LXR linux/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 */
  14enum 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 */
  40enum 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
  49struct ccw_device;
  50
  51/*
  52 * action called through jumptable
  53 */
  54typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
  55extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
  56
  57static inline void
  58dev_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                        inc_irq_stat(cdev->private->int_class);
  65                else if (state != DEV_STATE_CMFCHANGE &&
  66                         state != DEV_STATE_CMFUPDATE)
  67                        inc_irq_stat(IRQIO_CIO);
  68        }
  69        dev_jumptable[state][dev_event](cdev, dev_event);
  70}
  71
  72/*
  73 * Delivers 1 if the device state is final.
  74 */
  75static inline int
  76dev_fsm_final_state(struct ccw_device *cdev)
  77{
  78        return (cdev->private->state == DEV_STATE_NOT_OPER ||
  79                cdev->private->state == DEV_STATE_OFFLINE ||
  80                cdev->private->state == DEV_STATE_ONLINE ||
  81                cdev->private->state == DEV_STATE_BOXED);
  82}
  83
  84int __init io_subchannel_init(void);
  85
  86void io_subchannel_recog_done(struct ccw_device *cdev);
  87void io_subchannel_init_config(struct subchannel *sch);
  88
  89int ccw_device_cancel_halt_clear(struct ccw_device *);
  90
  91int ccw_device_is_orphan(struct ccw_device *);
  92
  93void ccw_device_recognition(struct ccw_device *);
  94int ccw_device_online(struct ccw_device *);
  95int ccw_device_offline(struct ccw_device *);
  96void ccw_device_update_sense_data(struct ccw_device *);
  97int ccw_device_test_sense_data(struct ccw_device *);
  98void ccw_device_schedule_sch_unregister(struct ccw_device *);
  99int ccw_purge_blacklisted(void);
 100void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
 101struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
 102
 103/* Function prototypes for device status and basic sense stuff. */
 104void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
 105void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
 106int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
 107int ccw_device_do_sense(struct ccw_device *, struct irb *);
 108
 109/* Function prototype for internal request handling. */
 110int lpm_adjust(int lpm, int mask);
 111void ccw_request_start(struct ccw_device *);
 112int ccw_request_cancel(struct ccw_device *cdev);
 113void ccw_request_handler(struct ccw_device *cdev);
 114void ccw_request_timeout(struct ccw_device *cdev);
 115void ccw_request_notoper(struct ccw_device *cdev);
 116
 117/* Function prototypes for sense id stuff. */
 118void ccw_device_sense_id_start(struct ccw_device *);
 119void ccw_device_sense_id_done(struct ccw_device *, int);
 120
 121/* Function prototypes for path grouping stuff. */
 122void ccw_device_verify_start(struct ccw_device *);
 123void ccw_device_verify_done(struct ccw_device *, int);
 124
 125void ccw_device_disband_start(struct ccw_device *);
 126void ccw_device_disband_done(struct ccw_device *, int);
 127
 128void ccw_device_stlck_start(struct ccw_device *, void *, void *, void *);
 129void ccw_device_stlck_done(struct ccw_device *, void *, int);
 130
 131int ccw_device_call_handler(struct ccw_device *);
 132
 133int ccw_device_stlck(struct ccw_device *);
 134
 135/* Helper function for machine check handling. */
 136void ccw_device_trigger_reprobe(struct ccw_device *);
 137void ccw_device_kill_io(struct ccw_device *);
 138int ccw_device_notify(struct ccw_device *, int);
 139void ccw_device_set_disconnected(struct ccw_device *cdev);
 140void ccw_device_set_notoper(struct ccw_device *cdev);
 141
 142void ccw_device_set_timeout(struct ccw_device *, int);
 143
 144/* Channel measurement facility related */
 145void retry_set_schib(struct ccw_device *cdev);
 146void cmf_retry_copy_block(struct ccw_device *);
 147int cmf_reenable(struct ccw_device *);
 148int ccw_set_cmf(struct ccw_device *cdev, int enable);
 149extern struct device_attribute dev_attr_cmb_enable;
 150#endif
 151