1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 * Coypright IBM Corp. 1999, 2002 9 * 10 * /proc interface for the dasd driver. 11 * 12 */ 13 14 #define KMSG_COMPONENT "dasd" 15 16 #include <linux/ctype.h> 17 #include <linux/slab.h> 18 #include <linux/string.h> 19 #include <linux/seq_file.h> 20 #include <linux/vmalloc.h> 21 #include <linux/proc_fs.h> 22 23 #include <asm/debug.h> 24 #include <linux/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 35 static int 36 dasd_devices_show(struct seq_file *m, void *v) 37 { 38 struct dasd_device *device; 39 struct dasd_block *block; 40 char *substr; 41 42 device = dasd_device_from_devindex((unsigned long) v - 1); 43 if (IS_ERR(device)) 44 return 0; 45 if (device->block) 46 block = device->block; 47 else { 48 dasd_put_device(device); 49 return 0; 50 } 51 /* Print device number. */ 52 seq_printf(m, "%s", dev_name(&device->cdev->dev)); 53 /* Print discipline string. */ 54 if (device->discipline != NULL) 55 seq_printf(m, "(%s)", device->discipline->name); 56 else 57 seq_printf(m, "(none)"); 58 /* Print kdev. */ 59 if (block->gdp) 60 seq_printf(m, " at (%3d:%6d)", 61 MAJOR(disk_devt(block->gdp)), 62 MINOR(disk_devt(block->gdp))); 63 else 64 seq_printf(m, " at (???:??????)"); 65 /* Print device name. */ 66 if (block->gdp) 67 seq_printf(m, " is %-8s", block->gdp->disk_name); 68 else 69 seq_printf(m, " is ????????"); 70 /* Print devices features. */ 71 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 72 seq_printf(m, "%4s: ", substr); 73 /* Print device status information. */ 74 switch (device->state) { 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; 84 case DASD_STATE_UNFMT: 85 seq_printf(m, "unformatted"); 86 break; 87 case DASD_STATE_READY: 88 case DASD_STATE_ONLINE: 89 seq_printf(m, "active "); 90 if (dasd_check_blocksize(block->bp_block)) 91 seq_printf(m, "n/f "); 92 else 93 seq_printf(m, 94 "at blocksize: %u, %lu blocks, %lu MB", 95 block->bp_block, block->blocks, 96 ((block->bp_block >> 9) * 97 block->blocks) >> 11); 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 } 126 127 static const struct seq_operations dasd_devices_seq_ops = { 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 } 138 139 static const struct file_operations dasd_devices_file_ops = { 140 .owner = THIS_MODULE, 141 .open = dasd_devices_open, 142 .read = seq_read, 143 .llseek = seq_lseek, 144 .release = seq_release, 145 }; 146 147 #ifdef CONFIG_DASD_PROFILE 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 } 196 197 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor) 198 { 199 int i; 200 201 for (i = 0; i < 32; i++) { 202 seq_printf(m, "%7d ", array[i] / factor); 203 if (i == 15) 204 seq_putc(m, '\n'); 205 } 206 seq_putc(m, '\n'); 207 } 208 #endif /* CONFIG_DASD_PROFILE */ 209 210 static int dasd_stats_proc_show(struct seq_file *m, void *v) 211 { 212 #ifdef CONFIG_DASD_PROFILE 213 struct dasd_profile_info *prof; 214 int factor; 215 216 spin_lock_bh(&dasd_global_profile.lock); 217 prof = dasd_global_profile.data; 218 if (!prof) { 219 spin_unlock_bh(&dasd_global_profile.lock); 220 seq_printf(m, "Statistics are off - they might be " 221 "switched on using 'echo set on > " 222 "/proc/dasd/statistics'\n"); 223 return 0; 224 } 225 226 /* prevent counter 'overflow' on output */ 227 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; 228 factor *= 10); 229 230 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); 231 seq_printf(m, "with %u sectors(512B each)\n", 232 prof->dasd_io_sects); 233 seq_printf(m, "Scale Factor is %d\n", factor); 234 seq_printf(m, 235 " __<4 ___8 __16 __32 __64 _128 " 236 " _256 _512 __1k __2k __4k __8k " 237 " _16k _32k _64k 128k\n"); 238 seq_printf(m, 239 " _256 _512 __1M __2M __4M __8M " 240 " _16M _32M _64M 128M 256M 512M " 241 " __1G __2G __4G " " _>4G\n"); 242 243 seq_printf(m, "Histogram of sizes (512B secs)\n"); 244 dasd_statistics_array(m, prof->dasd_io_secs, factor); 245 seq_printf(m, "Histogram of I/O times (microseconds)\n"); 246 dasd_statistics_array(m, prof->dasd_io_times, factor); 247 seq_printf(m, "Histogram of I/O times per sector\n"); 248 dasd_statistics_array(m, prof->dasd_io_timps, factor); 249 seq_printf(m, "Histogram of I/O time till ssch\n"); 250 dasd_statistics_array(m, prof->dasd_io_time1, factor); 251 seq_printf(m, "Histogram of I/O time between ssch and irq\n"); 252 dasd_statistics_array(m, prof->dasd_io_time2, factor); 253 seq_printf(m, "Histogram of I/O time between ssch " 254 "and irq per sector\n"); 255 dasd_statistics_array(m, prof->dasd_io_time2ps, factor); 256 seq_printf(m, "Histogram of I/O time between irq and end\n"); 257 dasd_statistics_array(m, prof->dasd_io_time3, factor); 258 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); 259 dasd_statistics_array(m, prof->dasd_io_nr_req, factor); 260 spin_unlock_bh(&dasd_global_profile.lock); 261 #else 262 seq_printf(m, "Statistics are not activated in this kernel\n"); 263 #endif 264 return 0; 265 } 266 267 static int dasd_stats_proc_open(struct inode *inode, struct file *file) 268 { 269 return single_open(file, dasd_stats_proc_show, NULL); 270 } 271 272 static ssize_t dasd_stats_proc_write(struct file *file, 273 const char __user *user_buf, size_t user_len, loff_t *pos) 274 { 275 #ifdef CONFIG_DASD_PROFILE 276 char *buffer, *str; 277 int rc; 278 279 if (user_len > 65536) 280 user_len = 65536; 281 buffer = dasd_get_user_string(user_buf, user_len); 282 if (IS_ERR(buffer)) 283 return PTR_ERR(buffer); 284 285 /* check for valid verbs */ 286 str = skip_spaces(buffer); 287 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 288 /* 'set xxx' was given */ 289 str = skip_spaces(str + 4); 290 if (strcmp(str, "on") == 0) { 291 /* switch on statistics profiling */ 292 rc = dasd_stats_all_block_on(); 293 if (rc) { 294 dasd_stats_all_block_off(); 295 goto out_error; 296 } 297 rc = dasd_profile_on(&dasd_global_profile); 298 if (rc) { 299 dasd_stats_all_block_off(); 300 goto out_error; 301 } 302 dasd_profile_reset(&dasd_global_profile); 303 dasd_global_profile_level = DASD_PROFILE_ON; 304 pr_info("The statistics feature has been switched " 305 "on\n"); 306 } else if (strcmp(str, "off") == 0) { 307 /* switch off statistics profiling */ 308 dasd_global_profile_level = DASD_PROFILE_OFF; 309 dasd_profile_off(&dasd_global_profile); 310 dasd_stats_all_block_off(); 311 pr_info("The statistics feature has been switched " 312 "off\n"); 313 } else 314 goto out_parse_error; 315 } else if (strncmp(str, "reset", 5) == 0) { 316 /* reset the statistics */ 317 dasd_profile_reset(&dasd_global_profile); 318 dasd_stats_all_block_reset(); 319 pr_info("The statistics have been reset\n"); 320 } else 321 goto out_parse_error; 322 vfree(buffer); 323 return user_len; 324 out_parse_error: 325 rc = -EINVAL; 326 pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str); 327 out_error: 328 vfree(buffer); 329 return rc; 330 #else 331 pr_warn("/proc/dasd/statistics: is not activated in this kernel\n"); 332 return user_len; 333 #endif /* CONFIG_DASD_PROFILE */ 334 } 335 336 static const struct file_operations dasd_stats_proc_fops = { 337 .owner = THIS_MODULE, 338 .open = dasd_stats_proc_open, 339 .read = seq_read, 340 .llseek = seq_lseek, 341 .release = single_release, 342 .write = dasd_stats_proc_write, 343 }; 344 345 /* 346 * Create dasd proc-fs entries. 347 * In case creation failed, cleanup and return -ENOENT. 348 */ 349 int 350 dasd_proc_init(void) 351 { 352 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 353 if (!dasd_proc_root_entry) 354 goto out_nodasd; 355 dasd_devices_entry = proc_create("devices", 356 S_IFREG | S_IRUGO | S_IWUSR, 357 dasd_proc_root_entry, 358 &dasd_devices_file_ops); 359 if (!dasd_devices_entry) 360 goto out_nodevices; 361 dasd_statistics_entry = proc_create("statistics", 362 S_IFREG | S_IRUGO | S_IWUSR, 363 dasd_proc_root_entry, 364 &dasd_stats_proc_fops); 365 if (!dasd_statistics_entry) 366 goto out_nostatistics; 367 return 0; 368 369 out_nostatistics: 370 remove_proc_entry("devices", dasd_proc_root_entry); 371 out_nodevices: 372 remove_proc_entry("dasd", NULL); 373 out_nodasd: 374 return -ENOENT; 375 } 376 377 void 378 dasd_proc_exit(void) 379 { 380 remove_proc_entry("devices", dasd_proc_root_entry); 381 remove_proc_entry("statistics", dasd_proc_root_entry); 382 remove_proc_entry("dasd", NULL); 383 } 384