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>
12 * states of the device statemachine
22 DEV_STATE_DISBAND_PGID,
24 /* states to wait for i/o completion before doing something */
25 DEV_STATE_TIMEOUT_KILL,
27 /* special states for devices gone not operational */
28 DEV_STATE_DISCONNECTED,
29 DEV_STATE_DISCONNECTED_SENSE_ID,
38 * asynchronous events of the device statemachine
52 * action called through jumptable
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];
58 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
60 int state = cdev->private->state;
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);
69 dev_jumptable[state][dev_event](cdev, dev_event);
73 * Delivers 1 if the device state is final.
76 dev_fsm_final_state(struct ccw_device *cdev)
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);
84 extern wait_queue_head_t ccw_device_init_wq;
85 extern atomic_t ccw_device_init_count;
86 int __init io_subchannel_init(void);
88 void io_subchannel_recog_done(struct ccw_device *cdev);
89 void io_subchannel_init_config(struct subchannel *sch);
91 int ccw_device_cancel_halt_clear(struct ccw_device *);
93 int ccw_device_is_orphan(struct ccw_device *);
95 void ccw_device_recognition(struct ccw_device *);
96 int ccw_device_online(struct ccw_device *);
97 int ccw_device_offline(struct ccw_device *);
98 void ccw_device_update_sense_data(struct ccw_device *);
99 int ccw_device_test_sense_data(struct ccw_device *);
100 void ccw_device_schedule_sch_unregister(struct ccw_device *);
101 int ccw_purge_blacklisted(void);
102 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
103 struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
105 /* Function prototypes for device status and basic sense stuff. */
106 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
107 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
108 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
109 int ccw_device_do_sense(struct ccw_device *, struct irb *);
111 /* Function prototype for internal request handling. */
112 int lpm_adjust(int lpm, int mask);
113 void ccw_request_start(struct ccw_device *);
114 int ccw_request_cancel(struct ccw_device *cdev);
115 void ccw_request_handler(struct ccw_device *cdev);
116 void ccw_request_timeout(struct ccw_device *cdev);
117 void ccw_request_notoper(struct ccw_device *cdev);
119 /* Function prototypes for sense id stuff. */
120 void ccw_device_sense_id_start(struct ccw_device *);
121 void ccw_device_sense_id_done(struct ccw_device *, int);
123 /* Function prototypes for path grouping stuff. */
124 void ccw_device_verify_start(struct ccw_device *);
125 void ccw_device_verify_done(struct ccw_device *, int);
127 void ccw_device_disband_start(struct ccw_device *);
128 void ccw_device_disband_done(struct ccw_device *, int);
130 void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
131 void ccw_device_stlck_done(struct ccw_device *, void *, int);
133 int ccw_device_call_handler(struct ccw_device *);
135 int ccw_device_stlck(struct ccw_device *);
137 /* Helper function for machine check handling. */
138 void ccw_device_trigger_reprobe(struct ccw_device *);
139 void ccw_device_kill_io(struct ccw_device *);
140 int ccw_device_notify(struct ccw_device *, int);
141 void ccw_device_set_disconnected(struct ccw_device *cdev);
142 void ccw_device_set_notoper(struct ccw_device *cdev);
144 void ccw_device_set_timeout(struct ccw_device *, int);
146 /* Channel measurement facility related */
147 void retry_set_schib(struct ccw_device *cdev);
148 void cmf_retry_copy_block(struct ccw_device *);
149 int cmf_reenable(struct ccw_device *);
150 int ccw_set_cmf(struct ccw_device *cdev, int enable);
151 extern struct device_attribute dev_attr_cmb_enable;