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 #include "io_sch.h"
   9
  10 /*
  11  * states of the device statemachine
  12  */
  13 enum dev_state {
  14         DEV_STATE_NOT_OPER,
  15         DEV_STATE_SENSE_PGID,
  16         DEV_STATE_SENSE_ID,
  17         DEV_STATE_OFFLINE,
  18         DEV_STATE_VERIFY,
  19         DEV_STATE_ONLINE,
  20         DEV_STATE_W4SENSE,
  21         DEV_STATE_DISBAND_PGID,
  22         DEV_STATE_BOXED,
  23         /* states to wait for i/o completion before doing something */
  24         DEV_STATE_CLEAR_VERIFY,
  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         /* last element! */
  33         NR_DEV_STATES
  34 };
  35
  36 /*
  37  * asynchronous events of the device statemachine
  38  */
  39 enum dev_event {
  40         DEV_EVENT_NOTOPER,
  41         DEV_EVENT_INTERRUPT,
  42         DEV_EVENT_TIMEOUT,
  43         DEV_EVENT_VERIFY,
  44         /* last element! */
  45         NR_DEV_EVENTS
  46 };
  47
  48 struct ccw_device;
  49
  50 /*
  51  * action called through jumptable
  52  */
  53 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
  54 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
  55
  56 static inline void
  57 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
  58 {
  59         dev_jumptable[cdev->private->state][dev_event](cdev, dev_event);
  60 }
  61
  62 /*
  63  * Delivers 1 if the device state is final.
  64  */
  65 static inline int
  66 dev_fsm_final_state(struct ccw_device *cdev)
  67 {
  68         return (cdev->private->state == DEV_STATE_NOT_OPER ||
  69                 cdev->private->state == DEV_STATE_OFFLINE ||
  70                 cdev->private->state == DEV_STATE_ONLINE ||
  71                 cdev->private->state == DEV_STATE_BOXED);
  72 }
  73
  74 extern struct workqueue_struct *ccw_device_work;
  75 extern struct workqueue_struct *ccw_device_notify_work;
  76 extern wait_queue_head_t ccw_device_init_wq;
  77 extern atomic_t ccw_device_init_count;
  78
  79 void io_subchannel_recog_done(struct ccw_device *cdev);
  80
  81 int ccw_device_cancel_halt_clear(struct ccw_device *);
  82
  83 void ccw_device_do_unreg_rereg(struct work_struct *);
  84 void ccw_device_move_to_orphanage(struct work_struct *);
  85 int ccw_device_is_orphan(struct ccw_device *);
  86
  87 int ccw_device_recognition(struct ccw_device *);
  88 int ccw_device_online(struct ccw_device *);
  89 int ccw_device_offline(struct ccw_device *);
  90
  91 void ccw_device_schedule_recovery(void);
  92
  93 /* Function prototypes for device status and basic sense stuff. */
  94 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
  95 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
  96 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
  97 int ccw_device_do_sense(struct ccw_device *, struct irb *);
  98
  99 /* Function prototypes for sense id stuff. */
 100 void ccw_device_sense_id_start(struct ccw_device *);
 101 void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
 102 void ccw_device_sense_id_done(struct ccw_device *, int);
 103
 104 /* Function prototypes for path grouping stuff. */
 105 void ccw_device_sense_pgid_start(struct ccw_device *);
 106 void ccw_device_sense_pgid_irq(struct ccw_device *, enum dev_event);
 107 void ccw_device_sense_pgid_done(struct ccw_device *, int);
 108
 109 void ccw_device_verify_start(struct ccw_device *);
 110 void ccw_device_verify_irq(struct ccw_device *, enum dev_event);
 111 void ccw_device_verify_done(struct ccw_device *, int);
 112
 113 void ccw_device_disband_start(struct ccw_device *);
 114 void ccw_device_disband_irq(struct ccw_device *, enum dev_event);
 115 void ccw_device_disband_done(struct ccw_device *, int);
 116
 117 int ccw_device_call_handler(struct ccw_device *);
 118
 119 int ccw_device_stlck(struct ccw_device *);
 120
 121 /* qdio needs this. */
 122 void ccw_device_set_timeout(struct ccw_device *, int);
 123 extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
 124 extern struct bus_type ccw_bus_type;
 125
 126 /* Channel measurement facility related */
 127 void retry_set_schib(struct ccw_device *cdev);
 128 void cmf_retry_copy_block(struct ccw_device *);
 129 int cmf_reenable(struct ccw_device *);
 130 #endif