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