![Jan Engelhardt](/assets/img/avatar_default.png)
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
348 lines
9.6 KiB
C
348 lines
9.6 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd_proc.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Horst Hummel <Horst.Hummel@de.ibm.com>
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* Carsten Otte <Cotte@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
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*
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* /proc interface for the dasd driver.
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*
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*/
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#include <linux/ctype.h>
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#include <linux/seq_file.h>
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#include <linux/vmalloc.h>
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#include <linux/proc_fs.h>
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#include <asm/debug.h>
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#include <asm/uaccess.h>
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/* This is ugly... */
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#define PRINTK_HEADER "dasd_proc:"
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#include "dasd_int.h"
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static struct proc_dir_entry *dasd_proc_root_entry = NULL;
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static struct proc_dir_entry *dasd_devices_entry = NULL;
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static struct proc_dir_entry *dasd_statistics_entry = NULL;
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#ifdef CONFIG_DASD_PROFILE
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static char *
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dasd_get_user_string(const char __user *user_buf, size_t user_len)
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{
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char *buffer;
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buffer = kmalloc(user_len + 1, GFP_KERNEL);
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if (buffer == NULL)
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return ERR_PTR(-ENOMEM);
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if (copy_from_user(buffer, user_buf, user_len) != 0) {
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kfree(buffer);
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return ERR_PTR(-EFAULT);
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}
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/* got the string, now strip linefeed. */
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if (buffer[user_len - 1] == '\n')
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buffer[user_len - 1] = 0;
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else
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buffer[user_len] = 0;
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return buffer;
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}
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#endif /* CONFIG_DASD_PROFILE */
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static int
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dasd_devices_show(struct seq_file *m, void *v)
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{
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struct dasd_device *device;
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struct dasd_block *block;
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char *substr;
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device = dasd_device_from_devindex((unsigned long) v - 1);
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if (IS_ERR(device))
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return 0;
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if (device->block)
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block = device->block;
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else
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return 0;
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/* Print device number. */
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seq_printf(m, "%s", device->cdev->dev.bus_id);
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/* Print discipline string. */
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if (device != NULL && device->discipline != NULL)
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seq_printf(m, "(%s)", device->discipline->name);
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else
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seq_printf(m, "(none)");
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/* Print kdev. */
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if (block->gdp)
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seq_printf(m, " at (%3d:%6d)",
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block->gdp->major, block->gdp->first_minor);
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else
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seq_printf(m, " at (???:??????)");
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/* Print device name. */
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if (block->gdp)
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seq_printf(m, " is %-8s", block->gdp->disk_name);
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else
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seq_printf(m, " is ????????");
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/* Print devices features. */
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substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
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seq_printf(m, "%4s: ", substr);
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/* Print device status information. */
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switch ((device != NULL) ? device->state : -1) {
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case -1:
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seq_printf(m, "unknown");
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break;
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case DASD_STATE_NEW:
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seq_printf(m, "new");
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break;
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case DASD_STATE_KNOWN:
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seq_printf(m, "detected");
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break;
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case DASD_STATE_BASIC:
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seq_printf(m, "basic");
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break;
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case DASD_STATE_UNFMT:
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seq_printf(m, "unformatted");
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break;
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case DASD_STATE_READY:
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case DASD_STATE_ONLINE:
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seq_printf(m, "active ");
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if (dasd_check_blocksize(block->bp_block))
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seq_printf(m, "n/f ");
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else
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seq_printf(m,
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"at blocksize: %d, %ld blocks, %ld MB",
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block->bp_block, block->blocks,
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((block->bp_block >> 9) *
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block->blocks) >> 11);
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break;
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default:
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seq_printf(m, "no stat");
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break;
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}
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dasd_put_device(device);
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if (dasd_probeonly)
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seq_printf(m, "(probeonly)");
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seq_printf(m, "\n");
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return 0;
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}
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static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
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{
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if (*pos >= dasd_max_devindex)
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return NULL;
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return (void *)((unsigned long) *pos + 1);
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}
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static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return dasd_devices_start(m, pos);
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}
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static void dasd_devices_stop(struct seq_file *m, void *v)
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{
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}
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static const struct seq_operations dasd_devices_seq_ops = {
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.start = dasd_devices_start,
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.next = dasd_devices_next,
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.stop = dasd_devices_stop,
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.show = dasd_devices_show,
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};
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static int dasd_devices_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &dasd_devices_seq_ops);
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}
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static const struct file_operations dasd_devices_file_ops = {
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.open = dasd_devices_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int
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dasd_calc_metrics(char *page, char **start, off_t off,
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int count, int *eof, int len)
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{
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len = (len > off) ? len - off : 0;
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if (len > count)
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len = count;
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if (len < count)
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*eof = 1;
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*start = page + off;
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return len;
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}
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#ifdef CONFIG_DASD_PROFILE
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static char *
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dasd_statistics_array(char *str, unsigned int *array, int shift)
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{
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int i;
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for (i = 0; i < 32; i++) {
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str += sprintf(str, "%7d ", array[i] >> shift);
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if (i == 15)
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str += sprintf(str, "\n");
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}
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str += sprintf(str,"\n");
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return str;
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}
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#endif /* CONFIG_DASD_PROFILE */
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static int
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dasd_statistics_read(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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unsigned long len;
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#ifdef CONFIG_DASD_PROFILE
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struct dasd_profile_info_t *prof;
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char *str;
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int shift;
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/* check for active profiling */
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if (dasd_profile_level == DASD_PROFILE_OFF) {
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len = sprintf(page, "Statistics are off - they might be "
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"switched on using 'echo set on > "
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"/proc/dasd/statistics'\n");
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return dasd_calc_metrics(page, start, off, count, eof, len);
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}
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prof = &dasd_global_profile;
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/* prevent couter 'overflow' on output */
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for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
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str = page;
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str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
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str += sprintf(str, "with %d sectors(512B each)\n",
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prof->dasd_io_sects);
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str += sprintf(str,
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" __<4 ___8 __16 __32 __64 _128 "
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" _256 _512 __1k __2k __4k __8k "
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" _16k _32k _64k 128k\n");
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str += sprintf(str,
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" _256 _512 __1M __2M __4M __8M "
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" _16M _32M _64M 128M 256M 512M "
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" __1G __2G __4G " " _>4G\n");
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str += sprintf(str, "Histogram of sizes (512B secs)\n");
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str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
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str += sprintf(str, "Histogram of I/O times (microseconds)\n");
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str = dasd_statistics_array(str, prof->dasd_io_times, shift);
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str += sprintf(str, "Histogram of I/O times per sector\n");
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str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
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str += sprintf(str, "Histogram of I/O time till ssch\n");
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str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
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str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
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str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
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str += sprintf(str, "Histogram of I/O time between ssch "
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"and irq per sector\n");
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str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
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str += sprintf(str, "Histogram of I/O time between irq and end\n");
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str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
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str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
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str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
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len = str - page;
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#else
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len = sprintf(page, "Statistics are not activated in this kernel\n");
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#endif
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return dasd_calc_metrics(page, start, off, count, eof, len);
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}
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static int
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dasd_statistics_write(struct file *file, const char __user *user_buf,
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unsigned long user_len, void *data)
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{
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#ifdef CONFIG_DASD_PROFILE
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char *buffer, *str;
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if (user_len > 65536)
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user_len = 65536;
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buffer = dasd_get_user_string(user_buf, user_len);
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if (IS_ERR(buffer))
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return PTR_ERR(buffer);
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MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
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/* check for valid verbs */
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for (str = buffer; isspace(*str); str++);
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if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
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/* 'set xxx' was given */
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for (str = str + 4; isspace(*str); str++);
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if (strcmp(str, "on") == 0) {
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/* switch on statistics profiling */
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dasd_profile_level = DASD_PROFILE_ON;
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MESSAGE(KERN_INFO, "%s", "Statistics switched on");
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} else if (strcmp(str, "off") == 0) {
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/* switch off and reset statistics profiling */
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memset(&dasd_global_profile,
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0, sizeof (struct dasd_profile_info_t));
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dasd_profile_level = DASD_PROFILE_OFF;
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MESSAGE(KERN_INFO, "%s", "Statistics switched off");
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} else
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goto out_error;
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} else if (strncmp(str, "reset", 5) == 0) {
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/* reset the statistics */
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memset(&dasd_global_profile, 0,
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sizeof (struct dasd_profile_info_t));
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MESSAGE(KERN_INFO, "%s", "Statistics reset");
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} else
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goto out_error;
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kfree(buffer);
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return user_len;
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out_error:
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MESSAGE(KERN_WARNING, "%s",
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"/proc/dasd/statistics: only 'set on', 'set off' "
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"and 'reset' are supported verbs");
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kfree(buffer);
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return -EINVAL;
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#else
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MESSAGE(KERN_WARNING, "%s",
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"/proc/dasd/statistics: is not activated in this kernel");
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return user_len;
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#endif /* CONFIG_DASD_PROFILE */
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}
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/*
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* Create dasd proc-fs entries.
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* In case creation failed, cleanup and return -ENOENT.
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*/
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int
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dasd_proc_init(void)
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{
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dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
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if (!dasd_proc_root_entry)
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goto out_nodasd;
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dasd_proc_root_entry->owner = THIS_MODULE;
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dasd_devices_entry = create_proc_entry("devices",
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S_IFREG | S_IRUGO | S_IWUSR,
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dasd_proc_root_entry);
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if (!dasd_devices_entry)
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goto out_nodevices;
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dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
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dasd_devices_entry->owner = THIS_MODULE;
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dasd_statistics_entry = create_proc_entry("statistics",
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S_IFREG | S_IRUGO | S_IWUSR,
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dasd_proc_root_entry);
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if (!dasd_statistics_entry)
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goto out_nostatistics;
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dasd_statistics_entry->read_proc = dasd_statistics_read;
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dasd_statistics_entry->write_proc = dasd_statistics_write;
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dasd_statistics_entry->owner = THIS_MODULE;
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return 0;
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out_nostatistics:
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remove_proc_entry("devices", dasd_proc_root_entry);
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out_nodevices:
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remove_proc_entry("dasd", &proc_root);
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out_nodasd:
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return -ENOENT;
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}
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void
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dasd_proc_exit(void)
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{
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remove_proc_entry("devices", dasd_proc_root_entry);
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remove_proc_entry("statistics", dasd_proc_root_entry);
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remove_proc_entry("dasd", &proc_root);
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}
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