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