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KVM: Move NMI IRET fault processing to new vmx_complete_interrupts()
[linux-2.6/linux-2.6-openrd.git] / drivers / s390 / block / dasd_proc.c
blob9088de84b45de867fd845478ac97b3b5c18bf543
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", dev_name(&device->cdev->dev));
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 MAJOR(disk_devt(block->gdp)),
80 MINOR(disk_devt(block->gdp)));
81 else
82 seq_printf(m, " at (???:??????)");
83 /* Print device name. */
84 if (block->gdp)
85 seq_printf(m, " is %-8s", block->gdp->disk_name);
86 else
87 seq_printf(m, " is ????????");
88 /* Print devices features. */
89 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
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;
105 case DASD_STATE_UNFMT:
106 seq_printf(m, "unformatted");
107 break;
108 case DASD_STATE_READY:
109 case DASD_STATE_ONLINE:
110 seq_printf(m, "active ");
111 if (dasd_check_blocksize(block->bp_block))
112 seq_printf(m, "n/f ");
113 else
114 seq_printf(m,
115 "at blocksize: %d, %ld blocks, %ld MB",
116 block->bp_block, block->blocks,
117 ((block->bp_block >> 9) *
118 block->blocks) >> 11);
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
148 static const struct seq_operations dasd_devices_seq_ops = {
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
160 static const struct file_operations dasd_devices_file_ops = {
161 .owner = THIS_MODULE,
162 .open = dasd_devices_open,
163 .read = seq_read,
164 .llseek = seq_lseek,
165 .release = seq_release,
166 };
167
168 static int
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
181 #ifdef CONFIG_DASD_PROFILE
182 static char *
183 dasd_statistics_array(char *str, unsigned int *array, int shift)
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 }
195 #endif /* CONFIG_DASD_PROFILE */
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
309 /*
310 * Create dasd proc-fs entries.
311 * In case creation failed, cleanup and return -ENOENT.
312 */
313 int
314 dasd_proc_init(void)
315 {
316 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
317 if (!dasd_proc_root_entry)
318 goto out_nodasd;
319 dasd_proc_root_entry->owner = THIS_MODULE;
320 dasd_devices_entry = proc_create("devices",
321 S_IFREG | S_IRUGO | S_IWUSR,
322 dasd_proc_root_entry,
323 &dasd_devices_file_ops);
324 if (!dasd_devices_entry)
325 goto out_nodevices;
326 dasd_statistics_entry = create_proc_entry("statistics",
327 S_IFREG | S_IRUGO | S_IWUSR,
328 dasd_proc_root_entry);
329 if (!dasd_statistics_entry)
330 goto out_nostatistics;
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;
335
336 out_nostatistics:
337 remove_proc_entry("devices", dasd_proc_root_entry);
338 out_nodevices:
339 remove_proc_entry("dasd", NULL);
340 out_nodasd:
341 return -ENOENT;
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);
349 remove_proc_entry("dasd", NULL);
350 }
linux 2.6 git repository for openrd