*
*/
+#include <linux/kthread.h>
+
#include "sas_internal.h"
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"
#include "../scsi_transport_api.h"
+#include "../scsi_priv.h"
#include <linux/err.h>
#include <linux/blkdev.h>
+#include <linux/freezer.h>
#include <linux/scatterlist.h>
/* ---------- SCSI Host glue ---------- */
hs = DID_NO_CONNECT;
break;
case SAS_DATA_UNDERRUN:
- sc->resid = ts->residual;
- if (sc->request_bufflen - sc->resid < sc->underflow)
+ scsi_set_resid(sc, ts->residual);
+ if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
hs = DID_ERROR;
break;
case SAS_DATA_OVERRUN:
if (cmd->request && blk_rq_tagged(cmd->request)) {
if (cmd->device->ordered_tags &&
(cmd->request->cmd_flags & REQ_HARDBARRIER))
- ta = TASK_ATTR_HOQ;
+ ta = TASK_ATTR_ORDERED;
}
return ta;
}
task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
- task->scatter = cmd->request_buffer;
- task->num_scatter = cmd->use_sg;
- task->total_xfer_len = cmd->request_bufflen;
+ task->scatter = scsi_sglist(cmd);
+ task->num_scatter = scsi_sg_count(cmd);
+ task->total_xfer_len = scsi_bufflen(cmd);
task->data_dir = cmd->sc_data_direction;
task->task_done = sas_scsi_task_done;
list_add_tail(&task->list, &core->task_queue);
core->task_queue_size += 1;
spin_unlock_irqrestore(&core->task_queue_lock, flags);
- up(&core->queue_thread_sema);
+ wake_up_process(core->queue_thread);
return 0;
}
TASK_IS_ABORTED,
TASK_IS_AT_LU,
TASK_IS_NOT_AT_LU,
+ TASK_ABORT_FAILED,
};
static enum task_disposition sas_scsi_find_task(struct sas_task *task)
spin_unlock_irqrestore(&core->task_queue_lock, flags);
}
- spin_lock_irqsave(&task->task_state_lock, flags);
- if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
- spin_unlock_irqrestore(&task->task_state_lock, flags);
- SAS_DPRINTK("%s: task 0x%p already aborted\n",
- __FUNCTION__, task);
- return TASK_IS_ABORTED;
- }
- spin_unlock_irqrestore(&task->task_state_lock, flags);
-
for (i = 0; i < 5; i++) {
SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
res = si->dft->lldd_abort_task(task);
SAS_DPRINTK("%s: querying task 0x%p\n",
__FUNCTION__, task);
res = si->dft->lldd_query_task(task);
- if (res == TMF_RESP_FUNC_SUCC) {
+ switch (res) {
+ case TMF_RESP_FUNC_SUCC:
SAS_DPRINTK("%s: task 0x%p at LU\n",
__FUNCTION__, task);
return TASK_IS_AT_LU;
- } else if (res == TMF_RESP_FUNC_COMPLETE) {
+ case TMF_RESP_FUNC_COMPLETE:
SAS_DPRINTK("%s: task 0x%p not at LU\n",
__FUNCTION__, task);
return TASK_IS_NOT_AT_LU;
- }
+ case TMF_RESP_FUNC_FAILED:
+ SAS_DPRINTK("%s: task 0x%p failed to abort\n",
+ __FUNCTION__, task);
+ return TASK_ABORT_FAILED;
+ }
+
}
}
return res;
return res;
}
-void sas_scsi_recover_host(struct Scsi_Host *shost)
+/* Find the sas_phy that's attached to this device */
+struct sas_phy *find_local_sas_phy(struct domain_device *dev)
+{
+ struct domain_device *pdev = dev->parent;
+ struct ex_phy *exphy = NULL;
+ int i;
+
+ /* Directly attached device */
+ if (!pdev)
+ return dev->port->phy;
+
+ /* Otherwise look in the expander */
+ for (i = 0; i < pdev->ex_dev.num_phys; i++)
+ if (!memcmp(dev->sas_addr,
+ pdev->ex_dev.ex_phy[i].attached_sas_addr,
+ SAS_ADDR_SIZE)) {
+ exphy = &pdev->ex_dev.ex_phy[i];
+ break;
+ }
+
+ BUG_ON(!exphy);
+ return exphy->phy;
+}
+
+/* Attempt to send a LUN reset message to a device */
+int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_internal *i =
+ to_sas_internal(dev->port->ha->core.shost->transportt);
+ struct scsi_lun lun;
+ int res;
+
+ int_to_scsilun(cmd->device->lun, &lun);
+
+ if (!i->dft->lldd_lu_reset)
+ return FAILED;
+
+ res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
+ if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
+ return SUCCESS;
+
+ return FAILED;
+}
+
+/* Attempt to send a phy (bus) reset */
+int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
+{
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_phy *phy = find_local_sas_phy(dev);
+ int res;
+
+ res = sas_phy_reset(phy, 1);
+ if (res)
+ SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
+ phy->dev.kobj.k_name,
+ res);
+ if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
+ return SUCCESS;
+
+ return FAILED;
+}
+
+/* Try to reset a device */
+static int try_to_reset_cmd_device(struct Scsi_Host *shost,
+ struct scsi_cmnd *cmd)
+{
+ int res;
+
+ if (!shost->hostt->eh_device_reset_handler)
+ goto try_bus_reset;
+
+ res = shost->hostt->eh_device_reset_handler(cmd);
+ if (res == SUCCESS)
+ return res;
+
+try_bus_reset:
+ if (shost->hostt->eh_bus_reset_handler)
+ return shost->hostt->eh_bus_reset_handler(cmd);
+
+ return FAILED;
+}
+
+static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
+ struct list_head *work_q,
+ struct list_head *done_q)
{
- struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
- unsigned long flags;
- LIST_HEAD(error_q);
struct scsi_cmnd *cmd, *n;
enum task_disposition res = TASK_IS_DONE;
- int tmf_resp;
+ int tmf_resp, need_reset;
struct sas_internal *i = to_sas_internal(shost->transportt);
+ unsigned long flags;
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
- spin_lock_irqsave(shost->host_lock, flags);
- list_splice_init(&shost->eh_cmd_q, &error_q);
- spin_unlock_irqrestore(shost->host_lock, flags);
-
- SAS_DPRINTK("Enter %s\n", __FUNCTION__);
-
- /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
- * by sas_scsi_timed_out() callback.
- */
Again:
- SAS_DPRINTK("going over list...\n");
- list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
+ list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
struct sas_task *task = TO_SAS_TASK(cmd);
- list_del_init(&cmd->eh_entry);
- if (!task) {
- SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
+ if (!task)
continue;
- }
+
+ list_del_init(&cmd->eh_entry);
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
SAS_DPRINTK("trying to find task 0x%p\n", task);
res = sas_scsi_find_task(task);
SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
task);
task->task_done(task);
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
continue;
case TASK_IS_ABORTED:
SAS_DPRINTK("%s: task 0x%p is aborted\n",
__FUNCTION__, task);
task->task_done(task);
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
continue;
case TASK_IS_AT_LU:
SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
SAS_ADDR(task->dev),
cmd->device->lun);
task->task_done(task);
- sas_scsi_clear_queue_lu(&error_q, cmd);
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
+ sas_scsi_clear_queue_lu(work_q, cmd);
goto Again;
}
/* fallthrough */
case TASK_IS_NOT_AT_LU:
+ case TASK_ABORT_FAILED:
SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
task);
tmf_resp = sas_recover_I_T(task->dev);
SAS_DPRINTK("I_T %016llx recovered\n",
SAS_ADDR(task->dev->sas_addr));
task->task_done(task);
- sas_scsi_clear_queue_I_T(&error_q, task->dev);
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
+ sas_scsi_clear_queue_I_T(work_q, task->dev);
goto Again;
}
/* Hammer time :-) */
SAS_DPRINTK("clear nexus port:%d "
"succeeded\n", port->id);
task->task_done(task);
- sas_scsi_clear_queue_port(&error_q,
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
+ sas_scsi_clear_queue_port(work_q,
port);
goto Again;
}
SAS_DPRINTK("clear nexus ha "
"succeeded\n");
task->task_done(task);
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
goto out;
}
}
cmd->device->lun);
task->task_done(task);
+ if (need_reset)
+ try_to_reset_cmd_device(shost, cmd);
goto clear_q;
}
}
out:
- scsi_eh_flush_done_q(&ha->eh_done_q);
- SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
- return;
+ return list_empty(work_q);
clear_q:
SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
- list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
+ list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
struct sas_task *task = TO_SAS_TASK(cmd);
list_del_init(&cmd->eh_entry);
task->task_done(task);
}
+ return list_empty(work_q);
+}
+
+void sas_scsi_recover_host(struct Scsi_Host *shost)
+{
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
+ unsigned long flags;
+ LIST_HEAD(eh_work_q);
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ list_splice_init(&shost->eh_cmd_q, &eh_work_q);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
+ SAS_DPRINTK("Enter %s\n", __FUNCTION__);
+ /*
+ * Deal with commands that still have SAS tasks (i.e. they didn't
+ * complete via the normal sas_task completion mechanism)
+ */
+ if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
+ goto out;
+
+ /*
+ * Now deal with SCSI commands that completed ok but have a an error
+ * code (and hopefully sense data) attached. This is roughly what
+ * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
+ * command we see here has no sas_task and is thus unknown to the HA.
+ */
+ if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
+ scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
+
+out:
+ scsi_eh_flush_done_q(&ha->eh_done_q);
+ SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
+ return;
}
enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
unsigned long flags;
if (!task) {
- SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n",
- cmd, task);
- return EH_HANDLED;
+ cmd->timeout_per_command /= 2;
+ SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
+ cmd, task, (cmd->timeout_per_command ?
+ "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
+ if (!cmd->timeout_per_command)
+ return EH_NOT_HANDLED;
+ return EH_RESET_TIMER;
}
spin_lock_irqsave(&task->task_state_lock, flags);
- if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
- spin_unlock_irqrestore(&task->task_state_lock, flags);
- SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: "
- "EH_NOT_HANDLED\n", cmd, task);
- return EH_NOT_HANDLED;
- }
+ BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
struct domain_device *found_dev = NULL;
int i;
+ unsigned long flags;
- spin_lock(&ha->phy_port_lock);
+ spin_lock_irqsave(&ha->phy_port_lock, flags);
for (i = 0; i < ha->num_phys; i++) {
struct asd_sas_port *port = ha->sas_port[i];
struct domain_device *dev;
spin_unlock(&port->dev_list_lock);
}
found:
- spin_unlock(&ha->phy_port_lock);
+ spin_unlock_irqrestore(&ha->phy_port_lock, flags);
return found_dev;
}
scsi_deactivate_tcq(scsi_dev, 1);
}
+ scsi_dev->allow_restart = 1;
+
return 0;
}
struct sas_internal *i = to_sas_internal(core->shost->transportt);
spin_lock_irqsave(&core->task_queue_lock, flags);
- while (!core->queue_thread_kill &&
+ while (!kthread_should_stop() &&
!list_empty(&core->task_queue)) {
can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
spin_unlock_irqrestore(&core->task_queue_lock, flags);
}
-static DECLARE_COMPLETION(queue_th_comp);
-
/**
* sas_queue_thread -- The Task Collector thread
* @_sas_ha: pointer to struct sas_ha
static int sas_queue_thread(void *_sas_ha)
{
struct sas_ha_struct *sas_ha = _sas_ha;
- struct scsi_core *core = &sas_ha->core;
-
- daemonize("sas_queue_%d", core->shost->host_no);
- current->flags |= PF_NOFREEZE;
-
- complete(&queue_th_comp);
while (1) {
- down_interruptible(&core->queue_thread_sema);
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
sas_queue(sas_ha);
- if (core->queue_thread_kill)
+ if (kthread_should_stop())
break;
}
- complete(&queue_th_comp);
-
return 0;
}
int sas_init_queue(struct sas_ha_struct *sas_ha)
{
- int res;
struct scsi_core *core = &sas_ha->core;
spin_lock_init(&core->task_queue_lock);
core->task_queue_size = 0;
INIT_LIST_HEAD(&core->task_queue);
- init_MUTEX_LOCKED(&core->queue_thread_sema);
-
- res = kernel_thread(sas_queue_thread, sas_ha, 0);
- if (res >= 0)
- wait_for_completion(&queue_th_comp);
- return res < 0 ? res : 0;
+ core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
+ "sas_queue_%d", core->shost->host_no);
+ if (IS_ERR(core->queue_thread))
+ return PTR_ERR(core->queue_thread);
+ return 0;
}
void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
struct scsi_core *core = &sas_ha->core;
struct sas_task *task, *n;
- init_completion(&queue_th_comp);
- core->queue_thread_kill = 1;
- up(&core->queue_thread_sema);
- wait_for_completion(&queue_th_comp);
+ kthread_stop(core->queue_thread);
if (!list_empty(&core->task_queue))
SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
spin_unlock_irqrestore(&core->task_queue_lock, flags);
}
-static int do_sas_task_abort(struct sas_task *task)
+/*
+ * Call the LLDD task abort routine directly. This function is intended for
+ * use by upper layers that need to tell the LLDD to abort a task.
+ */
+int __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) {
+ if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
+ task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
- SAS_DPRINTK("%s: Task %p already aborted.\n", __FUNCTION__,
+ SAS_DPRINTK("%s: Task %p already finished.\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;
+ 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);
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
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);
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+ task->task_done(task);
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 work_struct *work)
+/*
+ * Tell an upper layer that it needs to initiate an abort for a given task.
+ * This should only ever be called by an LLDD.
+ */
+void sas_task_abort(struct sas_task *task)
{
- struct sas_task *task =
- container_of(work, struct sas_task, abort_work);
- int i;
+ struct scsi_cmnd *sc = task->uldd_task;
- for (i = 0; i < 5; i++)
- if (!do_sas_task_abort(task))
+ /* Escape for libsas internal commands */
+ if (!sc) {
+ if (!del_timer(&task->timer))
return;
+ task->timer.function(task->timer.data);
+ return;
+ }
- SAS_DPRINTK("%s: Could not kill task!\n", __FUNCTION__);
+ scsi_req_abort_cmd(sc);
+ scsi_schedule_eh(sc->device->host);
}
EXPORT_SYMBOL_GPL(sas_queuecommand);
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);
EXPORT_SYMBOL_GPL(sas_task_abort);
EXPORT_SYMBOL_GPL(sas_phy_reset);
EXPORT_SYMBOL_GPL(sas_phy_enable);
+EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
+EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff