1 // SPDX-License-Identifier: GPL-2.0
2 /*
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 * Copyright IBM Corp. 1999, 2002
9 *
10 * /proc interface for the dasd driver.
11 *
12 */
13
14 #include <linux/ctype.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include <linux/seq_file.h>
18 #include <linux/vmalloc.h>
19 #include <linux/proc_fs.h>
20
21 #include <asm/debug.h>
22 #include <linux/uaccess.h>
23
24 #include "dasd_int.h"
25
26 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
27 static struct proc_dir_entry *dasd_devices_entry = NULL;
28 static struct proc_dir_entry *dasd_statistics_entry = NULL;
29
30 static int
dasd_devices_show(struct seq_file * m,void * v)31 dasd_devices_show(struct seq_file *m, void *v)
32 {
33 struct dasd_device *device;
34 struct dasd_block *block;
35 char *substr;
36
37 device = dasd_device_from_devindex((unsigned long) v - 1);
38 if (IS_ERR(device))
39 return 0;
40 if (device->block)
41 block = device->block;
42 else {
43 dasd_put_device(device);
44 return 0;
45 }
46 /* Print device number. */
47 seq_printf(m, "%s", dev_name(&device->cdev->dev));
48 /* Print discipline string. */
49 if (device->discipline != NULL)
50 seq_printf(m, "(%s)", device->discipline->name);
51 else
52 seq_printf(m, "(none)");
53 /* Print kdev. */
54 if (block->gdp)
55 seq_printf(m, " at (%3d:%6d)",
56 MAJOR(disk_devt(block->gdp)),
57 MINOR(disk_devt(block->gdp)));
58 else
59 seq_printf(m, " at (???:??????)");
60 /* Print device name. */
61 if (block->gdp)
62 seq_printf(m, " is %-8s", block->gdp->disk_name);
63 else
64 seq_printf(m, " is ????????");
65 /* Print devices features. */
66 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
67 seq_printf(m, "%4s: ", substr);
68 /* Print device status information. */
69 switch (device->state) {
70 case DASD_STATE_NEW:
71 seq_printf(m, "new");
72 break;
73 case DASD_STATE_KNOWN:
74 seq_printf(m, "detected");
75 break;
76 case DASD_STATE_BASIC:
77 seq_printf(m, "basic");
78 break;
79 case DASD_STATE_UNFMT:
80 seq_printf(m, "unformatted");
81 break;
82 case DASD_STATE_READY:
83 case DASD_STATE_ONLINE:
84 seq_printf(m, "active ");
85 if (dasd_check_blocksize(block->bp_block))
86 seq_printf(m, "n/f ");
87 else
88 seq_printf(m,
89 "at blocksize: %u, %lu blocks, %lu MB",
90 block->bp_block, block->blocks,
91 ((block->bp_block >> 9) *
92 block->blocks) >> 11);
93 break;
94 default:
95 seq_printf(m, "no stat");
96 break;
97 }
98 dasd_put_device(device);
99 if (dasd_probeonly)
100 seq_printf(m, "(probeonly)");
101 seq_printf(m, "\n");
102 return 0;
103 }
104
dasd_devices_start(struct seq_file * m,loff_t * pos)105 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
106 {
107 if (*pos >= dasd_max_devindex)
108 return NULL;
109 return (void *)((unsigned long) *pos + 1);
110 }
111
dasd_devices_next(struct seq_file * m,void * v,loff_t * pos)112 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
113 {
114 ++*pos;
115 return dasd_devices_start(m, pos);
116 }
117
dasd_devices_stop(struct seq_file * m,void * v)118 static void dasd_devices_stop(struct seq_file *m, void *v)
119 {
120 }
121
122 static const struct seq_operations dasd_devices_seq_ops = {
123 .start = dasd_devices_start,
124 .next = dasd_devices_next,
125 .stop = dasd_devices_stop,
126 .show = dasd_devices_show,
127 };
128
129 #ifdef CONFIG_DASD_PROFILE
dasd_stats_all_block_on(void)130 static int dasd_stats_all_block_on(void)
131 {
132 int i, rc;
133 struct dasd_device *device;
134
135 rc = 0;
136 for (i = 0; i < dasd_max_devindex; ++i) {
137 device = dasd_device_from_devindex(i);
138 if (IS_ERR(device))
139 continue;
140 if (device->block)
141 rc = dasd_profile_on(&device->block->profile);
142 dasd_put_device(device);
143 if (rc)
144 return rc;
145 }
146 return 0;
147 }
148
dasd_stats_all_block_off(void)149 static void dasd_stats_all_block_off(void)
150 {
151 int i;
152 struct dasd_device *device;
153
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 dasd_profile_off(&device->block->profile);
160 dasd_put_device(device);
161 }
162 }
163
dasd_stats_all_block_reset(void)164 static void dasd_stats_all_block_reset(void)
165 {
166 int i;
167 struct dasd_device *device;
168
169 for (i = 0; i < dasd_max_devindex; ++i) {
170 device = dasd_device_from_devindex(i);
171 if (IS_ERR(device))
172 continue;
173 if (device->block)
174 dasd_profile_reset(&device->block->profile);
175 dasd_put_device(device);
176 }
177 }
178
dasd_statistics_array(struct seq_file * m,unsigned int * array,int factor)179 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
180 {
181 int i;
182
183 for (i = 0; i < 32; i++) {
184 seq_printf(m, "%7d ", array[i] / factor);
185 if (i == 15)
186 seq_putc(m, '\n');
187 }
188 seq_putc(m, '\n');
189 }
190 #endif /* CONFIG_DASD_PROFILE */
191
dasd_stats_proc_show(struct seq_file * m,void * v)192 static int dasd_stats_proc_show(struct seq_file *m, void *v)
193 {
194 #ifdef CONFIG_DASD_PROFILE
195 struct dasd_profile_info *prof;
196 int factor;
197
198 spin_lock_bh(&dasd_global_profile.lock);
199 prof = dasd_global_profile.data;
200 if (!prof) {
201 spin_unlock_bh(&dasd_global_profile.lock);
202 seq_printf(m, "Statistics are off - they might be "
203 "switched on using 'echo set on > "
204 "/proc/dasd/statistics'\n");
205 return 0;
206 }
207
208 /* prevent counter 'overflow' on output */
209 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
210 factor *= 10);
211
212 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
213 seq_printf(m, "with %u sectors(512B each)\n",
214 prof->dasd_io_sects);
215 seq_printf(m, "Scale Factor is %d\n", factor);
216 seq_printf(m,
217 " __<4 ___8 __16 __32 __64 _128 "
218 " _256 _512 __1k __2k __4k __8k "
219 " _16k _32k _64k 128k\n");
220 seq_printf(m,
221 " _256 _512 __1M __2M __4M __8M "
222 " _16M _32M _64M 128M 256M 512M "
223 " __1G __2G __4G " " _>4G\n");
224
225 seq_printf(m, "Histogram of sizes (512B secs)\n");
226 dasd_statistics_array(m, prof->dasd_io_secs, factor);
227 seq_printf(m, "Histogram of I/O times (microseconds)\n");
228 dasd_statistics_array(m, prof->dasd_io_times, factor);
229 seq_printf(m, "Histogram of I/O times per sector\n");
230 dasd_statistics_array(m, prof->dasd_io_timps, factor);
231 seq_printf(m, "Histogram of I/O time till ssch\n");
232 dasd_statistics_array(m, prof->dasd_io_time1, factor);
233 seq_printf(m, "Histogram of I/O time between ssch and irq\n");
234 dasd_statistics_array(m, prof->dasd_io_time2, factor);
235 seq_printf(m, "Histogram of I/O time between ssch "
236 "and irq per sector\n");
237 dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
238 seq_printf(m, "Histogram of I/O time between irq and end\n");
239 dasd_statistics_array(m, prof->dasd_io_time3, factor);
240 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
241 dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
242 spin_unlock_bh(&dasd_global_profile.lock);
243 #else
244 seq_printf(m, "Statistics are not activated in this kernel\n");
245 #endif
246 return 0;
247 }
248
dasd_stats_proc_open(struct inode * inode,struct file * file)249 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
250 {
251 return single_open(file, dasd_stats_proc_show, NULL);
252 }
253
dasd_stats_proc_write(struct file * file,const char __user * user_buf,size_t user_len,loff_t * pos)254 static ssize_t dasd_stats_proc_write(struct file *file,
255 const char __user *user_buf, size_t user_len, loff_t *pos)
256 {
257 #ifdef CONFIG_DASD_PROFILE
258 char *buffer, *str;
259 int rc;
260
261 if (user_len > 65536)
262 user_len = 65536;
263 buffer = dasd_get_user_string(user_buf, user_len);
264 if (IS_ERR(buffer))
265 return PTR_ERR(buffer);
266
267 /* check for valid verbs */
268 str = skip_spaces(buffer);
269 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
270 /* 'set xxx' was given */
271 str = skip_spaces(str + 4);
272 if (strcmp(str, "on") == 0) {
273 /* switch on statistics profiling */
274 rc = dasd_stats_all_block_on();
275 if (rc) {
276 dasd_stats_all_block_off();
277 goto out_error;
278 }
279 rc = dasd_profile_on(&dasd_global_profile);
280 if (rc) {
281 dasd_stats_all_block_off();
282 goto out_error;
283 }
284 dasd_profile_reset(&dasd_global_profile);
285 dasd_global_profile_level = DASD_PROFILE_ON;
286 pr_info("The statistics feature has been switched "
287 "on\n");
288 } else if (strcmp(str, "off") == 0) {
289 /* switch off statistics profiling */
290 dasd_global_profile_level = DASD_PROFILE_OFF;
291 dasd_profile_off(&dasd_global_profile);
292 dasd_stats_all_block_off();
293 pr_info("The statistics feature has been switched "
294 "off\n");
295 } else
296 goto out_parse_error;
297 } else if (strncmp(str, "reset", 5) == 0) {
298 /* reset the statistics */
299 dasd_profile_reset(&dasd_global_profile);
300 dasd_stats_all_block_reset();
301 pr_info("The statistics have been reset\n");
302 } else
303 goto out_parse_error;
304 vfree(buffer);
305 return user_len;
306 out_parse_error:
307 rc = -EINVAL;
308 pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
309 out_error:
310 vfree(buffer);
311 return rc;
312 #else
313 pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
314 return user_len;
315 #endif /* CONFIG_DASD_PROFILE */
316 }
317
318 static const struct proc_ops dasd_stats_proc_ops = {
319 .proc_open = dasd_stats_proc_open,
320 .proc_read = seq_read,
321 .proc_lseek = seq_lseek,
322 .proc_release = single_release,
323 .proc_write = dasd_stats_proc_write,
324 };
325
326 /*
327 * Create dasd proc-fs entries.
328 * In case creation failed, cleanup and return -ENOENT.
329 */
330 int
dasd_proc_init(void)331 dasd_proc_init(void)
332 {
333 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
334 if (!dasd_proc_root_entry)
335 goto out_nodasd;
336 dasd_devices_entry = proc_create_seq("devices", 0444,
337 dasd_proc_root_entry,
338 &dasd_devices_seq_ops);
339 if (!dasd_devices_entry)
340 goto out_nodevices;
341 dasd_statistics_entry = proc_create("statistics",
342 S_IFREG | S_IRUGO | S_IWUSR,
343 dasd_proc_root_entry,
344 &dasd_stats_proc_ops);
345 if (!dasd_statistics_entry)
346 goto out_nostatistics;
347 return 0;
348
349 out_nostatistics:
350 remove_proc_entry("devices", dasd_proc_root_entry);
351 out_nodevices:
352 remove_proc_entry("dasd", NULL);
353 out_nodasd:
354 return -ENOENT;
355 }
356
357 void
dasd_proc_exit(void)358 dasd_proc_exit(void)
359 {
360 remove_proc_entry("devices", dasd_proc_root_entry);
361 remove_proc_entry("statistics", dasd_proc_root_entry);
362 remove_proc_entry("dasd", NULL);
363 }
364