| /* |
| * File...........: linux/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> |
| * (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; |
| |
| static inline 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; |
| } |
| |
| 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 struct file_operations dasd_devices_file_ops = { |
| .open = dasd_devices_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| static inline 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; |
| } |
| |
| static inline 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; |
| } |
| |
| 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); |
| } |