device.h revision d7d12ef2befac4fed0dccaddff11338b654804df 
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	DEV_STATE_STEAL_LOCK,
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;
77int __init io_subchannel_init(void);
78
79void io_subchannel_recog_done(struct ccw_device *cdev);
80void io_subchannel_init_config(struct subchannel *sch);
81
82int ccw_device_cancel_halt_clear(struct ccw_device *);
83
84int ccw_device_is_orphan(struct ccw_device *);
85
86void ccw_device_recognition(struct ccw_device *);
87int ccw_device_online(struct ccw_device *);
88int ccw_device_offline(struct ccw_device *);
89void ccw_device_update_sense_data(struct ccw_device *);
90int ccw_device_test_sense_data(struct ccw_device *);
91void ccw_device_schedule_sch_unregister(struct ccw_device *);
92int ccw_purge_blacklisted(void);
93void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
94
95/* Function prototypes for device status and basic sense stuff. */
96void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
97void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
98int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
99int ccw_device_do_sense(struct ccw_device *, struct irb *);
100
101/* Function prototype for internal request handling. */
102int lpm_adjust(int lpm, int mask);
103void ccw_request_start(struct ccw_device *);
104int ccw_request_cancel(struct ccw_device *cdev);
105void ccw_request_handler(struct ccw_device *cdev);
106void ccw_request_timeout(struct ccw_device *cdev);
107void ccw_request_notoper(struct ccw_device *cdev);
108
109/* Function prototypes for sense id stuff. */
110void ccw_device_sense_id_start(struct ccw_device *);
111void ccw_device_sense_id_done(struct ccw_device *, int);
112
113/* Function prototypes for path grouping stuff. */
114void ccw_device_verify_start(struct ccw_device *);
115void ccw_device_verify_done(struct ccw_device *, int);
116
117void ccw_device_disband_start(struct ccw_device *);
118void ccw_device_disband_done(struct ccw_device *, int);
119
120void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
121void ccw_device_stlck_done(struct ccw_device *, void *, int);
122
123int ccw_device_call_handler(struct ccw_device *);
124
125int ccw_device_stlck(struct ccw_device *);
126
127/* Helper function for machine check handling. */
128void ccw_device_trigger_reprobe(struct ccw_device *);
129void ccw_device_kill_io(struct ccw_device *);
130int ccw_device_notify(struct ccw_device *, int);
131void ccw_device_set_disconnected(struct ccw_device *cdev);
132void ccw_device_set_notoper(struct ccw_device *cdev);
133
134/* qdio needs this. */
135void ccw_device_set_timeout(struct ccw_device *, int);
136extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
137extern struct bus_type ccw_bus_type;
138
139/* Channel measurement facility related */
140void retry_set_schib(struct ccw_device *cdev);
141void cmf_retry_copy_block(struct ccw_device *);
142int cmf_reenable(struct ccw_device *);
143int ccw_set_cmf(struct ccw_device *cdev, int enable);
144extern struct device_attribute dev_attr_cmb_enable;
145#endif
146