isci: atomic device lookup and reference counting
We have unsafe references to remote devices that are notified to disappear at lldd_dev_gone. In order to clean this up we need a single canonical source for device lookups and stable references once a lookup succeeds. Towards that end guarantee that domain_device.lldd_dev is NULL as soon as we start the process of stopping a device. Any code path that wants to safely lookup a remote device must do so through task->dev->lldd_dev (isci_lookup_device()). For in-flight references outside of scic_lock we need reference counting to ensure that the device is not recycled before we are done with it. Simplify device back references to just scic_sds_request.target_device which is now the only permissible internal reference that is maintained relative to the reference count. There were two occasions where we wanted new i/o's to be treated as SAS_TASK_UNDELIVERED but where the domain_dev->lldd_dev link is still intact. Introduce a 'gone' flag to prevent i/o while waiting for libsas to take action on the port down event. One 'core' leftover is that we currently call scic_remote_device_destruct() from isci_remote_device_deconstruct() which is called when the 'core' says the device is stopped. It would be more natural for the final put to trigger isci_remote_device_deconstruct() but this implementation is deferred as it requires other changes. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
parent
360b03ed17
commit
209fae14fa
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@ -1327,8 +1327,8 @@ void isci_host_deinit(struct isci_host *ihost)
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struct isci_remote_device *idev, *d;
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list_for_each_entry_safe(idev, d, &iport->remote_dev_list, node) {
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isci_remote_device_change_state(idev, isci_stopping);
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isci_remote_device_stop(ihost, idev);
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if (test_bit(IDEV_ALLOCATED, &idev->flags))
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isci_remote_device_stop(ihost, idev);
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}
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}
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@ -321,8 +321,7 @@ static void isci_port_link_down(struct isci_host *isci_host,
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dev_dbg(&isci_host->pdev->dev,
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"%s: isci_device = %p\n",
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__func__, isci_device);
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isci_remote_device_change_state(isci_device,
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isci_stopping);
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set_bit(IDEV_GONE, &isci_device->flags);
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}
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}
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isci_port_change_state(isci_port, isci_stopping);
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@ -94,7 +94,7 @@ static void isci_remote_device_not_ready(struct isci_host *ihost,
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"%s: isci_device = %p\n", __func__, idev);
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if (reason == SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED)
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isci_remote_device_change_state(idev, isci_stopping);
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set_bit(IDEV_GONE, &idev->flags);
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else
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/* device ready is actually a "not ready for io" state. */
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isci_remote_device_change_state(idev, isci_ready);
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@ -449,8 +449,10 @@ static void scic_sds_remote_device_start_request(struct scic_sds_remote_device *
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/* cleanup requests that failed after starting on the port */
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if (status != SCI_SUCCESS)
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scic_sds_port_complete_io(sci_port, sci_dev, sci_req);
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else
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else {
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kref_get(&sci_dev_to_idev(sci_dev)->kref);
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scic_sds_remote_device_increment_request_count(sci_dev);
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}
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}
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enum sci_status scic_sds_remote_device_start_io(struct scic_sds_controller *scic,
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@ -656,6 +658,8 @@ enum sci_status scic_sds_remote_device_complete_io(struct scic_sds_controller *s
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"%s: Port:0x%p Device:0x%p Request:0x%p Status:0x%x "
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"could not complete\n", __func__, sci_port,
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sci_dev, sci_req, status);
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else
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isci_put_device(sci_dev_to_idev(sci_dev));
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return status;
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}
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@ -860,23 +864,11 @@ static void isci_remote_device_deconstruct(struct isci_host *ihost, struct isci_
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* here should go through isci_remote_device_nuke_requests.
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* If we hit this condition, we will need a way to complete
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* io requests in process */
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while (!list_empty(&idev->reqs_in_process)) {
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dev_err(&ihost->pdev->dev,
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"%s: ** request list not empty! **\n", __func__);
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BUG();
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}
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BUG_ON(!list_empty(&idev->reqs_in_process));
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scic_remote_device_destruct(&idev->sci);
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idev->domain_dev->lldd_dev = NULL;
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idev->domain_dev = NULL;
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idev->isci_port = NULL;
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list_del_init(&idev->node);
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clear_bit(IDEV_START_PENDING, &idev->flags);
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clear_bit(IDEV_STOP_PENDING, &idev->flags);
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clear_bit(IDEV_EH, &idev->flags);
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wake_up(&ihost->eventq);
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isci_put_device(idev);
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}
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/**
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@ -1314,6 +1306,22 @@ isci_remote_device_alloc(struct isci_host *ihost, struct isci_port *iport)
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return idev;
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}
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void isci_remote_device_release(struct kref *kref)
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{
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struct isci_remote_device *idev = container_of(kref, typeof(*idev), kref);
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struct isci_host *ihost = idev->isci_port->isci_host;
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idev->domain_dev = NULL;
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idev->isci_port = NULL;
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clear_bit(IDEV_START_PENDING, &idev->flags);
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clear_bit(IDEV_STOP_PENDING, &idev->flags);
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clear_bit(IDEV_GONE, &idev->flags);
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clear_bit(IDEV_EH, &idev->flags);
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smp_mb__before_clear_bit();
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clear_bit(IDEV_ALLOCATED, &idev->flags);
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wake_up(&ihost->eventq);
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}
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/**
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* isci_remote_device_stop() - This function is called internally to stop the
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* remote device.
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@ -1330,7 +1338,11 @@ enum sci_status isci_remote_device_stop(struct isci_host *ihost, struct isci_rem
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dev_dbg(&ihost->pdev->dev,
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"%s: isci_device = %p\n", __func__, idev);
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spin_lock_irqsave(&ihost->scic_lock, flags);
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idev->domain_dev->lldd_dev = NULL; /* disable new lookups */
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set_bit(IDEV_GONE, &idev->flags);
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isci_remote_device_change_state(idev, isci_stopping);
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spin_unlock_irqrestore(&ihost->scic_lock, flags);
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/* Kill all outstanding requests. */
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isci_remote_device_nuke_requests(ihost, idev);
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@ -1342,14 +1354,10 @@ enum sci_status isci_remote_device_stop(struct isci_host *ihost, struct isci_rem
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spin_unlock_irqrestore(&ihost->scic_lock, flags);
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/* Wait for the stop complete callback. */
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if (status == SCI_SUCCESS) {
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if (WARN_ONCE(status != SCI_SUCCESS, "failed to stop device\n"))
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/* nothing to wait for */;
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else
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wait_for_device_stop(ihost, idev);
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clear_bit(IDEV_ALLOCATED, &idev->flags);
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}
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dev_dbg(&ihost->pdev->dev,
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"%s: idev = %p - after completion wait\n",
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__func__, idev);
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return status;
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}
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@ -1416,39 +1424,33 @@ int isci_remote_device_found(struct domain_device *domain_dev)
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if (!isci_device)
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return -ENODEV;
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kref_init(&isci_device->kref);
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INIT_LIST_HEAD(&isci_device->node);
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domain_dev->lldd_dev = isci_device;
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spin_lock_irq(&isci_host->scic_lock);
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isci_device->domain_dev = domain_dev;
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isci_device->isci_port = isci_port;
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isci_remote_device_change_state(isci_device, isci_starting);
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spin_lock_irq(&isci_host->scic_lock);
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list_add_tail(&isci_device->node, &isci_port->remote_dev_list);
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set_bit(IDEV_START_PENDING, &isci_device->flags);
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status = isci_remote_device_construct(isci_port, isci_device);
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spin_unlock_irq(&isci_host->scic_lock);
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dev_dbg(&isci_host->pdev->dev,
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"%s: isci_device = %p\n",
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__func__, isci_device);
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if (status != SCI_SUCCESS) {
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spin_lock_irq(&isci_host->scic_lock);
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isci_remote_device_deconstruct(
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isci_host,
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isci_device
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);
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spin_unlock_irq(&isci_host->scic_lock);
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return -ENODEV;
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}
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if (status == SCI_SUCCESS) {
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/* device came up, advertise it to the world */
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domain_dev->lldd_dev = isci_device;
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} else
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isci_put_device(isci_device);
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spin_unlock_irq(&isci_host->scic_lock);
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/* wait for the device ready callback. */
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wait_for_device_start(isci_host, isci_device);
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return 0;
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return status == SCI_SUCCESS ? 0 : -ENODEV;
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}
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/**
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* isci_device_is_reset_pending() - This function will check if there is any
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@ -56,6 +56,7 @@
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#ifndef _ISCI_REMOTE_DEVICE_H_
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#define _ISCI_REMOTE_DEVICE_H_
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#include <scsi/libsas.h>
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#include <linux/kref.h>
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#include "scu_remote_node_context.h"
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#include "remote_node_context.h"
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#include "port.h"
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@ -134,7 +135,9 @@ struct isci_remote_device {
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#define IDEV_STOP_PENDING 1
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#define IDEV_ALLOCATED 2
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#define IDEV_EH 3
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#define IDEV_GONE 4
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unsigned long flags;
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struct kref kref;
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struct isci_port *isci_port;
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struct domain_device *domain_dev;
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struct list_head node;
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#define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000
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/* device reference routines must be called under scic_lock */
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static inline struct isci_remote_device *isci_lookup_device(struct domain_device *dev)
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{
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struct isci_remote_device *idev = dev->lldd_dev;
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if (idev && !test_bit(IDEV_GONE, &idev->flags)) {
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kref_get(&idev->kref);
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return idev;
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}
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return NULL;
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}
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void isci_remote_device_release(struct kref *kref);
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static inline void isci_put_device(struct isci_remote_device *idev)
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{
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if (idev)
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kref_put(&idev->kref, isci_remote_device_release);
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}
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enum sci_status isci_remote_device_stop(struct isci_host *ihost,
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struct isci_remote_device *idev);
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void isci_remote_device_nuke_requests(struct isci_host *ihost,
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@ -2313,7 +2313,7 @@ static void isci_request_set_open_reject_status(
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* none.
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*/
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static void isci_request_handle_controller_specific_errors(
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struct isci_remote_device *isci_device,
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struct isci_remote_device *idev,
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struct isci_request *request,
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struct sas_task *task,
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enum service_response *response_ptr,
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* that we ignore the quiesce state, since we are
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* concerned about the actual device state.
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*/
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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*status_ptr = SAS_DEVICE_UNKNOWN;
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else
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*status_ptr = SAS_ABORTED_TASK;
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/* Task in the target is not done. */
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*response_ptr = SAS_TASK_UNDELIVERED;
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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*status_ptr = SAS_DEVICE_UNKNOWN;
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else
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*status_ptr = SAM_STAT_TASK_ABORTED;
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* that we ignore the quiesce state, since we are
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* concerned about the actual device state.
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*/
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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*status_ptr = SAS_DEVICE_UNKNOWN;
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else
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*status_ptr = SAS_ABORTED_TASK;
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@ -2629,7 +2626,7 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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struct ssp_response_iu *resp_iu;
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void *resp_buf;
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unsigned long task_flags;
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struct isci_remote_device *isci_device = request->isci_device;
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struct isci_remote_device *idev = isci_lookup_device(task->dev);
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enum service_response response = SAS_TASK_UNDELIVERED;
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enum exec_status status = SAS_ABORTED_TASK;
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enum isci_request_status request_status;
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* that we ignore the quiesce state, since we are
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* concerned about the actual device state.
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*/
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if ((isci_device->status == isci_stopping)
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|| (isci_device->status == isci_stopped)
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)
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if (!idev)
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status = SAS_DEVICE_UNKNOWN;
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else
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status = SAS_ABORTED_TASK;
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@ -2697,8 +2692,7 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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request->complete_in_target = true;
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response = SAS_TASK_UNDELIVERED;
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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/* The device has been /is being stopped. Note that
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* we ignore the quiesce state, since we are
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* concerned about the actual device state.
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@ -2728,8 +2722,7 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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* that we ignore the quiesce state, since we are
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* concerned about the actual device state.
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*/
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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status = SAS_DEVICE_UNKNOWN;
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else
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status = SAS_ABORTED_TASK;
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* that we ignore the quiesce state, since we are
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* concerned about the actual device state.
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*/
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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status = SAS_DEVICE_UNKNOWN;
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else
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status = SAS_ABORTED_TASK;
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@ -2873,7 +2865,7 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR:
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isci_request_handle_controller_specific_errors(
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isci_device, request, task, &response, &status,
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idev, request, task, &response, &status,
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&complete_to_host);
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break;
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@ -2902,8 +2894,7 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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/* Fail the I/O so it can be retried. */
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response = SAS_TASK_UNDELIVERED;
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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status = SAS_DEVICE_UNKNOWN;
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else
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status = SAS_ABORTED_TASK;
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@ -2926,8 +2917,7 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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* that we ignore the quiesce state, since we are
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* concerned about the actual device state.
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*/
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if ((isci_device->status == isci_stopping) ||
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(isci_device->status == isci_stopped))
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if (!idev)
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status = SAS_DEVICE_UNKNOWN;
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else
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status = SAS_ABORTED_TASK;
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@ -2953,8 +2943,10 @@ static void isci_request_io_request_complete(struct isci_host *isci_host,
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/* complete the io request to the core. */
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scic_controller_complete_io(&isci_host->sci,
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&isci_device->sci,
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request->sci.target_device,
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&request->sci);
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isci_put_device(idev);
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/* set terminated handle so it cannot be completed or
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* terminated again, and to cause any calls into abort
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* task to recognize the already completed case.
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@ -3511,7 +3503,6 @@ static enum sci_status isci_io_request_build(
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}
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static struct isci_request *isci_request_alloc_core(struct isci_host *ihost,
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struct isci_remote_device *idev,
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gfp_t gfp_flags)
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{
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dma_addr_t handle;
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@ -3528,7 +3519,6 @@ static struct isci_request *isci_request_alloc_core(struct isci_host *ihost,
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spin_lock_init(&ireq->state_lock);
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ireq->request_daddr = handle;
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ireq->isci_host = ihost;
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ireq->isci_device = idev;
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ireq->io_request_completion = NULL;
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ireq->terminated = false;
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@ -3546,12 +3536,11 @@ static struct isci_request *isci_request_alloc_core(struct isci_host *ihost,
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static struct isci_request *isci_request_alloc_io(struct isci_host *ihost,
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struct sas_task *task,
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struct isci_remote_device *idev,
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gfp_t gfp_flags)
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{
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struct isci_request *ireq;
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ireq = isci_request_alloc_core(ihost, idev, gfp_flags);
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ireq = isci_request_alloc_core(ihost, gfp_flags);
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if (ireq) {
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||||
ireq->ttype_ptr.io_task_ptr = task;
|
||||
ireq->ttype = io_task;
|
||||
|
@ -3562,12 +3551,11 @@ static struct isci_request *isci_request_alloc_io(struct isci_host *ihost,
|
|||
|
||||
struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
|
||||
struct isci_tmf *isci_tmf,
|
||||
struct isci_remote_device *idev,
|
||||
gfp_t gfp_flags)
|
||||
{
|
||||
struct isci_request *ireq;
|
||||
|
||||
ireq = isci_request_alloc_core(ihost, idev, gfp_flags);
|
||||
ireq = isci_request_alloc_core(ihost, gfp_flags);
|
||||
if (ireq) {
|
||||
ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
|
||||
ireq->ttype = tmf_task;
|
||||
|
@ -3575,21 +3563,16 @@ struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
|
|||
return ireq;
|
||||
}
|
||||
|
||||
int isci_request_execute(struct isci_host *ihost, struct sas_task *task,
|
||||
gfp_t gfp_flags)
|
||||
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
|
||||
struct sas_task *task, gfp_t gfp_flags)
|
||||
{
|
||||
enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
|
||||
struct scic_sds_remote_device *sci_dev;
|
||||
struct isci_remote_device *idev;
|
||||
struct isci_request *ireq;
|
||||
unsigned long flags;
|
||||
int ret = 0;
|
||||
|
||||
idev = task->dev->lldd_dev;
|
||||
sci_dev = &idev->sci;
|
||||
|
||||
/* do common allocation and init of request object. */
|
||||
ireq = isci_request_alloc_io(ihost, task, idev, gfp_flags);
|
||||
ireq = isci_request_alloc_io(ihost, task, gfp_flags);
|
||||
if (!ireq)
|
||||
goto out;
|
||||
|
||||
|
@ -3605,8 +3588,7 @@ int isci_request_execute(struct isci_host *ihost, struct sas_task *task,
|
|||
spin_lock_irqsave(&ihost->scic_lock, flags);
|
||||
|
||||
/* send the request, let the core assign the IO TAG. */
|
||||
status = scic_controller_start_io(&ihost->sci, sci_dev,
|
||||
&ireq->sci,
|
||||
status = scic_controller_start_io(&ihost->sci, &idev->sci, &ireq->sci,
|
||||
SCI_CONTROLLER_INVALID_IO_TAG);
|
||||
if (status != SCI_SUCCESS &&
|
||||
status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
|
||||
|
|
|
@ -285,7 +285,6 @@ struct isci_request {
|
|||
struct isci_tmf *tmf_task_ptr; /* When ttype==tmf_task */
|
||||
} ttype_ptr;
|
||||
struct isci_host *isci_host;
|
||||
struct isci_remote_device *isci_device;
|
||||
/* For use in the requests_to_{complete|abort} lists: */
|
||||
struct list_head completed_node;
|
||||
/* For use in the reqs_in_process list: */
|
||||
|
@ -681,12 +680,10 @@ static inline void isci_request_free(struct isci_host *isci_host,
|
|||
|
||||
struct isci_request *isci_request_alloc_tmf(struct isci_host *ihost,
|
||||
struct isci_tmf *isci_tmf,
|
||||
struct isci_remote_device *idev,
|
||||
gfp_t gfp_flags);
|
||||
|
||||
int isci_request_execute(struct isci_host *isci_host,
|
||||
struct sas_task *task,
|
||||
gfp_t gfp_flags);
|
||||
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
|
||||
struct sas_task *task, gfp_t gfp_flags);
|
||||
|
||||
/**
|
||||
* isci_request_unmap_sgl() - This function unmaps the DMA address of a given
|
||||
|
|
|
@ -213,11 +213,10 @@ int isci_task_send_lu_reset_sata(
|
|||
|
||||
/* Send the soft reset to the target */
|
||||
#define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
|
||||
isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_high,
|
||||
NULL, NULL
|
||||
);
|
||||
isci_task_build_tmf(&tmf, isci_tmf_sata_srst_high, NULL, NULL);
|
||||
|
||||
ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_SRST_TIMEOUT_MS);
|
||||
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
|
||||
ISCI_SRST_TIMEOUT_MS);
|
||||
|
||||
if (ret != TMF_RESP_FUNC_COMPLETE) {
|
||||
dev_warn(&isci_host->pdev->dev,
|
||||
|
|
|
@ -146,7 +146,7 @@ static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
|
|||
int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
|
||||
{
|
||||
struct isci_host *ihost = dev_to_ihost(task->dev);
|
||||
struct isci_remote_device *device;
|
||||
struct isci_remote_device *idev;
|
||||
unsigned long flags;
|
||||
int ret;
|
||||
enum sci_status status;
|
||||
|
@ -166,11 +166,12 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
|
|||
dev_dbg(&ihost->pdev->dev,
|
||||
"task = %p, num = %d; dev = %p; cmd = %p\n",
|
||||
task, num, task->dev, task->uldd_task);
|
||||
spin_lock_irqsave(&ihost->scic_lock, flags);
|
||||
idev = isci_lookup_device(task->dev);
|
||||
spin_unlock_irqrestore(&ihost->scic_lock, flags);
|
||||
|
||||
device = task->dev->lldd_dev;
|
||||
|
||||
if (device)
|
||||
device_status = device->status;
|
||||
if (idev)
|
||||
device_status = idev->status;
|
||||
else
|
||||
device_status = isci_freed;
|
||||
|
||||
|
@ -188,7 +189,7 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
|
|||
__func__,
|
||||
task,
|
||||
isci_host_get_state(ihost),
|
||||
device,
|
||||
idev,
|
||||
device_status);
|
||||
|
||||
if (device_status == isci_ready) {
|
||||
|
@ -225,7 +226,7 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
|
|||
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
||||
|
||||
/* build and send the request. */
|
||||
status = isci_request_execute(ihost, task, gfp_flags);
|
||||
status = isci_request_execute(ihost, idev, task, gfp_flags);
|
||||
|
||||
if (status != SCI_SUCCESS) {
|
||||
|
||||
|
@ -248,33 +249,31 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
|
|||
}
|
||||
}
|
||||
}
|
||||
isci_put_device(idev);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct isci_request *isci_task_request_build(struct isci_host *ihost,
|
||||
struct isci_remote_device *idev,
|
||||
struct isci_tmf *isci_tmf)
|
||||
{
|
||||
struct scic_sds_remote_device *sci_dev;
|
||||
enum sci_status status = SCI_FAILURE;
|
||||
struct isci_request *ireq = NULL;
|
||||
struct isci_remote_device *idev;
|
||||
struct domain_device *dev;
|
||||
|
||||
dev_dbg(&ihost->pdev->dev,
|
||||
"%s: isci_tmf = %p\n", __func__, isci_tmf);
|
||||
|
||||
idev = isci_tmf->device;
|
||||
sci_dev = &idev->sci;
|
||||
dev = idev->domain_dev;
|
||||
|
||||
/* do common allocation and init of request object. */
|
||||
ireq = isci_request_alloc_tmf(ihost, isci_tmf, idev, GFP_ATOMIC);
|
||||
ireq = isci_request_alloc_tmf(ihost, isci_tmf, GFP_ATOMIC);
|
||||
if (!ireq)
|
||||
return NULL;
|
||||
|
||||
/* let the core do it's construct. */
|
||||
status = scic_task_request_construct(&ihost->sci, sci_dev,
|
||||
status = scic_task_request_construct(&ihost->sci, &idev->sci,
|
||||
SCI_CONTROLLER_INVALID_IO_TAG,
|
||||
&ireq->sci);
|
||||
|
||||
|
@ -309,25 +308,13 @@ static struct isci_request *isci_task_request_build(struct isci_host *ihost,
|
|||
return ireq;
|
||||
}
|
||||
|
||||
/**
|
||||
* isci_task_execute_tmf() - This function builds and sends a task request,
|
||||
* then waits for the completion.
|
||||
* @isci_host: This parameter specifies the ISCI host object
|
||||
* @tmf: This parameter is the pointer to the task management structure for
|
||||
* this request.
|
||||
* @timeout_ms: This parameter specifies the timeout period for the task
|
||||
* management request.
|
||||
*
|
||||
* TMF_RESP_FUNC_COMPLETE on successful completion of the TMF (this includes
|
||||
* error conditions reported in the IU status), or TMF_RESP_FUNC_FAILED.
|
||||
*/
|
||||
int isci_task_execute_tmf(struct isci_host *ihost, struct isci_tmf *tmf,
|
||||
unsigned long timeout_ms)
|
||||
int isci_task_execute_tmf(struct isci_host *ihost,
|
||||
struct isci_remote_device *isci_device,
|
||||
struct isci_tmf *tmf, unsigned long timeout_ms)
|
||||
{
|
||||
DECLARE_COMPLETION_ONSTACK(completion);
|
||||
enum sci_task_status status = SCI_TASK_FAILURE;
|
||||
struct scic_sds_remote_device *sci_device;
|
||||
struct isci_remote_device *isci_device = tmf->device;
|
||||
struct isci_request *ireq;
|
||||
int ret = TMF_RESP_FUNC_FAILED;
|
||||
unsigned long flags;
|
||||
|
@ -352,7 +339,7 @@ int isci_task_execute_tmf(struct isci_host *ihost, struct isci_tmf *tmf,
|
|||
/* Assign the pointer to the TMF's completion kernel wait structure. */
|
||||
tmf->complete = &completion;
|
||||
|
||||
ireq = isci_task_request_build(ihost, tmf);
|
||||
ireq = isci_task_request_build(ihost, isci_device, tmf);
|
||||
if (!ireq) {
|
||||
dev_warn(&ihost->pdev->dev,
|
||||
"%s: isci_task_request_build failed\n",
|
||||
|
@ -399,10 +386,9 @@ int isci_task_execute_tmf(struct isci_host *ihost, struct isci_tmf *tmf,
|
|||
if (tmf->cb_state_func != NULL)
|
||||
tmf->cb_state_func(isci_tmf_timed_out, tmf, tmf->cb_data);
|
||||
|
||||
status = scic_controller_terminate_request(
|
||||
&ireq->isci_host->sci,
|
||||
&ireq->isci_device->sci,
|
||||
&ireq->sci);
|
||||
status = scic_controller_terminate_request(&ihost->sci,
|
||||
&isci_device->sci,
|
||||
&ireq->sci);
|
||||
|
||||
spin_unlock_irqrestore(&ihost->scic_lock, flags);
|
||||
}
|
||||
|
@ -437,65 +423,32 @@ int isci_task_execute_tmf(struct isci_host *ihost, struct isci_tmf *tmf,
|
|||
|
||||
void isci_task_build_tmf(
|
||||
struct isci_tmf *tmf,
|
||||
struct isci_remote_device *isci_device,
|
||||
enum isci_tmf_function_codes code,
|
||||
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
|
||||
struct isci_tmf *,
|
||||
void *),
|
||||
void *cb_data)
|
||||
{
|
||||
dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
|
||||
"%s: isci_device = %p\n", __func__, isci_device);
|
||||
|
||||
memset(tmf, 0, sizeof(*tmf));
|
||||
|
||||
tmf->device = isci_device;
|
||||
tmf->tmf_code = code;
|
||||
|
||||
tmf->cb_state_func = tmf_sent_cb;
|
||||
tmf->cb_data = cb_data;
|
||||
}
|
||||
|
||||
static void isci_task_build_abort_task_tmf(
|
||||
struct isci_tmf *tmf,
|
||||
struct isci_remote_device *isci_device,
|
||||
enum isci_tmf_function_codes code,
|
||||
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
|
||||
struct isci_tmf *,
|
||||
void *),
|
||||
struct isci_request *old_request)
|
||||
{
|
||||
isci_task_build_tmf(tmf, isci_device, code, tmf_sent_cb,
|
||||
isci_task_build_tmf(tmf, code, tmf_sent_cb,
|
||||
(void *)old_request);
|
||||
tmf->io_tag = old_request->io_tag;
|
||||
}
|
||||
|
||||
static struct isci_request *isci_task_get_request_from_task(
|
||||
struct sas_task *task,
|
||||
struct isci_remote_device **isci_device)
|
||||
{
|
||||
|
||||
struct isci_request *request = NULL;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&task->task_state_lock, flags);
|
||||
|
||||
request = task->lldd_task;
|
||||
|
||||
/* If task is already done, the request isn't valid */
|
||||
if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
|
||||
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
|
||||
(request != NULL)) {
|
||||
|
||||
if (isci_device != NULL)
|
||||
*isci_device = request->isci_device;
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
||||
|
||||
return request;
|
||||
}
|
||||
|
||||
/**
|
||||
* isci_task_validate_request_to_abort() - This function checks the given I/O
|
||||
* against the "started" state. If the request is still "started", it's
|
||||
|
@ -858,11 +811,10 @@ static int isci_task_send_lu_reset_sas(
|
|||
* value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
|
||||
* was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
|
||||
*/
|
||||
isci_task_build_tmf(&tmf, isci_device, isci_tmf_ssp_lun_reset, NULL,
|
||||
NULL);
|
||||
isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL);
|
||||
|
||||
#define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
|
||||
ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
|
||||
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
|
||||
|
||||
if (ret == TMF_RESP_FUNC_COMPLETE)
|
||||
dev_dbg(&isci_host->pdev->dev,
|
||||
|
@ -888,33 +840,33 @@ static int isci_task_send_lu_reset_sas(
|
|||
int isci_task_lu_reset(struct domain_device *domain_device, u8 *lun)
|
||||
{
|
||||
struct isci_host *isci_host = dev_to_ihost(domain_device);
|
||||
struct isci_remote_device *isci_device = NULL;
|
||||
struct isci_remote_device *isci_device;
|
||||
unsigned long flags;
|
||||
int ret;
|
||||
bool device_stopping = false;
|
||||
|
||||
isci_device = domain_device->lldd_dev;
|
||||
spin_lock_irqsave(&isci_host->scic_lock, flags);
|
||||
isci_device = isci_lookup_device(domain_device);
|
||||
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
|
||||
|
||||
dev_dbg(&isci_host->pdev->dev,
|
||||
"%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
|
||||
__func__, domain_device, isci_host, isci_device);
|
||||
|
||||
if (isci_device != NULL) {
|
||||
device_stopping = (isci_device->status == isci_stopping)
|
||||
|| (isci_device->status == isci_stopped);
|
||||
if (isci_device)
|
||||
set_bit(IDEV_EH, &isci_device->flags);
|
||||
}
|
||||
|
||||
/* If there is a device reset pending on any request in the
|
||||
* device's list, fail this LUN reset request in order to
|
||||
* escalate to the device reset.
|
||||
*/
|
||||
if (!isci_device || device_stopping ||
|
||||
if (!isci_device ||
|
||||
isci_device_is_reset_pending(isci_host, isci_device)) {
|
||||
dev_warn(&isci_host->pdev->dev,
|
||||
"%s: No dev (%p), or "
|
||||
"RESET PENDING: domain_device=%p\n",
|
||||
__func__, isci_device, domain_device);
|
||||
return TMF_RESP_FUNC_FAILED;
|
||||
ret = TMF_RESP_FUNC_FAILED;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Send the task management part of the reset. */
|
||||
|
@ -929,6 +881,8 @@ int isci_task_lu_reset(struct domain_device *domain_device, u8 *lun)
|
|||
isci_terminate_pending_requests(isci_host,
|
||||
isci_device);
|
||||
|
||||
out:
|
||||
isci_put_device(isci_device);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
@ -1023,60 +977,54 @@ int isci_task_abort_task(struct sas_task *task)
|
|||
int ret = TMF_RESP_FUNC_FAILED;
|
||||
unsigned long flags;
|
||||
bool any_dev_reset = false;
|
||||
bool device_stopping;
|
||||
|
||||
/* Get the isci_request reference from the task. Note that
|
||||
* this check does not depend on the pending request list
|
||||
* in the device, because tasks driving resets may land here
|
||||
* after completion in the core.
|
||||
*/
|
||||
old_request = isci_task_get_request_from_task(task, &isci_device);
|
||||
spin_lock_irqsave(&isci_host->scic_lock, flags);
|
||||
spin_lock(&task->task_state_lock);
|
||||
|
||||
old_request = task->lldd_task;
|
||||
|
||||
/* If task is already done, the request isn't valid */
|
||||
if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
|
||||
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
|
||||
old_request)
|
||||
isci_device = isci_lookup_device(task->dev);
|
||||
|
||||
spin_unlock(&task->task_state_lock);
|
||||
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
|
||||
|
||||
dev_dbg(&isci_host->pdev->dev,
|
||||
"%s: task = %p\n", __func__, task);
|
||||
|
||||
/* Check if the device has been / is currently being removed.
|
||||
* If so, no task management will be done, and the I/O will
|
||||
* be terminated.
|
||||
*/
|
||||
device_stopping = (isci_device->status == isci_stopping)
|
||||
|| (isci_device->status == isci_stopped);
|
||||
if (!isci_device || !old_request)
|
||||
goto out;
|
||||
|
||||
/* XXX need to fix device lookup lifetime (needs to be done
|
||||
* under scic_lock, among other things...), but for now assume
|
||||
* the device is available like the above code
|
||||
*/
|
||||
set_bit(IDEV_EH, &isci_device->flags);
|
||||
|
||||
/* This version of the driver will fail abort requests for
|
||||
* SATA/STP. Failing the abort request this way will cause the
|
||||
* SCSI error handler thread to escalate to LUN reset
|
||||
*/
|
||||
if (sas_protocol_ata(task->task_proto) && !device_stopping) {
|
||||
if (sas_protocol_ata(task->task_proto)) {
|
||||
dev_warn(&isci_host->pdev->dev,
|
||||
" task %p is for a STP/SATA device;"
|
||||
" returning TMF_RESP_FUNC_FAILED\n"
|
||||
" to cause a LUN reset...\n", task);
|
||||
return TMF_RESP_FUNC_FAILED;
|
||||
goto out;
|
||||
}
|
||||
|
||||
dev_dbg(&isci_host->pdev->dev,
|
||||
"%s: old_request == %p\n", __func__, old_request);
|
||||
|
||||
if (!device_stopping)
|
||||
any_dev_reset = isci_device_is_reset_pending(isci_host,isci_device);
|
||||
any_dev_reset = isci_device_is_reset_pending(isci_host,isci_device);
|
||||
|
||||
spin_lock_irqsave(&task->task_state_lock, flags);
|
||||
|
||||
/* Don't do resets to stopping devices. */
|
||||
if (device_stopping) {
|
||||
|
||||
task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
|
||||
any_dev_reset = false;
|
||||
|
||||
} else /* See if there is a pending device reset for this device. */
|
||||
any_dev_reset = any_dev_reset
|
||||
|| (task->task_state_flags & SAS_TASK_NEED_DEV_RESET);
|
||||
any_dev_reset = any_dev_reset || (task->task_state_flags & SAS_TASK_NEED_DEV_RESET);
|
||||
|
||||
/* If the extraction of the request reference from the task
|
||||
* failed, then the request has been completed (or if there is a
|
||||
|
@ -1130,8 +1078,7 @@ int isci_task_abort_task(struct sas_task *task)
|
|||
"%s: abort task not needed for %p\n",
|
||||
__func__, task);
|
||||
}
|
||||
|
||||
return ret;
|
||||
goto out;
|
||||
}
|
||||
else
|
||||
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
||||
|
@ -1158,11 +1105,10 @@ int isci_task_abort_task(struct sas_task *task)
|
|||
"%s: device = %p; old_request %p already being aborted\n",
|
||||
__func__,
|
||||
isci_device, old_request);
|
||||
|
||||
return TMF_RESP_FUNC_COMPLETE;
|
||||
ret = TMF_RESP_FUNC_COMPLETE;
|
||||
goto out;
|
||||
}
|
||||
if ((task->task_proto == SAS_PROTOCOL_SMP)
|
||||
|| device_stopping
|
||||
|| old_request->complete_in_target
|
||||
) {
|
||||
|
||||
|
@ -1170,10 +1116,9 @@ int isci_task_abort_task(struct sas_task *task)
|
|||
|
||||
dev_dbg(&isci_host->pdev->dev,
|
||||
"%s: SMP request (%d)"
|
||||
" or device is stopping (%d)"
|
||||
" or complete_in_target (%d), thus no TMF\n",
|
||||
__func__, (task->task_proto == SAS_PROTOCOL_SMP),
|
||||
device_stopping, old_request->complete_in_target);
|
||||
old_request->complete_in_target);
|
||||
|
||||
/* Set the state on the task. */
|
||||
isci_task_all_done(task);
|
||||
|
@ -1185,15 +1130,14 @@ int isci_task_abort_task(struct sas_task *task)
|
|||
*/
|
||||
} else {
|
||||
/* Fill in the tmf stucture */
|
||||
isci_task_build_abort_task_tmf(&tmf, isci_device,
|
||||
isci_tmf_ssp_task_abort,
|
||||
isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
|
||||
isci_abort_task_process_cb,
|
||||
old_request);
|
||||
|
||||
spin_unlock_irqrestore(&isci_host->scic_lock, flags);
|
||||
|
||||
#define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* half second timeout. */
|
||||
ret = isci_task_execute_tmf(isci_host, &tmf,
|
||||
ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
|
||||
ISCI_ABORT_TASK_TIMEOUT_MS);
|
||||
|
||||
if (ret != TMF_RESP_FUNC_COMPLETE)
|
||||
|
@ -1212,6 +1156,8 @@ int isci_task_abort_task(struct sas_task *task)
|
|||
|
||||
/* Make sure we do not leave a reference to aborted_io_completion */
|
||||
old_request->io_request_completion = NULL;
|
||||
out:
|
||||
isci_put_device(isci_device);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
@ -1305,7 +1251,6 @@ isci_task_request_complete(struct isci_host *ihost,
|
|||
struct isci_request *ireq,
|
||||
enum sci_task_status completion_status)
|
||||
{
|
||||
struct isci_remote_device *idev = ireq->isci_device;
|
||||
struct isci_tmf *tmf = isci_request_access_tmf(ireq);
|
||||
struct completion *tmf_complete;
|
||||
struct scic_sds_request *sci_req = &ireq->sci;
|
||||
|
@ -1332,7 +1277,7 @@ isci_task_request_complete(struct isci_host *ihost,
|
|||
/* PRINT_TMF( ((struct isci_tmf *)request->task)); */
|
||||
tmf_complete = tmf->complete;
|
||||
|
||||
scic_controller_complete_io(&ihost->sci, &idev->sci, &ireq->sci);
|
||||
scic_controller_complete_io(&ihost->sci, ireq->sci.target_device, &ireq->sci);
|
||||
/* set the 'terminated' flag handle to make sure it cannot be terminated
|
||||
* or completed again.
|
||||
*/
|
||||
|
@ -1583,11 +1528,10 @@ static void isci_wait_for_smp_phy_reset(struct isci_remote_device *idev, int phy
|
|||
dev_dbg(&ihost->pdev->dev, "%s: done\n", __func__);
|
||||
}
|
||||
|
||||
static int isci_reset_device(struct domain_device *dev, int hard_reset)
|
||||
static int isci_reset_device(struct isci_host *ihost,
|
||||
struct isci_remote_device *idev, int hard_reset)
|
||||
{
|
||||
struct isci_remote_device *idev = dev->lldd_dev;
|
||||
struct sas_phy *phy = sas_find_local_phy(dev);
|
||||
struct isci_host *ihost = dev_to_ihost(dev);
|
||||
struct sas_phy *phy = sas_find_local_phy(idev->domain_dev);
|
||||
struct isci_port *iport = idev->isci_port;
|
||||
enum sci_status status;
|
||||
unsigned long flags;
|
||||
|
@ -1595,14 +1539,6 @@ static int isci_reset_device(struct domain_device *dev, int hard_reset)
|
|||
|
||||
dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
|
||||
|
||||
if (!idev) {
|
||||
dev_warn(&ihost->pdev->dev,
|
||||
"%s: idev is GONE!\n",
|
||||
__func__);
|
||||
|
||||
return TMF_RESP_FUNC_COMPLETE; /* Nothing to reset. */
|
||||
}
|
||||
|
||||
spin_lock_irqsave(&ihost->scic_lock, flags);
|
||||
status = scic_remote_device_reset(&idev->sci);
|
||||
if (status != SCI_SUCCESS) {
|
||||
|
@ -1662,35 +1598,50 @@ static int isci_reset_device(struct domain_device *dev, int hard_reset)
|
|||
int isci_task_I_T_nexus_reset(struct domain_device *dev)
|
||||
{
|
||||
struct isci_host *ihost = dev_to_ihost(dev);
|
||||
int ret = TMF_RESP_FUNC_FAILED, hard_reset = 1;
|
||||
struct isci_remote_device *idev;
|
||||
int ret, hard_reset = 1;
|
||||
unsigned long flags;
|
||||
|
||||
/* XXX mvsas is not protecting against ->lldd_dev_gone(), are we
|
||||
* being too paranoid, or is mvsas busted?!
|
||||
*/
|
||||
spin_lock_irqsave(&ihost->scic_lock, flags);
|
||||
idev = dev->lldd_dev;
|
||||
if (!idev || !test_bit(IDEV_EH, &idev->flags))
|
||||
ret = TMF_RESP_FUNC_COMPLETE;
|
||||
idev = isci_lookup_device(dev);
|
||||
spin_unlock_irqrestore(&ihost->scic_lock, flags);
|
||||
|
||||
if (ret == TMF_RESP_FUNC_COMPLETE)
|
||||
return ret;
|
||||
if (!idev || !test_bit(IDEV_EH, &idev->flags)) {
|
||||
ret = TMF_RESP_FUNC_COMPLETE;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
|
||||
hard_reset = 0;
|
||||
|
||||
return isci_reset_device(dev, hard_reset);
|
||||
ret = isci_reset_device(ihost, idev, hard_reset);
|
||||
out:
|
||||
isci_put_device(idev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int isci_bus_reset_handler(struct scsi_cmnd *cmd)
|
||||
{
|
||||
struct domain_device *dev = sdev_to_domain_dev(cmd->device);
|
||||
int hard_reset = 1;
|
||||
struct isci_host *ihost = dev_to_ihost(dev);
|
||||
struct isci_remote_device *idev;
|
||||
int ret, hard_reset = 1;
|
||||
unsigned long flags;
|
||||
|
||||
if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
|
||||
hard_reset = 0;
|
||||
|
||||
return isci_reset_device(dev, hard_reset);
|
||||
spin_lock_irqsave(&ihost->scic_lock, flags);
|
||||
idev = isci_lookup_device(dev);
|
||||
spin_unlock_irqrestore(&ihost->scic_lock, flags);
|
||||
|
||||
if (!idev) {
|
||||
ret = TMF_RESP_FUNC_COMPLETE;
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = isci_reset_device(ihost, idev, hard_reset);
|
||||
out:
|
||||
isci_put_device(idev);
|
||||
return ret;
|
||||
}
|
||||
|
|
|
@ -213,18 +213,15 @@ int isci_bus_reset_handler(struct scsi_cmnd *cmd);
|
|||
|
||||
void isci_task_build_tmf(
|
||||
struct isci_tmf *tmf,
|
||||
struct isci_remote_device *isci_device,
|
||||
enum isci_tmf_function_codes code,
|
||||
void (*tmf_sent_cb)(enum isci_tmf_cb_state,
|
||||
struct isci_tmf *,
|
||||
void *),
|
||||
void *cb_data);
|
||||
|
||||
|
||||
int isci_task_execute_tmf(
|
||||
struct isci_host *isci_host,
|
||||
struct isci_tmf *tmf,
|
||||
unsigned long timeout_ms);
|
||||
int isci_task_execute_tmf(struct isci_host *isci_host,
|
||||
struct isci_remote_device *idev,
|
||||
struct isci_tmf *tmf, unsigned long timeout_ms);
|
||||
|
||||
/**
|
||||
* enum isci_completion_selection - This enum defines the possible actions to
|
||||
|
|
Loading…
Reference in a new issue