device.h revision 40154b824331cd9c81c06545761338f3d80a36e2 
1#ifndef S390_DEVICE_H
2#define S390_DEVICE_H
3
4#include <asm/ccwdev.h>
5#include <asm/atomic.h>
6#include <linux/wait.h>
7
8/*
9 * states of the device statemachine
10 */
11enum dev_state {
12	DEV_STATE_NOT_OPER,
13	DEV_STATE_SENSE_PGID,
14	DEV_STATE_SENSE_ID,
15	DEV_STATE_OFFLINE,
16	DEV_STATE_VERIFY,
17	DEV_STATE_ONLINE,
18	DEV_STATE_W4SENSE,
19	DEV_STATE_DISBAND_PGID,
20	DEV_STATE_BOXED,
21	/* states to wait for i/o completion before doing something */
22	DEV_STATE_CLEAR_VERIFY,
23	DEV_STATE_TIMEOUT_KILL,
24	DEV_STATE_WAIT4IO,
25	DEV_STATE_QUIESCE,
26	/* special states for devices gone not operational */
27	DEV_STATE_DISCONNECTED,
28	DEV_STATE_DISCONNECTED_SENSE_ID,
29	DEV_STATE_CMFCHANGE,
30	/* last element! */
31	NR_DEV_STATES
32};
33
34/*
35 * asynchronous events of the device statemachine
36 */
37enum dev_event {
38	DEV_EVENT_NOTOPER,
39	DEV_EVENT_INTERRUPT,
40	DEV_EVENT_TIMEOUT,
41	DEV_EVENT_VERIFY,
42	/* last element! */
43	NR_DEV_EVENTS
44};
45
46struct ccw_device;
47
48/*
49 * action called through jumptable
50 */
51typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
52extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
53
54static inline void
55dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
56{
57	dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
58}
59
60/*
61 * Delivers 1 if the device state is final.
62 */
63static inline int
64dev_fsm_final_state(struct ccw_device *cdev)
65{
66	return (cdev->private->state == DEV_STATE_NOT_OPER ||
67		cdev->private->state == DEV_STATE_OFFLINE ||
68		cdev->private->state == DEV_STATE_ONLINE ||
69		cdev->private->state == DEV_STATE_BOXED);
70}
71
72extern struct workqueue_struct *ccw_device_work;
73extern struct workqueue_struct *ccw_device_notify_work;
74extern wait_queue_head_t ccw_device_init_wq;
75extern atomic_t ccw_device_init_count;
76
77void io_subchannel_recog_done(struct ccw_device *cdev);
78
79int ccw_device_cancel_halt_clear(struct ccw_device *);
80
81int ccw_device_register(struct ccw_device *);
82void ccw_device_do_unreg_rereg(void *);
83void ccw_device_call_sch_unregister(void *);
84
85int ccw_device_recognition(struct ccw_device *);
86int ccw_device_online(struct ccw_device *);
87int ccw_device_offline(struct ccw_device *);
88
89/* Function prototypes for device status and basic sense stuff. */
90void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
91void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
92int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
93int ccw_device_do_sense(struct ccw_device *, struct irb *);
94
95/* Function prototypes for sense id stuff. */
96void ccw_device_sense_id_start(struct ccw_device *);
97void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
98void ccw_device_sense_id_done(struct ccw_device *, int);
99
100/* Function prototypes for path grouping stuff. */
101void ccw_device_sense_pgid_start(struct ccw_device *);
102void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
103void ccw_device_sense_pgid_done(struct ccw_device *, int);
104
105void ccw_device_verify_start(struct ccw_device *);
106void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
107void ccw_device_verify_done(struct ccw_device *, int);
108
109void ccw_device_disband_start(struct ccw_device *);
110void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
111void ccw_device_disband_done(struct ccw_device *, int);
112
113int ccw_device_call_handler(struct ccw_device *);
114
115int ccw_device_stlck(struct ccw_device *);
116
117/* qdio needs this. */
118void ccw_device_set_timeout(struct ccw_device *, int);
119extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
120
121void retry_set_schib(struct ccw_device *cdev);
122#endif
123