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13#define KMSG_COMPONENT "dasd"
14
15#include <linux/ctype.h>
16#include <linux/slab.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
26#define PRINTK_HEADER "dasd_proc:"
27
28#include "dasd_int.h"
29
30static struct proc_dir_entry *dasd_proc_root_entry = NULL;
31static struct proc_dir_entry *dasd_devices_entry = NULL;
32static struct proc_dir_entry *dasd_statistics_entry = NULL;
33
34static int
35dasd_devices_show(struct seq_file *m, void *v)
36{
37 struct dasd_device *device;
38 struct dasd_block *block;
39 char *substr;
40
41 device = dasd_device_from_devindex((unsigned long) v - 1);
42 if (IS_ERR(device))
43 return 0;
44 if (device->block)
45 block = device->block;
46 else {
47 dasd_put_device(device);
48 return 0;
49 }
50
51 seq_printf(m, "%s", dev_name(&device->cdev->dev));
52
53 if (device->discipline != NULL)
54 seq_printf(m, "(%s)", device->discipline->name);
55 else
56 seq_printf(m, "(none)");
57
58 if (block->gdp)
59 seq_printf(m, " at (%3d:%6d)",
60 MAJOR(disk_devt(block->gdp)),
61 MINOR(disk_devt(block->gdp)));
62 else
63 seq_printf(m, " at (???:??????)");
64
65 if (block->gdp)
66 seq_printf(m, " is %-8s", block->gdp->disk_name);
67 else
68 seq_printf(m, " is ????????");
69
70 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
71 seq_printf(m, "%4s: ", substr);
72
73 switch (device->state) {
74 case DASD_STATE_NEW:
75 seq_printf(m, "new");
76 break;
77 case DASD_STATE_KNOWN:
78 seq_printf(m, "detected");
79 break;
80 case DASD_STATE_BASIC:
81 seq_printf(m, "basic");
82 break;
83 case DASD_STATE_UNFMT:
84 seq_printf(m, "unformatted");
85 break;
86 case DASD_STATE_READY:
87 case DASD_STATE_ONLINE:
88 seq_printf(m, "active ");
89 if (dasd_check_blocksize(block->bp_block))
90 seq_printf(m, "n/f ");
91 else
92 seq_printf(m,
93 "at blocksize: %d, %lld blocks, %lld MB",
94 block->bp_block, block->blocks,
95 ((block->bp_block >> 9) *
96 block->blocks) >> 11);
97 break;
98 default:
99 seq_printf(m, "no stat");
100 break;
101 }
102 dasd_put_device(device);
103 if (dasd_probeonly)
104 seq_printf(m, "(probeonly)");
105 seq_printf(m, "\n");
106 return 0;
107}
108
109static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
110{
111 if (*pos >= dasd_max_devindex)
112 return NULL;
113 return (void *)((unsigned long) *pos + 1);
114}
115
116static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
117{
118 ++*pos;
119 return dasd_devices_start(m, pos);
120}
121
122static void dasd_devices_stop(struct seq_file *m, void *v)
123{
124}
125
126static const struct seq_operations dasd_devices_seq_ops = {
127 .start = dasd_devices_start,
128 .next = dasd_devices_next,
129 .stop = dasd_devices_stop,
130 .show = dasd_devices_show,
131};
132
133static int dasd_devices_open(struct inode *inode, struct file *file)
134{
135 return seq_open(file, &dasd_devices_seq_ops);
136}
137
138static const struct file_operations dasd_devices_file_ops = {
139 .owner = THIS_MODULE,
140 .open = dasd_devices_open,
141 .read = seq_read,
142 .llseek = seq_lseek,
143 .release = seq_release,
144};
145
146#ifdef CONFIG_DASD_PROFILE
147static int dasd_stats_all_block_on(void)
148{
149 int i, rc;
150 struct dasd_device *device;
151
152 rc = 0;
153 for (i = 0; i < dasd_max_devindex; ++i) {
154 device = dasd_device_from_devindex(i);
155 if (IS_ERR(device))
156 continue;
157 if (device->block)
158 rc = dasd_profile_on(&device->block->profile);
159 dasd_put_device(device);
160 if (rc)
161 return rc;
162 }
163 return 0;
164}
165
166static void dasd_stats_all_block_off(void)
167{
168 int i;
169 struct dasd_device *device;
170
171 for (i = 0; i < dasd_max_devindex; ++i) {
172 device = dasd_device_from_devindex(i);
173 if (IS_ERR(device))
174 continue;
175 if (device->block)
176 dasd_profile_off(&device->block->profile);
177 dasd_put_device(device);
178 }
179}
180
181static void dasd_stats_all_block_reset(void)
182{
183 int i;
184 struct dasd_device *device;
185
186 for (i = 0; i < dasd_max_devindex; ++i) {
187 device = dasd_device_from_devindex(i);
188 if (IS_ERR(device))
189 continue;
190 if (device->block)
191 dasd_profile_reset(&device->block->profile);
192 dasd_put_device(device);
193 }
194}
195
196static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
197{
198 int i;
199
200 for (i = 0; i < 32; i++) {
201 seq_printf(m, "%7d ", array[i] / factor);
202 if (i == 15)
203 seq_putc(m, '\n');
204 }
205 seq_putc(m, '\n');
206}
207#endif
208
209static int dasd_stats_proc_show(struct seq_file *m, void *v)
210{
211#ifdef CONFIG_DASD_PROFILE
212 struct dasd_profile_info *prof;
213 int factor;
214
215 spin_lock_bh(&dasd_global_profile.lock);
216 prof = dasd_global_profile.data;
217 if (!prof) {
218 spin_unlock_bh(&dasd_global_profile.lock);
219 seq_printf(m, "Statistics are off - they might be "
220 "switched on using 'echo set on > "
221 "/proc/dasd/statistics'\n");
222 return 0;
223 }
224
225
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 spin_unlock_bh(&dasd_global_profile.lock);
260#else
261 seq_printf(m, "Statistics are not activated in this kernel\n");
262#endif
263 return 0;
264}
265
266static int dasd_stats_proc_open(struct inode *inode, struct file *file)
267{
268 return single_open(file, dasd_stats_proc_show, NULL);
269}
270
271static ssize_t dasd_stats_proc_write(struct file *file,
272 const char __user *user_buf, size_t user_len, loff_t *pos)
273{
274#ifdef CONFIG_DASD_PROFILE
275 char *buffer, *str;
276 int rc;
277
278 if (user_len > 65536)
279 user_len = 65536;
280 buffer = dasd_get_user_string(user_buf, user_len);
281 if (IS_ERR(buffer))
282 return PTR_ERR(buffer);
283
284
285 str = skip_spaces(buffer);
286 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
287
288 str = skip_spaces(str + 4);
289 if (strcmp(str, "on") == 0) {
290
291 rc = dasd_stats_all_block_on();
292 if (rc) {
293 dasd_stats_all_block_off();
294 goto out_error;
295 }
296 rc = dasd_profile_on(&dasd_global_profile);
297 if (rc) {
298 dasd_stats_all_block_off();
299 goto out_error;
300 }
301 dasd_profile_reset(&dasd_global_profile);
302 dasd_global_profile_level = DASD_PROFILE_ON;
303 pr_info("The statistics feature has been switched "
304 "on\n");
305 } else if (strcmp(str, "off") == 0) {
306
307 dasd_global_profile_level = DASD_PROFILE_OFF;
308 dasd_profile_off(&dasd_global_profile);
309 dasd_stats_all_block_off();
310 pr_info("The statistics feature has been switched "
311 "off\n");
312 } else
313 goto out_parse_error;
314 } else if (strncmp(str, "reset", 5) == 0) {
315
316 dasd_profile_reset(&dasd_global_profile);
317 dasd_stats_all_block_reset();
318 pr_info("The statistics have been reset\n");
319 } else
320 goto out_parse_error;
321 vfree(buffer);
322 return user_len;
323out_parse_error:
324 rc = -EINVAL;
325 pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
326out_error:
327 vfree(buffer);
328 return rc;
329#else
330 pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
331 return user_len;
332#endif
333}
334
335static const struct file_operations dasd_stats_proc_fops = {
336 .owner = THIS_MODULE,
337 .open = dasd_stats_proc_open,
338 .read = seq_read,
339 .llseek = seq_lseek,
340 .release = single_release,
341 .write = dasd_stats_proc_write,
342};
343
344
345
346
347
348int
349dasd_proc_init(void)
350{
351 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
352 if (!dasd_proc_root_entry)
353 goto out_nodasd;
354 dasd_devices_entry = proc_create("devices",
355 S_IFREG | S_IRUGO | S_IWUSR,
356 dasd_proc_root_entry,
357 &dasd_devices_file_ops);
358 if (!dasd_devices_entry)
359 goto out_nodevices;
360 dasd_statistics_entry = proc_create("statistics",
361 S_IFREG | S_IRUGO | S_IWUSR,
362 dasd_proc_root_entry,
363 &dasd_stats_proc_fops);
364 if (!dasd_statistics_entry)
365 goto out_nostatistics;
366 return 0;
367
368 out_nostatistics:
369 remove_proc_entry("devices", dasd_proc_root_entry);
370 out_nodevices:
371 remove_proc_entry("dasd", NULL);
372 out_nodasd:
373 return -ENOENT;
374}
375
376void
377dasd_proc_exit(void)
378{
379 remove_proc_entry("devices", dasd_proc_root_entry);
380 remove_proc_entry("statistics", dasd_proc_root_entry);
381 remove_proc_entry("dasd", NULL);
382}
383
