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zfcp_erp.c
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zfcp_erp.c
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/*
* zfcp device driver
*
* Error Recovery Procedures (ERP).
*
* Copyright IBM Corp. 2002, 2010
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kthread.h>
#include "zfcp_ext.h"
#include "zfcp_reqlist.h"
#define ZFCP_MAX_ERPS 3
enum zfcp_erp_act_flags {
ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
ZFCP_STATUS_ERP_NO_REF = 0x00800000,
};
enum zfcp_erp_steps {
ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
};
enum zfcp_erp_act_type {
ZFCP_ERP_ACTION_REOPEN_LUN = 1,
ZFCP_ERP_ACTION_REOPEN_PORT = 2,
ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
};
enum zfcp_erp_act_state {
ZFCP_ERP_ACTION_RUNNING = 1,
ZFCP_ERP_ACTION_READY = 2,
};
enum zfcp_erp_act_result {
ZFCP_ERP_SUCCEEDED = 0,
ZFCP_ERP_FAILED = 1,
ZFCP_ERP_CONTINUES = 2,
ZFCP_ERP_EXIT = 3,
ZFCP_ERP_DISMISSED = 4,
ZFCP_ERP_NOMEM = 5,
};
static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
{
zfcp_erp_clear_adapter_status(adapter,
ZFCP_STATUS_COMMON_UNBLOCKED | mask);
}
static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
{
struct zfcp_erp_action *curr_act;
list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
if (act == curr_act)
return ZFCP_ERP_ACTION_RUNNING;
return 0;
}
static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
list_move(&act->list, &act->adapter->erp_ready_head);
zfcp_dbf_rec_run("erardy1", act);
wake_up(&adapter->erp_ready_wq);
zfcp_dbf_rec_run("erardy2", act);
}
static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
{
act->status |= ZFCP_STATUS_ERP_DISMISSED;
if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
zfcp_erp_action_ready(act);
}
static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
}
static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
{
struct scsi_device *sdev;
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
zfcp_erp_action_dismiss(&port->erp_action);
else {
spin_lock(port->adapter->scsi_host->host_lock);
__shost_for_each_device(sdev, port->adapter->scsi_host)
if (sdev_to_zfcp(sdev)->port == port)
zfcp_erp_action_dismiss_lun(sdev);
spin_unlock(port->adapter->scsi_host->host_lock);
}
}
static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
{
struct zfcp_port *port;
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
zfcp_erp_action_dismiss(&adapter->erp_action);
else {
read_lock(&adapter->port_list_lock);
list_for_each_entry(port, &adapter->port_list, list)
zfcp_erp_action_dismiss_port(port);
read_unlock(&adapter->port_list_lock);
}
}
static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct scsi_device *sdev)
{
int need = want;
int l_status, p_status, a_status;
struct zfcp_scsi_dev *zfcp_sdev;
switch (want) {
case ZFCP_ERP_ACTION_REOPEN_LUN:
zfcp_sdev = sdev_to_zfcp(sdev);
l_status = atomic_read(&zfcp_sdev->status);
if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
return 0;
p_status = atomic_read(&port->status);
if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
return 0;
if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
need = ZFCP_ERP_ACTION_REOPEN_PORT;
/* fall through */
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
p_status = atomic_read(&port->status);
if (!(p_status & ZFCP_STATUS_COMMON_OPEN))
need = ZFCP_ERP_ACTION_REOPEN_PORT;
/* fall through */
case ZFCP_ERP_ACTION_REOPEN_PORT:
p_status = atomic_read(&port->status);
if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
return 0;
a_status = atomic_read(&adapter->status);
if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
return 0;
if (p_status & ZFCP_STATUS_COMMON_NOESC)
return need;
if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
/* fall through */
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
a_status = atomic_read(&adapter->status);
if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
return 0;
if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
!(a_status & ZFCP_STATUS_COMMON_OPEN))
return 0; /* shutdown requested for closed adapter */
}
return need;
}
static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct scsi_device *sdev)
{
struct zfcp_erp_action *erp_action;
struct zfcp_scsi_dev *zfcp_sdev;
switch (need) {
case ZFCP_ERP_ACTION_REOPEN_LUN:
zfcp_sdev = sdev_to_zfcp(sdev);
if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
if (scsi_device_get(sdev))
return NULL;
atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
&zfcp_sdev->status);
erp_action = &zfcp_sdev->erp_action;
memset(erp_action, 0, sizeof(struct zfcp_erp_action));
erp_action->port = port;
erp_action->sdev = sdev;
if (!(atomic_read(&zfcp_sdev->status) &
ZFCP_STATUS_COMMON_RUNNING))
act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
if (!get_device(&port->dev))
return NULL;
zfcp_erp_action_dismiss_port(port);
atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
erp_action = &port->erp_action;
memset(erp_action, 0, sizeof(struct zfcp_erp_action));
erp_action->port = port;
if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
kref_get(&adapter->ref);
zfcp_erp_action_dismiss_adapter(adapter);
atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
erp_action = &adapter->erp_action;
memset(erp_action, 0, sizeof(struct zfcp_erp_action));
if (!(atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_RUNNING))
act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
default:
return NULL;
}
erp_action->adapter = adapter;
erp_action->action = need;
erp_action->status = act_status;
return erp_action;
}
static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct scsi_device *sdev,
char *id, u32 act_status)
{
int retval = 1, need;
struct zfcp_erp_action *act;
if (!adapter->erp_thread)
return -EIO;
need = zfcp_erp_required_act(want, adapter, port, sdev);
if (!need)
goto out;
act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
if (!act)
goto out;
atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
++adapter->erp_total_count;
list_add_tail(&act->list, &adapter->erp_ready_head);
wake_up(&adapter->erp_ready_wq);
retval = 0;
out:
zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need);
return retval;
}
static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
int clear_mask, char *id)
{
zfcp_erp_adapter_block(adapter, clear_mask);
zfcp_scsi_schedule_rports_block(adapter);
/* ensure propagation of failed status to new devices */
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
zfcp_erp_set_adapter_status(adapter,
ZFCP_STATUS_COMMON_ERP_FAILED);
return -EIO;
}
return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
adapter, NULL, NULL, id, 0);
}
/**
* zfcp_erp_adapter_reopen - Reopen adapter.
* @adapter: Adapter to reopen.
* @clear: Status flags to clear.
* @id: Id for debug trace event.
*/
void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id)
{
unsigned long flags;
zfcp_erp_adapter_block(adapter, clear);
zfcp_scsi_schedule_rports_block(adapter);
write_lock_irqsave(&adapter->erp_lock, flags);
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
zfcp_erp_set_adapter_status(adapter,
ZFCP_STATUS_COMMON_ERP_FAILED);
else
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
NULL, NULL, id, 0);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
/**
* zfcp_erp_adapter_shutdown - Shutdown adapter.
* @adapter: Adapter to shut down.
* @clear: Status flags to clear.
* @id: Id for debug trace event.
*/
void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
char *id)
{
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
zfcp_erp_adapter_reopen(adapter, clear | flags, id);
}
/**
* zfcp_erp_port_shutdown - Shutdown port
* @port: Port to shut down.
* @clear: Status flags to clear.
* @id: Id for debug trace event.
*/
void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id)
{
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
zfcp_erp_port_reopen(port, clear | flags, id);
}
static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
{
zfcp_erp_clear_port_status(port,
ZFCP_STATUS_COMMON_UNBLOCKED | clear);
}
static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
char *id)
{
zfcp_erp_port_block(port, clear);
zfcp_scsi_schedule_rport_block(port);
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
return;
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
port->adapter, port, NULL, id, 0);
}
/**
* zfcp_erp_port_forced_reopen - Forced close of port and open again
* @port: Port to force close and to reopen.
* @clear: Status flags to clear.
* @id: Id for debug trace event.
*/
void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id)
{
unsigned long flags;
struct zfcp_adapter *adapter = port->adapter;
write_lock_irqsave(&adapter->erp_lock, flags);
_zfcp_erp_port_forced_reopen(port, clear, id);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
{
zfcp_erp_port_block(port, clear);
zfcp_scsi_schedule_rport_block(port);
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
/* ensure propagation of failed status to new devices */
zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
return -EIO;
}
return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
port->adapter, port, NULL, id, 0);
}
/**
* zfcp_erp_port_reopen - trigger remote port recovery
* @port: port to recover
* @clear_mask: flags in port status to be cleared
* @id: Id for debug trace event.
*
* Returns 0 if recovery has been triggered, < 0 if not.
*/
int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
{
int retval;
unsigned long flags;
struct zfcp_adapter *adapter = port->adapter;
write_lock_irqsave(&adapter->erp_lock, flags);
retval = _zfcp_erp_port_reopen(port, clear, id);
write_unlock_irqrestore(&adapter->erp_lock, flags);
return retval;
}
static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
{
zfcp_erp_clear_lun_status(sdev,
ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask);
}
static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
u32 act_status)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
zfcp_erp_lun_block(sdev, clear);
if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
return;
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
zfcp_sdev->port, sdev, id, act_status);
}
/**
* zfcp_erp_lun_reopen - initiate reopen of a LUN
* @sdev: SCSI device / LUN to be reopened
* @clear_mask: specifies flags in LUN status to be cleared
* @id: Id for debug trace event.
*
* Return: 0 on success, < 0 on error
*/
void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id)
{
unsigned long flags;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_port *port = zfcp_sdev->port;
struct zfcp_adapter *adapter = port->adapter;
write_lock_irqsave(&adapter->erp_lock, flags);
_zfcp_erp_lun_reopen(sdev, clear, id, 0);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
/**
* zfcp_erp_lun_shutdown - Shutdown LUN
* @sdev: SCSI device / LUN to shut down.
* @clear: Status flags to clear.
* @id: Id for debug trace event.
*/
void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id)
{
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
zfcp_erp_lun_reopen(sdev, clear | flags, id);
}
/**
* zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion
* @sdev: SCSI device / LUN to shut down.
* @id: Id for debug trace event.
*
* Do not acquire a reference for the LUN when creating the ERP
* action. It is safe, because this function waits for the ERP to
* complete first. This allows to shutdown the LUN, even when the SCSI
* device is in the state SDEV_DEL when scsi_device_get will fail.
*/
void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
{
unsigned long flags;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_port *port = zfcp_sdev->port;
struct zfcp_adapter *adapter = port->adapter;
int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
write_lock_irqsave(&adapter->erp_lock, flags);
_zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
write_unlock_irqrestore(&adapter->erp_lock, flags);
zfcp_erp_wait(adapter);
}
static int status_change_set(unsigned long mask, atomic_t *status)
{
return (atomic_read(status) ^ mask) & mask;
}
static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
{
if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
}
static void zfcp_erp_port_unblock(struct zfcp_port *port)
{
if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
zfcp_dbf_rec_run("erpubl1", &port->erp_action);
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
}
static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
}
static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
{
list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
zfcp_dbf_rec_run("erator1", erp_action);
}
static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
struct zfcp_fsf_req *req;
if (!act->fsf_req_id)
return;
spin_lock(&adapter->req_list->lock);
req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
if (req && req->erp_action == act) {
if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
ZFCP_STATUS_ERP_TIMEDOUT)) {
req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
zfcp_dbf_rec_run("erscf_1", act);
req->erp_action = NULL;
}
if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
zfcp_dbf_rec_run("erscf_2", act);
if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
act->fsf_req_id = 0;
} else
act->fsf_req_id = 0;
spin_unlock(&adapter->req_list->lock);
}
/**
* zfcp_erp_notify - Trigger ERP action.
* @erp_action: ERP action to continue.
* @set_mask: ERP action status flags to set.
*/
void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
{
struct zfcp_adapter *adapter = erp_action->adapter;
unsigned long flags;
write_lock_irqsave(&adapter->erp_lock, flags);
if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
erp_action->status |= set_mask;
zfcp_erp_action_ready(erp_action);
}
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
/**
* zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
* @data: ERP action (from timer data)
*/
void zfcp_erp_timeout_handler(unsigned long data)
{
struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
}
static void zfcp_erp_memwait_handler(unsigned long data)
{
zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
}
static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
{
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 + HZ;
add_timer(&erp_action->timer);
}
static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
int clear, char *id)
{
struct zfcp_port *port;
read_lock(&adapter->port_list_lock);
list_for_each_entry(port, &adapter->port_list, list)
_zfcp_erp_port_reopen(port, clear, id);
read_unlock(&adapter->port_list_lock);
}
static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
char *id)
{
struct scsi_device *sdev;
spin_lock(port->adapter->scsi_host->host_lock);
__shost_for_each_device(sdev, port->adapter->scsi_host)
if (sdev_to_zfcp(sdev)->port == port)
_zfcp_erp_lun_reopen(sdev, clear, id, 0);
spin_unlock(port->adapter->scsi_host->host_lock);
}
static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
{
switch (act->action) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
_zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1");
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
_zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2");
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
_zfcp_erp_port_reopen(act->port, 0, "ersff_3");
break;
case ZFCP_ERP_ACTION_REOPEN_LUN:
_zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0);
break;
}
}
static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
{
switch (act->action) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
_zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1");
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
_zfcp_erp_port_reopen(act->port, 0, "ersfs_2");
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
_zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3");
break;
}
}
static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
{
unsigned long flags;
read_lock_irqsave(&adapter->erp_lock, flags);
if (list_empty(&adapter->erp_ready_head) &&
list_empty(&adapter->erp_running_head)) {
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
&adapter->status);
wake_up(&adapter->erp_done_wqh);
}
read_unlock_irqrestore(&adapter->erp_lock, flags);
}
static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
{
struct zfcp_port *port;
port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
adapter->peer_d_id);
if (IS_ERR(port)) /* error or port already attached */
return;
_zfcp_erp_port_reopen(port, 0, "ereptp1");
}
static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
{
int retries;
int sleep = 1;
struct zfcp_adapter *adapter = erp_action->adapter;
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
for (retries = 7; retries; retries--) {
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status);
write_lock_irq(&adapter->erp_lock);
zfcp_erp_action_to_running(erp_action);
write_unlock_irq(&adapter->erp_lock);
if (zfcp_fsf_exchange_config_data(erp_action)) {
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status);
return ZFCP_ERP_FAILED;
}
wait_event(adapter->erp_ready_wq,
!list_empty(&adapter->erp_ready_head));
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
break;
if (!(atomic_read(&adapter->status) &
ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
break;
ssleep(sleep);
sleep *= 2;
}
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status);
if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
return ZFCP_ERP_FAILED;
if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
zfcp_erp_enqueue_ptp_port(adapter);
return ZFCP_ERP_SUCCEEDED;
}
static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
{
int ret;
struct zfcp_adapter *adapter = act->adapter;
write_lock_irq(&adapter->erp_lock);
zfcp_erp_action_to_running(act);
write_unlock_irq(&adapter->erp_lock);
ret = zfcp_fsf_exchange_port_data(act);
if (ret == -EOPNOTSUPP)
return ZFCP_ERP_SUCCEEDED;
if (ret)
return ZFCP_ERP_FAILED;
zfcp_dbf_rec_run("erasox1", act);
wait_event(adapter->erp_ready_wq,
!list_empty(&adapter->erp_ready_head));
zfcp_dbf_rec_run("erasox2", act);
if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
return ZFCP_ERP_FAILED;
return ZFCP_ERP_SUCCEEDED;
}
static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
{
if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
return ZFCP_ERP_FAILED;
if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
return ZFCP_ERP_FAILED;
if (mempool_resize(act->adapter->pool.sr_data,
act->adapter->stat_read_buf_num, GFP_KERNEL))
return ZFCP_ERP_FAILED;
if (mempool_resize(act->adapter->pool.status_read_req,
act->adapter->stat_read_buf_num, GFP_KERNEL))
return ZFCP_ERP_FAILED;
atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
if (zfcp_status_read_refill(act->adapter))
return ZFCP_ERP_FAILED;
return ZFCP_ERP_SUCCEEDED;
}
static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
/* close queues to ensure that buffers are not accessed by adapter */
zfcp_qdio_close(adapter->qdio);
zfcp_fsf_req_dismiss_all(adapter);
adapter->fsf_req_seq_no = 0;
zfcp_fc_wka_ports_force_offline(adapter->gs);
/* all ports and LUNs are closed */
zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN);
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
}
static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
if (zfcp_qdio_open(adapter->qdio)) {
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
&adapter->status);
return ZFCP_ERP_FAILED;
}
if (zfcp_erp_adapter_strategy_open_fsf(act)) {
zfcp_erp_adapter_strategy_close(act);
return ZFCP_ERP_FAILED;
}
atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
return ZFCP_ERP_SUCCEEDED;
}
static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
zfcp_erp_adapter_strategy_close(act);
if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
return ZFCP_ERP_EXIT;
}
if (zfcp_erp_adapter_strategy_open(act)) {
ssleep(8);
return ZFCP_ERP_FAILED;
}
return ZFCP_ERP_SUCCEEDED;
}
static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
{
int retval;
retval = zfcp_fsf_close_physical_port(act);
if (retval == -ENOMEM)
return ZFCP_ERP_NOMEM;
act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
if (retval)
return ZFCP_ERP_FAILED;
return ZFCP_ERP_CONTINUES;
}
static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
{
atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
}
static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
{
struct zfcp_port *port = erp_action->port;
int status = atomic_read(&port->status);
switch (erp_action->step) {
case ZFCP_ERP_STEP_UNINITIALIZED:
zfcp_erp_port_strategy_clearstati(port);
if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
(status & ZFCP_STATUS_COMMON_OPEN))
return zfcp_erp_port_forced_strategy_close(erp_action);
else
return ZFCP_ERP_FAILED;
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
return ZFCP_ERP_SUCCEEDED;
}
return ZFCP_ERP_FAILED;
}
static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
{
int retval;
retval = zfcp_fsf_close_port(erp_action);
if (retval == -ENOMEM)
return ZFCP_ERP_NOMEM;
erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
if (retval)
return ZFCP_ERP_FAILED;
return ZFCP_ERP_CONTINUES;
}
static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
{
int retval;
retval = zfcp_fsf_open_port(erp_action);
if (retval == -ENOMEM)
return ZFCP_ERP_NOMEM;
erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
if (retval)
return ZFCP_ERP_FAILED;
return ZFCP_ERP_CONTINUES;
}
static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
struct zfcp_port *port = act->port;
if (port->wwpn != adapter->peer_wwpn) {
zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
return ZFCP_ERP_FAILED;
}
port->d_id = adapter->peer_d_id;
return zfcp_erp_port_strategy_open_port(act);
}
static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
struct zfcp_port *port = act->port;
int p_status = atomic_read(&port->status);
switch (act->step) {
case ZFCP_ERP_STEP_UNINITIALIZED:
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_CLOSING:
if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
return zfcp_erp_open_ptp_port(act);
if (!port->d_id) {
zfcp_fc_trigger_did_lookup(port);
return ZFCP_ERP_EXIT;
}
return zfcp_erp_port_strategy_open_port(act);
case ZFCP_ERP_STEP_PORT_OPENING:
/* D_ID might have changed during open */
if (p_status & ZFCP_STATUS_COMMON_OPEN) {
if (!port->d_id) {
zfcp_fc_trigger_did_lookup(port);
return ZFCP_ERP_EXIT;
}
return ZFCP_ERP_SUCCEEDED;
}
if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
port->d_id = 0;
return ZFCP_ERP_FAILED;
}
/* fall through otherwise */
}
return ZFCP_ERP_FAILED;
}
static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
{
struct zfcp_port *port = erp_action->port;
int p_status = atomic_read(&port->status);
if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
!(p_status & ZFCP_STATUS_COMMON_OPEN))
goto close_init_done;
switch (erp_action->step) {
case ZFCP_ERP_STEP_UNINITIALIZED:
zfcp_erp_port_strategy_clearstati(port);
if (p_status & ZFCP_STATUS_COMMON_OPEN)
return zfcp_erp_port_strategy_close(erp_action);
break;
case ZFCP_ERP_STEP_PORT_CLOSING:
if (p_status & ZFCP_STATUS_COMMON_OPEN)
return ZFCP_ERP_FAILED;
break;
}
close_init_done:
if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
return ZFCP_ERP_EXIT;
return zfcp_erp_port_strategy_open_common(erp_action);
}
static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
&zfcp_sdev->status);
}
static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action)
{
int retval = zfcp_fsf_close_lun(erp_action);
if (retval == -ENOMEM)
return ZFCP_ERP_NOMEM;
erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING;
if (retval)
return ZFCP_ERP_FAILED;
return ZFCP_ERP_CONTINUES;
}
static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action)
{
int retval = zfcp_fsf_open_lun(erp_action);
if (retval == -ENOMEM)
return ZFCP_ERP_NOMEM;
erp_action->step = ZFCP_ERP_STEP_LUN_OPENING;
if (retval)
return ZFCP_ERP_FAILED;
return ZFCP_ERP_CONTINUES;
}
static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action)
{
struct scsi_device *sdev = erp_action->sdev;
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
switch (erp_action->step) {
case ZFCP_ERP_STEP_UNINITIALIZED:
zfcp_erp_lun_strategy_clearstati(sdev);
if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
return zfcp_erp_lun_strategy_close(erp_action);
/* already closed, fall through */
case ZFCP_ERP_STEP_LUN_CLOSING:
if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
return ZFCP_ERP_FAILED;
if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
return ZFCP_ERP_EXIT;
return zfcp_erp_lun_strategy_open(erp_action);