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slub page alloc fallback: Enable interrupts for GFP_WAIT.
[wrt350n-kernel.git] / drivers / s390 / block / dasd_proc.c
blob556063e8f7a91d1163450cc63d1cd9128e6a77b4
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 dasd_put_device(device);
67 return 0;
68 }
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. */
77 if (block->gdp)
78 seq_printf(m, " at (%3d:%6d)",
79 block->gdp->major, block->gdp->first_minor);
80 else
81 seq_printf(m, " at (???:??????)");
82 /* Print device name. */
83 if (block->gdp)
84 seq_printf(m, " is %-8s", block->gdp->disk_name);
85 else
86 seq_printf(m, " is ????????");
87 /* Print devices features. */
88 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
89 seq_printf(m, "%4s: ", substr);
90 /* Print device status information. */
91 switch ((device != NULL) ? device->state : -1) {
92 case -1:
93 seq_printf(m, "unknown");
94 break;
95 case DASD_STATE_NEW:
96 seq_printf(m, "new");
97 break;
98 case DASD_STATE_KNOWN:
99 seq_printf(m, "detected");
100 break;
101 case DASD_STATE_BASIC:
102 seq_printf(m, "basic");
103 break;
104 case DASD_STATE_UNFMT:
105 seq_printf(m, "unformatted");
106 break;
107 case DASD_STATE_READY:
108 case DASD_STATE_ONLINE:
109 seq_printf(m, "active ");
110 if (dasd_check_blocksize(block->bp_block))
111 seq_printf(m, "n/f ");
112 else
113 seq_printf(m,
114 "at blocksize: %d, %ld blocks, %ld MB",
115 block->bp_block, block->blocks,
116 ((block->bp_block >> 9) *
117 block->blocks) >> 11);
118 break;
119 default:
120 seq_printf(m, "no stat");
121 break;
122 }
123 dasd_put_device(device);
124 if (dasd_probeonly)
125 seq_printf(m, "(probeonly)");
126 seq_printf(m, "\n");
127 return 0;
128 }
129
130 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
131 {
132 if (*pos >= dasd_max_devindex)
133 return NULL;
134 return (void *)((unsigned long) *pos + 1);
135 }
136
137 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
138 {
139 ++*pos;
140 return dasd_devices_start(m, pos);
141 }
142
143 static void dasd_devices_stop(struct seq_file *m, void *v)
144 {
145 }
146
147 static const struct seq_operations dasd_devices_seq_ops = {
148 .start = dasd_devices_start,
149 .next = dasd_devices_next,
150 .stop = dasd_devices_stop,
151 .show = dasd_devices_show,
152 };
153
154 static int dasd_devices_open(struct inode *inode, struct file *file)
155 {
156 return seq_open(file, &dasd_devices_seq_ops);
157 }
158
159 static const struct file_operations dasd_devices_file_ops = {
160 .open = dasd_devices_open,
161 .read = seq_read,
162 .llseek = seq_lseek,
163 .release = seq_release,
164 };
165
166 static int
167 dasd_calc_metrics(char *page, char **start, off_t off,
168 int count, int *eof, int len)
169 {
170 len = (len > off) ? len - off : 0;
171 if (len > count)
172 len = count;
173 if (len < count)
174 *eof = 1;
175 *start = page + off;
176 return len;
177 }
178
179 #ifdef CONFIG_DASD_PROFILE
180 static char *
181 dasd_statistics_array(char *str, unsigned int *array, int shift)
182 {
183 int i;
184
185 for (i = 0; i < 32; i++) {
186 str += sprintf(str, "%7d ", array[i] >> shift);
187 if (i == 15)
188 str += sprintf(str, "\n");
189 }
190 str += sprintf(str,"\n");
191 return str;
192 }
193 #endif /* CONFIG_DASD_PROFILE */
194
195 static int
196 dasd_statistics_read(char *page, char **start, off_t off,
197 int count, int *eof, void *data)
198 {
199 unsigned long len;
200 #ifdef CONFIG_DASD_PROFILE
201 struct dasd_profile_info_t *prof;
202 char *str;
203 int shift;
204
205 /* check for active profiling */
206 if (dasd_profile_level == DASD_PROFILE_OFF) {
207 len = sprintf(page, "Statistics are off - they might be "
208 "switched on using 'echo set on > "
209 "/proc/dasd/statistics'\n");
210 return dasd_calc_metrics(page, start, off, count, eof, len);
211 }
212
213 prof = &dasd_global_profile;
214 /* prevent couter 'overflow' on output */
215 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
216
217 str = page;
218 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
219 str += sprintf(str, "with %d sectors(512B each)\n",
220 prof->dasd_io_sects);
221 str += sprintf(str,
222 " __<4 ___8 __16 __32 __64 _128 "
223 " _256 _512 __1k __2k __4k __8k "
224 " _16k _32k _64k 128k\n");
225 str += sprintf(str,
226 " _256 _512 __1M __2M __4M __8M "
227 " _16M _32M _64M 128M 256M 512M "
228 " __1G __2G __4G " " _>4G\n");
229
230 str += sprintf(str, "Histogram of sizes (512B secs)\n");
231 str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
232 str += sprintf(str, "Histogram of I/O times (microseconds)\n");
233 str = dasd_statistics_array(str, prof->dasd_io_times, shift);
234 str += sprintf(str, "Histogram of I/O times per sector\n");
235 str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
236 str += sprintf(str, "Histogram of I/O time till ssch\n");
237 str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
238 str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
239 str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
240 str += sprintf(str, "Histogram of I/O time between ssch "
241 "and irq per sector\n");
242 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
243 str += sprintf(str, "Histogram of I/O time between irq and end\n");
244 str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
245 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
246 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
247 len = str - page;
248 #else
249 len = sprintf(page, "Statistics are not activated in this kernel\n");
250 #endif
251 return dasd_calc_metrics(page, start, off, count, eof, len);
252 }
253
254 static int
255 dasd_statistics_write(struct file *file, const char __user *user_buf,
256 unsigned long user_len, void *data)
257 {
258 #ifdef CONFIG_DASD_PROFILE
259 char *buffer, *str;
260
261 if (user_len > 65536)
262 user_len = 65536;
263 buffer = dasd_get_user_string(user_buf, user_len);
264 if (IS_ERR(buffer))
265 return PTR_ERR(buffer);
266 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
267
268 /* check for valid verbs */
269 for (str = buffer; isspace(*str); str++);
270 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
271 /* 'set xxx' was given */
272 for (str = str + 4; isspace(*str); str++);
273 if (strcmp(str, "on") == 0) {
274 /* switch on statistics profiling */
275 dasd_profile_level = DASD_PROFILE_ON;
276 MESSAGE(KERN_INFO, "%s", "Statistics switched on");
277 } else if (strcmp(str, "off") == 0) {
278 /* switch off and reset statistics profiling */
279 memset(&dasd_global_profile,
280 0, sizeof (struct dasd_profile_info_t));
281 dasd_profile_level = DASD_PROFILE_OFF;
282 MESSAGE(KERN_INFO, "%s", "Statistics switched off");
283 } else
284 goto out_error;
285 } else if (strncmp(str, "reset", 5) == 0) {
286 /* reset the statistics */
287 memset(&dasd_global_profile, 0,
288 sizeof (struct dasd_profile_info_t));
289 MESSAGE(KERN_INFO, "%s", "Statistics reset");
290 } else
291 goto out_error;
292 kfree(buffer);
293 return user_len;
294 out_error:
295 MESSAGE(KERN_WARNING, "%s",
296 "/proc/dasd/statistics: only 'set on', 'set off' "
297 "and 'reset' are supported verbs");
298 kfree(buffer);
299 return -EINVAL;
300 #else
301 MESSAGE(KERN_WARNING, "%s",
302 "/proc/dasd/statistics: is not activated in this kernel");
303 return user_len;
304 #endif /* CONFIG_DASD_PROFILE */
305 }
306
307 /*
308 * Create dasd proc-fs entries.
309 * In case creation failed, cleanup and return -ENOENT.
310 */
311 int
312 dasd_proc_init(void)
313 {
314 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
315 if (!dasd_proc_root_entry)
316 goto out_nodasd;
317 dasd_proc_root_entry->owner = THIS_MODULE;
318 dasd_devices_entry = create_proc_entry("devices",
319 S_IFREG | S_IRUGO | S_IWUSR,
320 dasd_proc_root_entry);
321 if (!dasd_devices_entry)
322 goto out_nodevices;
323 dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
324 dasd_devices_entry->owner = THIS_MODULE;
325 dasd_statistics_entry = create_proc_entry("statistics",
326 S_IFREG | S_IRUGO | S_IWUSR,
327 dasd_proc_root_entry);
328 if (!dasd_statistics_entry)
329 goto out_nostatistics;
330 dasd_statistics_entry->read_proc = dasd_statistics_read;
331 dasd_statistics_entry->write_proc = dasd_statistics_write;
332 dasd_statistics_entry->owner = THIS_MODULE;
333 return 0;
334
335 out_nostatistics:
336 remove_proc_entry("devices", dasd_proc_root_entry);
337 out_nodevices:
338 remove_proc_entry("dasd", &proc_root);
339 out_nodasd:
340 return -ENOENT;
341 }
342
343 void
344 dasd_proc_exit(void)
345 {
346 remove_proc_entry("devices", dasd_proc_root_entry);
347 remove_proc_entry("statistics", dasd_proc_root_entry);
348 remove_proc_entry("dasd", &proc_root);
349 }
WRT350N Kernel Patches