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[PATCH] new toplevel target: headers_check_all
[wrt350n-kernel.git] / drivers / s390 / block / dasd_proc.c
blob8b3b0f4a157c09aaa23299a6cdbdfc8be2f1406f
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 static 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. */
79 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
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;
95 case DASD_STATE_UNFMT:
96 seq_printf(m, "unformatted");
97 break;
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 const 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 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 char *
171 dasd_statistics_array(char *str, unsigned 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
296 /*
297 * Create dasd proc-fs entries.
298 * In case creation failed, cleanup and return -ENOENT.
299 */
300 int
301 dasd_proc_init(void)
302 {
303 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
304 if (!dasd_proc_root_entry)
305 goto out_nodasd;
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);
310 if (!dasd_devices_entry)
311 goto out_nodevices;
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);
317 if (!dasd_statistics_entry)
318 goto out_nostatistics;
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;
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;
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 }
WRT350N Kernel Patches