drivers/s390/cio/device.h

   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 /*
   9  * states of the device statemachine
  10  */
  11 enum dev_state {
  12         DEV_STATE_NOT_OPER,
  13         DEV_STATE_SENSE_PGID,
  14         DEV_STATE_SENSE_ID,
  15         DEV_STATE_OFFLINE,
  16         DEV_STATE_VERIFY,
  17         DEV_STATE_ONLINE,
  18         DEV_STATE_W4SENSE,
  19         DEV_STATE_DISBAND_PGID,
  20         DEV_STATE_BOXED,
  21         /* states to wait for i/o completion before doing something */
  22         DEV_STATE_CLEAR_VERIFY,
  23         DEV_STATE_TIMEOUT_KILL,
  24         DEV_STATE_QUIESCE,
  25         /* special states for devices gone not operational */
  26         DEV_STATE_DISCONNECTED,
  27         DEV_STATE_DISCONNECTED_SENSE_ID,
  28         DEV_STATE_CMFCHANGE,
  29         DEV_STATE_CMFUPDATE,
  30         /* last element! */
  31         NR_DEV_STATES
  32 };
  33
  34 /*
  35  * asynchronous events of the device statemachine
  36  */
  37 enum dev_event {
  38         DEV_EVENT_NOTOPER,
  39         DEV_EVENT_INTERRUPT,
  40         DEV_EVENT_TIMEOUT,
  41         DEV_EVENT_VERIFY,
  42         /* last element! */
  43         NR_DEV_EVENTS
  44 };
  45
  46 struct ccw_device;
  47
  48 /*
  49  * action called through jumptable
  50  */
  51 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
  52 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
  53
  54 static inline void
  55 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
  56 {
  57         dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
  58 }
  59
  60 /*
  61  * Delivers 1 if the device state is final.
  62  */
  63 static inline int
  64 dev_fsm_final_state(struct ccw_device *cdev)
  65 {
  66         return (cdev->private->state == DEV_STATE_NOT_OPER ||
  67                 cdev->private->state == DEV_STATE_OFFLINE ||
  68                 cdev->private->state == DEV_STATE_ONLINE ||
  69                 cdev->private->state == DEV_STATE_BOXED);
  70 }
  71
  72 extern struct workqueue_struct *ccw_device_work;
  73 extern struct workqueue_struct *ccw_device_notify_work;
  74 extern wait_queue_head_t ccw_device_init_wq;
  75 extern atomic_t ccw_device_init_count;
  76
  77 void io_subchannel_recog_done(struct ccw_device *cdev);
  78
  79 int ccw_device_cancel_halt_clear(struct ccw_device *);
  80
  81 void ccw_device_do_unreg_rereg(struct work_struct *);
  82 void ccw_device_call_sch_unregister(struct work_struct *);
  83
  84 int ccw_device_recognition(struct ccw_device *);
  85 int ccw_device_online(struct ccw_device *);
  86 int ccw_device_offline(struct ccw_device *);
  87
  88 /* Function prototypes for device status and basic sense stuff. */
  89 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
  90 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
  91 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
  92 int ccw_device_do_sense(struct ccw_device *, struct irb *);
  93
  94 /* Function prototypes for sense id stuff. */
  95 void ccw_device_sense_id_start(struct ccw_device *);
  96 void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
  97 void ccw_device_sense_id_done(struct ccw_device *, int);
  98
  99 /* Function prototypes for path grouping stuff. */
 100 void ccw_device_sense_pgid_start(struct ccw_device *);
 101 void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
 102 void ccw_device_sense_pgid_done(struct ccw_device *, int);
 103
 104 void ccw_device_verify_start(struct ccw_device *);
 105 void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
 106 void ccw_device_verify_done(struct ccw_device *, int);
 107
 108 void ccw_device_disband_start(struct ccw_device *);
 109 void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
 110 void ccw_device_disband_done(struct ccw_device *, int);
 111
 112 int ccw_device_call_handler(struct ccw_device *);
 113
 114 int ccw_device_stlck(struct ccw_device *);
 115
 116 /* qdio needs this. */
 117 void ccw_device_set_timeout(struct ccw_device *, int);
 118 extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
 119
 120 /* Channel measurement facility related */
 121 void retry_set_schib(struct ccw_device *cdev);
 122 void cmf_retry_copy_block(struct ccw_device *);
 123 int cmf_reenable(struct ccw_device *);
 124 #endif