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 #include <linux/notifier.h>
   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_TIMEOUT_KILL,
  25         DEV_STATE_QUIESCE,
  26         /* special states for devices gone not operational */
  27         DEV_STATE_DISCONNECTED,
  28         DEV_STATE_DISCONNECTED_SENSE_ID,
  29         DEV_STATE_CMFCHANGE,
  30         DEV_STATE_CMFUPDATE,
  31         DEV_STATE_STEAL_LOCK,
  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 wait_queue_head_t ccw_device_init_wq;
  75 extern atomic_t ccw_device_init_count;
  76 int __init io_subchannel_init(void);
  77
  78 void io_subchannel_recog_done(struct ccw_device *cdev);
  79 void io_subchannel_init_config(struct subchannel *sch);
  80
  81 int ccw_device_cancel_halt_clear(struct ccw_device *);
  82
  83 int ccw_device_is_orphan(struct ccw_device *);
  84
  85 void ccw_device_recognition(struct ccw_device *);
  86 int ccw_device_online(struct ccw_device *);
  87 int ccw_device_offline(struct ccw_device *);
  88 void ccw_device_update_sense_data(struct ccw_device *);
  89 int ccw_device_test_sense_data(struct ccw_device *);
  90 void ccw_device_schedule_sch_unregister(struct ccw_device *);
  91 int ccw_purge_blacklisted(void);
  92 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
  93
  94 /* Function prototypes for device status and basic sense stuff. */
  95 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
  96 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
  97 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
  98 int ccw_device_do_sense(struct ccw_device *, struct irb *);
  99
 100 /* Function prototype for internal request handling. */
 101 int lpm_adjust(int lpm, int mask);
 102 void ccw_request_start(struct ccw_device *);
 103 int ccw_request_cancel(struct ccw_device *cdev);
 104 void ccw_request_handler(struct ccw_device *cdev);
 105 void ccw_request_timeout(struct ccw_device *cdev);
 106 void ccw_request_notoper(struct ccw_device *cdev);
 107
 108 /* Function prototypes for sense id stuff. */
 109 void ccw_device_sense_id_start(struct ccw_device *);
 110 void ccw_device_sense_id_done(struct ccw_device *, int);
 111
 112 /* Function prototypes for path grouping stuff. */
 113 void ccw_device_verify_start(struct ccw_device *);
 114 void ccw_device_verify_done(struct ccw_device *, int);
 115
 116 void ccw_device_disband_start(struct ccw_device *);
 117 void ccw_device_disband_done(struct ccw_device *, int);
 118
 119 void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
 120 void ccw_device_stlck_done(struct ccw_device *, void *, int);
 121
 122 int ccw_device_call_handler(struct ccw_device *);
 123
 124 int ccw_device_stlck(struct ccw_device *);
 125
 126 /* Helper function for machine check handling. */
 127 void ccw_device_trigger_reprobe(struct ccw_device *);
 128 void ccw_device_kill_io(struct ccw_device *);
 129 int ccw_device_notify(struct ccw_device *, int);
 130 void ccw_device_set_disconnected(struct ccw_device *cdev);
 131 void ccw_device_set_notoper(struct ccw_device *cdev);
 132
 133 /* qdio needs this. */
 134 void ccw_device_set_timeout(struct ccw_device *, int);
 135 extern struct subchannel_id ccw_device_get_subchannel_id(struct ccw_device *);
 136
 137 /* Channel measurement facility related */
 138 void retry_set_schib(struct ccw_device *cdev);
 139 void cmf_retry_copy_block(struct ccw_device *);
 140 int cmf_reenable(struct ccw_device *);
 141 int ccw_set_cmf(struct ccw_device *cdev, int enable);
 142 extern struct device_attribute dev_attr_cmb_enable;
 143 #endif