linux/drivers/scsi/libsas/sas_port.c
Dan Williams 90f1e10d08 [SCSI] libsas: fix/amend device gone notification in sas_deform_port()
Commit 56dd2c06 "libsas: Don't issue commands to devices that have been
hot-removed" edited Darrick's original patch to remove setting 'gone' in
the sas_deform_port() path because that prevented scsi sync cache
commands from being issued when the driver was unloaded.  However, this
allows true device gone notifications (as signaled port phy events) to
trigger sync cache commands to devices that are known to be unreachable.

Teach libsas which sas_deform_port() invocations are likely device gone
events.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <jbottomley@parallels.com>
2011-05-26 22:49:32 -05:00

315 lines
8.2 KiB
C

/*
* Serial Attached SCSI (SAS) Port class
*
* 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 "sas_internal.h"
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"
static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy)
{
struct sas_ha_struct *sas_ha = phy->ha;
if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports &&
memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0))
return false;
return true;
}
/**
* sas_form_port -- add this phy to a port
* @phy: the phy of interest
*
* This function adds this phy to an existing port, thus creating a wide
* port, or it creates a port and adds the phy to the port.
*/
static void sas_form_port(struct asd_sas_phy *phy)
{
int i;
struct sas_ha_struct *sas_ha = phy->ha;
struct asd_sas_port *port = phy->port;
struct sas_internal *si =
to_sas_internal(sas_ha->core.shost->transportt);
unsigned long flags;
if (port) {
if (!phy_is_wideport_member(port, phy))
sas_deform_port(phy, 0);
else {
SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
__func__, phy->id, phy->port->id,
phy->port->num_phys);
return;
}
}
/* see if the phy should be part of a wide port */
spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
for (i = 0; i < sas_ha->num_phys; i++) {
port = sas_ha->sas_port[i];
spin_lock(&port->phy_list_lock);
if (*(u64 *) port->sas_addr &&
phy_is_wideport_member(port, phy) && port->num_phys > 0) {
/* wide port */
SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
port->id);
break;
}
spin_unlock(&port->phy_list_lock);
}
/* The phy does not match any existing port, create a new one */
if (i == sas_ha->num_phys) {
for (i = 0; i < sas_ha->num_phys; i++) {
port = sas_ha->sas_port[i];
spin_lock(&port->phy_list_lock);
if (*(u64 *)port->sas_addr == 0
&& port->num_phys == 0) {
memcpy(port->sas_addr, phy->sas_addr,
SAS_ADDR_SIZE);
break;
}
spin_unlock(&port->phy_list_lock);
}
}
if (i >= sas_ha->num_phys) {
printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
__func__);
spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
return;
}
/* add the phy to the port */
list_add_tail(&phy->port_phy_el, &port->phy_list);
phy->port = port;
port->num_phys++;
port->phy_mask |= (1U << phy->id);
if (!port->phy)
port->phy = phy->phy;
if (*(u64 *)port->attached_sas_addr == 0) {
port->class = phy->class;
memcpy(port->attached_sas_addr, phy->attached_sas_addr,
SAS_ADDR_SIZE);
port->iproto = phy->iproto;
port->tproto = phy->tproto;
port->oob_mode = phy->oob_mode;
port->linkrate = phy->linkrate;
} else
port->linkrate = max(port->linkrate, phy->linkrate);
spin_unlock(&port->phy_list_lock);
spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
if (!port->port) {
port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
BUG_ON(!port->port);
sas_port_add(port->port);
}
sas_port_add_phy(port->port, phy->phy);
SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n",
dev_name(&phy->phy->dev), dev_name(&port->port->dev),
port->phy_mask,
SAS_ADDR(port->attached_sas_addr));
if (port->port_dev)
port->port_dev->pathways = port->num_phys;
/* Tell the LLDD about this port formation. */
if (si->dft->lldd_port_formed)
si->dft->lldd_port_formed(phy);
sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
}
/**
* sas_deform_port -- remove this phy from the port it belongs to
* @phy: the phy of interest
*
* This is called when the physical link to the other phy has been
* lost (on this phy), in Event thread context. We cannot delay here.
*/
void sas_deform_port(struct asd_sas_phy *phy, int gone)
{
struct sas_ha_struct *sas_ha = phy->ha;
struct asd_sas_port *port = phy->port;
struct sas_internal *si =
to_sas_internal(sas_ha->core.shost->transportt);
struct domain_device *dev;
unsigned long flags;
if (!port)
return; /* done by a phy event */
dev = port->port_dev;
if (dev)
dev->pathways--;
if (port->num_phys == 1) {
if (dev && gone)
dev->gone = 1;
sas_unregister_domain_devices(port);
sas_port_delete(port->port);
port->port = NULL;
} else
sas_port_delete_phy(port->port, phy->phy);
if (si->dft->lldd_port_deformed)
si->dft->lldd_port_deformed(phy);
spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
spin_lock(&port->phy_list_lock);
list_del_init(&phy->port_phy_el);
phy->port = NULL;
port->num_phys--;
port->phy_mask &= ~(1U << phy->id);
if (port->num_phys == 0) {
INIT_LIST_HEAD(&port->phy_list);
memset(port->sas_addr, 0, SAS_ADDR_SIZE);
memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
port->class = 0;
port->iproto = 0;
port->tproto = 0;
port->oob_mode = 0;
port->phy_mask = 0;
}
spin_unlock(&port->phy_list_lock);
spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
return;
}
/* ---------- SAS port events ---------- */
void sas_porte_bytes_dmaed(struct work_struct *work)
{
struct asd_sas_event *ev =
container_of(work, struct asd_sas_event, work);
struct asd_sas_phy *phy = ev->phy;
sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
&phy->port_events_pending);
sas_form_port(phy);
}
void sas_porte_broadcast_rcvd(struct work_struct *work)
{
struct asd_sas_event *ev =
container_of(work, struct asd_sas_event, work);
struct asd_sas_phy *phy = ev->phy;
unsigned long flags;
u32 prim;
sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
&phy->port_events_pending);
spin_lock_irqsave(&phy->sas_prim_lock, flags);
prim = phy->sas_prim;
spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
SAS_DPRINTK("broadcast received: %d\n", prim);
sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
}
void sas_porte_link_reset_err(struct work_struct *work)
{
struct asd_sas_event *ev =
container_of(work, struct asd_sas_event, work);
struct asd_sas_phy *phy = ev->phy;
sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
&phy->port_events_pending);
sas_deform_port(phy, 1);
}
void sas_porte_timer_event(struct work_struct *work)
{
struct asd_sas_event *ev =
container_of(work, struct asd_sas_event, work);
struct asd_sas_phy *phy = ev->phy;
sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
&phy->port_events_pending);
sas_deform_port(phy, 1);
}
void sas_porte_hard_reset(struct work_struct *work)
{
struct asd_sas_event *ev =
container_of(work, struct asd_sas_event, work);
struct asd_sas_phy *phy = ev->phy;
sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
&phy->port_events_pending);
sas_deform_port(phy, 1);
}
/* ---------- SAS port registration ---------- */
static void sas_init_port(struct asd_sas_port *port,
struct sas_ha_struct *sas_ha, int i)
{
memset(port, 0, sizeof(*port));
port->id = i;
INIT_LIST_HEAD(&port->dev_list);
spin_lock_init(&port->phy_list_lock);
INIT_LIST_HEAD(&port->phy_list);
port->ha = sas_ha;
spin_lock_init(&port->dev_list_lock);
}
int sas_register_ports(struct sas_ha_struct *sas_ha)
{
int i;
/* initialize the ports and discovery */
for (i = 0; i < sas_ha->num_phys; i++) {
struct asd_sas_port *port = sas_ha->sas_port[i];
sas_init_port(port, sas_ha, i);
sas_init_disc(&port->disc, port);
}
return 0;
}
void sas_unregister_ports(struct sas_ha_struct *sas_ha)
{
int i;
for (i = 0; i < sas_ha->num_phys; i++)
if (sas_ha->sas_phy[i]->port)
sas_deform_port(sas_ha->sas_phy[i], 0);
}