From 0b3e09da1350397f3f8b6fd839ab455b0b587451 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 20 Dec 2011 01:03:48 -0800 Subject: [PATCH] [SCSI] libsas: perform sas-transport resets in shost->workq context Extend the sas transport class to allow transport users to attach extra data to a sas_phy (->hostdata). Use this area in libsas to move resets to workq context in preparation for scheduling ata device resets through libata-eh. Signed-off-by: Dan Williams Signed-off-by: James Bottomley --- drivers/scsi/libsas/sas_event.c | 2 +- drivers/scsi/libsas/sas_init.c | 59 +++++++++++++++++++++++++++++- drivers/scsi/libsas/sas_internal.h | 10 +++++ drivers/scsi/scsi_transport_sas.c | 18 ++++++++- include/scsi/scsi_transport_sas.h | 5 ++- 5 files changed, 90 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c index 933d757499b..dbfaceeea0f 100644 --- a/drivers/scsi/libsas/sas_event.c +++ b/drivers/scsi/libsas/sas_event.c @@ -27,7 +27,7 @@ #include "sas_internal.h" #include "sas_dump.h" -static void sas_queue_work(struct sas_ha_struct *ha, struct work_struct *work) +void sas_queue_work(struct sas_ha_struct *ha, struct work_struct *work) { if (!test_bit(SAS_HA_REGISTERED, &ha->state)) return; diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c index e17fe35af30..cb65adf4ab1 100644 --- a/drivers/scsi/libsas/sas_init.c +++ b/drivers/scsi/libsas/sas_init.c @@ -290,9 +290,66 @@ int sas_set_phy_speed(struct sas_phy *phy, return ret; } +static void sas_phy_release(struct sas_phy *phy) +{ + kfree(phy->hostdata); + phy->hostdata = NULL; +} + +static void phy_reset_work(struct work_struct *work) +{ + struct sas_phy_data *d = container_of(work, typeof(*d), reset_work); + + d->reset_result = sas_phy_reset(d->phy, d->hard_reset); +} + +static int sas_phy_setup(struct sas_phy *phy) +{ + struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL); + + if (!d) + return -ENOMEM; + + mutex_init(&d->event_lock); + INIT_WORK(&d->reset_work, phy_reset_work); + d->phy = phy; + phy->hostdata = d; + + return 0; +} + +static int queue_phy_reset(struct sas_phy *phy, int hard_reset) +{ + struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); + struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); + struct sas_phy_data *d = phy->hostdata; + int rc; + + if (!d) + return -ENOMEM; + + /* libsas workqueue coordinates ata-eh reset with discovery */ + mutex_lock(&d->event_lock); + d->reset_result = 0; + d->hard_reset = hard_reset; + + spin_lock_irq(&ha->state_lock); + sas_queue_work(ha, &d->reset_work); + spin_unlock_irq(&ha->state_lock); + + rc = sas_drain_work(ha); + if (rc == 0) + rc = d->reset_result; + mutex_unlock(&d->event_lock); + + return rc; +} + static struct sas_function_template sft = { .phy_enable = sas_phy_enable, - .phy_reset = sas_phy_reset, + .phy_reset = queue_phy_reset, + .phy_setup = sas_phy_setup, + .phy_release = sas_phy_release, .set_phy_speed = sas_set_phy_speed, .get_linkerrors = sas_get_linkerrors, .smp_handler = sas_smp_handler, diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h index 662ffcba99d..9ba65e0c6f9 100644 --- a/drivers/scsi/libsas/sas_internal.h +++ b/drivers/scsi/libsas/sas_internal.h @@ -38,6 +38,15 @@ #define TO_SAS_TASK(_scsi_cmd) ((void *)(_scsi_cmd)->host_scribble) #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0) +struct sas_phy_data { + /* let reset be performed in sas_queue_work() context */ + struct sas_phy *phy; + struct mutex event_lock; + int hard_reset; + int reset_result; + struct work_struct reset_work; +}; + void sas_scsi_recover_host(struct Scsi_Host *shost); int sas_show_class(enum sas_class class, char *buf); @@ -66,6 +75,7 @@ void sas_porte_broadcast_rcvd(struct work_struct *work); void sas_porte_link_reset_err(struct work_struct *work); void sas_porte_timer_event(struct work_struct *work); void sas_porte_hard_reset(struct work_struct *work); +void sas_queue_work(struct sas_ha_struct *ha, struct work_struct *work); int sas_notify_lldd_dev_found(struct domain_device *); void sas_notify_lldd_dev_gone(struct domain_device *); diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c index 9421bae8af1..ab3bd0b5ffd 100644 --- a/drivers/scsi/scsi_transport_sas.c +++ b/drivers/scsi/scsi_transport_sas.c @@ -652,9 +652,21 @@ sas_phy_linkerror_attr(running_disparity_error_count); sas_phy_linkerror_attr(loss_of_dword_sync_count); sas_phy_linkerror_attr(phy_reset_problem_count); +static int sas_phy_setup(struct transport_container *tc, struct device *dev, + struct device *cdev) +{ + struct sas_phy *phy = dev_to_phy(dev); + struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); + struct sas_internal *i = to_sas_internal(shost->transportt); + + if (i->f->phy_setup) + i->f->phy_setup(phy); + + return 0; +} static DECLARE_TRANSPORT_CLASS(sas_phy_class, - "sas_phy", NULL, NULL, NULL); + "sas_phy", sas_phy_setup, NULL, NULL); static int sas_phy_match(struct attribute_container *cont, struct device *dev) { @@ -678,7 +690,11 @@ static int sas_phy_match(struct attribute_container *cont, struct device *dev) static void sas_phy_release(struct device *dev) { struct sas_phy *phy = dev_to_phy(dev); + struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); + struct sas_internal *i = to_sas_internal(shost->transportt); + if (i->f->phy_release) + i->f->phy_release(phy); put_device(dev->parent); kfree(phy); } diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h index 6d14daac758..42817facaed 100644 --- a/include/scsi/scsi_transport_sas.h +++ b/include/scsi/scsi_transport_sas.h @@ -75,7 +75,8 @@ struct sas_phy { /* for the list of phys belonging to a port */ struct list_head port_siblings; - struct work_struct reset_work; + /* available to the lldd */ + void *hostdata; }; #define dev_to_phy(d) \ @@ -169,6 +170,8 @@ struct sas_function_template { int (*get_bay_identifier)(struct sas_rphy *); int (*phy_reset)(struct sas_phy *, int); int (*phy_enable)(struct sas_phy *, int); + int (*phy_setup)(struct sas_phy *); + void (*phy_release)(struct sas_phy *); int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *); int (*smp_handler)(struct Scsi_Host *, struct sas_rphy *, struct request *); }; -- 2.39.5