diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_erp.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_erp.c | 3585 |
1 files changed, 3585 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c new file mode 100644 index 00000000000..cfc0d8c588d --- /dev/null +++ b/drivers/s390/scsi/zfcp_erp.c @@ -0,0 +1,3585 @@ +/* + * + * linux/drivers/s390/scsi/zfcp_erp.c + * + * FCP adapter driver for IBM eServer zSeries + * + * (C) Copyright IBM Corp. 2002, 2004 + * + * Author(s): Martin Peschke <mpeschke@de.ibm.com> + * Raimund Schroeder <raimund.schroeder@de.ibm.com> + * Aron Zeh + * Wolfgang Taphorn + * Stefan Bader <stefan.bader@de.ibm.com> + * Heiko Carstens <heiko.carstens@de.ibm.com> + * Andreas Herrmann <aherrman@de.ibm.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#define ZFCP_LOG_AREA ZFCP_LOG_AREA_ERP + +#define ZFCP_ERP_REVISION "$Revision: 1.86 $" + +#include "zfcp_ext.h" + +static int zfcp_erp_adisc(struct zfcp_adapter *, fc_id_t); +static void zfcp_erp_adisc_handler(unsigned long); + +static int zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *, int); +static int zfcp_erp_port_forced_reopen_internal(struct zfcp_port *, int); +static int zfcp_erp_port_reopen_internal(struct zfcp_port *, int); +static int zfcp_erp_unit_reopen_internal(struct zfcp_unit *, int); + +static int zfcp_erp_port_reopen_all_internal(struct zfcp_adapter *, int); +static int zfcp_erp_unit_reopen_all_internal(struct zfcp_port *, int); + +static void zfcp_erp_adapter_block(struct zfcp_adapter *, int); +static void zfcp_erp_adapter_unblock(struct zfcp_adapter *); +static void zfcp_erp_port_block(struct zfcp_port *, int); +static void zfcp_erp_port_unblock(struct zfcp_port *); +static void zfcp_erp_unit_block(struct zfcp_unit *, int); +static void zfcp_erp_unit_unblock(struct zfcp_unit *); + +static int zfcp_erp_thread(void *); + +static int zfcp_erp_strategy(struct zfcp_erp_action *); + +static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *); +static int zfcp_erp_strategy_memwait(struct zfcp_erp_action *); +static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *, int); +static int zfcp_erp_strategy_check_unit(struct zfcp_unit *, int); +static int zfcp_erp_strategy_check_port(struct zfcp_port *, int); +static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *, int); +static int zfcp_erp_strategy_statechange(int, u32, struct zfcp_adapter *, + struct zfcp_port *, + struct zfcp_unit *, int); +static inline int zfcp_erp_strategy_statechange_detected(atomic_t *, u32); +static int zfcp_erp_strategy_followup_actions(int, struct zfcp_adapter *, + struct zfcp_port *, + struct zfcp_unit *, int); +static int zfcp_erp_strategy_check_queues(struct zfcp_adapter *); +static int zfcp_erp_strategy_check_action(struct zfcp_erp_action *, int); + +static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_generic(struct zfcp_erp_action *, int); +static int zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_close_qdio(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_close_fsf(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_open_fsf_xconfig(struct zfcp_erp_action *); +static int zfcp_erp_adapter_strategy_open_fsf_statusread( + struct zfcp_erp_action *); + +static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *); +static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *); + +static int zfcp_erp_port_strategy(struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_clearstati(struct zfcp_port *); +static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_open(struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_open_nameserver(struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_open_nameserver_wakeup( + struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_open_common_lookup(struct zfcp_erp_action *); +static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *); + +static int zfcp_erp_unit_strategy(struct zfcp_erp_action *); +static int zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *); +static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *); +static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *); + +static int zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *); +static int zfcp_erp_action_dismiss_port(struct zfcp_port *); +static int zfcp_erp_action_dismiss_unit(struct zfcp_unit *); +static int zfcp_erp_action_dismiss(struct zfcp_erp_action *); + +static int zfcp_erp_action_enqueue(int, struct zfcp_adapter *, + struct zfcp_port *, struct zfcp_unit *); +static int zfcp_erp_action_dequeue(struct zfcp_erp_action *); +static void zfcp_erp_action_cleanup(int, struct zfcp_adapter *, + struct zfcp_port *, struct zfcp_unit *, + int); + +static void zfcp_erp_action_ready(struct zfcp_erp_action *); +static int zfcp_erp_action_exists(struct zfcp_erp_action *); + +static inline void zfcp_erp_action_to_ready(struct zfcp_erp_action *); +static inline void zfcp_erp_action_to_running(struct zfcp_erp_action *); + +static void zfcp_erp_memwait_handler(unsigned long); +static void zfcp_erp_timeout_handler(unsigned long); +static inline void zfcp_erp_timeout_init(struct zfcp_erp_action *); + +/** + * zfcp_fsf_request_timeout_handler - called if a request timed out + * @data: pointer to adapter for handler function + * + * This function needs to be called if requests (ELS, Generic Service, + * or SCSI commands) exceed a certain time limit. The assumption is + * that after the time limit the adapter get stuck. So we trigger a reopen of + * the adapter. This should not be used for error recovery, SCSI abort + * commands and SCSI requests from SCSI mid-layer. + */ +void +zfcp_fsf_request_timeout_handler(unsigned long data) +{ + struct zfcp_adapter *adapter; + + adapter = (struct zfcp_adapter *) data; + + zfcp_erp_adapter_reopen(adapter, 0); +} + +/* + * function: zfcp_fsf_scsi_er_timeout_handler + * + * purpose: This function needs to be called whenever a SCSI error recovery + * action (abort/reset) does not return. + * Re-opening the adapter means that the command can be returned + * by zfcp (it is guarranteed that it does not return via the + * adapter anymore). The buffer can then be used again. + * + * returns: sod all + */ +void +zfcp_fsf_scsi_er_timeout_handler(unsigned long data) +{ + struct zfcp_adapter *adapter = (struct zfcp_adapter *) data; + + ZFCP_LOG_NORMAL("warning: SCSI error recovery timed out. " + "Restarting all operations on the adapter %s\n", + zfcp_get_busid_by_adapter(adapter)); + debug_text_event(adapter->erp_dbf, 1, "eh_lmem_tout"); + zfcp_erp_adapter_reopen(adapter, 0); + + return; +} + +/* + * function: + * + * purpose: called if an adapter failed, + * initiates adapter recovery which is done + * asynchronously + * + * returns: 0 - initiated action succesfully + * <0 - failed to initiate action + */ +int +zfcp_erp_adapter_reopen_internal(struct zfcp_adapter *adapter, int clear_mask) +{ + int retval; + + debug_text_event(adapter->erp_dbf, 5, "a_ro"); + ZFCP_LOG_DEBUG("reopen adapter %s\n", + zfcp_get_busid_by_adapter(adapter)); + + zfcp_erp_adapter_block(adapter, clear_mask); + + if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &adapter->status)) { + ZFCP_LOG_DEBUG("skipped reopen of failed adapter %s\n", + zfcp_get_busid_by_adapter(adapter)); + debug_text_event(adapter->erp_dbf, 5, "a_ro_f"); + /* ensure propagation of failed status to new devices */ + zfcp_erp_adapter_failed(adapter); + retval = -EIO; + goto out; + } + retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, + adapter, NULL, NULL); + + out: + return retval; +} + +/* + * function: + * + * purpose: Wrappper for zfcp_erp_adapter_reopen_internal + * used to ensure the correct locking + * + * returns: 0 - initiated action succesfully + * <0 - failed to initiate action + */ +int +zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear_mask) +{ + int retval; + unsigned long flags; + + read_lock_irqsave(&zfcp_data.config_lock, flags); + write_lock(&adapter->erp_lock); + retval = zfcp_erp_adapter_reopen_internal(adapter, clear_mask); + write_unlock(&adapter->erp_lock); + read_unlock_irqrestore(&zfcp_data.config_lock, flags); + + return retval; +} + +/* + * function: + * + * purpose: + * + * returns: + */ +int +zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear_mask) +{ + int retval; + + retval = zfcp_erp_adapter_reopen(adapter, + ZFCP_STATUS_COMMON_RUNNING | + ZFCP_STATUS_COMMON_ERP_FAILED | + clear_mask); + + return retval; +} + +/* + * function: + * + * purpose: + * + * returns: + */ +int +zfcp_erp_port_shutdown(struct zfcp_port *port, int clear_mask) +{ + int retval; + + retval = zfcp_erp_port_reopen(port, + ZFCP_STATUS_COMMON_RUNNING | + ZFCP_STATUS_COMMON_ERP_FAILED | + clear_mask); + + return retval; +} + +/* + * function: + * + * purpose: + * + * returns: + */ +int +zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear_mask) +{ + int retval; + + retval = zfcp_erp_unit_reopen(unit, + ZFCP_STATUS_COMMON_RUNNING | + ZFCP_STATUS_COMMON_ERP_FAILED | + clear_mask); + + return retval; +} + + +/** + * zfcp_erp_adisc - send ADISC ELS command + * @adapter: adapter structure + * @d_id: d_id of port where ADISC is sent to + */ +int +zfcp_erp_adisc(struct zfcp_adapter *adapter, fc_id_t d_id) +{ + struct zfcp_send_els *send_els; + struct zfcp_ls_adisc *adisc; + void *address = NULL; + int retval = 0; + struct timer_list *timer; + + send_els = kmalloc(sizeof(struct zfcp_send_els), GFP_ATOMIC); + if (send_els == NULL) + goto nomem; + memset(send_els, 0, sizeof(*send_els)); + + send_els->req = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC); + if (send_els->req == NULL) + goto nomem; + memset(send_els->req, 0, sizeof(*send_els->req)); + + send_els->resp = kmalloc(sizeof(struct scatterlist), GFP_ATOMIC); + if (send_els->resp == NULL) + goto nomem; + memset(send_els->resp, 0, sizeof(*send_els->resp)); + + address = (void *) get_zeroed_page(GFP_ATOMIC); + if (address == NULL) + goto nomem; + + zfcp_address_to_sg(address, send_els->req); + address += PAGE_SIZE >> 1; + zfcp_address_to_sg(address, send_els->resp); + send_els->req_count = send_els->resp_count = 1; + + send_els->adapter = adapter; + send_els->d_id = d_id; + send_els->handler = zfcp_erp_adisc_handler; + send_els->handler_data = (unsigned long) send_els; + + adisc = zfcp_sg_to_address(send_els->req); + send_els->ls_code = adisc->code = ZFCP_LS_ADISC; + + send_els->req->length = sizeof(struct zfcp_ls_adisc); + send_els->resp->length = sizeof(struct zfcp_ls_adisc_acc); + + /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports + without FC-AL-2 capability, so we don't set it */ + adisc->wwpn = adapter->wwpn; + adisc->wwnn = adapter->wwnn; + adisc->nport_id = adapter->s_id; + ZFCP_LOG_INFO("ADISC request from s_id 0x%08x to d_id 0x%08x " + "(wwpn=0x%016Lx, wwnn=0x%016Lx, " + "hard_nport_id=0x%08x, nport_id=0x%08x)\n", + adapter->s_id, d_id, (wwn_t) adisc->wwpn, + (wwn_t) adisc->wwnn, adisc->hard_nport_id, + adisc->nport_id); + + timer = kmalloc(sizeof(struct timer_list), GFP_ATOMIC); + if (!timer) + goto nomem; + + init_timer(timer); + timer->function = zfcp_fsf_request_timeout_handler; + timer->data = (unsigned long) adapter; + timer->expires = ZFCP_FSF_REQUEST_TIMEOUT; + send_els->timer = timer; + + retval = zfcp_fsf_send_els(send_els); + if (retval != 0) { + ZFCP_LOG_NORMAL("error: initiation of Send ELS failed for port " + "0x%08x on adapter %s\n", d_id, + zfcp_get_busid_by_adapter(adapter)); + del_timer(send_els->timer); + goto freemem; + } + + goto out; + + nomem: + retval = -ENOMEM; + freemem: + if (address != NULL) + __free_pages(send_els->req->page, 0); + if (send_els != NULL) { + kfree(send_els->timer); + kfree(send_els->req); + kfree(send_els->resp); + kfree(send_els); + } + out: + return retval; +} + + +/** + * zfcp_erp_adisc_handler - handler for ADISC ELS command + * @data: pointer to struct zfcp_send_els + * + * If ADISC failed (LS_RJT or timed out) forced reopen of the port is triggered. + */ +void +zfcp_erp_adisc_handler(unsigned long data) +{ + struct zfcp_send_els *send_els; + struct zfcp_port *port; + struct zfcp_adapter *adapter; + fc_id_t d_id; + struct zfcp_ls_adisc_acc *adisc; + + send_els = (struct zfcp_send_els *) data; + + del_timer(send_els->timer); + + adapter = send_els->adapter; + d_id = send_els->d_id; + + read_lock(&zfcp_data.config_lock); + port = zfcp_get_port_by_did(send_els->adapter, send_els->d_id); + read_unlock(&zfcp_data.config_lock); + + BUG_ON(port == NULL); + + /* request rejected or timed out */ + if (send_els->status != 0) { + ZFCP_LOG_NORMAL("ELS request rejected/timed out, " + "force physical port reopen " + "(adapter %s, port d_id=0x%08x)\n", + zfcp_get_busid_by_adapter(adapter), d_id); + debug_text_event(adapter->erp_dbf, 3, "forcreop"); + if (zfcp_erp_port_forced_reopen(port, 0)) + ZFCP_LOG_NORMAL("failed reopen of port " + "(adapter %s, wwpn=0x%016Lx)\n", + zfcp_get_busid_by_port(port), + port->wwpn); + goto out; + } + + adisc = zfcp_sg_to_address(send_els->resp); + + ZFCP_LOG_INFO("ADISC response from d_id 0x%08x to s_id " + "0x%08x (wwpn=0x%016Lx, wwnn=0x%016Lx, " + "hard_nport_id=0x%08x, nport_id=0x%08x)\n", + d_id, adapter->s_id, (wwn_t) adisc->wwpn, + (wwn_t) adisc->wwnn, adisc->hard_nport_id, + adisc->nport_id); + + /* set wwnn for port */ + if (port->wwnn == 0) + port->wwnn = adisc->wwnn; + + if (port->wwpn != adisc->wwpn) { + ZFCP_LOG_NORMAL("d_id assignment changed, reopening " + "port (adapter %s, wwpn=0x%016Lx, " + "adisc_resp_wwpn=0x%016Lx)\n", + zfcp_get_busid_by_port(port), + port->wwpn, (wwn_t) adisc->wwpn); + if (zfcp_erp_port_reopen(port, 0)) + ZFCP_LOG_NORMAL("failed reopen of port " + "(adapter %s, wwpn=0x%016Lx)\n", + zfcp_get_busid_by_port(port), + port->wwpn); + } + + out: + zfcp_port_put(port); + __free_pages(send_els->req->page, 0); + kfree(send_els->timer); + kfree(send_els->req); + kfree(send_els->resp); + kfree(send_els); +} + + +/** + * zfcp_test_link - lightweight link test procedure + * @port: port to be tested + * + * Test status of a link to a remote port using the ELS command ADISC. + */ +int +zfcp_test_link(struct zfcp_port *port) +{ + int retval; + + zfcp_port_get(port); + retval = zfcp_erp_adisc(port->adapter, port->d_id); + if (retval != 0) { + zfcp_port_put(port); + ZFCP_LOG_NORMAL("reopen needed for port 0x%016Lx " + "on adapter %s\n ", port->wwpn, + zfcp_get_busid_by_port(port)); + retval = zfcp_erp_port_forced_reopen(port, 0); + if (retval != 0) { + ZFCP_LOG_NORMAL("reopen of remote port 0x%016Lx " + "on adapter %s failed\n", port->wwpn, + zfcp_get_busid_by_port(port)); + retval = -EPERM; + } + } + + return retval; +} + + +/* + * function: + * + * purpose: called if a port failed to be opened normally + * initiates Forced Reopen recovery which is done + * asynchronously + * + * returns: 0 - initiated action succesfully + * <0 - failed to initiate action + */ +static int +zfcp_erp_port_forced_reopen_internal(struct zfcp_port *port, int clear_mask) +{ + int retval; + struct zfcp_adapter *adapter = port->adapter; + + debug_text_event(adapter->erp_dbf, 5, "pf_ro"); + debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t)); + + ZFCP_LOG_DEBUG("forced reopen of port 0x%016Lx on adapter %s\n", + port->wwpn, zfcp_get_busid_by_port(port)); + + zfcp_erp_port_block(port, clear_mask); + + if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) { + ZFCP_LOG_DEBUG("skipped forced reopen of failed port 0x%016Lx " + "on adapter %s\n", port->wwpn, + zfcp_get_busid_by_port(port)); + debug_text_event(adapter->erp_dbf, 5, "pf_ro_f"); + debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t)); + retval = -EIO; + goto out; + } + + retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED, + port->adapter, port, NULL); + + out: + return retval; +} + +/* + * function: + * + * purpose: Wrappper for zfcp_erp_port_forced_reopen_internal + * used to ensure the correct locking + * + * returns: 0 - initiated action succesfully + * <0 - failed to initiate action + */ +int +zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear_mask) +{ + int retval; + unsigned long flags; + struct zfcp_adapter *adapter; + + adapter = port->adapter; + read_lock_irqsave(&zfcp_data.config_lock, flags); + write_lock(&adapter->erp_lock); + retval = zfcp_erp_port_forced_reopen_internal(port, clear_mask); + write_unlock(&adapter->erp_lock); + read_unlock_irqrestore(&zfcp_data.config_lock, flags); + + return retval; +} + +/* + * function: + * + * purpose: called if a port is to be opened + * initiates Reopen recovery which is done + * asynchronously + * + * returns: 0 - initiated action succesfully + * <0 - failed to initiate action + */ +static int +zfcp_erp_port_reopen_internal(struct zfcp_port *port, int clear_mask) +{ + int retval; + struct zfcp_adapter *adapter = port->adapter; + + debug_text_event(adapter->erp_dbf, 5, "p_ro"); + debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t)); + + ZFCP_LOG_DEBUG("reopen of port 0x%016Lx on adapter %s\n", + port->wwpn, zfcp_get_busid_by_port(port)); + + zfcp_erp_port_block(port, clear_mask); + + if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &port->status)) { + ZFCP_LOG_DEBUG("skipped reopen of failed port 0x%016Lx " + "on adapter %s\n", port->wwpn, + zfcp_get_busid_by_port(port)); + debug_text_event(adapter->erp_dbf, 5, "p_ro_f"); + debug_event(adapter->erp_dbf, 5, &port->wwpn, sizeof (wwn_t)); + /* ensure propagation of failed status to new devices */ + zfcp_erp_port_failed(port); + retval = -EIO; + goto out; + } + + retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT, + port->adapter, port, NULL); + + out: + return retval; +} + +/** + * zfcp_erp_port_reopen - initiate reopen of a remote port + * @port: port to be reopened + * @clear_mask: specifies flags in port status to be cleared + * Return: 0 on success, < 0 on error + * + * This is a wrappper function for zfcp_erp_port_reopen_internal. It ensures + * correct locking. An error recovery task is initiated to do the reopen. + * To wait for the completion of the reopen zfcp_erp_wait should be used. + */ +int +zfcp_erp_port_reopen(struct zfcp_port *port, int clear_mask) +{ + int retval; + unsigned long flags; + struct zfcp_adapter *adapter = port->adapter; + + read_lock_irqsave(&zfcp_data.config_lock, flags); + write_lock(&adapter->erp_lock); + retval = zfcp_erp_port_reopen_internal(port, clear_mask); + write_unlock(&adapter->erp_lock); + read_unlock_irqrestore(&zfcp_data.config_lock, flags); + + return retval; +} + +/* + * function: + * + * purpose: called if a unit is to be opened + * initiates Reopen recovery which is done + * asynchronously + * + * returns: 0 - initiated action succesfully + * <0 - failed to initiate action + */ +static int +zfcp_erp_unit_reopen_internal(struct zfcp_unit *unit, int clear_mask) +{ + int retval; + struct zfcp_adapter *adapter = unit->port->adapter; + + debug_text_event(adapter->erp_dbf, 5, "u_ro"); + debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, sizeof (fcp_lun_t)); + ZFCP_LOG_DEBUG("reopen of unit 0x%016Lx on port 0x%016Lx " + "on adapter %s\n", unit->fcp_lun, + unit->port->wwpn, zfcp_get_busid_by_unit(unit)); + + zfcp_erp_unit_block(unit, clear_mask); + + if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status)) { + ZFCP_LOG_DEBUG("skipped reopen of failed unit 0x%016Lx " + "on port 0x%016Lx on adapter %s\n", + unit->fcp_lun, unit->port->wwpn, + zfcp_get_busid_by_unit(unit)); + debug_text_event(adapter->erp_dbf, 5, "u_ro_f"); + debug_event(adapter->erp_dbf, 5, &unit->fcp_lun, + sizeof (fcp_lun_t)); + retval = -EIO; + goto out; + } + + retval = zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT, + unit->port->adapter, unit->port, unit); + out: + return retval; +} + +/** + * zfcp_erp_unit_reopen - initiate reopen of a unit + * @unit: unit to be reopened + * @clear_mask: specifies flags in unit status to be cleared + * Return: 0 on success, < 0 on error + * + * This is a wrappper for zfcp_erp_unit_reopen_internal. It ensures correct + * locking. An error recovery task is initiated to do the reopen. + * To wait for the completion of the reopen zfcp_erp_wait should be used. + */ +int +zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear_mask) +{ + int retval; + unsigned long flags; + struct zfcp_adapter *adapter; + struct zfcp_port *port; + + port = unit->port; + adapter = port->adapter; + + read_lock_irqsave(&zfcp_data.config_lock, flags); + write_lock(&adapter->erp_lock); + retval = zfcp_erp_unit_reopen_internal(unit, clear_mask); + write_unlock(&adapter->erp_lock); + read_unlock_irqrestore(&zfcp_data.config_lock, flags); + + return retval; +} + +/* + * function: + * + * purpose: disable I/O, + * return any open requests and clean them up, + * aim: no pending and incoming I/O + * + * returns: + */ +static void +zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int clear_mask) +{ + debug_text_event(adapter->erp_dbf, 6, "a_bl"); + zfcp_erp_modify_adapter_status(adapter, + ZFCP_STATUS_COMMON_UNBLOCKED | + clear_mask, ZFCP_CLEAR); +} + +/* + * function: + * + * purpose: enable I/O + * + * returns: + */ +static void +zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter) +{ + debug_text_event(adapter->erp_dbf, 6, "a_ubl"); + atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status); +} + +/* + * function: + * + * purpose: disable I/O, + * return any open requests and clean them up, + * aim: no pending and incoming I/O + * + * returns: + */ +static void +zfcp_erp_port_block(struct zfcp_port *port, int clear_mask) +{ + struct zfcp_adapter *adapter = port->adapter; + + debug_text_event(adapter->erp_dbf, 6, "p_bl"); + debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t)); + zfcp_erp_modify_port_status(port, + ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask, + ZFCP_CLEAR); +} + +/* + * function: + * + * purpose: enable I/O + * + * returns: + */ +static void +zfcp_erp_port_unblock(struct zfcp_port *port) +{ + struct zfcp_adapter *adapter = port->adapter; + + debug_text_event(adapter->erp_dbf, 6, "p_ubl"); + debug_event(adapter->erp_dbf, 6, &port->wwpn, sizeof (wwn_t)); + atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status); +} + +/* + * function: + * + * purpose: disable I/O, + * return any open requests and clean them up, + * aim: no pending and incoming I/O + * + * returns: + */ +static void +zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask) +{ + struct zfcp_adapter *adapter = unit->port->adapter; + + debug_text_event(adapter->erp_dbf, 6, "u_bl"); + debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t)); + zfcp_erp_modify_unit_status(unit, + ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask, + ZFCP_CLEAR); +} + +/* + * function: + * + * purpose: enable I/O + * + * returns: + */ +static void +zfcp_erp_unit_unblock(struct zfcp_unit *unit) +{ + struct zfcp_adapter *adapter = unit->port->adapter; + + debug_text_event(adapter->erp_dbf, 6, "u_ubl"); + debug_event(adapter->erp_dbf, 6, &unit->fcp_lun, sizeof (fcp_lun_t)); + atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status); +} + +/* + * function: + * + * purpose: + * + * returns: + */ +static void +zfcp_erp_action_ready(struct zfcp_erp_action *erp_action) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + + debug_text_event(adapter->erp_dbf, 4, "a_ar"); + debug_event(adapter->erp_dbf, 4, &erp_action->action, sizeof (int)); + + zfcp_erp_action_to_ready(erp_action); + up(&adapter->erp_ready_sem); +} + +/* + * function: + * + * purpose: + * + * returns: <0 erp_action not found in any list + * ZFCP_ERP_ACTION_READY erp_action is in ready list + * ZFCP_ERP_ACTION_RUNNING erp_action is in running list + * + * locks: erp_lock must be held + */ +static int +zfcp_erp_action_exists(struct zfcp_erp_action *erp_action) +{ + int retval = -EINVAL; + struct list_head *entry; + struct zfcp_erp_action *entry_erp_action; + struct zfcp_adapter *adapter = erp_action->adapter; + + /* search in running list */ + list_for_each(entry, &adapter->erp_running_head) { + entry_erp_action = + list_entry(entry, struct zfcp_erp_action, list); + if (entry_erp_action == erp_action) { + retval = ZFCP_ERP_ACTION_RUNNING; + goto out; + } + } + /* search in ready list */ + list_for_each(entry, &adapter->erp_ready_head) { + entry_erp_action = + list_entry(entry, struct zfcp_erp_action, list); + if (entry_erp_action == erp_action) { + retval = ZFCP_ERP_ACTION_READY; + goto out; + } + } + + out: + return retval; +} + +/* + * purpose: checks current status of action (timed out, dismissed, ...) + * and does appropriate preparations (dismiss fsf request, ...) + * + * locks: called under erp_lock (disabled interrupts) + * + * returns: 0 + */ +static int +zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action) +{ + int retval = 0; + struct zfcp_fsf_req *fsf_req; + struct zfcp_adapter *adapter = erp_action->adapter; + + if (erp_action->fsf_req) { + /* take lock to ensure that request is not being deleted meanwhile */ + write_lock(&adapter->fsf_req_list_lock); + /* check whether fsf req does still exist */ + list_for_each_entry(fsf_req, &adapter->fsf_req_list_head, list) + if (fsf_req == erp_action->fsf_req) + break; + if (fsf_req == erp_action->fsf_req) { + /* fsf_req still exists */ + debug_text_event(adapter->erp_dbf, 3, "a_ca_req"); + debug_event(adapter->erp_dbf, 3, &fsf_req, + sizeof (unsigned long)); + /* dismiss fsf_req of timed out or dismissed erp_action */ + if (erp_action->status & (ZFCP_STATUS_ERP_DISMISSED | + ZFCP_STATUS_ERP_TIMEDOUT)) { + debug_text_event(adapter->erp_dbf, 3, + "a_ca_disreq"); + fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED; + } + if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) { + ZFCP_LOG_NORMAL("error: erp step timed out " + "(action=%d, fsf_req=%p)\n ", + erp_action->action, + erp_action->fsf_req); + } + /* + * If fsf_req is neither dismissed nor completed + * then keep it running asynchronously and don't mess + * with the association of erp_action and fsf_req. + */ + if (fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED | + ZFCP_STATUS_FSFREQ_DISMISSED)) { + /* forget about association between fsf_req + and erp_action */ + fsf_req->erp_action = NULL; + erp_action->fsf_req = NULL; + } + } else { + debug_text_event(adapter->erp_dbf, 3, "a_ca_gonereq"); + /* + * even if this fsf_req has gone, forget about + * association between erp_action and fsf_req + */ + erp_action->fsf_req = NULL; + } + write_unlock(&adapter->fsf_req_list_lock); + } else + debug_text_event(adapter->erp_dbf, 3, "a_ca_noreq"); + + return retval; +} + +/* + * purpose: generic handler for asynchronous events related to erp_action events + * (normal completion, time-out, dismissing, retry after + * low memory condition) + * + * note: deletion of timer is not required (e.g. in case of a time-out), + * but a second try does no harm, + * we leave it in here to allow for greater simplification + * + * returns: 0 - there was an action to handle + * !0 - otherwise + */ +static int +zfcp_erp_async_handler_nolock(struct zfcp_erp_action *erp_action, + unsigned long set_mask) +{ + int retval; + struct zfcp_adapter *adapter = erp_action->adapter; + + if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) { + debug_text_event(adapter->erp_dbf, 2, "a_asyh_ex"); + debug_event(adapter->erp_dbf, 2, &erp_action->action, + sizeof (int)); + if (!(set_mask & ZFCP_STATUS_ERP_TIMEDOUT)) + del_timer(&erp_action->timer); + erp_action->status |= set_mask; + zfcp_erp_action_ready(erp_action); + retval = 0; + } else { + /* action is ready or gone - nothing to do */ + debug_text_event(adapter->erp_dbf, 3, "a_asyh_gone"); + debug_event(adapter->erp_dbf, 3, &erp_action->action, + sizeof (int)); + retval = 1; + } + + return retval; +} + +/* + * purpose: generic handler for asynchronous events related to erp_action + * events (normal completion, time-out, dismissing, retry after + * low memory condition) + * + * note: deletion of timer is not required (e.g. in case of a time-out), + * but a second try does no harm, + * we leave it in here to allow for greater simplification + * + * returns: 0 - there was an action to handle + * !0 - otherwise + */ +int +zfcp_erp_async_handler(struct zfcp_erp_action *erp_action, + unsigned long set_mask) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + unsigned long flags; + int retval; + + write_lock_irqsave(&adapter->erp_lock, flags); + retval = zfcp_erp_async_handler_nolock(erp_action, set_mask); + write_unlock_irqrestore(&adapter->erp_lock, flags); + + return retval; +} + +/* + * purpose: is called for erp_action which was slept waiting for + * memory becoming avaliable, + * will trigger that this action will be continued + */ +static void +zfcp_erp_memwait_handler(unsigned long data) +{ + struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data; + struct zfcp_adapter *adapter = erp_action->adapter; + + debug_text_event(adapter->erp_dbf, 2, "a_mwh"); + debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int)); + + zfcp_erp_async_handler(erp_action, 0); +} + +/* + * purpose: is called if an asynchronous erp step timed out, + * action gets an appropriate flag and will be processed + * accordingly + */ +static void +zfcp_erp_timeout_handler(unsigned long data) +{ + struct zfcp_erp_action *erp_action = (struct zfcp_erp_action *) data; + struct zfcp_adapter *adapter = erp_action->adapter; + + debug_text_event(adapter->erp_dbf, 2, "a_th"); + debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int)); + + zfcp_erp_async_handler(erp_action, ZFCP_STATUS_ERP_TIMEDOUT); +} + +/* + * purpose: is called for an erp_action which needs to be ended + * though not being done, + * this is usually required if an higher is generated, + * action gets an appropriate flag and will be processed + * accordingly + * + * locks: erp_lock held (thus we need to call another handler variant) + */ +static int +zfcp_erp_action_dismiss(struct zfcp_erp_action *erp_action) +{ + struct zfcp_adapter *adapter = erp_action->adapter; + + debug_text_event(adapter->erp_dbf, 2, "a_adis"); + debug_event(adapter->erp_dbf, 2, &erp_action->action, sizeof (int)); + + zfcp_erp_async_handler_nolock(erp_action, ZFCP_STATUS_ERP_DISMISSED); + + return 0; +} + +int +zfcp_erp_thread_setup(struct zfcp_adapter *adapter) +{ + int retval = 0; + + atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status); + + rwlock_init(&adapter->erp_lock); + INIT_LIST_HEAD(&adapter->erp_ready_head); + INIT_LIST_HEAD(&adapter->erp_running_head); + sema_init(&adapter->erp_ready_sem, 0); + + retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD); + if (retval < 0) { + ZFCP_LOG_NORMAL("error: creation of erp thread failed for " + "adapter %s\n", + zfcp_get_busid_by_adapter(adapter)); + debug_text_event(adapter->erp_dbf, 5, "a_thset_fail"); + } else { + wait_event(adapter->erp_thread_wqh, + atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, + &adapter->status)); + debug_text_event(adapter->erp_dbf, 5, "a_thset_ok"); + } + + return (retval < 0); +} + +/* + * function: + * + * purpose: + * + * returns: + * + * context: process (i.e. proc-fs or rmmod/insmod) + * + * note: The caller of this routine ensures that the specified + * adapter has been shut down and that this operation + * has been completed. Thus, there are no pending erp_actions + * which would need to be handled here. + */ +int +zfcp_erp_thread_kill(struct zfcp_adapter *adapter) +{ + int retval = 0; + + atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status); + up(&adapter->erp_ready_sem); + + wait_event(adapter->erp_thread_wqh, + !atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, + &adapter->status)); + + atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, + &adapter->status); + + debug_text_event(adapter->erp_dbf, 5, "a_thki_ok"); + + return retval; +} + +/* + * purpose: is run as a kernel thread, + * goes through list of error recovery actions of associated adapter + * and delegates single action to execution + * + * returns: 0 + */ |