[thirdparty/linux.git] / drivers / s390 / block / dasd_proc.c

/*
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *		    Horst Hummel <Horst.Hummel@de.ibm.com>
 *		    Carsten Otte <Cotte@de.ibm.com>
 *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * Coypright IBM Corp. 1999, 2002
 *
 * /proc interface for the dasd driver.
 *
 */

#define KMSG_COMPONENT "dasd"

#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>

#include <asm/debug.h>
#include <linux/uaccess.h>

/* This is ugly... */
#define PRINTK_HEADER "dasd_proc:"

#include "dasd_int.h"

static struct proc_dir_entry *dasd_proc_root_entry = NULL;
static struct proc_dir_entry *dasd_devices_entry = NULL;
static struct proc_dir_entry *dasd_statistics_entry = NULL;

static int
dasd_devices_show(struct seq_file *m, void *v)
{
	struct dasd_device *device;
	struct dasd_block *block;
	char *substr;

	device = dasd_device_from_devindex((unsigned long) v - 1);
	if (IS_ERR(device))
		return 0;
	if (device->block)
		block = device->block;
	else {
		dasd_put_device(device);
		return 0;
	}
	/* Print device number. */
	seq_printf(m, "%s", dev_name(&device->cdev->dev));
	/* Print discipline string. */
	if (device->discipline != NULL)
		seq_printf(m, "(%s)", device->discipline->name);
	else
		seq_printf(m, "(none)");
	/* Print kdev. */
	if (block->gdp)
		seq_printf(m, " at (%3d:%6d)",
			   MAJOR(disk_devt(block->gdp)),
			   MINOR(disk_devt(block->gdp)));
	else
		seq_printf(m, "  at (???:??????)");
	/* Print device name. */
	if (block->gdp)
		seq_printf(m, " is %-8s", block->gdp->disk_name);
	else
		seq_printf(m, " is ????????");
	/* Print devices features. */
	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
	seq_printf(m, "%4s: ", substr);
	/* Print device status information. */
	switch (device->state) {
	case DASD_STATE_NEW:
		seq_printf(m, "new");
		break;
	case DASD_STATE_KNOWN:
		seq_printf(m, "detected");
		break;
	case DASD_STATE_BASIC:
		seq_printf(m, "basic");
		break;
	case DASD_STATE_UNFMT:
		seq_printf(m, "unformatted");
		break;
	case DASD_STATE_READY:
	case DASD_STATE_ONLINE:
		seq_printf(m, "active ");
		if (dasd_check_blocksize(block->bp_block))
			seq_printf(m, "n/f	 ");
		else
			seq_printf(m,
				   "at blocksize: %d, %lld blocks, %lld MB",
				   block->bp_block, block->blocks,
				   ((block->bp_block >> 9) *
				    block->blocks) >> 11);
		break;
	default:
		seq_printf(m, "no stat");
		break;
	}
	dasd_put_device(device);
	if (dasd_probeonly)
		seq_printf(m, "(probeonly)");
	seq_printf(m, "\n");
	return 0;
}

static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
{
	if (*pos >= dasd_max_devindex)
		return NULL;
	return (void *)((unsigned long) *pos + 1);
}

static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return dasd_devices_start(m, pos);
}

static void dasd_devices_stop(struct seq_file *m, void *v)
{
}

static const struct seq_operations dasd_devices_seq_ops = {
	.start		= dasd_devices_start,
	.next		= dasd_devices_next,
	.stop		= dasd_devices_stop,
	.show		= dasd_devices_show,
};

static int dasd_devices_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &dasd_devices_seq_ops);
}

static const struct file_operations dasd_devices_file_ops = {
	.owner		= THIS_MODULE,
	.open		= dasd_devices_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

#ifdef CONFIG_DASD_PROFILE
static int dasd_stats_all_block_on(void)
{
	int i, rc;
	struct dasd_device *device;

	rc = 0;
	for (i = 0; i < dasd_max_devindex; ++i) {
		device = dasd_device_from_devindex(i);
		if (IS_ERR(device))
			continue;
		if (device->block)
			rc = dasd_profile_on(&device->block->profile);
		dasd_put_device(device);
		if (rc)
			return rc;
	}
	return 0;
}

static void dasd_stats_all_block_off(void)
{
	int i;
	struct dasd_device *device;

	for (i = 0; i < dasd_max_devindex; ++i) {
		device = dasd_device_from_devindex(i);
		if (IS_ERR(device))
			continue;
		if (device->block)
			dasd_profile_off(&device->block->profile);
		dasd_put_device(device);
	}
}

static void dasd_stats_all_block_reset(void)
{
	int i;
	struct dasd_device *device;

	for (i = 0; i < dasd_max_devindex; ++i) {
		device = dasd_device_from_devindex(i);
		if (IS_ERR(device))
			continue;
		if (device->block)
			dasd_profile_reset(&device->block->profile);
		dasd_put_device(device);
	}
}

static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
{
	int i;

	for (i = 0; i < 32; i++) {
		seq_printf(m, "%7d ", array[i] / factor);
		if (i == 15)
			seq_putc(m, '\n');
	}
	seq_putc(m, '\n');
}
#endif /* CONFIG_DASD_PROFILE */

static int dasd_stats_proc_show(struct seq_file *m, void *v)
{
#ifdef CONFIG_DASD_PROFILE
	struct dasd_profile_info *prof;
	int factor;

	spin_lock_bh(&dasd_global_profile.lock);
	prof = dasd_global_profile.data;
	if (!prof) {
		spin_unlock_bh(&dasd_global_profile.lock);
		seq_printf(m, "Statistics are off - they might be "
				    "switched on using 'echo set on > "
				    "/proc/dasd/statistics'\n");
		return 0;
	}

	/* prevent counter 'overflow' on output */
	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
	     factor *= 10);

	seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
	seq_printf(m, "with %u sectors(512B each)\n",
		       prof->dasd_io_sects);
	seq_printf(m, "Scale Factor is  %d\n", factor);
	seq_printf(m,
		       "   __<4	   ___8	   __16	   __32	   __64	   _128	"
		       "   _256	   _512	   __1k	   __2k	   __4k	   __8k	"
		       "   _16k	   _32k	   _64k	   128k\n");
	seq_printf(m,
		       "   _256	   _512	   __1M	   __2M	   __4M	   __8M	"
		       "   _16M	   _32M	   _64M	   128M	   256M	   512M	"
		       "   __1G	   __2G	   __4G " "   _>4G\n");

	seq_printf(m, "Histogram of sizes (512B secs)\n");
	dasd_statistics_array(m, prof->dasd_io_secs, factor);
	seq_printf(m, "Histogram of I/O times (microseconds)\n");
	dasd_statistics_array(m, prof->dasd_io_times, factor);
	seq_printf(m, "Histogram of I/O times per sector\n");
	dasd_statistics_array(m, prof->dasd_io_timps, factor);
	seq_printf(m, "Histogram of I/O time till ssch\n");
	dasd_statistics_array(m, prof->dasd_io_time1, factor);
	seq_printf(m, "Histogram of I/O time between ssch and irq\n");
	dasd_statistics_array(m, prof->dasd_io_time2, factor);
	seq_printf(m, "Histogram of I/O time between ssch "
			    "and irq per sector\n");
	dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
	seq_printf(m, "Histogram of I/O time between irq and end\n");
	dasd_statistics_array(m, prof->dasd_io_time3, factor);
	seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
	dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
	spin_unlock_bh(&dasd_global_profile.lock);
#else
	seq_printf(m, "Statistics are not activated in this kernel\n");
#endif
	return 0;
}

static int dasd_stats_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, dasd_stats_proc_show, NULL);
}

static ssize_t dasd_stats_proc_write(struct file *file,
		const char __user *user_buf, size_t user_len, loff_t *pos)
{
#ifdef CONFIG_DASD_PROFILE
	char *buffer, *str;
	int rc;

	if (user_len > 65536)
		user_len = 65536;
	buffer = dasd_get_user_string(user_buf, user_len);
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);

	/* check for valid verbs */
	str = skip_spaces(buffer);
	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
		/* 'set xxx' was given */
		str = skip_spaces(str + 4);
		if (strcmp(str, "on") == 0) {
			/* switch on statistics profiling */
			rc = dasd_stats_all_block_on();
			if (rc) {
				dasd_stats_all_block_off();
				goto out_error;
			}
			rc = dasd_profile_on(&dasd_global_profile);
			if (rc) {
				dasd_stats_all_block_off();
				goto out_error;
			}
			dasd_profile_reset(&dasd_global_profile);
			dasd_global_profile_level = DASD_PROFILE_ON;
			pr_info("The statistics feature has been switched "
				"on\n");
		} else if (strcmp(str, "off") == 0) {
			/* switch off statistics profiling */
			dasd_global_profile_level = DASD_PROFILE_OFF;
			dasd_profile_off(&dasd_global_profile);
			dasd_stats_all_block_off();
			pr_info("The statistics feature has been switched "
				"off\n");
		} else
			goto out_parse_error;
	} else if (strncmp(str, "reset", 5) == 0) {
		/* reset the statistics */
		dasd_profile_reset(&dasd_global_profile);
		dasd_stats_all_block_reset();
		pr_info("The statistics have been reset\n");
	} else
		goto out_parse_error;
	vfree(buffer);
	return user_len;
out_parse_error:
	rc = -EINVAL;
	pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
out_error:
	vfree(buffer);
	return rc;
#else
	pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
	return user_len;
#endif				/* CONFIG_DASD_PROFILE */
}

static const struct file_operations dasd_stats_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= dasd_stats_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= dasd_stats_proc_write,
};

/*
 * Create dasd proc-fs entries.
 * In case creation failed, cleanup and return -ENOENT.
 */
int
dasd_proc_init(void)
{
	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
	if (!dasd_proc_root_entry)
		goto out_nodasd;
	dasd_devices_entry = proc_create("devices",
					 S_IFREG | S_IRUGO | S_IWUSR,
					 dasd_proc_root_entry,
					 &dasd_devices_file_ops);
	if (!dasd_devices_entry)
		goto out_nodevices;
	dasd_statistics_entry = proc_create("statistics",
					    S_IFREG | S_IRUGO | S_IWUSR,
					    dasd_proc_root_entry,
					    &dasd_stats_proc_fops);
	if (!dasd_statistics_entry)
		goto out_nostatistics;
	return 0;

 out_nostatistics:
	remove_proc_entry("devices", dasd_proc_root_entry);
 out_nodevices:
	remove_proc_entry("dasd", NULL);
 out_nodasd:
	return -ENOENT;
}

void
dasd_proc_exit(void)
{
	remove_proc_entry("devices", dasd_proc_root_entry);
	remove_proc_entry("statistics", dasd_proc_root_entry);
	remove_proc_entry("dasd", NULL);
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
	3	* Horst Hummel <Horst.Hummel@de.ibm.com>
	4	* Carsten Otte <Cotte@de.ibm.com>
	5	* Martin Schwidefsky <schwidefsky@de.ibm.com>
	6	* Bugreports.to..: <Linux390@de.ibm.com>
a53c8fab	7	* Coypright IBM Corp. 1999, 2002
1da177e4 LT	8	*
	9	* /proc interface for the dasd driver.
	10	*
1da177e4 LT	11	*/
1da177e4 LT	12
fc19f381 SH	13	#define KMSG_COMPONENT "dasd"
fc19f381 SH	14
1da177e4	15	#include <linux/ctype.h>
5a0e3ad6	16	#include <linux/slab.h>
e7d2860b	17	#include <linux/string.h>
1da177e4 LT	18	#include <linux/seq_file.h>
1da177e4 LT	19	#include <linux/vmalloc.h>
66a464db	20	#include <linux/proc_fs.h>
1da177e4 LT	21
1da177e4 LT	22	#include <asm/debug.h>
7c0f6ba6	23	#include <linux/uaccess.h>
1da177e4 LT	24
	25	/* This is ugly... */
	26	#define PRINTK_HEADER "dasd_proc:"
	27
	28	#include "dasd_int.h"
	29
	30	static struct proc_dir_entry *dasd_proc_root_entry = NULL;
	31	static struct proc_dir_entry *dasd_devices_entry = NULL;
	32	static struct proc_dir_entry *dasd_statistics_entry = NULL;
	33
1da177e4 LT	34	static int
	35	dasd_devices_show(struct seq_file m, void v)
	36	{
	37	struct dasd_device *device;
8e09f215	38	struct dasd_block *block;
1da177e4 LT	39	char *substr;
	40
	41	device = dasd_device_from_devindex((unsigned long) v - 1);
	42	if (IS_ERR(device))
	43	return 0;
8e09f215 SW	44	if (device->block)
8e09f215 SW	45	block = device->block;
a5e23839 SW	46	else {
a5e23839 SW	47	dasd_put_device(device);
8e09f215	48	return 0;
a5e23839	49	}
1da177e4	50	/* Print device number. */
2a0217d5	51	seq_printf(m, "%s", dev_name(&device->cdev->dev));
1da177e4	52	/* Print discipline string. */
294001a8	53	if (device->discipline != NULL)
1da177e4 LT	54	seq_printf(m, "(%s)", device->discipline->name);
	55	else
	56	seq_printf(m, "(none)");
	57	/* Print kdev. */
8e09f215	58	if (block->gdp)
1da177e4	59	seq_printf(m, " at (%3d:%6d)",
f331c029 TH	60	MAJOR(disk_devt(block->gdp)),
f331c029 TH	61	MINOR(disk_devt(block->gdp)));
1da177e4 LT	62	else
	63	seq_printf(m, " at (???:??????)");
	64	/* Print device name. */
8e09f215 SW	65	if (block->gdp)
8e09f215 SW	66	seq_printf(m, " is %-8s", block->gdp->disk_name);
1da177e4 LT	67	else
	68	seq_printf(m, " is ????????");
	69	/* Print devices features. */
c6eb7b77	70	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
1da177e4 LT	71	seq_printf(m, "%4s: ", substr);
1da177e4 LT	72	/* Print device status information. */
294001a8	73	switch (device->state) {
1da177e4 LT	74	case DASD_STATE_NEW:
	75	seq_printf(m, "new");
	76	break;
	77	case DASD_STATE_KNOWN:
	78	seq_printf(m, "detected");
	79	break;
	80	case DASD_STATE_BASIC:
	81	seq_printf(m, "basic");
	82	break;
90f0094d	83	case DASD_STATE_UNFMT:
b707dbe6	84	seq_printf(m, "unformatted");
90f0094d	85	break;
1da177e4 LT	86	case DASD_STATE_READY:
	87	case DASD_STATE_ONLINE:
	88	seq_printf(m, "active ");
8e09f215	89	if (dasd_check_blocksize(block->bp_block))
1da177e4 LT	90	seq_printf(m, "n/f ");
	91	else
	92	seq_printf(m,
b44b0ab3	93	"at blocksize: %d, %lld blocks, %lld MB",
8e09f215 SW	94	block->bp_block, block->blocks,
	95	((block->bp_block >> 9) *
	96	block->blocks) >> 11);
1da177e4 LT	97	break;
	98	default:
	99	seq_printf(m, "no stat");
	100	break;
	101	}
	102	dasd_put_device(device);
	103	if (dasd_probeonly)
	104	seq_printf(m, "(probeonly)");
	105	seq_printf(m, "\n");
	106	return 0;
	107	}
	108
	109	static void dasd_devices_start(struct seq_file m, loff_t *pos)
	110	{
	111	if (*pos >= dasd_max_devindex)
	112	return NULL;
	113	return (void )((unsigned long) pos + 1);
	114	}
	115
	116	static void dasd_devices_next(struct seq_file m, void v, loff_t pos)
	117	{
	118	++*pos;
	119	return dasd_devices_start(m, pos);
	120	}
	121
	122	static void dasd_devices_stop(struct seq_file m, void v)
	123	{
	124	}
	125
5c81cdbe	126	static const struct seq_operations dasd_devices_seq_ops = {
1da177e4 LT	127	.start = dasd_devices_start,
	128	.next = dasd_devices_next,
	129	.stop = dasd_devices_stop,
	130	.show = dasd_devices_show,
	131	};
	132
	133	static int dasd_devices_open(struct inode inode, struct file file)
	134	{
	135	return seq_open(file, &dasd_devices_seq_ops);
	136	}
	137
d54b1fdb	138	static const struct file_operations dasd_devices_file_ops = {
8b594007	139	.owner = THIS_MODULE,
1da177e4 LT	140	.open = dasd_devices_open,
	141	.read = seq_read,
	142	.llseek = seq_lseek,
	143	.release = seq_release,
	144	};
	145
3d62149f	146	#ifdef CONFIG_DASD_PROFILE
4fa52aa7 SW	147	static int dasd_stats_all_block_on(void)
	148	{
	149	int i, rc;
	150	struct dasd_device *device;
	151
	152	rc = 0;
	153	for (i = 0; i < dasd_max_devindex; ++i) {
	154	device = dasd_device_from_devindex(i);
	155	if (IS_ERR(device))
	156	continue;
	157	if (device->block)
	158	rc = dasd_profile_on(&device->block->profile);
	159	dasd_put_device(device);
	160	if (rc)
	161	return rc;
	162	}
	163	return 0;
	164	}
	165
	166	static void dasd_stats_all_block_off(void)
	167	{
	168	int i;
	169	struct dasd_device *device;
	170
	171	for (i = 0; i < dasd_max_devindex; ++i) {
	172	device = dasd_device_from_devindex(i);
	173	if (IS_ERR(device))
	174	continue;
	175	if (device->block)
	176	dasd_profile_off(&device->block->profile);
	177	dasd_put_device(device);
	178	}
	179	}
	180
	181	static void dasd_stats_all_block_reset(void)
	182	{
	183	int i;
	184	struct dasd_device *device;
	185
	186	for (i = 0; i < dasd_max_devindex; ++i) {
	187	device = dasd_device_from_devindex(i);
	188	if (IS_ERR(device))
	189	continue;
	190	if (device->block)
	191	dasd_profile_reset(&device->block->profile);
	192	dasd_put_device(device);
	193	}
	194	}
	195
34b9243a	196	static void dasd_statistics_array(struct seq_file m, unsigned int array, int factor)
1da177e4 LT	197	{
	198	int i;
	199
	200	for (i = 0; i < 32; i++) {
34b9243a	201	seq_printf(m, "%7d ", array[i] / factor);
1da177e4	202	if (i == 15)
34b9243a	203	seq_putc(m, '\n');
1da177e4	204	}
34b9243a	205	seq_putc(m, '\n');
1da177e4	206	}
3d62149f	207	#endif /* CONFIG_DASD_PROFILE */
1da177e4	208
34b9243a	209	static int dasd_stats_proc_show(struct seq_file m, void v)
1da177e4	210	{
1da177e4	211	#ifdef CONFIG_DASD_PROFILE
4fa52aa7	212	struct dasd_profile_info *prof;
2bf373b3	213	int factor;
1da177e4	214
6765cc2a SO	215	spin_lock_bh(&dasd_global_profile.lock);
	216	prof = dasd_global_profile.data;
	217	if (!prof) {
	218	spin_unlock_bh(&dasd_global_profile.lock);
34b9243a	219	seq_printf(m, "Statistics are off - they might be "
1da177e4 LT	220	"switched on using 'echo set on > "
1da177e4 LT	221	"/proc/dasd/statistics'\n");
34b9243a	222	return 0;
1da177e4 LT	223	}
1da177e4 LT	224
fbfecd37	225	/* prevent counter 'overflow' on output */
2bf373b3 SH	226	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
2bf373b3 SH	227	factor *= 10);
1da177e4	228
34b9243a AD	229	seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
34b9243a AD	230	seq_printf(m, "with %u sectors(512B each)\n",
1da177e4	231	prof->dasd_io_sects);
34b9243a AD	232	seq_printf(m, "Scale Factor is %d\n", factor);
34b9243a AD	233	seq_printf(m,
1da177e4 LT	234	" __<4 ___8 __16 __32 __64 _128 "
	235	" _256 _512 __1k __2k __4k __8k "
	236	" _16k _32k _64k 128k\n");
34b9243a	237	seq_printf(m,
1da177e4 LT	238	" _256 _512 __1M __2M __4M __8M "
	239	" _16M _32M _64M 128M 256M 512M "
	240	" __1G __2G __4G " " _>4G\n");
	241
34b9243a AD	242	seq_printf(m, "Histogram of sizes (512B secs)\n");
	243	dasd_statistics_array(m, prof->dasd_io_secs, factor);
	244	seq_printf(m, "Histogram of I/O times (microseconds)\n");
	245	dasd_statistics_array(m, prof->dasd_io_times, factor);
	246	seq_printf(m, "Histogram of I/O times per sector\n");
	247	dasd_statistics_array(m, prof->dasd_io_timps, factor);
	248	seq_printf(m, "Histogram of I/O time till ssch\n");
	249	dasd_statistics_array(m, prof->dasd_io_time1, factor);
	250	seq_printf(m, "Histogram of I/O time between ssch and irq\n");
	251	dasd_statistics_array(m, prof->dasd_io_time2, factor);
	252	seq_printf(m, "Histogram of I/O time between ssch "
1da177e4	253	"and irq per sector\n");
34b9243a AD	254	dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
	255	seq_printf(m, "Histogram of I/O time between irq and end\n");
	256	dasd_statistics_array(m, prof->dasd_io_time3, factor);
	257	seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
	258	dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
8ea55c95	259	spin_unlock_bh(&dasd_global_profile.lock);
1da177e4	260	#else
34b9243a	261	seq_printf(m, "Statistics are not activated in this kernel\n");
1da177e4	262	#endif
34b9243a	263	return 0;
1da177e4 LT	264	}
1da177e4 LT	265
34b9243a AD	266	static int dasd_stats_proc_open(struct inode inode, struct file file)
	267	{
	268	return single_open(file, dasd_stats_proc_show, NULL);
	269	}
	270
	271	static ssize_t dasd_stats_proc_write(struct file *file,
	272	const char __user user_buf, size_t user_len, loff_t pos)
1da177e4 LT	273	{
	274	#ifdef CONFIG_DASD_PROFILE
	275	char buffer, str;
4fa52aa7	276	int rc;
1da177e4 LT	277
	278	if (user_len > 65536)
	279	user_len = 65536;
	280	buffer = dasd_get_user_string(user_buf, user_len);
	281	if (IS_ERR(buffer))
	282	return PTR_ERR(buffer);
1da177e4 LT	283
1da177e4 LT	284	/* check for valid verbs */
e7d2860b	285	str = skip_spaces(buffer);
1da177e4 LT	286	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
1da177e4 LT	287	/* 'set xxx' was given */
e7d2860b	288	str = skip_spaces(str + 4);
1da177e4 LT	289	if (strcmp(str, "on") == 0) {
1da177e4 LT	290	/* switch on statistics profiling */
4fa52aa7 SW	291	rc = dasd_stats_all_block_on();
	292	if (rc) {
	293	dasd_stats_all_block_off();
	294	goto out_error;
	295	}
6765cc2a SO	296	rc = dasd_profile_on(&dasd_global_profile);
	297	if (rc) {
	298	dasd_stats_all_block_off();
	299	goto out_error;
	300	}
	301	dasd_profile_reset(&dasd_global_profile);
4fa52aa7	302	dasd_global_profile_level = DASD_PROFILE_ON;
fc19f381 SH	303	pr_info("The statistics feature has been switched "
fc19f381 SH	304	"on\n");
1da177e4	305	} else if (strcmp(str, "off") == 0) {
6765cc2a	306	/* switch off statistics profiling */
4fa52aa7	307	dasd_global_profile_level = DASD_PROFILE_OFF;
6765cc2a	308	dasd_profile_off(&dasd_global_profile);
4fa52aa7	309	dasd_stats_all_block_off();
fc19f381 SH	310	pr_info("The statistics feature has been switched "
fc19f381 SH	311	"off\n");
1da177e4	312	} else
4fa52aa7	313	goto out_parse_error;
1da177e4 LT	314	} else if (strncmp(str, "reset", 5) == 0) {
1da177e4 LT	315	/* reset the statistics */
6765cc2a	316	dasd_profile_reset(&dasd_global_profile);
4fa52aa7	317	dasd_stats_all_block_reset();
fc19f381	318	pr_info("The statistics have been reset\n");
1da177e4	319	} else
4fa52aa7	320	goto out_parse_error;
e4258d55	321	vfree(buffer);
1da177e4	322	return user_len;
4fa52aa7 SW	323	out_parse_error:
4fa52aa7 SW	324	rc = -EINVAL;
baebc70a	325	pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
4fa52aa7	326	out_error:
e4258d55	327	vfree(buffer);
4fa52aa7	328	return rc;
1da177e4	329	#else
baebc70a	330	pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
1da177e4 LT	331	return user_len;
	332	#endif /* CONFIG_DASD_PROFILE */
	333	}
	334
34b9243a AD	335	static const struct file_operations dasd_stats_proc_fops = {
	336	.owner = THIS_MODULE,
	337	.open = dasd_stats_proc_open,
	338	.read = seq_read,
	339	.llseek = seq_lseek,
	340	.release = single_release,
	341	.write = dasd_stats_proc_write,
	342	};
	343
7220fe8b HH	344	/*
	345	* Create dasd proc-fs entries.
	346	* In case creation failed, cleanup and return -ENOENT.
	347	*/
1da177e4 LT	348	int
	349	dasd_proc_init(void)
	350	{
c74c120a	351	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
7220fe8b HH	352	if (!dasd_proc_root_entry)
7220fe8b HH	353	goto out_nodasd;
8b594007 DL	354	dasd_devices_entry = proc_create("devices",
	355	S_IFREG \| S_IRUGO \| S_IWUSR,
	356	dasd_proc_root_entry,
	357	&dasd_devices_file_ops);
7220fe8b HH	358	if (!dasd_devices_entry)
7220fe8b HH	359	goto out_nodevices;
34b9243a AD	360	dasd_statistics_entry = proc_create("statistics",
	361	S_IFREG \| S_IRUGO \| S_IWUSR,
	362	dasd_proc_root_entry,
	363	&dasd_stats_proc_fops);
7220fe8b HH	364	if (!dasd_statistics_entry)
7220fe8b HH	365	goto out_nostatistics;
1da177e4	366	return 0;
7220fe8b HH	367
	368	out_nostatistics:
	369	remove_proc_entry("devices", dasd_proc_root_entry);
	370	out_nodevices:
c74c120a	371	remove_proc_entry("dasd", NULL);
7220fe8b HH	372	out_nodasd:
7220fe8b HH	373	return -ENOENT;
1da177e4 LT	374	}
	375
	376	void
	377	dasd_proc_exit(void)
	378	{
	379	remove_proc_entry("devices", dasd_proc_root_entry);
	380	remove_proc_entry("statistics", dasd_proc_root_entry);
c74c120a	381	remove_proc_entry("dasd", NULL);
1da177e4	382	}