Release 4.7 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 <asm/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;
}

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martin schwidefsky
martin schwidefsky
267
72.75%
7
41.18%
stefan weinhuber
stefan weinhuber
39
10.63%
3
17.65%
andrew morton
andrew morton
28
7.63%
1
5.88%
horst hummel
horst hummel
17
4.63%
4
23.53%
tejun heo
tejun heo
12
3.27%
1
5.88%
kay sievers
kay sievers
4
1.09%
1
5.88%
Total
367
100.00%
17
100.00%



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);
}

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

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martin schwidefsky
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32
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static void dasd_devices_stop(struct seq_file *m, void *v)
{
}

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martin schwidefsky
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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);
}

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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;
}

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stefan weinhuber
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85
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1
100.00%



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);
	}
}

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stefan weinhuber
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67
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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);
	}
}

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67
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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');
}
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martin schwidefsky
martin schwidefsky
54
76.06%
1
25.00%
alexey dobriyan
alexey dobriyan
13
18.31%
1
25.00%
stefan haberland
stefan haberland
3
4.23%
1
25.00%
heiko carstens
heiko carstens
1
1.41%
1
25.00%
Total
71
100.00%
4
100.00%

#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;
}

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martin schwidefsky
201
65.69%
3
33.33%
alexey dobriyan
alexey dobriyan
47
15.36%
1
11.11%
sebastian ott
sebastian ott
31
10.13%
2
22.22%
stefan haberland
stefan haberland
24
7.84%
1
11.11%
stefan weinhuber
stefan weinhuber
2
0.65%
1
11.11%
uwe kleine-koenig
uwe kleine-koenig
1
0.33%
1
11.11%
Total
306
100.00%
9
100.00%



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

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alexey dobriyan
20
76.92%
1
33.33%
martin schwidefsky
martin schwidefsky
6
23.08%
2
66.67%
Total
26
100.00%
3
100.00%



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 */
}

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martin schwidefsky
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stefan weinhuber
44
14.92%
2
18.18%
sebastian ott
sebastian ott
35
11.86%
1
9.09%
heiko carstens
heiko carstens
13
4.41%
1
9.09%
stefan haberland
stefan haberland
11
3.73%
1
9.09%
andre goddard rosa
andre goddard rosa
6
2.03%
1
9.09%
alexey dobriyan
alexey dobriyan
5
1.69%
1
9.09%
joe perches
joe perches
2
0.68%
1
9.09%
andrew morton
andrew morton
1
0.34%
1
9.09%
Total
295
100.00%
11
100.00%


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;
}

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horst hummel
47
45.63%
1
20.00%
martin schwidefsky
martin schwidefsky
46
44.66%
1
20.00%
alexey dobriyan
alexey dobriyan
6
5.83%
2
40.00%
denis v. lunev
denis v. lunev
4
3.88%
1
20.00%
Total
103
100.00%
5
100.00%


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);
}
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martin schwidefsky
martin schwidefsky
27
96.43%
1
50.00%
alexey dobriyan
alexey dobriyan
1
3.57%
1
50.00%
Total
28
100.00%
2
100.00%

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martin schwidefsky
martin schwidefsky
993
58.58%
8
20.00%
stefan weinhuber
stefan weinhuber
304
17.94%
5
12.50%
alexey dobriyan
alexey dobriyan
130
7.67%
2
5.00%
sebastian ott
sebastian ott
66
3.89%
2
5.00%
horst hummel
horst hummel
65
3.83%
5
12.50%
stefan haberland
stefan haberland
42
2.48%
2
5.00%
andrew morton
andrew morton
29
1.71%
2
5.00%
heiko carstens
heiko carstens
21
1.24%
4
10.00%
tejun heo
tejun heo
15
0.88%
2
5.00%
andre goddard rosa
andre goddard rosa
9
0.53%
1
2.50%
denis v. lunev
denis v. lunev
9
0.53%
1
2.50%
kay sievers
kay sievers
4
0.24%
1
2.50%
michael holzheu
michael holzheu
3
0.18%
1
2.50%
joe perches
joe perches
2
0.12%
1
2.50%
uwe kleine-koenig
uwe kleine-koenig
1
0.06%
1
2.50%
arjan van de ven
arjan van de ven
1
0.06%
1
2.50%
jan engelhardt
jan engelhardt
1
0.06%
1
2.50%
Total
1695
100.00%
40
100.00%
  
Directory: drivers/s390/block

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