Replay is capable of recording normal BH events, but sometimes there are single use callbacks scheduled with aio_bh_schedule_oneshot function. This patch enables recording and replaying such callbacks. Block layer uses these events for calling the completion function. Replaying these calls makes the execution deterministic. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
195 lines
6.3 KiB
C
195 lines
6.3 KiB
C
#ifndef REPLAY_INTERNAL_H
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#define REPLAY_INTERNAL_H
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/*
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* replay-internal.h
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*
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* Copyright (c) 2010-2015 Institute for System Programming
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* of the Russian Academy of Sciences.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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/* Any changes to order/number of events will need to bump REPLAY_VERSION */
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enum ReplayEvents {
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/* for instruction event */
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EVENT_INSTRUCTION,
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/* for software interrupt */
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EVENT_INTERRUPT,
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/* for emulated exceptions */
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EVENT_EXCEPTION,
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/* for async events */
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EVENT_ASYNC,
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/* for shutdown requests, range allows recovery of ShutdownCause */
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EVENT_SHUTDOWN,
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EVENT_SHUTDOWN_LAST = EVENT_SHUTDOWN + SHUTDOWN_CAUSE__MAX,
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/* for character device write event */
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EVENT_CHAR_WRITE,
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/* for character device read all event */
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EVENT_CHAR_READ_ALL,
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EVENT_CHAR_READ_ALL_ERROR,
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/* for audio out event */
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EVENT_AUDIO_OUT,
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/* for audio in event */
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EVENT_AUDIO_IN,
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/* for clock read/writes */
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/* some of greater codes are reserved for clocks */
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EVENT_CLOCK,
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EVENT_CLOCK_LAST = EVENT_CLOCK + REPLAY_CLOCK_COUNT - 1,
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/* for checkpoint event */
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/* some of greater codes are reserved for checkpoints */
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EVENT_CHECKPOINT,
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EVENT_CHECKPOINT_LAST = EVENT_CHECKPOINT + CHECKPOINT_COUNT - 1,
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/* end of log event */
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EVENT_END,
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EVENT_COUNT
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};
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/* Asynchronous events IDs */
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enum ReplayAsyncEventKind {
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REPLAY_ASYNC_EVENT_BH,
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REPLAY_ASYNC_EVENT_BH_ONESHOT,
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REPLAY_ASYNC_EVENT_INPUT,
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REPLAY_ASYNC_EVENT_INPUT_SYNC,
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REPLAY_ASYNC_EVENT_CHAR_READ,
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REPLAY_ASYNC_EVENT_BLOCK,
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REPLAY_ASYNC_EVENT_NET,
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REPLAY_ASYNC_COUNT
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};
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typedef enum ReplayAsyncEventKind ReplayAsyncEventKind;
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typedef struct ReplayState {
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/*! Cached clock values. */
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int64_t cached_clock[REPLAY_CLOCK_COUNT];
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/*! Current icount - number of processed instructions. */
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uint64_t current_icount;
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/*! Number of instructions to be executed before other events happen. */
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int instruction_count;
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/*! Type of the currently executed event. */
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unsigned int data_kind;
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/*! Flag which indicates that event is not processed yet. */
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unsigned int has_unread_data;
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/*! Temporary variable for saving current log offset. */
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uint64_t file_offset;
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/*! Next block operation id.
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This counter is global, because requests from different
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block devices should not get overlapping ids. */
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uint64_t block_request_id;
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/*! Prior value of the host clock */
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uint64_t host_clock_last;
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/*! Asynchronous event type read from the log */
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int32_t read_event_kind;
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/*! Asynchronous event id read from the log */
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uint64_t read_event_id;
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/*! Asynchronous event checkpoint id read from the log */
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int32_t read_event_checkpoint;
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} ReplayState;
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extern ReplayState replay_state;
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/* File for replay writing */
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extern FILE *replay_file;
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void replay_put_byte(uint8_t byte);
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void replay_put_event(uint8_t event);
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void replay_put_word(uint16_t word);
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void replay_put_dword(uint32_t dword);
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void replay_put_qword(int64_t qword);
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void replay_put_array(const uint8_t *buf, size_t size);
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uint8_t replay_get_byte(void);
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uint16_t replay_get_word(void);
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uint32_t replay_get_dword(void);
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int64_t replay_get_qword(void);
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void replay_get_array(uint8_t *buf, size_t *size);
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void replay_get_array_alloc(uint8_t **buf, size_t *size);
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/* Mutex functions for protecting replay log file and ensuring
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* synchronisation between vCPU and main-loop threads. */
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void replay_mutex_init(void);
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bool replay_mutex_locked(void);
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/*! Checks error status of the file. */
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void replay_check_error(void);
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/*! Finishes processing of the replayed event and fetches
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the next event from the log. */
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void replay_finish_event(void);
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/*! Reads data type from the file and stores it in the
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data_kind variable. */
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void replay_fetch_data_kind(void);
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/*! Advance replay_state.current_icount to the specified value. */
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void replay_advance_current_icount(uint64_t current_icount);
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/*! Saves queued events (like instructions and sound). */
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void replay_save_instructions(void);
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/*! Skips async events until some sync event will be found.
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\return true, if event was found */
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bool replay_next_event_is(int event);
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/*! Reads next clock value from the file.
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If clock kind read from the file is different from the parameter,
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the value is not used. */
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void replay_read_next_clock(unsigned int kind);
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/* Asynchronous events queue */
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/*! Initializes events' processing internals */
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void replay_init_events(void);
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/*! Clears internal data structures for events handling */
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void replay_finish_events(void);
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/*! Flushes events queue */
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void replay_flush_events(void);
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/*! Returns true if there are any unsaved events in the queue */
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bool replay_has_events(void);
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/*! Saves events from queue into the file */
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void replay_save_events(int checkpoint);
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/*! Read events from the file into the input queue */
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void replay_read_events(int checkpoint);
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/*! Adds specified async event to the queue */
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void replay_add_event(ReplayAsyncEventKind event_kind, void *opaque,
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void *opaque2, uint64_t id);
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/* Input events */
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/*! Saves input event to the log */
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void replay_save_input_event(InputEvent *evt);
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/*! Reads input event from the log */
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InputEvent *replay_read_input_event(void);
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/*! Adds input event to the queue */
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void replay_add_input_event(struct InputEvent *event);
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/*! Adds input sync event to the queue */
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void replay_add_input_sync_event(void);
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/* Character devices */
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/*! Called to run char device read event. */
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void replay_event_char_read_run(void *opaque);
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/*! Writes char read event to the file. */
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void replay_event_char_read_save(void *opaque);
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/*! Reads char event read from the file. */
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void *replay_event_char_read_load(void);
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/* Network devices */
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/*! Called to run network event. */
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void replay_event_net_run(void *opaque);
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/*! Writes network event to the file. */
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void replay_event_net_save(void *opaque);
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/*! Reads network from the file. */
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void *replay_event_net_load(void);
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/* VMState-related functions */
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/* Registers replay VMState.
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Should be called before virtual devices initialization
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to make cached timers available for post_load functions. */
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void replay_vmstate_register(void);
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#endif
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