drivers/s390/block/dasd_proc.c - kernel/common - Git at Google

 /*
  * File...........: linux/drivers/s390/block/dasd_proc.c
  * Author(s)......: Holger Smolinski <[email protected]>
  *		    Horst Hummel <[email protected]>
  *		    Carsten Otte <[email protected]>
  *		    Martin Schwidefsky <[email protected]>
  * Bugreports.to..: <[email protected]>
  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
  *
  * /proc interface for the dasd driver.
  *
  */

 #include <linux/ctype.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;

 #ifdef CONFIG_DASD_PROFILE
 static char *
 dasd_get_user_string(const char __user *user_buf, size_t user_len)
 {
 	char *buffer;

 	buffer = kmalloc(user_len + 1, GFP_KERNEL);
 	if (buffer == NULL)
 		return ERR_PTR(-ENOMEM);
 	if (copy_from_user(buffer, user_buf, user_len) != 0) {
 		kfree(buffer);
 		return ERR_PTR(-EFAULT);
 	}
 	/* got the string, now strip linefeed. */
 	if (buffer[user_len - 1] == '\n')
 		buffer[user_len - 1] = 0;
 	else
 		buffer[user_len] = 0;
 	return buffer;
 }
 #endif /* CONFIG_DASD_PROFILE */

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

 	device = dasd_device_from_devindex((unsigned long) v - 1);
 	if (IS_ERR(device))
 		return 0;
 	/* Print device number. */
 	seq_printf(m, "%s", device->cdev->dev.bus_id);
 	/* Print discipline string. */
 	if (device != NULL && device->discipline != NULL)
 		seq_printf(m, "(%s)", device->discipline->name);
 	else
 		seq_printf(m, "(none)");
 	/* Print kdev. */
 	if (device->gdp)
 		seq_printf(m, " at (%3d:%6d)",
 			   device->gdp->major, device->gdp->first_minor);
 	else
 		seq_printf(m, "  at (???:??????)");
 	/* Print device name. */
 	if (device->gdp)
 		seq_printf(m, " is %-8s", device->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 != NULL) ? device->state : -1) {
 	case -1:
 		seq_printf(m, "unknown");
 		break;
 	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(device->bp_block))
 			seq_printf(m, "n/f	 ");
 		else
 			seq_printf(m,
 				   "at blocksize: %d, %ld blocks, %ld MB",
 				   device->bp_block, device->blocks,
 				   ((device->bp_block >> 9) *
 				    device->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 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 = {
 	.open		= dasd_devices_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };

 static int
 dasd_calc_metrics(char *page, char **start, off_t off,
 		  int count, int *eof, int len)
 {
 	len = (len > off) ? len - off : 0;
 	if (len > count)
 		len = count;
 	if (len < count)
 		*eof = 1;
 	*start = page + off;
 	return len;
 }

 #ifdef CONFIG_DASD_PROFILE
 static char *
 dasd_statistics_array(char *str, unsigned int *array, int shift)
 {
 	int i;

 	for (i = 0; i < 32; i++) {
 		str += sprintf(str, "%7d ", array[i] >> shift);
 		if (i == 15)
 			str += sprintf(str, "\n");
 	}
 	str += sprintf(str,"\n");
 	return str;
 }
 #endif /* CONFIG_DASD_PROFILE */

 static int
 dasd_statistics_read(char *page, char **start, off_t off,
 		     int count, int *eof, void *data)
 {
 	unsigned long len;
 #ifdef CONFIG_DASD_PROFILE
 	struct dasd_profile_info_t *prof;
 	char *str;
 	int shift;

 	/* check for active profiling */
 	if (dasd_profile_level == DASD_PROFILE_OFF) {
 		len = sprintf(page, "Statistics are off - they might be "
 				    "switched on using 'echo set on > "
 				    "/proc/dasd/statistics'\n");
 		return dasd_calc_metrics(page, start, off, count, eof, len);
 	}

 	prof = &dasd_global_profile;
 	/* prevent couter 'overflow' on output */
 	for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);

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

 	str += sprintf(str, "Histogram of sizes (512B secs)\n");
 	str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
 	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
 	str = dasd_statistics_array(str, prof->dasd_io_times, shift);
 	str += sprintf(str, "Histogram of I/O times per sector\n");
 	str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
 	str += sprintf(str, "Histogram of I/O time till ssch\n");
 	str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
 	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
 	str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
 	str += sprintf(str, "Histogram of I/O time between ssch "
 			    "and irq per sector\n");
 	str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
 	str += sprintf(str, "Histogram of I/O time between irq and end\n");
 	str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
 	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
 	str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
 	len = str - page;
 #else
 	len = sprintf(page, "Statistics are not activated in this kernel\n");
 #endif
 	return dasd_calc_metrics(page, start, off, count, eof, len);
 }

 static int
 dasd_statistics_write(struct file *file, const char __user *user_buf,
 		      unsigned long user_len, void *data)
 {
 #ifdef CONFIG_DASD_PROFILE
 	char *buffer, *str;

 	if (user_len > 65536)
 		user_len = 65536;
 	buffer = dasd_get_user_string(user_buf, user_len);
 	if (IS_ERR(buffer))
 		return PTR_ERR(buffer);
 	MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);

 	/* check for valid verbs */
 	for (str = buffer; isspace(*str); str++);
 	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 		/* 'set xxx' was given */
 		for (str = str + 4; isspace(*str); str++);
 		if (strcmp(str, "on") == 0) {
 			/* switch on statistics profiling */
 			dasd_profile_level = DASD_PROFILE_ON;
 			MESSAGE(KERN_INFO, "%s", "Statistics switched on");
 		} else if (strcmp(str, "off") == 0) {
 			/* switch off and reset statistics profiling */
 			memset(&dasd_global_profile,
 			       0, sizeof (struct dasd_profile_info_t));
 			dasd_profile_level = DASD_PROFILE_OFF;
 			MESSAGE(KERN_INFO, "%s", "Statistics switched off");
 		} else
 			goto out_error;
 	} else if (strncmp(str, "reset", 5) == 0) {
 		/* reset the statistics */
 		memset(&dasd_global_profile, 0,
 		       sizeof (struct dasd_profile_info_t));
 		MESSAGE(KERN_INFO, "%s", "Statistics reset");
 	} else
 		goto out_error;
 	kfree(buffer);
 	return user_len;
 out_error:
 	MESSAGE(KERN_WARNING, "%s",
 		"/proc/dasd/statistics: only 'set on', 'set off' "
 		"and 'reset' are supported verbs");
 	kfree(buffer);
 	return -EINVAL;
 #else
 	MESSAGE(KERN_WARNING, "%s",
 		"/proc/dasd/statistics: is not activated in this kernel");
 	return user_len;
 #endif				/* CONFIG_DASD_PROFILE */
 }

 /*
  * 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", &proc_root);
 	if (!dasd_proc_root_entry)
 		goto out_nodasd;
 	dasd_proc_root_entry->owner = THIS_MODULE;
 	dasd_devices_entry = create_proc_entry("devices",
 					       S_IFREG | S_IRUGO | S_IWUSR,
 					       dasd_proc_root_entry);
 	if (!dasd_devices_entry)
 		goto out_nodevices;
 	dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 	dasd_devices_entry->owner = THIS_MODULE;
 	dasd_statistics_entry = create_proc_entry("statistics",
 						  S_IFREG | S_IRUGO | S_IWUSR,
 						  dasd_proc_root_entry);
 	if (!dasd_statistics_entry)
 		goto out_nostatistics;
 	dasd_statistics_entry->read_proc = dasd_statistics_read;
 	dasd_statistics_entry->write_proc = dasd_statistics_write;
 	dasd_statistics_entry->owner = THIS_MODULE;
 	return 0;

  out_nostatistics:
 	remove_proc_entry("devices", dasd_proc_root_entry);
  out_nodevices:
 	remove_proc_entry("dasd", &proc_root);
  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", &proc_root);
 }
	/*
	* File...........: linux/drivers/s390/block/dasd_proc.c
	* Author(s)......: Holger Smolinski <[email protected]>
	* Horst Hummel <[email protected]>
	* Carsten Otte <[email protected]>
	* Martin Schwidefsky <[email protected]>
	* Bugreports.to..: <[email protected]>
	* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
	*
	* /proc interface for the dasd driver.
	*
	*/

	#include <linux/ctype.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;

	#ifdef CONFIG_DASD_PROFILE
	static char *
	dasd_get_user_string(const char __user *user_buf, size_t user_len)
	{
	char *buffer;

	buffer = kmalloc(user_len + 1, GFP_KERNEL);
	if (buffer == NULL)
	return ERR_PTR(-ENOMEM);
	if (copy_from_user(buffer, user_buf, user_len) != 0) {
	kfree(buffer);
	return ERR_PTR(-EFAULT);
	}
	/* got the string, now strip linefeed. */
	if (buffer[user_len - 1] == '\n')
	buffer[user_len - 1] = 0;
	else
	buffer[user_len] = 0;
	return buffer;
	}
	#endif /* CONFIG_DASD_PROFILE */

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

	device = dasd_device_from_devindex((unsigned long) v - 1);
	if (IS_ERR(device))
	return 0;
	/* Print device number. */
	seq_printf(m, "%s", device->cdev->dev.bus_id);
	/* Print discipline string. */
	if (device != NULL && device->discipline != NULL)
	seq_printf(m, "(%s)", device->discipline->name);
	else
	seq_printf(m, "(none)");
	/* Print kdev. */
	if (device->gdp)
	seq_printf(m, " at (%3d:%6d)",
	device->gdp->major, device->gdp->first_minor);
	else
	seq_printf(m, " at (???:??????)");
	/* Print device name. */
	if (device->gdp)
	seq_printf(m, " is %-8s", device->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 != NULL) ? device->state : -1) {
	case -1:
	seq_printf(m, "unknown");
	break;
	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(device->bp_block))
	seq_printf(m, "n/f ");
	else
	seq_printf(m,
	"at blocksize: %d, %ld blocks, %ld MB",
	device->bp_block, device->blocks,
	((device->bp_block >> 9) *
	device->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 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 = {
	.open = dasd_devices_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
	};

	static int
	dasd_calc_metrics(char page, char *start, off_t off,
	int count, int *eof, int len)
	{
	len = (len > off) ? len - off : 0;
	if (len > count)
	len = count;
	if (len < count)
	*eof = 1;
	*start = page + off;
	return len;
	}

	#ifdef CONFIG_DASD_PROFILE
	static char *
	dasd_statistics_array(char str, unsigned int array, int shift)
	{
	int i;

	for (i = 0; i < 32; i++) {
	str += sprintf(str, "%7d ", array[i] >> shift);
	if (i == 15)
	str += sprintf(str, "\n");
	}
	str += sprintf(str,"\n");
	return str;
	}
	#endif /* CONFIG_DASD_PROFILE */

	static int
	dasd_statistics_read(char page, char *start, off_t off,
	int count, int eof, void data)
	{
	unsigned long len;
	#ifdef CONFIG_DASD_PROFILE
	struct dasd_profile_info_t *prof;
	char *str;
	int shift;

	/* check for active profiling */
	if (dasd_profile_level == DASD_PROFILE_OFF) {
	len = sprintf(page, "Statistics are off - they might be "
	"switched on using 'echo set on > "
	"/proc/dasd/statistics'\n");
	return dasd_calc_metrics(page, start, off, count, eof, len);
	}

	prof = &dasd_global_profile;
	/* prevent couter 'overflow' on output */
	for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);

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

	str += sprintf(str, "Histogram of sizes (512B secs)\n");
	str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
	str = dasd_statistics_array(str, prof->dasd_io_times, shift);
	str += sprintf(str, "Histogram of I/O times per sector\n");
	str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
	str += sprintf(str, "Histogram of I/O time till ssch\n");
	str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
	str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
	str += sprintf(str, "Histogram of I/O time between ssch "
	"and irq per sector\n");
	str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
	str += sprintf(str, "Histogram of I/O time between irq and end\n");
	str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
	str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
	len = str - page;
	#else
	len = sprintf(page, "Statistics are not activated in this kernel\n");
	#endif
	return dasd_calc_metrics(page, start, off, count, eof, len);
	}

	static int
	dasd_statistics_write(struct file file, const char __user user_buf,
	unsigned long user_len, void *data)
	{
	#ifdef CONFIG_DASD_PROFILE
	char buffer, str;

	if (user_len > 65536)
	user_len = 65536;
	buffer = dasd_get_user_string(user_buf, user_len);
	if (IS_ERR(buffer))
	return PTR_ERR(buffer);
	MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);

	/* check for valid verbs */
	for (str = buffer; isspace(*str); str++);
	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
	/* 'set xxx' was given */
	for (str = str + 4; isspace(*str); str++);
	if (strcmp(str, "on") == 0) {
	/* switch on statistics profiling */
	dasd_profile_level = DASD_PROFILE_ON;
	MESSAGE(KERN_INFO, "%s", "Statistics switched on");
	} else if (strcmp(str, "off") == 0) {
	/* switch off and reset statistics profiling */
	memset(&dasd_global_profile,
	0, sizeof (struct dasd_profile_info_t));
	dasd_profile_level = DASD_PROFILE_OFF;
	MESSAGE(KERN_INFO, "%s", "Statistics switched off");
	} else
	goto out_error;
	} else if (strncmp(str, "reset", 5) == 0) {
	/* reset the statistics */
	memset(&dasd_global_profile, 0,
	sizeof (struct dasd_profile_info_t));
	MESSAGE(KERN_INFO, "%s", "Statistics reset");
	} else
	goto out_error;
	kfree(buffer);
	return user_len;
	out_error:
	MESSAGE(KERN_WARNING, "%s",
	"/proc/dasd/statistics: only 'set on', 'set off' "
	"and 'reset' are supported verbs");
	kfree(buffer);
	return -EINVAL;
	#else
	MESSAGE(KERN_WARNING, "%s",
	"/proc/dasd/statistics: is not activated in this kernel");
	return user_len;
	#endif /* CONFIG_DASD_PROFILE */
	}

	/*
	* 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", &proc_root);
	if (!dasd_proc_root_entry)
	goto out_nodasd;
	dasd_proc_root_entry->owner = THIS_MODULE;
	dasd_devices_entry = create_proc_entry("devices",
	S_IFREG \| S_IRUGO \| S_IWUSR,
	dasd_proc_root_entry);
	if (!dasd_devices_entry)
	goto out_nodevices;
	dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
	dasd_devices_entry->owner = THIS_MODULE;
	dasd_statistics_entry = create_proc_entry("statistics",
	S_IFREG \| S_IRUGO \| S_IWUSR,
	dasd_proc_root_entry);
	if (!dasd_statistics_entry)
	goto out_nostatistics;
	dasd_statistics_entry->read_proc = dasd_statistics_read;
	dasd_statistics_entry->write_proc = dasd_statistics_write;
	dasd_statistics_entry->owner = THIS_MODULE;
	return 0;

	out_nostatistics:
	remove_proc_entry("devices", dasd_proc_root_entry);
	out_nodevices:
	remove_proc_entry("dasd", &proc_root);
	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", &proc_root);
	}