xref: /openbmc/linux/drivers/s390/cio/device.h (revision 9cfc5c90) 
1 #ifndef S390_DEVICE_H
2 #define S390_DEVICE_H
3 
4 #include <asm/ccwdev.h>
5 #include <linux/atomic.h>
6 #include <linux/wait.h>
7 #include <linux/notifier.h>
8 #include <linux/kernel_stat.h>
9 #include "io_sch.h"
10 
11 /*
12  * states of the device statemachine
13  */
14 enum dev_state {
15 	DEV_STATE_NOT_OPER,
16 	DEV_STATE_SENSE_PGID,
17 	DEV_STATE_SENSE_ID,
18 	DEV_STATE_OFFLINE,
19 	DEV_STATE_VERIFY,
20 	DEV_STATE_ONLINE,
21 	DEV_STATE_W4SENSE,
22 	DEV_STATE_DISBAND_PGID,
23 	DEV_STATE_BOXED,
24 	/* states to wait for i/o completion before doing something */
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 	DEV_STATE_STEAL_LOCK,
33 	/* last element! */
34 	NR_DEV_STATES
35 };
36 
37 /*
38  * asynchronous events of the device statemachine
39  */
40 enum dev_event {
41 	DEV_EVENT_NOTOPER,
42 	DEV_EVENT_INTERRUPT,
43 	DEV_EVENT_TIMEOUT,
44 	DEV_EVENT_VERIFY,
45 	/* last element! */
46 	NR_DEV_EVENTS
47 };
48 
49 struct ccw_device;
50 
51 /*
52  * action called through jumptable
53  */
54 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
55 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
56 
57 static inline void
58 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
59 {
60 	int state = cdev->private->state;
61 
62 	if (dev_event == DEV_EVENT_INTERRUPT) {
63 		if (state == DEV_STATE_ONLINE)
64 			inc_irq_stat(cdev->private->int_class);
65 		else if (state != DEV_STATE_CMFCHANGE &&
66 			 state != DEV_STATE_CMFUPDATE)
67 			inc_irq_stat(IRQIO_CIO);
68 	}
69 	dev_jumptable[state][dev_event](cdev, dev_event);
70 }
71 
72 /*
73  * Delivers 1 if the device state is final.
74  */
75 static inline int
76 dev_fsm_final_state(struct ccw_device *cdev)
77 {
78 	return (cdev->private->state == DEV_STATE_NOT_OPER ||
79 		cdev->private->state == DEV_STATE_OFFLINE ||
80 		cdev->private->state == DEV_STATE_ONLINE ||
81 		cdev->private->state == DEV_STATE_BOXED);
82 }
83 
84 int __init io_subchannel_init(void);
85 
86 void io_subchannel_recog_done(struct ccw_device *cdev);
87 void io_subchannel_init_config(struct subchannel *sch);
88 
89 int ccw_device_cancel_halt_clear(struct ccw_device *);
90 
91 int ccw_device_is_orphan(struct ccw_device *);
92 
93 void ccw_device_recognition(struct ccw_device *);
94 int ccw_device_online(struct ccw_device *);
95 int ccw_device_offline(struct ccw_device *);
96 void ccw_device_update_sense_data(struct ccw_device *);
97 int ccw_device_test_sense_data(struct ccw_device *);
98 void ccw_device_schedule_sch_unregister(struct ccw_device *);
99 int ccw_purge_blacklisted(void);
100 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
101 struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
102 
103 /* Function prototypes for device status and basic sense stuff. */
104 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
105 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
106 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
107 int ccw_device_do_sense(struct ccw_device *, struct irb *);
108 
109 /* Function prototype for internal request handling. */
110 int lpm_adjust(int lpm, int mask);
111 void ccw_request_start(struct ccw_device *);
112 int ccw_request_cancel(struct ccw_device *cdev);
113 void ccw_request_handler(struct ccw_device *cdev);
114 void ccw_request_timeout(struct ccw_device *cdev);
115 void ccw_request_notoper(struct ccw_device *cdev);
116 
117 /* Function prototypes for sense id stuff. */
118 void ccw_device_sense_id_start(struct ccw_device *);
119 void ccw_device_sense_id_done(struct ccw_device *, int);
120 
121 /* Function prototypes for path grouping stuff. */
122 void ccw_device_verify_start(struct ccw_device *);
123 void ccw_device_verify_done(struct ccw_device *, int);
124 
125 void ccw_device_disband_start(struct ccw_device *);
126 void ccw_device_disband_done(struct ccw_device *, int);
127 
128 int ccw_device_stlck(struct ccw_device *);
129 
130 /* Helper function for machine check handling. */
131 void ccw_device_trigger_reprobe(struct ccw_device *);
132 void ccw_device_kill_io(struct ccw_device *);
133 int ccw_device_notify(struct ccw_device *, int);
134 void ccw_device_set_disconnected(struct ccw_device *cdev);
135 void ccw_device_set_notoper(struct ccw_device *cdev);
136 
137 void ccw_device_set_timeout(struct ccw_device *, int);
138 
139 /* Channel measurement facility related */
140 void retry_set_schib(struct ccw_device *cdev);
141 void cmf_retry_copy_block(struct ccw_device *);
142 int cmf_reenable(struct ccw_device *);
143 void cmf_reactivate(void);
144 int ccw_set_cmf(struct ccw_device *cdev, int enable);
145 extern struct device_attribute dev_attr_cmb_enable;
146 #endif
147