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368 lines
9.5 KiB
368 lines
9.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Author(s)......: Holger Smolinski <[email protected]> |
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* Horst Hummel <[email protected]> |
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* Carsten Otte <[email protected]> |
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* Martin Schwidefsky <[email protected]> |
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* Bugreports.to..: <[email protected]> |
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* Copyright IBM Corp. 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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#define KMSG_COMPONENT "dasd" |
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#include <linux/ctype.h> |
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#include <linux/slab.h> |
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#include <linux/string.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 <linux/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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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->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->state) { |
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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: %u, %lu blocks, %lu 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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#ifdef CONFIG_DASD_PROFILE |
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static int dasd_stats_all_block_on(void) |
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{ |
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int i, rc; |
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struct dasd_device *device; |
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rc = 0; |
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for (i = 0; i < dasd_max_devindex; ++i) { |
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device = dasd_device_from_devindex(i); |
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if (IS_ERR(device)) |
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continue; |
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if (device->block) |
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rc = dasd_profile_on(&device->block->profile); |
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dasd_put_device(device); |
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if (rc) |
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return rc; |
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} |
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return 0; |
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} |
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static void dasd_stats_all_block_off(void) |
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{ |
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int i; |
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struct dasd_device *device; |
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for (i = 0; i < dasd_max_devindex; ++i) { |
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device = dasd_device_from_devindex(i); |
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if (IS_ERR(device)) |
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continue; |
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if (device->block) |
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dasd_profile_off(&device->block->profile); |
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dasd_put_device(device); |
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} |
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} |
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static void dasd_stats_all_block_reset(void) |
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{ |
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int i; |
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struct dasd_device *device; |
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for (i = 0; i < dasd_max_devindex; ++i) { |
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device = dasd_device_from_devindex(i); |
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if (IS_ERR(device)) |
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continue; |
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if (device->block) |
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dasd_profile_reset(&device->block->profile); |
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dasd_put_device(device); |
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} |
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} |
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static void dasd_statistics_array(struct seq_file *m, 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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seq_printf(m, "%7d ", array[i] / factor); |
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if (i == 15) |
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seq_putc(m, '\n'); |
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} |
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seq_putc(m, '\n'); |
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} |
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#endif /* CONFIG_DASD_PROFILE */ |
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static int dasd_stats_proc_show(struct seq_file *m, void *v) |
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{ |
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#ifdef CONFIG_DASD_PROFILE |
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struct dasd_profile_info *prof; |
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int factor; |
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spin_lock_bh(&dasd_global_profile.lock); |
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prof = dasd_global_profile.data; |
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if (!prof) { |
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spin_unlock_bh(&dasd_global_profile.lock); |
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seq_printf(m, "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 0; |
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} |
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/* prevent counter '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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seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); |
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seq_printf(m, "with %u sectors(512B each)\n", |
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prof->dasd_io_sects); |
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seq_printf(m, "Scale Factor is %d\n", factor); |
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seq_printf(m, |
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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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seq_printf(m, |
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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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seq_printf(m, "Histogram of sizes (512B secs)\n"); |
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dasd_statistics_array(m, prof->dasd_io_secs, factor); |
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seq_printf(m, "Histogram of I/O times (microseconds)\n"); |
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dasd_statistics_array(m, prof->dasd_io_times, factor); |
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seq_printf(m, "Histogram of I/O times per sector\n"); |
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dasd_statistics_array(m, prof->dasd_io_timps, factor); |
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seq_printf(m, "Histogram of I/O time till ssch\n"); |
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dasd_statistics_array(m, prof->dasd_io_time1, factor); |
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seq_printf(m, "Histogram of I/O time between ssch and irq\n"); |
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dasd_statistics_array(m, prof->dasd_io_time2, factor); |
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seq_printf(m, "Histogram of I/O time between ssch " |
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"and irq per sector\n"); |
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dasd_statistics_array(m, prof->dasd_io_time2ps, factor); |
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seq_printf(m, "Histogram of I/O time between irq and end\n"); |
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dasd_statistics_array(m, prof->dasd_io_time3, factor); |
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seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); |
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dasd_statistics_array(m, prof->dasd_io_nr_req, factor); |
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spin_unlock_bh(&dasd_global_profile.lock); |
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#else |
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seq_printf(m, "Statistics are not activated in this kernel\n"); |
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#endif |
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return 0; |
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} |
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static int dasd_stats_proc_open(struct inode *inode, struct file *file) |
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{ |
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return single_open(file, dasd_stats_proc_show, NULL); |
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} |
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static ssize_t dasd_stats_proc_write(struct file *file, |
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const char __user *user_buf, size_t user_len, loff_t *pos) |
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{ |
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#ifdef CONFIG_DASD_PROFILE |
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char *buffer, *str; |
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int rc; |
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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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/* check for valid verbs */ |
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str = skip_spaces(buffer); |
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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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str = skip_spaces(str + 4); |
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if (strcmp(str, "on") == 0) { |
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/* switch on statistics profiling */ |
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rc = dasd_stats_all_block_on(); |
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if (rc) { |
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dasd_stats_all_block_off(); |
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goto out_error; |
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} |
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rc = dasd_profile_on(&dasd_global_profile); |
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if (rc) { |
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dasd_stats_all_block_off(); |
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goto out_error; |
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} |
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dasd_profile_reset(&dasd_global_profile); |
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dasd_global_profile_level = DASD_PROFILE_ON; |
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pr_info("The statistics feature has been switched " |
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"on\n"); |
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} else if (strcmp(str, "off") == 0) { |
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/* switch off statistics profiling */ |
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dasd_global_profile_level = DASD_PROFILE_OFF; |
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dasd_profile_off(&dasd_global_profile); |
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dasd_stats_all_block_off(); |
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pr_info("The statistics feature has been switched " |
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"off\n"); |
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} else |
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goto out_parse_error; |
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} else if (strncmp(str, "reset", 5) == 0) { |
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/* reset the statistics */ |
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dasd_profile_reset(&dasd_global_profile); |
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dasd_stats_all_block_reset(); |
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pr_info("The statistics have been reset\n"); |
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} else |
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goto out_parse_error; |
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vfree(buffer); |
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return user_len; |
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out_parse_error: |
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rc = -EINVAL; |
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pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str); |
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out_error: |
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vfree(buffer); |
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return rc; |
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#else |
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pr_warn("/proc/dasd/statistics: is not activated in this kernel\n"); |
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return user_len; |
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#endif /* CONFIG_DASD_PROFILE */ |
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} |
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static const struct proc_ops dasd_stats_proc_ops = { |
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.proc_open = dasd_stats_proc_open, |
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.proc_read = seq_read, |
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.proc_lseek = seq_lseek, |
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.proc_release = single_release, |
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.proc_write = dasd_stats_proc_write, |
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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_devices_entry = proc_create_seq("devices", 0444, |
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dasd_proc_root_entry, |
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&dasd_devices_seq_ops); |
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if (!dasd_devices_entry) |
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goto out_nodevices; |
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dasd_statistics_entry = proc_create("statistics", |
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S_IFREG | S_IRUGO | S_IWUSR, |
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dasd_proc_root_entry, |
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&dasd_stats_proc_ops); |
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if (!dasd_statistics_entry) |
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goto out_nostatistics; |
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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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