_reset_complete(
@@ -1545,7 +1529,6 @@ enum sci_status isci_remote_device_reset_complete(
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;