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device.h
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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  kstat_cpu(smp_processor_id()).
65  irqs[cdev->private->int_class]++;
66  else if (state != DEV_STATE_CMFCHANGE &&
67  state != DEV_STATE_CMFUPDATE)
68  kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++;
69  }
70  dev_jumptable[state][dev_event](cdev, dev_event);
71 }
72 
73 /*
74  * Delivers 1 if the device state is final.
75  */
76 static inline int
77 dev_fsm_final_state(struct ccw_device *cdev)
78 {
79  return (cdev->private->state == DEV_STATE_NOT_OPER ||
80  cdev->private->state == DEV_STATE_OFFLINE ||
81  cdev->private->state == DEV_STATE_ONLINE ||
82  cdev->private->state == DEV_STATE_BOXED);
83 }
84 
85 extern wait_queue_head_t ccw_device_init_wq;
86 extern atomic_t ccw_device_init_count;
87 int __init io_subchannel_init(void);
88 
89 void io_subchannel_recog_done(struct ccw_device *cdev);
90 void io_subchannel_init_config(struct subchannel *sch);
91 
92 int ccw_device_cancel_halt_clear(struct ccw_device *);
93 
94 int ccw_device_is_orphan(struct ccw_device *);
95 
96 void ccw_device_recognition(struct ccw_device *);
97 int ccw_device_online(struct ccw_device *);
98 int ccw_device_offline(struct ccw_device *);
99 void ccw_device_update_sense_data(struct ccw_device *);
100 int ccw_device_test_sense_data(struct ccw_device *);
101 void ccw_device_schedule_sch_unregister(struct ccw_device *);
102 int ccw_purge_blacklisted(void);
103 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
104 struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
105 
106 /* Function prototypes for device status and basic sense stuff. */
107 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
108 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
109 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
110 int ccw_device_do_sense(struct ccw_device *, struct irb *);
111 
112 /* Function prototype for internal request handling. */
113 int lpm_adjust(int lpm, int mask);
114 void ccw_request_start(struct ccw_device *);
115 int ccw_request_cancel(struct ccw_device *cdev);
116 void ccw_request_handler(struct ccw_device *cdev);
117 void ccw_request_timeout(struct ccw_device *cdev);
118 void ccw_request_notoper(struct ccw_device *cdev);
119 
120 /* Function prototypes for sense id stuff. */
121 void ccw_device_sense_id_start(struct ccw_device *);
122 void ccw_device_sense_id_done(struct ccw_device *, int);
123 
124 /* Function prototypes for path grouping stuff. */
125 void ccw_device_verify_start(struct ccw_device *);
126 void ccw_device_verify_done(struct ccw_device *, int);
127 
128 void ccw_device_disband_start(struct ccw_device *);
129 void ccw_device_disband_done(struct ccw_device *, int);
130 
131 void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
132 void ccw_device_stlck_done(struct ccw_device *, void *, int);
133 
134 int ccw_device_call_handler(struct ccw_device *);
135 
136 int ccw_device_stlck(struct ccw_device *);
137 
138 /* Helper function for machine check handling. */
139 void ccw_device_trigger_reprobe(struct ccw_device *);
140 void ccw_device_kill_io(struct ccw_device *);
141 int ccw_device_notify(struct ccw_device *, int);
142 void ccw_device_set_disconnected(struct ccw_device *cdev);
143 void ccw_device_set_notoper(struct ccw_device *cdev);
144 
145 /* qdio needs this. */
146 void ccw_device_set_timeout(struct ccw_device *, int);
147 extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
148 
149 /* Channel measurement facility related */
150 void retry_set_schib(struct ccw_device *cdev);
151 void cmf_retry_copy_block(struct ccw_device *);
152 int cmf_reenable(struct ccw_device *);
153 int ccw_set_cmf(struct ccw_device *cdev, int enable);
154 extern struct device_attribute dev_attr_cmb_enable;
155 #endif
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