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linux/drivers/scsi/libsas/sas_internal.h
Dan Williams 303694eeee [SCSI] libsas: suspend / resume support 
libsas power management routines to suspend and recover the sas domain
based on a model where the lldd is allowed and expected to be
"forgetful".

sas_suspend_ha - disable event processing allowing the lldd to take down
                 links without concern for causing hotplug events.
                 Regardless of whether the lldd actually posts link down
                 messages libsas notifies the lldd that all
                 domain_devices are gone.

sas_prep_resume_ha - on the way back up before the lldd starts link
                     training clean out any spurious events that were
                     generated on the way down, and re-enable event
                     processing

sas_resume_ha - after the lldd has started and decided that all phys
		have posted link-up events this routine is called to let
		libsas start it's own timeout of any phys that did not
		resume.  After the timeout an lldd can cancel the
                phy teardown by posting a link-up event.

Storage for ex_change_count (u16) and phy_change_count (u8) are changed
to int so they can be set to -1 to indicate 'invalidated'.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jacek Danecki <jacek.danecki@intel.com>
Tested-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2012-08-24 13:10:23 +04:00

203 lines
6.4 KiB
C
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/*
* Serial Attached SCSI (SAS) class internal header file
*
* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
*
* This file is licensed under GPLv2.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#ifndef _SAS_INTERNAL_H_
#define _SAS_INTERNAL_H_
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_sas.h>
#include <scsi/libsas.h>
#include <scsi/sas_ata.h>
#define sas_printk(fmt, ...) printk(KERN_NOTICE "sas: " fmt, ## __VA_ARGS__)
#define SAS_DPRINTK(fmt, ...) printk(KERN_DEBUG "sas: " fmt, ## __VA_ARGS__)
#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 sas_work reset_work;
int enable;
int enable_result;
struct sas_work enable_work;
};
void sas_scsi_recover_host(struct Scsi_Host *shost);
int sas_show_class(enum sas_class class, char *buf);
int sas_show_proto(enum sas_protocol proto, char *buf);
int sas_show_linkrate(enum sas_linkrate linkrate, char *buf);
int sas_show_oob_mode(enum sas_oob_mode oob_mode, char *buf);
int sas_register_phys(struct sas_ha_struct *sas_ha);
void sas_unregister_phys(struct sas_ha_struct *sas_ha);
int sas_register_ports(struct sas_ha_struct *sas_ha);
void sas_unregister_ports(struct sas_ha_struct *sas_ha);
enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *);
int sas_init_queue(struct sas_ha_struct *sas_ha);
int sas_init_events(struct sas_ha_struct *sas_ha);
void sas_shutdown_queue(struct sas_ha_struct *sas_ha);
void sas_disable_revalidation(struct sas_ha_struct *ha);
void sas_enable_revalidation(struct sas_ha_struct *ha);
void __sas_drain_work(struct sas_ha_struct *ha);
void sas_deform_port(struct asd_sas_phy *phy, int gone);
void sas_porte_bytes_dmaed(struct work_struct *work);
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 sas_work *sw);
int sas_notify_lldd_dev_found(struct domain_device *);
void sas_notify_lldd_dev_gone(struct domain_device *);
int sas_smp_phy_control(struct domain_device *dev, int phy_id,
enum phy_func phy_func, struct sas_phy_linkrates *);
int sas_smp_get_phy_events(struct sas_phy *phy);
void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event);
void sas_device_set_phy(struct domain_device *dev, struct sas_port *port);
struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
int sas_ex_phy_discover(struct domain_device *dev, int single);
int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
struct smp_resp *rps_resp);
int sas_try_ata_reset(struct asd_sas_phy *phy);
void sas_hae_reset(struct work_struct *work);
void sas_free_device(struct kref *kref);
#ifdef CONFIG_SCSI_SAS_HOST_SMP
extern int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
struct request *rsp);
#else
static inline int sas_smp_host_handler(struct Scsi_Host *shost,
struct request *req,
struct request *rsp)
{
shost_printk(KERN_ERR, shost,
"Cannot send SMP to a sas host (not enabled in CONFIG)\n");
return -EINVAL;
}
#endif
static inline void sas_fail_probe(struct domain_device *dev, const char *func, int err)
{
SAS_DPRINTK("%s: for %s device %16llx returned %d\n",
func, dev->parent ? "exp-attached" :
"direct-attached",
SAS_ADDR(dev->sas_addr), err);
sas_unregister_dev(dev->port, dev);
}
static inline void sas_fill_in_rphy(struct domain_device *dev,
struct sas_rphy *rphy)
{
rphy->identify.sas_address = SAS_ADDR(dev->sas_addr);
rphy->identify.initiator_port_protocols = dev->iproto;
rphy->identify.target_port_protocols = dev->tproto;
switch (dev->dev_type) {
case SATA_DEV:
/* FIXME: need sata device type */
case SAS_END_DEV:
case SATA_PENDING:
rphy->identify.device_type = SAS_END_DEVICE;
break;
case EDGE_DEV:
rphy->identify.device_type = SAS_EDGE_EXPANDER_DEVICE;
break;
case FANOUT_DEV:
rphy->identify.device_type = SAS_FANOUT_EXPANDER_DEVICE;
break;
default:
rphy->identify.device_type = SAS_PHY_UNUSED;
break;
}
}
static inline void sas_phy_set_target(struct asd_sas_phy *p, struct domain_device *dev)
{
struct sas_phy *phy = p->phy;
if (dev) {
if (dev_is_sata(dev))
phy->identify.device_type = SAS_END_DEVICE;
else
phy->identify.device_type = dev->dev_type;
phy->identify.target_port_protocols = dev->tproto;
} else {
phy->identify.device_type = SAS_PHY_UNUSED;
phy->identify.target_port_protocols = 0;
}
}
static inline void sas_add_parent_port(struct domain_device *dev, int phy_id)
{
struct expander_device *ex = &dev->ex_dev;
struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
if (!ex->parent_port) {
ex->parent_port = sas_port_alloc(&dev->rphy->dev, phy_id);
/* FIXME: error handling */
BUG_ON(!ex->parent_port);
BUG_ON(sas_port_add(ex->parent_port));
sas_port_mark_backlink(ex->parent_port);
}
sas_port_add_phy(ex->parent_port, ex_phy->phy);
}
static inline struct domain_device *sas_alloc_device(void)
{
struct domain_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev) {
INIT_LIST_HEAD(&dev->siblings);
INIT_LIST_HEAD(&dev->dev_list_node);
INIT_LIST_HEAD(&dev->disco_list_node);
kref_init(&dev->kref);
spin_lock_init(&dev->done_lock);
}
return dev;
}
static inline void sas_put_device(struct domain_device *dev)
{
kref_put(&dev->kref, sas_free_device);
}
#endif /* _SAS_INTERNAL_H_ */
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