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_PGID,
  17         DEV_STATE_SENSE_ID,
  18         DEV_STATE_OFFLINE,
  19         DEV_STATE_VERIFY,
  20         DEV_STATE_ONLINE,
  21         DEV_STATE_W4SENSE,
  22         DEV_STATE_DISBAND_PGID,
  23         DEV_STATE_BOXED,
  24         /* states to wait for i/o completion before doing something */
  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         DEV_STATE_STEAL_LOCK,
  33         /* last element! */
  34         NR_DEV_STATES
  35 };
  36
  37 /*
  38  * asynchronous events of the device statemachine
  39  */
  40 enum dev_event {
  41         DEV_EVENT_NOTOPER,
  42         DEV_EVENT_INTERRUPT,
  43         DEV_EVENT_TIMEOUT,
  44         DEV_EVENT_VERIFY,
  45         /* last element! */
  46         NR_DEV_EVENTS
  47 };
  48
  49 struct ccw_device;
  50
  51 /*
  52  * action called through jumptable
  53  */
  54 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
  55 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
  56
  57 static inline void
  58 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
  59 {
  60         int state = cdev->private->state;
  61
  62         if (dev_event == DEV_EVENT_INTERRUPT) {
  63                 if (state == DEV_STATE_ONLINE)
  64                         kstat_cpu(smp_processor_id()).
  65                                 irqs[cdev->private->int_class]++;
  66                 else if (state != DEV_STATE_CMFCHANGE &&
  67                          state != DEV_STATE_CMFUPDATE)
  68                         kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++;
  69         }
  70         dev_jumptable[state][dev_event](cdev, dev_event);
  71 }
  72
  73 /*
  74  * Delivers 1 if the device state is final.
  75  */
  76 static inline int
  77 dev_fsm_final_state(struct ccw_device *cdev)
  78 {
  79         return (cdev->private->state == DEV_STATE_NOT_OPER ||
  80                 cdev->private->state == DEV_STATE_OFFLINE ||
  81                 cdev->private->state == DEV_STATE_ONLINE ||
  82                 cdev->private->state == DEV_STATE_BOXED);
  83 }
  84
  85 extern wait_queue_head_t ccw_device_init_wq;
  86 extern atomic_t ccw_device_init_count;
  87 int __init io_subchannel_init(void);
  88
  89 void io_subchannel_recog_done(struct ccw_device *cdev);
  90 void io_subchannel_init_config(struct subchannel *sch);
  91
  92 int ccw_device_cancel_halt_clear(struct ccw_device *);
  93
  94 int ccw_device_is_orphan(struct ccw_device *);
  95
  96 void ccw_device_recognition(struct ccw_device *);
  97 int ccw_device_online(struct ccw_device *);
  98 int ccw_device_offline(struct ccw_device *);
  99 void ccw_device_update_sense_data(struct ccw_device *);
 100 int ccw_device_test_sense_data(struct ccw_device *);
 101 void ccw_device_schedule_sch_unregister(struct ccw_device *);
 102 int ccw_purge_blacklisted(void);
 103 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
 104 struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
 105
 106 /* Function prototypes for device status and basic sense stuff. */
 107 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
 108 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
 109 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
 110 int ccw_device_do_sense(struct ccw_device *, struct irb *);
 111
 112 /* Function prototype for internal request handling. */
 113 int lpm_adjust(int lpm, int mask);
 114 void ccw_request_start(struct ccw_device *);
 115 int ccw_request_cancel(struct ccw_device *cdev);
 116 void ccw_request_handler(struct ccw_device *cdev);
 117 void ccw_request_timeout(struct ccw_device *cdev);
 118 void ccw_request_notoper(struct ccw_device *cdev);
 119
 120 /* Function prototypes for sense id stuff. */
 121 void ccw_device_sense_id_start(struct ccw_device *);
 122 void ccw_device_sense_id_done(struct ccw_device *, int);
 123
 124 /* Function prototypes for path grouping stuff. */
 125 void ccw_device_verify_start(struct ccw_device *);
 126 void ccw_device_verify_done(struct ccw_device *, int);
 127
 128 void ccw_device_disband_start(struct ccw_device *);
 129 void ccw_device_disband_done(struct ccw_device *, int);
 130
 131 void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
 132 void ccw_device_stlck_done(struct ccw_device *, void *, int);
 133
 134 int ccw_device_call_handler(struct ccw_device *);
 135
 136 int ccw_device_stlck(struct ccw_device *);
 137
 138 /* Helper function for machine check handling. */
 139 void ccw_device_trigger_reprobe(struct ccw_device *);
 140 void ccw_device_kill_io(struct ccw_device *);
 141 int ccw_device_notify(struct ccw_device *, int);
 142 void ccw_device_set_disconnected(struct ccw_device *cdev);
 143 void ccw_device_set_notoper(struct ccw_device *cdev);
 144
 145 void ccw_device_set_timeout(struct ccw_device *, int);
 146
 147 /* Channel measurement facility related */
 148 void retry_set_schib(struct ccw_device *cdev);
 149 void cmf_retry_copy_block(struct ccw_device *);
 150 int cmf_reenable(struct ccw_device *);
 151 int ccw_set_cmf(struct ccw_device *cdev, int enable);
 152 extern struct device_attribute dev_attr_cmb_enable;
 153 #endif