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 154