drivers/s390/cio/device.h

   1 #ifndef S390_DEVICE_H
   2 #define S390_DEVICE_H
   3
   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>
   9 #include "io_sch.h"
  10
  11 /*
  12  * states of the device statemachine
  13  */
  14 enum dev_state {
  15         DEV_STATE_NOT_OPER,
  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         int state = cdev->private->state;
  60
  61         if (dev_event == DEV_EVENT_INTERRUPT) {
  62                 if (state == DEV_STATE_ONLINE)
  63                         inc_irq_stat(cdev->private->int_class);
  64                 else if (state != DEV_STATE_CMFCHANGE &&
  65                          state != DEV_STATE_CMFUPDATE)
  66                         inc_irq_stat(IRQIO_CIO);
  67         }
  68         dev_jumptable[state][dev_event](cdev, dev_event);
  69 }
  70
  71 /*
  72  * Delivers 1 if the device state is final.
  73  */
  74 static inline int
  75 dev_fsm_final_state(struct ccw_device *cdev)
  76 {
  77         return (cdev->private->state == DEV_STATE_NOT_OPER ||
  78                 cdev->private->state == DEV_STATE_OFFLINE ||
  79                 cdev->private->state == DEV_STATE_ONLINE ||
  80                 cdev->private->state == DEV_STATE_BOXED);
  81 }
  82
  83 int __init io_subchannel_init(void);
  84
  85 void io_subchannel_recog_done(struct ccw_device *cdev);
  86 void io_subchannel_init_config(struct subchannel *sch);
  87
  88 int ccw_device_cancel_halt_clear(struct ccw_device *);
  89
  90 int ccw_device_is_orphan(struct ccw_device *);
  91
  92 void ccw_device_recognition(struct ccw_device *);
  93 int ccw_device_online(struct ccw_device *);
  94 int ccw_device_offline(struct ccw_device *);
  95 void ccw_device_update_sense_data(struct ccw_device *);
  96 int ccw_device_test_sense_data(struct ccw_device *);
  97 void ccw_device_schedule_sch_unregister(struct ccw_device *);
  98 int ccw_purge_blacklisted(void);
  99 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
 100 struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
 101
 102 /* Function prototypes for device status and basic sense stuff. */
 103 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
 104 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
 105 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
 106 int ccw_device_do_sense(struct ccw_device *, struct irb *);
 107
 108 /* Function prototype for internal request handling. */
 109 int lpm_adjust(int lpm, int mask);
 110 void ccw_request_start(struct ccw_device *);
 111 int ccw_request_cancel(struct ccw_device *cdev);
 112 void ccw_request_handler(struct ccw_device *cdev);
 113 void ccw_request_timeout(struct ccw_device *cdev);
 114 void ccw_request_notoper(struct ccw_device *cdev);
 115
 116 /* Function prototypes for sense id stuff. */
 117 void ccw_device_sense_id_start(struct ccw_device *);
 118 void ccw_device_sense_id_done(struct ccw_device *, int);
 119
 120 /* Function prototypes for path grouping stuff. */
 121 void ccw_device_verify_start(struct ccw_device *);
 122 void ccw_device_verify_done(struct ccw_device *, int);
 123
 124 void ccw_device_disband_start(struct ccw_device *);
 125 void ccw_device_disband_done(struct ccw_device *, int);
 126
 127 int ccw_device_stlck(struct ccw_device *);
 128
 129 /* Helper function for machine check handling. */
 130 void ccw_device_trigger_reprobe(struct ccw_device *);
 131 void ccw_device_kill_io(struct ccw_device *);
 132 int ccw_device_notify(struct ccw_device *, int);
 133 void ccw_device_set_disconnected(struct ccw_device *cdev);
 134 void ccw_device_set_notoper(struct ccw_device *cdev);
 135
 136 void ccw_device_set_timeout(struct ccw_device *, int);
 137
 138 /* Channel measurement facility related */
 139 void retry_set_schib(struct ccw_device *cdev);
 140 void cmf_retry_copy_block(struct ccw_device *);
 141 int cmf_reenable(struct ccw_device *);
 142 void cmf_reactivate(void);
 143 int ccw_set_cmf(struct ccw_device *cdev, int enable);
 144 extern struct device_attribute dev_attr_cmb_enable;
 145 #endif