[linux-2.6-block.git] / drivers / s390 / char / monwriter.c

/*
 * Character device driver for writing z/VM *MONITOR service records.
 *
 * Copyright IBM Corp. 2006, 2009
 *
 * Author(s): Melissa Howland <Melissa.Howland@us.ibm.com>
 */

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

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/ctype.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/appldata.h>
#include <asm/monwriter.h>

#define MONWRITE_MAX_DATALEN	4010

static int mon_max_bufs = 255;
static int mon_buf_count;

struct mon_buf {
	struct list_head list;
	struct monwrite_hdr hdr;
	int diag_done;
	char *data;
};

static LIST_HEAD(mon_priv_list);

struct mon_private {
	struct list_head priv_list;
	struct list_head list;
	struct monwrite_hdr hdr;
	size_t hdr_to_read;
	size_t data_to_read;
	struct mon_buf *current_buf;
	struct mutex thread_mutex;
};

/*
 * helper functions
 */

static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn)
{
	struct appldata_product_id id;
	int rc;

	strcpy(id.prod_nr, "LNXAPPL");
	id.prod_fn = myhdr->applid;
	id.record_nr = myhdr->record_num;
	id.version_nr = myhdr->version;
	id.release_nr = myhdr->release;
	id.mod_lvl = myhdr->mod_level;
	rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen);
	if (rc <= 0)
		return rc;
	pr_err("Writing monitor data failed with rc=%i\n", rc);
	if (rc == 5)
		return -EPERM;
	return -EINVAL;
}

static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv,
					 struct monwrite_hdr *monhdr)
{
	struct mon_buf *entry, *next;

	list_for_each_entry_safe(entry, next, &monpriv->list, list)
		if ((entry->hdr.mon_function == monhdr->mon_function ||
		     monhdr->mon_function == MONWRITE_STOP_INTERVAL) &&
		    entry->hdr.applid == monhdr->applid &&
		    entry->hdr.record_num == monhdr->record_num &&
		    entry->hdr.version == monhdr->version &&
		    entry->hdr.release == monhdr->release &&
		    entry->hdr.mod_level == monhdr->mod_level)
			return entry;

	return NULL;
}

static int monwrite_new_hdr(struct mon_private *monpriv)
{
	struct monwrite_hdr *monhdr = &monpriv->hdr;
	struct mon_buf *monbuf;
	int rc;

	if (monhdr->datalen > MONWRITE_MAX_DATALEN ||
	    monhdr->mon_function > MONWRITE_START_CONFIG ||
	    monhdr->hdrlen != sizeof(struct monwrite_hdr))
		return -EINVAL;
	monbuf = NULL;
	if (monhdr->mon_function != MONWRITE_GEN_EVENT)
		monbuf = monwrite_find_hdr(monpriv, monhdr);
	if (monbuf) {
		if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) {
			monhdr->datalen = monbuf->hdr.datalen;
			rc = monwrite_diag(monhdr, monbuf->data,
					   APPLDATA_STOP_REC);
			list_del(&monbuf->list);
			mon_buf_count--;
			kfree(monbuf->data);
			kfree(monbuf);
			monbuf = NULL;
		}
	} else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) {
		if (mon_buf_count >= mon_max_bufs)
			return -ENOSPC;
		monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL);
		if (!monbuf)
			return -ENOMEM;
		monbuf->data = kzalloc(monhdr->datalen,
				       GFP_KERNEL | GFP_DMA);
		if (!monbuf->data) {
			kfree(monbuf);
			return -ENOMEM;
		}
		monbuf->hdr = *monhdr;
		list_add_tail(&monbuf->list, &monpriv->list);
		if (monhdr->mon_function != MONWRITE_GEN_EVENT)
			mon_buf_count++;
	}
	monpriv->current_buf = monbuf;
	return 0;
}

static int monwrite_new_data(struct mon_private *monpriv)
{
	struct monwrite_hdr *monhdr = &monpriv->hdr;
	struct mon_buf *monbuf = monpriv->current_buf;
	int rc = 0;

	switch (monhdr->mon_function) {
	case MONWRITE_START_INTERVAL:
		if (!monbuf->diag_done) {
			rc = monwrite_diag(monhdr, monbuf->data,
					   APPLDATA_START_INTERVAL_REC);
			monbuf->diag_done = 1;
		}
		break;
	case MONWRITE_START_CONFIG:
		if (!monbuf->diag_done) {
			rc = monwrite_diag(monhdr, monbuf->data,
					   APPLDATA_START_CONFIG_REC);
			monbuf->diag_done = 1;
		}
		break;
	case MONWRITE_GEN_EVENT:
		rc = monwrite_diag(monhdr, monbuf->data,
				   APPLDATA_GEN_EVENT_REC);
		list_del(&monpriv->current_buf->list);
		kfree(monpriv->current_buf->data);
		kfree(monpriv->current_buf);
		monpriv->current_buf = NULL;
		break;
	default:
		/* monhdr->mon_function is checked in monwrite_new_hdr */
		BUG();
	}
	return rc;
}

/*
 * file operations
 */

static int monwrite_open(struct inode *inode, struct file *filp)
{
	struct mon_private *monpriv;

	monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL);
	if (!monpriv)
		return -ENOMEM;
	INIT_LIST_HEAD(&monpriv->list);
	monpriv->hdr_to_read = sizeof(monpriv->hdr);
	mutex_init(&monpriv->thread_mutex);
	filp->private_data = monpriv;
	list_add_tail(&monpriv->priv_list, &mon_priv_list);
	return nonseekable_open(inode, filp);
}

static int monwrite_close(struct inode *inode, struct file *filp)
{
	struct mon_private *monpriv = filp->private_data;
	struct mon_buf *entry, *next;

	list_for_each_entry_safe(entry, next, &monpriv->list, list) {
		if (entry->hdr.mon_function != MONWRITE_GEN_EVENT)
			monwrite_diag(&entry->hdr, entry->data,
				      APPLDATA_STOP_REC);
		mon_buf_count--;
		list_del(&entry->list);
		kfree(entry->data);
		kfree(entry);
	}
	list_del(&monpriv->priv_list);
	kfree(monpriv);
	return 0;
}

static ssize_t monwrite_write(struct file *filp, const char __user *data,
			      size_t count, loff_t *ppos)
{
	struct mon_private *monpriv = filp->private_data;
	size_t len, written;
	void *to;
	int rc;

	mutex_lock(&monpriv->thread_mutex);
	for (written = 0; written < count; ) {
		if (monpriv->hdr_to_read) {
			len = min(count - written, monpriv->hdr_to_read);
			to = (char *) &monpriv->hdr +
				sizeof(monpriv->hdr) - monpriv->hdr_to_read;
			if (copy_from_user(to, data + written, len)) {
				rc = -EFAULT;
				goto out_error;
			}
			monpriv->hdr_to_read -= len;
			written += len;
			if (monpriv->hdr_to_read > 0)
				continue;
			rc = monwrite_new_hdr(monpriv);
			if (rc)
				goto out_error;
			monpriv->data_to_read = monpriv->current_buf ?
				monpriv->current_buf->hdr.datalen : 0;
		}

		if (monpriv->data_to_read) {
			len = min(count - written, monpriv->data_to_read);
			to = monpriv->current_buf->data +
				monpriv->hdr.datalen - monpriv->data_to_read;
			if (copy_from_user(to, data + written, len)) {
				rc = -EFAULT;
				goto out_error;
			}
			monpriv->data_to_read -= len;
			written += len;
			if (monpriv->data_to_read > 0)
				continue;
			rc = monwrite_new_data(monpriv);
			if (rc)
				goto out_error;
		}
		monpriv->hdr_to_read = sizeof(monpriv->hdr);
	}
	mutex_unlock(&monpriv->thread_mutex);
	return written;

out_error:
	monpriv->data_to_read = 0;
	monpriv->hdr_to_read = sizeof(struct monwrite_hdr);
	mutex_unlock(&monpriv->thread_mutex);
	return rc;
}

static const struct file_operations monwrite_fops = {
	.owner	 = THIS_MODULE,
	.open	 = &monwrite_open,
	.release = &monwrite_close,
	.write	 = &monwrite_write,
};

static struct miscdevice mon_dev = {
	.name	= "monwriter",
	.fops	= &monwrite_fops,
	.minor	= MISC_DYNAMIC_MINOR,
};

/*
 * suspend/resume
 */

static int monwriter_freeze(struct device *dev)
{
	struct mon_private *monpriv;
	struct mon_buf *monbuf;

	list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
		list_for_each_entry(monbuf, &monpriv->list, list) {
			if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT)
				monwrite_diag(&monbuf->hdr, monbuf->data,
					      APPLDATA_STOP_REC);
		}
	}
	return 0;
}

static int monwriter_restore(struct device *dev)
{
	struct mon_private *monpriv;
	struct mon_buf *monbuf;

	list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
		list_for_each_entry(monbuf, &monpriv->list, list) {
			if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL)
				monwrite_diag(&monbuf->hdr, monbuf->data,
					      APPLDATA_START_INTERVAL_REC);
			if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG)
				monwrite_diag(&monbuf->hdr, monbuf->data,
					      APPLDATA_START_CONFIG_REC);
		}
	}
	return 0;
}

static int monwriter_thaw(struct device *dev)
{
	return monwriter_restore(dev);
}

static const struct dev_pm_ops monwriter_pm_ops = {
	.freeze		= monwriter_freeze,
	.thaw		= monwriter_thaw,
	.restore	= monwriter_restore,
};

static struct platform_driver monwriter_pdrv = {
	.driver = {
		.name	= "monwriter",
		.owner	= THIS_MODULE,
		.pm	= &monwriter_pm_ops,
	},
};

static struct platform_device *monwriter_pdev;

/*
 * module init/exit
 */

static int __init mon_init(void)
{
	int rc;

	if (!MACHINE_IS_VM)
		return -ENODEV;

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

	monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL,
							0);
	if (IS_ERR(monwriter_pdev)) {
		rc = PTR_ERR(monwriter_pdev);
		goto out_driver;
	}

	/*
	 * misc_register() has to be the last action in module_init(), because
	 * file operations will be available right after this.
	 */
	rc = misc_register(&mon_dev);
	if (rc)
		goto out_device;
	return 0;

out_device:
	platform_device_unregister(monwriter_pdev);
out_driver:
	platform_driver_unregister(&monwriter_pdrv);
	return rc;
}

static void __exit mon_exit(void)
{
	WARN_ON(misc_deregister(&mon_dev) != 0);
	platform_device_unregister(monwriter_pdev);
	platform_driver_unregister(&monwriter_pdrv);
}

module_init(mon_init);
module_exit(mon_exit);

module_param_named(max_bufs, mon_max_bufs, int, 0644);
MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers "
		 "that can be active at one time");

MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>");
MODULE_DESCRIPTION("Character device driver for writing z/VM "
		   "APPLDATA monitor records.");
MODULE_LICENSE("GPL");
Commit	Line	Data
31b58088	1	/*
31b58088 MH	2	* Character device driver for writing z/VM *MONITOR service records.
31b58088 MH	3	*
fb78140c	4	* Copyright IBM Corp. 2006, 2009
31b58088 MH	5	*
	6	* Author(s): Melissa Howland <Melissa.Howland@us.ibm.com>
	7	*/
	8
1519c0c6 MH	9	#define KMSG_COMPONENT "monwriter"
	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	11
31b58088 MH	12	#include <linux/module.h>
	13	#include <linux/moduleparam.h>
	14	#include <linux/init.h>
	15	#include <linux/errno.h>
	16	#include <linux/types.h>
	17	#include <linux/kernel.h>
	18	#include <linux/miscdevice.h>
	19	#include <linux/ctype.h>
	20	#include <linux/poll.h>
cbea66d9	21	#include <linux/mutex.h>
fb78140c	22	#include <linux/platform_device.h>
5a0e3ad6	23	#include <linux/slab.h>
31b58088 MH	24	#include <asm/uaccess.h>
	25	#include <asm/ebcdic.h>
	26	#include <asm/io.h>
	27	#include <asm/appldata.h>
	28	#include <asm/monwriter.h>
	29
524a237e	30	#define MONWRITE_MAX_DATALEN 4010
31b58088 MH	31
31b58088 MH	32	static int mon_max_bufs = 255;
2d103d5a	33	static int mon_buf_count;
31b58088 MH	34
	35	struct mon_buf {
	36	struct list_head list;
	37	struct monwrite_hdr hdr;
	38	int diag_done;
	39	char *data;
	40	};
	41
fb78140c GS	42	static LIST_HEAD(mon_priv_list);
fb78140c GS	43
31b58088	44	struct mon_private {
fb78140c	45	struct list_head priv_list;
31b58088 MH	46	struct list_head list;
	47	struct monwrite_hdr hdr;
	48	size_t hdr_to_read;
	49	size_t data_to_read;
	50	struct mon_buf *current_buf;
cbea66d9	51	struct mutex thread_mutex;
31b58088 MH	52	};
	53
	54	/*
	55	* helper functions
	56	*/
	57
	58	static int monwrite_diag(struct monwrite_hdr myhdr, char buffer, int fcn)
	59	{
	60	struct appldata_product_id id;
	61	int rc;
	62
	63	strcpy(id.prod_nr, "LNXAPPL");
	64	id.prod_fn = myhdr->applid;
	65	id.record_nr = myhdr->record_num;
	66	id.version_nr = myhdr->version;
	67	id.release_nr = myhdr->release;
	68	id.mod_lvl = myhdr->mod_level;
	69	rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen);
	70	if (rc <= 0)
	71	return rc;
1519c0c6	72	pr_err("Writing monitor data failed with rc=%i\n", rc);
31b58088 MH	73	if (rc == 5)
31b58088 MH	74	return -EPERM;
31b58088 MH	75	return -EINVAL;
	76	}
	77
4d284cac HC	78	static struct mon_buf monwrite_find_hdr(struct mon_private monpriv,
4d284cac HC	79	struct monwrite_hdr *monhdr)
31b58088 MH	80	{
	81	struct mon_buf entry, next;
	82
	83	list_for_each_entry_safe(entry, next, &monpriv->list, list)
2c91971f MH	84	if ((entry->hdr.mon_function == monhdr->mon_function \|\|
	85	monhdr->mon_function == MONWRITE_STOP_INTERVAL) &&
	86	entry->hdr.applid == monhdr->applid &&
31b58088 MH	87	entry->hdr.record_num == monhdr->record_num &&
	88	entry->hdr.version == monhdr->version &&
	89	entry->hdr.release == monhdr->release &&
	90	entry->hdr.mod_level == monhdr->mod_level)
	91	return entry;
2c91971f	92
31b58088 MH	93	return NULL;
	94	}
	95
	96	static int monwrite_new_hdr(struct mon_private *monpriv)
	97	{
	98	struct monwrite_hdr *monhdr = &monpriv->hdr;
	99	struct mon_buf *monbuf;
	100	int rc;
	101
	102	if (monhdr->datalen > MONWRITE_MAX_DATALEN \|\|
	103	monhdr->mon_function > MONWRITE_START_CONFIG \|\|
	104	monhdr->hdrlen != sizeof(struct monwrite_hdr))
	105	return -EINVAL;
2c91971f MH	106	monbuf = NULL;
	107	if (monhdr->mon_function != MONWRITE_GEN_EVENT)
	108	monbuf = monwrite_find_hdr(monpriv, monhdr);
31b58088 MH	109	if (monbuf) {
	110	if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) {
	111	monhdr->datalen = monbuf->hdr.datalen;
	112	rc = monwrite_diag(monhdr, monbuf->data,
	113	APPLDATA_STOP_REC);
	114	list_del(&monbuf->list);
2d103d5a	115	mon_buf_count--;
31b58088 MH	116	kfree(monbuf->data);
	117	kfree(monbuf);
	118	monbuf = NULL;
	119	}
2c91971f	120	} else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) {
2d103d5a	121	if (mon_buf_count >= mon_max_bufs)
31b58088 MH	122	return -ENOSPC;
	123	monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL);
	124	if (!monbuf)
	125	return -ENOMEM;
715d854b	126	monbuf->data = kzalloc(monhdr->datalen,
31b58088 MH	127	GFP_KERNEL \| GFP_DMA);
	128	if (!monbuf->data) {
	129	kfree(monbuf);
	130	return -ENOMEM;
	131	}
	132	monbuf->hdr = *monhdr;
	133	list_add_tail(&monbuf->list, &monpriv->list);
2c91971f MH	134	if (monhdr->mon_function != MONWRITE_GEN_EVENT)
2c91971f MH	135	mon_buf_count++;
31b58088 MH	136	}
	137	monpriv->current_buf = monbuf;
	138	return 0;
	139	}
	140
	141	static int monwrite_new_data(struct mon_private *monpriv)
	142	{
	143	struct monwrite_hdr *monhdr = &monpriv->hdr;
	144	struct mon_buf *monbuf = monpriv->current_buf;
	145	int rc = 0;
	146
	147	switch (monhdr->mon_function) {
	148	case MONWRITE_START_INTERVAL:
	149	if (!monbuf->diag_done) {
	150	rc = monwrite_diag(monhdr, monbuf->data,
	151	APPLDATA_START_INTERVAL_REC);
	152	monbuf->diag_done = 1;
	153	}
	154	break;
	155	case MONWRITE_START_CONFIG:
	156	if (!monbuf->diag_done) {
	157	rc = monwrite_diag(monhdr, monbuf->data,
	158	APPLDATA_START_CONFIG_REC);
	159	monbuf->diag_done = 1;
	160	}
	161	break;
	162	case MONWRITE_GEN_EVENT:
	163	rc = monwrite_diag(monhdr, monbuf->data,
	164	APPLDATA_GEN_EVENT_REC);
	165	list_del(&monpriv->current_buf->list);
	166	kfree(monpriv->current_buf->data);
	167	kfree(monpriv->current_buf);
	168	monpriv->current_buf = NULL;
	169	break;
	170	default:
	171	/* monhdr->mon_function is checked in monwrite_new_hdr */
	172	BUG();
	173	}
	174	return rc;
	175	}
	176
	177	/*
	178	* file operations
	179	*/
	180
	181	static int monwrite_open(struct inode inode, struct file filp)
	182	{
	183	struct mon_private *monpriv;
	184
	185	monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL);
	186	if (!monpriv)
	187	return -ENOMEM;
	188	INIT_LIST_HEAD(&monpriv->list);
	189	monpriv->hdr_to_read = sizeof(monpriv->hdr);
cbea66d9	190	mutex_init(&monpriv->thread_mutex);
31b58088	191	filp->private_data = monpriv;
fb78140c	192	list_add_tail(&monpriv->priv_list, &mon_priv_list);
31b58088 MH	193	return nonseekable_open(inode, filp);
	194	}
	195
	196	static int monwrite_close(struct inode inode, struct file filp)
	197	{
	198	struct mon_private *monpriv = filp->private_data;
	199	struct mon_buf entry, next;
	200
	201	list_for_each_entry_safe(entry, next, &monpriv->list, list) {
	202	if (entry->hdr.mon_function != MONWRITE_GEN_EVENT)
	203	monwrite_diag(&entry->hdr, entry->data,
	204	APPLDATA_STOP_REC);
2d103d5a	205	mon_buf_count--;
31b58088 MH	206	list_del(&entry->list);
	207	kfree(entry->data);
	208	kfree(entry);
	209	}
fb78140c	210	list_del(&monpriv->priv_list);
31b58088 MH	211	kfree(monpriv);
	212	return 0;
	213	}
	214
	215	static ssize_t monwrite_write(struct file filp, const char __user data,
	216	size_t count, loff_t *ppos)
	217	{
	218	struct mon_private *monpriv = filp->private_data;
	219	size_t len, written;
	220	void *to;
	221	int rc;
	222
cbea66d9	223	mutex_lock(&monpriv->thread_mutex);
31b58088 MH	224	for (written = 0; written < count; ) {
	225	if (monpriv->hdr_to_read) {
	226	len = min(count - written, monpriv->hdr_to_read);
	227	to = (char *) &monpriv->hdr +
	228	sizeof(monpriv->hdr) - monpriv->hdr_to_read;
	229	if (copy_from_user(to, data + written, len)) {
	230	rc = -EFAULT;
	231	goto out_error;
	232	}
	233	monpriv->hdr_to_read -= len;
	234	written += len;
	235	if (monpriv->hdr_to_read > 0)
	236	continue;
	237	rc = monwrite_new_hdr(monpriv);
	238	if (rc)
	239	goto out_error;
	240	monpriv->data_to_read = monpriv->current_buf ?
	241	monpriv->current_buf->hdr.datalen : 0;
	242	}
	243
	244	if (monpriv->data_to_read) {
	245	len = min(count - written, monpriv->data_to_read);
	246	to = monpriv->current_buf->data +
	247	monpriv->hdr.datalen - monpriv->data_to_read;
	248	if (copy_from_user(to, data + written, len)) {
	249	rc = -EFAULT;
	250	goto out_error;
	251	}
	252	monpriv->data_to_read -= len;
	253	written += len;
	254	if (monpriv->data_to_read > 0)
	255	continue;
	256	rc = monwrite_new_data(monpriv);
	257	if (rc)
	258	goto out_error;
	259	}
	260	monpriv->hdr_to_read = sizeof(monpriv->hdr);
	261	}
cbea66d9	262	mutex_unlock(&monpriv->thread_mutex);
31b58088 MH	263	return written;
	264
	265	out_error:
	266	monpriv->data_to_read = 0;
	267	monpriv->hdr_to_read = sizeof(struct monwrite_hdr);
cbea66d9	268	mutex_unlock(&monpriv->thread_mutex);
31b58088 MH	269	return rc;
	270	}
	271
d54b1fdb	272	static const struct file_operations monwrite_fops = {
31b58088 MH	273	.owner = THIS_MODULE,
	274	.open = &monwrite_open,
	275	.release = &monwrite_close,
	276	.write = &monwrite_write,
	277	};
	278
	279	static struct miscdevice mon_dev = {
	280	.name = "monwriter",
	281	.fops = &monwrite_fops,
	282	.minor = MISC_DYNAMIC_MINOR,
	283	};
	284
fb78140c GS	285	/*
	286	* suspend/resume
	287	*/
	288
	289	static int monwriter_freeze(struct device *dev)
	290	{
	291	struct mon_private *monpriv;
	292	struct mon_buf *monbuf;
	293
	294	list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
	295	list_for_each_entry(monbuf, &monpriv->list, list) {
	296	if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT)
	297	monwrite_diag(&monbuf->hdr, monbuf->data,
	298	APPLDATA_STOP_REC);
	299	}
	300	}
	301	return 0;
	302	}
	303
	304	static int monwriter_restore(struct device *dev)
	305	{
	306	struct mon_private *monpriv;
	307	struct mon_buf *monbuf;
	308
	309	list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
	310	list_for_each_entry(monbuf, &monpriv->list, list) {
	311	if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL)
	312	monwrite_diag(&monbuf->hdr, monbuf->data,
	313	APPLDATA_START_INTERVAL_REC);
	314	if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG)
	315	monwrite_diag(&monbuf->hdr, monbuf->data,
	316	APPLDATA_START_CONFIG_REC);
	317	}
	318	}
	319	return 0;
	320	}
	321
	322	static int monwriter_thaw(struct device *dev)
	323	{
	324	return monwriter_restore(dev);
	325	}
	326
47145210	327	static const struct dev_pm_ops monwriter_pm_ops = {
fb78140c GS	328	.freeze = monwriter_freeze,
	329	.thaw = monwriter_thaw,
	330	.restore = monwriter_restore,
	331	};
	332
	333	static struct platform_driver monwriter_pdrv = {
	334	.driver = {
	335	.name = "monwriter",
	336	.owner = THIS_MODULE,
	337	.pm = &monwriter_pm_ops,
	338	},
	339	};
	340
	341	static struct platform_device *monwriter_pdev;
	342
31b58088 MH	343	/*
	344	* module init/exit
	345	*/
	346
	347	static int __init mon_init(void)
	348	{
fb78140c GS	349	int rc;
	350
	351	if (!MACHINE_IS_VM)
31b58088	352	return -ENODEV;
fb78140c GS	353
	354	rc = platform_driver_register(&monwriter_pdrv);
	355	if (rc)
	356	return rc;
	357
	358	monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL,
	359	0);
	360	if (IS_ERR(monwriter_pdev)) {
	361	rc = PTR_ERR(monwriter_pdev);
	362	goto out_driver;
	363	}
	364
801f97b7 GS	365	/*
	366	* misc_register() has to be the last action in module_init(), because
	367	* file operations will be available right after this.
	368	*/
fb78140c GS	369	rc = misc_register(&mon_dev);
	370	if (rc)
	371	goto out_device;
	372	return 0;
	373
	374	out_device:
	375	platform_device_unregister(monwriter_pdev);
	376	out_driver:
	377	platform_driver_unregister(&monwriter_pdrv);
	378	return rc;
31b58088 MH	379	}
	380
	381	static void __exit mon_exit(void)
	382	{
	383	WARN_ON(misc_deregister(&mon_dev) != 0);
fb78140c GS	384	platform_device_unregister(monwriter_pdev);
fb78140c GS	385	platform_driver_unregister(&monwriter_pdrv);
31b58088 MH	386	}
	387
	388	module_init(mon_init);
	389	module_exit(mon_exit);
	390
	391	module_param_named(max_bufs, mon_max_bufs, int, 0644);
ceb3dfba	392	MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers "
31b58088 MH	393	"that can be active at one time");
	394
	395	MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>");
	396	MODULE_DESCRIPTION("Character device driver for writing z/VM "
	397	"APPLDATA monitor records.");
	398	MODULE_LICENSE("GPL");