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LeafOS / LeafOS-Devices / android_kernel_samsung_gta4xl / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / drivers / s390 / scsi / zfcp_erp.c
blob: cfc0d8c588dfb8a653cfdd517de4e453867bc046 [file] [log] [blame]
/*
*
* linux/drivers/s390/scsi/zfcp_erp.c
*
* FCP adapter driver for IBM eServer zSeries
*
* (C) Copyright IBM Corp. 2002, 2004
*
* Author(s): Martin Peschke <mpeschke@de.ibm.com>
* Raimund Schroeder <raimund.schroeder@de.ibm.com>
* Aron Zeh
* Wolfgang Taphorn
* Stefan Bader <stefan.bader@de.ibm.com>
* Heiko Carstens <heiko.carstens@de.ibm.com>
* Andreas Herrmann <aherrman@de.ibm.com>
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_ERP
#define ZFCP_ERP_REVISION "$Revision: 1.86 $"
#include "zfcp_ext.h"
static int zfcp_erp_adisc(struct zfcp_adapter *, fc_id_t);
static void zfcp_erp_adisc_handler(unsigned long);
static int zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *, int);
static int zfcp_erp_port_forced_reopen_internal(struct zfcp_port *, int);
static int zfcp_erp_port_reopen_internal(struct zfcp_port *, int);
static int zfcp_erp_unit_reopen_internal(struct zfcp_unit *, int);
static int zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *, int);
static int zfcp_erp_unit_reopen_all_internal(struct zfcp_port *, int);
static void zfcp_erp_adapter_block(struct zfcp_adapter *, int);
static void zfcp_erp_adapter_unblock(struct zfcp_adapter *);
static void zfcp_erp_port_block(struct zfcp_port *, int);
static void zfcp_erp_port_unblock(struct zfcp_port *);
static void zfcp_erp_unit_block(struct zfcp_unit *, int);
static void zfcp_erp_unit_unblock(struct zfcp_unit *);
static int zfcp_erp_thread(void *);
static int zfcp_erp_strategy(struct zfcp_erp_action *);
static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *);
static int zfcp_erp_strategy_memwait(struct zfcp_erp_action *);
static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *, int);
static int zfcp_erp_strategy_check_unit(struct zfcp_unit *, int);
static int zfcp_erp_strategy_check_port(struct zfcp_port *, int);
static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *, int);
static int zfcp_erp_strategy_statechange(int, u32, struct zfcp_adapter *,
struct zfcp_port *,
struct zfcp_unit *, int);
static inline int zfcp_erp_strategy_statechange_detected(atomic_t *, u32);
static int zfcp_erp_strategy_followup_actions(int, struct zfcp_adapter *,
struct zfcp_port *,
struct zfcp_unit *, int);
static int zfcp_erp_strategy_check_queues(struct zfcp_adapter *);
static int zfcp_erp_strategy_check_action(struct zfcp_erp_action *, int);
static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *, int);
static int zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_close_qdio(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_close_fsf(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *);
static int zfcp_erp_adapter_strategy_open_fsf_statusread(
struct zfcp_erp_action *);
static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *);
static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_clearstati(struct zfcp_port *);
static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_open(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_open_nameserver_wakeup(
struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *);
static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *);
static int zfcp_erp_unit_strategy(struct zfcp_erp_action *);
static int zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *);
static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *);
static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *);
static int zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *);
static int zfcp_erp_action_dismiss_port(struct zfcp_port *);
static int zfcp_erp_action_dismiss_unit(struct zfcp_unit *);
static int zfcp_erp_action_dismiss(struct zfcp_erp_action *);
static int zfcp_erp_action_enqueue(int, struct zfcp_adapter *,
struct zfcp_port *, struct zfcp_unit *);
static int zfcp_erp_action_dequeue(struct zfcp_erp_action *);
static void zfcp_erp_action_cleanup(int, struct zfcp_adapter *,
struct zfcp_port *, struct zfcp_unit *,
int);
static void zfcp_erp_action_ready(struct zfcp_erp_action *);
static int zfcp_erp_action_exists(struct zfcp_erp_action *);
static inline void zfcp_erp_action_to_ready(struct zfcp_erp_action *);
static inline void zfcp_erp_action_to_running(struct zfcp_erp_action *);
static void zfcp_erp_memwait_handler(unsigned long);
static void zfcp_erp_timeout_handler(unsigned long);
static inline void zfcp_erp_timeout_init(struct zfcp_erp_action *);
/**
* zfcp_fsf_request_timeout_handler - called if a request timed out
* @data: pointer to adapter for handler function
*
* This function needs to be called if requests (ELS, Generic Service,
* or SCSI commands) exceed a certain time limit. The assumption is
* that after the time limit the adapter get stuck. So we trigger a reopen of
* the adapter. This should not be used for error recovery, SCSI abort
* commands and SCSI requests from SCSI mid-layer.
*/
void
zfcp_fsf_request_timeout_handler(unsigned long data)
{
struct zfcp_adapter *adapter;
adapter = (struct zfcp_adapter *) data;
zfcp_erp_adapter_reopen(adapter, 0);
}
/*
* function: zfcp_fsf_scsi_er_timeout_handler
*
* purpose: This function needs to be called whenever a SCSI error recovery
* action (abort/reset) does not return.
* Re-opening the adapter means that the command can be returned
* by zfcp (it is guarranteed that it does not return via the
* adapter anymore). The buffer can then be used again.
*
* returns: sod all
*/
void
zfcp_fsf_scsi_er_timeout_handler(unsigned long data)
{
struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
ZFCP_LOG_NORMAL("warning: SCSI error recovery timed out. "
"Restarting all operations on the adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
debug_text_event(adapter->erp_dbf, 1, "eh_lmem_tout");
zfcp_erp_adapter_reopen(adapter, 0);
return;
}
/*
* function:
*
* purpose: called if an adapter failed,
* initiates adapter recovery which is done
* asynchronously
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
int
zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *adapter, int clear_mask)
{
int retval;
debug_text_event(adapter->erp_dbf, 5, "a_ro");
ZFCP_LOG_DEBUG("reopen adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
zfcp_erp_adapter_block(adapter, clear_mask);
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
ZFCP_LOG_DEBUG("skipped reopen of failed adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
debug_text_event(adapter->erp_dbf, 5, "a_ro_f");
/* ensure propagation of failed status to new devices */
zfcp_erp_adapter_failed(adapter);
retval = -EIO;
goto out;
}
retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
adapter, NULL, NULL);
out:
return retval;
}
/*
* function:
*
* purpose: Wrappper for zfcp_erp_adapter_reopen_internal
* used to ensure the correct locking
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
int
zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear_mask)
{
int retval;
unsigned long flags;
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
retval = zfcp_erp_adapter_reopen_internal(adapter, clear_mask);
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
int
zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear_mask)
{
int retval;
retval = zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_COMMON_RUNNING |
ZFCP_STATUS_COMMON_ERP_FAILED |
clear_mask);
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
int
zfcp_erp_port_shutdown(struct zfcp_port *port, int clear_mask)
{
int retval;
retval = zfcp_erp_port_reopen(port,
ZFCP_STATUS_COMMON_RUNNING |
ZFCP_STATUS_COMMON_ERP_FAILED |
clear_mask);
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
int
zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear_mask)
{
int retval;
retval = zfcp_erp_unit_reopen(unit,
ZFCP_STATUS_COMMON_RUNNING |
ZFCP_STATUS_COMMON_ERP_FAILED |
clear_mask);
return retval;
}
/**
* zfcp_erp_adisc - send ADISC ELS command
* @adapter: adapter structure
* @d_id: d_id of port where ADISC is sent to
*/
int
zfcp_erp_adisc(struct zfcp_adapter *adapter, fc_id_t d_id)
{
struct zfcp_send_els *send_els;
struct zfcp_ls_adisc *adisc;
void *address = NULL;
int retval = 0;
struct timer_list *timer;
send_els = kmalloc(sizeof(struct zfcp_send_els), GFP_ATOMIC);
if (send_els == NULL)
goto nomem;
memset(send_els, 0, sizeof(*send_els));
send_els->req = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
if (send_els->req == NULL)
goto nomem;
memset(send_els->req, 0, sizeof(*send_els->req));
send_els->resp = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC);
if (send_els->resp == NULL)
goto nomem;
memset(send_els->resp, 0, sizeof(*send_els->resp));
address = (void *) get_zeroed_page(GFP_ATOMIC);
if (address == NULL)
goto nomem;
zfcp_address_to_sg(address, send_els->req);
address += PAGE_SIZE >> 1;
zfcp_address_to_sg(address, send_els->resp);
send_els->req_count = send_els->resp_count = 1;
send_els->adapter = adapter;
send_els->d_id = d_id;
send_els->handler = zfcp_erp_adisc_handler;
send_els->handler_data = (unsigned long) send_els;
adisc = zfcp_sg_to_address(send_els->req);
send_els->ls_code = adisc->code = ZFCP_LS_ADISC;
send_els->req->length = sizeof(struct zfcp_ls_adisc);
send_els->resp->length = sizeof(struct zfcp_ls_adisc_acc);
/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
without FC-AL-2 capability, so we don't set it */
adisc->wwpn = adapter->wwpn;
adisc->wwnn = adapter->wwnn;
adisc->nport_id = adapter->s_id;
ZFCP_LOG_INFO("ADISC request from s_id 0x%08x to d_id 0x%08x "
"(wwpn=0x%016Lx, wwnn=0x%016Lx, "
"hard_nport_id=0x%08x, nport_id=0x%08x)\n",
adapter->s_id, d_id, (wwn_t) adisc->wwpn,
(wwn_t) adisc->wwnn, adisc->hard_nport_id,
adisc->nport_id);
timer = kmalloc(sizeof(struct timer_list), GFP_ATOMIC);
if (!timer)
goto nomem;
init_timer(timer);
timer->function = zfcp_fsf_request_timeout_handler;
timer->data = (unsigned long) adapter;
timer->expires = ZFCP_FSF_REQUEST_TIMEOUT;
send_els->timer = timer;
retval = zfcp_fsf_send_els(send_els);
if (retval != 0) {
ZFCP_LOG_NORMAL("error: initiation of Send ELS failed for port "
"0x%08x on adapter %s\n", d_id,
zfcp_get_busid_by_adapter(adapter));
del_timer(send_els->timer);
goto freemem;
}
goto out;
nomem:
retval = -ENOMEM;
freemem:
if (address != NULL)
__free_pages(send_els->req->page, 0);
if (send_els != NULL) {
kfree(send_els->timer);
kfree(send_els->req);
kfree(send_els->resp);
kfree(send_els);
}
out:
return retval;
}
/**
* zfcp_erp_adisc_handler - handler for ADISC ELS command
* @data: pointer to struct zfcp_send_els
*
* If ADISC failed (LS_RJT or timed out) forced reopen of the port is triggered.
*/
void
zfcp_erp_adisc_handler(unsigned long data)
{
struct zfcp_send_els *send_els;
struct zfcp_port *port;
struct zfcp_adapter *adapter;
fc_id_t d_id;
struct zfcp_ls_adisc_acc *adisc;
send_els = (struct zfcp_send_els *) data;
del_timer(send_els->timer);
adapter = send_els->adapter;
d_id = send_els->d_id;
read_lock(&zfcp_data.config_lock);
port = zfcp_get_port_by_did(send_els->adapter, send_els->d_id);
read_unlock(&zfcp_data.config_lock);
BUG_ON(port == NULL);
/* request rejected or timed out */
if (send_els->status != 0) {
ZFCP_LOG_NORMAL("ELS request rejected/timed out, "
"force physical port reopen "
"(adapter %s, port d_id=0x%08x)\n",
zfcp_get_busid_by_adapter(adapter), d_id);
debug_text_event(adapter->erp_dbf, 3, "forcreop");
if (zfcp_erp_port_forced_reopen(port, 0))
ZFCP_LOG_NORMAL("failed reopen of port "
"(adapter %s, wwpn=0x%016Lx)\n",
zfcp_get_busid_by_port(port),
port->wwpn);
goto out;
}
adisc = zfcp_sg_to_address(send_els->resp);
ZFCP_LOG_INFO("ADISC response from d_id 0x%08x to s_id "
"0x%08x (wwpn=0x%016Lx, wwnn=0x%016Lx, "
"hard_nport_id=0x%08x, nport_id=0x%08x)\n",
d_id, adapter->s_id, (wwn_t) adisc->wwpn,
(wwn_t) adisc->wwnn, adisc->hard_nport_id,
adisc->nport_id);
/* set wwnn for port */
if (port->wwnn == 0)
port->wwnn = adisc->wwnn;
if (port->wwpn != adisc->wwpn) {
ZFCP_LOG_NORMAL("d_id assignment changed, reopening "
"port (adapter %s, wwpn=0x%016Lx, "
"adisc_resp_wwpn=0x%016Lx)\n",
zfcp_get_busid_by_port(port),
port->wwpn, (wwn_t) adisc->wwpn);
if (zfcp_erp_port_reopen(port, 0))
ZFCP_LOG_NORMAL("failed reopen of port "
"(adapter %s, wwpn=0x%016Lx)\n",
zfcp_get_busid_by_port(port),
port->wwpn);
}
out:
zfcp_port_put(port);
__free_pages(send_els->req->page, 0);
kfree(send_els->timer);
kfree(send_els->req);
kfree(send_els->resp);
kfree(send_els);
}
/**
* zfcp_test_link - lightweight link test procedure
* @port: port to be tested
*
* Test status of a link to a remote port using the ELS command ADISC.
*/
int
zfcp_test_link(struct zfcp_port *port)
{
int retval;
zfcp_port_get(port);
retval = zfcp_erp_adisc(port->adapter, port->d_id);
if (retval != 0) {
zfcp_port_put(port);
ZFCP_LOG_NORMAL("reopen needed for port 0x%016Lx "
"on adapter %s\n ", port->wwpn,
zfcp_get_busid_by_port(port));
retval = zfcp_erp_port_forced_reopen(port, 0);
if (retval != 0) {
ZFCP_LOG_NORMAL("reopen of remote port 0x%016Lx "
"on adapter %s failed\n", port->wwpn,
zfcp_get_busid_by_port(port));
retval = -EPERM;
}
}
return retval;
}
/*
* function:
*
* purpose: called if a port failed to be opened normally
* initiates Forced Reopen recovery which is done
* asynchronously
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
static int
zfcp_erp_port_forced_reopen_internal(struct zfcp_port *port, int clear_mask)
{
int retval;
struct zfcp_adapter *adapter = port->adapter;
debug_text_event(adapter->erp_dbf, 5, "pf_ro");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
ZFCP_LOG_DEBUG("forced reopen of port 0x%016Lx on adapter %s\n",
port->wwpn, zfcp_get_busid_by_port(port));
zfcp_erp_port_block(port, clear_mask);
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
ZFCP_LOG_DEBUG("skipped forced reopen of failed port 0x%016Lx "
"on adapter %s\n", port->wwpn,
zfcp_get_busid_by_port(port));
debug_text_event(adapter->erp_dbf, 5, "pf_ro_f");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
retval = -EIO;
goto out;
}
retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
port->adapter, port, NULL);
out:
return retval;
}
/*
* function:
*
* purpose: Wrappper for zfcp_erp_port_forced_reopen_internal
* used to ensure the correct locking
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
int
zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear_mask)
{
int retval;
unsigned long flags;
struct zfcp_adapter *adapter;
adapter = port->adapter;
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
retval = zfcp_erp_port_forced_reopen_internal(port, clear_mask);
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
return retval;
}
/*
* function:
*
* purpose: called if a port is to be opened
* initiates Reopen recovery which is done
* asynchronously
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
static int
zfcp_erp_port_reopen_internal(struct zfcp_port *port, int clear_mask)
{
int retval;
struct zfcp_adapter *adapter = port->adapter;
debug_text_event(adapter->erp_dbf, 5, "p_ro");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
ZFCP_LOG_DEBUG("reopen of port 0x%016Lx on adapter %s\n",
port->wwpn, zfcp_get_busid_by_port(port));
zfcp_erp_port_block(port, clear_mask);
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
ZFCP_LOG_DEBUG("skipped reopen of failed port 0x%016Lx "
"on adapter %s\n", port->wwpn,
zfcp_get_busid_by_port(port));
debug_text_event(adapter->erp_dbf, 5, "p_ro_f");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
/* ensure propagation of failed status to new devices */
zfcp_erp_port_failed(port);
retval = -EIO;
goto out;
}
retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
port->adapter, port, NULL);
out:
return retval;
}
/**
* zfcp_erp_port_reopen - initiate reopen of a remote port
* @port: port to be reopened
* @clear_mask: specifies flags in port status to be cleared
* Return: 0 on success, < 0 on error
*
* This is a wrappper function for zfcp_erp_port_reopen_internal. It ensures
* correct locking. An error recovery task is initiated to do the reopen.
* To wait for the completion of the reopen zfcp_erp_wait should be used.
*/
int
zfcp_erp_port_reopen(struct zfcp_port *port, int clear_mask)
{
int retval;
unsigned long flags;
struct zfcp_adapter *adapter = port->adapter;
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
retval = zfcp_erp_port_reopen_internal(port, clear_mask);
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
return retval;
}
/*
* function:
*
* purpose: called if a unit is to be opened
* initiates Reopen recovery which is done
* asynchronously
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
static int
zfcp_erp_unit_reopen_internal(struct zfcp_unit *unit, int clear_mask)
{
int retval;
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 5, "u_ro");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
ZFCP_LOG_DEBUG("reopen of unit 0x%016Lx on port 0x%016Lx "
"on adapter %s\n", unit->fcp_lun,
unit->port->wwpn, zfcp_get_busid_by_unit(unit));
zfcp_erp_unit_block(unit, clear_mask);
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) {
ZFCP_LOG_DEBUG("skipped reopen of failed unit 0x%016Lx "
"on port 0x%016Lx on adapter %s\n",
unit->fcp_lun, unit->port->wwpn,
zfcp_get_busid_by_unit(unit));
debug_text_event(adapter->erp_dbf, 5, "u_ro_f");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
sizeof (fcp_lun_t));
retval = -EIO;
goto out;
}
retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
unit->port->adapter, unit->port, unit);
out:
return retval;
}
/**
* zfcp_erp_unit_reopen - initiate reopen of a unit
* @unit: unit to be reopened
* @clear_mask: specifies flags in unit status to be cleared
* Return: 0 on success, < 0 on error
*
* This is a wrappper for zfcp_erp_unit_reopen_internal. It ensures correct
* locking. An error recovery task is initiated to do the reopen.
* To wait for the completion of the reopen zfcp_erp_wait should be used.
*/
int
zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear_mask)
{
int retval;
unsigned long flags;
struct zfcp_adapter *adapter;
struct zfcp_port *port;
port = unit->port;
adapter = port->adapter;
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
retval = zfcp_erp_unit_reopen_internal(unit, clear_mask);
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
return retval;
}
/*
* function:
*
* purpose: disable I/O,
* return any open requests and clean them up,
* aim: no pending and incoming I/O
*
* returns:
*/
static void
zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int clear_mask)
{
debug_text_event(adapter->erp_dbf, 6, "a_bl");
zfcp_erp_modify_adapter_status(adapter,
ZFCP_STATUS_COMMON_UNBLOCKED |
clear_mask, ZFCP_CLEAR);
}
/*
* function:
*
* purpose: enable I/O
*
* returns:
*/
static void
zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
{
debug_text_event(adapter->erp_dbf, 6, "a_ubl");
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
}
/*
* function:
*
* purpose: disable I/O,
* return any open requests and clean them up,
* aim: no pending and incoming I/O
*
* returns:
*/
static void
zfcp_erp_port_block(struct zfcp_port *port, int clear_mask)
{
struct zfcp_adapter *adapter = port->adapter;
debug_text_event(adapter->erp_dbf, 6, "p_bl");
debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
zfcp_erp_modify_port_status(port,
ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
ZFCP_CLEAR);
}
/*
* function:
*
* purpose: enable I/O
*
* returns:
*/
static void
zfcp_erp_port_unblock(struct zfcp_port *port)
{
struct zfcp_adapter *adapter = port->adapter;
debug_text_event(adapter->erp_dbf, 6, "p_ubl");
debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
}
/*
* function:
*
* purpose: disable I/O,
* return any open requests and clean them up,
* aim: no pending and incoming I/O
*
* returns:
*/
static void
zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
{
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 6, "u_bl");
debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
zfcp_erp_modify_unit_status(unit,
ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
ZFCP_CLEAR);
}
/*
* function:
*
* purpose: enable I/O
*
* returns:
*/
static void
zfcp_erp_unit_unblock(struct zfcp_unit *unit)
{
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 6, "u_ubl");
debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
}
/*
* function:
*
* purpose:
*
* returns:
*/
static void
zfcp_erp_action_ready(struct zfcp_erp_action *erp_action)
{
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 4, "a_ar");
debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int));
zfcp_erp_action_to_ready(erp_action);
up(&adapter->erp_ready_sem);
}
/*
* function:
*
* purpose:
*
* returns: <0 erp_action not found in any list
* ZFCP_ERP_ACTION_READY erp_action is in ready list
* ZFCP_ERP_ACTION_RUNNING erp_action is in running list
*
* locks: erp_lock must be held
*/
static int
zfcp_erp_action_exists(struct zfcp_erp_action *erp_action)
{
int retval = -EINVAL;
struct list_head *entry;
struct zfcp_erp_action *entry_erp_action;
struct zfcp_adapter *adapter = erp_action->adapter;
/* search in running list */
list_for_each(entry, &adapter->erp_running_head) {
entry_erp_action =
list_entry(entry, struct zfcp_erp_action, list);
if (entry_erp_action == erp_action) {
retval = ZFCP_ERP_ACTION_RUNNING;
goto out;
}
}
/* search in ready list */
list_for_each(entry, &adapter->erp_ready_head) {
entry_erp_action =
list_entry(entry, struct zfcp_erp_action, list);
if (entry_erp_action == erp_action) {
retval = ZFCP_ERP_ACTION_READY;
goto out;
}
}
out:
return retval;
}
/*
* purpose: checks current status of action (timed out, dismissed, ...)
* and does appropriate preparations (dismiss fsf request, ...)
*
* locks: called under erp_lock (disabled interrupts)
*
* returns: 0
*/
static int
zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action)
{
int retval = 0;
struct zfcp_fsf_req *fsf_req;
struct zfcp_adapter *adapter = erp_action->adapter;
if (erp_action->fsf_req) {
/* take lock to ensure that request is not being deleted meanwhile */
write_lock(&adapter->fsf_req_list_lock);
/* check whether fsf req does still exist */
list_for_each_entry(fsf_req, &adapter->fsf_req_list_head, list)
if (fsf_req == erp_action->fsf_req)
break;
if (fsf_req == erp_action->fsf_req) {
/* fsf_req still exists */
debug_text_event(adapter->erp_dbf, 3, "a_ca_req");
debug_event(adapter->erp_dbf, 3, &fsf_req,
sizeof (unsigned long));
/* dismiss fsf_req of timed out or dismissed erp_action */
if (erp_action->status & (ZFCP_STATUS_ERP_DISMISSED |
ZFCP_STATUS_ERP_TIMEDOUT)) {
debug_text_event(adapter->erp_dbf, 3,
"a_ca_disreq");
fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
}
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
ZFCP_LOG_NORMAL("error: erp step timed out "
"(action=%d, fsf_req=%p)\n ",
erp_action->action,
erp_action->fsf_req);
}
/*
* If fsf_req is neither dismissed nor completed
* then keep it running asynchronously and don't mess
* with the association of erp_action and fsf_req.
*/
if (fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
ZFCP_STATUS_FSFREQ_DISMISSED)) {
/* forget about association between fsf_req
and erp_action */
fsf_req->erp_action = NULL;
erp_action->fsf_req = NULL;
}
} else {
debug_text_event(adapter->erp_dbf, 3, "a_ca_gonereq");
/*
* even if this fsf_req has gone, forget about
* association between erp_action and fsf_req
*/
erp_action->fsf_req = NULL;
}
write_unlock(&adapter->fsf_req_list_lock);
} else
debug_text_event(adapter->erp_dbf, 3, "a_ca_noreq");
return retval;
}
/*
* purpose: generic handler for asynchronous events related to erp_action events
* (normal completion, time-out, dismissing, retry after
* low memory condition)
*
* note: deletion of timer is not required (e.g. in case of a time-out),
* but a second try does no harm,
* we leave it in here to allow for greater simplification
*
* returns: 0 - there was an action to handle
* !0 - otherwise
*/
static int
zfcp_erp_async_handler_nolock(struct zfcp_erp_action *erp_action,
unsigned long set_mask)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
debug_text_event(adapter->erp_dbf, 2, "a_asyh_ex");
debug_event(adapter->erp_dbf, 2, &erp_action->action,
sizeof (int));
if (!(set_mask & ZFCP_STATUS_ERP_TIMEDOUT))
del_timer(&erp_action->timer);
erp_action->status |= set_mask;
zfcp_erp_action_ready(erp_action);
retval = 0;
} else {
/* action is ready or gone - nothing to do */
debug_text_event(adapter->erp_dbf, 3, "a_asyh_gone");
debug_event(adapter->erp_dbf, 3, &erp_action->action,
sizeof (int));
retval = 1;
}
return retval;
}
/*
* purpose: generic handler for asynchronous events related to erp_action
* events (normal completion, time-out, dismissing, retry after
* low memory condition)
*
* note: deletion of timer is not required (e.g. in case of a time-out),
* but a second try does no harm,
* we leave it in here to allow for greater simplification
*
* returns: 0 - there was an action to handle
* !0 - otherwise
*/
int
zfcp_erp_async_handler(struct zfcp_erp_action *erp_action,
unsigned long set_mask)
{
struct zfcp_adapter *adapter = erp_action->adapter;
unsigned long flags;
int retval;
write_lock_irqsave(&adapter->erp_lock, flags);
retval = zfcp_erp_async_handler_nolock(erp_action, set_mask);
write_unlock_irqrestore(&adapter->erp_lock, flags);
return retval;
}
/*
* purpose: is called for erp_action which was slept waiting for
* memory becoming avaliable,
* will trigger that this action will be continued
*/
static void
zfcp_erp_memwait_handler(unsigned long data)
{
struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data;
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 2, "a_mwh");
debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
zfcp_erp_async_handler(erp_action, 0);
}
/*
* purpose: is called if an asynchronous erp step timed out,
* action gets an appropriate flag and will be processed
* accordingly
*/
static void
zfcp_erp_timeout_handler(unsigned long data)
{
struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data;
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 2, "a_th");
debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
zfcp_erp_async_handler(erp_action, ZFCP_STATUS_ERP_TIMEDOUT);
}
/*
* purpose: is called for an erp_action which needs to be ended
* though not being done,
* this is usually required if an higher is generated,
* action gets an appropriate flag and will be processed
* accordingly
*
* locks: erp_lock held (thus we need to call another handler variant)
*/
static int
zfcp_erp_action_dismiss(struct zfcp_erp_action *erp_action)
{
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 2, "a_adis");
debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int));
zfcp_erp_async_handler_nolock(erp_action, ZFCP_STATUS_ERP_DISMISSED);
return 0;
}
int
zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
{
int retval = 0;
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
rwlock_init(&adapter->erp_lock);
INIT_LIST_HEAD(&adapter->erp_ready_head);
INIT_LIST_HEAD(&adapter->erp_running_head);
sema_init(&adapter->erp_ready_sem, 0);
retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
if (retval < 0) {
ZFCP_LOG_NORMAL("error: creation of erp thread failed for "
"adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
debug_text_event(adapter->erp_dbf, 5, "a_thset_fail");
} else {
wait_event(adapter->erp_thread_wqh,
atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
&adapter->status));
debug_text_event(adapter->erp_dbf, 5, "a_thset_ok");
}
return (retval < 0);
}
/*
* function:
*
* purpose:
*
* returns:
*
* context: process (i.e. proc-fs or rmmod/insmod)
*
* note: The caller of this routine ensures that the specified
* adapter has been shut down and that this operation
* has been completed. Thus, there are no pending erp_actions
* which would need to be handled here.
*/
int
zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
{
int retval = 0;
atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
up(&adapter->erp_ready_sem);
wait_event(adapter->erp_thread_wqh,
!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
&adapter->status));
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
&adapter->status);
debug_text_event(adapter->erp_dbf, 5, "a_thki_ok");
return retval;
}
/*
* purpose: is run as a kernel thread,
* goes through list of error recovery actions of associated adapter
* and delegates single action to execution
*
* returns: 0
*/
static int
zfcp_erp_thread(void *data)
{
struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
struct list_head *next;
struct zfcp_erp_action *erp_action;
unsigned long flags;
daemonize("zfcperp%s", zfcp_get_busid_by_adapter(adapter));
/* Block all signals */
siginitsetinv(&current->blocked, 0);
atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
debug_text_event(adapter->erp_dbf, 5, "a_th_run");
wake_up(&adapter->erp_thread_wqh);
while (!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
&adapter->status)) {
write_lock_irqsave(&adapter->erp_lock, flags);
next = adapter->erp_ready_head.prev;
write_unlock_irqrestore(&adapter->erp_lock, flags);
if (next != &adapter->erp_ready_head) {
erp_action =
list_entry(next, struct zfcp_erp_action, list);
/*
* process action (incl. [re]moving it
* from 'ready' queue)
*/
zfcp_erp_strategy(erp_action);
}
/*
* sleep as long as there is nothing to do, i.e.
* no action in 'ready' queue to be processed and
* thread is not to be killed
*/
down_interruptible(&adapter->erp_ready_sem);
debug_text_event(adapter->erp_dbf, 5, "a_th_woken");
}
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
debug_text_event(adapter->erp_dbf, 5, "a_th_stop");
wake_up(&adapter->erp_thread_wqh);
return 0;
}
/*
* function:
*
* purpose: drives single error recovery action and schedules higher and
* subordinate actions, if necessary
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_SUCCEEDED - action finished successfully (deqd)
* ZFCP_ERP_FAILED - action finished unsuccessfully (deqd)
* ZFCP_ERP_EXIT - action finished (dequeued), offline
* ZFCP_ERP_DISMISSED - action canceled (dequeued)
*/
static int
zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
{
int retval = 0;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
struct zfcp_unit *unit = erp_action->unit;
int action = erp_action->action;
u32 status = erp_action->status;
unsigned long flags;
/* serialise dismissing, timing out, moving, enqueueing */
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
/* dequeue dismissed action and leave, if required */
retval = zfcp_erp_strategy_check_action(erp_action, retval);
if (retval == ZFCP_ERP_DISMISSED) {
debug_text_event(adapter->erp_dbf, 4, "a_st_dis1");
goto unlock;
}
/*
* move action to 'running' queue before processing it
* (to avoid a race condition regarding moving the
* action to the 'running' queue and back)
*/
zfcp_erp_action_to_running(erp_action);
/*
* try to process action as far as possible,
* no lock to allow for blocking operations (kmalloc, qdio, ...),
* afterwards the lock is required again for the following reasons:
* - dequeueing of finished action and enqueueing of
* follow-up actions must be atomic so that any other
* reopen-routine does not believe there is nothing to do
* and that it is safe to enqueue something else,
* - we want to force any control thread which is dismissing
* actions to finish this before we decide about
* necessary steps to be taken here further
*/
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
retval = zfcp_erp_strategy_do_action(erp_action);
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
/*
* check for dismissed status again to avoid follow-up actions,
* failing of targets and so on for dismissed actions
*/
retval = zfcp_erp_strategy_check_action(erp_action, retval);
switch (retval) {
case ZFCP_ERP_DISMISSED:
/* leave since this action has ridden to its ancestors */
debug_text_event(adapter->erp_dbf, 6, "a_st_dis2");
goto unlock;
case ZFCP_ERP_NOMEM:
/* no memory to continue immediately, let it sleep */
if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
++adapter->erp_low_mem_count;
erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
}
/* This condition is true if there is no memory available
for any erp_action on this adapter. This implies that there
are no elements in the memory pool(s) left for erp_actions.
This might happen if an erp_action that used a memory pool
element was timed out.
*/
if (adapter->erp_total_count == adapter->erp_low_mem_count) {
debug_text_event(adapter->erp_dbf, 3, "a_st_lowmem");
ZFCP_LOG_NORMAL("error: no mempool elements available, "
"restarting I/O on adapter %s "
"to free mempool\n",
zfcp_get_busid_by_adapter(adapter));
zfcp_erp_adapter_reopen_internal(adapter, 0);
} else {
debug_text_event(adapter->erp_dbf, 2, "a_st_memw");
retval = zfcp_erp_strategy_memwait(erp_action);
}
goto unlock;
case ZFCP_ERP_CONTINUES:
/* leave since this action runs asynchronously */
debug_text_event(adapter->erp_dbf, 6, "a_st_cont");
if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
--adapter->erp_low_mem_count;
erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
}
goto unlock;
}
/* ok, finished action (whatever its result is) */
/* check for unrecoverable targets */
retval = zfcp_erp_strategy_check_target(erp_action, retval);
/* action must be dequeued (here to allow for further ones) */
zfcp_erp_action_dequeue(erp_action);
/*
* put this target through the erp mill again if someone has
* requested to change the status of a target being online
* to offline or the other way around
* (old retval is preserved if nothing has to be done here)
*/
retval = zfcp_erp_strategy_statechange(action, status, adapter,
port, unit, retval);
/*
* leave if target is in permanent error state or if
* action is repeated in order to process state change
*/
if (retval == ZFCP_ERP_EXIT) {
debug_text_event(adapter->erp_dbf, 2, "a_st_exit");
goto unlock;
}
/* trigger follow up actions */
zfcp_erp_strategy_followup_actions(action, adapter, port, unit, retval);
unlock:
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
if (retval != ZFCP_ERP_CONTINUES)
zfcp_erp_action_cleanup(action, adapter, port, unit, retval);
/*
* a few tasks remain when the erp queues are empty
* (don't do that if the last action evaluated was dismissed
* since this clearly indicates that there is more to come) :
* - close the name server port if it is open yet
* (enqueues another [probably] final action)
* - otherwise, wake up whoever wants to be woken when we are
* done with erp
*/
if (retval != ZFCP_ERP_DISMISSED)
zfcp_erp_strategy_check_queues(adapter);
debug_text_event(adapter->erp_dbf, 6, "a_st_done");
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_DISMISSED - if action has been dismissed
* retval - otherwise
*/
static int
zfcp_erp_strategy_check_action(struct zfcp_erp_action *erp_action, int retval)
{
struct zfcp_adapter *adapter = erp_action->adapter;
zfcp_erp_strategy_check_fsfreq(erp_action);
debug_event(adapter->erp_dbf, 5, &erp_action->action, sizeof (int));
if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
debug_text_event(adapter->erp_dbf, 3, "a_stcd_dis");
zfcp_erp_action_dequeue(erp_action);
retval = ZFCP_ERP_DISMISSED;
} else
debug_text_event(adapter->erp_dbf, 5, "a_stcd_nodis");
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_FAILED;
struct zfcp_adapter *adapter = erp_action->adapter;
/*
* try to execute/continue action as far as possible,
* note: no lock in subsequent strategy routines
* (this allows these routine to call schedule, e.g.
* kmalloc with such flags or qdio_initialize & friends)
* Note: in case of timeout, the seperate strategies will fail
* anyhow. No need for a special action. Even worse, a nameserver
* failure would not wake up waiting ports without the call.
*/
switch (erp_action->action) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
retval = zfcp_erp_adapter_strategy(erp_action);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
retval = zfcp_erp_port_forced_strategy(erp_action);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
retval = zfcp_erp_port_strategy(erp_action);
break;
case ZFCP_ERP_ACTION_REOPEN_UNIT:
retval = zfcp_erp_unit_strategy(erp_action);
break;
default:
debug_text_exception(adapter->erp_dbf, 1, "a_stda_bug");
debug_event(adapter->erp_dbf, 1, &erp_action->action,
sizeof (int));
ZFCP_LOG_NORMAL("bug: unknown erp action requested on "
"adapter %s (action=%d)\n",
zfcp_get_busid_by_adapter(erp_action->adapter),
erp_action->action);
}
return retval;
}
/*
* function:
*
* purpose: triggers retry of this action after a certain amount of time
* by means of timer provided by erp_action
*
* returns: ZFCP_ERP_CONTINUES - erp_action sleeps in erp running queue
*/
static int
zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_CONTINUES;
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 6, "a_mwinit");
debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
init_timer(&erp_action->timer);
erp_action->timer.function = zfcp_erp_memwait_handler;
erp_action->timer.data = (unsigned long) erp_action;
erp_action->timer.expires = jiffies + ZFCP_ERP_MEMWAIT_TIMEOUT;
add_timer(&erp_action->timer);
return retval;
}
/*
* function: zfcp_erp_adapter_failed
*
* purpose: sets the adapter and all underlying devices to ERP_FAILED
*
*/
void
zfcp_erp_adapter_failed(struct zfcp_adapter *adapter)
{
zfcp_erp_modify_adapter_status(adapter,
ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
ZFCP_LOG_NORMAL("adapter erp failed on adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
debug_text_event(adapter->erp_dbf, 2, "a_afail");
}
/*
* function: zfcp_erp_port_failed
*
* purpose: sets the port and all underlying devices to ERP_FAILED
*
*/
void
zfcp_erp_port_failed(struct zfcp_port *port)
{
zfcp_erp_modify_port_status(port,
ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
if (atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
ZFCP_LOG_NORMAL("port erp failed (adapter %s, "
"port d_id=0x%08x)\n",
zfcp_get_busid_by_port(port), port->d_id);
else
ZFCP_LOG_NORMAL("port erp failed (adapter %s, wwpn=0x%016Lx)\n",
zfcp_get_busid_by_port(port), port->wwpn);
debug_text_event(port->adapter->erp_dbf, 2, "p_pfail");
debug_event(port->adapter->erp_dbf, 2, &port->wwpn, sizeof (wwn_t));
}
/*
* function: zfcp_erp_unit_failed
*
* purpose: sets the unit to ERP_FAILED
*
*/
void
zfcp_erp_unit_failed(struct zfcp_unit *unit)
{
zfcp_erp_modify_unit_status(unit,
ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
ZFCP_LOG_NORMAL("unit erp failed on unit 0x%016Lx on port 0x%016Lx "
" on adapter %s\n", unit->fcp_lun,
unit->port->wwpn, zfcp_get_busid_by_unit(unit));
debug_text_event(unit->port->adapter->erp_dbf, 2, "u_ufail");
debug_event(unit->port->adapter->erp_dbf, 2,
&unit->fcp_lun, sizeof (fcp_lun_t));
}
/*
* function: zfcp_erp_strategy_check_target
*
* purpose: increments the erp action count on the device currently in
* recovery if the action failed or resets the count in case of
* success. If a maximum count is exceeded the device is marked
* as ERP_FAILED.
* The 'blocked' state of a target which has been recovered
* successfully is reset.
*
* returns: ZFCP_ERP_CONTINUES - action continues (not considered)
* ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_EXIT - action failed and will not continue
*/
static int
zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action, int result)
{
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
struct zfcp_unit *unit = erp_action->unit;
debug_text_event(adapter->erp_dbf, 5, "a_stct_norm");
debug_event(adapter->erp_dbf, 5, &erp_action->action, sizeof (int));
debug_event(adapter->erp_dbf, 5, &result, sizeof (int));
switch (erp_action->action) {
case ZFCP_ERP_ACTION_REOPEN_UNIT:
result = zfcp_erp_strategy_check_unit(unit, result);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
case ZFCP_ERP_ACTION_REOPEN_PORT:
result = zfcp_erp_strategy_check_port(port, result);
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
result = zfcp_erp_strategy_check_adapter(adapter, result);
break;
}
return result;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_strategy_statechange(int action,
u32 status,
struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct zfcp_unit *unit, int retval)
{
debug_text_event(adapter->erp_dbf, 3, "a_stsc");
debug_event(adapter->erp_dbf, 3, &action, sizeof (int));
switch (action) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (zfcp_erp_strategy_statechange_detected(&adapter->status,
status)) {
zfcp_erp_adapter_reopen_internal(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
retval = ZFCP_ERP_EXIT;
}
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
case ZFCP_ERP_ACTION_REOPEN_PORT:
if (zfcp_erp_strategy_statechange_detected(&port->status,
status)) {
zfcp_erp_port_reopen_internal(port, ZFCP_STATUS_COMMON_ERP_FAILED);
retval = ZFCP_ERP_EXIT;
}
break;
case ZFCP_ERP_ACTION_REOPEN_UNIT:
if (zfcp_erp_strategy_statechange_detected(&unit->status,
status)) {
zfcp_erp_unit_reopen_internal(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
retval = ZFCP_ERP_EXIT;
}
break;
}
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static inline int
zfcp_erp_strategy_statechange_detected(atomic_t * target_status, u32 erp_status)
{
return
/* take it online */
(atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, target_status) &&
(ZFCP_STATUS_ERP_CLOSE_ONLY & erp_status)) ||
/* take it offline */
(!atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, target_status) &&
!(ZFCP_STATUS_ERP_CLOSE_ONLY & erp_status));
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
{
debug_text_event(unit->port->adapter->erp_dbf, 5, "u_stct");
debug_event(unit->port->adapter->erp_dbf, 5, &unit->fcp_lun,
sizeof (fcp_lun_t));
switch (result) {
case ZFCP_ERP_SUCCEEDED :
atomic_set(&unit->erp_counter, 0);
zfcp_erp_unit_unblock(unit);
break;
case ZFCP_ERP_FAILED :
atomic_inc(&unit->erp_counter);
if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS)
zfcp_erp_unit_failed(unit);
break;
case ZFCP_ERP_EXIT :
/* nothing */
break;
}
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) {
zfcp_erp_unit_block(unit, 0); /* for ZFCP_ERP_SUCCEEDED */
result = ZFCP_ERP_EXIT;
}
return result;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
{
debug_text_event(port->adapter->erp_dbf, 5, "p_stct");
debug_event(port->adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
switch (result) {
case ZFCP_ERP_SUCCEEDED :
atomic_set(&port->erp_counter, 0);
zfcp_erp_port_unblock(port);
break;
case ZFCP_ERP_FAILED :
atomic_inc(&port->erp_counter);
if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS)
zfcp_erp_port_failed(port);
break;
case ZFCP_ERP_EXIT :
/* nothing */
break;
}
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
zfcp_erp_port_block(port, 0); /* for ZFCP_ERP_SUCCEEDED */
result = ZFCP_ERP_EXIT;
}
return result;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter, int result)
{
debug_text_event(adapter->erp_dbf, 5, "a_stct");
switch (result) {
case ZFCP_ERP_SUCCEEDED :
atomic_set(&adapter->erp_counter, 0);
zfcp_erp_adapter_unblock(adapter);
break;
case ZFCP_ERP_FAILED :
atomic_inc(&adapter->erp_counter);
if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS)
zfcp_erp_adapter_failed(adapter);
break;
case ZFCP_ERP_EXIT :
/* nothing */
break;
}
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
zfcp_erp_adapter_block(adapter, 0); /* for ZFCP_ERP_SUCCEEDED */
result = ZFCP_ERP_EXIT;
}
return result;
}
/*
* function:
*
* purpose: remaining things in good cases,
* escalation in bad cases
*
* returns:
*/
static int
zfcp_erp_strategy_followup_actions(int action,
struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct zfcp_unit *unit, int status)
{
debug_text_event(adapter->erp_dbf, 5, "a_stfol");
debug_event(adapter->erp_dbf, 5, &action, sizeof (int));
/* initiate follow-up actions depending on success of finished action */
switch (action) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (status == ZFCP_ERP_SUCCEEDED)
zfcp_erp_port_reopen_all_internal(adapter, 0);
else
zfcp_erp_adapter_reopen_internal(adapter, 0);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
if (status == ZFCP_ERP_SUCCEEDED)
zfcp_erp_port_reopen_internal(port, 0);
else
zfcp_erp_adapter_reopen_internal(adapter, 0);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
if (status == ZFCP_ERP_SUCCEEDED)
zfcp_erp_unit_reopen_all_internal(port, 0);
else
zfcp_erp_port_forced_reopen_internal(port, 0);
break;
case ZFCP_ERP_ACTION_REOPEN_UNIT:
if (status == ZFCP_ERP_SUCCEEDED) ; /* no further action */
else
zfcp_erp_port_reopen_internal(unit->port, 0);
break;
}
return 0;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_strategy_check_queues(struct zfcp_adapter *adapter)
{
unsigned long flags;
read_lock_irqsave(&zfcp_data.config_lock, flags);
read_lock(&adapter->erp_lock);
if (list_empty(&adapter->erp_ready_head) &&
list_empty(&adapter->erp_running_head)) {
debug_text_event(adapter->erp_dbf, 4, "a_cq_wake");
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
&adapter->status);
wake_up(&adapter->erp_done_wqh);
} else
debug_text_event(adapter->erp_dbf, 5, "a_cq_notempty");
read_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
return 0;
}
/**
* zfcp_erp_wait - wait for completion of error recovery on an adapter
* @adapter: adapter for which to wait for completion of its error recovery
* Return: 0
*/
int
zfcp_erp_wait(struct zfcp_adapter *adapter)
{
int retval = 0;
wait_event(adapter->erp_done_wqh,
!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
&adapter->status));
return retval;
}
/*
* function: zfcp_erp_modify_adapter_status
*
* purpose:
*
*/
void
zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter,
u32 mask, int set_or_clear)
{
struct zfcp_port *port;
u32 common_mask = mask & ZFCP_COMMON_FLAGS;
if (set_or_clear == ZFCP_SET) {
atomic_set_mask(mask, &adapter->status);
debug_text_event(adapter->erp_dbf, 3, "a_mod_as_s");
} else {
atomic_clear_mask(mask, &adapter->status);
if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
atomic_set(&adapter->erp_counter, 0);
debug_text_event(adapter->erp_dbf, 3, "a_mod_as_c");
}
debug_event(adapter->erp_dbf, 3, &mask, sizeof (u32));
/* Deal with all underlying devices, only pass common_mask */
if (common_mask)
list_for_each_entry(port, &adapter->port_list_head, list)
zfcp_erp_modify_port_status(port, common_mask,
set_or_clear);
}
/*
* function: zfcp_erp_modify_port_status
*
* purpose: sets the port and all underlying devices to ERP_FAILED
*
*/
void
zfcp_erp_modify_port_status(struct zfcp_port *port, u32 mask, int set_or_clear)
{
struct zfcp_unit *unit;
u32 common_mask = mask & ZFCP_COMMON_FLAGS;
if (set_or_clear == ZFCP_SET) {
atomic_set_mask(mask, &port->status);
debug_text_event(port->adapter->erp_dbf, 3, "p_mod_ps_s");
} else {
atomic_clear_mask(mask, &port->status);
if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
atomic_set(&port->erp_counter, 0);
debug_text_event(port->adapter->erp_dbf, 3, "p_mod_ps_c");
}
debug_event(port->adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
debug_event(port->adapter->erp_dbf, 3, &mask, sizeof (u32));
/* Modify status of all underlying devices, only pass common mask */
if (common_mask)
list_for_each_entry(unit, &port->unit_list_head, list)
zfcp_erp_modify_unit_status(unit, common_mask,
set_or_clear);
}
/*
* function: zfcp_erp_modify_unit_status
*
* purpose: sets the unit to ERP_FAILED
*
*/
void
zfcp_erp_modify_unit_status(struct zfcp_unit *unit, u32 mask, int set_or_clear)
{
if (set_or_clear == ZFCP_SET) {
atomic_set_mask(mask, &unit->status);
debug_text_event(unit->port->adapter->erp_dbf, 3, "u_mod_us_s");
} else {
atomic_clear_mask(mask, &unit->status);
if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
atomic_set(&unit->erp_counter, 0);
}
debug_text_event(unit->port->adapter->erp_dbf, 3, "u_mod_us_c");
}
debug_event(unit->port->adapter->erp_dbf, 3, &unit->fcp_lun,
sizeof (fcp_lun_t));
debug_event(unit->port->adapter->erp_dbf, 3, &mask, sizeof (u32));
}
/*
* function:
*
* purpose: Wrappper for zfcp_erp_port_reopen_all_internal
* used to ensure the correct locking
*
* returns: 0 - initiated action succesfully
* <0 - failed to initiate action
*/
int
zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter, int clear_mask)
{
int retval;
unsigned long flags;
read_lock_irqsave(&zfcp_data.config_lock, flags);
write_lock(&adapter->erp_lock);
retval = zfcp_erp_port_reopen_all_internal(adapter, clear_mask);
write_unlock(&adapter->erp_lock);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: FIXME
*/
static int
zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *adapter, int clear_mask)
{
int retval = 0;
struct zfcp_port *port;
list_for_each_entry(port, &adapter->port_list_head, list)
if (!atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
zfcp_erp_port_reopen_internal(port, clear_mask);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: FIXME
*/
static int
zfcp_erp_unit_reopen_all_internal(struct zfcp_port *port, int clear_mask)
{
int retval = 0;
struct zfcp_unit *unit;
list_for_each_entry(unit, &port->unit_list_head, list)
zfcp_erp_unit_reopen_internal(unit, clear_mask);
return retval;
}
/*
* function:
*
* purpose: this routine executes the 'Reopen Adapter' action
* (the entire action is processed synchronously, since
* there are no actions which might be run concurrently
* per definition)
*
* returns: ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_adapter_strategy(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
retval = zfcp_erp_adapter_strategy_close(erp_action);
if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
retval = ZFCP_ERP_EXIT;
else
retval = zfcp_erp_adapter_strategy_open(erp_action);
debug_text_event(adapter->erp_dbf, 3, "a_ast/ret");
debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
if (retval == ZFCP_ERP_FAILED) {
ZFCP_LOG_INFO("Waiting to allow the adapter %s "
"to recover itself\n",
zfcp_get_busid_by_adapter(adapter));
msleep(jiffies_to_msecs(ZFCP_TYPE2_RECOVERY_TIME));
}
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *erp_action)
{
int retval;
atomic_set_mask(ZFCP_STATUS_COMMON_CLOSING,
&erp_action->adapter->status);
retval = zfcp_erp_adapter_strategy_generic(erp_action, 1);
atomic_clear_mask(ZFCP_STATUS_COMMON_CLOSING,
&erp_action->adapter->status);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *erp_action)
{
int retval;
atomic_set_mask(ZFCP_STATUS_COMMON_OPENING,
&erp_action->adapter->status);
retval = zfcp_erp_adapter_strategy_generic(erp_action, 0);
atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING,
&erp_action->adapter->status);
return retval;
}
/*
* function: zfcp_register_adapter
*
* purpose: allocate the irq associated with this devno and register
* the FSF adapter with the SCSI stack
*
* returns:
*/
static int
zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *erp_action, int close)
{
int retval = ZFCP_ERP_SUCCEEDED;
if (close)
goto close_only;
retval = zfcp_erp_adapter_strategy_open_qdio(erp_action);
if (retval != ZFCP_ERP_SUCCEEDED)
goto failed_qdio;
retval = zfcp_erp_adapter_strategy_open_fsf(erp_action);
if (retval != ZFCP_ERP_SUCCEEDED)
goto failed_openfcp;
atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &erp_action->adapter->status);
goto out;
close_only:
atomic_clear_mask(ZFCP_STATUS_COMMON_OPEN,
&erp_action->adapter->status);
failed_openfcp:
zfcp_erp_adapter_strategy_close_qdio(erp_action);
zfcp_erp_adapter_strategy_close_fsf(erp_action);
failed_qdio:
out:
return retval;
}
/*
* function: zfcp_qdio_init
*
* purpose: setup QDIO operation for specified adapter
*
* returns: 0 - successful setup
* !0 - failed setup
*/
int
zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *erp_action)
{
int retval;
int i;
volatile struct qdio_buffer_element *sbale;
struct zfcp_adapter *adapter = erp_action->adapter;
if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
ZFCP_LOG_NORMAL("bug: second attempt to set up QDIO on "
"adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
goto failed_sanity;
}
if (qdio_establish(&adapter->qdio_init_data) != 0) {
ZFCP_LOG_INFO("error: establishment of QDIO queues failed "
"on adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
goto failed_qdio_establish;
}
debug_text_event(adapter->erp_dbf, 3, "qdio_est");
if (qdio_activate(adapter->ccw_device, 0) != 0) {
ZFCP_LOG_INFO("error: activation of QDIO queues failed "
"on adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
goto failed_qdio_activate;
}
debug_text_event(adapter->erp_dbf, 3, "qdio_act");
/*
* put buffers into response queue,
*/
for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
sbale = &(adapter->response_queue.buffer[i]->element[0]);
sbale->length = 0;
sbale->flags = SBAL_FLAGS_LAST_ENTRY;
sbale->addr = 0;
}
ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
"queue_no=%i, index_in_queue=%i, count=%i)\n",
zfcp_get_busid_by_adapter(adapter),
QDIO_FLAG_SYNC_INPUT, 0, 0, QDIO_MAX_BUFFERS_PER_Q);
retval = do_QDIO(adapter->ccw_device,
QDIO_FLAG_SYNC_INPUT,
0, 0, QDIO_MAX_BUFFERS_PER_Q, NULL);
if (retval) {
ZFCP_LOG_NORMAL("bug: setup of QDIO failed (retval=%d)\n",
retval);
goto failed_do_qdio;
} else {
adapter->response_queue.free_index = 0;
atomic_set(&adapter->response_queue.free_count, 0);
ZFCP_LOG_DEBUG("%i buffers successfully enqueued to "
"response queue\n", QDIO_MAX_BUFFERS_PER_Q);
}
/* set index of first avalable SBALS / number of available SBALS */
adapter->request_queue.free_index = 0;
atomic_set(&adapter->request_queue.free_count, QDIO_MAX_BUFFERS_PER_Q);
adapter->request_queue.distance_from_int = 0;
/* initialize waitqueue used to wait for free SBALs in requests queue */
init_waitqueue_head(&adapter->request_wq);
/* ok, we did it - skip all cleanups for different failures */
atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
retval = ZFCP_ERP_SUCCEEDED;
goto out;
failed_do_qdio:
/* NOP */
failed_qdio_activate:
debug_text_event(adapter->erp_dbf, 3, "qdio_down1a");
while (qdio_shutdown(adapter->ccw_device,
QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
msleep(1000);
debug_text_event(adapter->erp_dbf, 3, "qdio_down1b");
failed_qdio_establish:
failed_sanity:
retval = ZFCP_ERP_FAILED;
out:
return retval;
}
/*
* function: zfcp_qdio_cleanup
*
* purpose: cleans up QDIO operation for the specified adapter
*
* returns: 0 - successful cleanup
* !0 - failed cleanup
*/
int
zfcp_erp_adapter_strategy_close_qdio(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_SUCCEEDED;
int first_used;
int used_count;
struct zfcp_adapter *adapter = erp_action->adapter;
if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status)) {
ZFCP_LOG_DEBUG("error: attempt to shut down inactive QDIO "
"queues on adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
retval = ZFCP_ERP_FAILED;
goto out;
}
/*
* Get queue_lock and clear QDIOUP flag. Thus it's guaranteed that
* do_QDIO won't be called while qdio_shutdown is in progress.
*/
write_lock_irq(&adapter->request_queue.queue_lock);
atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
write_unlock_irq(&adapter->request_queue.queue_lock);
debug_text_event(adapter->erp_dbf, 3, "qdio_down2a");
while (qdio_shutdown(adapter->ccw_device,
QDIO_FLAG_CLEANUP_USING_CLEAR) == -EINPROGRESS)
msleep(1000);
debug_text_event(adapter->erp_dbf, 3, "qdio_down2b");
/*
* First we had to stop QDIO operation.
* Now it is safe to take the following actions.
*/
/* Cleanup only necessary when there are unacknowledged buffers */
if (atomic_read(&adapter->request_queue.free_count)
< QDIO_MAX_BUFFERS_PER_Q) {
first_used = (adapter->request_queue.free_index +
atomic_read(&adapter->request_queue.free_count))
% QDIO_MAX_BUFFERS_PER_Q;
used_count = QDIO_MAX_BUFFERS_PER_Q -
atomic_read(&adapter->request_queue.free_count);
zfcp_qdio_zero_sbals(adapter->request_queue.buffer,
first_used, used_count);
}
adapter->response_queue.free_index = 0;
atomic_set(&adapter->response_queue.free_count, 0);
adapter->request_queue.free_index = 0;
atomic_set(&adapter->request_queue.free_count, 0);
adapter->request_queue.distance_from_int = 0;
out:
return retval;
}
/*
* function: zfcp_fsf_init
*
* purpose: initializes FSF operation for the specified adapter
*
* returns: 0 - succesful initialization of FSF operation
* !0 - failed to initialize FSF operation
*/
static int
zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *erp_action)
{
int retval;
/* do 'exchange configuration data' */
retval = zfcp_erp_adapter_strategy_open_fsf_xconfig(erp_action);
if (retval == ZFCP_ERP_FAILED)
return retval;
/* start the desired number of Status Reads */
retval = zfcp_erp_adapter_strategy_open_fsf_statusread(erp_action);
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_SUCCEEDED;
int retries;
struct zfcp_adapter *adapter = erp_action->adapter;
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
retries = ZFCP_EXCHANGE_CONFIG_DATA_RETRIES;
do {
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status);
ZFCP_LOG_DEBUG("Doing exchange config data\n");
zfcp_erp_action_to_running(erp_action);
zfcp_erp_timeout_init(erp_action);
if (zfcp_fsf_exchange_config_data(erp_action)) {
retval = ZFCP_ERP_FAILED;
debug_text_event(adapter->erp_dbf, 5, "a_fstx_xf");
ZFCP_LOG_INFO("error: initiation of exchange of "
"configuration data failed for "
"adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
break;
}
debug_text_event(adapter->erp_dbf, 6, "a_fstx_xok");
ZFCP_LOG_DEBUG("Xchange underway\n");
/*
* Why this works:
* Both the normal completion handler as well as the timeout
* handler will do an 'up' when the 'exchange config data'
* request completes or times out. Thus, the signal to go on
* won't be lost utilizing this semaphore.
* Furthermore, this 'adapter_reopen' action is
* guaranteed to be the only action being there (highest action
* which prevents other actions from being created).
* Resulting from that, the wake signal recognized here
* _must_ be the one belonging to the 'exchange config
* data' request.
*/
down(&adapter->erp_ready_sem);
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
ZFCP_LOG_INFO("error: exchange of configuration data "
"for adapter %s timed out\n",
zfcp_get_busid_by_adapter(adapter));
break;
}
if (atomic_test_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status)) {
ZFCP_LOG_DEBUG("host connection still initialising... "
"waiting and retrying...\n");
/* sleep a little bit before retry */
msleep(jiffies_to_msecs(ZFCP_EXCHANGE_CONFIG_DATA_SLEEP));
}
} while ((retries--) &&
atomic_test_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status));
if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
&adapter->status)) {
ZFCP_LOG_INFO("error: exchange of configuration data for "
"adapter %s failed\n",
zfcp_get_busid_by_adapter(adapter));
retval = ZFCP_ERP_FAILED;
}
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_adapter_strategy_open_fsf_statusread(struct zfcp_erp_action
*erp_action)
{
int retval = ZFCP_ERP_SUCCEEDED;
int temp_ret;
struct zfcp_adapter *adapter = erp_action->adapter;
int i;
adapter->status_read_failed = 0;
for (i = 0; i < ZFCP_STATUS_READS_RECOM; i++) {
temp_ret = zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL);
if (temp_ret < 0) {
ZFCP_LOG_INFO("error: set-up of unsolicited status "
"notification failed on adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
retval = ZFCP_ERP_FAILED;
i--;
break;
}
}
return retval;
}
/*
* function: zfcp_fsf_cleanup
*
* purpose: cleanup FSF operation for specified adapter
*
* returns: 0 - FSF operation successfully cleaned up
* !0 - failed to cleanup FSF operation for this adapter
*/
static int
zfcp_erp_adapter_strategy_close_fsf(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_SUCCEEDED;
struct zfcp_adapter *adapter = erp_action->adapter;
/*
* wake waiting initiators of requests,
* return SCSI commands (with error status),
* clean up all requests (synchronously)
*/
zfcp_fsf_req_dismiss_all(adapter);
/* reset FSF request sequence number */
adapter->fsf_req_seq_no = 0;
/* all ports and units are closed */
zfcp_erp_modify_adapter_status(adapter,
ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
return retval;
}
/*
* function:
*
* purpose: this routine executes the 'Reopen Physical Port' action
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_FAILED;
struct zfcp_port *port = erp_action->port;
struct zfcp_adapter *adapter = erp_action->adapter;
switch (erp_action->step) {
/*
* FIXME:
* the ULP spec. begs for waiting for oustanding commands
*/
case ZFCP_ERP_STEP_UNINITIALIZED:
zfcp_erp_port_strategy_clearstati(port);
/*
* it would be sufficient to test only the normal open flag
* since the phys. open flag cannot be set if the normal
* open flag is unset - however, this is for readabilty ...
*/
if (atomic_test_mask((ZFCP_STATUS_PORT_PHYS_OPEN |
ZFCP_STATUS_COMMON_OPEN),
&port->status)) {
ZFCP_LOG_DEBUG("port 0x%016Lx is open -> trying "
"close physical\n", port->wwpn);
retval =
zfcp_erp_port_forced_strategy_close(erp_action);
} else
retval = ZFCP_ERP_FAILED;
break;
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
if (atomic_test_mask(ZFCP_STATUS_PORT_PHYS_OPEN,
&port->status)) {
ZFCP_LOG_DEBUG("close physical failed for port "
"0x%016Lx\n", port->wwpn);
retval = ZFCP_ERP_FAILED;
} else
retval = ZFCP_ERP_SUCCEEDED;
break;
}
debug_text_event(adapter->erp_dbf, 3, "p_pfst/ret");
debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
return retval;
}
/*
* function:
*
* purpose: this routine executes the 'Reopen Port' action
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_FAILED;
struct zfcp_port *port = erp_action->port;
struct zfcp_adapter *adapter = erp_action->adapter;
switch (erp_action->step) {
/*
* FIXME:
* the ULP spec. begs for waiting for oustanding commands
*/
case ZFCP_ERP_STEP_UNINITIALIZED:
zfcp_erp_port_strategy_clearstati(port);
if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
ZFCP_LOG_DEBUG("port 0x%016Lx is open -> trying "
"close\n", port->wwpn);
retval = zfcp_erp_port_strategy_close(erp_action);
goto out;
} /* else it's already closed, open it */
break;
case ZFCP_ERP_STEP_PORT_CLOSING:
if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
ZFCP_LOG_DEBUG("close failed for port 0x%016Lx\n",
port->wwpn);
retval = ZFCP_ERP_FAILED;
goto out;
} /* else it's closed now, open it */
break;
}
if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
retval = ZFCP_ERP_EXIT;
else
retval = zfcp_erp_port_strategy_open(erp_action);
out:
debug_text_event(adapter->erp_dbf, 3, "p_pst/ret");
debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof (wwn_t));
debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_port_strategy_open(struct zfcp_erp_action *erp_action)
{
int retval;
if (atomic_test_mask(ZFCP_STATUS_PORT_WKA,
&erp_action->port->status))
retval = zfcp_erp_port_strategy_open_nameserver(erp_action);
else
retval = zfcp_erp_port_strategy_open_common(erp_action);
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*
* FIXME(design): currently only prepared for fabric (nameserver!)
*/
static int
zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *erp_action)
{
int retval = 0;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
switch (erp_action->step) {
case ZFCP_ERP_STEP_UNINITIALIZED:
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_CLOSING:
if (!(adapter->nameserver_port)) {
retval = zfcp_nameserver_enqueue(adapter);
if (retval != 0) {
ZFCP_LOG_NORMAL("error: nameserver port "
"unavailable for adapter %s\n",
zfcp_get_busid_by_adapter(adapter));
retval = ZFCP_ERP_FAILED;
break;
}
}
if (!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&adapter->nameserver_port->status)) {
ZFCP_LOG_DEBUG("nameserver port is not open -> open "
"nameserver port\n");
/* nameserver port may live again */
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING,
&adapter->nameserver_port->status);
if (zfcp_erp_port_reopen(adapter->nameserver_port, 0)
>= 0) {
erp_action->step =
ZFCP_ERP_STEP_NAMESERVER_OPEN;
retval = ZFCP_ERP_CONTINUES;
} else
retval = ZFCP_ERP_FAILED;
break;
}
/* else nameserver port is already open, fall through */
case ZFCP_ERP_STEP_NAMESERVER_OPEN:
if (!atomic_test_mask(ZFCP_STATUS_COMMON_OPEN,
&adapter->nameserver_port->status)) {
ZFCP_LOG_DEBUG("open failed for nameserver port\n");
retval = ZFCP_ERP_FAILED;
} else {
ZFCP_LOG_DEBUG("nameserver port is open -> "
"nameserver look-up for port 0x%016Lx\n",
port->wwpn);
retval = zfcp_erp_port_strategy_open_common_lookup
(erp_action);
}
break;
case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
if (!atomic_test_mask(ZFCP_STATUS_PORT_DID_DID, &port->status)) {
if (atomic_test_mask
(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status)) {
ZFCP_LOG_DEBUG("nameserver look-up failed "
"for port 0x%016Lx "
"(misconfigured WWPN?)\n",
port->wwpn);
zfcp_erp_port_failed(port);
retval = ZFCP_ERP_EXIT;
} else {
ZFCP_LOG_DEBUG("nameserver look-up failed for "
"port 0x%016Lx\n", port->wwpn);
retval = ZFCP_ERP_FAILED;
}
} else {
ZFCP_LOG_DEBUG("port 0x%016Lx has d_id=0x%08x -> "
"trying open\n", port->wwpn, port->d_id);
retval = zfcp_erp_port_strategy_open_port(erp_action);
}
break;
case ZFCP_ERP_STEP_PORT_OPENING:
/* D_ID might have changed during open */
if (atomic_test_mask((ZFCP_STATUS_COMMON_OPEN |
ZFCP_STATUS_PORT_DID_DID),
&port->status)) {
ZFCP_LOG_DEBUG("port 0x%016Lx is open\n", port->wwpn);
retval = ZFCP_ERP_SUCCEEDED;
} else {
ZFCP_LOG_DEBUG("open failed for port 0x%016Lx\n",
port->wwpn);
retval = ZFCP_ERP_FAILED;
}
break;
default:
ZFCP_LOG_NORMAL("bug: unknown erp step 0x%08x\n",
erp_action->step);
retval = ZFCP_ERP_FAILED;
}
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_port *port = erp_action->port;
switch (erp_action->step) {
case ZFCP_ERP_STEP_UNINITIALIZED:
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_CLOSING:
ZFCP_LOG_DEBUG("port 0x%016Lx has d_id=0x%08x -> trying open\n",
port->wwpn, port->d_id);
retval = zfcp_erp_port_strategy_open_port(erp_action);
break;
case ZFCP_ERP_STEP_PORT_OPENING:
if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &port->status)) {
ZFCP_LOG_DEBUG("WKA port is open\n");
retval = ZFCP_ERP_SUCCEEDED;
} else {
ZFCP_LOG_DEBUG("open failed for WKA port\n");
retval = ZFCP_ERP_FAILED;
}
/* this is needed anyway (dont care for retval of wakeup) */
ZFCP_LOG_DEBUG("continue other open port operations\n");
zfcp_erp_port_strategy_open_nameserver_wakeup(erp_action);
break;
default:
ZFCP_LOG_NORMAL("bug: unknown erp step 0x%08x\n",
erp_action->step);
retval = ZFCP_ERP_FAILED;
}
return retval;
}
/*
* function:
*
* purpose: makes the erp thread continue with reopen (physical) port
* actions which have been paused until the name server port
* is opened (or failed)
*
* returns: 0 (a kind of void retval, its not used)
*/
static int
zfcp_erp_port_strategy_open_nameserver_wakeup(struct zfcp_erp_action
*ns_erp_action)
{
int retval = 0;
unsigned long flags;
struct zfcp_adapter *adapter = ns_erp_action->adapter;
struct zfcp_erp_action *erp_action, *tmp;
read_lock_irqsave(&adapter->erp_lock, flags);
list_for_each_entry_safe(erp_action, tmp, &adapter->erp_running_head,
list) {
debug_text_event(adapter->erp_dbf, 4, "p_pstnsw_n");
debug_event(adapter->erp_dbf, 4, &erp_action->port->wwpn,
sizeof (wwn_t));
if (erp_action->step == ZFCP_ERP_STEP_NAMESERVER_OPEN) {
debug_text_event(adapter->erp_dbf, 3, "p_pstnsw_w");
debug_event(adapter->erp_dbf, 3,
&erp_action->port->wwpn, sizeof (wwn_t));
if (atomic_test_mask(
ZFCP_STATUS_COMMON_ERP_FAILED,
&adapter->nameserver_port->status))
zfcp_erp_port_failed(erp_action->port);
zfcp_erp_action_ready(erp_action);
}
}
read_unlock_irqrestore(&adapter->erp_lock, flags);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
zfcp_erp_timeout_init(erp_action);
retval = zfcp_fsf_close_physical_port(erp_action);
if (retval == -ENOMEM) {
debug_text_event(adapter->erp_dbf, 5, "o_pfstc_nomem");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_NOMEM;
goto out;
}
erp_action->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
if (retval != 0) {
debug_text_event(adapter->erp_dbf, 5, "o_pfstc_cpf");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
/* could not send 'open', fail */
retval = ZFCP_ERP_FAILED;
goto out;
}
debug_text_event(adapter->erp_dbf, 6, "o_pfstc_cpok");
debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_CONTINUES;
out:
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
{
int retval = 0;
struct zfcp_adapter *adapter = port->adapter;
debug_text_event(adapter->erp_dbf, 5, "p_pstclst");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING |
ZFCP_STATUS_COMMON_CLOSING |
ZFCP_STATUS_COMMON_ACCESS_DENIED |
ZFCP_STATUS_PORT_DID_DID |
ZFCP_STATUS_PORT_PHYS_CLOSING |
ZFCP_STATUS_PORT_INVALID_WWPN,
&port->status);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
zfcp_erp_timeout_init(erp_action);
retval = zfcp_fsf_close_port(erp_action);
if (retval == -ENOMEM) {
debug_text_event(adapter->erp_dbf, 5, "p_pstc_nomem");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_NOMEM;
goto out;
}
erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
if (retval != 0) {
debug_text_event(adapter->erp_dbf, 5, "p_pstc_cpf");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
/* could not send 'close', fail */
retval = ZFCP_ERP_FAILED;
goto out;
}
debug_text_event(adapter->erp_dbf, 6, "p_pstc_cpok");
debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_CONTINUES;
out:
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
zfcp_erp_timeout_init(erp_action);
retval = zfcp_fsf_open_port(erp_action);
if (retval == -ENOMEM) {
debug_text_event(adapter->erp_dbf, 5, "p_psto_nomem");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_NOMEM;
goto out;
}
erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
if (retval != 0) {
debug_text_event(adapter->erp_dbf, 5, "p_psto_opf");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
/* could not send 'open', fail */
retval = ZFCP_ERP_FAILED;
goto out;
}
debug_text_event(adapter->erp_dbf, 6, "p_psto_opok");
debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_CONTINUES;
out:
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
zfcp_erp_timeout_init(erp_action);
retval = zfcp_ns_gid_pn_request(erp_action);
if (retval == -ENOMEM) {
debug_text_event(adapter->erp_dbf, 5, "p_pstn_nomem");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_NOMEM;
goto out;
}
erp_action->step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
if (retval != 0) {
debug_text_event(adapter->erp_dbf, 5, "p_pstn_ref");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
/* could not send nameserver request, fail */
retval = ZFCP_ERP_FAILED;
goto out;
}
debug_text_event(adapter->erp_dbf, 6, "p_pstn_reok");
debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t));
retval = ZFCP_ERP_CONTINUES;
out:
return retval;
}
/*
* function:
*
* purpose: this routine executes the 'Reopen Unit' action
* currently no retries
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_SUCCEEDED - action finished successfully
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
{
int retval = ZFCP_ERP_FAILED;
struct zfcp_unit *unit = erp_action->unit;
struct zfcp_adapter *adapter = erp_action->adapter;
switch (erp_action->step) {
/*
* FIXME:
* the ULP spec. begs for waiting for oustanding commands
*/
case ZFCP_ERP_STEP_UNINITIALIZED:
zfcp_erp_unit_strategy_clearstati(unit);
if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
ZFCP_LOG_DEBUG("unit 0x%016Lx is open -> "
"trying close\n", unit->fcp_lun);
retval = zfcp_erp_unit_strategy_close(erp_action);
break;
}
/* else it's already closed, fall through */
case ZFCP_ERP_STEP_UNIT_CLOSING:
if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
ZFCP_LOG_DEBUG("close failed for unit 0x%016Lx\n",
unit->fcp_lun);
retval = ZFCP_ERP_FAILED;
} else {
if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
retval = ZFCP_ERP_EXIT;
else {
ZFCP_LOG_DEBUG("unit 0x%016Lx is not open -> "
"trying open\n", unit->fcp_lun);
retval =
zfcp_erp_unit_strategy_open(erp_action);
}
}
break;
case ZFCP_ERP_STEP_UNIT_OPENING:
if (atomic_test_mask(ZFCP_STATUS_COMMON_OPEN, &unit->status)) {
ZFCP_LOG_DEBUG("unit 0x%016Lx is open\n",
unit->fcp_lun);
retval = ZFCP_ERP_SUCCEEDED;
} else {
ZFCP_LOG_DEBUG("open failed for unit 0x%016Lx\n",
unit->fcp_lun);
retval = ZFCP_ERP_FAILED;
}
break;
}
debug_text_event(adapter->erp_dbf, 3, "u_ust/ret");
debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof (fcp_lun_t));
debug_event(adapter->erp_dbf, 3, &erp_action->action, sizeof (int));
debug_event(adapter->erp_dbf, 3, &retval, sizeof (int));
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
{
int retval = 0;
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 5, "u_ustclst");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
atomic_clear_mask(ZFCP_STATUS_COMMON_OPENING |
ZFCP_STATUS_COMMON_CLOSING |
ZFCP_STATUS_COMMON_ACCESS_DENIED |
ZFCP_STATUS_UNIT_SHARED |
ZFCP_STATUS_UNIT_READONLY,
&unit->status);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_unit *unit = erp_action->unit;
zfcp_erp_timeout_init(erp_action);
retval = zfcp_fsf_close_unit(erp_action);
if (retval == -ENOMEM) {
debug_text_event(adapter->erp_dbf, 5, "u_ustc_nomem");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
sizeof (fcp_lun_t));
retval = ZFCP_ERP_NOMEM;
goto out;
}
erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
if (retval != 0) {
debug_text_event(adapter->erp_dbf, 5, "u_ustc_cuf");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
sizeof (fcp_lun_t));
/* could not send 'close', fail */
retval = ZFCP_ERP_FAILED;
goto out;
}
debug_text_event(adapter->erp_dbf, 6, "u_ustc_cuok");
debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
retval = ZFCP_ERP_CONTINUES;
out:
return retval;
}
/*
* function:
*
* purpose:
*
* returns: ZFCP_ERP_CONTINUES - action continues (asynchronously)
* ZFCP_ERP_FAILED - action finished unsuccessfully
*/
static int
zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
{
int retval;
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_unit *unit = erp_action->unit;
zfcp_erp_timeout_init(erp_action);
retval = zfcp_fsf_open_unit(erp_action);
if (retval == -ENOMEM) {
debug_text_event(adapter->erp_dbf, 5, "u_usto_nomem");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
sizeof (fcp_lun_t));
retval = ZFCP_ERP_NOMEM;
goto out;
}
erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
if (retval != 0) {
debug_text_event(adapter->erp_dbf, 5, "u_usto_ouf");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun,
sizeof (fcp_lun_t));
/* could not send 'open', fail */
retval = ZFCP_ERP_FAILED;
goto out;
}
debug_text_event(adapter->erp_dbf, 6, "u_usto_ouok");
debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t));
retval = ZFCP_ERP_CONTINUES;
out:
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static inline void
zfcp_erp_timeout_init(struct zfcp_erp_action *erp_action)
{
init_timer(&erp_action->timer);
erp_action->timer.function = zfcp_erp_timeout_handler;
erp_action->timer.data = (unsigned long) erp_action;
/* jiffies will be added in zfcp_fsf_req_send */
erp_action->timer.expires = ZFCP_ERP_FSFREQ_TIMEOUT;
}
/*
* function:
*
* purpose: enqueue the specified error recovery action, if needed
*
* returns:
*/
static int
zfcp_erp_action_enqueue(int action,
struct zfcp_adapter *adapter,
struct zfcp_port *port, struct zfcp_unit *unit)
{
int retval = 1;
struct zfcp_erp_action *erp_action = NULL;
int stronger_action = 0;
u32 status = 0;
/*
* We need some rules here which check whether we really need
* this action or whether we should just drop it.
* E.g. if there is a unfinished 'Reopen Port' request then we drop a
* 'Reopen Unit' request for an associated unit since we can't
* satisfy this request now. A 'Reopen Port' action will trigger
* 'Reopen Unit' actions when it completes.
* Thus, there are only actions in the queue which can immediately be
* executed. This makes the processing of the action queue more
* efficient.
*/
if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP,
&adapter->status))
return -EIO;
debug_event(adapter->erp_dbf, 4, &action, sizeof (int));
/* check whether we really need this */
switch (action) {
case ZFCP_ERP_ACTION_REOPEN_UNIT:
if (atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status)) {
debug_text_event(adapter->erp_dbf, 4, "u_actenq_drp");
debug_event(adapter->erp_dbf, 4, &port->wwpn,
sizeof (wwn_t));
debug_event(adapter->erp_dbf, 4, &unit->fcp_lun,
sizeof (fcp_lun_t));
goto out;
}
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_RUNNING, &port->status) ||
atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) {
goto out;
}
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status)) {
stronger_action = ZFCP_ERP_ACTION_REOPEN_PORT;
unit = NULL;
}
/* fall through !!! */
case ZFCP_ERP_ACTION_REOPEN_PORT:
if (atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status)) {
debug_text_event(adapter->erp_dbf, 4, "p_actenq_drp");
debug_event(adapter->erp_dbf, 4, &port->wwpn,
sizeof (wwn_t));
goto out;
}
/* fall through !!! */
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
if (atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status)
&& port->erp_action.action ==
ZFCP_ERP_ACTION_REOPEN_PORT_FORCED) {
debug_text_event(adapter->erp_dbf, 4, "pf_actenq_drp");
debug_event(adapter->erp_dbf, 4, &port->wwpn,
sizeof (wwn_t));
goto out;
}
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_RUNNING, &adapter->status) ||
atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) {
goto out;
}
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status)) {
stronger_action = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
port = NULL;
}
/* fall through !!! */
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (atomic_test_mask
(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status)) {
debug_text_event(adapter->erp_dbf, 4, "a_actenq_drp");
goto out;
}
break;
default:
debug_text_exception(adapter->erp_dbf, 1, "a_actenq_bug");
debug_event(adapter->erp_dbf, 1, &action, sizeof (int));
ZFCP_LOG_NORMAL("bug: unknown erp action requested "
"on adapter %s (action=%d)\n",
zfcp_get_busid_by_adapter(adapter), action);
goto out;
}
/* check whether we need something stronger first */
if (stronger_action) {
debug_text_event(adapter->erp_dbf, 4, "a_actenq_str");
debug_event(adapter->erp_dbf, 4, &stronger_action,
sizeof (int));
ZFCP_LOG_DEBUG("stronger erp action %d needed before "
"erp action %d on adapter %s\n",
stronger_action, action,
zfcp_get_busid_by_adapter(adapter));
action = stronger_action;
}
/* mark adapter to have some error recovery pending */
atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
/* setup error recovery action */
switch (action) {
case ZFCP_ERP_ACTION_REOPEN_UNIT:
zfcp_unit_get(unit);
atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
erp_action = &unit->erp_action;
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_RUNNING, &unit->status))
status = ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
zfcp_port_get(port);
zfcp_erp_action_dismiss_port(port);
atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
erp_action = &port->erp_action;
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_RUNNING, &port->status))
status = ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
zfcp_adapter_get(adapter);
zfcp_erp_action_dismiss_adapter(adapter);
atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
erp_action = &adapter->erp_action;
if (!atomic_test_mask
(ZFCP_STATUS_COMMON_RUNNING, &adapter->status))
status = ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
}
debug_text_event(adapter->erp_dbf, 4, "a_actenq");
memset(erp_action, 0, sizeof (struct zfcp_erp_action));
erp_action->adapter = adapter;
erp_action->port = port;
erp_action->unit = unit;
erp_action->action = action;
erp_action->status = status;
++adapter->erp_total_count;
/* finally put it into 'ready' queue and kick erp thread */
list_add(&erp_action->list, &adapter->erp_ready_head);
up(&adapter->erp_ready_sem);
retval = 0;
out:
return retval;
}
/*
* function:
*
* purpose:
*
* returns:
*/
static int
zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
{
int retval = 0;
struct zfcp_adapter *adapter = erp_action->adapter;
--adapter->erp_total_count;
if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
--adapter->erp_low_mem_count;
erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
}
debug_text_event(adapter->erp_dbf, 4, "a_actdeq");
debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int));
list_del(&erp_action->list);
switch (erp_action->action) {
case ZFCP_ERP_ACTION_REOPEN_UNIT:
atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
&erp_action->unit->status);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
case ZFCP_ERP_ACTION_REOPEN_PORT:
atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
&erp_action->port->status);
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
&erp_action->adapter->status);
break;
default:
/* bug */
break;
}
return retval;
}
/**
* zfcp_erp_action_cleanup
*
* Register unit with scsi stack if appropiate and fix reference counts.
* Note: Temporary units are not registered with scsi stack.
*/
static void
zfcp_erp_action_cleanup(int action, struct zfcp_adapter *adapter,
struct zfcp_port *port, struct zfcp_unit *unit,
int result)
{
switch (action) {
case ZFCP_ERP_ACTION_REOPEN_UNIT:
if ((result == ZFCP_ERP_SUCCEEDED)
&& (!atomic_test_mask(ZFCP_STATUS_UNIT_TEMPORARY,
&unit->status))
&& (!unit->device))
scsi_add_device(unit->port->adapter->scsi_host, 0,
unit->port->scsi_id, unit->scsi_lun);
zfcp_unit_put(unit);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
case ZFCP_ERP_ACTION_REOPEN_PORT:
zfcp_port_put(port);
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
zfcp_adapter_put(adapter);
break;
default:
break;
}
}
/*
* function:
*
* purpose:
*
* returns: FIXME
*/
static int
zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
{
int retval = 0;
struct zfcp_port *port;
debug_text_event(adapter->erp_dbf, 5, "a_actab");
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status))
zfcp_erp_action_dismiss(&adapter->erp_action);
else
list_for_each_entry(port, &adapter->port_list_head, list)
zfcp_erp_action_dismiss_port(port);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: FIXME
*/
static int
zfcp_erp_action_dismiss_port(struct zfcp_port *port)
{
int retval = 0;
struct zfcp_unit *unit;
struct zfcp_adapter *adapter = port->adapter;
debug_text_event(adapter->erp_dbf, 5, "p_actab");
debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t));
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status))
zfcp_erp_action_dismiss(&port->erp_action);
else
list_for_each_entry(unit, &port->unit_list_head, list)
zfcp_erp_action_dismiss_unit(unit);
return retval;
}
/*
* function:
*
* purpose:
*
* returns: FIXME
*/
static int
zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
{
int retval = 0;
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 5, "u_actab");
debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t));
if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status))
zfcp_erp_action_dismiss(&unit->erp_action);
return retval;
}
/*
* function:
*
* purpose: moves erp_action to 'erp running list'
*
* returns:
*/
static inline void
zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
{
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 6, "a_toru");
debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
}
/*
* function:
*
* purpose: moves erp_action to 'erp ready list'
*
* returns:
*/
static inline void
zfcp_erp_action_to_ready(struct zfcp_erp_action *erp_action)
{
struct zfcp_adapter *adapter = erp_action->adapter;
debug_text_event(adapter->erp_dbf, 6, "a_tore");
debug_event(adapter->erp_dbf, 6, &erp_action->action, sizeof (int));
list_move(&erp_action->list, &erp_action->adapter->erp_ready_head);
}
/*
* function: zfcp_erp_port_access_denied
*
* purpose:
*/
void
zfcp_erp_port_access_denied(struct zfcp_port *port)
{
struct zfcp_adapter *adapter = port->adapter;
unsigned long flags;
debug_text_event(adapter->erp_dbf, 3, "p_access_block");
debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
read_lock_irqsave(&zfcp_data.config_lock, flags);
zfcp_erp_modify_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED |
ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
}
/*
* function: zfcp_erp_unit_access_denied
*
* purpose:
*/
void
zfcp_erp_unit_access_denied(struct zfcp_unit *unit)
{
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 3, "u_access_block");
debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_ERP_FAILED |
ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
}
/*
* function: zfcp_erp_adapter_access_changed
*
* purpose:
*/
void
zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter)
{
struct zfcp_port *port;
unsigned long flags;
debug_text_event(adapter->erp_dbf, 3, "a_access_unblock");
debug_event(adapter->erp_dbf, 3, &adapter->name, 8);
zfcp_erp_port_access_changed(adapter->nameserver_port);
read_lock_irqsave(&zfcp_data.config_lock, flags);
list_for_each_entry(port, &adapter->port_list_head, list)
if (port != adapter->nameserver_port)
zfcp_erp_port_access_changed(port);
read_unlock_irqrestore(&zfcp_data.config_lock, flags);
}
/*
* function: zfcp_erp_port_access_changed
*
* purpose:
*/
void
zfcp_erp_port_access_changed(struct zfcp_port *port)
{
struct zfcp_adapter *adapter = port->adapter;
struct zfcp_unit *unit;
debug_text_event(adapter->erp_dbf, 3, "p_access_unblock");
debug_event(adapter->erp_dbf, 3, &port->wwpn, sizeof(wwn_t));
if (!atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
&port->status)) {
if (!atomic_test_mask(ZFCP_STATUS_PORT_WKA, &port->status))
list_for_each_entry(unit, &port->unit_list_head, list)
zfcp_erp_unit_access_changed(unit);
return;
}
ZFCP_LOG_NORMAL("reopen of port 0x%016Lx on adapter %s "
"(due to ACT update)\n",
port->wwpn, zfcp_get_busid_by_adapter(adapter));
if (zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
ZFCP_LOG_NORMAL("failed reopen of port"
"(adapter %s, wwpn=0x%016Lx)\n",
zfcp_get_busid_by_adapter(adapter), port->wwpn);
}
/*
* function: zfcp_erp_unit_access_changed
*
* purpose:
*/
void
zfcp_erp_unit_access_changed(struct zfcp_unit *unit)
{
struct zfcp_adapter *adapter = unit->port->adapter;
debug_text_event(adapter->erp_dbf, 3, "u_access_unblock");
debug_event(adapter->erp_dbf, 3, &unit->fcp_lun, sizeof(fcp_lun_t));
if (!atomic_test_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status))
return;
ZFCP_LOG_NORMAL("reopen of unit 0x%016Lx on port 0x%016Lx "
" on adapter %s (due to ACT update)\n",
unit->fcp_lun, unit->port->wwpn,
zfcp_get_busid_by_adapter(adapter));
if (zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
ZFCP_LOG_NORMAL("failed reopen of unit (adapter %s, "
"wwpn=0x%016Lx, fcp_lun=0x%016Lx)\n",
zfcp_get_busid_by_adapter(adapter),
unit->port->wwpn, unit->fcp_lun);
}
#undef ZFCP_LOG_AREA