Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File...........: linux/drivers/s390/block/dasd_proc.c |
| 3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| 4 | * Horst Hummel <Horst.Hummel@de.ibm.com> |
| 5 | * Carsten Otte <Cotte@de.ibm.com> |
| 6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 7 | * Bugreports.to..: <Linux390@de.ibm.com> |
| 8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002 |
| 9 | * |
| 10 | * /proc interface for the dasd driver. |
| 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 14 | #define KMSG_COMPONENT "dasd" |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/ctype.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 18 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/seq_file.h> |
| 20 | #include <linux/vmalloc.h> |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 21 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <asm/debug.h> |
| 24 | #include <asm/uaccess.h> |
| 25 | |
| 26 | /* This is ugly... */ |
| 27 | #define PRINTK_HEADER "dasd_proc:" |
| 28 | |
| 29 | #include "dasd_int.h" |
| 30 | |
| 31 | static struct proc_dir_entry *dasd_proc_root_entry = NULL; |
| 32 | static struct proc_dir_entry *dasd_devices_entry = NULL; |
| 33 | static struct proc_dir_entry *dasd_statistics_entry = NULL; |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | static int |
| 36 | dasd_devices_show(struct seq_file *m, void *v) |
| 37 | { |
| 38 | struct dasd_device *device; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 39 | struct dasd_block *block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | char *substr; |
| 41 | |
| 42 | device = dasd_device_from_devindex((unsigned long) v - 1); |
| 43 | if (IS_ERR(device)) |
| 44 | return 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 45 | if (device->block) |
| 46 | block = device->block; |
Stefan Weinhuber | a5e2383 | 2008-03-05 12:37:11 +0100 | [diff] [blame] | 47 | else { |
| 48 | dasd_put_device(device); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 49 | return 0; |
Stefan Weinhuber | a5e2383 | 2008-03-05 12:37:11 +0100 | [diff] [blame] | 50 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* Print device number. */ |
Kay Sievers | 2a0217d | 2008-10-10 21:33:09 +0200 | [diff] [blame] | 52 | seq_printf(m, "%s", dev_name(&device->cdev->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | /* Print discipline string. */ |
Stefan Haberland | 294001a | 2010-01-27 10:12:35 +0100 | [diff] [blame] | 54 | if (device->discipline != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | seq_printf(m, "(%s)", device->discipline->name); |
| 56 | else |
| 57 | seq_printf(m, "(none)"); |
| 58 | /* Print kdev. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 59 | if (block->gdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | seq_printf(m, " at (%3d:%6d)", |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 61 | MAJOR(disk_devt(block->gdp)), |
| 62 | MINOR(disk_devt(block->gdp))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | else |
| 64 | seq_printf(m, " at (???:??????)"); |
| 65 | /* Print device name. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 66 | if (block->gdp) |
| 67 | seq_printf(m, " is %-8s", block->gdp->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | else |
| 69 | seq_printf(m, " is ????????"); |
| 70 | /* Print devices features. */ |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 71 | substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | seq_printf(m, "%4s: ", substr); |
| 73 | /* Print device status information. */ |
Stefan Haberland | 294001a | 2010-01-27 10:12:35 +0100 | [diff] [blame] | 74 | switch (device->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | case DASD_STATE_NEW: |
| 76 | seq_printf(m, "new"); |
| 77 | break; |
| 78 | case DASD_STATE_KNOWN: |
| 79 | seq_printf(m, "detected"); |
| 80 | break; |
| 81 | case DASD_STATE_BASIC: |
| 82 | seq_printf(m, "basic"); |
| 83 | break; |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 84 | case DASD_STATE_UNFMT: |
Horst Hummel | b707dbe | 2006-03-09 17:33:52 -0800 | [diff] [blame] | 85 | seq_printf(m, "unformatted"); |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 86 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | case DASD_STATE_READY: |
| 88 | case DASD_STATE_ONLINE: |
| 89 | seq_printf(m, "active "); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 90 | if (dasd_check_blocksize(block->bp_block)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | seq_printf(m, "n/f "); |
| 92 | else |
| 93 | seq_printf(m, |
Stefan Weinhuber | b44b0ab3 | 2009-03-26 15:23:47 +0100 | [diff] [blame] | 94 | "at blocksize: %d, %lld blocks, %lld MB", |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 95 | block->bp_block, block->blocks, |
| 96 | ((block->bp_block >> 9) * |
| 97 | block->blocks) >> 11); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | break; |
| 99 | default: |
| 100 | seq_printf(m, "no stat"); |
| 101 | break; |
| 102 | } |
| 103 | dasd_put_device(device); |
| 104 | if (dasd_probeonly) |
| 105 | seq_printf(m, "(probeonly)"); |
| 106 | seq_printf(m, "\n"); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static void *dasd_devices_start(struct seq_file *m, loff_t *pos) |
| 111 | { |
| 112 | if (*pos >= dasd_max_devindex) |
| 113 | return NULL; |
| 114 | return (void *)((unsigned long) *pos + 1); |
| 115 | } |
| 116 | |
| 117 | static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) |
| 118 | { |
| 119 | ++*pos; |
| 120 | return dasd_devices_start(m, pos); |
| 121 | } |
| 122 | |
| 123 | static void dasd_devices_stop(struct seq_file *m, void *v) |
| 124 | { |
| 125 | } |
| 126 | |
Jan Engelhardt | 5c81cdb | 2008-01-26 14:11:29 +0100 | [diff] [blame] | 127 | static const struct seq_operations dasd_devices_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | .start = dasd_devices_start, |
| 129 | .next = dasd_devices_next, |
| 130 | .stop = dasd_devices_stop, |
| 131 | .show = dasd_devices_show, |
| 132 | }; |
| 133 | |
| 134 | static int dasd_devices_open(struct inode *inode, struct file *file) |
| 135 | { |
| 136 | return seq_open(file, &dasd_devices_seq_ops); |
| 137 | } |
| 138 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 139 | static const struct file_operations dasd_devices_file_ops = { |
Denis V. Lunev | 8b59400 | 2008-04-29 01:02:20 -0700 | [diff] [blame] | 140 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | .open = dasd_devices_open, |
| 142 | .read = seq_read, |
| 143 | .llseek = seq_lseek, |
| 144 | .release = seq_release, |
| 145 | }; |
| 146 | |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 147 | #ifdef CONFIG_DASD_PROFILE |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 148 | static int dasd_stats_all_block_on(void) |
| 149 | { |
| 150 | int i, rc; |
| 151 | struct dasd_device *device; |
| 152 | |
| 153 | rc = 0; |
| 154 | for (i = 0; i < dasd_max_devindex; ++i) { |
| 155 | device = dasd_device_from_devindex(i); |
| 156 | if (IS_ERR(device)) |
| 157 | continue; |
| 158 | if (device->block) |
| 159 | rc = dasd_profile_on(&device->block->profile); |
| 160 | dasd_put_device(device); |
| 161 | if (rc) |
| 162 | return rc; |
| 163 | } |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | static void dasd_stats_all_block_off(void) |
| 168 | { |
| 169 | int i; |
| 170 | struct dasd_device *device; |
| 171 | |
| 172 | for (i = 0; i < dasd_max_devindex; ++i) { |
| 173 | device = dasd_device_from_devindex(i); |
| 174 | if (IS_ERR(device)) |
| 175 | continue; |
| 176 | if (device->block) |
| 177 | dasd_profile_off(&device->block->profile); |
| 178 | dasd_put_device(device); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | static void dasd_stats_all_block_reset(void) |
| 183 | { |
| 184 | int i; |
| 185 | struct dasd_device *device; |
| 186 | |
| 187 | for (i = 0; i < dasd_max_devindex; ++i) { |
| 188 | device = dasd_device_from_devindex(i); |
| 189 | if (IS_ERR(device)) |
| 190 | continue; |
| 191 | if (device->block) |
| 192 | dasd_profile_reset(&device->block->profile); |
| 193 | dasd_put_device(device); |
| 194 | } |
| 195 | } |
| 196 | |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 197 | static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
| 199 | int i; |
| 200 | |
| 201 | for (i = 0; i < 32; i++) { |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 202 | seq_printf(m, "%7d ", array[i] / factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (i == 15) |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 204 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 206 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 208 | #endif /* CONFIG_DASD_PROFILE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 210 | static int dasd_stats_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | #ifdef CONFIG_DASD_PROFILE |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 213 | struct dasd_profile_info *prof; |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 214 | int factor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | /* check for active profiling */ |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 217 | if (!dasd_global_profile_level) { |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 218 | seq_printf(m, "Statistics are off - they might be " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | "switched on using 'echo set on > " |
| 220 | "/proc/dasd/statistics'\n"); |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 221 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 223 | prof = &dasd_global_profile_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
Uwe Kleine-König | fbfecd3 | 2009-10-28 20:11:04 +0100 | [diff] [blame] | 225 | /* prevent counter 'overflow' on output */ |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 226 | for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; |
| 227 | factor *= 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 229 | seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); |
| 230 | seq_printf(m, "with %u sectors(512B each)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | prof->dasd_io_sects); |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 232 | seq_printf(m, "Scale Factor is %d\n", factor); |
| 233 | seq_printf(m, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | " __<4 ___8 __16 __32 __64 _128 " |
| 235 | " _256 _512 __1k __2k __4k __8k " |
| 236 | " _16k _32k _64k 128k\n"); |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 237 | seq_printf(m, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | " _256 _512 __1M __2M __4M __8M " |
| 239 | " _16M _32M _64M 128M 256M 512M " |
| 240 | " __1G __2G __4G " " _>4G\n"); |
| 241 | |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 242 | seq_printf(m, "Histogram of sizes (512B secs)\n"); |
| 243 | dasd_statistics_array(m, prof->dasd_io_secs, factor); |
| 244 | seq_printf(m, "Histogram of I/O times (microseconds)\n"); |
| 245 | dasd_statistics_array(m, prof->dasd_io_times, factor); |
| 246 | seq_printf(m, "Histogram of I/O times per sector\n"); |
| 247 | dasd_statistics_array(m, prof->dasd_io_timps, factor); |
| 248 | seq_printf(m, "Histogram of I/O time till ssch\n"); |
| 249 | dasd_statistics_array(m, prof->dasd_io_time1, factor); |
| 250 | seq_printf(m, "Histogram of I/O time between ssch and irq\n"); |
| 251 | dasd_statistics_array(m, prof->dasd_io_time2, factor); |
| 252 | seq_printf(m, "Histogram of I/O time between ssch " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | "and irq per sector\n"); |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 254 | dasd_statistics_array(m, prof->dasd_io_time2ps, factor); |
| 255 | seq_printf(m, "Histogram of I/O time between irq and end\n"); |
| 256 | dasd_statistics_array(m, prof->dasd_io_time3, factor); |
| 257 | seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); |
| 258 | dasd_statistics_array(m, prof->dasd_io_nr_req, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | #else |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 260 | seq_printf(m, "Statistics are not activated in this kernel\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | #endif |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 262 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 265 | static int dasd_stats_proc_open(struct inode *inode, struct file *file) |
| 266 | { |
| 267 | return single_open(file, dasd_stats_proc_show, NULL); |
| 268 | } |
| 269 | |
| 270 | static ssize_t dasd_stats_proc_write(struct file *file, |
| 271 | const char __user *user_buf, size_t user_len, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | { |
| 273 | #ifdef CONFIG_DASD_PROFILE |
| 274 | char *buffer, *str; |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 275 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | if (user_len > 65536) |
| 278 | user_len = 65536; |
| 279 | buffer = dasd_get_user_string(user_buf, user_len); |
| 280 | if (IS_ERR(buffer)) |
| 281 | return PTR_ERR(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | /* check for valid verbs */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 284 | str = skip_spaces(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { |
| 286 | /* 'set xxx' was given */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 287 | str = skip_spaces(str + 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (strcmp(str, "on") == 0) { |
| 289 | /* switch on statistics profiling */ |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 290 | rc = dasd_stats_all_block_on(); |
| 291 | if (rc) { |
| 292 | dasd_stats_all_block_off(); |
| 293 | goto out_error; |
| 294 | } |
| 295 | dasd_global_profile_reset(); |
| 296 | dasd_global_profile_level = DASD_PROFILE_ON; |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 297 | pr_info("The statistics feature has been switched " |
| 298 | "on\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } else if (strcmp(str, "off") == 0) { |
| 300 | /* switch off and reset statistics profiling */ |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 301 | dasd_global_profile_level = DASD_PROFILE_OFF; |
| 302 | dasd_global_profile_reset(); |
| 303 | dasd_stats_all_block_off(); |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 304 | pr_info("The statistics feature has been switched " |
| 305 | "off\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } else |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 307 | goto out_parse_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } else if (strncmp(str, "reset", 5) == 0) { |
| 309 | /* reset the statistics */ |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 310 | dasd_global_profile_reset(); |
| 311 | dasd_stats_all_block_reset(); |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 312 | pr_info("The statistics have been reset\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | } else |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 314 | goto out_parse_error; |
Stefan Weinhuber | e4258d5 | 2011-08-03 16:44:20 +0200 | [diff] [blame^] | 315 | vfree(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | return user_len; |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 317 | out_parse_error: |
| 318 | rc = -EINVAL; |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 319 | pr_warning("%s is not a supported value for /proc/dasd/statistics\n", |
| 320 | str); |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 321 | out_error: |
Stefan Weinhuber | e4258d5 | 2011-08-03 16:44:20 +0200 | [diff] [blame^] | 322 | vfree(buffer); |
Stefan Weinhuber | 4fa52aa | 2011-07-24 10:48:32 +0200 | [diff] [blame] | 323 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | #else |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 325 | pr_warning("/proc/dasd/statistics: is not activated in this kernel\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | return user_len; |
| 327 | #endif /* CONFIG_DASD_PROFILE */ |
| 328 | } |
| 329 | |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 330 | static const struct file_operations dasd_stats_proc_fops = { |
| 331 | .owner = THIS_MODULE, |
| 332 | .open = dasd_stats_proc_open, |
| 333 | .read = seq_read, |
| 334 | .llseek = seq_lseek, |
| 335 | .release = single_release, |
| 336 | .write = dasd_stats_proc_write, |
| 337 | }; |
| 338 | |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 339 | /* |
| 340 | * Create dasd proc-fs entries. |
| 341 | * In case creation failed, cleanup and return -ENOENT. |
| 342 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | int |
| 344 | dasd_proc_init(void) |
| 345 | { |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 346 | dasd_proc_root_entry = proc_mkdir("dasd", NULL); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 347 | if (!dasd_proc_root_entry) |
| 348 | goto out_nodasd; |
Denis V. Lunev | 8b59400 | 2008-04-29 01:02:20 -0700 | [diff] [blame] | 349 | dasd_devices_entry = proc_create("devices", |
| 350 | S_IFREG | S_IRUGO | S_IWUSR, |
| 351 | dasd_proc_root_entry, |
| 352 | &dasd_devices_file_ops); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 353 | if (!dasd_devices_entry) |
| 354 | goto out_nodevices; |
Alexey Dobriyan | 34b9243 | 2010-02-26 22:37:50 +0100 | [diff] [blame] | 355 | dasd_statistics_entry = proc_create("statistics", |
| 356 | S_IFREG | S_IRUGO | S_IWUSR, |
| 357 | dasd_proc_root_entry, |
| 358 | &dasd_stats_proc_fops); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 359 | if (!dasd_statistics_entry) |
| 360 | goto out_nostatistics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | return 0; |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 362 | |
| 363 | out_nostatistics: |
| 364 | remove_proc_entry("devices", dasd_proc_root_entry); |
| 365 | out_nodevices: |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 366 | remove_proc_entry("dasd", NULL); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 367 | out_nodasd: |
| 368 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | void |
| 372 | dasd_proc_exit(void) |
| 373 | { |
| 374 | remove_proc_entry("devices", dasd_proc_root_entry); |
| 375 | remove_proc_entry("statistics", dasd_proc_root_entry); |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 376 | remove_proc_entry("dasd", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |