// SPDX-License-Identifier: GPL-2.0 /* * Author(s)......: Holger Smolinski * Horst Hummel * Carsten Otte * Martin Schwidefsky * Bugreports.to..: * Coypright IBM Corp. 1999, 2002 * * /proc interface for the dasd driver. * */ #define KMSG_COMPONENT "dasd" #include #include #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 int dasd_devices_show(struct seq_file *m, void *v) { struct dasd_device *device; struct dasd_block *block; char *substr; device = dasd_device_from_devindex((unsigned long) v - 1); if (IS_ERR(device)) return 0; if (device->block) block = device->block; else { dasd_put_device(device); return 0; } /* Print device number. */ seq_printf(m, "%s", dev_name(&device->cdev->dev)); /* Print discipline string. */ if (device->discipline != NULL) seq_printf(m, "(%s)", device->discipline->name); else seq_printf(m, "(none)"); /* Print kdev. */ if (block->gdp) seq_printf(m, " at (%3d:%6d)", MAJOR(disk_devt(block->gdp)), MINOR(disk_devt(block->gdp))); else seq_printf(m, " at (???:??????)"); /* Print device name. */ if (block->gdp) seq_printf(m, " is %-8s", block->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->state) { 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(block->bp_block)) seq_printf(m, "n/f "); else seq_printf(m, "at blocksize: %u, %lu blocks, %lu MB", block->bp_block, block->blocks, ((block->bp_block >> 9) * block->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 const struct seq_operations dasd_devices_seq_ops = { .start = dasd_devices_start, .next = dasd_devices_next, .stop = dasd_devices_stop, .show = dasd_devices_show, }; #ifdef CONFIG_DASD_PROFILE static int dasd_stats_all_block_on(void) { int i, rc; struct dasd_device *device; rc = 0; for (i = 0; i < dasd_max_devindex; ++i) { device = dasd_device_from_devindex(i); if (IS_ERR(device)) continue; if (device->block) rc = dasd_profile_on(&device->block->profile); dasd_put_device(device); if (rc) return rc; } return 0; } static void dasd_stats_all_block_off(void) { int i; struct dasd_device *device; for (i = 0; i < dasd_max_devindex; ++i) { device = dasd_device_from_devindex(i); if (IS_ERR(device)) continue; if (device->block) dasd_profile_off(&device->block->profile); dasd_put_device(device); } } static void dasd_stats_all_block_reset(void) { int i; struct dasd_device *device; for (i = 0; i < dasd_max_devindex; ++i) { device = dasd_device_from_devindex(i); if (IS_ERR(device)) continue; if (device->block) dasd_profile_reset(&device->block->profile); dasd_put_device(device); } } static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor) { int i; for (i = 0; i < 32; i++) { seq_printf(m, "%7d ", array[i] / factor); if (i == 15) seq_putc(m, '\n'); } seq_putc(m, '\n'); } #endif /* CONFIG_DASD_PROFILE */ static int dasd_stats_proc_show(struct seq_file *m, void *v) { #ifdef CONFIG_DASD_PROFILE struct dasd_profile_info *prof; int factor; spin_lock_bh(&dasd_global_profile.lock); prof = dasd_global_profile.data; if (!prof) { spin_unlock_bh(&dasd_global_profile.lock); seq_printf(m, "Statistics are off - they might be " "switched on using 'echo set on > " "/proc/dasd/statistics'\n"); return 0; } /* prevent counter 'overflow' on output */ for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; factor *= 10); seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); seq_printf(m, "with %u sectors(512B each)\n", prof->dasd_io_sects); seq_printf(m, "Scale Factor is %d\n", factor); seq_printf(m, " __<4 ___8 __16 __32 __64 _128 " " _256 _512 __1k __2k __4k __8k " " _16k _32k _64k 128k\n"); seq_printf(m, " _256 _512 __1M __2M __4M __8M " " _16M _32M _64M 128M 256M 512M " " __1G __2G __4G " " _>4G\n"); seq_printf(m, "Histogram of sizes (512B secs)\n"); dasd_statistics_array(m, prof->dasd_io_secs, factor); seq_printf(m, "Histogram of I/O times (microseconds)\n"); dasd_statistics_array(m, prof->dasd_io_times, factor); seq_printf(m, "Histogram of I/O times per sector\n"); dasd_statistics_array(m, prof->dasd_io_timps, factor); seq_printf(m, "Histogram of I/O time till ssch\n"); dasd_statistics_array(m, prof->dasd_io_time1, factor); seq_printf(m, "Histogram of I/O time between ssch and irq\n"); dasd_statistics_array(m, prof->dasd_io_time2, factor); seq_printf(m, "Histogram of I/O time between ssch " "and irq per sector\n"); dasd_statistics_array(m, prof->dasd_io_time2ps, factor); seq_printf(m, "Histogram of I/O time between irq and end\n"); dasd_statistics_array(m, prof->dasd_io_time3, factor); seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); dasd_statistics_array(m, prof->dasd_io_nr_req, factor); spin_unlock_bh(&dasd_global_profile.lock); #else seq_printf(m, "Statistics are not activated in this kernel\n"); #endif return 0; } static int dasd_stats_proc_open(struct inode *inode, struct file *file) { return single_open(file, dasd_stats_proc_show, NULL); } static ssize_t dasd_stats_proc_write(struct file *file, const char __user *user_buf, size_t user_len, loff_t *pos) { #ifdef CONFIG_DASD_PROFILE char *buffer, *str; int rc; if (user_len > 65536) user_len = 65536; buffer = dasd_get_user_string(user_buf, user_len); if (IS_ERR(buffer)) return PTR_ERR(buffer); /* check for valid verbs */ str = skip_spaces(buffer); if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { /* 'set xxx' was given */ str = skip_spaces(str + 4); if (strcmp(str, "on") == 0) { /* switch on statistics profiling */ rc = dasd_stats_all_block_on(); if (rc) { dasd_stats_all_block_off(); goto out_error; } rc = dasd_profile_on(&dasd_global_profile); if (rc) { dasd_stats_all_block_off(); goto out_error; } dasd_profile_reset(&dasd_global_profile); dasd_global_profile_level = DASD_PROFILE_ON; pr_info("The statistics feature has been switched " "on\n"); } else if (strcmp(str, "off") == 0) { /* switch off statistics profiling */ dasd_global_profile_level = DASD_PROFILE_OFF; dasd_profile_off(&dasd_global_profile); dasd_stats_all_block_off(); pr_info("The statistics feature has been switched " "off\n"); } else goto out_parse_error; } else if (strncmp(str, "reset", 5) == 0) { /* reset the statistics */ dasd_profile_reset(&dasd_global_profile); dasd_stats_all_block_reset(); pr_info("The statistics have been reset\n"); } else goto out_parse_error; vfree(buffer); return user_len; out_parse_error: rc = -EINVAL; pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str); out_error: vfree(buffer); return rc; #else pr_warn("/proc/dasd/statistics: is not activated in this kernel\n"); return user_len; #endif /* CONFIG_DASD_PROFILE */ } static const struct file_operations dasd_stats_proc_fops = { .owner = THIS_MODULE, .open = dasd_stats_proc_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, .write = dasd_stats_proc_write, }; /* * 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", NULL); if (!dasd_proc_root_entry) goto out_nodasd; dasd_devices_entry = proc_create_seq("devices", 0444, dasd_proc_root_entry, &dasd_devices_seq_ops); if (!dasd_devices_entry) goto out_nodevices; dasd_statistics_entry = proc_create("statistics", S_IFREG | S_IRUGO | S_IWUSR, dasd_proc_root_entry, &dasd_stats_proc_fops); if (!dasd_statistics_entry) goto out_nostatistics; return 0; out_nostatistics: remove_proc_entry("devices", dasd_proc_root_entry); out_nodevices: remove_proc_entry("dasd", NULL); 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", NULL); }