[mirror_ubuntu-disco-kernel.git] / arch / s390 / appldata / appldata_base.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
 * Exports appldata_register_ops() and appldata_unregister_ops() for the
 * data gathering modules.
 *
 * Copyright IBM Corp. 2003, 2009
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#define KMSG_COMPONENT	"appldata"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/sched/stat.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/workqueue.h>
#include <linux/suspend.h>
#include <linux/platform_device.h>
#include <asm/appldata.h>
#include <asm/vtimer.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <asm/smp.h>

#include "appldata.h"


#define APPLDATA_CPU_INTERVAL	10000		/* default (CPU) time for
						   sampling interval in
						   milliseconds */

#define TOD_MICRO	0x01000			/* nr. of TOD clock units
						   for 1 microsecond */

static struct platform_device *appldata_pdev;

/*
 * /proc entries (sysctl)
 */
static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
static int appldata_timer_handler(struct ctl_table *ctl, int write,
				  void __user *buffer, size_t *lenp, loff_t *ppos);
static int appldata_interval_handler(struct ctl_table *ctl, int write,
					 void __user *buffer,
					 size_t *lenp, loff_t *ppos);

static struct ctl_table_header *appldata_sysctl_header;
static struct ctl_table appldata_table[] = {
	{
		.procname	= "timer",
		.mode		= S_IRUGO | S_IWUSR,
		.proc_handler	= appldata_timer_handler,
	},
	{
		.procname	= "interval",
		.mode		= S_IRUGO | S_IWUSR,
		.proc_handler	= appldata_interval_handler,
	},
	{ },
};

static struct ctl_table appldata_dir_table[] = {
	{
		.procname	= appldata_proc_name,
		.maxlen		= 0,
		.mode		= S_IRUGO | S_IXUGO,
		.child		= appldata_table,
	},
	{ },
};

/*
 * Timer
 */
static struct vtimer_list appldata_timer;

static DEFINE_SPINLOCK(appldata_timer_lock);
static int appldata_interval = APPLDATA_CPU_INTERVAL;
static int appldata_timer_active;
static int appldata_timer_suspended = 0;

/*
 * Work queue
 */
static struct workqueue_struct *appldata_wq;
static void appldata_work_fn(struct work_struct *work);
static DECLARE_WORK(appldata_work, appldata_work_fn);


/*
 * Ops list
 */
static DEFINE_MUTEX(appldata_ops_mutex);
static LIST_HEAD(appldata_ops_list);


/*************************** timer, work, DIAG *******************************/
/*
 * appldata_timer_function()
 *
 * schedule work and reschedule timer
 */
static void appldata_timer_function(unsigned long data)
{
	queue_work(appldata_wq, (struct work_struct *) data);
}

/*
 * appldata_work_fn()
 *
 * call data gathering function for each (active) module
 */
static void appldata_work_fn(struct work_struct *work)
{
	struct list_head *lh;
	struct appldata_ops *ops;

	mutex_lock(&appldata_ops_mutex);
	list_for_each(lh, &appldata_ops_list) {
		ops = list_entry(lh, struct appldata_ops, list);
		if (ops->active == 1) {
			ops->callback(ops->data);
		}
	}
	mutex_unlock(&appldata_ops_mutex);
}

static struct appldata_product_id appldata_id = {
	.prod_nr    = {0xD3, 0xC9, 0xD5, 0xE4,
		       0xE7, 0xD2, 0xD9},	/* "LINUXKR" */
	.prod_fn    = 0xD5D3,			/* "NL" */
	.version_nr = 0xF2F6,			/* "26" */
	.release_nr = 0xF0F1,			/* "01" */
};

/*
 * appldata_diag()
 *
 * prepare parameter list, issue DIAG 0xDC
 */
int appldata_diag(char record_nr, u16 function, unsigned long buffer,
			u16 length, char *mod_lvl)
{
	struct appldata_parameter_list *parm_list;
	struct appldata_product_id *id;
	int rc;

	parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL);
	id = kmemdup(&appldata_id, sizeof(appldata_id), GFP_KERNEL);
	rc = -ENOMEM;
	if (parm_list && id) {
		id->record_nr = record_nr;
		id->mod_lvl = (mod_lvl[0]) << 8 | mod_lvl[1];
		rc = appldata_asm(parm_list, id, function,
				  (void *) buffer, length);
	}
	kfree(id);
	kfree(parm_list);
	return rc;
}
/************************ timer, work, DIAG <END> ****************************/


/****************************** /proc stuff **********************************/

#define APPLDATA_ADD_TIMER	0
#define APPLDATA_DEL_TIMER	1
#define APPLDATA_MOD_TIMER	2

/*
 * __appldata_vtimer_setup()
 *
 * Add, delete or modify virtual timers on all online cpus.
 * The caller needs to get the appldata_timer_lock spinlock.
 */
static void __appldata_vtimer_setup(int cmd)
{
	u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO;

	switch (cmd) {
	case APPLDATA_ADD_TIMER:
		if (appldata_timer_active)
			break;
		appldata_timer.expires = timer_interval;
		add_virt_timer_periodic(&appldata_timer);
		appldata_timer_active = 1;
		break;
	case APPLDATA_DEL_TIMER:
		del_virt_timer(&appldata_timer);
		if (!appldata_timer_active)
			break;
		appldata_timer_active = 0;
		break;
	case APPLDATA_MOD_TIMER:
		if (!appldata_timer_active)
			break;
		mod_virt_timer_periodic(&appldata_timer, timer_interval);
	}
}

/*
 * appldata_timer_handler()
 *
 * Start/Stop timer, show status of timer (0 = not active, 1 = active)
 */
static int
appldata_timer_handler(struct ctl_table *ctl, int write,
			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int timer_active = appldata_timer_active;
	int zero = 0;
	int one = 1;
	int rc;
	struct ctl_table ctl_entry = {
		.procname	= ctl->procname,
		.data		= &timer_active,
		.maxlen		= sizeof(int),
		.extra1		= &zero,
		.extra2		= &one,
	};

	rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	if (rc < 0 || !write)
		return rc;

	spin_lock(&appldata_timer_lock);
	if (timer_active)
		__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
	else
		__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
	spin_unlock(&appldata_timer_lock);
	return 0;
}

/*
 * appldata_interval_handler()
 *
 * Set (CPU) timer interval for collection of data (in milliseconds), show
 * current timer interval.
 */
static int
appldata_interval_handler(struct ctl_table *ctl, int write,
			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int interval = appldata_interval;
	int one = 1;
	int rc;
	struct ctl_table ctl_entry = {
		.procname	= ctl->procname,
		.data		= &interval,
		.maxlen		= sizeof(int),
		.extra1		= &one,
	};

	rc = proc_dointvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	if (rc < 0 || !write)
		return rc;

	spin_lock(&appldata_timer_lock);
	appldata_interval = interval;
	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	spin_unlock(&appldata_timer_lock);
	return 0;
}

/*
 * appldata_generic_handler()
 *
 * Generic start/stop monitoring and DIAG, show status of
 * monitoring (0 = not in process, 1 = in process)
 */
static int
appldata_generic_handler(struct ctl_table *ctl, int write,
			   void __user *buffer, size_t *lenp, loff_t *ppos)
{
	struct appldata_ops *ops = NULL, *tmp_ops;
	struct list_head *lh;
	int rc, found;
	int active;
	int zero = 0;
	int one = 1;
	struct ctl_table ctl_entry = {
		.data		= &active,
		.maxlen		= sizeof(int),
		.extra1		= &zero,
		.extra2		= &one,
	};

	found = 0;
	mutex_lock(&appldata_ops_mutex);
	list_for_each(lh, &appldata_ops_list) {
		tmp_ops = list_entry(lh, struct appldata_ops, list);
		if (&tmp_ops->ctl_table[2] == ctl) {
			found = 1;
		}
	}
	if (!found) {
		mutex_unlock(&appldata_ops_mutex);
		return -ENODEV;
	}
	ops = ctl->data;
	if (!try_module_get(ops->owner)) {	// protect this function
		mutex_unlock(&appldata_ops_mutex);
		return -ENODEV;
	}
	mutex_unlock(&appldata_ops_mutex);

	active = ops->active;
	rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	if (rc < 0 || !write) {
		module_put(ops->owner);
		return rc;
	}

	mutex_lock(&appldata_ops_mutex);
	if (active && (ops->active == 0)) {
		// protect work queue callback
		if (!try_module_get(ops->owner)) {
			mutex_unlock(&appldata_ops_mutex);
			module_put(ops->owner);
			return -ENODEV;
		}
		ops->callback(ops->data);	// init record
		rc = appldata_diag(ops->record_nr,
					APPLDATA_START_INTERVAL_REC,
					(unsigned long) ops->data, ops->size,
					ops->mod_lvl);
		if (rc != 0) {
			pr_err("Starting the data collection for %s "
			       "failed with rc=%d\n", ops->name, rc);
			module_put(ops->owner);
		} else
			ops->active = 1;
	} else if (!active && (ops->active == 1)) {
		ops->active = 0;
		rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
				(unsigned long) ops->data, ops->size,
				ops->mod_lvl);
		if (rc != 0)
			pr_err("Stopping the data collection for %s "
			       "failed with rc=%d\n", ops->name, rc);
		module_put(ops->owner);
	}
	mutex_unlock(&appldata_ops_mutex);
	module_put(ops->owner);
	return 0;
}

/*************************** /proc stuff <END> *******************************/


/************************* module-ops management *****************************/
/*
 * appldata_register_ops()
 *
 * update ops list, register /proc/sys entries
 */
int appldata_register_ops(struct appldata_ops *ops)
{
	if (ops->size > APPLDATA_MAX_REC_SIZE)
		return -EINVAL;

	ops->ctl_table = kcalloc(4, sizeof(struct ctl_table), GFP_KERNEL);
	if (!ops->ctl_table)
		return -ENOMEM;

	mutex_lock(&appldata_ops_mutex);
	list_add(&ops->list, &appldata_ops_list);
	mutex_unlock(&appldata_ops_mutex);

	ops->ctl_table[0].procname = appldata_proc_name;
	ops->ctl_table[0].maxlen   = 0;
	ops->ctl_table[0].mode     = S_IRUGO | S_IXUGO;
	ops->ctl_table[0].child    = &ops->ctl_table[2];

	ops->ctl_table[2].procname = ops->name;
	ops->ctl_table[2].mode     = S_IRUGO | S_IWUSR;
	ops->ctl_table[2].proc_handler = appldata_generic_handler;
	ops->ctl_table[2].data = ops;

	ops->sysctl_header = register_sysctl_table(ops->ctl_table);
	if (!ops->sysctl_header)
		goto out;
	return 0;
out:
	mutex_lock(&appldata_ops_mutex);
	list_del(&ops->list);
	mutex_unlock(&appldata_ops_mutex);
	kfree(ops->ctl_table);
	return -ENOMEM;
}

/*
 * appldata_unregister_ops()
 *
 * update ops list, unregister /proc entries, stop DIAG if necessary
 */
void appldata_unregister_ops(struct appldata_ops *ops)
{
	mutex_lock(&appldata_ops_mutex);
	list_del(&ops->list);
	mutex_unlock(&appldata_ops_mutex);
	unregister_sysctl_table(ops->sysctl_header);
	kfree(ops->ctl_table);
}
/********************** module-ops management <END> **************************/


/**************************** suspend / resume *******************************/
static int appldata_freeze(struct device *dev)
{
	struct appldata_ops *ops;
	int rc;
	struct list_head *lh;

	spin_lock(&appldata_timer_lock);
	if (appldata_timer_active) {
		__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
		appldata_timer_suspended = 1;
	}
	spin_unlock(&appldata_timer_lock);

	mutex_lock(&appldata_ops_mutex);
	list_for_each(lh, &appldata_ops_list) {
		ops = list_entry(lh, struct appldata_ops, list);
		if (ops->active == 1) {
			rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
					(unsigned long) ops->data, ops->size,
					ops->mod_lvl);
			if (rc != 0)
				pr_err("Stopping the data collection for %s "
				       "failed with rc=%d\n", ops->name, rc);
		}
	}
	mutex_unlock(&appldata_ops_mutex);
	return 0;
}

static int appldata_restore(struct device *dev)
{
	struct appldata_ops *ops;
	int rc;
	struct list_head *lh;

	spin_lock(&appldata_timer_lock);
	if (appldata_timer_suspended) {
		__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
		appldata_timer_suspended = 0;
	}
	spin_unlock(&appldata_timer_lock);

	mutex_lock(&appldata_ops_mutex);
	list_for_each(lh, &appldata_ops_list) {
		ops = list_entry(lh, struct appldata_ops, list);
		if (ops->active == 1) {
			ops->callback(ops->data);	// init record
			rc = appldata_diag(ops->record_nr,
					APPLDATA_START_INTERVAL_REC,
					(unsigned long) ops->data, ops->size,
					ops->mod_lvl);
			if (rc != 0) {
				pr_err("Starting the data collection for %s "
				       "failed with rc=%d\n", ops->name, rc);
			}
		}
	}
	mutex_unlock(&appldata_ops_mutex);
	return 0;
}

static int appldata_thaw(struct device *dev)
{
	return appldata_restore(dev);
}

static const struct dev_pm_ops appldata_pm_ops = {
	.freeze		= appldata_freeze,
	.thaw		= appldata_thaw,
	.restore	= appldata_restore,
};

static struct platform_driver appldata_pdrv = {
	.driver = {
		.name	= "appldata",
		.pm	= &appldata_pm_ops,
	},
};
/************************* suspend / resume <END> ****************************/


/******************************* init / exit *********************************/

/*
 * appldata_init()
 *
 * init timer, register /proc entries
 */
static int __init appldata_init(void)
{
	int rc;

	init_virt_timer(&appldata_timer);
	appldata_timer.function = appldata_timer_function;
	appldata_timer.data = (unsigned long) &appldata_work;

	rc = platform_driver_register(&appldata_pdrv);
	if (rc)
		return rc;

	appldata_pdev = platform_device_register_simple("appldata", -1, NULL,
							0);
	if (IS_ERR(appldata_pdev)) {
		rc = PTR_ERR(appldata_pdev);
		goto out_driver;
	}
	appldata_wq = alloc_ordered_workqueue("appldata", 0);
	if (!appldata_wq) {
		rc = -ENOMEM;
		goto out_device;
	}

	appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
	return 0;

out_device:
	platform_device_unregister(appldata_pdev);
out_driver:
	platform_driver_unregister(&appldata_pdrv);
	return rc;
}

__initcall(appldata_init);

/**************************** init / exit <END> ******************************/

EXPORT_SYMBOL_GPL(appldata_register_ops);
EXPORT_SYMBOL_GPL(appldata_unregister_ops);
EXPORT_SYMBOL_GPL(appldata_diag);

#ifdef CONFIG_SWAP
EXPORT_SYMBOL_GPL(si_swapinfo);
#endif
EXPORT_SYMBOL_GPL(nr_threads);
EXPORT_SYMBOL_GPL(nr_running);
EXPORT_SYMBOL_GPL(nr_iowait);
Commit	Line	Data
0caa8cdf	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	3	* Base infrastructure for Linux-z/VM Monitor Stream, Stage 1.
	4	* Exports appldata_register_ops() and appldata_unregister_ops() for the
	5	* data gathering modules.
	6	*
524dbcda	7	* Copyright IBM Corp. 2003, 2009
1da177e4	8	*
5b5dd21a	9	* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
1da177e4 LT	10	*/
1da177e4 LT	11
e7534b0e GS	12	#define KMSG_COMPONENT "appldata"
	13	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	14
1da177e4	15	#include <linux/module.h>
3605df49	16	#include <linux/sched/stat.h>
1da177e4 LT	17	#include <linux/init.h>
	18	#include <linux/slab.h>
	19	#include <linux/errno.h>
1da177e4 LT	20	#include <linux/interrupt.h>
1da177e4 LT	21	#include <linux/proc_fs.h>
2dcea57a	22	#include <linux/mm.h>
1da177e4 LT	23	#include <linux/swap.h>
	24	#include <linux/pagemap.h>
	25	#include <linux/sysctl.h>
1da177e4 LT	26	#include <linux/notifier.h>
1da177e4 LT	27	#include <linux/cpu.h>
f26d583e	28	#include <linux/workqueue.h>
524dbcda GS	29	#include <linux/suspend.h>
524dbcda GS	30	#include <linux/platform_device.h>
1f38d613	31	#include <asm/appldata.h>
27f6b416	32	#include <asm/vtimer.h>
7c0f6ba6	33	#include <linux/uaccess.h>
1f38d613 GS	34	#include <asm/io.h>
1f38d613 GS	35	#include <asm/smp.h>
1da177e4 LT	36
	37	#include "appldata.h"
	38
	39
1da177e4 LT	40	#define APPLDATA_CPU_INTERVAL 10000 /* default (CPU) time for
	41	sampling interval in
	42	milliseconds */
	43
	44	#define TOD_MICRO 0x01000 /* nr. of TOD clock units
	45	for 1 microsecond */
524dbcda GS	46
	47	static struct platform_device *appldata_pdev;
	48
1da177e4 LT	49	/*
	50	* /proc entries (sysctl)
	51	*/
	52	static const char appldata_proc_name[APPLDATA_PROC_NAME_LENGTH] = "appldata";
302bfe20	53	static int appldata_timer_handler(struct ctl_table *ctl, int write,
1da177e4	54	void __user buffer, size_t lenp, loff_t *ppos);
302bfe20	55	static int appldata_interval_handler(struct ctl_table *ctl, int write,
1da177e4 LT	56	void __user *buffer,
	57	size_t lenp, loff_t ppos);
	58
	59	static struct ctl_table_header *appldata_sysctl_header;
	60	static struct ctl_table appldata_table[] = {
	61	{
1da177e4 LT	62	.procname = "timer",
1da177e4 LT	63	.mode = S_IRUGO \| S_IWUSR,
6d456111	64	.proc_handler = appldata_timer_handler,
1da177e4 LT	65	},
1da177e4 LT	66	{
1da177e4 LT	67	.procname = "interval",
1da177e4 LT	68	.mode = S_IRUGO \| S_IWUSR,
6d456111	69	.proc_handler = appldata_interval_handler,
1da177e4	70	},
37e3a6ac	71	{ },
1da177e4 LT	72	};
	73
	74	static struct ctl_table appldata_dir_table[] = {
	75	{
1da177e4 LT	76	.procname = appldata_proc_name,
	77	.maxlen = 0,
	78	.mode = S_IRUGO \| S_IXUGO,
	79	.child = appldata_table,
	80	},
37e3a6ac	81	{ },
1da177e4 LT	82	};
	83
	84	/*
	85	* Timer
	86	*/
27f6b416	87	static struct vtimer_list appldata_timer;
1da177e4 LT	88
	89	static DEFINE_SPINLOCK(appldata_timer_lock);
	90	static int appldata_interval = APPLDATA_CPU_INTERVAL;
	91	static int appldata_timer_active;
524dbcda	92	static int appldata_timer_suspended = 0;
1da177e4 LT	93
1da177e4 LT	94	/*
f26d583e	95	* Work queue
1da177e4	96	*/
f26d583e	97	static struct workqueue_struct *appldata_wq;
6d5aefb8 DH	98	static void appldata_work_fn(struct work_struct *work);
6d5aefb8 DH	99	static DECLARE_WORK(appldata_work, appldata_work_fn);
f26d583e	100
1da177e4 LT	101
	102	/*
	103	* Ops list
	104	*/
b1ad171e	105	static DEFINE_MUTEX(appldata_ops_mutex);
1da177e4 LT	106	static LIST_HEAD(appldata_ops_list);
	107
	108
f26d583e	109	/************************* timer, work, DIAG *****************************/
1da177e4 LT	110	/*
	111	* appldata_timer_function()
	112	*
f26d583e	113	* schedule work and reschedule timer
1da177e4	114	*/
9d0a57cb	115	static void appldata_timer_function(unsigned long data)
1da177e4	116	{
27f6b416	117	queue_work(appldata_wq, (struct work_struct *) data);
1da177e4 LT	118	}
	119
	120	/*
f26d583e	121	* appldata_work_fn()
1da177e4 LT	122	*
	123	* call data gathering function for each (active) module
	124	*/
6d5aefb8	125	static void appldata_work_fn(struct work_struct *work)
1da177e4 LT	126	{
	127	struct list_head *lh;
	128	struct appldata_ops *ops;
1da177e4	129
b1ad171e	130	mutex_lock(&appldata_ops_mutex);
1da177e4 LT	131	list_for_each(lh, &appldata_ops_list) {
1da177e4 LT	132	ops = list_entry(lh, struct appldata_ops, list);
1da177e4 LT	133	if (ops->active == 1) {
	134	ops->callback(ops->data);
	135	}
	136	}
b1ad171e	137	mutex_unlock(&appldata_ops_mutex);
1da177e4 LT	138	}
1da177e4 LT	139
d36a9281 MS	140	static struct appldata_product_id appldata_id = {
	141	.prod_nr = {0xD3, 0xC9, 0xD5, 0xE4,
	142	0xE7, 0xD2, 0xD9}, /* "LINUXKR" */
	143	.prod_fn = 0xD5D3, /* "NL" */
	144	.version_nr = 0xF2F6, /* "26" */
	145	.release_nr = 0xF0F1, /* "01" */
	146	};
	147
1da177e4 LT	148	/*
	149	* appldata_diag()
	150	*
	151	* prepare parameter list, issue DIAG 0xDC
	152	*/
5b5dd21a GS	153	int appldata_diag(char record_nr, u16 function, unsigned long buffer,
5b5dd21a GS	154	u16 length, char *mod_lvl)
1da177e4	155	{
d36a9281 MS	156	struct appldata_parameter_list *parm_list;
	157	struct appldata_product_id *id;
	158	int rc;
	159
	160	parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL);
	161	id = kmemdup(&appldata_id, sizeof(appldata_id), GFP_KERNEL);
	162	rc = -ENOMEM;
	163	if (parm_list && id) {
	164	id->record_nr = record_nr;
	165	id->mod_lvl = (mod_lvl[0]) << 8 \| mod_lvl[1];
	166	rc = appldata_asm(parm_list, id, function,
	167	(void *) buffer, length);
	168	}
	169	kfree(id);
	170	kfree(parm_list);
	171	return rc;
1da177e4	172	}
f26d583e	173	/********************** timer, work, DIAG <END> **************************/
1da177e4 LT	174
	175
	176	/**************************** /proc stuff ********************************/
	177
1da177e4 LT	178	#define APPLDATA_ADD_TIMER 0
	179	#define APPLDATA_DEL_TIMER 1
	180	#define APPLDATA_MOD_TIMER 2
	181
	182	/*
	183	* __appldata_vtimer_setup()
	184	*
	185	* Add, delete or modify virtual timers on all online cpus.
	186	* The caller needs to get the appldata_timer_lock spinlock.
	187	*/
27f6b416	188	static void __appldata_vtimer_setup(int cmd)
1da177e4	189	{
27f6b416	190	u64 timer_interval = (u64) appldata_interval * 1000 * TOD_MICRO;
1da177e4 LT	191
	192	switch (cmd) {
	193	case APPLDATA_ADD_TIMER:
	194	if (appldata_timer_active)
	195	break;
27f6b416 MS	196	appldata_timer.expires = timer_interval;
27f6b416 MS	197	add_virt_timer_periodic(&appldata_timer);
1da177e4	198	appldata_timer_active = 1;
1da177e4 LT	199	break;
1da177e4 LT	200	case APPLDATA_DEL_TIMER:
27f6b416	201	del_virt_timer(&appldata_timer);
1da177e4 LT	202	if (!appldata_timer_active)
	203	break;
	204	appldata_timer_active = 0;
1da177e4 LT	205	break;
1da177e4 LT	206	case APPLDATA_MOD_TIMER:
1da177e4 LT	207	if (!appldata_timer_active)
1da177e4 LT	208	break;
27f6b416	209	mod_virt_timer_periodic(&appldata_timer, timer_interval);
1da177e4 LT	210	}
	211	}
	212
	213	/*
	214	* appldata_timer_handler()
	215	*
	216	* Start/Stop timer, show status of timer (0 = not active, 1 = active)
	217	*/
	218	static int
302bfe20	219	appldata_timer_handler(struct ctl_table *ctl, int write,
1da177e4 LT	220	void __user buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	221	{
6c802150 VG	222	int timer_active = appldata_timer_active;
	223	int zero = 0;
	224	int one = 1;
	225	int rc;
	226	struct ctl_table ctl_entry = {
	227	.procname = ctl->procname,
	228	.data = &timer_active,
	229	.maxlen = sizeof(int),
	230	.extra1 = &zero,
	231	.extra2 = &one,
	232	};
	233
	234	rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	235	if (rc < 0 \|\| !write)
	236	return rc;
1da177e4	237
1da177e4	238	spin_lock(&appldata_timer_lock);
6c802150	239	if (timer_active)
1da177e4	240	__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
6c802150	241	else
1da177e4 LT	242	__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
1da177e4 LT	243	spin_unlock(&appldata_timer_lock);
1da177e4 LT	244	return 0;
	245	}
	246
	247	/*
	248	* appldata_interval_handler()
	249	*
	250	* Set (CPU) timer interval for collection of data (in milliseconds), show
	251	* current timer interval.
	252	*/
	253	static int
302bfe20	254	appldata_interval_handler(struct ctl_table *ctl, int write,
1da177e4 LT	255	void __user buffer, size_t lenp, loff_t *ppos)
1da177e4 LT	256	{
6c802150 VG	257	int interval = appldata_interval;
	258	int one = 1;
	259	int rc;
	260	struct ctl_table ctl_entry = {
	261	.procname = ctl->procname,
	262	.data = &interval,
	263	.maxlen = sizeof(int),
	264	.extra1 = &one,
	265	};
1da177e4	266
6c802150 VG	267	rc = proc_dointvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	268	if (rc < 0 \|\| !write)
	269	return rc;
1da177e4 LT	270
	271	spin_lock(&appldata_timer_lock);
	272	appldata_interval = interval;
	273	__appldata_vtimer_setup(APPLDATA_MOD_TIMER);
	274	spin_unlock(&appldata_timer_lock);
1da177e4 LT	275	return 0;
	276	}
	277
	278	/*
	279	* appldata_generic_handler()
	280	*
	281	* Generic start/stop monitoring and DIAG, show status of
	282	* monitoring (0 = not in process, 1 = in process)
	283	*/
	284	static int
302bfe20	285	appldata_generic_handler(struct ctl_table *ctl, int write,
1da177e4 LT	286	void __user buffer, size_t lenp, loff_t *ppos)
	287	{
	288	struct appldata_ops ops = NULL, tmp_ops;
1da177e4	289	struct list_head *lh;
6c802150 VG	290	int rc, found;
	291	int active;
	292	int zero = 0;
	293	int one = 1;
	294	struct ctl_table ctl_entry = {
	295	.data = &active,
	296	.maxlen = sizeof(int),
	297	.extra1 = &zero,
	298	.extra2 = &one,
	299	};
1da177e4 LT	300
1da177e4 LT	301	found = 0;
b1ad171e	302	mutex_lock(&appldata_ops_mutex);
1da177e4 LT	303	list_for_each(lh, &appldata_ops_list) {
	304	tmp_ops = list_entry(lh, struct appldata_ops, list);
	305	if (&tmp_ops->ctl_table[2] == ctl) {
	306	found = 1;
	307	}
	308	}
	309	if (!found) {
b1ad171e	310	mutex_unlock(&appldata_ops_mutex);
1da177e4 LT	311	return -ENODEV;
	312	}
	313	ops = ctl->data;
	314	if (!try_module_get(ops->owner)) { // protect this function
b1ad171e	315	mutex_unlock(&appldata_ops_mutex);
1da177e4 LT	316	return -ENODEV;
1da177e4 LT	317	}
b1ad171e	318	mutex_unlock(&appldata_ops_mutex);
1da177e4	319
6c802150 VG	320	active = ops->active;
	321	rc = proc_douintvec_minmax(&ctl_entry, write, buffer, lenp, ppos);
	322	if (rc < 0 \|\| !write) {
1da177e4	323	module_put(ops->owner);
6c802150	324	return rc;
1da177e4 LT	325	}
1da177e4 LT	326
b1ad171e	327	mutex_lock(&appldata_ops_mutex);
6c802150	328	if (active && (ops->active == 0)) {
f26d583e GS	329	// protect work queue callback
f26d583e GS	330	if (!try_module_get(ops->owner)) {
b1ad171e	331	mutex_unlock(&appldata_ops_mutex);
1da177e4 LT	332	module_put(ops->owner);
	333	return -ENODEV;
	334	}
1da177e4 LT	335	ops->callback(ops->data); // init record
	336	rc = appldata_diag(ops->record_nr,
	337	APPLDATA_START_INTERVAL_REC,
5b5dd21a GS	338	(unsigned long) ops->data, ops->size,
5b5dd21a GS	339	ops->mod_lvl);
1da177e4	340	if (rc != 0) {
e7534b0e GS	341	pr_err("Starting the data collection for %s "
e7534b0e GS	342	"failed with rc=%d\n", ops->name, rc);
1da177e4	343	module_put(ops->owner);
d3ae942d	344	} else
5b5dd21a	345	ops->active = 1;
6c802150	346	} else if (!active && (ops->active == 1)) {
1da177e4 LT	347	ops->active = 0;
1da177e4 LT	348	rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
5b5dd21a GS	349	(unsigned long) ops->data, ops->size,
5b5dd21a GS	350	ops->mod_lvl);
d3ae942d	351	if (rc != 0)
e7534b0e GS	352	pr_err("Stopping the data collection for %s "
e7534b0e GS	353	"failed with rc=%d\n", ops->name, rc);
1da177e4 LT	354	module_put(ops->owner);
1da177e4 LT	355	}
b1ad171e	356	mutex_unlock(&appldata_ops_mutex);
1da177e4 LT	357	module_put(ops->owner);
	358	return 0;
	359	}
	360
	361	/************************* /proc stuff <END> *****************************/
	362
	363
	364	/*********************** module-ops management ***************************/
	365	/*
	366	* appldata_register_ops()
	367	*
	368	* update ops list, register /proc/sys entries
	369	*/
	370	int appldata_register_ops(struct appldata_ops *ops)
	371	{
13f8b7c5	372	if (ops->size > APPLDATA_MAX_REC_SIZE)
37e3a6ac	373	return -EINVAL;
1da177e4	374
6396bb22	375	ops->ctl_table = kcalloc(4, sizeof(struct ctl_table), GFP_KERNEL);
37e3a6ac	376	if (!ops->ctl_table)
1da177e4	377	return -ENOMEM;
1da177e4	378
b1ad171e	379	mutex_lock(&appldata_ops_mutex);
1da177e4	380	list_add(&ops->list, &appldata_ops_list);
b1ad171e	381	mutex_unlock(&appldata_ops_mutex);
1da177e4	382
1da177e4 LT	383	ops->ctl_table[0].procname = appldata_proc_name;
	384	ops->ctl_table[0].maxlen = 0;
	385	ops->ctl_table[0].mode = S_IRUGO \| S_IXUGO;
	386	ops->ctl_table[0].child = &ops->ctl_table[2];
	387
1da177e4 LT	388	ops->ctl_table[2].procname = ops->name;
	389	ops->ctl_table[2].mode = S_IRUGO \| S_IWUSR;
	390	ops->ctl_table[2].proc_handler = appldata_generic_handler;
	391	ops->ctl_table[2].data = ops;
	392
0b4d4147	393	ops->sysctl_header = register_sysctl_table(ops->ctl_table);
37e3a6ac HC	394	if (!ops->sysctl_header)
37e3a6ac HC	395	goto out;
1da177e4	396	return 0;
37e3a6ac	397	out:
b1ad171e	398	mutex_lock(&appldata_ops_mutex);
37e3a6ac	399	list_del(&ops->list);
b1ad171e	400	mutex_unlock(&appldata_ops_mutex);
37e3a6ac HC	401	kfree(ops->ctl_table);
37e3a6ac HC	402	return -ENOMEM;
1da177e4 LT	403	}
	404
	405	/*
	406	* appldata_unregister_ops()
	407	*
	408	* update ops list, unregister /proc entries, stop DIAG if necessary
	409	*/
	410	void appldata_unregister_ops(struct appldata_ops *ops)
	411	{
b1ad171e	412	mutex_lock(&appldata_ops_mutex);
1da177e4	413	list_del(&ops->list);
b1ad171e	414	mutex_unlock(&appldata_ops_mutex);
330d57fb	415	unregister_sysctl_table(ops->sysctl_header);
37e3a6ac	416	kfree(ops->ctl_table);
1da177e4 LT	417	}
	418	/******************** module-ops management <END> ************************/
	419
	420
524dbcda GS	421	/************************** suspend / resume *****************************/
	422	static int appldata_freeze(struct device *dev)
	423	{
	424	struct appldata_ops *ops;
	425	int rc;
	426	struct list_head *lh;
	427
524dbcda GS	428	spin_lock(&appldata_timer_lock);
	429	if (appldata_timer_active) {
	430	__appldata_vtimer_setup(APPLDATA_DEL_TIMER);
	431	appldata_timer_suspended = 1;
	432	}
	433	spin_unlock(&appldata_timer_lock);
524dbcda GS	434
	435	mutex_lock(&appldata_ops_mutex);
	436	list_for_each(lh, &appldata_ops_list) {
	437	ops = list_entry(lh, struct appldata_ops, list);
	438	if (ops->active == 1) {
	439	rc = appldata_diag(ops->record_nr, APPLDATA_STOP_REC,
	440	(unsigned long) ops->data, ops->size,
	441	ops->mod_lvl);
	442	if (rc != 0)
	443	pr_err("Stopping the data collection for %s "
	444	"failed with rc=%d\n", ops->name, rc);
	445	}
	446	}
	447	mutex_unlock(&appldata_ops_mutex);
	448	return 0;
	449	}
	450
	451	static int appldata_restore(struct device *dev)
	452	{
	453	struct appldata_ops *ops;
	454	int rc;
	455	struct list_head *lh;
	456
524dbcda GS	457	spin_lock(&appldata_timer_lock);
	458	if (appldata_timer_suspended) {
	459	__appldata_vtimer_setup(APPLDATA_ADD_TIMER);
	460	appldata_timer_suspended = 0;
	461	}
	462	spin_unlock(&appldata_timer_lock);
524dbcda GS	463
	464	mutex_lock(&appldata_ops_mutex);
	465	list_for_each(lh, &appldata_ops_list) {
	466	ops = list_entry(lh, struct appldata_ops, list);
	467	if (ops->active == 1) {
	468	ops->callback(ops->data); // init record
	469	rc = appldata_diag(ops->record_nr,
	470	APPLDATA_START_INTERVAL_REC,
	471	(unsigned long) ops->data, ops->size,
	472	ops->mod_lvl);
	473	if (rc != 0) {
	474	pr_err("Starting the data collection for %s "
	475	"failed with rc=%d\n", ops->name, rc);
	476	}
	477	}
	478	}
	479	mutex_unlock(&appldata_ops_mutex);
	480	return 0;
	481	}
	482
	483	static int appldata_thaw(struct device *dev)
	484	{
	485	return appldata_restore(dev);
	486	}
	487
47145210	488	static const struct dev_pm_ops appldata_pm_ops = {
524dbcda GS	489	.freeze = appldata_freeze,
	490	.thaw = appldata_thaw,
	491	.restore = appldata_restore,
	492	};
	493
	494	static struct platform_driver appldata_pdrv = {
	495	.driver = {
	496	.name = "appldata",
524dbcda GS	497	.pm = &appldata_pm_ops,
	498	},
	499	};
	500	/*********************** suspend / resume <END> **************************/
	501
	502
1da177e4 LT	503	/***************************** init / exit *******************************/
1da177e4 LT	504
1da177e4 LT	505	/*
	506	* appldata_init()
	507	*
f26d583e	508	* init timer, register /proc entries
1da177e4 LT	509	*/
	510	static int __init appldata_init(void)
	511	{
27f6b416 MS	512	int rc;
27f6b416 MS	513
b7c5b1aa	514	init_virt_timer(&appldata_timer);
27f6b416 MS	515	appldata_timer.function = appldata_timer_function;
27f6b416 MS	516	appldata_timer.data = (unsigned long) &appldata_work;
524dbcda GS	517
	518	rc = platform_driver_register(&appldata_pdrv);
	519	if (rc)
	520	return rc;
1da177e4	521
524dbcda GS	522	appldata_pdev = platform_device_register_simple("appldata", -1, NULL,
	523	0);
	524	if (IS_ERR(appldata_pdev)) {
	525	rc = PTR_ERR(appldata_pdev);
	526	goto out_driver;
	527	}
e68f1d4c	528	appldata_wq = alloc_ordered_workqueue("appldata", 0);
524dbcda GS	529	if (!appldata_wq) {
	530	rc = -ENOMEM;
	531	goto out_device;
	532	}
f26d583e	533
0b4d4147	534	appldata_sysctl_header = register_sysctl_table(appldata_dir_table);
1da177e4	535	return 0;
524dbcda GS	536
	537	out_device:
	538	platform_device_unregister(appldata_pdev);
	539	out_driver:
	540	platform_driver_unregister(&appldata_pdrv);
	541	return rc;
1da177e4 LT	542	}
1da177e4 LT	543
076fc808	544	__initcall(appldata_init);
1da177e4	545
1da177e4 LT	546	/************************** init / exit <END> ****************************/
1da177e4 LT	547
1da177e4 LT	548	EXPORT_SYMBOL_GPL(appldata_register_ops);
1da177e4 LT	549	EXPORT_SYMBOL_GPL(appldata_unregister_ops);
5b5dd21a	550	EXPORT_SYMBOL_GPL(appldata_diag);
1da177e4	551
0c3252d5	552	#ifdef CONFIG_SWAP
1da177e4	553	EXPORT_SYMBOL_GPL(si_swapinfo);
0c3252d5	554	#endif
1da177e4	555	EXPORT_SYMBOL_GPL(nr_threads);
1da177e4 LT	556	EXPORT_SYMBOL_GPL(nr_running);
1da177e4 LT	557	EXPORT_SYMBOL_GPL(nr_iowait);