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authorDarrick J. Wong <djwong@us.ibm.com>2006-10-30 15:18:50 -0800
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-11-15 12:27:50 -0600
commit79a5eb609b74e7b3638861c41b98eafa74920a1f (patch)
tree741a6fc22589b991d05ceaa755cc05577efe08b2 /drivers/scsi/libsas
parentf456393e195e0aa16029985f63cd93b601a0d315 (diff)
[SCSI] libsas: add sas_abort_task
This patch adds an external function, sas_abort_task, to enable LLDDs to abort sas_tasks. It also adds a work_struct so that the actual work of aborting a task can be shifted from tasklet context (in the LLDD) onto the scsi_host's workqueue. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_scsi_host.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 6a97b07849b..c5fd3752272 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -33,6 +33,7 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"
+#include "../scsi_transport_api.h"
#include <linux/err.h>
#include <linux/blkdev.h>
@@ -798,6 +799,64 @@ void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
spin_unlock_irqrestore(&core->task_queue_lock, flags);
}
+static int do_sas_task_abort(struct sas_task *task)
+{
+ struct scsi_cmnd *sc = task->uldd_task;
+ struct sas_internal *si =
+ to_sas_internal(task->dev->port->ha->core.shost->transportt);
+ unsigned long flags;
+ int res;
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+ SAS_DPRINTK("%s: Task %p already aborted.\n", __FUNCTION__,
+ task);
+ return 0;
+ }
+
+ task->task_state_flags |= SAS_TASK_INITIATOR_ABORTED;
+ if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
+ task->task_state_flags |= SAS_TASK_STATE_ABORTED;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ if (!si->dft->lldd_abort_task)
+ return -ENODEV;
+
+ res = si->dft->lldd_abort_task(task);
+ if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
+ (res == TMF_RESP_FUNC_COMPLETE))
+ {
+ /* SMP commands don't have scsi_cmds(?) */
+ if (!sc) {
+ task->task_done(task);
+ return 0;
+ }
+ scsi_req_abort_cmd(sc);
+ scsi_schedule_eh(sc->device->host);
+ return 0;
+ }
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ task->task_state_flags &= ~SAS_TASK_INITIATOR_ABORTED;
+ if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
+ task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ return -EAGAIN;
+}
+
+void sas_task_abort(struct sas_task *task)
+{
+ int i;
+
+ for (i = 0; i < 5; i++)
+ if (!do_sas_task_abort(task))
+ return;
+
+ SAS_DPRINTK("%s: Could not kill task!\n", __FUNCTION__);
+}
+
EXPORT_SYMBOL_GPL(sas_queuecommand);
EXPORT_SYMBOL_GPL(sas_target_alloc);
EXPORT_SYMBOL_GPL(sas_slave_configure);
@@ -805,3 +864,4 @@ EXPORT_SYMBOL_GPL(sas_slave_destroy);
EXPORT_SYMBOL_GPL(sas_change_queue_depth);
EXPORT_SYMBOL_GPL(sas_change_queue_type);
EXPORT_SYMBOL_GPL(sas_bios_param);
+EXPORT_SYMBOL_GPL(sas_task_abort);