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 */
13 enum 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 */
39 enum 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
48 struct ccw_device;
49
50 /*
51 * action called through jumptable
52 */
53 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
54 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
55
56 static inline void
57 dev_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 */
65 static inline int
66 dev_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
74 extern struct workqueue_struct *ccw_device_work;
75 extern struct workqueue_struct *ccw_device_notify_work;
76 extern wait_queue_head_t ccw_device_init_wq;
77 extern atomic_t ccw_device_init_count;
78
79 void io_subchannel_recog_done(struct ccw_device *cdev);
80
81 int ccw_device_cancel_halt_clear(struct ccw_device *);
82
83 void ccw_device_do_unreg_rereg(struct work_struct *);
84 void ccw_device_move_to_orphanage(struct work_struct *);
85 int ccw_device_is_orphan(struct ccw_device *);
86
87 int ccw_device_recognition(struct ccw_device *);
88 int ccw_device_online(struct ccw_device *);
89 int ccw_device_offline(struct ccw_device *);
90
91 void ccw_device_schedule_recovery(void);
92
93 /* Function prototypes for device status and basic sense stuff. */
94 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
95 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
96 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
97 int ccw_device_do_sense(struct ccw_device *, struct irb *);
98
99 /* Function prototypes for sense id stuff. */
100 void ccw_device_sense_id_start(struct ccw_device *);
101 void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
102 void ccw_device_sense_id_done(struct ccw_device *, int);
103
104 /* Function prototypes for path grouping stuff. */
105 void ccw_device_sense_pgid_start(struct ccw_device *);
106 void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
107 void ccw_device_sense_pgid_done(struct ccw_device *, int);
108
109 void ccw_device_verify_start(struct ccw_device *);
110 void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
111 void ccw_device_verify_done(struct ccw_device *, int);
112
113 void ccw_device_disband_start(struct ccw_device *);
114 void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
115 void ccw_device_disband_done(struct ccw_device *, int);
116
117 int ccw_device_call_handler(struct ccw_device *);
118
119 int ccw_device_stlck(struct ccw_device *);
120
121 /* qdio needs this. */
122 void ccw_device_set_timeout(struct ccw_device *, int);
123 extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
124 extern struct bus_type ccw_bus_type;
125
126 /* Channel measurement facility related */
127 void retry_set_schib(struct ccw_device *cdev);
128 void cmf_retry_copy_block(struct ccw_device *);
129 int cmf_reenable(struct ccw_device *);
130 #endif
131
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