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sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / s390 / block / dasd_proc.c
blobc4a6a31bd9cdcb623e241389e8787b7cd0436f56
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/slab.h>
18 #include <linux/string.h>
19 #include <linux/seq_file.h>
20 #include <linux/vmalloc.h>
21 #include <linux/proc_fs.h>
22
23 #include <asm/debug.h>
24 #include <asm/uaccess.h>
25
26 /* This is ugly... */
27 #define PRINTK_HEADER "dasd_proc:"
28
29 #include "dasd_int.h"
30
31 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
32 static struct proc_dir_entry *dasd_devices_entry = NULL;
33 static struct proc_dir_entry *dasd_statistics_entry = NULL;
34
35 #ifdef CONFIG_DASD_PROFILE
36 static char *
37 dasd_get_user_string(const char __user *user_buf, size_t user_len)
38 {
39 char *buffer;
40
41 buffer = kmalloc(user_len + 1, GFP_KERNEL);
42 if (buffer == NULL)
43 return ERR_PTR(-ENOMEM);
44 if (copy_from_user(buffer, user_buf, user_len) != 0) {
45 kfree(buffer);
46 return ERR_PTR(-EFAULT);
47 }
48 /* got the string, now strip linefeed. */
49 if (buffer[user_len - 1] == '\n')
50 buffer[user_len - 1] = 0;
51 else
52 buffer[user_len] = 0;
53 return buffer;
54 }
55 #endif /* CONFIG_DASD_PROFILE */
56
57 static int
58 dasd_devices_show(struct seq_file *m, void *v)
59 {
60 struct dasd_device *device;
61 struct dasd_block *block;
62 char *substr;
63
64 device = dasd_device_from_devindex((unsigned long) v - 1);
65 if (IS_ERR(device))
66 return 0;
67 if (device->block)
68 block = device->block;
69 else {
70 dasd_put_device(device);
71 return 0;
72 }
73 /* Print device number. */
74 seq_printf(m, "%s", dev_name(&device->cdev->dev));
75 /* Print discipline string. */
76 if (device->discipline != NULL)
77 seq_printf(m, "(%s)", device->discipline->name);
78 else
79 seq_printf(m, "(none)");
80 /* Print kdev. */
81 if (block->gdp)
82 seq_printf(m, " at (%3d:%6d)",
83 MAJOR(disk_devt(block->gdp)),
84 MINOR(disk_devt(block->gdp)));
85 else
86 seq_printf(m, " at (???:??????)");
87 /* Print device name. */
88 if (block->gdp)
89 seq_printf(m, " is %-8s", block->gdp->disk_name);
90 else
91 seq_printf(m, " is ????????");
92 /* Print devices features. */
93 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
94 seq_printf(m, "%4s: ", substr);
95 /* Print device status information. */
96 switch (device->state) {
97 case DASD_STATE_NEW:
98 seq_printf(m, "new");
99 break;
100 case DASD_STATE_KNOWN:
101 seq_printf(m, "detected");
102 break;
103 case DASD_STATE_BASIC:
104 seq_printf(m, "basic");
105 break;
106 case DASD_STATE_UNFMT:
107 seq_printf(m, "unformatted");
108 break;
109 case DASD_STATE_READY:
110 case DASD_STATE_ONLINE:
111 seq_printf(m, "active ");
112 if (dasd_check_blocksize(block->bp_block))
113 seq_printf(m, "n/f ");
114 else
115 seq_printf(m,
116 "at blocksize: %d, %lld blocks, %lld MB",
117 block->bp_block, block->blocks,
118 ((block->bp_block >> 9) *
119 block->blocks) >> 11);
120 break;
121 default:
122 seq_printf(m, "no stat");
123 break;
124 }
125 dasd_put_device(device);
126 if (dasd_probeonly)
127 seq_printf(m, "(probeonly)");
128 seq_printf(m, "\n");
129 return 0;
130 }
131
132 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
133 {
134 if (*pos >= dasd_max_devindex)
135 return NULL;
136 return (void *)((unsigned long) *pos + 1);
137 }
138
139 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
140 {
141 ++*pos;
142 return dasd_devices_start(m, pos);
143 }
144
145 static void dasd_devices_stop(struct seq_file *m, void *v)
146 {
147 }
148
149 static const struct seq_operations dasd_devices_seq_ops = {
150 .start = dasd_devices_start,
151 .next = dasd_devices_next,
152 .stop = dasd_devices_stop,
153 .show = dasd_devices_show,
154 };
155
156 static int dasd_devices_open(struct inode *inode, struct file *file)
157 {
158 return seq_open(file, &dasd_devices_seq_ops);
159 }
160
161 static const struct file_operations dasd_devices_file_ops = {
162 .owner = THIS_MODULE,
163 .open = dasd_devices_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = seq_release,
167 };
168
169 #ifdef CONFIG_DASD_PROFILE
170 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
171 {
172 int i;
173
174 for (i = 0; i < 32; i++) {
175 seq_printf(m, "%7d ", array[i] / factor);
176 if (i == 15)
177 seq_putc(m, '\n');
178 }
179 seq_putc(m, '\n');
180 }
181 #endif /* CONFIG_DASD_PROFILE */
182
183 static int dasd_stats_proc_show(struct seq_file *m, void *v)
184 {
185 #ifdef CONFIG_DASD_PROFILE
186 struct dasd_profile_info_t *prof;
187 int factor;
188
189 /* check for active profiling */
190 if (dasd_profile_level == DASD_PROFILE_OFF) {
191 seq_printf(m, "Statistics are off - they might be "
192 "switched on using 'echo set on > "
193 "/proc/dasd/statistics'\n");
194 return 0;
195 }
196
197 prof = &dasd_global_profile;
198 /* prevent counter 'overflow' on output */
199 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
200 factor *= 10);
201
202 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
203 seq_printf(m, "with %u sectors(512B each)\n",
204 prof->dasd_io_sects);
205 seq_printf(m, "Scale Factor is %d\n", factor);
206 seq_printf(m,
207 " __<4 ___8 __16 __32 __64 _128 "
208 " _256 _512 __1k __2k __4k __8k "
209 " _16k _32k _64k 128k\n");
210 seq_printf(m,
211 " _256 _512 __1M __2M __4M __8M "
212 " _16M _32M _64M 128M 256M 512M "
213 " __1G __2G __4G " " _>4G\n");
214
215 seq_printf(m, "Histogram of sizes (512B secs)\n");
216 dasd_statistics_array(m, prof->dasd_io_secs, factor);
217 seq_printf(m, "Histogram of I/O times (microseconds)\n");
218 dasd_statistics_array(m, prof->dasd_io_times, factor);
219 seq_printf(m, "Histogram of I/O times per sector\n");
220 dasd_statistics_array(m, prof->dasd_io_timps, factor);
221 seq_printf(m, "Histogram of I/O time till ssch\n");
222 dasd_statistics_array(m, prof->dasd_io_time1, factor);
223 seq_printf(m, "Histogram of I/O time between ssch and irq\n");
224 dasd_statistics_array(m, prof->dasd_io_time2, factor);
225 seq_printf(m, "Histogram of I/O time between ssch "
226 "and irq per sector\n");
227 dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
228 seq_printf(m, "Histogram of I/O time between irq and end\n");
229 dasd_statistics_array(m, prof->dasd_io_time3, factor);
230 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
231 dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
232 #else
233 seq_printf(m, "Statistics are not activated in this kernel\n");
234 #endif
235 return 0;
236 }
237
238 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
239 {
240 return single_open(file, dasd_stats_proc_show, NULL);
241 }
242
243 static ssize_t dasd_stats_proc_write(struct file *file,
244 const char __user *user_buf, size_t user_len, loff_t *pos)
245 {
246 #ifdef CONFIG_DASD_PROFILE
247 char *buffer, *str;
248
249 if (user_len > 65536)
250 user_len = 65536;
251 buffer = dasd_get_user_string(user_buf, user_len);
252 if (IS_ERR(buffer))
253 return PTR_ERR(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 }