545 lines
17 KiB
C
545 lines
17 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
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*
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* Deterministic automata (DA) monitor functions, to be used together
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* with automata models in C generated by the dot2k tool.
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*
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* The dot2k tool is available at tools/verification/dot2k/
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*
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* For further information, see:
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* Documentation/trace/rv/da_monitor_synthesis.rst
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*/
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#include <rv/automata.h>
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#include <linux/rv.h>
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#include <linux/bug.h>
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#ifdef CONFIG_RV_REACTORS
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#define DECLARE_RV_REACTING_HELPERS(name, type) \
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static char REACT_MSG_##name[1024]; \
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\
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static inline char *format_react_msg_##name(type curr_state, type event) \
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{ \
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snprintf(REACT_MSG_##name, 1024, \
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"rv: monitor %s does not allow event %s on state %s\n", \
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#name, \
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model_get_event_name_##name(event), \
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model_get_state_name_##name(curr_state)); \
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return REACT_MSG_##name; \
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} \
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\
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static void cond_react_##name(char *msg) \
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{ \
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if (rv_##name.react) \
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rv_##name.react(msg); \
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} \
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\
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static bool rv_reacting_on_##name(void) \
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{ \
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return rv_reacting_on(); \
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}
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#else /* CONFIG_RV_REACTOR */
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#define DECLARE_RV_REACTING_HELPERS(name, type) \
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static inline char *format_react_msg_##name(type curr_state, type event) \
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{ \
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return NULL; \
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} \
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\
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static void cond_react_##name(char *msg) \
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{ \
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return; \
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} \
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\
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static bool rv_reacting_on_##name(void) \
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{ \
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return 0; \
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}
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#endif
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/*
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* Generic helpers for all types of deterministic automata monitors.
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*/
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#define DECLARE_DA_MON_GENERIC_HELPERS(name, type) \
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\
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DECLARE_RV_REACTING_HELPERS(name, type) \
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\
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/* \
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* da_monitor_reset_##name - reset a monitor and setting it to init state \
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*/ \
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static inline void da_monitor_reset_##name(struct da_monitor *da_mon) \
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{ \
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da_mon->monitoring = 0; \
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da_mon->curr_state = model_get_initial_state_##name(); \
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} \
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\
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/* \
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* da_monitor_curr_state_##name - return the current state \
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*/ \
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static inline type da_monitor_curr_state_##name(struct da_monitor *da_mon) \
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{ \
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return da_mon->curr_state; \
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} \
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\
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/* \
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* da_monitor_set_state_##name - set the new current state \
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*/ \
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static inline void \
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da_monitor_set_state_##name(struct da_monitor *da_mon, enum states_##name state) \
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{ \
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da_mon->curr_state = state; \
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} \
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\
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/* \
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* da_monitor_start_##name - start monitoring \
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* \
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* The monitor will ignore all events until monitoring is set to true. This \
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* function needs to be called to tell the monitor to start monitoring. \
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*/ \
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static inline void da_monitor_start_##name(struct da_monitor *da_mon) \
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{ \
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da_mon->curr_state = model_get_initial_state_##name(); \
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da_mon->monitoring = 1; \
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} \
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\
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/* \
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* da_monitoring_##name - returns true if the monitor is processing events \
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*/ \
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static inline bool da_monitoring_##name(struct da_monitor *da_mon) \
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{ \
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return da_mon->monitoring; \
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} \
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\
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/* \
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* da_monitor_enabled_##name - checks if the monitor is enabled \
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*/ \
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static inline bool da_monitor_enabled_##name(void) \
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{ \
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/* global switch */ \
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if (unlikely(!rv_monitoring_on())) \
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return 0; \
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\
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/* monitor enabled */ \
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if (unlikely(!rv_##name.enabled)) \
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return 0; \
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\
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return 1; \
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} \
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\
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/* \
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* da_monitor_handling_event_##name - checks if the monitor is ready to handle events \
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*/ \
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static inline bool da_monitor_handling_event_##name(struct da_monitor *da_mon) \
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{ \
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\
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if (!da_monitor_enabled_##name()) \
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return 0; \
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\
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/* monitor is actually monitoring */ \
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if (unlikely(!da_monitoring_##name(da_mon))) \
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return 0; \
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\
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return 1; \
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}
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/*
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* Event handler for implicit monitors. Implicit monitor is the one which the
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* handler does not need to specify which da_monitor to manipulate. Examples
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* of implicit monitor are the per_cpu or the global ones.
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*/
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#define DECLARE_DA_MON_MODEL_HANDLER_IMPLICIT(name, type) \
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\
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static inline bool \
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da_event_##name(struct da_monitor *da_mon, enum events_##name event) \
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{ \
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type curr_state = da_monitor_curr_state_##name(da_mon); \
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type next_state = model_get_next_state_##name(curr_state, event); \
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\
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if (next_state != INVALID_STATE) { \
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da_monitor_set_state_##name(da_mon, next_state); \
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\
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trace_event_##name(model_get_state_name_##name(curr_state), \
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model_get_event_name_##name(event), \
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model_get_state_name_##name(next_state), \
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model_is_final_state_##name(next_state)); \
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\
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return true; \
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} \
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\
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if (rv_reacting_on_##name()) \
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cond_react_##name(format_react_msg_##name(curr_state, event)); \
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\
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trace_error_##name(model_get_state_name_##name(curr_state), \
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model_get_event_name_##name(event)); \
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\
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return false; \
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} \
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/*
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* Event handler for per_task monitors.
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*/
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#define DECLARE_DA_MON_MODEL_HANDLER_PER_TASK(name, type) \
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\
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static inline bool da_event_##name(struct da_monitor *da_mon, struct task_struct *tsk, \
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enum events_##name event) \
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{ \
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type curr_state = da_monitor_curr_state_##name(da_mon); \
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type next_state = model_get_next_state_##name(curr_state, event); \
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\
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if (next_state != INVALID_STATE) { \
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da_monitor_set_state_##name(da_mon, next_state); \
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\
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trace_event_##name(tsk->pid, \
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model_get_state_name_##name(curr_state), \
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model_get_event_name_##name(event), \
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model_get_state_name_##name(next_state), \
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model_is_final_state_##name(next_state)); \
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\
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return true; \
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} \
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\
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if (rv_reacting_on_##name()) \
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cond_react_##name(format_react_msg_##name(curr_state, event)); \
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\
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trace_error_##name(tsk->pid, \
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model_get_state_name_##name(curr_state), \
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model_get_event_name_##name(event)); \
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\
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return false; \
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}
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/*
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* Functions to define, init and get a global monitor.
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*/
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#define DECLARE_DA_MON_INIT_GLOBAL(name, type) \
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\
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/* \
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* global monitor (a single variable) \
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*/ \
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static struct da_monitor da_mon_##name; \
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\
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/* \
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* da_get_monitor_##name - return the global monitor address \
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*/ \
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static struct da_monitor *da_get_monitor_##name(void) \
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{ \
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return &da_mon_##name; \
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} \
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\
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/* \
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* da_monitor_reset_all_##name - reset the single monitor \
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*/ \
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static void da_monitor_reset_all_##name(void) \
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{ \
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da_monitor_reset_##name(da_get_monitor_##name()); \
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} \
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\
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/* \
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* da_monitor_init_##name - initialize a monitor \
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*/ \
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static inline int da_monitor_init_##name(void) \
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{ \
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da_monitor_reset_all_##name(); \
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return 0; \
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} \
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\
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/* \
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* da_monitor_destroy_##name - destroy the monitor \
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*/ \
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static inline void da_monitor_destroy_##name(void) \
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{ \
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return; \
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}
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/*
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* Functions to define, init and get a per-cpu monitor.
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*/
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#define DECLARE_DA_MON_INIT_PER_CPU(name, type) \
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\
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/* \
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* per-cpu monitor variables \
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*/ \
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DEFINE_PER_CPU(struct da_monitor, da_mon_##name); \
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\
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/* \
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* da_get_monitor_##name - return current CPU monitor address \
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*/ \
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static struct da_monitor *da_get_monitor_##name(void) \
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{ \
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return this_cpu_ptr(&da_mon_##name); \
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} \
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\
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/* \
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* da_monitor_reset_all_##name - reset all CPUs' monitor \
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*/ \
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static void da_monitor_reset_all_##name(void) \
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{ \
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struct da_monitor *da_mon; \
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int cpu; \
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for_each_cpu(cpu, cpu_online_mask) { \
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da_mon = per_cpu_ptr(&da_mon_##name, cpu); \
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da_monitor_reset_##name(da_mon); \
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} \
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} \
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\
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/* \
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* da_monitor_init_##name - initialize all CPUs' monitor \
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*/ \
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static inline int da_monitor_init_##name(void) \
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{ \
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da_monitor_reset_all_##name(); \
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return 0; \
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} \
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\
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/* \
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* da_monitor_destroy_##name - destroy the monitor \
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*/ \
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static inline void da_monitor_destroy_##name(void) \
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{ \
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return; \
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}
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/*
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* Functions to define, init and get a per-task monitor.
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*/
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#define DECLARE_DA_MON_INIT_PER_TASK(name, type) \
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\
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/* \
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* The per-task monitor is stored a vector in the task struct. This variable \
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* stores the position on the vector reserved for this monitor. \
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*/ \
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static int task_mon_slot_##name = RV_PER_TASK_MONITOR_INIT; \
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\
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/* \
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* da_get_monitor_##name - return the monitor in the allocated slot for tsk \
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*/ \
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static inline struct da_monitor *da_get_monitor_##name(struct task_struct *tsk) \
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{ \
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return &tsk->rv[task_mon_slot_##name].da_mon; \
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} \
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\
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static void da_monitor_reset_all_##name(void) \
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{ \
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struct task_struct *g, *p; \
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\
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read_lock(&tasklist_lock); \
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for_each_process_thread(g, p) \
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da_monitor_reset_##name(da_get_monitor_##name(p)); \
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read_unlock(&tasklist_lock); \
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} \
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\
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/* \
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* da_monitor_init_##name - initialize the per-task monitor \
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* \
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* Try to allocate a slot in the task's vector of monitors. If there \
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* is an available slot, use it and reset all task's monitor. \
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*/ \
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static int da_monitor_init_##name(void) \
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{ \
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int slot; \
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\
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slot = rv_get_task_monitor_slot(); \
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if (slot < 0 || slot >= RV_PER_TASK_MONITOR_INIT) \
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return slot; \
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\
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task_mon_slot_##name = slot; \
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\
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da_monitor_reset_all_##name(); \
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return 0; \
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} \
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\
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/* \
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* da_monitor_destroy_##name - return the allocated slot \
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*/ \
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static inline void da_monitor_destroy_##name(void) \
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{ \
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if (task_mon_slot_##name == RV_PER_TASK_MONITOR_INIT) { \
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WARN_ONCE(1, "Disabling a disabled monitor: " #name); \
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return; \
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} \
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rv_put_task_monitor_slot(task_mon_slot_##name); \
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task_mon_slot_##name = RV_PER_TASK_MONITOR_INIT; \
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return; \
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}
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/*
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* Handle event for implicit monitor: da_get_monitor_##name() will figure out
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* the monitor.
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*/
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#define DECLARE_DA_MON_MONITOR_HANDLER_IMPLICIT(name, type) \
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\
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|
|
static inline void __da_handle_event_##name(struct da_monitor *da_mon, \
|
||
|
|
enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
bool retval; \
|
||
|
|
\
|
||
|
|
retval = da_event_##name(da_mon, event); \
|
||
|
|
if (!retval) \
|
||
|
|
da_monitor_reset_##name(da_mon); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
/* \
|
||
|
|
* da_handle_event_##name - handle an event \
|
||
|
|
*/ \
|
||
|
|
static inline void da_handle_event_##name(enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
struct da_monitor *da_mon = da_get_monitor_##name(); \
|
||
|
|
bool retval; \
|
||
|
|
\
|
||
|
|
retval = da_monitor_handling_event_##name(da_mon); \
|
||
|
|
if (!retval) \
|
||
|
|
return; \
|
||
|
|
\
|
||
|
|
__da_handle_event_##name(da_mon, event); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
/* \
|
||
|
|
* da_handle_start_event_##name - start monitoring or handle event \
|
||
|
|
* \
|
||
|
|
* This function is used to notify the monitor that the system is returning \
|
||
|
|
* to the initial state, so the monitor can start monitoring in the next event. \
|
||
|
|
* Thus: \
|
||
|
|
* \
|
||
|
|
* If the monitor already started, handle the event. \
|
||
|
|
* If the monitor did not start yet, start the monitor but skip the event. \
|
||
|
|
*/ \
|
||
|
|
static inline bool da_handle_start_event_##name(enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
struct da_monitor *da_mon; \
|
||
|
|
\
|
||
|
|
if (!da_monitor_enabled_##name()) \
|
||
|
|
return 0; \
|
||
|
|
\
|
||
|
|
da_mon = da_get_monitor_##name(); \
|
||
|
|
\
|
||
|
|
if (unlikely(!da_monitoring_##name(da_mon))) { \
|
||
|
|
da_monitor_start_##name(da_mon); \
|
||
|
|
return 0; \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
__da_handle_event_##name(da_mon, event); \
|
||
|
|
\
|
||
|
|
return 1; \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
/* \
|
||
|
|
* da_handle_start_run_event_##name - start monitoring and handle event \
|
||
|
|
* \
|
||
|
|
* This function is used to notify the monitor that the system is in the \
|
||
|
|
* initial state, so the monitor can start monitoring and handling event. \
|
||
|
|
*/ \
|
||
|
|
static inline bool da_handle_start_run_event_##name(enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
struct da_monitor *da_mon; \
|
||
|
|
\
|
||
|
|
if (!da_monitor_enabled_##name()) \
|
||
|
|
return 0; \
|
||
|
|
\
|
||
|
|
da_mon = da_get_monitor_##name(); \
|
||
|
|
\
|
||
|
|
if (unlikely(!da_monitoring_##name(da_mon))) \
|
||
|
|
da_monitor_start_##name(da_mon); \
|
||
|
|
\
|
||
|
|
__da_handle_event_##name(da_mon, event); \
|
||
|
|
\
|
||
|
|
return 1; \
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Handle event for per task.
|
||
|
|
*/
|
||
|
|
#define DECLARE_DA_MON_MONITOR_HANDLER_PER_TASK(name, type) \
|
||
|
|
\
|
||
|
|
static inline void \
|
||
|
|
__da_handle_event_##name(struct da_monitor *da_mon, struct task_struct *tsk, \
|
||
|
|
enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
bool retval; \
|
||
|
|
\
|
||
|
|
retval = da_event_##name(da_mon, tsk, event); \
|
||
|
|
if (!retval) \
|
||
|
|
da_monitor_reset_##name(da_mon); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
/* \
|
||
|
|
* da_handle_event_##name - handle an event \
|
||
|
|
*/ \
|
||
|
|
static inline void \
|
||
|
|
da_handle_event_##name(struct task_struct *tsk, enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
struct da_monitor *da_mon = da_get_monitor_##name(tsk); \
|
||
|
|
bool retval; \
|
||
|
|
\
|
||
|
|
retval = da_monitor_handling_event_##name(da_mon); \
|
||
|
|
if (!retval) \
|
||
|
|
return; \
|
||
|
|
\
|
||
|
|
__da_handle_event_##name(da_mon, tsk, event); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
/* \
|
||
|
|
* da_handle_start_event_##name - start monitoring or handle event \
|
||
|
|
* \
|
||
|
|
* This function is used to notify the monitor that the system is returning \
|
||
|
|
* to the initial state, so the monitor can start monitoring in the next event. \
|
||
|
|
* Thus: \
|
||
|
|
* \
|
||
|
|
* If the monitor already started, handle the event. \
|
||
|
|
* If the monitor did not start yet, start the monitor but skip the event. \
|
||
|
|
*/ \
|
||
|
|
static inline bool \
|
||
|
|
da_handle_start_event_##name(struct task_struct *tsk, enum events_##name event) \
|
||
|
|
{ \
|
||
|
|
struct da_monitor *da_mon; \
|
||
|
|
\
|
||
|
|
if (!da_monitor_enabled_##name()) \
|
||
|
|
return 0; \
|
||
|
|
\
|
||
|
|
da_mon = da_get_monitor_##name(tsk); \
|
||
|
|
\
|
||
|
|
if (unlikely(!da_monitoring_##name(da_mon))) { \
|
||
|
|
da_monitor_start_##name(da_mon); \
|
||
|
|
return 0; \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
__da_handle_event_##name(da_mon, tsk, event); \
|
||
|
|
\
|
||
|
|
return 1; \
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Entry point for the global monitor.
|
||
|
|
*/
|
||
|
|
#define DECLARE_DA_MON_GLOBAL(name, type) \
|
||
|
|
\
|
||
|
|
DECLARE_AUTOMATA_HELPERS(name, type) \
|
||
|
|
DECLARE_DA_MON_GENERIC_HELPERS(name, type) \
|
||
|
|
DECLARE_DA_MON_MODEL_HANDLER_IMPLICIT(name, type) \
|
||
|
|
DECLARE_DA_MON_INIT_GLOBAL(name, type) \
|
||
|
|
DECLARE_DA_MON_MONITOR_HANDLER_IMPLICIT(name, type)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Entry point for the per-cpu monitor.
|
||
|
|
*/
|
||
|
|
#define DECLARE_DA_MON_PER_CPU(name, type) \
|
||
|
|
\
|
||
|
|
DECLARE_AUTOMATA_HELPERS(name, type) \
|
||
|
|
DECLARE_DA_MON_GENERIC_HELPERS(name, type) \
|
||
|
|
DECLARE_DA_MON_MODEL_HANDLER_IMPLICIT(name, type) \
|
||
|
|
DECLARE_DA_MON_INIT_PER_CPU(name, type) \
|
||
|
|
DECLARE_DA_MON_MONITOR_HANDLER_IMPLICIT(name, type)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Entry point for the per-task monitor.
|
||
|
|
*/
|
||
|
|
#define DECLARE_DA_MON_PER_TASK(name, type) \
|
||
|
|
\
|
||
|
|
DECLARE_AUTOMATA_HELPERS(name, type) \
|
||
|
|
DECLARE_DA_MON_GENERIC_HELPERS(name, type) \
|
||
|
|
DECLARE_DA_MON_MODEL_HANDLER_PER_TASK(name, type) \
|
||
|
|
DECLARE_DA_MON_INIT_PER_TASK(name, type) \
|
||
|
|
DECLARE_DA_MON_MONITOR_HANDLER_PER_TASK(name, type)
|