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f41a0c441c
In the direct-attached case this routine returns the phy on which this device was first discovered. Which is broken if we want to support wide-targets, as this phy reference can become stale even though the port is still active. In the expander-attached case this routine tries to lookup the phy by scanning the attached sas addresses of the parent expander, and BUG_ONs if it can't find it. However since eh and the libsas workqueue run independently we can still be attempting device recovery via eh after libsas has recorded the device as detached. This is even easier to hit now that eh is blocked while device domain rediscovery takes place, and that libata is fed more timed out commands increasing the chances that it will try to recover the ata device. Arrange for dev->phy to always point to a last known good phy, it may be stale after the port is torn down, but it will catch up for wide port reconfigurations, and never be NULL. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
172 lines
5.5 KiB
C
172 lines
5.5 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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struct sas_phy_data {
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/* let reset be performed in sas_queue_work() context */
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struct sas_phy *phy;
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struct mutex event_lock;
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int hard_reset;
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int reset_result;
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struct work_struct reset_work;
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int enable;
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int enable_result;
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struct work_struct enable_work;
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};
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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_disable_revalidation(struct sas_ha_struct *ha);
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void sas_enable_revalidation(struct sas_ha_struct *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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void sas_queue_work(struct sas_ha_struct *ha, 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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void sas_device_set_phy(struct domain_device *dev, struct sas_port *port);
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struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
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struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
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int sas_get_phy_attached_sas_addr(struct domain_device *dev, int phy_id,
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u8 *attached_sas_addr);
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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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INIT_LIST_HEAD(&dev->disco_list_node);
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kref_init(&dev->kref);
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spin_lock_init(&dev->done_lock);
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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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