| /* |
| * zfcp device driver |
| * |
| * Error Recovery Procedures (ERP). |
| * |
| * Copyright IBM Corp. 2002, 2016 |
| */ |
| |
| #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_or(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_or(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_or(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_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); |
| 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_or(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_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 (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); |
| 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) |
| { |
| setup_timer(&erp_action->timer, zfcp_erp_memwait_handler, |
| (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_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 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_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; |
| |
| 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)) |
| 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 int 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 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 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: |
| 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: |
| 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_andnot(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); |
| |
| case ZFCP_ERP_STEP_LUN_OPENING: |
| if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN) |
| return ZFCP_ERP_SUCCEEDED; |
| } |
| return ZFCP_ERP_FAILED; |
| } |
| |
| static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int 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; |
| } |
| |
| if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { |
| zfcp_erp_lun_block(sdev, 0); |
| result = ZFCP_ERP_EXIT; |
| } |
| return result; |
| } |
| |
| static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int 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; |
| } |
| |
| if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { |
| zfcp_erp_port_block(port, 0); |
| result = ZFCP_ERP_EXIT; |
| } |
| return result; |
| } |
| |
| static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter, |
| int 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; |
| } |
| |
| if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { |
| zfcp_erp_adapter_block(adapter, 0); |
| result = ZFCP_ERP_EXIT; |
| } |
| return result; |
| } |
| |
| 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 scsi_device *sdev = erp_action->sdev; |
| |
| switch (erp_action->action) { |
| |
| 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 int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret) |
| { |
| int action = act->action; |
| 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 (action) { |
| 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 ret; |
| } |
| |
| 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->action) { |
| 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 (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, int result) |
| { |
| struct zfcp_adapter *adapter = act->adapter; |
| struct zfcp_port *port = act->port; |
| struct scsi_device *sdev = act->sdev; |
| |
| switch (act->action) { |
| 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); |
| /* fall through */ |
| 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 int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action) |
| { |
| switch (erp_action->action) { |
| 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 int zfcp_erp_strategy(struct zfcp_erp_action *erp_action) |
| { |
| int retval; |
| 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); |
| retval = ZFCP_ERP_DISMISSED; |
| goto unlock; |
| } |
| |
| if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) { |
| retval = 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); |
| retval = zfcp_erp_strategy_do_action(erp_action); |
| write_lock_irqsave(&adapter->erp_lock, flags); |
| |
| if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) |
| retval = ZFCP_ERP_CONTINUES; |
| |
| switch (retval) { |
| 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); |
| retval = 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; |
| } |
| |
| check_target: |
| retval = zfcp_erp_strategy_check_target(erp_action, retval); |
| zfcp_erp_action_dequeue(erp_action); |
| retval = zfcp_erp_strategy_statechange(erp_action, retval); |
| if (retval == ZFCP_ERP_EXIT) |
| goto unlock; |
| if (retval == ZFCP_ERP_SUCCEEDED) |
| zfcp_erp_strategy_followup_success(erp_action); |
| if (retval == ZFCP_ERP_FAILED) |
| zfcp_erp_strategy_followup_failed(erp_action); |
| |
| unlock: |
| write_unlock_irqrestore(&adapter->erp_lock, flags); |
| |
| if (retval != ZFCP_ERP_CONTINUES) |
| zfcp_erp_action_cleanup(erp_action, retval); |
| |
| kref_put(&adapter->ref, zfcp_adapter_release); |
| return retval; |
| } |
| |
| static int zfcp_erp_thread(void *data) |
| { |
| struct zfcp_adapter *adapter = (struct zfcp_adapter *) data; |
| struct list_head *next; |
| 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); |
| next = adapter->erp_ready_head.next; |
| write_unlock_irqrestore(&adapter->erp_lock, flags); |
| |
| if (next != &adapter->erp_ready_head) { |
| act = list_entry(next, struct zfcp_erp_action, list); |
| |
| /* 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 |
| * |
| * Returns 0 on success or error code from kernel_thread() |
| */ |
| 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); |
| |
| 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); |
| |
| 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); |
| } |
| |