148 lines
4.4 KiB
C
148 lines
4.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#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 <linux/atomic.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/notifier.h>
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#include <linux/kernel_stat.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_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_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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DEV_STATE_STEAL_LOCK,
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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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int state = cdev->private->state;
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if (dev_event == DEV_EVENT_INTERRUPT) {
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if (state == DEV_STATE_ONLINE)
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inc_irq_stat(cdev->private->int_class);
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else if (state != DEV_STATE_CMFCHANGE &&
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state != DEV_STATE_CMFUPDATE)
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inc_irq_stat(IRQIO_CIO);
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}
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dev_jumptable[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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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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int ccw_device_is_orphan(struct ccw_device *);
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void 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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int ccw_purge_blacklisted(void);
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void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
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struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
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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 prototype for internal request handling. */
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int lpm_adjust(int lpm, int mask);
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void ccw_request_start(struct ccw_device *);
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int ccw_request_cancel(struct ccw_device *cdev);
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void ccw_request_handler(struct ccw_device *cdev);
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void ccw_request_timeout(struct ccw_device *cdev);
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void ccw_request_notoper(struct ccw_device *cdev);
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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_done(struct ccw_device *, int);
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/* Function prototypes for path grouping stuff. */
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void ccw_device_verify_start(struct ccw_device *);
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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_done(struct ccw_device *, int);
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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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void ccw_device_timeout(struct timer_list *t);
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void ccw_device_set_timeout(struct ccw_device *, int);
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void ccw_device_schedule_recovery(void);
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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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void cmf_reactivate(void);
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extern struct device_attribute dev_attr_cmb_enable;
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#endif
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