Loading...
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
31static struct proc_dir_entry *dasd_proc_root_entry = NULL;
32static struct proc_dir_entry *dasd_devices_entry = NULL;
33static struct proc_dir_entry *dasd_statistics_entry = NULL;
34
35static int
36dasd_devices_show(struct seq_file *m, void *v)
37{
38 struct dasd_device *device;
39 struct dasd_block *block;
40 char *substr;
41
42 device = dasd_device_from_devindex((unsigned long) v - 1);
43 if (IS_ERR(device))
44 return 0;
45 if (device->block)
46 block = device->block;
47 else {
48 dasd_put_device(device);
49 return 0;
50 }
51 /* Print device number. */
52 seq_printf(m, "%s", dev_name(&device->cdev->dev));
53 /* Print discipline string. */
54 if (device->discipline != NULL)
55 seq_printf(m, "(%s)", device->discipline->name);
56 else
57 seq_printf(m, "(none)");
58 /* Print kdev. */
59 if (block->gdp)
60 seq_printf(m, " at (%3d:%6d)",
61 MAJOR(disk_devt(block->gdp)),
62 MINOR(disk_devt(block->gdp)));
63 else
64 seq_printf(m, " at (???:??????)");
65 /* Print device name. */
66 if (block->gdp)
67 seq_printf(m, " is %-8s", block->gdp->disk_name);
68 else
69 seq_printf(m, " is ????????");
70 /* Print devices features. */
71 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
72 seq_printf(m, "%4s: ", substr);
73 /* Print device status information. */
74 switch (device->state) {
75 case DASD_STATE_NEW:
76 seq_printf(m, "new");
77 break;
78 case DASD_STATE_KNOWN:
79 seq_printf(m, "detected");
80 break;
81 case DASD_STATE_BASIC:
82 seq_printf(m, "basic");
83 break;
84 case DASD_STATE_UNFMT:
85 seq_printf(m, "unformatted");
86 break;
87 case DASD_STATE_READY:
88 case DASD_STATE_ONLINE:
89 seq_printf(m, "active ");
90 if (dasd_check_blocksize(block->bp_block))
91 seq_printf(m, "n/f ");
92 else
93 seq_printf(m,
94 "at blocksize: %d, %lld blocks, %lld MB",
95 block->bp_block, block->blocks,
96 ((block->bp_block >> 9) *
97 block->blocks) >> 11);
98 break;
99 default:
100 seq_printf(m, "no stat");
101 break;
102 }
103 dasd_put_device(device);
104 if (dasd_probeonly)
105 seq_printf(m, "(probeonly)");
106 seq_printf(m, "\n");
107 return 0;
108}
109
110static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
111{
112 if (*pos >= dasd_max_devindex)
113 return NULL;
114 return (void *)((unsigned long) *pos + 1);
115}
116
117static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
118{
119 ++*pos;
120 return dasd_devices_start(m, pos);
121}
122
123static void dasd_devices_stop(struct seq_file *m, void *v)
124{
125}
126
127static const struct seq_operations dasd_devices_seq_ops = {
128 .start = dasd_devices_start,
129 .next = dasd_devices_next,
130 .stop = dasd_devices_stop,
131 .show = dasd_devices_show,
132};
133
134static int dasd_devices_open(struct inode *inode, struct file *file)
135{
136 return seq_open(file, &dasd_devices_seq_ops);
137}
138
139static const struct file_operations dasd_devices_file_ops = {
140 .owner = THIS_MODULE,
141 .open = dasd_devices_open,
142 .read = seq_read,
143 .llseek = seq_lseek,
144 .release = seq_release,
145};
146
147#ifdef CONFIG_DASD_PROFILE
148static int dasd_stats_all_block_on(void)
149{
150 int i, rc;
151 struct dasd_device *device;
152
153 rc = 0;
154 for (i = 0; i < dasd_max_devindex; ++i) {
155 device = dasd_device_from_devindex(i);
156 if (IS_ERR(device))
157 continue;
158 if (device->block)
159 rc = dasd_profile_on(&device->block->profile);
160 dasd_put_device(device);
161 if (rc)
162 return rc;
163 }
164 return 0;
165}
166
167static void dasd_stats_all_block_off(void)
168{
169 int i;
170 struct dasd_device *device;
171
172 for (i = 0; i < dasd_max_devindex; ++i) {
173 device = dasd_device_from_devindex(i);
174 if (IS_ERR(device))
175 continue;
176 if (device->block)
177 dasd_profile_off(&device->block->profile);
178 dasd_put_device(device);
179 }
180}
181
182static void dasd_stats_all_block_reset(void)
183{
184 int i;
185 struct dasd_device *device;
186
187 for (i = 0; i < dasd_max_devindex; ++i) {
188 device = dasd_device_from_devindex(i);
189 if (IS_ERR(device))
190 continue;
191 if (device->block)
192 dasd_profile_reset(&device->block->profile);
193 dasd_put_device(device);
194 }
195}
196
197static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
198{
199 int i;
200
201 for (i = 0; i < 32; i++) {
202 seq_printf(m, "%7d ", array[i] / factor);
203 if (i == 15)
204 seq_putc(m, '\n');
205 }
206 seq_putc(m, '\n');
207}
208#endif /* CONFIG_DASD_PROFILE */
209
210static int dasd_stats_proc_show(struct seq_file *m, void *v)
211{
212#ifdef CONFIG_DASD_PROFILE
213 struct dasd_profile_info *prof;
214 int factor;
215
216 /* check for active profiling */
217 if (!dasd_global_profile_level) {
218 seq_printf(m, "Statistics are off - they might be "
219 "switched on using 'echo set on > "
220 "/proc/dasd/statistics'\n");
221 return 0;
222 }
223 prof = &dasd_global_profile_data;
224
225 /* prevent counter 'overflow' on output */
226 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
227 factor *= 10);
228
229 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
230 seq_printf(m, "with %u sectors(512B each)\n",
231 prof->dasd_io_sects);
232 seq_printf(m, "Scale Factor is %d\n", factor);
233 seq_printf(m,
234 " __<4 ___8 __16 __32 __64 _128 "
235 " _256 _512 __1k __2k __4k __8k "
236 " _16k _32k _64k 128k\n");
237 seq_printf(m,
238 " _256 _512 __1M __2M __4M __8M "
239 " _16M _32M _64M 128M 256M 512M "
240 " __1G __2G __4G " " _>4G\n");
241
242 seq_printf(m, "Histogram of sizes (512B secs)\n");
243 dasd_statistics_array(m, prof->dasd_io_secs, factor);
244 seq_printf(m, "Histogram of I/O times (microseconds)\n");
245 dasd_statistics_array(m, prof->dasd_io_times, factor);
246 seq_printf(m, "Histogram of I/O times per sector\n");
247 dasd_statistics_array(m, prof->dasd_io_timps, factor);
248 seq_printf(m, "Histogram of I/O time till ssch\n");
249 dasd_statistics_array(m, prof->dasd_io_time1, factor);
250 seq_printf(m, "Histogram of I/O time between ssch and irq\n");
251 dasd_statistics_array(m, prof->dasd_io_time2, factor);
252 seq_printf(m, "Histogram of I/O time between ssch "
253 "and irq per sector\n");
254 dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
255 seq_printf(m, "Histogram of I/O time between irq and end\n");
256 dasd_statistics_array(m, prof->dasd_io_time3, factor);
257 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
258 dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
259#else
260 seq_printf(m, "Statistics are not activated in this kernel\n");
261#endif
262 return 0;
263}
264
265static int dasd_stats_proc_open(struct inode *inode, struct file *file)
266{
267 return single_open(file, dasd_stats_proc_show, NULL);
268}
269
270static ssize_t dasd_stats_proc_write(struct file *file,
271 const char __user *user_buf, size_t user_len, loff_t *pos)
272{
273#ifdef CONFIG_DASD_PROFILE
274 char *buffer, *str;
275 int rc;
276
277 if (user_len > 65536)
278 user_len = 65536;
279 buffer = dasd_get_user_string(user_buf, user_len);
280 if (IS_ERR(buffer))
281 return PTR_ERR(buffer);
282
283 /* check for valid verbs */
284 str = skip_spaces(buffer);
285 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
286 /* 'set xxx' was given */
287 str = skip_spaces(str + 4);
288 if (strcmp(str, "on") == 0) {
289 /* switch on statistics profiling */
290 rc = dasd_stats_all_block_on();
291 if (rc) {
292 dasd_stats_all_block_off();
293 goto out_error;
294 }
295 dasd_global_profile_reset();
296 dasd_global_profile_level = DASD_PROFILE_ON;
297 pr_info("The statistics feature has been switched "
298 "on\n");
299 } else if (strcmp(str, "off") == 0) {
300 /* switch off and reset statistics profiling */
301 dasd_global_profile_level = DASD_PROFILE_OFF;
302 dasd_global_profile_reset();
303 dasd_stats_all_block_off();
304 pr_info("The statistics feature has been switched "
305 "off\n");
306 } else
307 goto out_parse_error;
308 } else if (strncmp(str, "reset", 5) == 0) {
309 /* reset the statistics */
310 dasd_global_profile_reset();
311 dasd_stats_all_block_reset();
312 pr_info("The statistics have been reset\n");
313 } else
314 goto out_parse_error;
315 vfree(buffer);
316 return user_len;
317out_parse_error:
318 rc = -EINVAL;
319 pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
320 str);
321out_error:
322 vfree(buffer);
323 return rc;
324#else
325 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
326 return user_len;
327#endif /* CONFIG_DASD_PROFILE */
328}
329
330static const struct file_operations dasd_stats_proc_fops = {
331 .owner = THIS_MODULE,
332 .open = dasd_stats_proc_open,
333 .read = seq_read,
334 .llseek = seq_lseek,
335 .release = single_release,
336 .write = dasd_stats_proc_write,
337};
338
339/*
340 * Create dasd proc-fs entries.
341 * In case creation failed, cleanup and return -ENOENT.
342 */
343int
344dasd_proc_init(void)
345{
346 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
347 if (!dasd_proc_root_entry)
348 goto out_nodasd;
349 dasd_devices_entry = proc_create("devices",
350 S_IFREG | S_IRUGO | S_IWUSR,
351 dasd_proc_root_entry,
352 &dasd_devices_file_ops);
353 if (!dasd_devices_entry)
354 goto out_nodevices;
355 dasd_statistics_entry = proc_create("statistics",
356 S_IFREG | S_IRUGO | S_IWUSR,
357 dasd_proc_root_entry,
358 &dasd_stats_proc_fops);
359 if (!dasd_statistics_entry)
360 goto out_nostatistics;
361 return 0;
362
363 out_nostatistics:
364 remove_proc_entry("devices", dasd_proc_root_entry);
365 out_nodevices:
366 remove_proc_entry("dasd", NULL);
367 out_nodasd:
368 return -ENOENT;
369}
370
371void
372dasd_proc_exit(void)
373{
374 remove_proc_entry("devices", dasd_proc_root_entry);
375 remove_proc_entry("statistics", dasd_proc_root_entry);
376 remove_proc_entry("dasd", NULL);
377}