device.h revision 91c36919a456589f4f073671474a1f899e0d3c2b 
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#include "io_sch.h"
9
10/*
11 * states of the device statemachine
12 */
13enum dev_state {
14	DEV_STATE_NOT_OPER,
15	DEV_STATE_SENSE_PGID,
16	DEV_STATE_SENSE_ID,
17	DEV_STATE_OFFLINE,
18	DEV_STATE_VERIFY,
19	DEV_STATE_ONLINE,
20	DEV_STATE_W4SENSE,
21	DEV_STATE_DISBAND_PGID,
22	DEV_STATE_BOXED,
23	/* states to wait for i/o completion before doing something */
24	DEV_STATE_CLEAR_VERIFY,
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	/* last element! */
33	NR_DEV_STATES
34};
35
36/*
37 * asynchronous events of the device statemachine
38 */
39enum dev_event {
40	DEV_EVENT_NOTOPER,
41	DEV_EVENT_INTERRUPT,
42	DEV_EVENT_TIMEOUT,
43	DEV_EVENT_VERIFY,
44	/* last element! */
45	NR_DEV_EVENTS
46};
47
48struct ccw_device;
49
50/*
51 * action called through jumptable
52 */
53typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
54extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
55
56static inline void
57dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
58{
59	dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
60}
61
62/*
63 * Delivers 1 if the device state is final.
64 */
65static inline int
66dev_fsm_final_state(struct ccw_device *cdev)
67{
68	return (cdev->private->state == DEV_STATE_NOT_OPER ||
69		cdev->private->state == DEV_STATE_OFFLINE ||
70		cdev->private->state == DEV_STATE_ONLINE ||
71		cdev->private->state == DEV_STATE_BOXED);
72}
73
74extern struct workqueue_struct *ccw_device_work;
75extern wait_queue_head_t ccw_device_init_wq;
76extern atomic_t ccw_device_init_count;
77
78void io_subchannel_recog_done(struct ccw_device *cdev);
79
80int ccw_device_cancel_halt_clear(struct ccw_device *);
81
82void ccw_device_do_unreg_rereg(struct work_struct *);
83void ccw_device_move_to_orphanage(struct work_struct *);
84int ccw_device_is_orphan(struct ccw_device *);
85
86int ccw_device_recognition(struct ccw_device *);
87int ccw_device_online(struct ccw_device *);
88int ccw_device_offline(struct ccw_device *);
89
90/* Function prototypes for device status and basic sense stuff. */
91void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
92void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
93int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
94int ccw_device_do_sense(struct ccw_device *, struct irb *);
95
96/* Function prototypes for sense id stuff. */
97void ccw_device_sense_id_start(struct ccw_device *);
98void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
99void ccw_device_sense_id_done(struct ccw_device *, int);
100
101/* Function prototypes for path grouping stuff. */
102void ccw_device_sense_pgid_start(struct ccw_device *);
103void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
104void ccw_device_sense_pgid_done(struct ccw_device *, int);
105
106void ccw_device_verify_start(struct ccw_device *);
107void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
108void ccw_device_verify_done(struct ccw_device *, int);
109
110void ccw_device_disband_start(struct ccw_device *);
111void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
112void ccw_device_disband_done(struct ccw_device *, int);
113
114int ccw_device_call_handler(struct ccw_device *);
115
116int ccw_device_stlck(struct ccw_device *);
117
118/* Helper function for machine check handling. */
119void ccw_device_trigger_reprobe(struct ccw_device *);
120void ccw_device_kill_io(struct ccw_device *);
121int ccw_device_notify(struct ccw_device *, int);
122void ccw_device_set_notoper(struct ccw_device *cdev);
123
124/* qdio needs this. */
125void ccw_device_set_timeout(struct ccw_device *, int);
126extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
127extern struct bus_type ccw_bus_type;
128
129/* Channel measurement facility related */
130void retry_set_schib(struct ccw_device *cdev);
131void cmf_retry_copy_block(struct ccw_device *);
132int cmf_reenable(struct ccw_device *);
133extern struct device_attribute dev_attr_cmb_enable;
134#endif
135