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b1124cd3ec
When an lldd invokes ->notify_port_event() it can trigger a chain of libsas events to: 1/ form the port and find the direct attached device 2/ if the attached device is an expander perform domain discovery A call to flush_workqueue() will only flush the initial port formation work. Currently libsas users need to call scsi_flush_work() up to the max depth of chain (which will grow from 2 to 3 when ata discovery is moved to its own discovery event). Instead of open coding multiple calls switch to use drain_workqueue() to flush sas work. drain_workqueue() does not handle new work submitted during the drain so libsas needs a bit of infrastructure to hold off unchained work submissions while a drain is in flight. A lldd ->notify() event is considered 'unchained' while a sas_discover_event() is 'chained'. As Tejun notes: "For now, I think it would be best to add private wrapper in libsas to support deferring unchained work items while draining." Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
152 lines
4.7 KiB
C
152 lines
4.7 KiB
C
/*
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* Serial Attached SCSI (SAS) class internal header file
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*
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
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* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
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*
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* This file is licensed under GPLv2.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*/
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#ifndef _SAS_INTERNAL_H_
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#define _SAS_INTERNAL_H_
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport_sas.h>
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#include <scsi/libsas.h>
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#define sas_printk(fmt, ...) printk(KERN_NOTICE "sas: " fmt, ## __VA_ARGS__)
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#define SAS_DPRINTK(fmt, ...) printk(KERN_DEBUG "sas: " fmt, ## __VA_ARGS__)
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#define TO_SAS_TASK(_scsi_cmd) ((void *)(_scsi_cmd)->host_scribble)
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#define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
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void sas_scsi_recover_host(struct Scsi_Host *shost);
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int sas_show_class(enum sas_class class, char *buf);
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int sas_show_proto(enum sas_protocol proto, char *buf);
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int sas_show_linkrate(enum sas_linkrate linkrate, char *buf);
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int sas_show_oob_mode(enum sas_oob_mode oob_mode, char *buf);
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int sas_register_phys(struct sas_ha_struct *sas_ha);
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void sas_unregister_phys(struct sas_ha_struct *sas_ha);
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int sas_register_ports(struct sas_ha_struct *sas_ha);
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void sas_unregister_ports(struct sas_ha_struct *sas_ha);
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enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *);
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int sas_init_queue(struct sas_ha_struct *sas_ha);
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int sas_init_events(struct sas_ha_struct *sas_ha);
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void sas_shutdown_queue(struct sas_ha_struct *sas_ha);
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void sas_deform_port(struct asd_sas_phy *phy, int gone);
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void sas_porte_bytes_dmaed(struct work_struct *work);
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void sas_porte_broadcast_rcvd(struct work_struct *work);
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void sas_porte_link_reset_err(struct work_struct *work);
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void sas_porte_timer_event(struct work_struct *work);
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void sas_porte_hard_reset(struct work_struct *work);
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int sas_notify_lldd_dev_found(struct domain_device *);
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void sas_notify_lldd_dev_gone(struct domain_device *);
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int sas_smp_phy_control(struct domain_device *dev, int phy_id,
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enum phy_func phy_func, struct sas_phy_linkrates *);
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int sas_smp_get_phy_events(struct sas_phy *phy);
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struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
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void sas_hae_reset(struct work_struct *work);
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void sas_free_device(struct kref *kref);
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#ifdef CONFIG_SCSI_SAS_HOST_SMP
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extern int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
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struct request *rsp);
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#else
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static inline int sas_smp_host_handler(struct Scsi_Host *shost,
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struct request *req,
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struct request *rsp)
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{
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shost_printk(KERN_ERR, shost,
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"Cannot send SMP to a sas host (not enabled in CONFIG)\n");
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return -EINVAL;
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}
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#endif
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static inline void sas_fill_in_rphy(struct domain_device *dev,
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struct sas_rphy *rphy)
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{
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rphy->identify.sas_address = SAS_ADDR(dev->sas_addr);
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rphy->identify.initiator_port_protocols = dev->iproto;
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rphy->identify.target_port_protocols = dev->tproto;
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switch (dev->dev_type) {
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case SATA_DEV:
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/* FIXME: need sata device type */
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case SAS_END_DEV:
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rphy->identify.device_type = SAS_END_DEVICE;
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break;
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case EDGE_DEV:
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rphy->identify.device_type = SAS_EDGE_EXPANDER_DEVICE;
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break;
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case FANOUT_DEV:
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rphy->identify.device_type = SAS_FANOUT_EXPANDER_DEVICE;
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break;
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default:
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rphy->identify.device_type = SAS_PHY_UNUSED;
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break;
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}
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}
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static inline void sas_add_parent_port(struct domain_device *dev, int phy_id)
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{
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struct expander_device *ex = &dev->ex_dev;
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struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
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if (!ex->parent_port) {
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ex->parent_port = sas_port_alloc(&dev->rphy->dev, phy_id);
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/* FIXME: error handling */
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BUG_ON(!ex->parent_port);
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BUG_ON(sas_port_add(ex->parent_port));
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sas_port_mark_backlink(ex->parent_port);
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}
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sas_port_add_phy(ex->parent_port, ex_phy->phy);
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}
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static inline struct domain_device *sas_alloc_device(void)
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{
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struct domain_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (dev) {
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INIT_LIST_HEAD(&dev->siblings);
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INIT_LIST_HEAD(&dev->dev_list_node);
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kref_init(&dev->kref);
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}
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return dev;
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}
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static inline void sas_put_device(struct domain_device *dev)
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{
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kref_put(&dev->kref, sas_free_device);
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}
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#endif /* _SAS_INTERNAL_H_ */
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