Pull sony into release branch
[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 static char *
32 dasd_get_user_string(const char __user *user_buf, size_t user_len)
33 {
34         char *buffer;
35
36         buffer = kmalloc(user_len + 1, GFP_KERNEL);
37         if (buffer == NULL)
38                 return ERR_PTR(-ENOMEM);
39         if (copy_from_user(buffer, user_buf, user_len) != 0) {
40                 kfree(buffer);
41                 return ERR_PTR(-EFAULT);
42         }
43         /* got the string, now strip linefeed. */
44         if (buffer[user_len - 1] == '\n')
45                 buffer[user_len - 1] = 0;
46         else
47                 buffer[user_len] = 0;
48         return buffer;
49 }
50
51 static int
52 dasd_devices_show(struct seq_file *m, void *v)
53 {
54         struct dasd_device *device;
55         char *substr;
56
57         device = dasd_device_from_devindex((unsigned long) v - 1);
58         if (IS_ERR(device))
59                 return 0;
60         /* Print device number. */
61         seq_printf(m, "%s", device->cdev->dev.bus_id);
62         /* Print discipline string. */
63         if (device != NULL && device->discipline != NULL)
64                 seq_printf(m, "(%s)", device->discipline->name);
65         else
66                 seq_printf(m, "(none)");
67         /* Print kdev. */
68         if (device->gdp)
69                 seq_printf(m, " at (%3d:%6d)",
70                            device->gdp->major, device->gdp->first_minor);
71         else
72                 seq_printf(m, "  at (???:??????)");
73         /* Print device name. */
74         if (device->gdp)
75                 seq_printf(m, " is %-8s", device->gdp->disk_name);
76         else
77                 seq_printf(m, " is ????????");
78         /* Print devices features. */
79         substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
80         seq_printf(m, "%4s: ", substr);
81         /* Print device status information. */
82         switch ((device != NULL) ? device->state : -1) {
83         case -1:
84                 seq_printf(m, "unknown");
85                 break;
86         case DASD_STATE_NEW:
87                 seq_printf(m, "new");
88                 break;
89         case DASD_STATE_KNOWN:
90                 seq_printf(m, "detected");
91                 break;
92         case DASD_STATE_BASIC:
93                 seq_printf(m, "basic");
94                 break;
95         case DASD_STATE_UNFMT:
96                 seq_printf(m, "unformatted");
97                 break;
98         case DASD_STATE_READY:
99         case DASD_STATE_ONLINE:
100                 seq_printf(m, "active ");
101                 if (dasd_check_blocksize(device->bp_block))
102                         seq_printf(m, "n/f       ");
103                 else
104                         seq_printf(m,
105                                    "at blocksize: %d, %ld blocks, %ld MB",
106                                    device->bp_block, device->blocks,
107                                    ((device->bp_block >> 9) *
108                                     device->blocks) >> 11);
109                 break;
110         default:
111                 seq_printf(m, "no stat");
112                 break;
113         }
114         dasd_put_device(device);
115         if (dasd_probeonly)
116                 seq_printf(m, "(probeonly)");
117         seq_printf(m, "\n");
118         return 0;
119 }
120
121 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
122 {
123         if (*pos >= dasd_max_devindex)
124                 return NULL;
125         return (void *)((unsigned long) *pos + 1);
126 }
127
128 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
129 {
130         ++*pos;
131         return dasd_devices_start(m, pos);
132 }
133
134 static void dasd_devices_stop(struct seq_file *m, void *v)
135 {
136 }
137
138 static struct seq_operations dasd_devices_seq_ops = {
139         .start          = dasd_devices_start,
140         .next           = dasd_devices_next,
141         .stop           = dasd_devices_stop,
142         .show           = dasd_devices_show,
143 };
144
145 static int dasd_devices_open(struct inode *inode, struct file *file)
146 {
147         return seq_open(file, &dasd_devices_seq_ops);
148 }
149
150 static const struct file_operations dasd_devices_file_ops = {
151         .open           = dasd_devices_open,
152         .read           = seq_read,
153         .llseek         = seq_lseek,
154         .release        = seq_release,
155 };
156
157 static int
158 dasd_calc_metrics(char *page, char **start, off_t off,
159                   int count, int *eof, int len)
160 {
161         len = (len > off) ? len - off : 0;
162         if (len > count)
163                 len = count;
164         if (len < count)
165                 *eof = 1;
166         *start = page + off;
167         return len;
168 }
169
170 static char *
171 dasd_statistics_array(char *str, unsigned int *array, int shift)
172 {
173         int i;
174
175         for (i = 0; i < 32; i++) {
176                 str += sprintf(str, "%7d ", array[i] >> shift);
177                 if (i == 15)
178                         str += sprintf(str, "\n");
179         }
180         str += sprintf(str,"\n");
181         return str;
182 }
183
184 static int
185 dasd_statistics_read(char *page, char **start, off_t off,
186                      int count, int *eof, void *data)
187 {
188         unsigned long len;
189 #ifdef CONFIG_DASD_PROFILE
190         struct dasd_profile_info_t *prof;
191         char *str;
192         int shift;
193
194         /* check for active profiling */
195         if (dasd_profile_level == DASD_PROFILE_OFF) {
196                 len = sprintf(page, "Statistics are off - they might be "
197                                     "switched on using 'echo set on > "
198                                     "/proc/dasd/statistics'\n");
199                 return dasd_calc_metrics(page, start, off, count, eof, len);
200         }
201
202         prof = &dasd_global_profile;
203         /* prevent couter 'overflow' on output */
204         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
205
206         str = page;
207         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
208         str += sprintf(str, "with %d sectors(512B each)\n",
209                        prof->dasd_io_sects);
210         str += sprintf(str,
211                        "   __<4    ___8    __16    __32    __64    _128 "
212                        "   _256    _512    __1k    __2k    __4k    __8k "
213                        "   _16k    _32k    _64k    128k\n");
214         str += sprintf(str,
215                        "   _256    _512    __1M    __2M    __4M    __8M "
216                        "   _16M    _32M    _64M    128M    256M    512M "
217                        "   __1G    __2G    __4G " "   _>4G\n");
218
219         str += sprintf(str, "Histogram of sizes (512B secs)\n");
220         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
221         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
222         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
223         str += sprintf(str, "Histogram of I/O times per sector\n");
224         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
225         str += sprintf(str, "Histogram of I/O time till ssch\n");
226         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
227         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
228         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
229         str += sprintf(str, "Histogram of I/O time between ssch "
230                             "and irq per sector\n");
231         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
232         str += sprintf(str, "Histogram of I/O time between irq and end\n");
233         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
234         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
235         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
236         len = str - page;
237 #else
238         len = sprintf(page, "Statistics are not activated in this kernel\n");
239 #endif
240         return dasd_calc_metrics(page, start, off, count, eof, len);
241 }
242
243 static int
244 dasd_statistics_write(struct file *file, const char __user *user_buf,
245                       unsigned long user_len, void *data)
246 {
247 #ifdef CONFIG_DASD_PROFILE
248         char *buffer, *str;
249
250         if (user_len > 65536)
251                 user_len = 65536;
252         buffer = dasd_get_user_string(user_buf, user_len);
253         if (IS_ERR(buffer))
254                 return PTR_ERR(buffer);
255         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
256
257         /* check for valid verbs */
258         for (str = buffer; isspace(*str); str++);
259         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
260                 /* 'set xxx' was given */
261                 for (str = str + 4; isspace(*str); str++);
262                 if (strcmp(str, "on") == 0) {
263                         /* switch on statistics profiling */
264                         dasd_profile_level = DASD_PROFILE_ON;
265                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
266                 } else if (strcmp(str, "off") == 0) {
267                         /* switch off and reset statistics profiling */
268                         memset(&dasd_global_profile,
269                                0, sizeof (struct dasd_profile_info_t));
270                         dasd_profile_level = DASD_PROFILE_OFF;
271                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
272                 } else
273                         goto out_error;
274         } else if (strncmp(str, "reset", 5) == 0) {
275                 /* reset the statistics */
276                 memset(&dasd_global_profile, 0,
277                        sizeof (struct dasd_profile_info_t));
278                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
279         } else
280                 goto out_error;
281         kfree(buffer);
282         return user_len;
283 out_error:
284         MESSAGE(KERN_WARNING, "%s",
285                 "/proc/dasd/statistics: only 'set on', 'set off' "
286                 "and 'reset' are supported verbs");
287         kfree(buffer);
288         return -EINVAL;
289 #else
290         MESSAGE(KERN_WARNING, "%s",
291                 "/proc/dasd/statistics: is not activated in this kernel");
292         return user_len;
293 #endif                          /* CONFIG_DASD_PROFILE */
294 }
295
296 /*
297  * Create dasd proc-fs entries.
298  * In case creation failed, cleanup and return -ENOENT.
299  */
300 int
301 dasd_proc_init(void)
302 {
303         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
304         if (!dasd_proc_root_entry)
305                 goto out_nodasd;
306         dasd_proc_root_entry->owner = THIS_MODULE;
307         dasd_devices_entry = create_proc_entry("devices",
308                                                S_IFREG | S_IRUGO | S_IWUSR,
309                                                dasd_proc_root_entry);
310         if (!dasd_devices_entry)
311                 goto out_nodevices;
312         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
313         dasd_devices_entry->owner = THIS_MODULE;
314         dasd_statistics_entry = create_proc_entry("statistics",
315                                                   S_IFREG | S_IRUGO | S_IWUSR,
316                                                   dasd_proc_root_entry);
317         if (!dasd_statistics_entry)
318                 goto out_nostatistics;
319         dasd_statistics_entry->read_proc = dasd_statistics_read;
320         dasd_statistics_entry->write_proc = dasd_statistics_write;
321         dasd_statistics_entry->owner = THIS_MODULE;
322         return 0;
323
324  out_nostatistics:
325         remove_proc_entry("devices", dasd_proc_root_entry);
326  out_nodevices:
327         remove_proc_entry("dasd", &proc_root);
328  out_nodasd:
329         return -ENOENT;
330 }
331
332 void
333 dasd_proc_exit(void)
334 {
335         remove_proc_entry("devices", dasd_proc_root_entry);
336         remove_proc_entry("statistics", dasd_proc_root_entry);
337         remove_proc_entry("dasd", &proc_root);
338 }