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147 lines
4.4 KiB
147 lines
4.4 KiB
/* 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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