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-rw-r--r--drivers/s390/cio/device.h147
1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
new file mode 100644
index 0000000000..24b2fce695
--- /dev/null
+++ b/drivers/s390/cio/device.h
@@ -0,0 +1,147 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef S390_DEVICE_H
+#define S390_DEVICE_H
+
+#include <asm/ccwdev.h>
+#include <linux/atomic.h>
+#include <linux/timer.h>
+#include <linux/wait.h>
+#include <linux/notifier.h>
+#include <linux/kernel_stat.h>
+#include "io_sch.h"
+
+/*
+ * states of the device statemachine
+ */
+enum dev_state {
+ DEV_STATE_NOT_OPER,
+ DEV_STATE_SENSE_ID,
+ DEV_STATE_OFFLINE,
+ DEV_STATE_VERIFY,
+ DEV_STATE_ONLINE,
+ DEV_STATE_W4SENSE,
+ DEV_STATE_DISBAND_PGID,
+ DEV_STATE_BOXED,
+ /* states to wait for i/o completion before doing something */
+ DEV_STATE_TIMEOUT_KILL,
+ DEV_STATE_QUIESCE,
+ /* special states for devices gone not operational */
+ DEV_STATE_DISCONNECTED,
+ DEV_STATE_DISCONNECTED_SENSE_ID,
+ DEV_STATE_CMFCHANGE,
+ DEV_STATE_CMFUPDATE,
+ DEV_STATE_STEAL_LOCK,
+ /* last element! */
+ NR_DEV_STATES
+};
+
+/*
+ * asynchronous events of the device statemachine
+ */
+enum dev_event {
+ DEV_EVENT_NOTOPER,
+ DEV_EVENT_INTERRUPT,
+ DEV_EVENT_TIMEOUT,
+ DEV_EVENT_VERIFY,
+ /* last element! */
+ NR_DEV_EVENTS
+};
+
+struct ccw_device;
+
+/*
+ * action called through jumptable
+ */
+typedef void (fsm_func_t)(struct ccw_device *, enum dev_event);
+extern fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS];
+
+static inline void
+dev_fsm_event(struct ccw_device *cdev, enum dev_event dev_event)
+{
+ int state = cdev->private->state;
+
+ if (dev_event == DEV_EVENT_INTERRUPT) {
+ if (state == DEV_STATE_ONLINE)
+ inc_irq_stat(cdev->private->int_class);
+ else if (state != DEV_STATE_CMFCHANGE &&
+ state != DEV_STATE_CMFUPDATE)
+ inc_irq_stat(IRQIO_CIO);
+ }
+ dev_jumptable[state][dev_event](cdev, dev_event);
+}
+
+/*
+ * Delivers 1 if the device state is final.
+ */
+static inline int
+dev_fsm_final_state(struct ccw_device *cdev)
+{
+ return (cdev->private->state == DEV_STATE_NOT_OPER ||
+ cdev->private->state == DEV_STATE_OFFLINE ||
+ cdev->private->state == DEV_STATE_ONLINE ||
+ cdev->private->state == DEV_STATE_BOXED);
+}
+
+int __init io_subchannel_init(void);
+
+void io_subchannel_recog_done(struct ccw_device *cdev);
+void io_subchannel_init_config(struct subchannel *sch);
+
+int ccw_device_cancel_halt_clear(struct ccw_device *);
+
+int ccw_device_is_orphan(struct ccw_device *);
+
+void ccw_device_recognition(struct ccw_device *);
+int ccw_device_online(struct ccw_device *);
+int ccw_device_offline(struct ccw_device *);
+void ccw_device_update_sense_data(struct ccw_device *);
+int ccw_device_test_sense_data(struct ccw_device *);
+int ccw_purge_blacklisted(void);
+void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo);
+struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id);
+
+/* Function prototypes for device status and basic sense stuff. */
+void ccw_device_accumulate_irb(struct ccw_device *, struct irb *);
+void ccw_device_accumulate_basic_sense(struct ccw_device *, struct irb *);
+int ccw_device_accumulate_and_sense(struct ccw_device *, struct irb *);
+int ccw_device_do_sense(struct ccw_device *, struct irb *);
+
+/* Function prototype for internal request handling. */
+int lpm_adjust(int lpm, int mask);
+void ccw_request_start(struct ccw_device *);
+int ccw_request_cancel(struct ccw_device *cdev);
+void ccw_request_handler(struct ccw_device *cdev);
+void ccw_request_timeout(struct ccw_device *cdev);
+void ccw_request_notoper(struct ccw_device *cdev);
+
+/* Function prototypes for sense id stuff. */
+void ccw_device_sense_id_start(struct ccw_device *);
+void ccw_device_sense_id_done(struct ccw_device *, int);
+
+/* Function prototypes for path grouping stuff. */
+void ccw_device_verify_start(struct ccw_device *);
+void ccw_device_verify_done(struct ccw_device *, int);
+
+void ccw_device_disband_start(struct ccw_device *);
+void ccw_device_disband_done(struct ccw_device *, int);
+
+int ccw_device_stlck(struct ccw_device *);
+
+/* Helper function for machine check handling. */
+void ccw_device_trigger_reprobe(struct ccw_device *);
+void ccw_device_kill_io(struct ccw_device *);
+int ccw_device_notify(struct ccw_device *, int);
+void ccw_device_set_disconnected(struct ccw_device *cdev);
+void ccw_device_set_notoper(struct ccw_device *cdev);
+
+void ccw_device_timeout(struct timer_list *t);
+void ccw_device_set_timeout(struct ccw_device *, int);
+void ccw_device_schedule_recovery(void);
+
+/* Channel measurement facility related */
+void retry_set_schib(struct ccw_device *cdev);
+void cmf_retry_copy_block(struct ccw_device *);
+int cmf_reenable(struct ccw_device *);
+void cmf_reactivate(void);
+extern struct device_attribute dev_attr_cmb_enable;
+#endif