6afcc775d9
When a ccw device appears not operational, inform the associated device driver and act according to the response: if the driver wants to keep the device, put it into the disconnected state. If not, or if there is no driver or if the device is not online, unregister it. This approach is consistent with no-path event handling. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
#ifndef S390_DEVICE_H
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#define S390_DEVICE_H
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#include <asm/ccwdev.h>
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#include <asm/atomic.h>
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#include <linux/wait.h>
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#include "io_sch.h"
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/*
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* states of the device statemachine
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*/
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enum dev_state {
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DEV_STATE_NOT_OPER,
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DEV_STATE_SENSE_PGID,
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DEV_STATE_SENSE_ID,
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DEV_STATE_OFFLINE,
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DEV_STATE_VERIFY,
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DEV_STATE_ONLINE,
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DEV_STATE_W4SENSE,
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DEV_STATE_DISBAND_PGID,
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DEV_STATE_BOXED,
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/* states to wait for i/o completion before doing something */
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DEV_STATE_CLEAR_VERIFY,
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DEV_STATE_TIMEOUT_KILL,
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DEV_STATE_QUIESCE,
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/* special states for devices gone not operational */
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DEV_STATE_DISCONNECTED,
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DEV_STATE_DISCONNECTED_SENSE_ID,
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DEV_STATE_CMFCHANGE,
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DEV_STATE_CMFUPDATE,
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/* last element! */
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NR_DEV_STATES
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};
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/*
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* asynchronous events of the device statemachine
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*/
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enum dev_event {
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DEV_EVENT_NOTOPER,
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DEV_EVENT_INTERRUPT,
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DEV_EVENT_TIMEOUT,
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DEV_EVENT_VERIFY,
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/* last element! */
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NR_DEV_EVENTS
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};
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struct ccw_device;
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/*
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* action called through jumptable
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*/
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typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
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extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
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static inline void
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dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
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{
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dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
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}
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/*
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* Delivers 1 if the device state is final.
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*/
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static inline int
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dev_fsm_final_state(struct ccw_device *cdev)
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{
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return (cdev->private->state == DEV_STATE_NOT_OPER ||
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cdev->private->state == DEV_STATE_OFFLINE ||
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cdev->private->state == DEV_STATE_ONLINE ||
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cdev->private->state == DEV_STATE_BOXED);
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}
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extern struct workqueue_struct *ccw_device_work;
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extern wait_queue_head_t ccw_device_init_wq;
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extern atomic_t ccw_device_init_count;
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int __init io_subchannel_init(void);
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void io_subchannel_recog_done(struct ccw_device *cdev);
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void io_subchannel_init_config(struct subchannel *sch);
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int ccw_device_cancel_halt_clear(struct ccw_device *);
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void ccw_device_do_unbind_bind(struct work_struct *);
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void ccw_device_move_to_orphanage(struct work_struct *);
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int ccw_device_is_orphan(struct ccw_device *);
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int ccw_device_recognition(struct ccw_device *);
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int ccw_device_online(struct ccw_device *);
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int ccw_device_offline(struct ccw_device *);
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void ccw_device_update_sense_data(struct ccw_device *);
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int ccw_device_test_sense_data(struct ccw_device *);
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void ccw_device_schedule_sch_unregister(struct ccw_device *);
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int ccw_purge_blacklisted(void);
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/* Function prototypes for device status and basic sense stuff. */
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void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
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void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
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int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
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int ccw_device_do_sense(struct ccw_device *, struct irb *);
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/* Function prototypes for sense id stuff. */
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void ccw_device_sense_id_start(struct ccw_device *);
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void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
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void ccw_device_sense_id_done(struct ccw_device *, int);
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/* Function prototypes for path grouping stuff. */
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void ccw_device_sense_pgid_start(struct ccw_device *);
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void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
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void ccw_device_sense_pgid_done(struct ccw_device *, int);
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void ccw_device_verify_start(struct ccw_device *);
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void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
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void ccw_device_verify_done(struct ccw_device *, int);
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void ccw_device_disband_start(struct ccw_device *);
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void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
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void ccw_device_disband_done(struct ccw_device *, int);
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int ccw_device_call_handler(struct ccw_device *);
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int ccw_device_stlck(struct ccw_device *);
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/* Helper function for machine check handling. */
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void ccw_device_trigger_reprobe(struct ccw_device *);
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void ccw_device_kill_io(struct ccw_device *);
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int ccw_device_notify(struct ccw_device *, int);
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void ccw_device_set_disconnected(struct ccw_device *cdev);
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void ccw_device_set_notoper(struct ccw_device *cdev);
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/* qdio needs this. */
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void ccw_device_set_timeout(struct ccw_device *, int);
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extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
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extern struct bus_type ccw_bus_type;
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/* Channel measurement facility related */
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void retry_set_schib(struct ccw_device *cdev);
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void cmf_retry_copy_block(struct ccw_device *);
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int cmf_reenable(struct ccw_device *);
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int ccw_set_cmf(struct ccw_device *cdev, int enable);
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extern struct device_attribute dev_attr_cmb_enable;
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#endif
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