Commit | Line | Data |
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1da177e4 LT |
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 | * | |
1da177e4 LT |
12 | */ |
13 | ||
1da177e4 LT |
14 | #include <linux/ctype.h> |
15 | #include <linux/seq_file.h> | |
16 | #include <linux/vmalloc.h> | |
66a464db | 17 | #include <linux/proc_fs.h> |
1da177e4 LT |
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 | ||
3d62149f | 31 | #ifdef CONFIG_DASD_PROFILE |
4d284cac | 32 | static char * |
1da177e4 LT |
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 | } | |
3d62149f | 51 | #endif /* CONFIG_DASD_PROFILE */ |
1da177e4 LT |
52 | |
53 | static int | |
54 | dasd_devices_show(struct seq_file *m, void *v) | |
55 | { | |
56 | struct dasd_device *device; | |
8e09f215 | 57 | struct dasd_block *block; |
1da177e4 LT |
58 | char *substr; |
59 | ||
60 | device = dasd_device_from_devindex((unsigned long) v - 1); | |
61 | if (IS_ERR(device)) | |
62 | return 0; | |
8e09f215 SW |
63 | if (device->block) |
64 | block = device->block; | |
a5e23839 SW |
65 | else { |
66 | dasd_put_device(device); | |
8e09f215 | 67 | return 0; |
a5e23839 | 68 | } |
1da177e4 LT |
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. */ | |
8e09f215 | 77 | if (block->gdp) |
1da177e4 | 78 | seq_printf(m, " at (%3d:%6d)", |
f331c029 TH |
79 | MAJOR(disk_devt(block->gdp)), |
80 | MINOR(disk_devt(block->gdp))); | |
1da177e4 LT |
81 | else |
82 | seq_printf(m, " at (???:??????)"); | |
83 | /* Print device name. */ | |
8e09f215 SW |
84 | if (block->gdp) |
85 | seq_printf(m, " is %-8s", block->gdp->disk_name); | |
1da177e4 LT |
86 | else |
87 | seq_printf(m, " is ????????"); | |
88 | /* Print devices features. */ | |
c6eb7b77 | 89 | substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; |
1da177e4 LT |
90 | seq_printf(m, "%4s: ", substr); |
91 | /* Print device status information. */ | |
92 | switch ((device != NULL) ? device->state : -1) { | |
93 | case -1: | |
94 | seq_printf(m, "unknown"); | |
95 | break; | |
96 | case DASD_STATE_NEW: | |
97 | seq_printf(m, "new"); | |
98 | break; | |
99 | case DASD_STATE_KNOWN: | |
100 | seq_printf(m, "detected"); | |
101 | break; | |
102 | case DASD_STATE_BASIC: | |
103 | seq_printf(m, "basic"); | |
104 | break; | |
90f0094d | 105 | case DASD_STATE_UNFMT: |
b707dbe6 | 106 | seq_printf(m, "unformatted"); |
90f0094d | 107 | break; |
1da177e4 LT |
108 | case DASD_STATE_READY: |
109 | case DASD_STATE_ONLINE: | |
110 | seq_printf(m, "active "); | |
8e09f215 | 111 | if (dasd_check_blocksize(block->bp_block)) |
1da177e4 LT |
112 | seq_printf(m, "n/f "); |
113 | else | |
114 | seq_printf(m, | |
115 | "at blocksize: %d, %ld blocks, %ld MB", | |
8e09f215 SW |
116 | block->bp_block, block->blocks, |
117 | ((block->bp_block >> 9) * | |
118 | block->blocks) >> 11); | |
1da177e4 LT |
119 | break; |
120 | default: | |
121 | seq_printf(m, "no stat"); | |
122 | break; | |
123 | } | |
124 | dasd_put_device(device); | |
125 | if (dasd_probeonly) | |
126 | seq_printf(m, "(probeonly)"); | |
127 | seq_printf(m, "\n"); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static void *dasd_devices_start(struct seq_file *m, loff_t *pos) | |
132 | { | |
133 | if (*pos >= dasd_max_devindex) | |
134 | return NULL; | |
135 | return (void *)((unsigned long) *pos + 1); | |
136 | } | |
137 | ||
138 | static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) | |
139 | { | |
140 | ++*pos; | |
141 | return dasd_devices_start(m, pos); | |
142 | } | |
143 | ||
144 | static void dasd_devices_stop(struct seq_file *m, void *v) | |
145 | { | |
146 | } | |
147 | ||
5c81cdbe | 148 | static const struct seq_operations dasd_devices_seq_ops = { |
1da177e4 LT |
149 | .start = dasd_devices_start, |
150 | .next = dasd_devices_next, | |
151 | .stop = dasd_devices_stop, | |
152 | .show = dasd_devices_show, | |
153 | }; | |
154 | ||
155 | static int dasd_devices_open(struct inode *inode, struct file *file) | |
156 | { | |
157 | return seq_open(file, &dasd_devices_seq_ops); | |
158 | } | |
159 | ||
d54b1fdb | 160 | static const struct file_operations dasd_devices_file_ops = { |
8b594007 | 161 | .owner = THIS_MODULE, |
1da177e4 LT |
162 | .open = dasd_devices_open, |
163 | .read = seq_read, | |
164 | .llseek = seq_lseek, | |
165 | .release = seq_release, | |
166 | }; | |
167 | ||
4d284cac | 168 | static int |
1da177e4 LT |
169 | dasd_calc_metrics(char *page, char **start, off_t off, |
170 | int count, int *eof, int len) | |
171 | { | |
172 | len = (len > off) ? len - off : 0; | |
173 | if (len > count) | |
174 | len = count; | |
175 | if (len < count) | |
176 | *eof = 1; | |
177 | *start = page + off; | |
178 | return len; | |
179 | } | |
180 | ||
3d62149f | 181 | #ifdef CONFIG_DASD_PROFILE |
4d284cac | 182 | static char * |
2b67fc46 | 183 | dasd_statistics_array(char *str, unsigned int *array, int shift) |
1da177e4 LT |
184 | { |
185 | int i; | |
186 | ||
187 | for (i = 0; i < 32; i++) { | |
188 | str += sprintf(str, "%7d ", array[i] >> shift); | |
189 | if (i == 15) | |
190 | str += sprintf(str, "\n"); | |
191 | } | |
192 | str += sprintf(str,"\n"); | |
193 | return str; | |
194 | } | |
3d62149f | 195 | #endif /* CONFIG_DASD_PROFILE */ |
1da177e4 LT |
196 | |
197 | static int | |
198 | dasd_statistics_read(char *page, char **start, off_t off, | |
199 | int count, int *eof, void *data) | |
200 | { | |
201 | unsigned long len; | |
202 | #ifdef CONFIG_DASD_PROFILE | |
203 | struct dasd_profile_info_t *prof; | |
204 | char *str; | |
205 | int shift; | |
206 | ||
207 | /* check for active profiling */ | |
208 | if (dasd_profile_level == DASD_PROFILE_OFF) { | |
209 | len = sprintf(page, "Statistics are off - they might be " | |
210 | "switched on using 'echo set on > " | |
211 | "/proc/dasd/statistics'\n"); | |
212 | return dasd_calc_metrics(page, start, off, count, eof, len); | |
213 | } | |
214 | ||
215 | prof = &dasd_global_profile; | |
216 | /* prevent couter 'overflow' on output */ | |
217 | for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); | |
218 | ||
219 | str = page; | |
220 | str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); | |
221 | str += sprintf(str, "with %d sectors(512B each)\n", | |
222 | prof->dasd_io_sects); | |
223 | str += sprintf(str, | |
224 | " __<4 ___8 __16 __32 __64 _128 " | |
225 | " _256 _512 __1k __2k __4k __8k " | |
226 | " _16k _32k _64k 128k\n"); | |
227 | str += sprintf(str, | |
228 | " _256 _512 __1M __2M __4M __8M " | |
229 | " _16M _32M _64M 128M 256M 512M " | |
230 | " __1G __2G __4G " " _>4G\n"); | |
231 | ||
232 | str += sprintf(str, "Histogram of sizes (512B secs)\n"); | |
233 | str = dasd_statistics_array(str, prof->dasd_io_secs, shift); | |
234 | str += sprintf(str, "Histogram of I/O times (microseconds)\n"); | |
235 | str = dasd_statistics_array(str, prof->dasd_io_times, shift); | |
236 | str += sprintf(str, "Histogram of I/O times per sector\n"); | |
237 | str = dasd_statistics_array(str, prof->dasd_io_timps, shift); | |
238 | str += sprintf(str, "Histogram of I/O time till ssch\n"); | |
239 | str = dasd_statistics_array(str, prof->dasd_io_time1, shift); | |
240 | str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); | |
241 | str = dasd_statistics_array(str, prof->dasd_io_time2, shift); | |
242 | str += sprintf(str, "Histogram of I/O time between ssch " | |
243 | "and irq per sector\n"); | |
244 | str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); | |
245 | str += sprintf(str, "Histogram of I/O time between irq and end\n"); | |
246 | str = dasd_statistics_array(str, prof->dasd_io_time3, shift); | |
247 | str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); | |
248 | str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); | |
249 | len = str - page; | |
250 | #else | |
251 | len = sprintf(page, "Statistics are not activated in this kernel\n"); | |
252 | #endif | |
253 | return dasd_calc_metrics(page, start, off, count, eof, len); | |
254 | } | |
255 | ||
256 | static int | |
257 | dasd_statistics_write(struct file *file, const char __user *user_buf, | |
258 | unsigned long user_len, void *data) | |
259 | { | |
260 | #ifdef CONFIG_DASD_PROFILE | |
261 | char *buffer, *str; | |
262 | ||
263 | if (user_len > 65536) | |
264 | user_len = 65536; | |
265 | buffer = dasd_get_user_string(user_buf, user_len); | |
266 | if (IS_ERR(buffer)) | |
267 | return PTR_ERR(buffer); | |
268 | MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); | |
269 | ||
270 | /* check for valid verbs */ | |
271 | for (str = buffer; isspace(*str); str++); | |
272 | if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { | |
273 | /* 'set xxx' was given */ | |
274 | for (str = str + 4; isspace(*str); str++); | |
275 | if (strcmp(str, "on") == 0) { | |
276 | /* switch on statistics profiling */ | |
277 | dasd_profile_level = DASD_PROFILE_ON; | |
278 | MESSAGE(KERN_INFO, "%s", "Statistics switched on"); | |
279 | } else if (strcmp(str, "off") == 0) { | |
280 | /* switch off and reset statistics profiling */ | |
281 | memset(&dasd_global_profile, | |
282 | 0, sizeof (struct dasd_profile_info_t)); | |
283 | dasd_profile_level = DASD_PROFILE_OFF; | |
284 | MESSAGE(KERN_INFO, "%s", "Statistics switched off"); | |
285 | } else | |
286 | goto out_error; | |
287 | } else if (strncmp(str, "reset", 5) == 0) { | |
288 | /* reset the statistics */ | |
289 | memset(&dasd_global_profile, 0, | |
290 | sizeof (struct dasd_profile_info_t)); | |
291 | MESSAGE(KERN_INFO, "%s", "Statistics reset"); | |
292 | } else | |
293 | goto out_error; | |
294 | kfree(buffer); | |
295 | return user_len; | |
296 | out_error: | |
297 | MESSAGE(KERN_WARNING, "%s", | |
298 | "/proc/dasd/statistics: only 'set on', 'set off' " | |
299 | "and 'reset' are supported verbs"); | |
300 | kfree(buffer); | |
301 | return -EINVAL; | |
302 | #else | |
303 | MESSAGE(KERN_WARNING, "%s", | |
304 | "/proc/dasd/statistics: is not activated in this kernel"); | |
305 | return user_len; | |
306 | #endif /* CONFIG_DASD_PROFILE */ | |
307 | } | |
308 | ||
7220fe8b HH |
309 | /* |
310 | * Create dasd proc-fs entries. | |
311 | * In case creation failed, cleanup and return -ENOENT. | |
312 | */ | |
1da177e4 LT |
313 | int |
314 | dasd_proc_init(void) | |
315 | { | |
c74c120a | 316 | dasd_proc_root_entry = proc_mkdir("dasd", NULL); |
7220fe8b HH |
317 | if (!dasd_proc_root_entry) |
318 | goto out_nodasd; | |
1da177e4 | 319 | dasd_proc_root_entry->owner = THIS_MODULE; |
8b594007 DL |
320 | dasd_devices_entry = proc_create("devices", |
321 | S_IFREG | S_IRUGO | S_IWUSR, | |
322 | dasd_proc_root_entry, | |
323 | &dasd_devices_file_ops); | |
7220fe8b HH |
324 | if (!dasd_devices_entry) |
325 | goto out_nodevices; | |
1da177e4 LT |
326 | dasd_statistics_entry = create_proc_entry("statistics", |
327 | S_IFREG | S_IRUGO | S_IWUSR, | |
328 | dasd_proc_root_entry); | |
7220fe8b HH |
329 | if (!dasd_statistics_entry) |
330 | goto out_nostatistics; | |
1da177e4 LT |
331 | dasd_statistics_entry->read_proc = dasd_statistics_read; |
332 | dasd_statistics_entry->write_proc = dasd_statistics_write; | |
333 | dasd_statistics_entry->owner = THIS_MODULE; | |
334 | return 0; | |
7220fe8b HH |
335 | |
336 | out_nostatistics: | |
337 | remove_proc_entry("devices", dasd_proc_root_entry); | |
338 | out_nodevices: | |
c74c120a | 339 | remove_proc_entry("dasd", NULL); |
7220fe8b HH |
340 | out_nodasd: |
341 | return -ENOENT; | |
1da177e4 LT |
342 | } |
343 | ||
344 | void | |
345 | dasd_proc_exit(void) | |
346 | { | |
347 | remove_proc_entry("devices", dasd_proc_root_entry); | |
348 | remove_proc_entry("statistics", dasd_proc_root_entry); | |
c74c120a | 349 | remove_proc_entry("dasd", NULL); |
1da177e4 | 350 | } |