mirror of https://gitee.com/openkylin/linux.git
591 lines
15 KiB
C
591 lines
15 KiB
C
/*
|
|
* Serial Attached SCSI (SAS) Discover process
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/async.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_eh.h>
|
|
#include "sas_internal.h"
|
|
|
|
#include <scsi/scsi_transport.h>
|
|
#include <scsi/scsi_transport_sas.h>
|
|
#include <scsi/sas_ata.h>
|
|
#include "../scsi_sas_internal.h"
|
|
|
|
/* ---------- Basic task processing for discovery purposes ---------- */
|
|
|
|
void sas_init_dev(struct domain_device *dev)
|
|
{
|
|
switch (dev->dev_type) {
|
|
case SAS_END_DEVICE:
|
|
INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
|
|
break;
|
|
case SAS_EDGE_EXPANDER_DEVICE:
|
|
case SAS_FANOUT_EXPANDER_DEVICE:
|
|
INIT_LIST_HEAD(&dev->ex_dev.children);
|
|
mutex_init(&dev->ex_dev.cmd_mutex);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* ---------- Domain device discovery ---------- */
|
|
|
|
/**
|
|
* sas_get_port_device -- Discover devices which caused port creation
|
|
* @port: pointer to struct sas_port of interest
|
|
*
|
|
* Devices directly attached to a HA port, have no parent. This is
|
|
* how we know they are (domain) "root" devices. All other devices
|
|
* do, and should have their "parent" pointer set appropriately as
|
|
* soon as a child device is discovered.
|
|
*/
|
|
static int sas_get_port_device(struct asd_sas_port *port)
|
|
{
|
|
struct asd_sas_phy *phy;
|
|
struct sas_rphy *rphy;
|
|
struct domain_device *dev;
|
|
int rc = -ENODEV;
|
|
|
|
dev = sas_alloc_device();
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_irq(&port->phy_list_lock);
|
|
if (list_empty(&port->phy_list)) {
|
|
spin_unlock_irq(&port->phy_list_lock);
|
|
sas_put_device(dev);
|
|
return -ENODEV;
|
|
}
|
|
phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
|
|
spin_lock(&phy->frame_rcvd_lock);
|
|
memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
|
|
(size_t)phy->frame_rcvd_size));
|
|
spin_unlock(&phy->frame_rcvd_lock);
|
|
spin_unlock_irq(&port->phy_list_lock);
|
|
|
|
if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
|
|
struct dev_to_host_fis *fis =
|
|
(struct dev_to_host_fis *) dev->frame_rcvd;
|
|
if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
|
|
fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
|
|
&& (fis->device & ~0x10) == 0)
|
|
dev->dev_type = SAS_SATA_PM;
|
|
else
|
|
dev->dev_type = SAS_SATA_DEV;
|
|
dev->tproto = SAS_PROTOCOL_SATA;
|
|
} else {
|
|
struct sas_identify_frame *id =
|
|
(struct sas_identify_frame *) dev->frame_rcvd;
|
|
dev->dev_type = id->dev_type;
|
|
dev->iproto = id->initiator_bits;
|
|
dev->tproto = id->target_bits;
|
|
}
|
|
|
|
sas_init_dev(dev);
|
|
|
|
dev->port = port;
|
|
switch (dev->dev_type) {
|
|
case SAS_SATA_DEV:
|
|
rc = sas_ata_init(dev);
|
|
if (rc) {
|
|
rphy = NULL;
|
|
break;
|
|
}
|
|
/* fall through */
|
|
case SAS_END_DEVICE:
|
|
rphy = sas_end_device_alloc(port->port);
|
|
break;
|
|
case SAS_EDGE_EXPANDER_DEVICE:
|
|
rphy = sas_expander_alloc(port->port,
|
|
SAS_EDGE_EXPANDER_DEVICE);
|
|
break;
|
|
case SAS_FANOUT_EXPANDER_DEVICE:
|
|
rphy = sas_expander_alloc(port->port,
|
|
SAS_FANOUT_EXPANDER_DEVICE);
|
|
break;
|
|
default:
|
|
printk("ERROR: Unidentified device type %d\n", dev->dev_type);
|
|
rphy = NULL;
|
|
break;
|
|
}
|
|
|
|
if (!rphy) {
|
|
sas_put_device(dev);
|
|
return rc;
|
|
}
|
|
|
|
rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
|
|
memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
|
|
sas_fill_in_rphy(dev, rphy);
|
|
sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
|
|
port->port_dev = dev;
|
|
dev->linkrate = port->linkrate;
|
|
dev->min_linkrate = port->linkrate;
|
|
dev->max_linkrate = port->linkrate;
|
|
dev->pathways = port->num_phys;
|
|
memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
|
|
memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
|
|
memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
|
|
port->disc.max_level = 0;
|
|
sas_device_set_phy(dev, port->port);
|
|
|
|
dev->rphy = rphy;
|
|
get_device(&dev->rphy->dev);
|
|
|
|
if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE)
|
|
list_add_tail(&dev->disco_list_node, &port->disco_list);
|
|
else {
|
|
spin_lock_irq(&port->dev_list_lock);
|
|
list_add_tail(&dev->dev_list_node, &port->dev_list);
|
|
spin_unlock_irq(&port->dev_list_lock);
|
|
}
|
|
|
|
spin_lock_irq(&port->phy_list_lock);
|
|
list_for_each_entry(phy, &port->phy_list, port_phy_el)
|
|
sas_phy_set_target(phy, dev);
|
|
spin_unlock_irq(&port->phy_list_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ---------- Discover and Revalidate ---------- */
|
|
|
|
int sas_notify_lldd_dev_found(struct domain_device *dev)
|
|
{
|
|
int res = 0;
|
|
struct sas_ha_struct *sas_ha = dev->port->ha;
|
|
struct Scsi_Host *shost = sas_ha->core.shost;
|
|
struct sas_internal *i = to_sas_internal(shost->transportt);
|
|
|
|
if (!i->dft->lldd_dev_found)
|
|
return 0;
|
|
|
|
res = i->dft->lldd_dev_found(dev);
|
|
if (res) {
|
|
printk("sas: driver on pcidev %s cannot handle "
|
|
"device %llx, error:%d\n",
|
|
dev_name(sas_ha->dev),
|
|
SAS_ADDR(dev->sas_addr), res);
|
|
}
|
|
set_bit(SAS_DEV_FOUND, &dev->state);
|
|
kref_get(&dev->kref);
|
|
return res;
|
|
}
|
|
|
|
|
|
void sas_notify_lldd_dev_gone(struct domain_device *dev)
|
|
{
|
|
struct sas_ha_struct *sas_ha = dev->port->ha;
|
|
struct Scsi_Host *shost = sas_ha->core.shost;
|
|
struct sas_internal *i = to_sas_internal(shost->transportt);
|
|
|
|
if (!i->dft->lldd_dev_gone)
|
|
return;
|
|
|
|
if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) {
|
|
i->dft->lldd_dev_gone(dev);
|
|
sas_put_device(dev);
|
|
}
|
|
}
|
|
|
|
static void sas_probe_devices(struct work_struct *work)
|
|
{
|
|
struct domain_device *dev, *n;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
|
|
clear_bit(DISCE_PROBE, &port->disc.pending);
|
|
|
|
/* devices must be domain members before link recovery and probe */
|
|
list_for_each_entry(dev, &port->disco_list, disco_list_node) {
|
|
spin_lock_irq(&port->dev_list_lock);
|
|
list_add_tail(&dev->dev_list_node, &port->dev_list);
|
|
spin_unlock_irq(&port->dev_list_lock);
|
|
}
|
|
|
|
sas_probe_sata(port);
|
|
|
|
list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
|
|
int err;
|
|
|
|
err = sas_rphy_add(dev->rphy);
|
|
if (err)
|
|
sas_fail_probe(dev, __func__, err);
|
|
else
|
|
list_del_init(&dev->disco_list_node);
|
|
}
|
|
}
|
|
|
|
static void sas_suspend_devices(struct work_struct *work)
|
|
{
|
|
struct asd_sas_phy *phy;
|
|
struct domain_device *dev;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
struct Scsi_Host *shost = port->ha->core.shost;
|
|
struct sas_internal *si = to_sas_internal(shost->transportt);
|
|
|
|
clear_bit(DISCE_SUSPEND, &port->disc.pending);
|
|
|
|
sas_suspend_sata(port);
|
|
|
|
/* lldd is free to forget the domain_device across the
|
|
* suspension, we force the issue here to keep the reference
|
|
* counts aligned
|
|
*/
|
|
list_for_each_entry(dev, &port->dev_list, dev_list_node)
|
|
sas_notify_lldd_dev_gone(dev);
|
|
|
|
/* we are suspending, so we know events are disabled and
|
|
* phy_list is not being mutated
|
|
*/
|
|
list_for_each_entry(phy, &port->phy_list, port_phy_el) {
|
|
if (si->dft->lldd_port_formed)
|
|
si->dft->lldd_port_deformed(phy);
|
|
phy->suspended = 1;
|
|
port->suspended = 1;
|
|
}
|
|
}
|
|
|
|
static void sas_resume_devices(struct work_struct *work)
|
|
{
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
|
|
clear_bit(DISCE_RESUME, &port->disc.pending);
|
|
|
|
sas_resume_sata(port);
|
|
}
|
|
|
|
/**
|
|
* sas_discover_end_dev -- discover an end device (SSP, etc)
|
|
* @end: pointer to domain device of interest
|
|
*
|
|
* See comment in sas_discover_sata().
|
|
*/
|
|
int sas_discover_end_dev(struct domain_device *dev)
|
|
{
|
|
int res;
|
|
|
|
res = sas_notify_lldd_dev_found(dev);
|
|
if (res)
|
|
return res;
|
|
sas_discover_event(dev->port, DISCE_PROBE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ---------- Device registration and unregistration ---------- */
|
|
|
|
void sas_free_device(struct kref *kref)
|
|
{
|
|
struct domain_device *dev = container_of(kref, typeof(*dev), kref);
|
|
|
|
put_device(&dev->rphy->dev);
|
|
dev->rphy = NULL;
|
|
|
|
if (dev->parent)
|
|
sas_put_device(dev->parent);
|
|
|
|
sas_port_put_phy(dev->phy);
|
|
dev->phy = NULL;
|
|
|
|
/* remove the phys and ports, everything else should be gone */
|
|
if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
|
|
kfree(dev->ex_dev.ex_phy);
|
|
|
|
if (dev_is_sata(dev) && dev->sata_dev.ap) {
|
|
ata_sas_port_destroy(dev->sata_dev.ap);
|
|
dev->sata_dev.ap = NULL;
|
|
}
|
|
|
|
kfree(dev);
|
|
}
|
|
|
|
static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
|
|
{
|
|
struct sas_ha_struct *ha = port->ha;
|
|
|
|
sas_notify_lldd_dev_gone(dev);
|
|
if (!dev->parent)
|
|
dev->port->port_dev = NULL;
|
|
else
|
|
list_del_init(&dev->siblings);
|
|
|
|
spin_lock_irq(&port->dev_list_lock);
|
|
list_del_init(&dev->dev_list_node);
|
|
if (dev_is_sata(dev))
|
|
sas_ata_end_eh(dev->sata_dev.ap);
|
|
spin_unlock_irq(&port->dev_list_lock);
|
|
|
|
spin_lock_irq(&ha->lock);
|
|
if (dev->dev_type == SAS_END_DEVICE &&
|
|
!list_empty(&dev->ssp_dev.eh_list_node)) {
|
|
list_del_init(&dev->ssp_dev.eh_list_node);
|
|
ha->eh_active--;
|
|
}
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
sas_put_device(dev);
|
|
}
|
|
|
|
static void sas_destruct_devices(struct work_struct *work)
|
|
{
|
|
struct domain_device *dev, *n;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
|
|
clear_bit(DISCE_DESTRUCT, &port->disc.pending);
|
|
|
|
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);
|
|
sas_unregister_common_dev(port, dev);
|
|
}
|
|
}
|
|
|
|
void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
|
|
{
|
|
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);
|
|
sas_unregister_common_dev(port, dev);
|
|
return;
|
|
}
|
|
|
|
if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
|
|
sas_rphy_unlink(dev->rphy);
|
|
list_move_tail(&dev->disco_list_node, &port->destroy_list);
|
|
sas_discover_event(dev->port, DISCE_DESTRUCT);
|
|
}
|
|
}
|
|
|
|
void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
|
|
{
|
|
struct domain_device *dev, *n;
|
|
|
|
list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
|
|
if (gone)
|
|
set_bit(SAS_DEV_GONE, &dev->state);
|
|
sas_unregister_dev(port, dev);
|
|
}
|
|
|
|
list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
|
|
sas_unregister_dev(port, dev);
|
|
|
|
port->port->rphy = NULL;
|
|
|
|
}
|
|
|
|
void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
|
|
{
|
|
struct sas_ha_struct *ha;
|
|
struct sas_phy *new_phy;
|
|
|
|
if (!dev)
|
|
return;
|
|
|
|
ha = dev->port->ha;
|
|
new_phy = sas_port_get_phy(port);
|
|
|
|
/* pin and record last seen phy */
|
|
spin_lock_irq(&ha->phy_port_lock);
|
|
if (new_phy) {
|
|
sas_port_put_phy(dev->phy);
|
|
dev->phy = new_phy;
|
|
}
|
|
spin_unlock_irq(&ha->phy_port_lock);
|
|
}
|
|
|
|
/* ---------- Discovery and Revalidation ---------- */
|
|
|
|
/**
|
|
* sas_discover_domain -- discover the domain
|
|
* @port: port to the domain of interest
|
|
*
|
|
* NOTE: this process _must_ quit (return) as soon as any connection
|
|
* errors are encountered. Connection recovery is done elsewhere.
|
|
* Discover process only interrogates devices in order to discover the
|
|
* domain.
|
|
*/
|
|
static void sas_discover_domain(struct work_struct *work)
|
|
{
|
|
struct domain_device *dev;
|
|
int error = 0;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
|
|
clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
|
|
|
|
if (port->port_dev)
|
|
return;
|
|
|
|
error = sas_get_port_device(port);
|
|
if (error)
|
|
return;
|
|
dev = port->port_dev;
|
|
|
|
SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
|
|
task_pid_nr(current));
|
|
|
|
switch (dev->dev_type) {
|
|
case SAS_END_DEVICE:
|
|
error = sas_discover_end_dev(dev);
|
|
break;
|
|
case SAS_EDGE_EXPANDER_DEVICE:
|
|
case SAS_FANOUT_EXPANDER_DEVICE:
|
|
error = sas_discover_root_expander(dev);
|
|
break;
|
|
case SAS_SATA_DEV:
|
|
case SAS_SATA_PM:
|
|
#ifdef CONFIG_SCSI_SAS_ATA
|
|
error = sas_discover_sata(dev);
|
|
break;
|
|
#else
|
|
SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
|
|
/* Fall through */
|
|
#endif
|
|
default:
|
|
error = -ENXIO;
|
|
SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
|
|
break;
|
|
}
|
|
|
|
if (error) {
|
|
sas_rphy_free(dev->rphy);
|
|
list_del_init(&dev->disco_list_node);
|
|
spin_lock_irq(&port->dev_list_lock);
|
|
list_del_init(&dev->dev_list_node);
|
|
spin_unlock_irq(&port->dev_list_lock);
|
|
|
|
sas_put_device(dev);
|
|
port->port_dev = NULL;
|
|
}
|
|
|
|
SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
|
|
task_pid_nr(current), error);
|
|
}
|
|
|
|
static void sas_revalidate_domain(struct work_struct *work)
|
|
{
|
|
int res = 0;
|
|
struct sas_discovery_event *ev = to_sas_discovery_event(work);
|
|
struct asd_sas_port *port = ev->port;
|
|
struct sas_ha_struct *ha = port->ha;
|
|
|
|
/* prevent revalidation from finding sata links in recovery */
|
|
mutex_lock(&ha->disco_mutex);
|
|
if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
|
|
SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
|
|
port->id, task_pid_nr(current));
|
|
goto out;
|
|
}
|
|
|
|
clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
|
|
|
|
SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
|
|
task_pid_nr(current));
|
|
|
|
if (port->port_dev)
|
|
res = sas_ex_revalidate_domain(port->port_dev);
|
|
|
|
SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
|
|
port->id, task_pid_nr(current), res);
|
|
out:
|
|
mutex_unlock(&ha->disco_mutex);
|
|
}
|
|
|
|
/* ---------- Events ---------- */
|
|
|
|
static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
|
|
{
|
|
/* chained work is not subject to SA_HA_DRAINING or
|
|
* SAS_HA_REGISTERED, because it is either submitted in the
|
|
* workqueue, or known to be submitted from a context that is
|
|
* not racing against draining
|
|
*/
|
|
scsi_queue_work(ha->core.shost, &sw->work);
|
|
}
|
|
|
|
static void sas_chain_event(int event, unsigned long *pending,
|
|
struct sas_work *sw,
|
|
struct sas_ha_struct *ha)
|
|
{
|
|
if (!test_and_set_bit(event, pending)) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ha->lock, flags);
|
|
sas_chain_work(ha, sw);
|
|
spin_unlock_irqrestore(&ha->lock, flags);
|
|
}
|
|
}
|
|
|
|
int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
|
|
{
|
|
struct sas_discovery *disc;
|
|
|
|
if (!port)
|
|
return 0;
|
|
disc = &port->disc;
|
|
|
|
BUG_ON(ev >= DISC_NUM_EVENTS);
|
|
|
|
sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sas_init_disc -- initialize the discovery struct in the port
|
|
* @port: pointer to struct port
|
|
*
|
|
* Called when the ports are being initialized.
|
|
*/
|
|
void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
|
|
{
|
|
int i;
|
|
|
|
static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
|
|
[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
|
|
[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
|
|
[DISCE_PROBE] = sas_probe_devices,
|
|
[DISCE_SUSPEND] = sas_suspend_devices,
|
|
[DISCE_RESUME] = sas_resume_devices,
|
|
[DISCE_DESTRUCT] = sas_destruct_devices,
|
|
};
|
|
|
|
disc->pending = 0;
|
|
for (i = 0; i < DISC_NUM_EVENTS; i++) {
|
|
INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
|
|
disc->disc_work[i].port = port;
|
|
}
|
|
}
|