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[lttv.git] / lttv / lttv / state.h

/* This file is part of the Linux Trace Toolkit viewer
 * Copyright (C) 2003-2004 Michel Dagenais
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
 * MA 02110-1301, USA.
 */

#ifndef STATE_H
#define STATE_H

#include <glib.h>
#include <stdio.h>
#include <babeltrace/context.h>
#include <lttv/attribute.h>
/* The operating system state, kept during the trace analysis,
   contains a subset of the real operating system state, 
   sufficient for the analysis, and possibly organized quite differently.

   The state information is added to LttvTracesetContext, LttvTraceContext 
   and LttvTracefileContext objects, used by process_traceset, through
   subtyping. The context objects already reflect the multiple tracefiles
   (one per cpu) per trace and multiple traces per trace set. The state
   objects defined here simply add fields to the relevant context objects. 

   There is no traceset specific state yet. It may eventually contains such
   things as clock differences over time.

   The trace state currently consists in a process table. 

   The tracefile level state relates to the associated cpu. It contains the
   position of the current event in the tracefile (since the state depends on
   which events have been processed) and a pointer to the current process,
   in the process table, being run on that cpu.

   For each process in the process table, various information such as exec 
   file name, pid, ppid and creation time are stored. Each process state also
   contains an execution mode stack (e.g. irq within system call, called
   from user mode). */

typedef struct _LttvTraceset LttvTraceset;

typedef struct _LttvTrace LttvTrace;

typedef struct _LttvTracesetPosition LttvTracesetPosition;

struct bt_context;

/* Priority of state hooks */
#define LTTV_PRIO_STATE 25

#define LTTV_STATE_SAVE_INTERVAL 50000


#define PREALLOC_NB_SYSCALLS	256
/*
 * As of 2.6.38, IRQ 239 has been seen (and we have seen higher than
 * 256 too.
 */
#define PREALLOC_NB_IRQS	512
/* As of 2.6.38, 255 softirqs are used. */
#define PREALLOC_NB_SOFT_IRQS	512
#define PREALLOC_NB_TRAPS	256

/* Channel Quarks */

extern GQuark
	LTT_CHANNEL_FD_STATE,
	LTT_CHANNEL_GLOBAL_STATE,
	LTT_CHANNEL_IRQ_STATE,
	LTT_CHANNEL_MODULE_STATE,
	LTT_CHANNEL_NETIF_STATE,
	LTT_CHANNEL_SOFTIRQ_STATE,
	LTT_CHANNEL_SWAP_STATE,
	LTT_CHANNEL_SYSCALL_STATE,
	LTT_CHANNEL_TASK_STATE,
	LTT_CHANNEL_VM_STATE,
	LTT_CHANNEL_KPROBE_STATE,
	LTT_CHANNEL_FS,
	LTT_CHANNEL_KERNEL,
	LTT_CHANNEL_MM,
	LTT_CHANNEL_USERSPACE,
	LTT_CHANNEL_BLOCK;

/* Events Quarks */

extern GQuark 
	LTT_EVENT_SYSCALL_ENTRY,
	LTT_EVENT_SYSCALL_EXIT,
	LTT_EVENT_TRAP_ENTRY,
	LTT_EVENT_TRAP_EXIT,
	LTT_EVENT_PAGE_FAULT_ENTRY,
	LTT_EVENT_PAGE_FAULT_EXIT,
	LTT_EVENT_PAGE_FAULT_NOSEM_ENTRY,
	LTT_EVENT_PAGE_FAULT_NOSEM_EXIT,
	LTT_EVENT_IRQ_ENTRY,
	LTT_EVENT_IRQ_EXIT,
	LTT_EVENT_SOFT_IRQ_RAISE,
	LTT_EVENT_SOFT_IRQ_ENTRY,
	LTT_EVENT_SOFT_IRQ_EXIT,
	LTT_EVENT_SCHED_SCHEDULE,
	LTT_EVENT_SCHED_TRY_WAKEUP,
	LTT_EVENT_PROCESS_FORK,
	LTT_EVENT_KTHREAD_CREATE,
	LTT_EVENT_PROCESS_EXIT,
	LTT_EVENT_PROCESS_FREE,
	LTT_EVENT_EXEC,
	LTT_EVENT_PROCESS_STATE,
	LTT_EVENT_STATEDUMP_END,
	//LTT_EVENT_FUNCTION_ENTRY,
	//LTT_EVENT_FUNCTION_EXIT,
	LTT_EVENT_REQUEST_ISSUE,
	LTT_EVENT_REQUEST_COMPLETE,
	LTT_EVENT_LIST_INTERRUPT,
	LTT_EVENT_SYS_CALL_TABLE,
	LTT_EVENT_SOFTIRQ_VEC,
	LTT_EVENT_KPROBE_TABLE,
	LTT_EVENT_KPROBE,
	LTT_EVENT_OPEN,
	LTT_EVENT_READ,
	LTT_EVENT_POLL_EVENT;

/* Fields Quarks */

extern GQuark 
	LTT_FIELD_SYSCALL_ID,
	LTT_FIELD_TRAP_ID,
	LTT_FIELD_IRQ_ID,
	LTT_FIELD_SOFT_IRQ_ID,
	LTT_FIELD_PREV_PID,
	LTT_FIELD_NEXT_PID,
	LTT_FIELD_PREV_STATE,
	LTT_FIELD_PARENT_PID,
	LTT_FIELD_CHILD_PID,
	LTT_FIELD_PID,
	LTT_FIELD_TGID,
	LTT_FIELD_FILENAME,
	LTT_FIELD_NAME,
	LTT_FIELD_TYPE,
	LTT_FIELD_MODE,
	LTT_FIELD_SUBMODE,
	LTT_FIELD_STATUS,
	LTT_FIELD_THIS_FN,
	LTT_FIELD_CALL_SITE,
	LTT_FIELD_MINOR,
	LTT_FIELD_MAJOR,
	LTT_FIELD_OPERATION,
	LTT_FIELD_ACTION,
	LTT_FIELD_ID,
	LTT_FIELD_ADDRESS,
	LTT_FIELD_SYMBOL,
	LTT_FIELD_IP,
	LTT_FIELD_FD,
	LTT_FIELD_STATE,
	LTT_FIELD_CPU_ID;

typedef struct _LttvTraceState LttvTraceState;
typedef struct _LttvTraceStateClass LttvTraceStateClass;

typedef struct _LttvTracefileState LttvTracefileState;
typedef struct _LttvTracefileStateClass LttvTracefileStateClass;

void lttv_state_add_event_hooks(LttvTraceset *traceset);
gint lttv_state_hook_add_event_hooks(void *hook_data, void *call_data);

void lttv_state_remove_event_hooks(LttvTraceset *traceset);
gint lttv_state_hook_remove_event_hooks(void *hook_data, void *call_data);

gint lttv_state_save_hook_add_event_hooks(void *hook_data, void *call_data);
gint lttv_state_save_hook_remove_event_hooks(void *hook_data, void *call_data);


//TODO ybrosseau 2012-07-30: Change name of seek_time_closest to:
//void lttv_traceset_seek_time_closest_prior_state(LttvTraceset *traceset, LttTime t);

void lttv_state_traceset_seek_time_closest(LttvTraceset *traceset, LttTime t);
void lttv_state_traceset_seek_time(LttvTraceset *traceset, LttTime t);
void lttv_state_traceset_seek_position(LttvTraceset *traceset, LttvTracesetPosition *position);

/* The LttvProcessState structure defines the current state for each process.
   A process can make system calls (in some rare cases nested) and receive
   interrupts/faults. For instance, a process may issue a system call,
   generate a page fault while reading an argument from user space, and
   get caught by an interrupt. To represent these nested states, an
   execution mode stack is maintained. The stack bottom is normal user mode 
   and the top of stack is the current execution mode.

   The execution mode stack tells about the process status, execution mode and
   submode (interrupt, system call or IRQ number). All these could be 
   defined as enumerations but may need extensions (e.g. new process state). 
   GQuark are thus used. They are as easy to manipulate as integers but have
   a string associated, just like enumerations.

   The execution mode is one of "user mode", "kernel thread", "system call",
   "interrupt request", "fault". */

typedef GQuark LttvExecutionMode;

extern LttvExecutionMode
	LTTV_STATE_USER_MODE,
	LTTV_STATE_MAYBE_USER_MODE,
	LTTV_STATE_SYSCALL,
	LTTV_STATE_MAYBE_SYSCALL,
	LTTV_STATE_TRAP,
	LTTV_STATE_MAYBE_TRAP,	/* TODO */
	LTTV_STATE_IRQ,
	LTTV_STATE_SOFT_IRQ,
	LTTV_STATE_MODE_UNKNOWN;


/* The submode number depends on the execution mode. For user mode or kernel
   thread, which are the normal mode (execution mode stack bottom), 
   it is set to "none". For interrupt requests, faults and system calls, 
   it is set respectively to the interrupt name (e.g. "timer"), fault name 
   (e.g. "page fault"), and system call name (e.g. "select"). */
 
typedef GQuark LttvExecutionSubmode;

extern LttvExecutionSubmode
	LTTV_STATE_SUBMODE_NONE,
	LTTV_STATE_SUBMODE_UNKNOWN;

/* The process status is one of "running", "wait-cpu" (runnable), or "wait-*"
   where "*" describes the resource waited for (e.g. timer, process, 
   disk...). */

typedef GQuark LttvProcessStatus;

extern LttvProcessStatus
	LTTV_STATE_UNNAMED,
	LTTV_STATE_WAIT_FORK,
	LTTV_STATE_WAIT_CPU,
	LTTV_STATE_EXIT,
	LTTV_STATE_ZOMBIE,
	LTTV_STATE_WAIT,
	LTTV_STATE_RUN,
	LTTV_STATE_DEAD;

typedef GQuark LttvProcessType;

extern LttvProcessType
	LTTV_STATE_USER_THREAD,
	LTTV_STATE_KERNEL_THREAD;

typedef GQuark LttvCPUMode;
extern LttvCPUMode
	LTTV_CPU_UNKNOWN,
	LTTV_CPU_IDLE,
	LTTV_CPU_BUSY,
	LTTV_CPU_IRQ,
	LTTV_CPU_SOFT_IRQ,
	LTTV_CPU_TRAP;

typedef GQuark LttvIRQMode;
extern LttvIRQMode
	LTTV_IRQ_UNKNOWN,
	LTTV_IRQ_IDLE,
	LTTV_IRQ_BUSY;

typedef GQuark LttvBdevMode;
extern LttvBdevMode
	LTTV_BDEV_UNKNOWN,
	LTTV_BDEV_IDLE,
	LTTV_BDEV_BUSY_READING,
	LTTV_BDEV_BUSY_WRITING;

typedef struct _LttvExecutionState {
	LttvExecutionMode t;
	LttvExecutionSubmode n;
	LttTime entry;
	LttTime change;
	LttTime cum_cpu_time;
	LttvProcessStatus s;
} LttvExecutionState;

typedef struct _LttvProcessState {
	guint pid;
	guint tgid;
	guint ppid;
	LttTime creation_time;
	LttTime insertion_time;
	GQuark name;
	GQuark pid_time;
	GArray *execution_stack;         /* Array of LttvExecutionState */
	LttvExecutionState *state;       /* Top of interrupt stack */
		/* WARNING : each time the execution_stack size is modified, the state
		 * must be reget : g_array_set_size can have to move the array.
		 * (Mathieu) */
	guint cpu;                /* CPU where process is scheduled (being either in
	                             the active or inactive runqueue)*/
//	guint last_tracefile_index;    /* index in the trace for cpu tracefile */
	/* opened file descriptors, address map?... */
	LttvProcessType type;        /* kernel thread or user space ? */
	guint free_events; /* 0 : none, 1 : free or exit dead, 2 : should delete */
	GHashTable *fds; /* hash table of int (file descriptor) -> GQuark (file name) */
} LttvProcessState;

#define ANY_CPU 0 /* For clarity sake : a call to lttv_state_find_process for
                     a PID != 0 will search on any cpu automatically. */

LttvProcessState *lttv_state_find_process(LttvTraceState *ts, guint cpu,
		guint pid);

LttvProcessState *lttv_state_find_process_or_create(LttvTraceState *ts,
		guint cpu, guint pid, const LttTime *timestamp);

LttvProcessState *lttv_state_create_process(LttvTraceState *tcs,
		LttvProcessState *parent, guint cpu, guint pid,
		guint tgid, GQuark name, const LttTime *timestamp);

//void lttv_state_write(LttvTraceState *trace_state, LttTime t, FILE *fp);
//void lttv_state_write_raw(LttvTraceState *trace_state, LttTime t, FILE *fp);

typedef struct _LttvCPUState {
	GArray *mode_stack;
	GArray *irq_stack;
	GArray *softirq_stack;
	GArray *trap_stack;
} LttvCPUState;

typedef struct _LttvIRQState {
	GArray *mode_stack;
} LttvIRQState;

typedef struct _LttvSoftIRQState {
	guint pending; /* number of times it is pending */
	guint running; /* number of times it is currently running (on different processors) */
} LttvSoftIRQState;

typedef struct _LttvTrapState {
	guint running; /* number of times it is currently running (on different processors) */
} LttvTrapState;

typedef struct _LttvBdevState {
	GArray *mode_stack;
} LttvBdevState;

typedef struct _LttvNameTables {
	GQuark *syscall_names;
	guint nb_syscalls;
	GQuark *trap_names;
	guint nb_traps;
	GQuark *irq_names;
	guint nb_irqs;
	GQuark *soft_irq_names;
	guint nb_soft_irqs;
	GHashTable *kprobe_hash;
} LttvNameTables;

struct _LttvTraceState {
	LttvTrace *trace;	/* LttvTrace this state belongs to */
	GHashTable *processes;  /* LttvProcessState objects indexed by pid and
	                           last_cpu */
	guint nb_event, save_interval;
	/* Block/char devices, locks, memory pages... */
	GQuark *eventtype_names;
	LttvNameTables *name_tables;
	LttTime *max_time_state_recomputed_in_seek;
	GHashTable *kprobe_hash;

	/* Array of per cpu running process */
	LttvProcessState **running_process;

	LttvCPUState *cpu_states; /* state of each cpu */
	/* FIXME should be a g_array to deal with resize and copy. */
	LttvIRQState *irq_states; /* state of each irq handler */
	/* FIXME should be a g_array to deal with resize and copy. */
	LttvSoftIRQState *soft_irq_states; /* state of each softirq */
	/* FIXME should be a g_array to deal with resize and copy. */
	LttvTrapState *trap_states; /* state of each trap */
	GHashTable *bdev_states; /* state of the block devices */
};

void lttv_trace_state_init(LttvTraceState *self, LttvTrace *trace);
void lttv_trace_state_fini(LttvTraceState *self);

void lttv_state_save(LttvTraceState *self, LttvAttribute *container);
void lttv_state_restore(LttvTraceState *self, LttvAttribute *container);
LttvTracesetPosition *lttv_trace_state_get_position(LttvAttribute *container);
void lttv_state_saved_free(LttvTraceState *self, LttvAttribute *container);

//TODO ybrosseau Need to export that cleanly
//int lttv_state_pop_state_cleanup(LttvProcessState *process,
//				 LttvEvent *event);

#define HDR_PROCESS 0
#define HDR_ES 1
#define HDR_USER_STACK 2
//#define HDR_USERTRACE 3
#define HDR_PROCESS_STATE 4
#define HDR_CPU 5
#define HDR_TRACEFILE 6
#define HDR_TRACESET 7
#define HDR_TRACE 8
#define HDR_QUARKS 9
#define HDR_QUARK 10

/* Device number manipulation macros from kernel source */
#define MINORBITS	20
#define MINORMASK	((1U << MINORBITS) - 1)
#define MAJOR(dev)	((unsigned int) ((dev) >> MINORBITS))
#define MINOR(dev)	((unsigned int) ((dev) & MINORMASK))
#define MKDEV(ma, mi)	((((unsigned int) (ma)) << MINORBITS) | (unsigned int) (mi))

#endif // STATE_H