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