device.h revision 52ef0608e3ee4a511725e443c4b572fece22b353 
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_TIMEOUT_KILL,
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	DEV_STATE_CMFUPDATE,
31	/* last element! */
32	NR_DEV_STATES
33};
34
35/*
36 * asynchronous events of the device statemachine
37 */
38enum dev_event {
39	DEV_EVENT_NOTOPER,
40	DEV_EVENT_INTERRUPT,
41	DEV_EVENT_TIMEOUT,
42	DEV_EVENT_VERIFY,
43	/* last element! */
44	NR_DEV_EVENTS
45};
46
47struct ccw_device;
48
49/*
50 * action called through jumptable
51 */
52typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
53extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
54
55static inline void
56dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
57{
58	dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
59}
60
61/*
62 * Delivers 1 if the device state is final.
63 */
64static inline int
65dev_fsm_final_state(struct ccw_device *cdev)
66{
67	return (cdev->private->state == DEV_STATE_NOT_OPER ||
68		cdev->private->state == DEV_STATE_OFFLINE ||
69		cdev->private->state == DEV_STATE_ONLINE ||
70		cdev->private->state == DEV_STATE_BOXED);
71}
72
73extern struct workqueue_struct *ccw_device_work;
74extern wait_queue_head_t ccw_device_init_wq;
75extern atomic_t ccw_device_init_count;
76int __init io_subchannel_init(void);
77
78void io_subchannel_recog_done(struct ccw_device *cdev);
79void io_subchannel_init_config(struct subchannel *sch);
80
81int ccw_device_cancel_halt_clear(struct ccw_device *);
82
83int ccw_device_is_orphan(struct ccw_device *);
84
85void ccw_device_recognition(struct ccw_device *);
86int ccw_device_online(struct ccw_device *);
87int ccw_device_offline(struct ccw_device *);
88void ccw_device_update_sense_data(struct ccw_device *);
89int ccw_device_test_sense_data(struct ccw_device *);
90void ccw_device_schedule_sch_unregister(struct ccw_device *);
91int ccw_purge_blacklisted(void);
92void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
93
94/* Function prototypes for device status and basic sense stuff. */
95void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
96void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
97int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
98int ccw_device_do_sense(struct ccw_device *, struct irb *);
99
100/* Function prototype for internal request handling. */
101int lpm_adjust(int lpm, int mask);
102void ccw_request_start(struct ccw_device *);
103int ccw_request_cancel(struct ccw_device *cdev);
104void ccw_request_handler(struct ccw_device *cdev);
105void ccw_request_timeout(struct ccw_device *cdev);
106void ccw_request_notoper(struct ccw_device *cdev);
107
108/* Function prototypes for sense id stuff. */
109void ccw_device_sense_id_start(struct ccw_device *);
110void ccw_device_sense_id_done(struct ccw_device *, int);
111
112/* Function prototypes for path grouping stuff. */
113void ccw_device_verify_start(struct ccw_device *);
114void ccw_device_verify_done(struct ccw_device *, int);
115
116void ccw_device_disband_start(struct ccw_device *);
117void ccw_device_disband_done(struct ccw_device *, int);
118
119int ccw_device_call_handler(struct ccw_device *);
120
121int ccw_device_stlck(struct ccw_device *);
122
123/* Helper function for machine check handling. */
124void ccw_device_trigger_reprobe(struct ccw_device *);
125void ccw_device_kill_io(struct ccw_device *);
126int ccw_device_notify(struct ccw_device *, int);
127void ccw_device_set_disconnected(struct ccw_device *cdev);
128void ccw_device_set_notoper(struct ccw_device *cdev);
129
130/* qdio needs this. */
131void ccw_device_set_timeout(struct ccw_device *, int);
132extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
133extern struct bus_type ccw_bus_type;
134
135/* Channel measurement facility related */
136void retry_set_schib(struct ccw_device *cdev);
137void cmf_retry_copy_block(struct ccw_device *);
138int cmf_reenable(struct ccw_device *);
139int ccw_set_cmf(struct ccw_device *cdev, int enable);
140extern struct device_attribute dev_attr_cmb_enable;
141#endif
142