xref: /openbmc/linux/drivers/s390/block/dasd_proc.c (revision 63dc02bd) 
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 static int
36 dasd_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 
110 static 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 
117 static 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 
123 static void dasd_devices_stop(struct seq_file *m, void *v)
124 {
125 }
126 
127 static 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 
134 static int dasd_devices_open(struct inode *inode, struct file *file)
135 {
136 	return seq_open(file, &dasd_devices_seq_ops);
137 }
138 
139 static 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
148 static 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 
167 static 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 
182 static 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 
197 static 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 
210 static 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 
265 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
266 {
267 	return single_open(file, dasd_stats_proc_show, NULL);
268 }
269 
270 static 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;
317 out_parse_error:
318 	rc = -EINVAL;
319 	pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
320 		str);
321 out_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 
330 static 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  */
343 int
344 dasd_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 
371 void
372 dasd_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 }
378