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Initial commit
[wrt350n-kernel.git] / drivers / s390 / block / dasd_proc.c
blob28a86f070048b4a3a25719fb100546df9cd8ebd8
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 *
12 */
13
14 #include <linux/ctype.h>
15 #include <linux/seq_file.h>
16 #include <linux/vmalloc.h>
17 #include <linux/proc_fs.h>
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 #ifdef CONFIG_DASD_PROFILE
32 static char *
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 }
51 #endif /* CONFIG_DASD_PROFILE */
52
53 static int
54 dasd_devices_show(struct seq_file *m, void *v)
55 {
56 struct dasd_device *device;
57 struct dasd_block *block;
58 char *substr;
59
60 device = dasd_device_from_devindex((unsigned long) v - 1);
61 if (IS_ERR(device))
62 return 0;
63 if (device->block)
64 block = device->block;
65 else
66 return 0;
67 /* Print device number. */
68 seq_printf(m, "%s", device->cdev->dev.bus_id);
69 /* Print discipline string. */
70 if (device != NULL && device->discipline != NULL)
71 seq_printf(m, "(%s)", device->discipline->name);
72 else
73 seq_printf(m, "(none)");
74 /* Print kdev. */
75 if (block->gdp)
76 seq_printf(m, " at (%3d:%6d)",
77 block->gdp->major, block->gdp->first_minor);
78 else
79 seq_printf(m, " at (???:??????)");
80 /* Print device name. */
81 if (block->gdp)
82 seq_printf(m, " is %-8s", block->gdp->disk_name);
83 else
84 seq_printf(m, " is ????????");
85 /* Print devices features. */
86 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
87 seq_printf(m, "%4s: ", substr);
88 /* Print device status information. */
89 switch ((device != NULL) ? device->state : -1) {
90 case -1:
91 seq_printf(m, "unknown");
92 break;
93 case DASD_STATE_NEW:
94 seq_printf(m, "new");
95 break;
96 case DASD_STATE_KNOWN:
97 seq_printf(m, "detected");
98 break;
99 case DASD_STATE_BASIC:
100 seq_printf(m, "basic");
101 break;
102 case DASD_STATE_UNFMT:
103 seq_printf(m, "unformatted");
104 break;
105 case DASD_STATE_READY:
106 case DASD_STATE_ONLINE:
107 seq_printf(m, "active ");
108 if (dasd_check_blocksize(block->bp_block))
109 seq_printf(m, "n/f ");
110 else
111 seq_printf(m,
112 "at blocksize: %d, %ld blocks, %ld MB",
113 block->bp_block, block->blocks,
114 ((block->bp_block >> 9) *
115 block->blocks) >> 11);
116 break;
117 default:
118 seq_printf(m, "no stat");
119 break;
120 }
121 dasd_put_device(device);
122 if (dasd_probeonly)
123 seq_printf(m, "(probeonly)");
124 seq_printf(m, "\n");
125 return 0;
126 }
127
128 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
129 {
130 if (*pos >= dasd_max_devindex)
131 return NULL;
132 return (void *)((unsigned long) *pos + 1);
133 }
134
135 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
136 {
137 ++*pos;
138 return dasd_devices_start(m, pos);
139 }
140
141 static void dasd_devices_stop(struct seq_file *m, void *v)
142 {
143 }
144
145 static const struct seq_operations dasd_devices_seq_ops = {
146 .start = dasd_devices_start,
147 .next = dasd_devices_next,
148 .stop = dasd_devices_stop,
149 .show = dasd_devices_show,
150 };
151
152 static int dasd_devices_open(struct inode *inode, struct file *file)
153 {
154 return seq_open(file, &dasd_devices_seq_ops);
155 }
156
157 static const struct file_operations dasd_devices_file_ops = {
158 .open = dasd_devices_open,
159 .read = seq_read,
160 .llseek = seq_lseek,
161 .release = seq_release,
162 };
163
164 static int
165 dasd_calc_metrics(char *page, char **start, off_t off,
166 int count, int *eof, int len)
167 {
168 len = (len > off) ? len - off : 0;
169 if (len > count)
170 len = count;
171 if (len < count)
172 *eof = 1;
173 *start = page + off;
174 return len;
175 }
176
177 #ifdef CONFIG_DASD_PROFILE
178 static char *
179 dasd_statistics_array(char *str, unsigned int *array, int shift)
180 {
181 int i;
182
183 for (i = 0; i < 32; i++) {
184 str += sprintf(str, "%7d ", array[i] >> shift);
185 if (i == 15)
186 str += sprintf(str, "\n");
187 }
188 str += sprintf(str,"\n");
189 return str;
190 }
191 #endif /* CONFIG_DASD_PROFILE */
192
193 static int
194 dasd_statistics_read(char *page, char **start, off_t off,
195 int count, int *eof, void *data)
196 {
197 unsigned long len;
198 #ifdef CONFIG_DASD_PROFILE
199 struct dasd_profile_info_t *prof;
200 char *str;
201 int shift;
202
203 /* check for active profiling */
204 if (dasd_profile_level == DASD_PROFILE_OFF) {
205 len = sprintf(page, "Statistics are off - they might be "
206 "switched on using 'echo set on > "
207 "/proc/dasd/statistics'\n");
208 return dasd_calc_metrics(page, start, off, count, eof, len);
209 }
210
211 prof = &dasd_global_profile;
212 /* prevent couter 'overflow' on output */
213 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
214
215 str = page;
216 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
217 str += sprintf(str, "with %d sectors(512B each)\n",
218 prof->dasd_io_sects);
219 str += sprintf(str,
220 " __<4 ___8 __16 __32 __64 _128 "
221 " _256 _512 __1k __2k __4k __8k "
222 " _16k _32k _64k 128k\n");
223 str += sprintf(str,
224 " _256 _512 __1M __2M __4M __8M "
225 " _16M _32M _64M 128M 256M 512M "
226 " __1G __2G __4G " " _>4G\n");
227
228 str += sprintf(str, "Histogram of sizes (512B secs)\n");
229 str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
230 str += sprintf(str, "Histogram of I/O times (microseconds)\n");
231 str = dasd_statistics_array(str, prof->dasd_io_times, shift);
232 str += sprintf(str, "Histogram of I/O times per sector\n");
233 str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
234 str += sprintf(str, "Histogram of I/O time till ssch\n");
235 str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
236 str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
237 str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
238 str += sprintf(str, "Histogram of I/O time between ssch "
239 "and irq per sector\n");
240 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
241 str += sprintf(str, "Histogram of I/O time between irq and end\n");
242 str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
243 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
244 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
245 len = str - page;
246 #else
247 len = sprintf(page, "Statistics are not activated in this kernel\n");
248 #endif
249 return dasd_calc_metrics(page, start, off, count, eof, len);
250 }
251
252 static int
253 dasd_statistics_write(struct file *file, const char __user *user_buf,
254 unsigned long user_len, void *data)
255 {
256 #ifdef CONFIG_DASD_PROFILE
257 char *buffer, *str;
258
259 if (user_len > 65536)
260 user_len = 65536;
261 buffer = dasd_get_user_string(user_buf, user_len);
262 if (IS_ERR(buffer))
263 return PTR_ERR(buffer);
264 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
265
266 /* check for valid verbs */
267 for (str = buffer; isspace(*str); str++);
268 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
269 /* 'set xxx' was given */
270 for (str = str + 4; isspace(*str); str++);
271 if (strcmp(str, "on") == 0) {
272 /* switch on statistics profiling */
273 dasd_profile_level = DASD_PROFILE_ON;
274 MESSAGE(KERN_INFO, "%s", "Statistics switched on");
275 } else if (strcmp(str, "off") == 0) {
276 /* switch off and reset statistics profiling */
277 memset(&dasd_global_profile,
278 0, sizeof (struct dasd_profile_info_t));
279 dasd_profile_level = DASD_PROFILE_OFF;
280 MESSAGE(KERN_INFO, "%s", "Statistics switched off");
281 } else
282 goto out_error;
283 } else if (strncmp(str, "reset", 5) == 0) {
284 /* reset the statistics */
285 memset(&dasd_global_profile, 0,
286 sizeof (struct dasd_profile_info_t));
287 MESSAGE(KERN_INFO, "%s", "Statistics reset");
288 } else
289 goto out_error;
290 kfree(buffer);
291 return user_len;
292 out_error:
293 MESSAGE(KERN_WARNING, "%s",
294 "/proc/dasd/statistics: only 'set on', 'set off' "
295 "and 'reset' are supported verbs");
296 kfree(buffer);
297 return -EINVAL;
298 #else
299 MESSAGE(KERN_WARNING, "%s",
300 "/proc/dasd/statistics: is not activated in this kernel");
301 return user_len;
302 #endif /* CONFIG_DASD_PROFILE */
303 }
304
305 /*
306 * Create dasd proc-fs entries.
307 * In case creation failed, cleanup and return -ENOENT.
308 */
309 int
310 dasd_proc_init(void)
311 {
312 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
313 if (!dasd_proc_root_entry)
314 goto out_nodasd;
315 dasd_proc_root_entry->owner = THIS_MODULE;
316 dasd_devices_entry = create_proc_entry("devices",
317 S_IFREG | S_IRUGO | S_IWUSR,
318 dasd_proc_root_entry);
319 if (!dasd_devices_entry)
320 goto out_nodevices;
321 dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
322 dasd_devices_entry->owner = THIS_MODULE;
323 dasd_statistics_entry = create_proc_entry("statistics",
324 S_IFREG | S_IRUGO | S_IWUSR,
325 dasd_proc_root_entry);
326 if (!dasd_statistics_entry)
327 goto out_nostatistics;
328 dasd_statistics_entry->read_proc = dasd_statistics_read;
329 dasd_statistics_entry->write_proc = dasd_statistics_write;
330 dasd_statistics_entry->owner = THIS_MODULE;
331 return 0;
332
333 out_nostatistics:
334 remove_proc_entry("devices", dasd_proc_root_entry);
335 out_nodevices:
336 remove_proc_entry("dasd", &proc_root);
337 out_nodasd:
338 return -ENOENT;
339 }
340
341 void
342 dasd_proc_exit(void)
343 {
344 remove_proc_entry("devices", dasd_proc_root_entry);
345 remove_proc_entry("statistics", dasd_proc_root_entry);
346 remove_proc_entry("dasd", &proc_root);
347 }
WRT350N Kernel Patches