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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / s390 / block / dasd_proc.c
blobf13a0bdd148cae363315ef7d6f1ad895554e0568
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 #define KMSG_COMPONENT "dasd"
15
16 #include <linux/ctype.h>
17 #include <linux/string.h>
18 #include <linux/seq_file.h>
19 #include <linux/vmalloc.h>
20 #include <linux/proc_fs.h>
21
22 #include <asm/debug.h>
23 #include <asm/uaccess.h>
24
25 /* This is ugly... */
26 #define PRINTK_HEADER "dasd_proc:"
27
28 #include "dasd_int.h"
29
30 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
31 static struct proc_dir_entry *dasd_devices_entry = NULL;
32 static struct proc_dir_entry *dasd_statistics_entry = NULL;
33
34 #ifdef CONFIG_DASD_PROFILE
35 static char *
36 dasd_get_user_string(const char __user *user_buf, size_t user_len)
37 {
38 char *buffer;
39
40 buffer = kmalloc(user_len + 1, GFP_KERNEL);
41 if (buffer == NULL)
42 return ERR_PTR(-ENOMEM);
43 if (copy_from_user(buffer, user_buf, user_len) != 0) {
44 kfree(buffer);
45 return ERR_PTR(-EFAULT);
46 }
47 /* got the string, now strip linefeed. */
48 if (buffer[user_len - 1] == '\n')
49 buffer[user_len - 1] = 0;
50 else
51 buffer[user_len] = 0;
52 return buffer;
53 }
54 #endif /* CONFIG_DASD_PROFILE */
55
56 static int
57 dasd_devices_show(struct seq_file *m, void *v)
58 {
59 struct dasd_device *device;
60 struct dasd_block *block;
61 char *substr;
62
63 device = dasd_device_from_devindex((unsigned long) v - 1);
64 if (IS_ERR(device))
65 return 0;
66 if (device->block)
67 block = device->block;
68 else {
69 dasd_put_device(device);
70 return 0;
71 }
72 /* Print device number. */
73 seq_printf(m, "%s", dev_name(&device->cdev->dev));
74 /* Print discipline string. */
75 if (device->discipline != NULL)
76 seq_printf(m, "(%s)", device->discipline->name);
77 else
78 seq_printf(m, "(none)");
79 /* Print kdev. */
80 if (block->gdp)
81 seq_printf(m, " at (%3d:%6d)",
82 MAJOR(disk_devt(block->gdp)),
83 MINOR(disk_devt(block->gdp)));
84 else
85 seq_printf(m, " at (???:??????)");
86 /* Print device name. */
87 if (block->gdp)
88 seq_printf(m, " is %-8s", block->gdp->disk_name);
89 else
90 seq_printf(m, " is ????????");
91 /* Print devices features. */
92 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
93 seq_printf(m, "%4s: ", substr);
94 /* Print device status information. */
95 switch (device->state) {
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, %lld blocks, %lld 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 #ifdef CONFIG_DASD_PROFILE
169 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
170 {
171 int i;
172
173 for (i = 0; i < 32; i++) {
174 seq_printf(m, "%7d ", array[i] / factor);
175 if (i == 15)
176 seq_putc(m, '\n');
177 }
178 seq_putc(m, '\n');
179 }
180 #endif /* CONFIG_DASD_PROFILE */
181
182 static int dasd_stats_proc_show(struct seq_file *m, void *v)
183 {
184 #ifdef CONFIG_DASD_PROFILE
185 struct dasd_profile_info_t *prof;
186 int factor;
187
188 /* check for active profiling */
189 if (dasd_profile_level == DASD_PROFILE_OFF) {
190 seq_printf(m, "Statistics are off - they might be "
191 "switched on using 'echo set on > "
192 "/proc/dasd/statistics'\n");
193 return 0;
194 }
195
196 prof = &dasd_global_profile;
197 /* prevent counter 'overflow' on output */
198 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
199 factor *= 10);
200
201 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
202 seq_printf(m, "with %u sectors(512B each)\n",
203 prof->dasd_io_sects);
204 seq_printf(m, "Scale Factor is %d\n", factor);
205 seq_printf(m,
206 " __<4 ___8 __16 __32 __64 _128 "
207 " _256 _512 __1k __2k __4k __8k "
208 " _16k _32k _64k 128k\n");
209 seq_printf(m,
210 " _256 _512 __1M __2M __4M __8M "
211 " _16M _32M _64M 128M 256M 512M "
212 " __1G __2G __4G " " _>4G\n");
213
214 seq_printf(m, "Histogram of sizes (512B secs)\n");
215 dasd_statistics_array(m, prof->dasd_io_secs, factor);
216 seq_printf(m, "Histogram of I/O times (microseconds)\n");
217 dasd_statistics_array(m, prof->dasd_io_times, factor);
218 seq_printf(m, "Histogram of I/O times per sector\n");
219 dasd_statistics_array(m, prof->dasd_io_timps, factor);
220 seq_printf(m, "Histogram of I/O time till ssch\n");
221 dasd_statistics_array(m, prof->dasd_io_time1, factor);
222 seq_printf(m, "Histogram of I/O time between ssch and irq\n");
223 dasd_statistics_array(m, prof->dasd_io_time2, factor);
224 seq_printf(m, "Histogram of I/O time between ssch "
225 "and irq per sector\n");
226 dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
227 seq_printf(m, "Histogram of I/O time between irq and end\n");
228 dasd_statistics_array(m, prof->dasd_io_time3, factor);
229 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
230 dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
231 #else
232 seq_printf(m, "Statistics are not activated in this kernel\n");
233 #endif
234 return 0;
235 }
236
237 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
238 {
239 return single_open(file, dasd_stats_proc_show, NULL);
240 }
241
242 static ssize_t dasd_stats_proc_write(struct file *file,
243 const char __user *user_buf, size_t user_len, loff_t *pos)
244 {
245 #ifdef CONFIG_DASD_PROFILE
246 char *buffer, *str;
247
248 if (user_len > 65536)
249 user_len = 65536;
250 buffer = dasd_get_user_string(user_buf, user_len);
251 if (IS_ERR(buffer))
252 return PTR_ERR(buffer);
253 DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
254
255 /* check for valid verbs */
256 str = skip_spaces(buffer);
257 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
258 /* 'set xxx' was given */
259 str = skip_spaces(str + 4);
260 if (strcmp(str, "on") == 0) {
261 /* switch on statistics profiling */
262 dasd_profile_level = DASD_PROFILE_ON;
263 pr_info("The statistics feature has been switched "
264 "on\n");
265 } else if (strcmp(str, "off") == 0) {
266 /* switch off and reset statistics profiling */
267 memset(&dasd_global_profile,
268 0, sizeof (struct dasd_profile_info_t));
269 dasd_profile_level = DASD_PROFILE_OFF;
270 pr_info("The statistics feature has been switched "
271 "off\n");
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 pr_info("The statistics have been reset\n");
279 } else
280 goto out_error;
281 kfree(buffer);
282 return user_len;
283 out_error:
284 pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
285 str);
286 kfree(buffer);
287 return -EINVAL;
288 #else
289 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
290 return user_len;
291 #endif /* CONFIG_DASD_PROFILE */
292 }
293
294 static const struct file_operations dasd_stats_proc_fops = {
295 .owner = THIS_MODULE,
296 .open = dasd_stats_proc_open,
297 .read = seq_read,
298 .llseek = seq_lseek,
299 .release = single_release,
300 .write = dasd_stats_proc_write,
301 };
302
303 /*
304 * Create dasd proc-fs entries.
305 * In case creation failed, cleanup and return -ENOENT.
306 */
307 int
308 dasd_proc_init(void)
309 {
310 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
311 if (!dasd_proc_root_entry)
312 goto out_nodasd;
313 dasd_devices_entry = proc_create("devices",
314 S_IFREG | S_IRUGO | S_IWUSR,
315 dasd_proc_root_entry,
316 &dasd_devices_file_ops);
317 if (!dasd_devices_entry)
318 goto out_nodevices;
319 dasd_statistics_entry = proc_create("statistics",
320 S_IFREG | S_IRUGO | S_IWUSR,
321 dasd_proc_root_entry,
322 &dasd_stats_proc_fops);
323 if (!dasd_statistics_entry)
324 goto out_nostatistics;
325 return 0;
326
327 out_nostatistics:
328 remove_proc_entry("devices", dasd_proc_root_entry);
329 out_nodevices:
330 remove_proc_entry("dasd", NULL);
331 out_nodasd:
332 return -ENOENT;
333 }
334
335 void
336 dasd_proc_exit(void)
337 {
338 remove_proc_entry("devices", dasd_proc_root_entry);
339 remove_proc_entry("statistics", dasd_proc_root_entry);
340 remove_proc_entry("dasd", NULL);
341 }