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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2bf373b3e3
For a large number of I/O requests the values were shifted binary. The shift was not transparent for the user because the shift value was not displayed. To make this interface more human readable the values are shifted decimal and the scale factor is displayed. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
353 lines
9.7 KiB
C
353 lines
9.7 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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dasd_put_device(device);
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return 0;
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}
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/* Print device number. */
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seq_printf(m, "%s", dev_name(&device->cdev->dev));
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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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MAJOR(disk_devt(block->gdp)),
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MINOR(disk_devt(block->gdp)));
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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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.owner = THIS_MODULE,
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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 factor)
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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] / factor);
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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 factor;
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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 (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
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factor *= 10);
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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 %u sectors(512B each)\n",
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prof->dasd_io_sects);
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str += sprintf(str, "Scale Factor is %d\n", factor);
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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, factor);
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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, factor);
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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, factor);
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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, factor);
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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, factor);
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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, factor);
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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, factor);
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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, factor);
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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", NULL);
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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 = proc_create("devices",
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S_IFREG | S_IRUGO | S_IWUSR,
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dasd_proc_root_entry,
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&dasd_devices_file_ops);
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if (!dasd_devices_entry)
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goto out_nodevices;
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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", NULL);
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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", NULL);
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}
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