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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/ctype.h> |
| 15 | #include <linux/seq_file.h> |
| 16 | #include <linux/vmalloc.h> |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 17 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include <asm/debug.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | |
| 22 | /* This is ugly... */ |
| 23 | #define PRINTK_HEADER "dasd_proc:" |
| 24 | |
| 25 | #include "dasd_int.h" |
| 26 | |
| 27 | static struct proc_dir_entry *dasd_proc_root_entry = NULL; |
| 28 | static struct proc_dir_entry *dasd_devices_entry = NULL; |
| 29 | static struct proc_dir_entry *dasd_statistics_entry = NULL; |
| 30 | |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 31 | #ifdef CONFIG_DASD_PROFILE |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 32 | static char * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | dasd_get_user_string(const char __user *user_buf, size_t user_len) |
| 34 | { |
| 35 | char *buffer; |
| 36 | |
| 37 | buffer = kmalloc(user_len + 1, GFP_KERNEL); |
| 38 | if (buffer == NULL) |
| 39 | return ERR_PTR(-ENOMEM); |
| 40 | if (copy_from_user(buffer, user_buf, user_len) != 0) { |
| 41 | kfree(buffer); |
| 42 | return ERR_PTR(-EFAULT); |
| 43 | } |
| 44 | /* got the string, now strip linefeed. */ |
| 45 | if (buffer[user_len - 1] == '\n') |
| 46 | buffer[user_len - 1] = 0; |
| 47 | else |
| 48 | buffer[user_len] = 0; |
| 49 | return buffer; |
| 50 | } |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 51 | #endif /* CONFIG_DASD_PROFILE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | static int |
| 54 | dasd_devices_show(struct seq_file *m, void *v) |
| 55 | { |
| 56 | struct dasd_device *device; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 57 | struct dasd_block *block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | char *substr; |
| 59 | |
| 60 | device = dasd_device_from_devindex((unsigned long) v - 1); |
| 61 | if (IS_ERR(device)) |
| 62 | return 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 63 | if (device->block) |
| 64 | block = device->block; |
Stefan Weinhuber | a5e2383 | 2008-03-05 12:37:11 +0100 | [diff] [blame] | 65 | else { |
| 66 | dasd_put_device(device); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 67 | return 0; |
Stefan Weinhuber | a5e2383 | 2008-03-05 12:37:11 +0100 | [diff] [blame] | 68 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* Print device number. */ |
| 70 | seq_printf(m, "%s", device->cdev->dev.bus_id); |
| 71 | /* Print discipline string. */ |
| 72 | if (device != NULL && device->discipline != NULL) |
| 73 | seq_printf(m, "(%s)", device->discipline->name); |
| 74 | else |
| 75 | seq_printf(m, "(none)"); |
| 76 | /* Print kdev. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 77 | if (block->gdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | seq_printf(m, " at (%3d:%6d)", |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 79 | block->gdp->major, block->gdp->first_minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | else |
| 81 | seq_printf(m, " at (???:??????)"); |
| 82 | /* Print device name. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 83 | if (block->gdp) |
| 84 | seq_printf(m, " is %-8s", block->gdp->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | else |
| 86 | seq_printf(m, " is ????????"); |
| 87 | /* Print devices features. */ |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 88 | substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | seq_printf(m, "%4s: ", substr); |
| 90 | /* Print device status information. */ |
| 91 | switch ((device != NULL) ? device->state : -1) { |
| 92 | case -1: |
| 93 | seq_printf(m, "unknown"); |
| 94 | break; |
| 95 | case DASD_STATE_NEW: |
| 96 | seq_printf(m, "new"); |
| 97 | break; |
| 98 | case DASD_STATE_KNOWN: |
| 99 | seq_printf(m, "detected"); |
| 100 | break; |
| 101 | case DASD_STATE_BASIC: |
| 102 | seq_printf(m, "basic"); |
| 103 | break; |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 104 | case DASD_STATE_UNFMT: |
Horst Hummel | b707dbe | 2006-03-09 17:33:52 -0800 | [diff] [blame] | 105 | seq_printf(m, "unformatted"); |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 106 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | case DASD_STATE_READY: |
| 108 | case DASD_STATE_ONLINE: |
| 109 | seq_printf(m, "active "); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 110 | if (dasd_check_blocksize(block->bp_block)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | seq_printf(m, "n/f "); |
| 112 | else |
| 113 | seq_printf(m, |
| 114 | "at blocksize: %d, %ld blocks, %ld MB", |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 115 | block->bp_block, block->blocks, |
| 116 | ((block->bp_block >> 9) * |
| 117 | block->blocks) >> 11); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | break; |
| 119 | default: |
| 120 | seq_printf(m, "no stat"); |
| 121 | break; |
| 122 | } |
| 123 | dasd_put_device(device); |
| 124 | if (dasd_probeonly) |
| 125 | seq_printf(m, "(probeonly)"); |
| 126 | seq_printf(m, "\n"); |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static void *dasd_devices_start(struct seq_file *m, loff_t *pos) |
| 131 | { |
| 132 | if (*pos >= dasd_max_devindex) |
| 133 | return NULL; |
| 134 | return (void *)((unsigned long) *pos + 1); |
| 135 | } |
| 136 | |
| 137 | static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) |
| 138 | { |
| 139 | ++*pos; |
| 140 | return dasd_devices_start(m, pos); |
| 141 | } |
| 142 | |
| 143 | static void dasd_devices_stop(struct seq_file *m, void *v) |
| 144 | { |
| 145 | } |
| 146 | |
Jan Engelhardt | 5c81cdb | 2008-01-26 14:11:29 +0100 | [diff] [blame] | 147 | static const struct seq_operations dasd_devices_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | .start = dasd_devices_start, |
| 149 | .next = dasd_devices_next, |
| 150 | .stop = dasd_devices_stop, |
| 151 | .show = dasd_devices_show, |
| 152 | }; |
| 153 | |
| 154 | static int dasd_devices_open(struct inode *inode, struct file *file) |
| 155 | { |
| 156 | return seq_open(file, &dasd_devices_seq_ops); |
| 157 | } |
| 158 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 159 | static const struct file_operations dasd_devices_file_ops = { |
Denis V. Lunev | 8b59400 | 2008-04-29 01:02:20 -0700 | [diff] [blame^] | 160 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | .open = dasd_devices_open, |
| 162 | .read = seq_read, |
| 163 | .llseek = seq_lseek, |
| 164 | .release = seq_release, |
| 165 | }; |
| 166 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 167 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | dasd_calc_metrics(char *page, char **start, off_t off, |
| 169 | int count, int *eof, int len) |
| 170 | { |
| 171 | len = (len > off) ? len - off : 0; |
| 172 | if (len > count) |
| 173 | len = count; |
| 174 | if (len < count) |
| 175 | *eof = 1; |
| 176 | *start = page + off; |
| 177 | return len; |
| 178 | } |
| 179 | |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 180 | #ifdef CONFIG_DASD_PROFILE |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 181 | static char * |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 182 | dasd_statistics_array(char *str, unsigned int *array, int shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
| 184 | int i; |
| 185 | |
| 186 | for (i = 0; i < 32; i++) { |
| 187 | str += sprintf(str, "%7d ", array[i] >> shift); |
| 188 | if (i == 15) |
| 189 | str += sprintf(str, "\n"); |
| 190 | } |
| 191 | str += sprintf(str,"\n"); |
| 192 | return str; |
| 193 | } |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 194 | #endif /* CONFIG_DASD_PROFILE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
| 196 | static int |
| 197 | dasd_statistics_read(char *page, char **start, off_t off, |
| 198 | int count, int *eof, void *data) |
| 199 | { |
| 200 | unsigned long len; |
| 201 | #ifdef CONFIG_DASD_PROFILE |
| 202 | struct dasd_profile_info_t *prof; |
| 203 | char *str; |
| 204 | int shift; |
| 205 | |
| 206 | /* check for active profiling */ |
| 207 | if (dasd_profile_level == DASD_PROFILE_OFF) { |
| 208 | len = sprintf(page, "Statistics are off - they might be " |
| 209 | "switched on using 'echo set on > " |
| 210 | "/proc/dasd/statistics'\n"); |
| 211 | return dasd_calc_metrics(page, start, off, count, eof, len); |
| 212 | } |
| 213 | |
| 214 | prof = &dasd_global_profile; |
| 215 | /* prevent couter 'overflow' on output */ |
| 216 | for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); |
| 217 | |
| 218 | str = page; |
| 219 | str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); |
| 220 | str += sprintf(str, "with %d sectors(512B each)\n", |
| 221 | prof->dasd_io_sects); |
| 222 | str += sprintf(str, |
| 223 | " __<4 ___8 __16 __32 __64 _128 " |
| 224 | " _256 _512 __1k __2k __4k __8k " |
| 225 | " _16k _32k _64k 128k\n"); |
| 226 | str += sprintf(str, |
| 227 | " _256 _512 __1M __2M __4M __8M " |
| 228 | " _16M _32M _64M 128M 256M 512M " |
| 229 | " __1G __2G __4G " " _>4G\n"); |
| 230 | |
| 231 | str += sprintf(str, "Histogram of sizes (512B secs)\n"); |
| 232 | str = dasd_statistics_array(str, prof->dasd_io_secs, shift); |
| 233 | str += sprintf(str, "Histogram of I/O times (microseconds)\n"); |
| 234 | str = dasd_statistics_array(str, prof->dasd_io_times, shift); |
| 235 | str += sprintf(str, "Histogram of I/O times per sector\n"); |
| 236 | str = dasd_statistics_array(str, prof->dasd_io_timps, shift); |
| 237 | str += sprintf(str, "Histogram of I/O time till ssch\n"); |
| 238 | str = dasd_statistics_array(str, prof->dasd_io_time1, shift); |
| 239 | str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); |
| 240 | str = dasd_statistics_array(str, prof->dasd_io_time2, shift); |
| 241 | str += sprintf(str, "Histogram of I/O time between ssch " |
| 242 | "and irq per sector\n"); |
| 243 | str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); |
| 244 | str += sprintf(str, "Histogram of I/O time between irq and end\n"); |
| 245 | str = dasd_statistics_array(str, prof->dasd_io_time3, shift); |
| 246 | str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); |
| 247 | str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); |
| 248 | len = str - page; |
| 249 | #else |
| 250 | len = sprintf(page, "Statistics are not activated in this kernel\n"); |
| 251 | #endif |
| 252 | return dasd_calc_metrics(page, start, off, count, eof, len); |
| 253 | } |
| 254 | |
| 255 | static int |
| 256 | dasd_statistics_write(struct file *file, const char __user *user_buf, |
| 257 | unsigned long user_len, void *data) |
| 258 | { |
| 259 | #ifdef CONFIG_DASD_PROFILE |
| 260 | char *buffer, *str; |
| 261 | |
| 262 | if (user_len > 65536) |
| 263 | user_len = 65536; |
| 264 | buffer = dasd_get_user_string(user_buf, user_len); |
| 265 | if (IS_ERR(buffer)) |
| 266 | return PTR_ERR(buffer); |
| 267 | MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); |
| 268 | |
| 269 | /* check for valid verbs */ |
| 270 | for (str = buffer; isspace(*str); str++); |
| 271 | if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { |
| 272 | /* 'set xxx' was given */ |
| 273 | for (str = str + 4; isspace(*str); str++); |
| 274 | if (strcmp(str, "on") == 0) { |
| 275 | /* switch on statistics profiling */ |
| 276 | dasd_profile_level = DASD_PROFILE_ON; |
| 277 | MESSAGE(KERN_INFO, "%s", "Statistics switched on"); |
| 278 | } else if (strcmp(str, "off") == 0) { |
| 279 | /* switch off and reset statistics profiling */ |
| 280 | memset(&dasd_global_profile, |
| 281 | 0, sizeof (struct dasd_profile_info_t)); |
| 282 | dasd_profile_level = DASD_PROFILE_OFF; |
| 283 | MESSAGE(KERN_INFO, "%s", "Statistics switched off"); |
| 284 | } else |
| 285 | goto out_error; |
| 286 | } else if (strncmp(str, "reset", 5) == 0) { |
| 287 | /* reset the statistics */ |
| 288 | memset(&dasd_global_profile, 0, |
| 289 | sizeof (struct dasd_profile_info_t)); |
| 290 | MESSAGE(KERN_INFO, "%s", "Statistics reset"); |
| 291 | } else |
| 292 | goto out_error; |
| 293 | kfree(buffer); |
| 294 | return user_len; |
| 295 | out_error: |
| 296 | MESSAGE(KERN_WARNING, "%s", |
| 297 | "/proc/dasd/statistics: only 'set on', 'set off' " |
| 298 | "and 'reset' are supported verbs"); |
| 299 | kfree(buffer); |
| 300 | return -EINVAL; |
| 301 | #else |
| 302 | MESSAGE(KERN_WARNING, "%s", |
| 303 | "/proc/dasd/statistics: is not activated in this kernel"); |
| 304 | return user_len; |
| 305 | #endif /* CONFIG_DASD_PROFILE */ |
| 306 | } |
| 307 | |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 308 | /* |
| 309 | * Create dasd proc-fs entries. |
| 310 | * In case creation failed, cleanup and return -ENOENT. |
| 311 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | int |
| 313 | dasd_proc_init(void) |
| 314 | { |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 315 | dasd_proc_root_entry = proc_mkdir("dasd", NULL); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 316 | if (!dasd_proc_root_entry) |
| 317 | goto out_nodasd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | dasd_proc_root_entry->owner = THIS_MODULE; |
Denis V. Lunev | 8b59400 | 2008-04-29 01:02:20 -0700 | [diff] [blame^] | 319 | dasd_devices_entry = proc_create("devices", |
| 320 | S_IFREG | S_IRUGO | S_IWUSR, |
| 321 | dasd_proc_root_entry, |
| 322 | &dasd_devices_file_ops); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 323 | if (!dasd_devices_entry) |
| 324 | goto out_nodevices; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | dasd_statistics_entry = create_proc_entry("statistics", |
| 326 | S_IFREG | S_IRUGO | S_IWUSR, |
| 327 | dasd_proc_root_entry); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 328 | if (!dasd_statistics_entry) |
| 329 | goto out_nostatistics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | dasd_statistics_entry->read_proc = dasd_statistics_read; |
| 331 | dasd_statistics_entry->write_proc = dasd_statistics_write; |
| 332 | dasd_statistics_entry->owner = THIS_MODULE; |
| 333 | return 0; |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 334 | |
| 335 | out_nostatistics: |
| 336 | remove_proc_entry("devices", dasd_proc_root_entry); |
| 337 | out_nodevices: |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 338 | remove_proc_entry("dasd", NULL); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 339 | out_nodasd: |
| 340 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | void |
| 344 | dasd_proc_exit(void) |
| 345 | { |
| 346 | remove_proc_entry("devices", dasd_proc_root_entry); |
| 347 | remove_proc_entry("statistics", dasd_proc_root_entry); |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 348 | remove_proc_entry("dasd", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |