1#ifndef S390_DEVICE_H
2#define S390_DEVICE_H
3
4#include <asm/ccwdev.h>
5#include <linux/atomic.h>
6#include <linux/wait.h>
7#include <linux/notifier.h>
8#include <linux/kernel_stat.h>
9#include "io_sch.h"
10
11/*
12 * states of the device statemachine
13 */
14enum dev_state {
15	DEV_STATE_NOT_OPER,
16	DEV_STATE_SENSE_PGID,
17	DEV_STATE_SENSE_ID,
18	DEV_STATE_OFFLINE,
19	DEV_STATE_VERIFY,
20	DEV_STATE_ONLINE,
21	DEV_STATE_W4SENSE,
22	DEV_STATE_DISBAND_PGID,
23	DEV_STATE_BOXED,
24	/* states to wait for i/o completion before doing something */
25	DEV_STATE_TIMEOUT_KILL,
26	DEV_STATE_QUIESCE,
27	/* special states for devices gone not operational */
28	DEV_STATE_DISCONNECTED,
29	DEV_STATE_DISCONNECTED_SENSE_ID,
30	DEV_STATE_CMFCHANGE,
31	DEV_STATE_CMFUPDATE,
32	DEV_STATE_STEAL_LOCK,
33	/* last element! */
34	NR_DEV_STATES
35};
36
37/*
38 * asynchronous events of the device statemachine
39 */
40enum dev_event {
41	DEV_EVENT_NOTOPER,
42	DEV_EVENT_INTERRUPT,
43	DEV_EVENT_TIMEOUT,
44	DEV_EVENT_VERIFY,
45	/* last element! */
46	NR_DEV_EVENTS
47};
48
49struct ccw_device;
50
51/*
52 * action called through jumptable
53 */
54typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
55extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
56
57static inline void
58dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
59{
60	int state = cdev->private->state;
61
62	if (dev_event == DEV_EVENT_INTERRUPT) {
63		if (state == DEV_STATE_ONLINE)
64			inc_irq_stat(cdev->private->int_class);
65		else if (state != DEV_STATE_CMFCHANGE &&
66			 state != DEV_STATE_CMFUPDATE)
67			inc_irq_stat(IRQIO_CIO);
68	}
69	dev_jumptable[state][dev_event](cdev, dev_event);
70}
71
72/*
73 * Delivers 1 if the device state is final.
74 */
75static inline int
76dev_fsm_final_state(struct ccw_device *cdev)
77{
78	return (cdev->private->state == DEV_STATE_NOT_OPER ||
79		cdev->private->state == DEV_STATE_OFFLINE ||
80		cdev->private->state == DEV_STATE_ONLINE ||
81		cdev->private->state == DEV_STATE_BOXED);
82}
83
84int __init io_subchannel_init(void);
85
86void io_subchannel_recog_done(struct ccw_device *cdev);
87void io_subchannel_init_config(struct subchannel *sch);
88
89int ccw_device_cancel_halt_clear(struct ccw_device *);
90
91int ccw_device_is_orphan(struct ccw_device *);
92
93void ccw_device_recognition(struct ccw_device *);
94int ccw_device_online(struct ccw_device *);
95int ccw_device_offline(struct ccw_device *);
96void ccw_device_update_sense_data(struct ccw_device *);
97int ccw_device_test_sense_data(struct ccw_device *);
98void ccw_device_schedule_sch_unregister(struct ccw_device *);
99int ccw_purge_blacklisted(void);
100void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
101struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
102
103/* Function prototypes for device status and basic sense stuff. */
104void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
105void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
106int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
107int ccw_device_do_sense(struct ccw_device *, struct irb *);
108
109/* Function prototype for internal request handling. */
110int lpm_adjust(int lpm, int mask);
111void ccw_request_start(struct ccw_device *);
112int ccw_request_cancel(struct ccw_device *cdev);
113void ccw_request_handler(struct ccw_device *cdev);
114void ccw_request_timeout(struct ccw_device *cdev);
115void ccw_request_notoper(struct ccw_device *cdev);
116
117/* Function prototypes for sense id stuff. */
118void ccw_device_sense_id_start(struct ccw_device *);
119void ccw_device_sense_id_done(struct ccw_device *, int);
120
121/* Function prototypes for path grouping stuff. */
122void ccw_device_verify_start(struct ccw_device *);
123void ccw_device_verify_done(struct ccw_device *, int);
124
125void ccw_device_disband_start(struct ccw_device *);
126void ccw_device_disband_done(struct ccw_device *, int);
127
128void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
129void ccw_device_stlck_done(struct ccw_device *, void *, int);
130
131int ccw_device_call_handler(struct ccw_device *);
132
133int ccw_device_stlck(struct ccw_device *);
134
135/* Helper function for machine check handling. */
136void ccw_device_trigger_reprobe(struct ccw_device *);
137void ccw_device_kill_io(struct ccw_device *);
138int ccw_device_notify(struct ccw_device *, int);
139void ccw_device_set_disconnected(struct ccw_device *cdev);
140void ccw_device_set_notoper(struct ccw_device *cdev);
141
142void ccw_device_set_timeout(struct ccw_device *, int);
143
144/* Channel measurement facility related */
145void retry_set_schib(struct ccw_device *cdev);
146void cmf_retry_copy_block(struct ccw_device *);
147int cmf_reenable(struct ccw_device *);
148int ccw_set_cmf(struct ccw_device *cdev, int enable);
149extern struct device_attribute dev_attr_cmb_enable;
150#endif
151