[S390] dasd: Avoid compile warnings on !CONFIG_DASD_PROFILE
[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  */
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 }