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/*
 * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License (not later!)
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <string.h>

#include "trace-graph.h"
#include "trace-filter.h"

#define RED 0xff
#define GREEN (0xff<<16)

struct task_plot_info {
	int			pid;
	struct cpu_data		*cpu_data;
	struct record		**last_records;
	unsigned long long	last_time;
	unsigned long long	wake_time;
	unsigned long long	display_wake_time;
	int			wake_color;
	int			last_cpu;
};

static void convert_nano(unsigned long long time, unsigned long *sec,
			 unsigned long *usec)
{
	*sec = time / 1000000000ULL;
	*usec = (time / 1000) % 1000000;
}

static gint hash_pid(gint val)
{
	/* idle always gets black */
	if (!val)
		return 0;

	return trace_hash(val);
}

static int hash_cpu(int cpu)
{
	cpu = (cpu << 3) + cpu * 21;
 
	return trace_hash(cpu);
}

static gboolean is_running(struct graph_info *ginfo, struct record *record)
{
	unsigned long long val;
	int id;

	id = pevent_data_type(ginfo->pevent, record);
	if (id != ginfo->event_sched_switch_id)
		return FALSE;

	pevent_read_number_field(ginfo->event_prev_state, record->data, &val);
	return val ? FALSE : TRUE;
}

static gboolean record_matches_pid(struct graph_info *ginfo,
				   struct record *record, int match_pid,
				   int *pid, int *sched_pid,
				   gboolean *is_sched,
				   gboolean *wakeup)
{
	const char *comm;

	*is_sched = FALSE;
	*wakeup = FALSE;

	*pid = pevent_data_pid(ginfo->pevent, record);
	*sched_pid = *pid;

	if (trace_graph_check_sched_switch(ginfo, record, sched_pid, &comm)) {
		if (*pid == match_pid || *sched_pid == match_pid) {
			*is_sched = TRUE;
			return TRUE;
		}
	}

	if (trace_graph_check_sched_wakeup(ginfo, record, sched_pid)) {
		if (*sched_pid == match_pid) {
			*wakeup = TRUE;
			return TRUE;
		}
	}

	if (*pid == match_pid)
		return TRUE;

	return FALSE;
}

static void set_cpu_to_time(int cpu, struct graph_info *ginfo, unsigned long long time)
{
	struct record *record;

	tracecmd_set_cpu_to_timestamp(ginfo->handle, cpu, time);

	while ((record = tracecmd_read_data(ginfo->handle, cpu))) {
		if (record->ts >= time)
			break;

		free_record(record);
	}
	if (record) {
		tracecmd_set_cursor(ginfo->handle, cpu, record->offset);
		free_record(record);
	} else
		tracecmd_set_cpu_to_timestamp(ginfo->handle, cpu, time);
}

static void set_cpus_to_time(struct graph_info *ginfo, unsigned long long time)
{
	int cpu;

	for (cpu = 0; cpu < ginfo->cpus; cpu++)
		set_cpu_to_time(cpu, ginfo, time);
}

static int task_plot_match_time(struct graph_info *ginfo, struct graph_plot *plot,
			       unsigned long long time)
{
	struct task_plot_info *task_info = plot->private;
	struct record *record = NULL;
	gboolean is_wakeup;
	gboolean is_sched;
	gboolean match;
	int rec_pid;
	int sched_pid;
	int next_cpu;
	int pid;
	int ret = 0;

	pid = task_info->pid;

	set_cpus_to_time(ginfo, time);

	do {
		free_record(record);

		record = tracecmd_read_next_data(ginfo->handle, &next_cpu);
		if (!record)
			return 0;

		match = record_matches_pid(ginfo, record, pid, &rec_pid,
					   &sched_pid, &is_sched, &is_wakeup);

		/* Use +1 to make sure we have a match first */
	} while ((!match && record->ts < time + 1) ||
		 (match && record->ts < time));

	if (record && record->ts == time)
		ret = 1;
	free_record(record);

	return ret;
}

struct offset_cache {
	guint64 *offsets;
};

static struct offset_cache *save_offsets(struct graph_info *ginfo)
{
	struct offset_cache *offsets;
	struct record *record;
	int cpu;

	offsets = malloc_or_die(sizeof(*offsets));
	offsets->offsets = malloc_or_die(sizeof(*offsets->offsets) * ginfo->cpus);
	memset(offsets->offsets, 0, sizeof(*offsets->offsets) * ginfo->cpus);

	for (cpu = 0; cpu < ginfo->cpus; cpu++) {
		record = tracecmd_peek_data(ginfo->handle, cpu);
		if (record)
			offsets->offsets[cpu] = record->offset;
	}

	return offsets;
}

static void restore_offsets(struct graph_info *ginfo, struct offset_cache *offsets)
{
	struct record *record;
	int cpu;

	for (cpu = 0; cpu < ginfo->cpus; cpu++) {
		if (offsets->offsets[cpu])
			tracecmd_set_cursor(ginfo->handle, cpu, offsets->offsets[cpu]);
		else {
			/* end of cpu, make sure it stays the end */
			record = tracecmd_read_cpu_last(ginfo->handle, cpu);
			free_record(record);
		}
	}

	free(offsets->offsets);
	free(offsets);
}

static struct record *
find_record(struct graph_info *ginfo, gint pid, guint64 time)
{
	struct record *record = NULL;
	gboolean is_wakeup;
	gboolean is_sched;
	gboolean match;
	int sched_pid;
	int rec_pid;
	int next_cpu;

	set_cpus_to_time(ginfo, time);

	do {
		free_record(record);

		record = tracecmd_read_next_data(ginfo->handle, &next_cpu);
		if (!record)
			return NULL;

		match = record_matches_pid(ginfo, record, pid, &rec_pid,
					   &sched_pid,  &is_sched, &is_wakeup);

		/* Use +1 to make sure we have a match first */
	} while (!(record->ts > time && match));


	return record;
}

static int task_plot_display_last_event(struct graph_info *ginfo,
					struct graph_plot *plot,
					struct trace_seq *s,
					unsigned long long time)
{
	struct task_plot_info *task_info = plot->private;
	struct event_format *event;
	struct record *record;
	struct offset_cache *offsets;
	gboolean is_sched;
	gboolean is_wakeup;
	int sched_pid;
	int rec_pid;
	int pid;
	int type;

	pid = task_info->pid;

	/*
	 * Get the next record so we know can save its offset and
	 * reset the cursor, not to mess up the plotting
	 */
	offsets = save_offsets(ginfo);

	record = find_record(ginfo, pid, time);

	restore_offsets(ginfo, offsets);

	if (!record)
		return 0;

	record_matches_pid(ginfo, record, pid, &rec_pid,
			   &sched_pid, &is_sched, &is_wakeup);

	if (is_sched) {
		if (sched_pid == pid) {
			if (task_info->display_wake_time) {
				trace_seq_printf(s, "sched_switch\n"
						 "CPU %d: lat: %.3fus\n",
						 record->cpu,
						 (double)(record->ts -
							  task_info->display_wake_time) / 1000.0);
				task_info->display_wake_time = 0;
			} else {
				trace_seq_printf(s, "sched_switch\n"
						 "CPU %d\n",
						 record->cpu);
			}
		} else {
			trace_seq_printf(s, "sched_switch\n"
					 "CPU %d %s-%d\n",
					 record->cpu,
					 pevent_data_comm_from_pid(ginfo->pevent, pid),
					 pid);
		}
	} else {
			
		/* Must have the record we want */
		type = pevent_data_type(ginfo->pevent, record);
		event = pevent_data_event_from_type(ginfo->pevent, type);
		if (pid == rec_pid)
			trace_seq_printf(s, "CPU %d\n%s\n",
					 record->cpu, event->name);
		else
			trace_seq_printf(s, "%s-%d\n%s\n",
					 pevent_data_comm_from_pid(ginfo->pevent, rec_pid),
					 rec_pid, event->name);
	}
	free_record(record);

	return 1;
}

static void task_plot_start(struct graph_info *ginfo, struct graph_plot *plot,
			    unsigned long long time)
{
	struct task_plot_info *task_info = plot->private;

	memset(task_info->last_records, 0, sizeof(struct record *) * ginfo->cpus);

	task_info->last_time = 0ULL;
	task_info->last_cpu = -1;
	task_info->wake_time = 0ULL;
	task_info->display_wake_time = 0ULL;
}

static void update_last_record(struct graph_info *ginfo,
			       struct task_plot_info *task_info,
			       struct record *record)
{
	struct tracecmd_input *handle = ginfo->handle;
	struct record *trecord, *t2record;
	struct record *saved;
	unsigned long long ts;
	int sched_pid;
	int pid;
	int rec_pid;
	int is_wakeup;
	int is_sched;
	int this_cpu;
	int cpu;

	pid = task_info->pid;

	if (record) {
		ts = record->ts;
		this_cpu = record->cpu;
	} else {
		ts = ginfo->view_end_time;
		this_cpu = -1;
	}

	for (cpu = 0; cpu < ginfo->cpus; cpu++) {

		if (task_info->last_records[cpu])
			continue;

		if (cpu == this_cpu) {
			static int once;

			trecord = tracecmd_read_prev(handle, record);
			/* Set cpu cursor back to what it was  */
			saved = tracecmd_read_data(handle, cpu);
			if (!once && saved->offset != record->offset) {
				once++;
				warning("failed to reset cursor!");
			}
			free_record(saved);
		} else {
			static int once;

			saved = tracecmd_peek_data(handle, cpu);
			set_cpu_to_time(cpu, ginfo, ts);
			t2record = tracecmd_read_data(handle, cpu);
			trecord = tracecmd_read_prev(handle, t2record);
			free_record(t2record);
			/* reset cursor back to what it was */
			if (saved)
				tracecmd_set_cursor(handle, cpu, saved->offset);
			else {
				saved = tracecmd_read_data(handle, cpu);
				if (!once && saved) {
					once++;
					warning("failed to reset cursor to end!");
				}
			}
		}
		if (!trecord)
			continue;

		if (record_matches_pid(ginfo, trecord, pid, &rec_pid,
				       &sched_pid, &is_sched, &is_wakeup) &&
		    !is_wakeup &&
		    (!is_sched || (is_sched && sched_pid == pid))) {
			task_info->last_records[cpu] = trecord;
			task_info->last_cpu = trecord->cpu;
			task_info->last_time = trecord->ts;
			break;
		}

		free_record(trecord);
	}
}

static int task_plot_event(struct graph_info *ginfo,
			   struct graph_plot *plot,
			   struct record *record,
			   struct plot_info *info)
{
	struct task_plot_info *task_info = plot->private;
	gboolean match;
	int sched_pid;
	int rec_pid;
	int is_wakeup;
	int is_sched;
	int pid;
	int cpu;

	pid = task_info->pid;

	if (!record) {
		update_last_record(ginfo, task_info, record);
		/* no more records, finish a box if one was started */
		if (task_info->last_cpu >= 0) {
			info->box = TRUE;
			info->bstart = task_info->last_time;
			info->bend = ginfo->view_end_time;
			info->bcolor = hash_cpu(task_info->last_cpu);
		}
		for (cpu = 0; cpu < ginfo->cpus; cpu++) {
			free_record(task_info->last_records[cpu]);
			task_info->last_records[cpu] = NULL;
		}
		return 0;
	}

	match = record_matches_pid(ginfo, record, pid, &rec_pid,
				   &sched_pid, &is_sched, &is_wakeup);


	if (!match && record->cpu != task_info->last_cpu) {
		if (!task_info->last_records[record->cpu]) {
			task_info->last_records[record->cpu] = record;
			tracecmd_record_ref(record);
		}
		return 0;
	}

	if (match) {
		info->line = TRUE;
		info->lcolor = hash_pid(rec_pid);
		info->ltime = record->ts;

		/*
		 * Is this our first match?
		 *
		 * If last record is NULL, then it may exist off the
		 * viewable range. Search to see if one exists, and if
		 * it is the record we want to match.
		 */
		update_last_record(ginfo, task_info, record);

		if (is_wakeup) {
			/* Wake up but not task */
			info->ltime = hash_pid(rec_pid);

			/* Another task ? */
			if (task_info->last_cpu == record->cpu) {
				info->box = TRUE;
				info->bcolor = hash_cpu(task_info->last_cpu);
				info->bstart = task_info->last_time;
				info->bend = record->ts;
				task_info->last_cpu = -1;
			}

			task_info->wake_time = record->ts;
			task_info->wake_color = GREEN;
			task_info->display_wake_time = record->ts;

			return 1;
		}

		if (task_info->last_cpu != record->cpu) {
			if (task_info->last_cpu >= 0) {
				/* Switched CPUs */
				info->box = TRUE;
				info->bcolor = hash_cpu(task_info->last_cpu);
				info->bstart = task_info->last_time;
				info->bend = record->ts;
			}
			task_info->last_time = record->ts;
		}

		task_info->last_cpu = record->cpu;
		if (is_sched) {
			if (rec_pid != pid) {
				/* Just got scheduled in */
				task_info->last_cpu = record->cpu;
				task_info->last_time = record->ts;
				if (task_info->wake_time) {
					info->box = TRUE;
					info->bfill = FALSE;
					info->bstart = task_info->wake_time;
					info->bend = record->ts;
					info->bcolor = task_info->wake_color;
				} else
					task_info->wake_time = 0;

			} else if (!info->box) {
				/* just got scheduled out */
				info->box = TRUE;