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/*
 * trace-event-scripting.  Scripting engine common and initialization code.
 *
 * Copyright (C) 2009-2010 Tom Zanussi <tzanussi@gmail.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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "../perf.h"
#include "util.h"
#include "trace-event.h"

struct scripting_context *scripting_context;

static int stop_script_unsupported(void)
{
	return 0;
}

static void process_event_unsupported(int cpu __unused,
				      void *data __unused,
				      int size __unused,
				      unsigned long long nsecs __unused,
				      char *comm __unused)
{
}

static void print_python_unsupported_msg(void)
{
	fprintf(stderr, "Python scripting not supported."
		"  Install libpython and rebuild perf to enable it.\n"
		"For example:\n  # apt-get install python-dev (ubuntu)"
		"\n  # yum install python-devel (Fedora)"
		"\n  etc.\n");
}

static int python_start_script_unsupported(const char *script __unused,
					   int argc __unused,
					   const char **argv __unused)
{
	print_python_unsupported_msg();

	return -1;
}

static int python_generate_script_unsupported(const char *outfile __unused)
{
	print_python_unsupported_msg();

	return -1;
}

struct scripting_ops python_scripting_unsupported_ops = {
	.name = "Python",
	.start_script = python_start_script_unsupported,
	.stop_script = stop_script_unsupported,
	.process_event = process_event_unsupported,
	.generate_script = python_generate_script_unsupported,
};

static void register_python_scripting(struct scripting_ops *scripting_ops)
{
	int err;
	err = script_spec_register("Python", scripting_ops);
	if (err)
		die("error registering Python script extension");

	err = script_spec_register("py", scripting_ops);
	if (err)
		die("error registering py script extension");

	scripting_context = malloc(sizeof(struct scripting_context));
}

#ifdef NO_LIBPYTHON
void setup_python_scripting(void)
{
	register_python_scripting(&python_scripting_unsupported_ops);
}
#else
struct scripting_ops python_scripting_ops;

void setup_python_scripting(void)
{
	register_python_scripting(&python_scripting_ops);
}
#endif

static void print_perl_unsupported_msg(void)
{
	fprintf(stderr, "Perl scripting not supported."
		"  Install libperl and rebuild perf to enable it.\n"
		"For example:\n  # apt-get install libperl-dev (ubuntu)"
		"\n  # yum install 'perl(ExtUtils::Embed)' (Fedora)"
		"\n  etc.\n");
}

static int perl_start_script_unsupported(const char *script __unused,
					 int argc __unused,
					 const char **argv __unused)
{
	print_perl_unsupported_msg();

	return -1;
}

static int perl_generate_script_unsupported(const char *outfile __unused)
{
	print_perl_unsupported_msg();

	return -1;
}

struct scripting_ops perl_scripting_unsupported_ops = {
	.name = "Perl",
	.start_script = perl_start_script_unsupported,
	.stop_script = stop_script_unsupported,
	.process_event = process_event_unsupported,
	.generate_script = perl_generate_script_unsupported,
};

static void register_perl_scripting(struct scripting_ops *scripting_ops)
{
	int err;
	err = script_spec_register("Perl", scripting_ops);
	if (err)
		die("error registering Perl script extension");

	err = script_spec_register("pl", scripting_ops);
	if (err)
		die("error registering pl script extension");

	scripting_context = malloc(sizeof(struct scripting_context));
}

#ifdef NO_LIBPERL
void setup_perl_scripting(void)
{
	register_perl_scripting(&perl_scripting_unsupported_ops);
}
#else
struct scripting_ops perl_scripting_ops;

void setup_perl_scripting(void)
{
	register_perl_scripting(&perl_scripting_ops);
}
#endif
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/*
 * Event char devices, giving access to raw input device events.
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define EVDEV_MINOR_BASE	64
#define EVDEV_MINORS		32
#define EVDEV_MIN_BUFFER_SIZE	64U
#define EVDEV_BUF_PACKETS	8

#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input/mt.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include "input-compat.h"

struct evdev {
	int open;
	struct input_handle handle;
	wait_queue_head_t wait;
	struct evdev_client __rcu *grab;
	struct list_head client_list;
	spinlock_t client_lock; /* protects client_list */
	struct mutex mutex;
	struct device dev;
	struct cdev cdev;
	bool exist;
};

struct evdev_client {
	unsigned int head;
	unsigned int tail;
	unsigned int packet_head; /* [future] position of the first element of next packet */
	spinlock_t buffer_lock; /* protects access to buffer, head and tail */
	struct fasync_struct *fasync;
	struct evdev *evdev;
	struct list_head node;
	int clkid;
	bool revoked;
	unsigned int bufsize;
	struct input_event buffer[];
};

/* flush queued events of type @type, caller must hold client->buffer_lock */
static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
{
	unsigned int i, head, num;
	unsigned int mask = client->bufsize - 1;
	bool is_report;
	struct input_event *ev;

	BUG_ON(type == EV_SYN);

	head = client->tail;
	client->packet_head = client->tail;

	/* init to 1 so a leading SYN_REPORT will not be dropped */
	num = 1;

	for (i = client->tail; i != client->head; i = (i + 1) & mask) {
		ev = &client->buffer[i];
		is_report = ev->type == EV_SYN && ev->code == SYN_REPORT;

		if (ev->type == type) {
			/* drop matched entry */
			continue;
		} else if (is_report && !num) {
			/* drop empty SYN_REPORT groups */
			continue;
		} else if (head != i) {
			/* move entry to fill the gap */
			client->buffer[head].time = ev->time;
			client->buffer[head].type = ev->type;
			client->buffer[head].code = ev->code;
			client->buffer[head].value = ev->value;
		}

		num++;
		head = (head + 1) & mask;

		if (is_report) {
			num = 0;
			client->packet_head = head;
		}
	}

	client->head = head;
}

/* queue SYN_DROPPED event */
static void evdev_queue_syn_dropped(struct evdev_client *client)
{
	unsigned long flags;
	struct input_event ev;
	ktime_t time;

	time = ktime_get();
	if (client->clkid != CLOCK_MONOTONIC)
		time = ktime_sub(time, ktime_get_monotonic_offset());

	ev.time = ktime_to_timeval(time);
	ev.type = EV_SYN;
	ev.code = SYN_DROPPED;
	ev.value = 0;

	spin_lock_irqsave(&client->buffer_lock, flags);

	client->buffer[client->head++] = ev;
	client->head &= client->bufsize - 1;

	if (unlikely(client->head == client->tail)) {
		/* drop queue but keep our SYN_DROPPED event */
		client->tail = (client->head - 1) & (client->bufsize - 1);
		client->packet_head = client->tail;
	}

	spin_unlock_irqrestore(&client->buffer_lock, flags);
}

static void __pass_event(struct evdev_client *client,
			 const struct input_event *event)
{
	client->buffer[client->head++] = *event;
	client->head &= client->bufsize - 1;

	if (unlikely(client->head == client->tail)) {
		/*
		 * This effectively "drops" all unconsumed events, leaving
		 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
		 */
		client->tail = (client->head - 2) & (client->bufsize - 1);

		client->buffer[client->tail].time = event->time;
		client->buffer[client->tail].type = EV_SYN;
		client->buffer[client->tail].code = SYN_DROPPED;
		client->buffer[client->tail].value = 0;

		client->packet_head = client->tail;
	}

	if (event->type == EV_SYN && event->code == SYN_REPORT) {
		client->packet_head = client->head;
		kill_fasync(&client->fasync, SIGIO, POLL_IN);
	}
}

static void evdev_pass_values(struct evdev_client *client,
			const struct input_value *vals, unsigned int count,
			ktime_t mono, ktime_t real)
{
	struct evdev *evdev = client->evdev;
	const struct input_value *v;
	struct input_event event;
	bool wakeup = false;

	if (client->revoked)
		return;

	event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
				      mono : real);

	/* Interrupts are disabled, just acquire the lock. */
	spin_lock(&client->buffer_lock);

	for (v = vals; v != vals + count; v++) {
		event.type = v->type;
		event.code = v->code;
		event.value = v->value;
		__pass_event(client, &event);
		if (v->type == EV_SYN && v->code == SYN_REPORT)
			wakeup = true;
	}

	spin_unlock(&client->buffer_lock);

	if (wakeup)
		wake_up_interruptible(&evdev->wait);
}

/*
 * Pass incoming events to all connected clients.
 */
static void evdev_events(struct input_handle *handle,
			 const struct input_value *vals, unsigned int count)
{
	struct evdev *evdev = handle->private;
	struct evdev_client *client;
	ktime_t time_mono, time_real;

	time_mono = ktime_get();
	time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());

	rcu_read_lock();

	client = rcu_dereference(evdev->grab);

	if (client)
		evdev_pass_values(client, vals, count, time_mono, time_real);
	else
		list_for_each_entry_rcu(client, &evdev->client_list, node)
			evdev_pass_values(client, vals, count,
					  time_mono, time_real);

	rcu_read_unlock();
}

/*
 * Pass incoming event to all connected clients.
 */
static void evdev_event(struct input_handle *handle,
			unsigned int type, unsigned int code, int value)
{
	struct input_value vals[] = { { type, code, value } };

	evdev_events(handle, vals, 1);
}

static int evdev_fasync(int fd, struct file *file, int on)
{
	struct evdev_client *client = file->private_data;

	return fasync_helper(fd, file, on, &client->fasync);
}

static int evdev_flush(struct file *file, fl_owner_t id)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	int retval;

	retval = mutex_lock_interruptible(&evdev->mutex);
	if (retval)
		return retval;

	if (!evdev->exist || client->revoked)
		retval = -ENODEV;
	else
		retval = input_flush_device(&evdev->handle, file);

	mutex_unlock(&evdev->mutex);
	return retval;
}

static void evdev_free(struct device *dev)
{
	struct evdev *evdev = container_of(dev, struct evdev, dev);

	input_put_device(evdev->handle.dev);
	kfree(evdev);
}

/*
 * Grabs an event device (along with underlying input device).
 * This function is called with evdev->mutex taken.
 */
static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
{
	int error;

	if (evdev->grab)
		return -EBUSY;

	error = input_grab_device(&evdev->handle);
	if (error)
		return error;

	rcu_assign_pointer(evdev->grab, client);

	return 0;
}

static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
{
	struct evdev_client *grab = rcu_dereference_protected(evdev->grab,
					lockdep_is_held(&evdev->mutex));

	if (grab != client)
		return  -EINVAL;

	rcu_assign_pointer(evdev->grab, NULL);
	synchronize_rcu();
	input_release_device(&evdev->handle);

	return 0;
}

static void evdev_attach_client(struct evdev *evdev,
				struct evdev_client *client)
{
	spin_lock(&evdev->client_lock);
	list_add_tail_rcu(&client->node, &evdev->client_list);
	spin_unlock(&evdev->client_lock);
}

static void evdev_detach_client(struct evdev *evdev,
				struct evdev_client *client)
{
	spin_lock(&evdev->client_lock);
	list_del_rcu(&client->node);
	spin_unlock(&evdev->client_lock);
	synchronize_rcu();
}

static int evdev_open_device(struct evdev *evdev)
{
	int retval;

	retval = mutex_lock_interruptible(&evdev->mutex);
	if (retval)
		return retval;

	if (!evdev->exist)
		retval = -ENODEV;
	else if (!evdev->open++) {
		retval = input_open_device(&evdev->handle);
		if (retval)
			evdev->open--;
	}

	mutex_unlock(&evdev->mutex);
	return retval;
}

static void evdev_close_device(struct evdev *evdev)
{
	mutex_lock(&evdev->mutex);

	if (evdev->exist && !--evdev->open)
		input_close_device(&evdev->handle);

	mutex_unlock(&evdev->mutex);
}

/*
 * Wake up users waiting for IO so they can disconnect from
 * dead device.
 */
static void evdev_hangup(struct evdev *evdev)
{
	struct evdev_client *client;

	spin_lock(&evdev->client_lock);
	list_for_each_entry(client, &evdev->client_list, node)
		kill_fasync(&client->fasync, SIGIO, POLL_HUP);
	spin_unlock(&evdev->client_lock);

	wake_up_interruptible(&evdev->wait);
}

static int evdev_release(struct inode *inode, struct file *file)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;

	mutex_lock(&evdev->mutex);
	evdev_ungrab(evdev, client);
	mutex_unlock(&evdev->mutex);

	evdev_detach_client(evdev, client);

	if (is_vmalloc_addr(client))
		vfree(client);
	else
		kfree(client);

	evdev_close_device(evdev);

	return 0;
}

static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
{
	unsigned int n_events =
		max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
		    EVDEV_MIN_BUFFER_SIZE);

	return roundup_pow_of_two(n_events);
}

static int evdev_open(struct inode *inode, struct file *file)
{
	struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
	unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
	unsigned int size = sizeof(struct evdev_client) +
					bufsize * sizeof(struct input_event);
	struct evdev_client *client;
	int error;

	client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
	if (!client)
		client = vzalloc(size);
	if (!client)
		return -ENOMEM;

	client->bufsize = bufsize;
	spin_lock_init(&client->buffer_lock);
	client->evdev = evdev;
	evdev_attach_client(evdev, client);

	error = evdev_open_device(evdev);
	if (error)
		goto err_free_client;

	file->private_data = client;
	nonseekable_open(inode, file);

	return 0;

 err_free_client: