Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/dtor/input.git manually
[linux-2.6] / drivers / s390 / block / dasd_proc.c
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  * $Revision: 1.32 $
13  */
14
15 #include <linux/config.h>
16 #include <linux/ctype.h>
17 #include <linux/seq_file.h>
18 #include <linux/vmalloc.h>
19 #include <linux/proc_fs.h>
20
21 #include <asm/debug.h>
22 #include <asm/uaccess.h>
23
24 /* This is ugly... */
25 #define PRINTK_HEADER "dasd_proc:"
26
27 #include "dasd_int.h"
28
29 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
30 static struct proc_dir_entry *dasd_devices_entry = NULL;
31 static struct proc_dir_entry *dasd_statistics_entry = NULL;
32
33 static inline char *
34 dasd_get_user_string(const char __user *user_buf, size_t user_len)
35 {
36         char *buffer;
37
38         buffer = kmalloc(user_len + 1, GFP_KERNEL);
39         if (buffer == NULL)
40                 return ERR_PTR(-ENOMEM);
41         if (copy_from_user(buffer, user_buf, user_len) != 0) {
42                 kfree(buffer);
43                 return ERR_PTR(-EFAULT);
44         }
45         /* got the string, now strip linefeed. */
46         if (buffer[user_len - 1] == '\n')
47                 buffer[user_len - 1] = 0;
48         else
49                 buffer[user_len] = 0;
50         return buffer;
51 }
52
53 static int
54 dasd_devices_show(struct seq_file *m, void *v)
55 {
56         struct dasd_device *device;
57         char *substr;
58         int feature;
59
60         device = dasd_device_from_devindex((unsigned long) v - 1);
61         if (IS_ERR(device))
62                 return 0;
63         /* Print device number. */
64         seq_printf(m, "%s", device->cdev->dev.bus_id);
65         /* Print discipline string. */
66         if (device != NULL && device->discipline != NULL)
67                 seq_printf(m, "(%s)", device->discipline->name);
68         else
69                 seq_printf(m, "(none)");
70         /* Print kdev. */
71         if (device->gdp)
72                 seq_printf(m, " at (%3d:%6d)",
73                            device->gdp->major, device->gdp->first_minor);
74         else
75                 seq_printf(m, "  at (???:??????)");
76         /* Print device name. */
77         if (device->gdp)
78                 seq_printf(m, " is %-8s", device->gdp->disk_name);
79         else
80                 seq_printf(m, " is ????????");
81         /* Print devices features. */
82         feature = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
83         if (feature < 0)
84                 return 0;
85         substr = feature ? "(ro)" : " ";
86         seq_printf(m, "%4s: ", substr);
87         /* Print device status information. */
88         switch ((device != NULL) ? device->state : -1) {
89         case -1:
90                 seq_printf(m, "unknown");
91                 break;
92         case DASD_STATE_NEW:
93                 seq_printf(m, "new");
94                 break;
95         case DASD_STATE_KNOWN:
96                 seq_printf(m, "detected");
97                 break;
98         case DASD_STATE_BASIC:
99                 seq_printf(m, "basic");
100                 break;
101         case DASD_STATE_READY:
102         case DASD_STATE_ONLINE:
103                 seq_printf(m, "active ");
104                 if (dasd_check_blocksize(device->bp_block))
105                         seq_printf(m, "n/f       ");
106                 else
107                         seq_printf(m,
108                                    "at blocksize: %d, %ld blocks, %ld MB",
109                                    device->bp_block, device->blocks,
110                                    ((device->bp_block >> 9) *
111                                     device->blocks) >> 11);
112                 break;
113         default:
114                 seq_printf(m, "no stat");
115                 break;
116         }
117         dasd_put_device(device);
118         if (dasd_probeonly)
119                 seq_printf(m, "(probeonly)");
120         seq_printf(m, "\n");
121         return 0;
122 }
123
124 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
125 {
126         if (*pos >= dasd_max_devindex)
127                 return NULL;
128         return (void *)((unsigned long) *pos + 1);
129 }
130
131 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
132 {
133         ++*pos;
134         return dasd_devices_start(m, pos);
135 }
136
137 static void dasd_devices_stop(struct seq_file *m, void *v)
138 {
139 }
140
141 static struct seq_operations dasd_devices_seq_ops = {
142         .start          = dasd_devices_start,
143         .next           = dasd_devices_next,
144         .stop           = dasd_devices_stop,
145         .show           = dasd_devices_show,
146 };
147
148 static int dasd_devices_open(struct inode *inode, struct file *file)
149 {
150         return seq_open(file, &dasd_devices_seq_ops);
151 }
152
153 static struct file_operations dasd_devices_file_ops = {
154         .open           = dasd_devices_open,
155         .read           = seq_read,
156         .llseek         = seq_lseek,
157         .release        = seq_release,
158 };
159
160 static inline int
161 dasd_calc_metrics(char *page, char **start, off_t off,
162                   int count, int *eof, int len)
163 {
164         len = (len > off) ? len - off : 0;
165         if (len > count)
166                 len = count;
167         if (len < count)
168                 *eof = 1;
169         *start = page + off;
170         return len;
171 }
172
173 static inline char *
174 dasd_statistics_array(char *str, 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
187 static int
188 dasd_statistics_read(char *page, char **start, off_t off,
189                      int count, int *eof, void *data)
190 {
191         unsigned long len;
192 #ifdef CONFIG_DASD_PROFILE
193         struct dasd_profile_info_t *prof;
194         char *str;
195         int shift;
196
197         /* check for active profiling */
198         if (dasd_profile_level == DASD_PROFILE_OFF) {
199                 len = sprintf(page, "Statistics are off - they might be "
200                                     "switched on using 'echo set on > "
201                                     "/proc/dasd/statistics'\n");
202                 return dasd_calc_metrics(page, start, off, count, eof, len);
203         }
204
205         prof = &dasd_global_profile;
206         /* prevent couter 'overflow' on output */
207         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
208
209         str = page;
210         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
211         str += sprintf(str, "with %d sectors(512B each)\n",
212                        prof->dasd_io_sects);
213         str += sprintf(str,
214                        "   __<4    ___8    __16    __32    __64    _128 "
215                        "   _256    _512    __1k    __2k    __4k    __8k "
216                        "   _16k    _32k    _64k    128k\n");
217         str += sprintf(str,
218                        "   _256    _512    __1M    __2M    __4M    __8M "
219                        "   _16M    _32M    _64M    128M    256M    512M "
220                        "   __1G    __2G    __4G " "   _>4G\n");
221
222         str += sprintf(str, "Histogram of sizes (512B secs)\n");
223         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
224         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
225         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
226         str += sprintf(str, "Histogram of I/O times per sector\n");
227         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
228         str += sprintf(str, "Histogram of I/O time till ssch\n");
229         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
230         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
231         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
232         str += sprintf(str, "Histogram of I/O time between ssch "
233                             "and irq per sector\n");
234         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
235         str += sprintf(str, "Histogram of I/O time between irq and end\n");
236         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
237         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
238         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
239         len = str - page;
240 #else
241         len = sprintf(page, "Statistics are not activated in this kernel\n");
242 #endif
243         return dasd_calc_metrics(page, start, off, count, eof, len);
244 }
245
246 static int
247 dasd_statistics_write(struct file *file, const char __user *user_buf,
248                       unsigned long user_len, void *data)
249 {
250 #ifdef CONFIG_DASD_PROFILE
251         char *buffer, *str;
252
253         if (user_len > 65536)
254                 user_len = 65536;
255         buffer = dasd_get_user_string(user_buf, user_len);
256         if (IS_ERR(buffer))
257                 return PTR_ERR(buffer);
258         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
259
260         /* check for valid verbs */
261         for (str = buffer; isspace(*str); str++);
262         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
263                 /* 'set xxx' was given */
264                 for (str = str + 4; isspace(*str); str++);
265                 if (strcmp(str, "on") == 0) {
266                         /* switch on statistics profiling */
267                         dasd_profile_level = DASD_PROFILE_ON;
268                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
269                 } else if (strcmp(str, "off") == 0) {
270                         /* switch off and reset statistics profiling */
271                         memset(&dasd_global_profile,
272                                0, sizeof (struct dasd_profile_info_t));
273                         dasd_profile_level = DASD_PROFILE_OFF;
274                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
275                 } else
276                         goto out_error;
277         } else if (strncmp(str, "reset", 5) == 0) {
278                 /* reset the statistics */
279                 memset(&dasd_global_profile, 0,
280                        sizeof (struct dasd_profile_info_t));
281                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
282         } else
283                 goto out_error;
284         kfree(buffer);
285         return user_len;
286 out_error:
287         MESSAGE(KERN_WARNING, "%s",
288                 "/proc/dasd/statistics: only 'set on', 'set off' "
289                 "and 'reset' are supported verbs");
290         kfree(buffer);
291         return -EINVAL;
292 #else
293         MESSAGE(KERN_WARNING, "%s",
294                 "/proc/dasd/statistics: is not activated in this kernel");
295         return user_len;
296 #endif                          /* CONFIG_DASD_PROFILE */
297 }
298
299 int
300 dasd_proc_init(void)
301 {
302         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
303         dasd_proc_root_entry->owner = THIS_MODULE;
304         dasd_devices_entry = create_proc_entry("devices",
305                                                S_IFREG | S_IRUGO | S_IWUSR,
306                                                dasd_proc_root_entry);
307         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
308         dasd_devices_entry->owner = THIS_MODULE;
309         dasd_statistics_entry = create_proc_entry("statistics",
310                                                   S_IFREG | S_IRUGO | S_IWUSR,
311                                                   dasd_proc_root_entry);
312         dasd_statistics_entry->read_proc = dasd_statistics_read;
313         dasd_statistics_entry->write_proc = dasd_statistics_write;
314         dasd_statistics_entry->owner = THIS_MODULE;
315         return 0;
316 }
317
318 void
319 dasd_proc_exit(void)
320 {
321         remove_proc_entry("devices", dasd_proc_root_entry);
322         remove_proc_entry("statistics", dasd_proc_root_entry);
323         remove_proc_entry("dasd", &proc_root);
324 }