drivers/s390/cio/device.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef S390_DEVICE_H
   3 #define S390_DEVICE_H
   4
   5 #include <asm/ccwdev.h>
   6 #include <linux/atomic.h>
   7 #include <linux/timer.h>
   8 #include <linux/wait.h>
   9 #include <linux/notifier.h>
  10 #include <linux/kernel_stat.h>
  11 #include "io_sch.h"
  12
  13 /*
  14  * states of the device statemachine
  15  */
  16 enum dev_state {
  17         DEV_STATE_NOT_OPER,
  18         DEV_STATE_SENSE_ID,
  19         DEV_STATE_OFFLINE,
  20         DEV_STATE_VERIFY,
  21         DEV_STATE_ONLINE,
  22         DEV_STATE_W4SENSE,
  23         DEV_STATE_DISBAND_PGID,
  24         DEV_STATE_BOXED,
  25         /* states to wait for i/o completion before doing something */
  26         DEV_STATE_TIMEOUT_KILL,
  27         DEV_STATE_QUIESCE,
  28         /* special states for devices gone not operational */
  29         DEV_STATE_DISCONNECTED,
  30         DEV_STATE_DISCONNECTED_SENSE_ID,
  31         DEV_STATE_CMFCHANGE,
  32         DEV_STATE_CMFUPDATE,
  33         DEV_STATE_STEAL_LOCK,
  34         /* last element! */
  35         NR_DEV_STATES
  36 };
  37
  38 /*
  39  * asynchronous events of the device statemachine
  40  */
  41 enum dev_event {
  42         DEV_EVENT_NOTOPER,
  43         DEV_EVENT_INTERRUPT,
  44         DEV_EVENT_TIMEOUT,
  45         DEV_EVENT_VERIFY,
  46         /* last element! */
  47         NR_DEV_EVENTS
  48 };
  49
  50 struct ccw_device;
  51
  52 /*
  53  * action called through jumptable
  54  */
  55 typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
  56 extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
  57
  58 static inline void
  59 dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
  60 {
  61         int state = cdev->private->state;
  62
  63         if (dev_event == DEV_EVENT_INTERRUPT) {
  64                 if (state == DEV_STATE_ONLINE)
  65                         inc_irq_stat(cdev->private->int_class);
  66                 else if (state != DEV_STATE_CMFCHANGE &&
  67                          state != DEV_STATE_CMFUPDATE)
  68                         inc_irq_stat(IRQIO_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 int __init io_subchannel_init(void);
  86
  87 void io_subchannel_recog_done(struct ccw_device *cdev);
  88 void io_subchannel_init_config(struct subchannel *sch);
  89
  90 int ccw_device_cancel_halt_clear(struct ccw_device *);
  91
  92 int ccw_device_is_orphan(struct ccw_device *);
  93
  94 void ccw_device_recognition(struct ccw_device *);
  95 int ccw_device_online(struct ccw_device *);
  96 int ccw_device_offline(struct ccw_device *);
  97 void ccw_device_update_sense_data(struct ccw_device *);
  98 int ccw_device_test_sense_data(struct ccw_device *);
  99 int ccw_purge_blacklisted(void);
 100 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
 101 struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
 102
 103 /* Function prototypes for device status and basic sense stuff. */
 104 void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
 105 void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
 106 int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
 107 int ccw_device_do_sense(struct ccw_device *, struct irb *);
 108
 109 /* Function prototype for internal request handling. */
 110 int lpm_adjust(int lpm, int mask);
 111 void ccw_request_start(struct ccw_device *);
 112 int ccw_request_cancel(struct ccw_device *cdev);
 113 void ccw_request_handler(struct ccw_device *cdev);
 114 void ccw_request_timeout(struct ccw_device *cdev);
 115 void ccw_request_notoper(struct ccw_device *cdev);
 116
 117 /* Function prototypes for sense id stuff. */
 118 void ccw_device_sense_id_start(struct ccw_device *);
 119 void ccw_device_sense_id_done(struct ccw_device *, int);
 120
 121 /* Function prototypes for path grouping stuff. */
 122 void ccw_device_verify_start(struct ccw_device *);
 123 void ccw_device_verify_done(struct ccw_device *, int);
 124
 125 void ccw_device_disband_start(struct ccw_device *);
 126 void ccw_device_disband_done(struct ccw_device *, int);
 127
 128 int ccw_device_stlck(struct ccw_device *);
 129
 130 /* Helper function for machine check handling. */
 131 void ccw_device_trigger_reprobe(struct ccw_device *);
 132 void ccw_device_kill_io(struct ccw_device *);
 133 int ccw_device_notify(struct ccw_device *, int);
 134 void ccw_device_set_disconnected(struct ccw_device *cdev);
 135 void ccw_device_set_notoper(struct ccw_device *cdev);
 136
 137 void ccw_device_timeout(struct timer_list *t);
 138 void ccw_device_set_timeout(struct ccw_device *, int);
 139 void ccw_device_schedule_recovery(void);
 140
 141 /* Channel measurement facility related */
 142 void retry_set_schib(struct ccw_device *cdev);
 143 void cmf_retry_copy_block(struct ccw_device *);
 144 int cmf_reenable(struct ccw_device *);
 145 void cmf_reactivate(void);
 146 extern struct device_attribute dev_attr_cmb_enable;
 147 #endif