device.h (4463B)
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 */ 16enum 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 */ 41enum 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 50struct ccw_device; 51 52/* 53 * action called through jumptable 54 */ 55typedef void (fsm_func_t)(struct ccw_device *, enum dev_event); 56extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS]; 57 58static inline void 59dev_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 */ 76static inline int 77dev_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 85int __init io_subchannel_init(void); 86 87void io_subchannel_recog_done(struct ccw_device *cdev); 88void io_subchannel_init_config(struct subchannel *sch); 89 90int ccw_device_cancel_halt_clear(struct ccw_device *); 91 92int ccw_device_is_orphan(struct ccw_device *); 93 94void ccw_device_recognition(struct ccw_device *); 95int ccw_device_online(struct ccw_device *); 96int ccw_device_offline(struct ccw_device *); 97void ccw_device_update_sense_data(struct ccw_device *); 98int ccw_device_test_sense_data(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 128int ccw_device_stlck(struct ccw_device *); 129 130/* Helper function for machine check handling. */ 131void ccw_device_trigger_reprobe(struct ccw_device *); 132void ccw_device_kill_io(struct ccw_device *); 133int ccw_device_notify(struct ccw_device *, int); 134void ccw_device_set_disconnected(struct ccw_device *cdev); 135void ccw_device_set_notoper(struct ccw_device *cdev); 136 137void ccw_device_timeout(struct timer_list *t); 138void ccw_device_set_timeout(struct ccw_device *, int); 139void ccw_device_schedule_recovery(void); 140 141/* Channel measurement facility related */ 142void retry_set_schib(struct ccw_device *cdev); 143void cmf_retry_copy_block(struct ccw_device *); 144int cmf_reenable(struct ccw_device *); 145void cmf_reactivate(void); 146extern struct device_attribute dev_attr_cmb_enable; 147#endif