replay/replay-internal.h

   1 #ifndef REPLAY_INTERNAL_H
   2 #define REPLAY_INTERNAL_H
   3
   4 /*
   5  * replay-internal.h
   6  *
   7  * Copyright (c) 2010-2015 Institute for System Programming
   8  *                         of the Russian Academy of Sciences.
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 /* Any changes to order/number of events will need to bump REPLAY_VERSION */
  16 enum ReplayEvents {
  17     /* for instruction event */
  18     EVENT_INSTRUCTION,
  19     /* for software interrupt */
  20     EVENT_INTERRUPT,
  21     /* for emulated exceptions */
  22     EVENT_EXCEPTION,
  23     /* for async events */
  24     EVENT_ASYNC,
  25     /* for shutdown requests, range allows recovery of ShutdownCause */
  26     EVENT_SHUTDOWN,
  27     EVENT_SHUTDOWN_LAST = EVENT_SHUTDOWN + SHUTDOWN_CAUSE__MAX,
  28     /* for character device write event */
  29     EVENT_CHAR_WRITE,
  30     /* for character device read all event */
  31     EVENT_CHAR_READ_ALL,
  32     EVENT_CHAR_READ_ALL_ERROR,
  33     /* for audio out event */
  34     EVENT_AUDIO_OUT,
  35     /* for audio in event */
  36     EVENT_AUDIO_IN,
  37     /* for clock read/writes */
  38     /* some of greater codes are reserved for clocks */
  39     EVENT_CLOCK,
  40     EVENT_CLOCK_LAST = EVENT_CLOCK + REPLAY_CLOCK_COUNT - 1,
  41     /* for checkpoint event */
  42     /* some of greater codes are reserved for checkpoints */
  43     EVENT_CHECKPOINT,
  44     EVENT_CHECKPOINT_LAST = EVENT_CHECKPOINT + CHECKPOINT_COUNT - 1,
  45     /* end of log event */
  46     EVENT_END,
  47     EVENT_COUNT
  48 };
  49
  50 /* Asynchronous events IDs */
  51
  52 enum ReplayAsyncEventKind {
  53     REPLAY_ASYNC_EVENT_BH,
  54     REPLAY_ASYNC_EVENT_INPUT,
  55     REPLAY_ASYNC_EVENT_INPUT_SYNC,
  56     REPLAY_ASYNC_EVENT_CHAR_READ,
  57     REPLAY_ASYNC_EVENT_BLOCK,
  58     REPLAY_ASYNC_EVENT_NET,
  59     REPLAY_ASYNC_COUNT
  60 };
  61
  62 typedef enum ReplayAsyncEventKind ReplayAsyncEventKind;
  63
  64 typedef struct ReplayState {
  65     /*! Cached clock values. */
  66     int64_t cached_clock[REPLAY_CLOCK_COUNT];
  67     /*! Current step - number of processed instructions and timer events. */
  68     uint64_t current_step;
  69     /*! Number of instructions to be executed before other events happen. */
  70     int instructions_count;
  71     /*! Type of the currently executed event. */
  72     unsigned int data_kind;
  73     /*! Flag which indicates that event is not processed yet. */
  74     unsigned int has_unread_data;
  75     /*! Temporary variable for saving current log offset. */
  76     uint64_t file_offset;
  77     /*! Next block operation id.
  78         This counter is global, because requests from different
  79         block devices should not get overlapping ids. */
  80     uint64_t block_request_id;
  81     /*! Prior value of the host clock */
  82     uint64_t host_clock_last;
  83     /*! Asynchronous event type read from the log */
  84     int32_t read_event_kind;
  85     /*! Asynchronous event id read from the log */
  86     uint64_t read_event_id;
  87     /*! Asynchronous event checkpoint id read from the log */
  88     int32_t read_event_checkpoint;
  89 } ReplayState;
  90 extern ReplayState replay_state;
  91
  92 /* File for replay writing */
  93 extern FILE *replay_file;
  94
  95 void replay_put_byte(uint8_t byte);
  96 void replay_put_event(uint8_t event);
  97 void replay_put_word(uint16_t word);
  98 void replay_put_dword(uint32_t dword);
  99 void replay_put_qword(int64_t qword);
 100 void replay_put_array(const uint8_t *buf, size_t size);
 101
 102 uint8_t replay_get_byte(void);
 103 uint16_t replay_get_word(void);
 104 uint32_t replay_get_dword(void);
 105 int64_t replay_get_qword(void);
 106 void replay_get_array(uint8_t *buf, size_t *size);
 107 void replay_get_array_alloc(uint8_t **buf, size_t *size);
 108
 109 /* Mutex functions for protecting replay log file and ensuring
 110  * synchronisation between vCPU and main-loop threads. */
 111
 112 void replay_mutex_init(void);
 113 bool replay_mutex_locked(void);
 114
 115 /*! Checks error status of the file. */
 116 void replay_check_error(void);
 117
 118 /*! Finishes processing of the replayed event and fetches
 119     the next event from the log. */
 120 void replay_finish_event(void);
 121 /*! Reads data type from the file and stores it in the
 122     data_kind variable. */
 123 void replay_fetch_data_kind(void);
 124
 125 /*! Saves queued events (like instructions and sound). */
 126 void replay_save_instructions(void);
 127
 128 /*! Skips async events until some sync event will be found.
 129     \return true, if event was found */
 130 bool replay_next_event_is(int event);
 131
 132 /*! Reads next clock value from the file.
 133     If clock kind read from the file is different from the parameter,
 134     the value is not used. */
 135 void replay_read_next_clock(unsigned int kind);
 136
 137 /* Asynchronous events queue */
 138
 139 /*! Initializes events' processing internals */
 140 void replay_init_events(void);
 141 /*! Clears internal data structures for events handling */
 142 void replay_finish_events(void);
 143 /*! Flushes events queue */
 144 void replay_flush_events(void);
 145 /*! Clears events list before loading new VM state */
 146 void replay_clear_events(void);
 147 /*! Returns true if there are any unsaved events in the queue */
 148 bool replay_has_events(void);
 149 /*! Saves events from queue into the file */
 150 void replay_save_events(int checkpoint);
 151 /*! Read events from the file into the input queue */
 152 void replay_read_events(int checkpoint);
 153 /*! Adds specified async event to the queue */
 154 void replay_add_event(ReplayAsyncEventKind event_kind, void *opaque,
 155                       void *opaque2, uint64_t id);
 156
 157 /* Input events */
 158
 159 /*! Saves input event to the log */
 160 void replay_save_input_event(InputEvent *evt);
 161 /*! Reads input event from the log */
 162 InputEvent *replay_read_input_event(void);
 163 /*! Adds input event to the queue */
 164 void replay_add_input_event(struct InputEvent *event);
 165 /*! Adds input sync event to the queue */
 166 void replay_add_input_sync_event(void);
 167
 168 /* Character devices */
 169
 170 /*! Called to run char device read event. */
 171 void replay_event_char_read_run(void *opaque);
 172 /*! Writes char read event to the file. */
 173 void replay_event_char_read_save(void *opaque);
 174 /*! Reads char event read from the file. */
 175 void *replay_event_char_read_load(void);
 176
 177 /* Network devices */
 178
 179 /*! Called to run network event. */
 180 void replay_event_net_run(void *opaque);
 181 /*! Writes network event to the file. */
 182 void replay_event_net_save(void *opaque);
 183 /*! Reads network from the file. */
 184 void *replay_event_net_load(void);
 185
 186 /* VMState-related functions */
 187
 188 /* Registers replay VMState.
 189    Should be called before virtual devices initialization
 190    to make cached timers available for post_load functions. */
 191 void replay_vmstate_register(void);
 192
 193 #endif