drivers/s390/cio/device.h

   1 #ifndef S390_DEVICE_H
   2 #define S390_DEVICE_H
   3
   4 /*
   5  * states of the device statemachine
   6  */
   7 enum dev_state {
   8         DEV_STATE_NOT_OPER,
   9         DEV_STATE_SENSE_PGID,
  10         DEV_STATE_SENSE_ID,
  11         DEV_STATE_OFFLINE,
  12         DEV_STATE_VERIFY,
  13         DEV_STATE_ONLINE,
  14         DEV_STATE_W4SENSE,
  15         DEV_STATE_DISBAND_PGID,
  16         DEV_STATE_BOXED,
  17         /* states to wait for i/o completion before doing something */
  18         DEV_STATE_CLEAR_VERIFY,
  19         DEV_STATE_TIMEOUT_KILL,
  20         DEV_STATE_WAIT4IO,
  21         DEV_STATE_QUIESCE,
  22         /* special states for devices gone not operational */
  23         DEV_STATE_DISCONNECTED,
  24         DEV_STATE_DISCONNECTED_SENSE_ID,
  25         DEV_STATE_CMFCHANGE,
  26         /* last element! */
  27         NR_DEV_STATES
  28 };
  29
  30 /*
  31  * asynchronous events of the device statemachine
  32  */
  33 enum dev_event {
  34         DEV_EVENT_NOTOPER,
  35         DEV_EVENT_INTERRUPT,
  36         DEV_EVENT_TIMEOUT,
  37         DEV_EVENT_VERIFY,
  38         /* last element! */
  39         NR_DEV_EVENTS
  40 };
  41
  42 struct ccw_device;
  43
  44 /*
  45  * action called through jumptable
  46  */
  47 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
  48 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
  49
  50 static inline void
  51 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
  52 {
  53         dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
  54 }
  55
  56 /*
  57  * Delivers 1 if the device state is final.
  58  */
  59 static inline int
  60 dev_fsm_final_state(struct ccw_device *cdev)
  61 {
  62         return (cdev->private->state == DEV_STATE_NOT_OPER ||
  63                 cdev->private->state == DEV_STATE_OFFLINE ||
  64                 cdev->private->state == DEV_STATE_ONLINE ||
  65                 cdev->private->state == DEV_STATE_BOXED);
  66 }
  67
  68 extern struct workqueue_struct *ccw_device_work;
  69 extern struct workqueue_struct *ccw_device_notify_work;
  70
  71 void io_subchannel_recog_done(struct ccw_device *cdev);
  72
  73 int ccw_device_cancel_halt_clear(struct ccw_device *);
  74
  75 int ccw_device_register(struct ccw_device *);
  76 void ccw_device_do_unreg_rereg(void *);
  77 void ccw_device_call_sch_unregister(void *);
  78
  79 int ccw_device_recognition(struct ccw_device *);
  80 int ccw_device_online(struct ccw_device *);
  81 int ccw_device_offline(struct ccw_device *);
  82
  83 /* Function prototypes for device status and basic sense stuff. */
  84 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
  85 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
  86 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
  87 int ccw_device_do_sense(struct ccw_device *, struct irb *);
  88
  89 /* Function prototypes for sense id stuff. */
  90 void ccw_device_sense_id_start(struct ccw_device *);
  91 void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
  92 void ccw_device_sense_id_done(struct ccw_device *, int);
  93
  94 /* Function prototypes for path grouping stuff. */
  95 void ccw_device_sense_pgid_start(struct ccw_device *);
  96 void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
  97 void ccw_device_sense_pgid_done(struct ccw_device *, int);
  98
  99 void ccw_device_verify_start(struct ccw_device *);
 100 void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
 101 void ccw_device_verify_done(struct ccw_device *, int);
 102
 103 void ccw_device_disband_start(struct ccw_device *);
 104 void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
 105 void ccw_device_disband_done(struct ccw_device *, int);
 106
 107 int ccw_device_call_handler(struct ccw_device *);
 108
 109 int ccw_device_stlck(struct ccw_device *);
 110
 111 /* qdio needs this. */
 112 void ccw_device_set_timeout(struct ccw_device *, int);
 113
 114 void retry_set_schib(struct ccw_device *cdev);
 115 #endif