Hi Dan, Thanks for your fix, I do test this with new patchset, this works good for me. Only one thing confuse me, kernel sometimes print cmd timed out when disk attached. Like : " [ 312.732468] sd 4:0:11:0: [sdl] command ffff88032c6eaa00 timed out [ 312.753114] sd 4:0:13:0: [sdn] command ffff88032c6eb000 timed out [ 312.753257] sd 4:0:4:0: [sde] command ffff88032903e800 timed out [ 312.753266] sd 4:0:14:0: [sdo] command ffff880329284c00 timed out [ 312.755304] sd 4:0:1:0: [sdb] command ffff8801b4b80600 timed out [ 312.797458] sd 4:0:15:0: [sdp] command ffff880329285900 timed out " Although, this is no harm. Jack > > The latest version of the patch kit is available here: > > git://git.kernel.org/pub/scm/linux/kernel/git/djbw/isci.git > libsas-eh-reworks-v4 > > Changes since v3: http://marc.info/?l=linux-scsi&m=132581455214789&w=2 > > 1/ null pointer regression smp_execute_task: make sure device is not > removed from the domain while eh is in flight. Fix up the logic that > defers domain_device destruction to its own context. Folded into: > "libsas: prevent domain rediscovery competing with ata error handling" > plus a small prep patch: "libsas: convert dev->gone to flags" > > 2/ lockdep regression in smp_execute_task: failed to release the lock > before returning. Folded into: "libsas: check for 'gone' expanders in > smp_execute_task()" > > 3/ unnecessary locking in isci_ata_check_ready(). Folded into: "isci: > ->lldd_ata_check_ready handler" > > 4/ two new fixes follow in separate mails > [PATCH v4 1/2] libsas: pre-clean commands that won the eh vs completion race > [PATCH v4 2/2] libsas: feed the scsi_block_when_processing_errors() meter > > Incremental diff: libsas-eh-reworks-v3..libsas-eh-reworks-v4 > > diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c > index e795645..eca9ba0 100644 > --- a/drivers/scsi/isci/port.c > +++ b/drivers/scsi/isci/port.c > @@ -1681,10 +1681,7 @@ int isci_ata_check_ready(struct domain_device *dev) > if (test_bit(IPORT_RESET_PENDING, &iport->state)) > goto out; > > - /* snapshot active phy mask */ > - spin_lock_irqsave(&ihost->scic_lock, flags); > rc = !!iport->active_phy_mask; > - spin_unlock_irqrestore(&ihost->scic_lock, flags); > out: > isci_put_device(idev); > > diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c > index f90fdcf..a062adc 100644 > --- a/drivers/scsi/libsas/sas_ata.c > +++ b/drivers/scsi/libsas/sas_ata.c > @@ -195,7 +195,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd > *qc) > spin_unlock(ap->lock); > > /* If the device fell off, no sense in issuing commands */ > - if (dev->gone) > + if (test_bit(SAS_DEV_GONE, &dev->state)) > goto out; > > task = sas_alloc_task(GFP_ATOMIC); > @@ -327,7 +327,7 @@ static int sas_ata_hard_reset(struct ata_link *link, > unsigned int *class, > struct domain_device *dev = ap->private_data; > struct sas_internal *i = dev_to_sas_internal(dev); > > - if (dev->gone) > + if (test_bit(SAS_DEV_GONE, &dev->state)) > return -ENODEV; > > res = i->dft->lldd_I_T_nexus_reset(dev); > @@ -663,6 +663,11 @@ static void async_sas_ata_eh(void *data, async_cookie_t > cookie) > > ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error > handler"); > ata_scsi_port_error_handler(ha->core.shost, ap); > + > + /* tell scsi_block_when_processing_errors() waiters that we are > + * still making forward progress > + */ > + wake_up(&ha->core.shost->host_wait); > } > > void sas_ata_strategy_handler(struct Scsi_Host *shost) > diff --git a/drivers/scsi/libsas/sas_discover.c > b/drivers/scsi/libsas/sas_discover.c > index 0b7555d..dfb0250 100644 > --- a/drivers/scsi/libsas/sas_discover.c > +++ b/drivers/scsi/libsas/sas_discover.c > @@ -269,17 +269,22 @@ static void sas_destruct_devices(struct work_struct > *work) > > clear_bit(DISCE_DESTRUCT, &port->disc.pending); > > - list_for_each_entry_safe(dev, n, &port->destroy_list, dev_list_node) { > + list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) > { > + list_del_init(&dev->disco_list_node); > + > sas_remove_children(&dev->rphy->dev); > sas_rphy_delete(dev->rphy); > dev->rphy = NULL; > sas_unregister_common_dev(port, dev); > + > + sas_put_device(dev); > } > } > > void sas_unregister_dev(struct asd_sas_port *port, struct domain_device > *dev) > { > - if (!list_empty(&dev->disco_list_node)) { > + if (!test_bit(SAS_DEV_DESTROY, &dev->state) && > + !list_empty(&dev->disco_list_node)) { > /* this rphy never saw sas_rphy_add */ > list_del_init(&dev->disco_list_node); > sas_rphy_free(dev->rphy); > @@ -287,13 +292,9 @@ void sas_unregister_dev(struct asd_sas_port *port, struct > domain_device *dev) > sas_unregister_common_dev(port, dev); > } > > - if (dev->rphy) { > + if (dev->rphy && !test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) { > sas_rphy_unlink(dev->rphy); > - > - spin_lock_irq(&port->dev_list_lock); > - list_move_tail(&dev->dev_list_node, &port->destroy_list); > - spin_unlock_irq(&port->dev_list_lock); > - > + list_move_tail(&dev->disco_list_node, &port->destroy_list); > sas_discover_event(dev->port, DISCE_DESTRUCT); > } > } > diff --git a/drivers/scsi/libsas/sas_expander.c > b/drivers/scsi/libsas/sas_expander.c > index e47599b..68a80a0 100644 > --- a/drivers/scsi/libsas/sas_expander.c > +++ b/drivers/scsi/libsas/sas_expander.c > @@ -74,8 +74,10 @@ static int smp_execute_task(struct domain_device *dev, void > *req, int req_size, > > mutex_lock(&dev->ex_dev.cmd_mutex); > for (retry = 0; retry < 3; retry++) { > - if (dev->gone) > - return -ECOMM; > + if (test_bit(SAS_DEV_GONE, &dev->state)) { > + res = -ECOMM; > + break; > + } > > task = sas_alloc_task(GFP_KERNEL); > if (!task) { > @@ -1794,7 +1796,7 @@ static void sas_unregister_ex_tree(struct asd_sas_port > *port, struct domain_devi > struct domain_device *child, *n; > > list_for_each_entry_safe(child, n, &ex->children, siblings) { > - child->gone = 1; > + set_bit(SAS_DEV_GONE, &child->state); > if (child->dev_type == EDGE_DEV || > child->dev_type == FANOUT_DEV) > sas_unregister_ex_tree(port, child); > @@ -1815,7 +1817,7 @@ static void sas_unregister_devs_sas_addr(struct > domain_device *parent, > &ex_dev->children, siblings) { > if (SAS_ADDR(child->sas_addr) == > SAS_ADDR(phy->attached_sas_addr)) { > - child->gone = 1; > + set_bit(SAS_DEV_GONE, &child->state); > if (child->dev_type == EDGE_DEV || > child->dev_type == FANOUT_DEV) > sas_unregister_ex_tree(parent->port, child); > diff --git a/drivers/scsi/libsas/sas_port.c > b/drivers/scsi/libsas/sas_port.c > index 36e2905..31adcd1 100644 > --- a/drivers/scsi/libsas/sas_port.c > +++ b/drivers/scsi/libsas/sas_port.c > @@ -168,7 +168,7 @@ void sas_deform_port(struct asd_sas_phy *phy, int gone) > > if (port->num_phys == 1) { > if (dev && gone) > - dev->gone = 1; > + set_bit(SAS_DEV_GONE, &dev->state); > sas_unregister_domain_devices(port); > sas_port_delete(port->port); > port->port = NULL; > diff --git a/drivers/scsi/libsas/sas_scsi_host.c > b/drivers/scsi/libsas/sas_scsi_host.c > index 59a227d..731c892 100644 > --- a/drivers/scsi/libsas/sas_scsi_host.c > +++ b/drivers/scsi/libsas/sas_scsi_host.c > @@ -208,7 +208,7 @@ int sas_queuecommand(struct Scsi_Host *host, struct > scsi_cmnd *cmd) > int res = 0; > > /* If the device fell off, no sense in issuing commands */ > - if (dev->gone) { > + if (test_bit(SAS_DEV_GONE, &dev->state)) { > cmd->result = DID_BAD_TARGET << 16; > goto out_done; > } > @@ -249,8 +249,8 @@ out_done: > > static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) > { > - struct sas_task *task = TO_SAS_TASK(cmd); > struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host); > + struct sas_task *task = TO_SAS_TASK(cmd); > > /* At this point, we only get called following an actual abort > * of the task, so we should be guaranteed not to be racing with > @@ -267,9 +267,9 @@ static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) > > static void sas_eh_defer_cmd(struct scsi_cmnd *cmd) > { > - struct sas_task *task = TO_SAS_TASK(cmd); > - struct domain_device *dev = task->dev; > + struct domain_device *dev = cmd_to_domain_dev(cmd); > struct sas_ha_struct *ha = dev->port->ha; > + struct sas_task *task = TO_SAS_TASK(cmd); > > if (!dev_is_sata(dev)) { > sas_eh_finish_cmd(cmd); > @@ -530,8 +530,9 @@ static int sas_eh_handle_sas_errors(struct Scsi_Host > *shost, > struct sas_internal *i = to_sas_internal(shost->transportt); > unsigned long flags; > struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); > + LIST_HEAD(done); > > -Again: > + /* clean out any commands that won the completion vs eh race */ > list_for_each_entry_safe(cmd, n, work_q, eh_entry) { > struct domain_device *dev = cmd_to_domain_dev(cmd); > struct sas_task *task; > @@ -545,7 +546,12 @@ Again: > spin_unlock_irqrestore(&dev->done_lock, flags); > > if (!task) > - continue; > + list_move_tail(&cmd->eh_entry, &done); > + } > + > + Again: > + 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); > > @@ -649,15 +655,16 @@ Again: > goto clear_q; > } > } > + out: > + list_splice_tail(&done, work_q); > list_splice_tail_init(&ha->eh_ata_q, work_q); > return list_empty(work_q); > -clear_q: > + > + clear_q: > SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__); > list_for_each_entry_safe(cmd, n, work_q, eh_entry) > sas_eh_finish_cmd(cmd); > - > - list_splice_tail_init(&ha->eh_ata_q, work_q); > - return list_empty(work_q); > + goto out; > } > > void sas_scsi_recover_host(struct Scsi_Host *shost) > diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h > index feb61a8..55bab86 100644 > --- a/include/scsi/libsas.h > +++ b/include/scsi/libsas.h > @@ -174,7 +174,11 @@ struct sata_device { > struct ata_taskfile tf; > }; > > -/* ---------- Domain device ---------- */ > +enum { > + SAS_DEV_GONE, > + SAS_DEV_DESTROY, > +}; > + > struct domain_device { > spinlock_t done_lock; > enum sas_dev_type dev_type; > @@ -191,7 +195,7 @@ struct domain_device { > struct sas_phy *phy; > > struct list_head dev_list_node; > - struct list_head disco_list_node; > + struct list_head disco_list_node; /* awaiting probe or destruct */ > > enum sas_protocol iproto; > enum sas_protocol tproto; > @@ -209,7 +213,7 @@ struct domain_device { > }; > > void *lldd_dev; > - int gone; > + unsigned long state; > struct kref kref; > }; > > > The following changes since commit 5c41dc3a79150e93e5d050871a10b761be8281a1: > > [SCSI] lpfc 8.3.28: Update driver version to 8.3.28 (2011-12-15 10:57:45 > +0400) > > are available in the git repository at: > git://git.kernel.org/pub/scm/linux/kernel/git/djbw/isci.git > libsas-eh-reworks-v4 > > Dan Williams (36): > libsas: remove unused ata_task_resp fields > libsas: kill sas_slave_destroy > libsas: fix domain_device leak > libsas: fix leak of dev->sata_dev.identify_[packet_]device > libsas: replace event locks with atomic bitops > libsas: convert ha->state to flags > libsas: introduce sas_drain_work() > libsas: remove ata_port.lock management duties from lldds > libsas: convert dev->gone to flags > libsas: prevent domain rediscovery competing with ata error handling > libsas: use ->set_dmamode to notify lldds of NCQ parameters > libsas: kill invocation of scsi_eh_finish_cmd from sas_ata_task_done > libsas: close error handling vs sas_ata_task_done() race > libsas: prevent double completion of scmds from eh > libsas: fix timeout vs completion race > libsas: let libata handle command timeouts > libsas: defer SAS_TASK_NEED_DEV_RESET commands to libata > libsas: use libata-eh-reset for sata rediscovery fis transmit failures > libsas: perform sas-transport resets in shost->workq context > libsas: execute transport link resets with libata-eh via host workqueue > libsas: sas_phy_enable via transport_sas_phy_reset > libsas: async ata-eh > libsas: poll for ata device readiness after reset > libsas: don't mark expanders as gone when a child device is removed > libsas: check for 'gone' expanders in smp_execute_task() > libsas: fix sas_find_local_phy(), take phy references > libsas: don't recover 'gone' devices in sas_ata_hard_reset() > isci: kill iphy->isci_port lookups > isci: kill isci_port->status > isci: fix interpretation of "hard" reset > isci: stop interpreting ->lldd_lu_reset() as an ata soft-reset > isci: ->lldd_ata_check_ready handler > isci: remove bus and reset handlers > isci: remove IDEV_EH hack to disable "discovery-time" ata resets > libsas: pre-clean commands that won the eh vs completion race > libsas: feed the scsi_block_when_processing_errors() meter > > Jeff Skirvin (2): > libsas: Remove redundant phy state notification calls. > libsas: add mutex for SMP task execution > > Documentation/scsi/libsas.txt | 15 - > drivers/ata/libata-eh.c | 1 + > drivers/ata/libata.h | 1 - > drivers/scsi/aic94xx/aic94xx.h | 2 + > drivers/scsi/aic94xx/aic94xx_dev.c | 38 ++- > drivers/scsi/aic94xx/aic94xx_init.c | 5 +- > drivers/scsi/aic94xx/aic94xx_tmf.c | 9 +- > drivers/scsi/isci/host.c | 8 +- > drivers/scsi/isci/host.h | 19 +- > drivers/scsi/isci/init.c | 13 +- > drivers/scsi/isci/phy.c | 18 +- > drivers/scsi/isci/phy.h | 1 - > drivers/scsi/isci/port.c | 217 ++++++------ > drivers/scsi/isci/port.h | 11 +- > drivers/scsi/isci/remote_device.c | 32 +-- > drivers/scsi/isci/remote_device.h | 7 +- > drivers/scsi/isci/request.c | 198 +---------- > drivers/scsi/isci/request.h | 9 +- > drivers/scsi/isci/task.c | 158 ++------- > drivers/scsi/isci/task.h | 40 -- > drivers/scsi/libsas/sas_ata.c | 692 > +++++++++++++++-------------------- > drivers/scsi/libsas/sas_discover.c | 152 +++++++-- > drivers/scsi/libsas/sas_event.c | 89 +++++- > drivers/scsi/libsas/sas_expander.c | 113 ++++-- > drivers/scsi/libsas/sas_init.c | 192 +++++++++- > drivers/scsi/libsas/sas_internal.h | 73 ++-- > drivers/scsi/libsas/sas_phy.c | 12 +- > drivers/scsi/libsas/sas_port.c | 26 +- > drivers/scsi/libsas/sas_scsi_host.c | 320 +++++++--------- > drivers/scsi/mvsas/mv_init.c | 1 - > drivers/scsi/mvsas/mv_sas.c | 11 +- > drivers/scsi/pm8001/pm8001_init.c | 1 - > drivers/scsi/pm8001/pm8001_sas.c | 29 +- > drivers/scsi/scsi_transport_sas.c | 59 +++- > include/linux/libata.h | 1 + > include/scsi/libsas.h | 67 ++-- > include/scsi/sas_ata.h | 26 +- > include/scsi/scsi_transport_sas.h | 12 +- > 38 files changed, 1321 insertions(+), 1357 deletions(-) > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
