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android-kvm / linux / 56cec28dc4da396d6032c59ae9614c5a6ae7d7a8 / . / drivers / s390 / scsi / zfcp_erp.c
blob: 78d52a4c55f526fb085ff9f0599da9e71a6b5aab [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* zfcp device driver
*
* Error Recovery Procedures (ERP).
*
* Copyright IBM Corp. 2002, 2020
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kthread.h>
#include <linux/bug.h>
#include "zfcp_ext.h"
#include "zfcp_reqlist.h"
#include "zfcp_diag.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_DISMISSED = 0x00200000,
ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
ZFCP_STATUS_ERP_NO_REF = 0x00800000,
};
/*
* Eyecatcher pseudo flag to bitwise or-combine with enum zfcp_erp_act_type.
* Used to indicate that an ERP action could not be set up despite a detected
* need for some recovery.
*/
#define ZFCP_ERP_ACTION_NONE 0xc0
/*
* Eyecatcher pseudo flag to bitwise or-combine with enum zfcp_erp_act_type.
* Used to indicate that ERP not needed because the object has
* ZFCP_STATUS_COMMON_ERP_FAILED.
*/
#define ZFCP_ERP_ACTION_FAILED 0xe0
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 bool zfcp_erp_action_is_running(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 true;
return false;
}
static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
list_move(&act->list, &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_is_running(act))
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 enum zfcp_erp_act_type zfcp_erp_handle_failed(
enum zfcp_erp_act_type want, struct zfcp_adapter *adapter,
struct zfcp_port *port, struct scsi_device *sdev)
{
enum zfcp_erp_act_type need = want;
struct zfcp_scsi_dev *zsdev;
switch (want) {
case ZFCP_ERP_ACTION_REOPEN_LUN:
zsdev = sdev_to_zfcp(sdev);
if (atomic_read(&zsdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
need = 0;
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
need = 0;
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
if (atomic_read(&port->status) &
ZFCP_STATUS_COMMON_ERP_FAILED) {
need = 0;
/* ensure propagation of failed status to new devices */
zfcp_erp_set_port_status(
port, ZFCP_STATUS_COMMON_ERP_FAILED);
}
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_ERP_FAILED) {
need = 0;
/* ensure propagation of failed status to new devices */
zfcp_erp_set_adapter_status(
adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
}
break;
}
return need;
}
static enum zfcp_erp_act_type zfcp_erp_required_act(enum zfcp_erp_act_type want,
struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct scsi_device *sdev)
{
enum zfcp_erp_act_type 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;
fallthrough;
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;
fallthrough;
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;
fallthrough;
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(enum zfcp_erp_act_type 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;
if (WARN_ON_ONCE(need != ZFCP_ERP_ACTION_REOPEN_LUN &&
need != ZFCP_ERP_ACTION_REOPEN_PORT &&
need != ZFCP_ERP_ACTION_REOPEN_PORT_FORCED &&
need != ZFCP_ERP_ACTION_REOPEN_ADAPTER))
return NULL;
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_or(ZFCP_STATUS_COMMON_ERP_INUSE,
&zfcp_sdev->status);
erp_action = &zfcp_sdev->erp_action;
WARN_ON_ONCE(erp_action->port != port);
WARN_ON_ONCE(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_or(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
erp_action = &port->erp_action;
WARN_ON_ONCE(erp_action->port != port);
WARN_ON_ONCE(erp_action->sdev != NULL);
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_or(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
erp_action = &adapter->erp_action;
WARN_ON_ONCE(erp_action->port != NULL);
WARN_ON_ONCE(erp_action->sdev != NULL);
if (!(atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_RUNNING))
act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
break;
}
WARN_ON_ONCE(erp_action->adapter != adapter);
memset(&erp_action->list, 0, sizeof(erp_action->list));
memset(&erp_action->timer, 0, sizeof(erp_action->timer));
erp_action->step = ZFCP_ERP_STEP_UNINITIALIZED;
erp_action->fsf_req_id = 0;
erp_action->type = need;
erp_action->status = act_status;
return erp_action;
}
static void zfcp_erp_action_enqueue(enum zfcp_erp_act_type want,
struct zfcp_adapter *adapter,
struct zfcp_port *port,
struct scsi_device *sdev,
char *dbftag, u32 act_status)
{
enum zfcp_erp_act_type need;
struct zfcp_erp_action *act;
need = zfcp_erp_handle_failed(want, adapter, port, sdev);
if (!need) {
need = ZFCP_ERP_ACTION_FAILED; /* marker for trace */
goto out;
}
if (!adapter->erp_thread) {
need = ZFCP_ERP_ACTION_NONE; /* marker for trace */
goto out;
}
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) {
need |= ZFCP_ERP_ACTION_NONE; /* marker for trace */
goto out;
}
atomic_or(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);
out:
zfcp_dbf_rec_trig(dbftag, adapter, port, sdev, want, need);
}
void zfcp_erp_port_forced_no_port_dbf(char *dbftag,
struct zfcp_adapter *adapter,
u64 port_name, u32 port_id)
{
unsigned long flags;
static /* don't waste stack */ struct zfcp_port tmpport;
write_lock_irqsave(&adapter->erp_lock, flags);
/* Stand-in zfcp port with fields just good enough for
* zfcp_dbf_rec_trig() and zfcp_dbf_set_common().
* Under lock because tmpport is static.
*/
atomic_set(&tmpport.status, -1); /* unknown */
tmpport.wwpn = port_name;
tmpport.d_id = port_id;
zfcp_dbf_rec_trig(dbftag, adapter, &tmpport, NULL,
ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
ZFCP_ERP_ACTION_NONE);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
static void _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
int clear_mask, char *dbftag)
{
zfcp_erp_adapter_block(adapter, clear_mask);
zfcp_scsi_schedule_rports_block(adapter);
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
adapter, NULL, NULL, dbftag, 0);
}
/**
* zfcp_erp_adapter_reopen - Reopen adapter.
* @adapter: Adapter to reopen.
* @clear: Status flags to clear.
* @dbftag: Tag for debug trace event.
*/
void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
char *dbftag)
{
unsigned long flags;
zfcp_erp_adapter_block(adapter, clear);
zfcp_scsi_schedule_rports_block(adapter);
write_lock_irqsave(&adapter->erp_lock, flags);
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
NULL, NULL, dbftag, 0);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
/**
* zfcp_erp_adapter_shutdown - Shutdown adapter.
* @adapter: Adapter to shut down.
* @clear: Status flags to clear.
* @dbftag: Tag for debug trace event.
*/
void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
char *dbftag)
{
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
zfcp_erp_adapter_reopen(adapter, clear | flags, dbftag);
}
/**
* zfcp_erp_port_shutdown - Shutdown port
* @port: Port to shut down.
* @clear: Status flags to clear.
* @dbftag: Tag for debug trace event.
*/
void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *dbftag)
{
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
zfcp_erp_port_reopen(port, clear | flags, dbftag);
}
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 *dbftag)
{
zfcp_erp_port_block(port, clear);
zfcp_scsi_schedule_rport_block(port);
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
port->adapter, port, NULL, dbftag, 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.
* @dbftag: Tag for debug trace event.
*/
void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
char *dbftag)
{
unsigned long flags;
struct zfcp_adapter *adapter = port->adapter;
write_lock_irqsave(&adapter->erp_lock, flags);
_zfcp_erp_port_forced_reopen(port, clear, dbftag);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
static void _zfcp_erp_port_reopen(struct zfcp_port *port, int clear,
char *dbftag)
{
zfcp_erp_port_block(port, clear);
zfcp_scsi_schedule_rport_block(port);
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
port->adapter, port, NULL, dbftag, 0);
}
/**
* zfcp_erp_port_reopen - trigger remote port recovery
* @port: port to recover
* @clear: flags in port status to be cleared
* @dbftag: Tag for debug trace event.
*/
void zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *dbftag)
{
unsigned long flags;
struct zfcp_adapter *adapter = port->adapter;
write_lock_irqsave(&adapter->erp_lock, flags);
_zfcp_erp_port_reopen(port, clear, dbftag);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
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 *dbftag, 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);
zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
zfcp_sdev->port, sdev, dbftag, act_status);
}
/**
* zfcp_erp_lun_reopen - initiate reopen of a LUN
* @sdev: SCSI device / LUN to be reopened
* @clear: specifies flags in LUN status to be cleared
* @dbftag: Tag for debug trace event.
*
* Return: 0 on success, < 0 on error
*/
void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *dbftag)
{
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, dbftag, 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.
* @dbftag: Tag for debug trace event.
*/
void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *dbftag)
{
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
zfcp_erp_lun_reopen(sdev, clear | flags, dbftag);
}
/**
* zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion
* @sdev: SCSI device / LUN to shut down.
* @dbftag: Tag 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 *dbftag)
{
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, dbftag, ZFCP_STATUS_ERP_NO_REF);
write_unlock_irqrestore(&adapter->erp_lock, flags);
zfcp_erp_wait(adapter);
}
static int zfcp_erp_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 (zfcp_erp_status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED,
&adapter->status))
zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
atomic_or(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
}
static void zfcp_erp_port_unblock(struct zfcp_port *port)
{
if (zfcp_erp_status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED,
&port->status))
zfcp_dbf_rec_run("erpubl1", &port->erp_action);
atomic_or(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 (zfcp_erp_status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED,
&zfcp_sdev->status))
zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
atomic_or(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);
/* lock-free concurrent access with
* zfcp_erp_timeout_handler()
*/
WRITE_ONCE(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_is_running(erp_action)) {
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
* @t: timer list entry embedded in zfcp FSF request
*/
void zfcp_erp_timeout_handler(struct timer_list *t)
{
struct zfcp_fsf_req *fsf_req = from_timer(fsf_req, t, timer);
struct zfcp_erp_action *act;
if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
return;
/* lock-free concurrent access with zfcp_erp_strategy_check_fsfreq() */
act = READ_ONCE(fsf_req->erp_action);
if (!act)
return;
zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
}
static void zfcp_erp_memwait_handler(struct timer_list *t)
{
struct zfcp_erp_action *act = from_timer(act, t, timer);
zfcp_erp_notify(act, 0);
}
static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
{
timer_setup(&erp_action->timer, zfcp_erp_memwait_handler, 0);
erp_action->timer.expires = jiffies + HZ;
add_timer(&erp_action->timer);
}
void zfcp_erp_port_forced_reopen_all(struct zfcp_adapter *adapter,
int clear, char *dbftag)
{
unsigned long flags;
struct zfcp_port *port;
write_lock_irqsave(&adapter->erp_lock, flags);
read_lock(&adapter->port_list_lock);
list_for_each_entry(port, &adapter->port_list, list)
_zfcp_erp_port_forced_reopen(port, clear, dbftag);
read_unlock(&adapter->port_list_lock);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
int clear, char *dbftag)
{
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, dbftag);
read_unlock(&adapter->port_list_lock);
}
static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
char *dbftag)
{
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, dbftag, 0);
spin_unlock(port->adapter->scsi_host->host_lock);
}
static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
{
switch (act->type) {
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->type) {
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;
case ZFCP_ERP_ACTION_REOPEN_LUN:
/* NOP */
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_andnot(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 enum zfcp_erp_act_result 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_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
for (retries = 7; retries; retries--) {
atomic_andnot(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_andnot(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_andnot(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
&adapter->status);
if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
return ZFCP_ERP_FAILED;
return ZFCP_ERP_SUCCEEDED;
}
static void
zfcp_erp_adapter_strategy_open_ptp_port(struct zfcp_adapter *const adapter)
{
if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
zfcp_erp_enqueue_ptp_port(adapter);
}
static enum zfcp_erp_act_result 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 enum zfcp_erp_act_result
zfcp_erp_adapter_strategy_alloc_shost(struct zfcp_adapter *const adapter)
{
struct zfcp_diag_adapter_config_data *const config_data =
&adapter->diagnostics->config_data;
struct zfcp_diag_adapter_port_data *const port_data =
&adapter->diagnostics->port_data;
unsigned long flags;
int rc;
rc = zfcp_scsi_adapter_register(adapter);
if (rc == -EEXIST)
return ZFCP_ERP_SUCCEEDED;
else if (rc)
return ZFCP_ERP_FAILED;
/*
* We allocated the shost for the first time. Before it was NULL,
* and so we deferred all updates in the xconf- and xport-data
* handlers. We need to make up for that now, and make all the updates
* that would have been done before.
*
* We can be sure that xconf- and xport-data succeeded, because
* otherwise this function is not called. But they might have been
* incomplete.
*/
spin_lock_irqsave(&config_data->header.access_lock, flags);
zfcp_scsi_shost_update_config_data(adapter, &config_data->data,
!!config_data->header.incomplete);
spin_unlock_irqrestore(&config_data->header.access_lock, flags);
if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
spin_lock_irqsave(&port_data->header.access_lock, flags);
zfcp_scsi_shost_update_port_data(adapter, &port_data->data);
spin_unlock_irqrestore(&port_data->header.access_lock, flags);
}
/*
* There is a remote possibility that the 'Exchange Port Data' request
* reports a different connectivity status than 'Exchange Config Data'.
* But any change to the connectivity status of the local optic that
* happens after the initial xconf request is expected to be reported
* to us, as soon as we post Status Read Buffers to the FCP channel
* firmware after this function. So any resulting inconsistency will
* only be momentary.
*/
if (config_data->header.incomplete)
zfcp_fsf_fc_host_link_down(adapter);
return ZFCP_ERP_SUCCEEDED;
}
static enum zfcp_erp_act_result 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 (zfcp_erp_adapter_strategy_alloc_shost(act->adapter) ==
ZFCP_ERP_FAILED)
return ZFCP_ERP_FAILED;
zfcp_erp_adapter_strategy_open_ptp_port(act->adapter);
if (mempool_resize(act->adapter->pool.sr_data,
act->adapter->stat_read_buf_num))
return ZFCP_ERP_FAILED;
if (mempool_resize(act->adapter->pool.status_read_req,
act->adapter->stat_read_buf_num))
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_andnot(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
}
static enum zfcp_erp_act_result zfcp_erp_adapter_strategy_open(
struct zfcp_erp_action *act)
{
struct zfcp_adapter *adapter = act->adapter;
if (zfcp_qdio_open(adapter->qdio)) {
atomic_andnot(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_or(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
return ZFCP_ERP_SUCCEEDED;
}
static enum zfcp_erp_act_result 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 enum zfcp_erp_act_result 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 enum zfcp_erp_act_result 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:
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;
break;
case ZFCP_ERP_STEP_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_OPENING:
case ZFCP_ERP_STEP_LUN_CLOSING:
case ZFCP_ERP_STEP_LUN_OPENING:
/* NOP */
break;
}
return ZFCP_ERP_FAILED;
}
static enum zfcp_erp_act_result 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 enum zfcp_erp_act_result 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 enum zfcp_erp_act_result 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;
}
/* no early return otherwise, continue after switch case */
break;
case ZFCP_ERP_STEP_LUN_CLOSING:
case ZFCP_ERP_STEP_LUN_OPENING:
/* NOP */
break;
}
return ZFCP_ERP_FAILED;
}
static enum zfcp_erp_act_result 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:
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;
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_OPENING:
case ZFCP_ERP_STEP_LUN_CLOSING:
case ZFCP_ERP_STEP_LUN_OPENING:
/* NOP */
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_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED,
&zfcp_sdev->status);
}
static enum zfcp_erp_act_result 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 enum zfcp_erp_act_result 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 enum zfcp_erp_act_result 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 */
fallthrough;
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);
case ZFCP_ERP_STEP_LUN_OPENING:
if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
return ZFCP_ERP_SUCCEEDED;
break;
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_CLOSING:
case ZFCP_ERP_STEP_PORT_OPENING:
/* NOP */
break;
}
return ZFCP_ERP_FAILED;
}
static enum zfcp_erp_act_result zfcp_erp_strategy_check_lun(
struct scsi_device *sdev, enum zfcp_erp_act_result result)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
switch (result) {
case ZFCP_ERP_SUCCEEDED :
atomic_set(&zfcp_sdev->erp_counter, 0);
zfcp_erp_lun_unblock(sdev);
break;
case ZFCP_ERP_FAILED :
atomic_inc(&zfcp_sdev->erp_counter);
if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) {
dev_err(&zfcp_sdev->port->adapter->ccw_device->dev,
"ERP failed for LUN 0x%016Lx on "
"port 0x%016Lx\n",
(unsigned long long)zfcp_scsi_dev_lun(sdev),
(unsigned long long)zfcp_sdev->port->wwpn);
zfcp_erp_set_lun_status(sdev,
ZFCP_STATUS_COMMON_ERP_FAILED);
}
break;
case ZFCP_ERP_CONTINUES:
case ZFCP_ERP_EXIT:
case ZFCP_ERP_DISMISSED:
case ZFCP_ERP_NOMEM:
/* NOP */
break;
}
if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
zfcp_erp_lun_block(sdev, 0);
result = ZFCP_ERP_EXIT;
}
return result;
}
static enum zfcp_erp_act_result zfcp_erp_strategy_check_port(
struct zfcp_port *port, enum zfcp_erp_act_result result)
{
switch (result) {
case ZFCP_ERP_SUCCEEDED :
atomic_set(&port->erp_counter, 0);
zfcp_erp_port_unblock(port);
break;
case ZFCP_ERP_FAILED :
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
zfcp_erp_port_block(port, 0);
result = ZFCP_ERP_EXIT;
}
atomic_inc(&port->erp_counter);
if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
dev_err(&port->adapter->ccw_device->dev,
"ERP failed for remote port 0x%016Lx\n",
(unsigned long long)port->wwpn);
zfcp_erp_set_port_status(port,
ZFCP_STATUS_COMMON_ERP_FAILED);
}
break;
case ZFCP_ERP_CONTINUES:
case ZFCP_ERP_EXIT:
case ZFCP_ERP_DISMISSED:
case ZFCP_ERP_NOMEM:
/* NOP */
break;
}
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
zfcp_erp_port_block(port, 0);
result = ZFCP_ERP_EXIT;
}
return result;
}
static enum zfcp_erp_act_result zfcp_erp_strategy_check_adapter(
struct zfcp_adapter *adapter, enum zfcp_erp_act_result result)
{
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) {
dev_err(&adapter->ccw_device->dev,
"ERP cannot recover an error "
"on the FCP device\n");
zfcp_erp_set_adapter_status(adapter,
ZFCP_STATUS_COMMON_ERP_FAILED);
}
break;
case ZFCP_ERP_CONTINUES:
case ZFCP_ERP_EXIT:
case ZFCP_ERP_DISMISSED:
case ZFCP_ERP_NOMEM:
/* NOP */
break;
}
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
zfcp_erp_adapter_block(adapter, 0);
result = ZFCP_ERP_EXIT;
}
return result;
}
static enum zfcp_erp_act_result zfcp_erp_strategy_check_target(
struct zfcp_erp_action *erp_action, enum zfcp_erp_act_result result)
{
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_port *port = erp_action->port;
struct scsi_device *sdev = erp_action->sdev;
switch (erp_action->type) {
case ZFCP_ERP_ACTION_REOPEN_LUN:
result = zfcp_erp_strategy_check_lun(sdev, 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;
}
static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
{
int status = atomic_read(target_status);
if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
return 1; /* take it online */
if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
!(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
return 1; /* take it offline */
return 0;
}
static enum zfcp_erp_act_result zfcp_erp_strategy_statechange(
struct zfcp_erp_action *act, enum zfcp_erp_act_result result)
{
enum zfcp_erp_act_type type = act->type;
struct zfcp_adapter *adapter = act->adapter;
struct zfcp_port *port = act->port;
struct scsi_device *sdev = act->sdev;
struct zfcp_scsi_dev *zfcp_sdev;
u32 erp_status = act->status;
switch (type) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
_zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_COMMON_ERP_FAILED,
"ersscg1");
return ZFCP_ERP_EXIT;
}
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
case ZFCP_ERP_ACTION_REOPEN_PORT:
if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
_zfcp_erp_port_reopen(port,
ZFCP_STATUS_COMMON_ERP_FAILED,
"ersscg2");
return ZFCP_ERP_EXIT;
}
break;
case ZFCP_ERP_ACTION_REOPEN_LUN:
zfcp_sdev = sdev_to_zfcp(sdev);
if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) {
_zfcp_erp_lun_reopen(sdev,
ZFCP_STATUS_COMMON_ERP_FAILED,
"ersscg3", 0);
return ZFCP_ERP_EXIT;
}
break;
}
return result;
}
static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
{
struct zfcp_adapter *adapter = erp_action->adapter;
struct zfcp_scsi_dev *zfcp_sdev;
adapter->erp_total_count--;
if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
adapter->erp_low_mem_count--;
erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
}
list_del(&erp_action->list);
zfcp_dbf_rec_run("eractd1", erp_action);
switch (erp_action->type) {
case ZFCP_ERP_ACTION_REOPEN_LUN:
zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
&zfcp_sdev->status);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
case ZFCP_ERP_ACTION_REOPEN_PORT:
atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
&erp_action->port->status);
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
atomic_andnot(ZFCP_STATUS_COMMON_ERP_INUSE,
&erp_action->adapter->status);
break;
}
}
/**
* zfcp_erp_try_rport_unblock - unblock rport if no more/new recovery
* @port: zfcp_port whose fc_rport we should try to unblock
*/
static void zfcp_erp_try_rport_unblock(struct zfcp_port *port)
{
unsigned long flags;
struct zfcp_adapter *adapter = port->adapter;
int port_status;
struct Scsi_Host *shost = adapter->scsi_host;
struct scsi_device *sdev;
write_lock_irqsave(&adapter->erp_lock, flags);
port_status = atomic_read(&port->status);
if ((port_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
(port_status & (ZFCP_STATUS_COMMON_ERP_INUSE |
ZFCP_STATUS_COMMON_ERP_FAILED)) != 0) {
/* new ERP of severity >= port triggered elsewhere meanwhile or
* local link down (adapter erp_failed but not clear unblock)
*/
zfcp_dbf_rec_run_lvl(4, "ertru_p", &port->erp_action);
write_unlock_irqrestore(&adapter->erp_lock, flags);
return;
}
spin_lock(shost->host_lock);
__shost_for_each_device(sdev, shost) {
struct zfcp_scsi_dev *zsdev = sdev_to_zfcp(sdev);
int lun_status;
if (sdev->sdev_state == SDEV_DEL ||
sdev->sdev_state == SDEV_CANCEL)
continue;
if (zsdev->port != port)
continue;
/* LUN under port of interest */
lun_status = atomic_read(&zsdev->status);
if ((lun_status & ZFCP_STATUS_COMMON_ERP_FAILED) != 0)
continue; /* unblock rport despite failed LUNs */
/* LUN recovery not given up yet [maybe follow-up pending] */
if ((lun_status & ZFCP_STATUS_COMMON_UNBLOCKED) == 0 ||
(lun_status & ZFCP_STATUS_COMMON_ERP_INUSE) != 0) {
/* LUN blocked:
* not yet unblocked [LUN recovery pending]
* or meanwhile blocked [new LUN recovery triggered]
*/
zfcp_dbf_rec_run_lvl(4, "ertru_l", &zsdev->erp_action);
spin_unlock(shost->host_lock);
write_unlock_irqrestore(&adapter->erp_lock, flags);
return;
}
}
/* now port has no child or all children have completed recovery,
* and no ERP of severity >= port was meanwhile triggered elsewhere
*/
zfcp_scsi_schedule_rport_register(port);
spin_unlock(shost->host_lock);
write_unlock_irqrestore(&adapter->erp_lock, flags);
}
static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act,
enum zfcp_erp_act_result result)
{
struct zfcp_adapter *adapter = act->adapter;
struct zfcp_port *port = act->port;
struct scsi_device *sdev = act->sdev;
switch (act->type) {
case ZFCP_ERP_ACTION_REOPEN_LUN:
if (!(act->status & ZFCP_STATUS_ERP_NO_REF))
scsi_device_put(sdev);
zfcp_erp_try_rport_unblock(port);
break;
case ZFCP_ERP_ACTION_REOPEN_PORT:
/* This switch case might also happen after a forced reopen
* was successfully done and thus overwritten with a new
* non-forced reopen at `ersfs_2'. In this case, we must not
* do the clean-up of the non-forced version.
*/
if (act->step != ZFCP_ERP_STEP_UNINITIALIZED)
if (result == ZFCP_ERP_SUCCEEDED)
zfcp_erp_try_rport_unblock(port);
fallthrough;
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
put_device(&port->dev);
break;
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
if (result == ZFCP_ERP_SUCCEEDED) {
register_service_level(&adapter->service_level);
zfcp_fc_conditional_port_scan(adapter);
queue_work(adapter->work_queue, &adapter->ns_up_work);
} else
unregister_service_level(&adapter->service_level);
kref_put(&adapter->ref, zfcp_adapter_release);
break;
}
}
static enum zfcp_erp_act_result zfcp_erp_strategy_do_action(
struct zfcp_erp_action *erp_action)
{
switch (erp_action->type) {
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
return zfcp_erp_adapter_strategy(erp_action);
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
return zfcp_erp_port_forced_strategy(erp_action);
case ZFCP_ERP_ACTION_REOPEN_PORT:
return zfcp_erp_port_strategy(erp_action);
case ZFCP_ERP_ACTION_REOPEN_LUN:
return zfcp_erp_lun_strategy(erp_action);
}
return ZFCP_ERP_FAILED;
}
static enum zfcp_erp_act_result zfcp_erp_strategy(
struct zfcp_erp_action *erp_action)
{
enum zfcp_erp_act_result result;
unsigned long flags;
struct zfcp_adapter *adapter = erp_action->adapter;
kref_get(&adapter->ref);
write_lock_irqsave(&adapter->erp_lock, flags);
zfcp_erp_strategy_check_fsfreq(erp_action);
if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
zfcp_erp_action_dequeue(erp_action);
result = ZFCP_ERP_DISMISSED;
goto unlock;
}
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
result = ZFCP_ERP_FAILED;
goto check_target;
}
zfcp_erp_action_to_running(erp_action);
/* no lock to allow for blocking operations */
write_unlock_irqrestore(&adapter->erp_lock, flags);
result = zfcp_erp_strategy_do_action(erp_action);
write_lock_irqsave(&adapter->erp_lock, flags);
if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
result = ZFCP_ERP_CONTINUES;
switch (result) {
case ZFCP_ERP_NOMEM:
if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
++adapter->erp_low_mem_count;
erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
}
if (adapter->erp_total_count == adapter->erp_low_mem_count)
_zfcp_erp_adapter_reopen(adapter, 0, "erstgy1");
else {
zfcp_erp_strategy_memwait(erp_action);
result = ZFCP_ERP_CONTINUES;
}
goto unlock;
case ZFCP_ERP_CONTINUES:
if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
--adapter->erp_low_mem_count;
erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
}
goto unlock;
case ZFCP_ERP_SUCCEEDED:
case ZFCP_ERP_FAILED:
case ZFCP_ERP_EXIT:
case ZFCP_ERP_DISMISSED:
/* NOP */
break;
}
check_target:
result = zfcp_erp_strategy_check_target(erp_action, result);
zfcp_erp_action_dequeue(erp_action);
result = zfcp_erp_strategy_statechange(erp_action, result);
if (result == ZFCP_ERP_EXIT)
goto unlock;
if (result == ZFCP_ERP_SUCCEEDED)
zfcp_erp_strategy_followup_success(erp_action);
if (result == ZFCP_ERP_FAILED)
zfcp_erp_strategy_followup_failed(erp_action);
unlock:
write_unlock_irqrestore(&adapter->erp_lock, flags);
if (result != ZFCP_ERP_CONTINUES)
zfcp_erp_action_cleanup(erp_action, result);
kref_put(&adapter->ref, zfcp_adapter_release);
return result;
}
static int zfcp_erp_thread(void *data)
{
struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
struct zfcp_erp_action *act;
unsigned long flags;
for (;;) {
wait_event_interruptible(adapter->erp_ready_wq,
!list_empty(&adapter->erp_ready_head) ||
kthread_should_stop());
if (kthread_should_stop())
break;
write_lock_irqsave(&adapter->erp_lock, flags);
act = list_first_entry_or_null(&adapter->erp_ready_head,
struct zfcp_erp_action, list);
write_unlock_irqrestore(&adapter->erp_lock, flags);
if (act) {
/* there is more to come after dismission, no notify */
if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
zfcp_erp_wakeup(adapter);
}
}
return 0;
}
/**
* zfcp_erp_thread_setup - Start ERP thread for adapter
* @adapter: Adapter to start the ERP thread for
*
* Return: 0 on success, or error code from kthread_run().
*/
int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
{
struct task_struct *thread;
thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
dev_name(&adapter->ccw_device->dev));
if (IS_ERR(thread)) {
dev_err(&adapter->ccw_device->dev,
"Creating an ERP thread for the FCP device failed.\n");
return PTR_ERR(thread);
}
adapter->erp_thread = thread;
return 0;
}
/**
* zfcp_erp_thread_kill - Stop ERP thread.
* @adapter: Adapter where the ERP thread should be stopped.
*
* 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.
*/
void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
{
kthread_stop(adapter->erp_thread);
adapter->erp_thread = NULL;
WARN_ON(!list_empty(&adapter->erp_ready_head));
WARN_ON(!list_empty(&adapter->erp_running_head));
}
/**
* zfcp_erp_wait - wait for completion of error recovery on an adapter
* @adapter: adapter for which to wait for completion of its error recovery
*/
void zfcp_erp_wait(struct zfcp_adapter *adapter)
{
wait_event(adapter->erp_done_wqh,
!(atomic_read(&adapter->status) &
ZFCP_STATUS_ADAPTER_ERP_PENDING));
}
/**
* zfcp_erp_set_adapter_status - set adapter status bits
* @adapter: adapter to change the status
* @mask: status bits to change
*
* Changes in common status bits are propagated to attached ports and LUNs.
*/
void zfcp_erp_set_adapter_status(struct zfcp_adapter *adapter, u32 mask)
{
struct zfcp_port *port;
struct scsi_device *sdev;
unsigned long flags;
u32 common_mask = mask & ZFCP_COMMON_FLAGS;
atomic_or(mask, &adapter->status);
if (!common_mask)
return;
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list)
atomic_or(common_mask, &port->status);
read_unlock_irqrestore(&adapter->port_list_lock, flags);
/*
* if `scsi_host` is missing, xconfig/xport data has never completed
* yet, so we can't access it, but there are also no SDEVs yet
*/
if (adapter->scsi_host == NULL)
return;
spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
__shost_for_each_device(sdev, adapter->scsi_host)
atomic_or(common_mask, &sdev_to_zfcp(sdev)->status);
spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
}
/**
* zfcp_erp_clear_adapter_status - clear adapter status bits
* @adapter: adapter to change the status
* @mask: status bits to change
*
* Changes in common status bits are propagated to attached ports and LUNs.
*/
void zfcp_erp_clear_adapter_status(struct zfcp_adapter *adapter, u32 mask)
{
struct zfcp_port *port;
struct scsi_device *sdev;
unsigned long flags;
u32 common_mask = mask & ZFCP_COMMON_FLAGS;
u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
atomic_andnot(mask, &adapter->status);
if (!common_mask)
return;
if (clear_counter)
atomic_set(&adapter->erp_counter, 0);
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list) {
atomic_andnot(common_mask, &port->status);
if (clear_counter)
atomic_set(&port->erp_counter, 0);
}
read_unlock_irqrestore(&adapter->port_list_lock, flags);
/*
* if `scsi_host` is missing, xconfig/xport data has never completed
* yet, so we can't access it, but there are also no SDEVs yet
*/
if (adapter->scsi_host == NULL)
return;
spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
__shost_for_each_device(sdev, adapter->scsi_host) {
atomic_andnot(common_mask, &sdev_to_zfcp(sdev)->status);
if (clear_counter)
atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
}
spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
}
/**
* zfcp_erp_set_port_status - set port status bits
* @port: port to change the status
* @mask: status bits to change
*
* Changes in common status bits are propagated to attached LUNs.
*/
void zfcp_erp_set_port_status(struct zfcp_port *port, u32 mask)
{
struct scsi_device *sdev;
u32 common_mask = mask & ZFCP_COMMON_FLAGS;
unsigned long flags;
atomic_or(mask, &port->status);
if (!common_mask)
return;
spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
__shost_for_each_device(sdev, port->adapter->scsi_host)
if (sdev_to_zfcp(sdev)->port == port)
atomic_or(common_mask,
&sdev_to_zfcp(sdev)->status);
spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
}
/**
* zfcp_erp_clear_port_status - clear port status bits
* @port: adapter to change the status
* @mask: status bits to change
*
* Changes in common status bits are propagated to attached LUNs.
*/
void zfcp_erp_clear_port_status(struct zfcp_port *port, u32 mask)
{
struct scsi_device *sdev;
u32 common_mask = mask & ZFCP_COMMON_FLAGS;
u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
unsigned long flags;
atomic_andnot(mask, &port->status);
if (!common_mask)
return;
if (clear_counter)
atomic_set(&port->erp_counter, 0);
spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
__shost_for_each_device(sdev, port->adapter->scsi_host)
if (sdev_to_zfcp(sdev)->port == port) {
atomic_andnot(common_mask,
&sdev_to_zfcp(sdev)->status);
if (clear_counter)
atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
}
spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
}
/**
* zfcp_erp_set_lun_status - set lun status bits
* @sdev: SCSI device / lun to set the status bits
* @mask: status bits to change
*/
void zfcp_erp_set_lun_status(struct scsi_device *sdev, u32 mask)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
atomic_or(mask, &zfcp_sdev->status);
}
/**
* zfcp_erp_clear_lun_status - clear lun status bits
* @sdev: SCSi device / lun to clear the status bits
* @mask: status bits to change
*/
void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask)
{
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
atomic_andnot(mask, &zfcp_sdev->status);
if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
atomic_set(&zfcp_sdev->erp_counter, 0);
}
/**
* zfcp_erp_adapter_reset_sync() - Really reopen adapter and wait.
* @adapter: Pointer to zfcp_adapter to reopen.
* @dbftag: Trace tag string of length %ZFCP_DBF_TAG_LEN.
*/
void zfcp_erp_adapter_reset_sync(struct zfcp_adapter *adapter, char *dbftag)
{
zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING);
zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, dbftag);
zfcp_erp_wait(adapter);
}