[mirror_ubuntu-jammy-kernel.git] / drivers / s390 / char / monwriter.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 <linux/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;

	strncpy(id.prod_nr, "LNXAPPL", 7);
	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 = 0;

	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 rc;
}

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,
	.llseek  = noop_llseek,
};

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",
		.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)
{
	misc_deregister(&mon_dev);
	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
6f05e69e	1	// SPDX-License-Identifier: GPL-2.0
31b58088	2	/*
31b58088 MH	3	* Character device driver for writing z/VM *MONITOR service records.
31b58088 MH	4	*
fb78140c	5	* Copyright IBM Corp. 2006, 2009
31b58088 MH	6	*
	7	* Author(s): Melissa Howland <Melissa.Howland@us.ibm.com>
	8	*/
	9
1519c0c6 MH	10	#define KMSG_COMPONENT "monwriter"
	11	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	12
31b58088 MH	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/init.h>
	16	#include <linux/errno.h>
	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19	#include <linux/miscdevice.h>
	20	#include <linux/ctype.h>
	21	#include <linux/poll.h>
cbea66d9	22	#include <linux/mutex.h>
fb78140c	23	#include <linux/platform_device.h>
5a0e3ad6	24	#include <linux/slab.h>
7c0f6ba6	25	#include <linux/uaccess.h>
31b58088 MH	26	#include <asm/ebcdic.h>
	27	#include <asm/io.h>
	28	#include <asm/appldata.h>
	29	#include <asm/monwriter.h>
	30
524a237e	31	#define MONWRITE_MAX_DATALEN 4010
31b58088 MH	32
31b58088 MH	33	static int mon_max_bufs = 255;
2d103d5a	34	static int mon_buf_count;
31b58088 MH	35
	36	struct mon_buf {
	37	struct list_head list;
	38	struct monwrite_hdr hdr;
	39	int diag_done;
	40	char *data;
	41	};
	42
fb78140c GS	43	static LIST_HEAD(mon_priv_list);
fb78140c GS	44
31b58088	45	struct mon_private {
fb78140c	46	struct list_head priv_list;
31b58088 MH	47	struct list_head list;
	48	struct monwrite_hdr hdr;
	49	size_t hdr_to_read;
	50	size_t data_to_read;
	51	struct mon_buf *current_buf;
cbea66d9	52	struct mutex thread_mutex;
31b58088 MH	53	};
	54
	55	/*
	56	* helper functions
	57	*/
	58
	59	static int monwrite_diag(struct monwrite_hdr myhdr, char buffer, int fcn)
	60	{
	61	struct appldata_product_id id;
	62	int rc;
	63
3cf11d77	64	strncpy(id.prod_nr, "LNXAPPL", 7);
31b58088 MH	65	id.prod_fn = myhdr->applid;
	66	id.record_nr = myhdr->record_num;
	67	id.version_nr = myhdr->version;
	68	id.release_nr = myhdr->release;
	69	id.mod_lvl = myhdr->mod_level;
	70	rc = appldata_asm(&id, fcn, (void *) buffer, myhdr->datalen);
	71	if (rc <= 0)
	72	return rc;
1519c0c6	73	pr_err("Writing monitor data failed with rc=%i\n", rc);
31b58088 MH	74	if (rc == 5)
31b58088 MH	75	return -EPERM;
31b58088 MH	76	return -EINVAL;
	77	}
	78
4d284cac HC	79	static struct mon_buf monwrite_find_hdr(struct mon_private monpriv,
4d284cac HC	80	struct monwrite_hdr *monhdr)
31b58088 MH	81	{
	82	struct mon_buf entry, next;
	83
	84	list_for_each_entry_safe(entry, next, &monpriv->list, list)
2c91971f MH	85	if ((entry->hdr.mon_function == monhdr->mon_function \|\|
	86	monhdr->mon_function == MONWRITE_STOP_INTERVAL) &&
	87	entry->hdr.applid == monhdr->applid &&
31b58088 MH	88	entry->hdr.record_num == monhdr->record_num &&
	89	entry->hdr.version == monhdr->version &&
	90	entry->hdr.release == monhdr->release &&
	91	entry->hdr.mod_level == monhdr->mod_level)
	92	return entry;
2c91971f	93
31b58088 MH	94	return NULL;
	95	}
	96
	97	static int monwrite_new_hdr(struct mon_private *monpriv)
	98	{
	99	struct monwrite_hdr *monhdr = &monpriv->hdr;
	100	struct mon_buf *monbuf;
37fa9975	101	int rc = 0;
31b58088 MH	102
	103	if (monhdr->datalen > MONWRITE_MAX_DATALEN \|\|
	104	monhdr->mon_function > MONWRITE_START_CONFIG \|\|
	105	monhdr->hdrlen != sizeof(struct monwrite_hdr))
	106	return -EINVAL;
2c91971f MH	107	monbuf = NULL;
	108	if (monhdr->mon_function != MONWRITE_GEN_EVENT)
	109	monbuf = monwrite_find_hdr(monpriv, monhdr);
31b58088 MH	110	if (monbuf) {
	111	if (monhdr->mon_function == MONWRITE_STOP_INTERVAL) {
	112	monhdr->datalen = monbuf->hdr.datalen;
	113	rc = monwrite_diag(monhdr, monbuf->data,
	114	APPLDATA_STOP_REC);
	115	list_del(&monbuf->list);
2d103d5a	116	mon_buf_count--;
31b58088 MH	117	kfree(monbuf->data);
	118	kfree(monbuf);
	119	monbuf = NULL;
	120	}
2c91971f	121	} else if (monhdr->mon_function != MONWRITE_STOP_INTERVAL) {
2d103d5a	122	if (mon_buf_count >= mon_max_bufs)
31b58088 MH	123	return -ENOSPC;
	124	monbuf = kzalloc(sizeof(struct mon_buf), GFP_KERNEL);
	125	if (!monbuf)
	126	return -ENOMEM;
715d854b	127	monbuf->data = kzalloc(monhdr->datalen,
31b58088 MH	128	GFP_KERNEL \| GFP_DMA);
	129	if (!monbuf->data) {
	130	kfree(monbuf);
	131	return -ENOMEM;
	132	}
	133	monbuf->hdr = *monhdr;
	134	list_add_tail(&monbuf->list, &monpriv->list);
2c91971f MH	135	if (monhdr->mon_function != MONWRITE_GEN_EVENT)
2c91971f MH	136	mon_buf_count++;
31b58088 MH	137	}
31b58088 MH	138	monpriv->current_buf = monbuf;
37fa9975	139	return rc;
31b58088 MH	140	}
	141
	142	static int monwrite_new_data(struct mon_private *monpriv)
	143	{
	144	struct monwrite_hdr *monhdr = &monpriv->hdr;
	145	struct mon_buf *monbuf = monpriv->current_buf;
	146	int rc = 0;
	147
	148	switch (monhdr->mon_function) {
	149	case MONWRITE_START_INTERVAL:
	150	if (!monbuf->diag_done) {
	151	rc = monwrite_diag(monhdr, monbuf->data,
	152	APPLDATA_START_INTERVAL_REC);
	153	monbuf->diag_done = 1;
	154	}
	155	break;
	156	case MONWRITE_START_CONFIG:
	157	if (!monbuf->diag_done) {
	158	rc = monwrite_diag(monhdr, monbuf->data,
	159	APPLDATA_START_CONFIG_REC);
	160	monbuf->diag_done = 1;
	161	}
	162	break;
	163	case MONWRITE_GEN_EVENT:
	164	rc = monwrite_diag(monhdr, monbuf->data,
	165	APPLDATA_GEN_EVENT_REC);
	166	list_del(&monpriv->current_buf->list);
	167	kfree(monpriv->current_buf->data);
	168	kfree(monpriv->current_buf);
	169	monpriv->current_buf = NULL;
	170	break;
	171	default:
	172	/* monhdr->mon_function is checked in monwrite_new_hdr */
	173	BUG();
	174	}
	175	return rc;
	176	}
	177
	178	/*
	179	* file operations
	180	*/
	181
	182	static int monwrite_open(struct inode inode, struct file filp)
	183	{
	184	struct mon_private *monpriv;
	185
	186	monpriv = kzalloc(sizeof(struct mon_private), GFP_KERNEL);
	187	if (!monpriv)
	188	return -ENOMEM;
	189	INIT_LIST_HEAD(&monpriv->list);
	190	monpriv->hdr_to_read = sizeof(monpriv->hdr);
cbea66d9	191	mutex_init(&monpriv->thread_mutex);
31b58088	192	filp->private_data = monpriv;
fb78140c	193	list_add_tail(&monpriv->priv_list, &mon_priv_list);
31b58088 MH	194	return nonseekable_open(inode, filp);
	195	}
	196
	197	static int monwrite_close(struct inode inode, struct file filp)
	198	{
	199	struct mon_private *monpriv = filp->private_data;
	200	struct mon_buf entry, next;
	201
	202	list_for_each_entry_safe(entry, next, &monpriv->list, list) {
	203	if (entry->hdr.mon_function != MONWRITE_GEN_EVENT)
	204	monwrite_diag(&entry->hdr, entry->data,
	205	APPLDATA_STOP_REC);
2d103d5a	206	mon_buf_count--;
31b58088 MH	207	list_del(&entry->list);
	208	kfree(entry->data);
	209	kfree(entry);
	210	}
fb78140c	211	list_del(&monpriv->priv_list);
31b58088 MH	212	kfree(monpriv);
	213	return 0;
	214	}
	215
	216	static ssize_t monwrite_write(struct file filp, const char __user data,
	217	size_t count, loff_t *ppos)
	218	{
	219	struct mon_private *monpriv = filp->private_data;
	220	size_t len, written;
	221	void *to;
	222	int rc;
	223
cbea66d9	224	mutex_lock(&monpriv->thread_mutex);
31b58088 MH	225	for (written = 0; written < count; ) {
	226	if (monpriv->hdr_to_read) {
	227	len = min(count - written, monpriv->hdr_to_read);
	228	to = (char *) &monpriv->hdr +
	229	sizeof(monpriv->hdr) - monpriv->hdr_to_read;
	230	if (copy_from_user(to, data + written, len)) {
	231	rc = -EFAULT;
	232	goto out_error;
	233	}
	234	monpriv->hdr_to_read -= len;
	235	written += len;
	236	if (monpriv->hdr_to_read > 0)
	237	continue;
	238	rc = monwrite_new_hdr(monpriv);
	239	if (rc)
	240	goto out_error;
	241	monpriv->data_to_read = monpriv->current_buf ?
	242	monpriv->current_buf->hdr.datalen : 0;
	243	}
	244
	245	if (monpriv->data_to_read) {
	246	len = min(count - written, monpriv->data_to_read);
	247	to = monpriv->current_buf->data +
	248	monpriv->hdr.datalen - monpriv->data_to_read;
	249	if (copy_from_user(to, data + written, len)) {
	250	rc = -EFAULT;
	251	goto out_error;
	252	}
	253	monpriv->data_to_read -= len;
	254	written += len;
	255	if (monpriv->data_to_read > 0)
	256	continue;
	257	rc = monwrite_new_data(monpriv);
	258	if (rc)
	259	goto out_error;
	260	}
	261	monpriv->hdr_to_read = sizeof(monpriv->hdr);
	262	}
cbea66d9	263	mutex_unlock(&monpriv->thread_mutex);
31b58088 MH	264	return written;
	265
	266	out_error:
	267	monpriv->data_to_read = 0;
	268	monpriv->hdr_to_read = sizeof(struct monwrite_hdr);
cbea66d9	269	mutex_unlock(&monpriv->thread_mutex);
31b58088 MH	270	return rc;
	271	}
	272
d54b1fdb	273	static const struct file_operations monwrite_fops = {
31b58088 MH	274	.owner = THIS_MODULE,
	275	.open = &monwrite_open,
	276	.release = &monwrite_close,
	277	.write = &monwrite_write,
6038f373	278	.llseek = noop_llseek,
31b58088 MH	279	};
	280
	281	static struct miscdevice mon_dev = {
	282	.name = "monwriter",
	283	.fops = &monwrite_fops,
	284	.minor = MISC_DYNAMIC_MINOR,
	285	};
	286
fb78140c GS	287	/*
	288	* suspend/resume
	289	*/
	290
	291	static int monwriter_freeze(struct device *dev)
	292	{
	293	struct mon_private *monpriv;
	294	struct mon_buf *monbuf;
	295
	296	list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
	297	list_for_each_entry(monbuf, &monpriv->list, list) {
	298	if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT)
	299	monwrite_diag(&monbuf->hdr, monbuf->data,
	300	APPLDATA_STOP_REC);
	301	}
	302	}
	303	return 0;
	304	}
	305
	306	static int monwriter_restore(struct device *dev)
	307	{
	308	struct mon_private *monpriv;
	309	struct mon_buf *monbuf;
	310
	311	list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
	312	list_for_each_entry(monbuf, &monpriv->list, list) {
	313	if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL)
	314	monwrite_diag(&monbuf->hdr, monbuf->data,
	315	APPLDATA_START_INTERVAL_REC);
	316	if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG)
	317	monwrite_diag(&monbuf->hdr, monbuf->data,
	318	APPLDATA_START_CONFIG_REC);
	319	}
	320	}
	321	return 0;
	322	}
	323
	324	static int monwriter_thaw(struct device *dev)
	325	{
	326	return monwriter_restore(dev);
	327	}
	328
47145210	329	static const struct dev_pm_ops monwriter_pm_ops = {
fb78140c GS	330	.freeze = monwriter_freeze,
	331	.thaw = monwriter_thaw,
	332	.restore = monwriter_restore,
	333	};
	334
	335	static struct platform_driver monwriter_pdrv = {
	336	.driver = {
	337	.name = "monwriter",
fb78140c GS	338	.pm = &monwriter_pm_ops,
	339	},
	340	};
	341
	342	static struct platform_device *monwriter_pdev;
	343
31b58088 MH	344	/*
	345	* module init/exit
	346	*/
	347
	348	static int __init mon_init(void)
	349	{
fb78140c GS	350	int rc;
	351
	352	if (!MACHINE_IS_VM)
31b58088	353	return -ENODEV;
fb78140c GS	354
	355	rc = platform_driver_register(&monwriter_pdrv);
	356	if (rc)
	357	return rc;
	358
	359	monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL,
	360	0);
	361	if (IS_ERR(monwriter_pdev)) {
	362	rc = PTR_ERR(monwriter_pdev);
	363	goto out_driver;
	364	}
	365
801f97b7 GS	366	/*
	367	* misc_register() has to be the last action in module_init(), because
	368	* file operations will be available right after this.
	369	*/
fb78140c GS	370	rc = misc_register(&mon_dev);
	371	if (rc)
	372	goto out_device;
	373	return 0;
	374
	375	out_device:
	376	platform_device_unregister(monwriter_pdev);
	377	out_driver:
	378	platform_driver_unregister(&monwriter_pdrv);
	379	return rc;
31b58088 MH	380	}
	381
	382	static void __exit mon_exit(void)
	383	{
547415d5	384	misc_deregister(&mon_dev);
fb78140c GS	385	platform_device_unregister(monwriter_pdev);
fb78140c GS	386	platform_driver_unregister(&monwriter_pdrv);
31b58088 MH	387	}
	388
	389	module_init(mon_init);
	390	module_exit(mon_exit);
	391
	392	module_param_named(max_bufs, mon_max_bufs, int, 0644);
ceb3dfba	393	MODULE_PARM_DESC(max_bufs, "Maximum number of sample monitor data buffers "
31b58088 MH	394	"that can be active at one time");
	395
	396	MODULE_AUTHOR("Melissa Howland <Melissa.Howland@us.ibm.com>");
	397	MODULE_DESCRIPTION("Character device driver for writing z/VM "
	398	"APPLDATA monitor records.");
	399	MODULE_LICENSE("GPL");