| /* |
| * 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. |
| * |
| */ |
| |
| #define KMSG_COMPONENT "dasd" |
| |
| #include <linux/ctype.h> |
| #include <linux/slab.h> |
| #include <linux/string.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 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: %d, %lld blocks, %lld 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, |
| }; |
| |
| static int dasd_devices_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &dasd_devices_seq_ops); |
| } |
| |
| static const struct file_operations dasd_devices_file_ops = { |
| .owner = THIS_MODULE, |
| .open = dasd_devices_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| #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; |
| |
| /* check for active profiling */ |
| if (!dasd_global_profile_level) { |
| seq_printf(m, "Statistics are off - they might be " |
| "switched on using 'echo set on > " |
| "/proc/dasd/statistics'\n"); |
| return 0; |
| } |
| prof = &dasd_global_profile_data; |
| |
| /* 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); |
| #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; |
| } |
| dasd_global_profile_reset(); |
| 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 and reset statistics profiling */ |
| dasd_global_profile_level = DASD_PROFILE_OFF; |
| dasd_global_profile_reset(); |
| 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_global_profile_reset(); |
| dasd_stats_all_block_reset(); |
| pr_info("The statistics have been reset\n"); |
| } else |
| goto out_parse_error; |
| kfree(buffer); |
| return user_len; |
| out_parse_error: |
| rc = -EINVAL; |
| pr_warning("%s is not a supported value for /proc/dasd/statistics\n", |
| str); |
| out_error: |
| kfree(buffer); |
| return rc; |
| #else |
| pr_warning("/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("devices", |
| S_IFREG | S_IRUGO | S_IWUSR, |
| dasd_proc_root_entry, |
| &dasd_devices_file_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); |
| } |