| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | void ccw_device_schedule_sch_unregister(struct ccw_device *); |
| 100 | int ccw_purge_blacklisted(void); |
| 101 | void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo); |
| 102 | struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id); |
| 103 | |
| 104 | /* Function prototypes for device status and basic sense stuff. */ |
| 105 | void ccw_device_accumulate_irb(struct ccw_device *, struct irb *); |
| 106 | void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *); |
| 107 | int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *); |
| 108 | int ccw_device_do_sense(struct ccw_device *, struct irb *); |
| 109 | |
| 110 | /* Function prototype for internal request handling. */ |
| 111 | int lpm_adjust(int lpm, int mask); |
| 112 | void ccw_request_start(struct ccw_device *); |
| 113 | int ccw_request_cancel(struct ccw_device *cdev); |
| 114 | void ccw_request_handler(struct ccw_device *cdev); |
| 115 | void ccw_request_timeout(struct ccw_device *cdev); |
| 116 | void ccw_request_notoper(struct ccw_device *cdev); |
| 117 | |
| 118 | /* Function prototypes for sense id stuff. */ |
| 119 | void ccw_device_sense_id_start(struct ccw_device *); |
| 120 | void ccw_device_sense_id_done(struct ccw_device *, int); |
| 121 | |
| 122 | /* Function prototypes for path grouping stuff. */ |
| 123 | void ccw_device_verify_start(struct ccw_device *); |
| 124 | void ccw_device_verify_done(struct ccw_device *, int); |
| 125 | |
| 126 | void ccw_device_disband_start(struct ccw_device *); |
| 127 | void ccw_device_disband_done(struct ccw_device *, int); |
| 128 | |
| 129 | int ccw_device_stlck(struct ccw_device *); |
| 130 | |
| 131 | /* Helper function for machine check handling. */ |
| 132 | void ccw_device_trigger_reprobe(struct ccw_device *); |
| 133 | void ccw_device_kill_io(struct ccw_device *); |
| 134 | int ccw_device_notify(struct ccw_device *, int); |
| 135 | void ccw_device_set_disconnected(struct ccw_device *cdev); |
| 136 | void ccw_device_set_notoper(struct ccw_device *cdev); |
| 137 | |
| 138 | void ccw_device_timeout(struct timer_list *t); |
| 139 | void ccw_device_set_timeout(struct ccw_device *, int); |
| 140 | void ccw_device_schedule_recovery(void); |
| 141 | |
| 142 | /* Channel measurement facility related */ |
| 143 | void retry_set_schib(struct ccw_device *cdev); |
| 144 | void cmf_retry_copy_block(struct ccw_device *); |
| 145 | int cmf_reenable(struct ccw_device *); |
| 146 | void cmf_reactivate(void); |
| 147 | int ccw_set_cmf(struct ccw_device *cdev, int enable); |
| 148 | extern struct device_attribute dev_attr_cmb_enable; |
| 149 | #endif |