mirror of https://gitee.com/openkylin/linux.git
1560 lines
43 KiB
C
1560 lines
43 KiB
C
/*
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* zfcp device driver
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*
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* Error Recovery Procedures (ERP).
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*
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* Copyright IBM Corp. 2002, 2010
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kthread.h>
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#include "zfcp_ext.h"
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#include "zfcp_reqlist.h"
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#define ZFCP_MAX_ERPS 3
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enum zfcp_erp_act_flags {
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ZFCP_STATUS_ERP_TIMEDOUT = 0x10000000,
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ZFCP_STATUS_ERP_CLOSE_ONLY = 0x01000000,
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ZFCP_STATUS_ERP_DISMISSING = 0x00100000,
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ZFCP_STATUS_ERP_DISMISSED = 0x00200000,
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ZFCP_STATUS_ERP_LOWMEM = 0x00400000,
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ZFCP_STATUS_ERP_NO_REF = 0x00800000,
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};
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enum zfcp_erp_steps {
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ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
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ZFCP_ERP_STEP_FSF_XCONFIG = 0x0001,
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ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
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ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
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ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
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ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
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ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
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};
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enum zfcp_erp_act_type {
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ZFCP_ERP_ACTION_REOPEN_LUN = 1,
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ZFCP_ERP_ACTION_REOPEN_PORT = 2,
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ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
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ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
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};
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enum zfcp_erp_act_state {
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ZFCP_ERP_ACTION_RUNNING = 1,
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ZFCP_ERP_ACTION_READY = 2,
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};
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enum zfcp_erp_act_result {
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ZFCP_ERP_SUCCEEDED = 0,
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ZFCP_ERP_FAILED = 1,
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ZFCP_ERP_CONTINUES = 2,
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ZFCP_ERP_EXIT = 3,
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ZFCP_ERP_DISMISSED = 4,
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ZFCP_ERP_NOMEM = 5,
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};
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static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
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{
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zfcp_erp_clear_adapter_status(adapter,
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ZFCP_STATUS_COMMON_UNBLOCKED | mask);
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}
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static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
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{
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struct zfcp_erp_action *curr_act;
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list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
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if (act == curr_act)
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return ZFCP_ERP_ACTION_RUNNING;
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return 0;
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}
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static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
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{
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struct zfcp_adapter *adapter = act->adapter;
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list_move(&act->list, &act->adapter->erp_ready_head);
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zfcp_dbf_rec_run("erardy1", act);
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wake_up(&adapter->erp_ready_wq);
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zfcp_dbf_rec_run("erardy2", act);
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}
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static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
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{
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act->status |= ZFCP_STATUS_ERP_DISMISSED;
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if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
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zfcp_erp_action_ready(act);
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}
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static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
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{
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
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zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
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}
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static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
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{
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struct scsi_device *sdev;
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if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
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zfcp_erp_action_dismiss(&port->erp_action);
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else
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shost_for_each_device(sdev, port->adapter->scsi_host)
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if (sdev_to_zfcp(sdev)->port == port)
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zfcp_erp_action_dismiss_lun(sdev);
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}
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static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
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{
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struct zfcp_port *port;
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if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
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zfcp_erp_action_dismiss(&adapter->erp_action);
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else {
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read_lock(&adapter->port_list_lock);
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list_for_each_entry(port, &adapter->port_list, list)
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zfcp_erp_action_dismiss_port(port);
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read_unlock(&adapter->port_list_lock);
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}
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}
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static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
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struct zfcp_port *port,
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struct scsi_device *sdev)
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{
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int need = want;
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int l_status, p_status, a_status;
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struct zfcp_scsi_dev *zfcp_sdev;
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switch (want) {
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case ZFCP_ERP_ACTION_REOPEN_LUN:
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zfcp_sdev = sdev_to_zfcp(sdev);
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l_status = atomic_read(&zfcp_sdev->status);
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if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
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return 0;
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p_status = atomic_read(&port->status);
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if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
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p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
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return 0;
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if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
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need = ZFCP_ERP_ACTION_REOPEN_PORT;
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/* fall through */
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case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
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p_status = atomic_read(&port->status);
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if (!(p_status & ZFCP_STATUS_COMMON_OPEN))
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need = ZFCP_ERP_ACTION_REOPEN_PORT;
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/* fall through */
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case ZFCP_ERP_ACTION_REOPEN_PORT:
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p_status = atomic_read(&port->status);
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if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
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return 0;
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a_status = atomic_read(&adapter->status);
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if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
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a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
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return 0;
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if (p_status & ZFCP_STATUS_COMMON_NOESC)
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return need;
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if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
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need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
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/* fall through */
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case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
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a_status = atomic_read(&adapter->status);
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if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
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return 0;
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if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
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!(a_status & ZFCP_STATUS_COMMON_OPEN))
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return 0; /* shutdown requested for closed adapter */
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}
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return need;
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}
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static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
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struct zfcp_adapter *adapter,
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struct zfcp_port *port,
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struct scsi_device *sdev)
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{
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struct zfcp_erp_action *erp_action;
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struct zfcp_scsi_dev *zfcp_sdev;
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switch (need) {
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case ZFCP_ERP_ACTION_REOPEN_LUN:
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zfcp_sdev = sdev_to_zfcp(sdev);
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if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
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if (scsi_device_get(sdev))
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return NULL;
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atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
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&zfcp_sdev->status);
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erp_action = &zfcp_sdev->erp_action;
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memset(erp_action, 0, sizeof(struct zfcp_erp_action));
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erp_action->port = port;
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erp_action->sdev = sdev;
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if (!(atomic_read(&zfcp_sdev->status) &
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ZFCP_STATUS_COMMON_RUNNING))
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act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
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break;
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case ZFCP_ERP_ACTION_REOPEN_PORT:
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case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
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if (!get_device(&port->dev))
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return NULL;
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zfcp_erp_action_dismiss_port(port);
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atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
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erp_action = &port->erp_action;
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memset(erp_action, 0, sizeof(struct zfcp_erp_action));
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erp_action->port = port;
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if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
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act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
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break;
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case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
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kref_get(&adapter->ref);
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zfcp_erp_action_dismiss_adapter(adapter);
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atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
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erp_action = &adapter->erp_action;
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memset(erp_action, 0, sizeof(struct zfcp_erp_action));
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if (!(atomic_read(&adapter->status) &
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ZFCP_STATUS_COMMON_RUNNING))
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act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
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break;
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default:
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return NULL;
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}
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erp_action->adapter = adapter;
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erp_action->action = need;
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erp_action->status = act_status;
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return erp_action;
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}
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static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
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struct zfcp_port *port,
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struct scsi_device *sdev,
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char *id, u32 act_status)
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{
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int retval = 1, need;
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struct zfcp_erp_action *act;
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if (!adapter->erp_thread)
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return -EIO;
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need = zfcp_erp_required_act(want, adapter, port, sdev);
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if (!need)
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goto out;
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act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
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if (!act)
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goto out;
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atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
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++adapter->erp_total_count;
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list_add_tail(&act->list, &adapter->erp_ready_head);
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wake_up(&adapter->erp_ready_wq);
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retval = 0;
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out:
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zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need);
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return retval;
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}
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static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
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int clear_mask, char *id)
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{
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zfcp_erp_adapter_block(adapter, clear_mask);
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zfcp_scsi_schedule_rports_block(adapter);
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/* ensure propagation of failed status to new devices */
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if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
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zfcp_erp_set_adapter_status(adapter,
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ZFCP_STATUS_COMMON_ERP_FAILED);
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return -EIO;
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}
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return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
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adapter, NULL, NULL, id, 0);
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}
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/**
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* zfcp_erp_adapter_reopen - Reopen adapter.
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* @adapter: Adapter to reopen.
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* @clear: Status flags to clear.
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* @id: Id for debug trace event.
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*/
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void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id)
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{
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unsigned long flags;
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zfcp_erp_adapter_block(adapter, clear);
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zfcp_scsi_schedule_rports_block(adapter);
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write_lock_irqsave(&adapter->erp_lock, flags);
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if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
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zfcp_erp_set_adapter_status(adapter,
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ZFCP_STATUS_COMMON_ERP_FAILED);
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else
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zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
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NULL, NULL, id, 0);
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write_unlock_irqrestore(&adapter->erp_lock, flags);
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}
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/**
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* zfcp_erp_adapter_shutdown - Shutdown adapter.
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* @adapter: Adapter to shut down.
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* @clear: Status flags to clear.
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* @id: Id for debug trace event.
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*/
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void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
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char *id)
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{
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int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
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zfcp_erp_adapter_reopen(adapter, clear | flags, id);
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}
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/**
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* zfcp_erp_port_shutdown - Shutdown port
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* @port: Port to shut down.
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* @clear: Status flags to clear.
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* @id: Id for debug trace event.
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*/
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void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id)
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{
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int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
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zfcp_erp_port_reopen(port, clear | flags, id);
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}
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static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
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{
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zfcp_erp_clear_port_status(port,
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ZFCP_STATUS_COMMON_UNBLOCKED | clear);
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}
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static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
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char *id)
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{
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zfcp_erp_port_block(port, clear);
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zfcp_scsi_schedule_rport_block(port);
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if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
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return;
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zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
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port->adapter, port, NULL, id, 0);
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}
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/**
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* zfcp_erp_port_forced_reopen - Forced close of port and open again
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* @port: Port to force close and to reopen.
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* @clear: Status flags to clear.
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* @id: Id for debug trace event.
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*/
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void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id)
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{
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unsigned long flags;
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struct zfcp_adapter *adapter = port->adapter;
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write_lock_irqsave(&adapter->erp_lock, flags);
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_zfcp_erp_port_forced_reopen(port, clear, id);
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write_unlock_irqrestore(&adapter->erp_lock, flags);
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}
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static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
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{
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zfcp_erp_port_block(port, clear);
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zfcp_scsi_schedule_rport_block(port);
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if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
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/* ensure propagation of failed status to new devices */
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zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
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return -EIO;
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}
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return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
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port->adapter, port, NULL, id, 0);
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}
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/**
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* zfcp_erp_port_reopen - trigger remote port recovery
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* @port: port to recover
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* @clear_mask: flags in port status to be cleared
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* @id: Id for debug trace event.
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*
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* Returns 0 if recovery has been triggered, < 0 if not.
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*/
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int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
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{
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int retval;
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unsigned long flags;
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struct zfcp_adapter *adapter = port->adapter;
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write_lock_irqsave(&adapter->erp_lock, flags);
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retval = _zfcp_erp_port_reopen(port, clear, id);
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write_unlock_irqrestore(&adapter->erp_lock, flags);
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return retval;
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}
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static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
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{
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zfcp_erp_clear_lun_status(sdev,
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ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask);
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}
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static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
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u32 act_status)
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{
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
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zfcp_erp_lun_block(sdev, clear);
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if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
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return;
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zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
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zfcp_sdev->port, sdev, id, act_status);
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}
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/**
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* zfcp_erp_lun_reopen - initiate reopen of a LUN
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* @sdev: SCSI device / LUN to be reopened
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* @clear_mask: specifies flags in LUN status to be cleared
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* @id: Id for debug trace event.
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*
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* Return: 0 on success, < 0 on error
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*/
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void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id)
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{
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unsigned long flags;
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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struct zfcp_port *port = zfcp_sdev->port;
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struct zfcp_adapter *adapter = port->adapter;
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write_lock_irqsave(&adapter->erp_lock, flags);
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_zfcp_erp_lun_reopen(sdev, clear, id, 0);
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write_unlock_irqrestore(&adapter->erp_lock, flags);
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}
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/**
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* zfcp_erp_lun_shutdown - Shutdown LUN
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* @sdev: SCSI device / LUN to shut down.
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* @clear: Status flags to clear.
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* @id: Id for debug trace event.
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*/
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void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id)
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{
|
|
int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
|
|
zfcp_erp_lun_reopen(sdev, clear | flags, id);
|
|
}
|
|
|
|
/**
|
|
* zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion
|
|
* @sdev: SCSI device / LUN to shut down.
|
|
* @id: Id for debug trace event.
|
|
*
|
|
* Do not acquire a reference for the LUN when creating the ERP
|
|
* action. It is safe, because this function waits for the ERP to
|
|
* complete first. This allows to shutdown the LUN, even when the SCSI
|
|
* device is in the state SDEV_DEL when scsi_device_get will fail.
|
|
*/
|
|
void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
|
|
{
|
|
unsigned long flags;
|
|
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
|
|
struct zfcp_port *port = zfcp_sdev->port;
|
|
struct zfcp_adapter *adapter = port->adapter;
|
|
int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
|
|
|
|
write_lock_irqsave(&adapter->erp_lock, flags);
|
|
_zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
|
|
write_unlock_irqrestore(&adapter->erp_lock, flags);
|
|
|
|
zfcp_erp_wait(adapter);
|
|
}
|
|
|
|
static int status_change_set(unsigned long mask, atomic_t *status)
|
|
{
|
|
return (atomic_read(status) ^ mask) & mask;
|
|
}
|
|
|
|
static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
|
|
{
|
|
if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
|
|
zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
|
|
}
|
|
|
|
static void zfcp_erp_port_unblock(struct zfcp_port *port)
|
|
{
|
|
if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
|
|
zfcp_dbf_rec_run("erpubl1", &port->erp_action);
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
|
|
}
|
|
|
|
static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
|
|
{
|
|
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
|
|
|
|
if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
|
|
zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
|
|
}
|
|
|
|
static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
|
|
{
|
|
list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
|
|
zfcp_dbf_rec_run("erator1", erp_action);
|
|
}
|
|
|
|
static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
|
|
{
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
struct zfcp_fsf_req *req;
|
|
|
|
if (!act->fsf_req_id)
|
|
return;
|
|
|
|
spin_lock(&adapter->req_list->lock);
|
|
req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
|
|
if (req && req->erp_action == act) {
|
|
if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
|
|
ZFCP_STATUS_ERP_TIMEDOUT)) {
|
|
req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
|
|
zfcp_dbf_rec_run("erscf_1", act);
|
|
req->erp_action = NULL;
|
|
}
|
|
if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
|
|
zfcp_dbf_rec_run("erscf_2", act);
|
|
if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
|
|
act->fsf_req_id = 0;
|
|
} else
|
|
act->fsf_req_id = 0;
|
|
spin_unlock(&adapter->req_list->lock);
|
|
}
|
|
|
|
/**
|
|
* zfcp_erp_notify - Trigger ERP action.
|
|
* @erp_action: ERP action to continue.
|
|
* @set_mask: ERP action status flags to set.
|
|
*/
|
|
void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
|
|
{
|
|
struct zfcp_adapter *adapter = erp_action->adapter;
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&adapter->erp_lock, flags);
|
|
if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
|
|
erp_action->status |= set_mask;
|
|
zfcp_erp_action_ready(erp_action);
|
|
}
|
|
write_unlock_irqrestore(&adapter->erp_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
|
|
* @data: ERP action (from timer data)
|
|
*/
|
|
void zfcp_erp_timeout_handler(unsigned long data)
|
|
{
|
|
struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
|
|
zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
|
|
}
|
|
|
|
static void zfcp_erp_memwait_handler(unsigned long data)
|
|
{
|
|
zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
|
|
}
|
|
|
|
static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
|
|
{
|
|
init_timer(&erp_action->timer);
|
|
erp_action->timer.function = zfcp_erp_memwait_handler;
|
|
erp_action->timer.data = (unsigned long) erp_action;
|
|
erp_action->timer.expires = jiffies + HZ;
|
|
add_timer(&erp_action->timer);
|
|
}
|
|
|
|
static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
|
|
int clear, char *id)
|
|
{
|
|
struct zfcp_port *port;
|
|
|
|
read_lock(&adapter->port_list_lock);
|
|
list_for_each_entry(port, &adapter->port_list, list)
|
|
_zfcp_erp_port_reopen(port, clear, id);
|
|
read_unlock(&adapter->port_list_lock);
|
|
}
|
|
|
|
static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
|
|
char *id)
|
|
{
|
|
struct scsi_device *sdev;
|
|
|
|
shost_for_each_device(sdev, port->adapter->scsi_host)
|
|
if (sdev_to_zfcp(sdev)->port == port)
|
|
_zfcp_erp_lun_reopen(sdev, clear, id, 0);
|
|
}
|
|
|
|
static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
|
|
{
|
|
switch (act->action) {
|
|
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
|
|
_zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1");
|
|
break;
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
|
|
_zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2");
|
|
break;
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT:
|
|
_zfcp_erp_port_reopen(act->port, 0, "ersff_3");
|
|
break;
|
|
case ZFCP_ERP_ACTION_REOPEN_LUN:
|
|
_zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
|
|
{
|
|
switch (act->action) {
|
|
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
|
|
_zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1");
|
|
break;
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
|
|
_zfcp_erp_port_reopen(act->port, 0, "ersfs_2");
|
|
break;
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT:
|
|
_zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
|
|
{
|
|
unsigned long flags;
|
|
|
|
read_lock_irqsave(&adapter->erp_lock, flags);
|
|
if (list_empty(&adapter->erp_ready_head) &&
|
|
list_empty(&adapter->erp_running_head)) {
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
|
|
&adapter->status);
|
|
wake_up(&adapter->erp_done_wqh);
|
|
}
|
|
read_unlock_irqrestore(&adapter->erp_lock, flags);
|
|
}
|
|
|
|
static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
|
|
{
|
|
struct zfcp_port *port;
|
|
port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
|
|
adapter->peer_d_id);
|
|
if (IS_ERR(port)) /* error or port already attached */
|
|
return;
|
|
_zfcp_erp_port_reopen(port, 0, "ereptp1");
|
|
}
|
|
|
|
static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
|
|
{
|
|
int retries;
|
|
int sleep = 1;
|
|
struct zfcp_adapter *adapter = erp_action->adapter;
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
|
|
|
|
for (retries = 7; retries; retries--) {
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
|
|
&adapter->status);
|
|
write_lock_irq(&adapter->erp_lock);
|
|
zfcp_erp_action_to_running(erp_action);
|
|
write_unlock_irq(&adapter->erp_lock);
|
|
if (zfcp_fsf_exchange_config_data(erp_action)) {
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
|
|
&adapter->status);
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
|
|
wait_event(adapter->erp_ready_wq,
|
|
!list_empty(&adapter->erp_ready_head));
|
|
if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
|
|
break;
|
|
|
|
if (!(atomic_read(&adapter->status) &
|
|
ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
|
|
break;
|
|
|
|
ssleep(sleep);
|
|
sleep *= 2;
|
|
}
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
|
|
&adapter->status);
|
|
|
|
if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
|
|
zfcp_erp_enqueue_ptp_port(adapter);
|
|
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
|
|
static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
|
|
{
|
|
int ret;
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
|
|
write_lock_irq(&adapter->erp_lock);
|
|
zfcp_erp_action_to_running(act);
|
|
write_unlock_irq(&adapter->erp_lock);
|
|
|
|
ret = zfcp_fsf_exchange_port_data(act);
|
|
if (ret == -EOPNOTSUPP)
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
if (ret)
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
zfcp_dbf_rec_run("erasox1", act);
|
|
wait_event(adapter->erp_ready_wq,
|
|
!list_empty(&adapter->erp_ready_head));
|
|
zfcp_dbf_rec_run("erasox2", act);
|
|
if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
|
|
static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
|
|
{
|
|
if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
if (mempool_resize(act->adapter->pool.sr_data,
|
|
act->adapter->stat_read_buf_num, GFP_KERNEL))
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
if (mempool_resize(act->adapter->pool.status_read_req,
|
|
act->adapter->stat_read_buf_num, GFP_KERNEL))
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
|
|
if (zfcp_status_read_refill(act->adapter))
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
|
|
static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
|
|
{
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
|
|
/* close queues to ensure that buffers are not accessed by adapter */
|
|
zfcp_qdio_close(adapter->qdio);
|
|
zfcp_fsf_req_dismiss_all(adapter);
|
|
adapter->fsf_req_seq_no = 0;
|
|
zfcp_fc_wka_ports_force_offline(adapter->gs);
|
|
/* all ports and LUNs are closed */
|
|
zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN);
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
|
|
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
|
|
}
|
|
|
|
static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
|
|
{
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
|
|
if (zfcp_qdio_open(adapter->qdio)) {
|
|
atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
|
|
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
|
|
&adapter->status);
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
|
|
if (zfcp_erp_adapter_strategy_open_fsf(act)) {
|
|
zfcp_erp_adapter_strategy_close(act);
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
|
|
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
|
|
static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
|
|
{
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
|
|
if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
|
|
zfcp_erp_adapter_strategy_close(act);
|
|
if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
|
|
return ZFCP_ERP_EXIT;
|
|
}
|
|
|
|
if (zfcp_erp_adapter_strategy_open(act)) {
|
|
ssleep(8);
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
|
|
static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
|
|
{
|
|
int retval;
|
|
|
|
retval = zfcp_fsf_close_physical_port(act);
|
|
if (retval == -ENOMEM)
|
|
return ZFCP_ERP_NOMEM;
|
|
act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
|
|
if (retval)
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
return ZFCP_ERP_CONTINUES;
|
|
}
|
|
|
|
static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
|
|
{
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
|
|
}
|
|
|
|
static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
|
|
{
|
|
struct zfcp_port *port = erp_action->port;
|
|
int status = atomic_read(&port->status);
|
|
|
|
switch (erp_action->step) {
|
|
case ZFCP_ERP_STEP_UNINITIALIZED:
|
|
zfcp_erp_port_strategy_clearstati(port);
|
|
if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
|
|
(status & ZFCP_STATUS_COMMON_OPEN))
|
|
return zfcp_erp_port_forced_strategy_close(erp_action);
|
|
else
|
|
return ZFCP_ERP_FAILED;
|
|
|
|
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
|
|
if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
|
|
static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
|
|
{
|
|
int retval;
|
|
|
|
retval = zfcp_fsf_close_port(erp_action);
|
|
if (retval == -ENOMEM)
|
|
return ZFCP_ERP_NOMEM;
|
|
erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
|
|
if (retval)
|
|
return ZFCP_ERP_FAILED;
|
|
return ZFCP_ERP_CONTINUES;
|
|
}
|
|
|
|
static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
|
|
{
|
|
int retval;
|
|
|
|
retval = zfcp_fsf_open_port(erp_action);
|
|
if (retval == -ENOMEM)
|
|
return ZFCP_ERP_NOMEM;
|
|
erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
|
|
if (retval)
|
|
return ZFCP_ERP_FAILED;
|
|
return ZFCP_ERP_CONTINUES;
|
|
}
|
|
|
|
static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
|
|
{
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
struct zfcp_port *port = act->port;
|
|
|
|
if (port->wwpn != adapter->peer_wwpn) {
|
|
zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
port->d_id = adapter->peer_d_id;
|
|
return zfcp_erp_port_strategy_open_port(act);
|
|
}
|
|
|
|
static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
|
|
{
|
|
struct zfcp_adapter *adapter = act->adapter;
|
|
struct zfcp_port *port = act->port;
|
|
int p_status = atomic_read(&port->status);
|
|
|
|
switch (act->step) {
|
|
case ZFCP_ERP_STEP_UNINITIALIZED:
|
|
case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
|
|
case ZFCP_ERP_STEP_PORT_CLOSING:
|
|
if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
|
|
return zfcp_erp_open_ptp_port(act);
|
|
if (!port->d_id) {
|
|
zfcp_fc_trigger_did_lookup(port);
|
|
return ZFCP_ERP_EXIT;
|
|
}
|
|
return zfcp_erp_port_strategy_open_port(act);
|
|
|
|
case ZFCP_ERP_STEP_PORT_OPENING:
|
|
/* D_ID might have changed during open */
|
|
if (p_status & ZFCP_STATUS_COMMON_OPEN) {
|
|
if (!port->d_id) {
|
|
zfcp_fc_trigger_did_lookup(port);
|
|
return ZFCP_ERP_EXIT;
|
|
}
|
|
return ZFCP_ERP_SUCCEEDED;
|
|
}
|
|
if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
|
|
port->d_id = 0;
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
/* fall through otherwise */
|
|
}
|
|
return ZFCP_ERP_FAILED;
|
|
}
|
|
|
|
static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
|
|
{
|
|
struct zfcp_port *port = erp_action->port;
|
|
int p_status = atomic_read(&port->status);
|
|
|
|
if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
|
|
!(p_status & ZFCP_STATUS_COMMON_OPEN))
|
|
goto close_init_done;
|
|
|
|
switch (erp_action->step) {
|
|
case ZFCP_ERP_STEP_UNINITIALIZED:
|
|
zfcp_erp_port_strategy_clearstati(port);
|
|
if (p_status & ZFCP_STATUS_COMMON_OPEN)
|
|
return zfcp_erp_port_strategy_close(erp_action);
|
|
break;
|
|
|
|
case ZFCP_ERP_STEP_PORT_CLOSING:
|
|
if (p_status & ZFCP_STATUS_COMMON_OPEN)
|
|
return ZFCP_ERP_FAILED;
|
|
break;
|
|
}
|
|
|
|
close_init_done:
|
|
if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
|
|
return ZFCP_ERP_EXIT;
|
|
|
|
return zfcp_erp_port_strategy_open_common(erp_action);
|
|
}
|
|
|
|
static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
|
|
{
|
|
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
|
|
ZFCP_STATUS_LUN_SHARED | ZFCP_STATUS_LUN_READONLY,
|
|
&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_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
|
|
&zfcp_sdev->status);
|
|
break;
|
|
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT:
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
|
|
&erp_action->port->status);
|
|
break;
|
|
|
|
case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
|
|
&erp_action->adapter->status);
|
|
break;
|
|
}
|
|
}
|
|
|
|
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);
|
|
break;
|
|
|
|
case ZFCP_ERP_ACTION_REOPEN_PORT:
|
|
if (result == ZFCP_ERP_SUCCEEDED)
|
|
zfcp_scsi_schedule_rport_register(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_set_mask(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_set_mask(common_mask, &port->status);
|
|
read_unlock_irqrestore(&adapter->port_list_lock, flags);
|
|
|
|
shost_for_each_device(sdev, adapter->scsi_host)
|
|
atomic_set_mask(common_mask, &sdev_to_zfcp(sdev)->status);
|
|
}
|
|
|
|
/**
|
|
* 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_clear_mask(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_clear_mask(common_mask, &port->status);
|
|
if (clear_counter)
|
|
atomic_set(&port->erp_counter, 0);
|
|
}
|
|
read_unlock_irqrestore(&adapter->port_list_lock, flags);
|
|
|
|
shost_for_each_device(sdev, adapter->scsi_host) {
|
|
atomic_clear_mask(common_mask, &sdev_to_zfcp(sdev)->status);
|
|
if (clear_counter)
|
|
atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
atomic_set_mask(mask, &port->status);
|
|
|
|
if (!common_mask)
|
|
return;
|
|
|
|
shost_for_each_device(sdev, port->adapter->scsi_host)
|
|
if (sdev_to_zfcp(sdev)->port == port)
|
|
atomic_set_mask(common_mask,
|
|
&sdev_to_zfcp(sdev)->status);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
atomic_clear_mask(mask, &port->status);
|
|
|
|
if (!common_mask)
|
|
return;
|
|
|
|
if (clear_counter)
|
|
atomic_set(&port->erp_counter, 0);
|
|
|
|
shost_for_each_device(sdev, port->adapter->scsi_host)
|
|
if (sdev_to_zfcp(sdev)->port == port) {
|
|
atomic_clear_mask(common_mask,
|
|
&sdev_to_zfcp(sdev)->status);
|
|
if (clear_counter)
|
|
atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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_set_mask(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_clear_mask(mask, &zfcp_sdev->status);
|
|
|
|
if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
|
|
atomic_set(&zfcp_sdev->erp_counter, 0);
|
|
}
|
|
|