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pnpacpi: print resource shortage message only once (more)
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / s390 / block / dasd_proc.c
blobac7e8ef504cb98f5ae6d0c0d40efa3ac54059f75
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 char *substr;
58
59 device = dasd_device_from_devindex((unsigned long) v - 1);
60 if (IS_ERR(device))
61 return 0;
62 /* Print device number. */
63 seq_printf(m, "%s", device->cdev->dev.bus_id);
64 /* Print discipline string. */
65 if (device != NULL && device->discipline != NULL)
66 seq_printf(m, "(%s)", device->discipline->name);
67 else
68 seq_printf(m, "(none)");
69 /* Print kdev. */
70 if (device->gdp)
71 seq_printf(m, " at (%3d:%6d)",
72 device->gdp->major, device->gdp->first_minor);
73 else
74 seq_printf(m, " at (???:??????)");
75 /* Print device name. */
76 if (device->gdp)
77 seq_printf(m, " is %-8s", device->gdp->disk_name);
78 else
79 seq_printf(m, " is ????????");
80 /* Print devices features. */
81 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
82 seq_printf(m, "%4s: ", substr);
83 /* Print device status information. */
84 switch ((device != NULL) ? device->state : -1) {
85 case -1:
86 seq_printf(m, "unknown");
87 break;
88 case DASD_STATE_NEW:
89 seq_printf(m, "new");
90 break;
91 case DASD_STATE_KNOWN:
92 seq_printf(m, "detected");
93 break;
94 case DASD_STATE_BASIC:
95 seq_printf(m, "basic");
96 break;
97 case DASD_STATE_UNFMT:
98 seq_printf(m, "unformatted");
99 break;
100 case DASD_STATE_READY:
101 case DASD_STATE_ONLINE:
102 seq_printf(m, "active ");
103 if (dasd_check_blocksize(device->bp_block))
104 seq_printf(m, "n/f ");
105 else
106 seq_printf(m,
107 "at blocksize: %d, %ld blocks, %ld MB",
108 device->bp_block, device->blocks,
109 ((device->bp_block >> 9) *
110 device->blocks) >> 11);
111 break;
112 default:
113 seq_printf(m, "no stat");
114 break;
115 }
116 dasd_put_device(device);
117 if (dasd_probeonly)
118 seq_printf(m, "(probeonly)");
119 seq_printf(m, "\n");
120 return 0;
121 }
122
123 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
124 {
125 if (*pos >= dasd_max_devindex)
126 return NULL;
127 return (void *)((unsigned long) *pos + 1);
128 }
129
130 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
131 {
132 ++*pos;
133 return dasd_devices_start(m, pos);
134 }
135
136 static void dasd_devices_stop(struct seq_file *m, void *v)
137 {
138 }
139
140 static struct seq_operations dasd_devices_seq_ops = {
141 .start = dasd_devices_start,
142 .next = dasd_devices_next,
143 .stop = dasd_devices_stop,
144 .show = dasd_devices_show,
145 };
146
147 static int dasd_devices_open(struct inode *inode, struct file *file)
148 {
149 return seq_open(file, &dasd_devices_seq_ops);
150 }
151
152 static const struct file_operations dasd_devices_file_ops = {
153 .open = dasd_devices_open,
154 .read = seq_read,
155 .llseek = seq_lseek,
156 .release = seq_release,
157 };
158
159 static int
160 dasd_calc_metrics(char *page, char **start, off_t off,
161 int count, int *eof, int len)
162 {
163 len = (len > off) ? len - off : 0;
164 if (len > count)
165 len = count;
166 if (len < count)
167 *eof = 1;
168 *start = page + off;
169 return len;
170 }
171
172 #ifdef CONFIG_DASD_PROFILE
173 static char *
174 dasd_statistics_array(char *str, unsigned int *array, int shift)
175 {
176 int i;
177
178 for (i = 0; i < 32; i++) {
179 str += sprintf(str, "%7d ", array[i] >> shift);
180 if (i == 15)
181 str += sprintf(str, "\n");
182 }
183 str += sprintf(str,"\n");
184 return str;
185 }
186 #endif /* CONFIG_DASD_PROFILE */
187
188 static int
189 dasd_statistics_read(char *page, char **start, off_t off,
190 int count, int *eof, void *data)
191 {
192 unsigned long len;
193 #ifdef CONFIG_DASD_PROFILE
194 struct dasd_profile_info_t *prof;
195 char *str;
196 int shift;
197
198 /* check for active profiling */
199 if (dasd_profile_level == DASD_PROFILE_OFF) {
200 len = sprintf(page, "Statistics are off - they might be "
201 "switched on using 'echo set on > "
202 "/proc/dasd/statistics'\n");
203 return dasd_calc_metrics(page, start, off, count, eof, len);
204 }
205
206 prof = &dasd_global_profile;
207 /* prevent couter 'overflow' on output */
208 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
209
210 str = page;
211 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
212 str += sprintf(str, "with %d sectors(512B each)\n",
213 prof->dasd_io_sects);
214 str += sprintf(str,
215 " __<4 ___8 __16 __32 __64 _128 "
216 " _256 _512 __1k __2k __4k __8k "
217 " _16k _32k _64k 128k\n");
218 str += sprintf(str,
219 " _256 _512 __1M __2M __4M __8M "
220 " _16M _32M _64M 128M 256M 512M "
221 " __1G __2G __4G " " _>4G\n");
222
223 str += sprintf(str, "Histogram of sizes (512B secs)\n");
224 str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
225 str += sprintf(str, "Histogram of I/O times (microseconds)\n");
226 str = dasd_statistics_array(str, prof->dasd_io_times, shift);
227 str += sprintf(str, "Histogram of I/O times per sector\n");
228 str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
229 str += sprintf(str, "Histogram of I/O time till ssch\n");
230 str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
231 str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
232 str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
233 str += sprintf(str, "Histogram of I/O time between ssch "
234 "and irq per sector\n");
235 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
236 str += sprintf(str, "Histogram of I/O time between irq and end\n");
237 str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
238 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
239 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
240 len = str - page;
241 #else
242 len = sprintf(page, "Statistics are not activated in this kernel\n");
243 #endif
244 return dasd_calc_metrics(page, start, off, count, eof, len);
245 }
246
247 static int
248 dasd_statistics_write(struct file *file, const char __user *user_buf,
249 unsigned long user_len, void *data)
250 {
251 #ifdef CONFIG_DASD_PROFILE
252 char *buffer, *str;
253
254 if (user_len > 65536)
255 user_len = 65536;
256 buffer = dasd_get_user_string(user_buf, user_len);
257 if (IS_ERR(buffer))
258 return PTR_ERR(buffer);
259 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
260
261 /* check for valid verbs */
262 for (str = buffer; isspace(*str); str++);
263 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
264 /* 'set xxx' was given */
265 for (str = str + 4; isspace(*str); str++);
266 if (strcmp(str, "on") == 0) {
267 /* switch on statistics profiling */
268 dasd_profile_level = DASD_PROFILE_ON;
269 MESSAGE(KERN_INFO, "%s", "Statistics switched on");
270 } else if (strcmp(str, "off") == 0) {
271 /* switch off and reset statistics profiling */
272 memset(&dasd_global_profile,
273 0, sizeof (struct dasd_profile_info_t));
274 dasd_profile_level = DASD_PROFILE_OFF;
275 MESSAGE(KERN_INFO, "%s", "Statistics switched off");
276 } else
277 goto out_error;
278 } else if (strncmp(str, "reset", 5) == 0) {
279 /* reset the statistics */
280 memset(&dasd_global_profile, 0,
281 sizeof (struct dasd_profile_info_t));
282 MESSAGE(KERN_INFO, "%s", "Statistics reset");
283 } else
284 goto out_error;
285 kfree(buffer);
286 return user_len;
287 out_error:
288 MESSAGE(KERN_WARNING, "%s",
289 "/proc/dasd/statistics: only 'set on', 'set off' "
290 "and 'reset' are supported verbs");
291 kfree(buffer);
292 return -EINVAL;
293 #else
294 MESSAGE(KERN_WARNING, "%s",
295 "/proc/dasd/statistics: is not activated in this kernel");
296 return user_len;
297 #endif /* CONFIG_DASD_PROFILE */
298 }
299
300 /*
301 * Create dasd proc-fs entries.
302 * In case creation failed, cleanup and return -ENOENT.
303 */
304 int
305 dasd_proc_init(void)
306 {
307 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
308 if (!dasd_proc_root_entry)
309 goto out_nodasd;
310 dasd_proc_root_entry->owner = THIS_MODULE;
311 dasd_devices_entry = create_proc_entry("devices",
312 S_IFREG | S_IRUGO | S_IWUSR,
313 dasd_proc_root_entry);
314 if (!dasd_devices_entry)
315 goto out_nodevices;
316 dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
317 dasd_devices_entry->owner = THIS_MODULE;
318 dasd_statistics_entry = create_proc_entry("statistics",
319 S_IFREG | S_IRUGO | S_IWUSR,
320 dasd_proc_root_entry);
321 if (!dasd_statistics_entry)
322 goto out_nostatistics;
323 dasd_statistics_entry->read_proc = dasd_statistics_read;
324 dasd_statistics_entry->write_proc = dasd_statistics_write;
325 dasd_statistics_entry->owner = THIS_MODULE;
326 return 0;
327
328 out_nostatistics:
329 remove_proc_entry("devices", dasd_proc_root_entry);
330 out_nodevices:
331 remove_proc_entry("dasd", &proc_root);
332 out_nodasd:
333 return -ENOENT;
334 }
335
336 void
337 dasd_proc_exit(void)
338 {
339 remove_proc_entry("devices", dasd_proc_root_entry);
340 remove_proc_entry("statistics", dasd_proc_root_entry);
341 remove_proc_entry("dasd", &proc_root);
342 }
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