[go: nahoru, domu]
1/*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 *		    Horst Hummel <Horst.Hummel@de.ibm.com>
4 *		    Carsten Otte <Cotte@de.ibm.com>
5 *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Coypright IBM Corp. 1999, 2002
8 *
9 * /proc interface for the dasd driver.
10 *
11 */
12
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/* This is ugly... */
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	/* Print device number. */
51	seq_printf(m, "%s", dev_name(&device->cdev->dev));
52	/* Print discipline string. */
53	if (device->discipline != NULL)
54		seq_printf(m, "(%s)", device->discipline->name);
55	else
56		seq_printf(m, "(none)");
57	/* Print kdev. */
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	/* Print device name. */
65	if (block->gdp)
66		seq_printf(m, " is %-8s", block->gdp->disk_name);
67	else
68		seq_printf(m, " is ????????");
69	/* Print devices features. */
70	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
71	seq_printf(m, "%4s: ", substr);
72	/* Print device status information. */
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 /* CONFIG_DASD_PROFILE */
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	/* check for active profiling */
216	if (!dasd_global_profile_level) {
217		seq_printf(m, "Statistics are off - they might be "
218				    "switched on using 'echo set on > "
219				    "/proc/dasd/statistics'\n");
220		return 0;
221	}
222	prof = &dasd_global_profile_data;
223
224	/* prevent counter 'overflow' on output */
225	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
226	     factor *= 10);
227
228	seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
229	seq_printf(m, "with %u sectors(512B each)\n",
230		       prof->dasd_io_sects);
231	seq_printf(m, "Scale Factor is  %d\n", factor);
232	seq_printf(m,
233		       "   __<4	   ___8	   __16	   __32	   __64	   _128	"
234		       "   _256	   _512	   __1k	   __2k	   __4k	   __8k	"
235		       "   _16k	   _32k	   _64k	   128k\n");
236	seq_printf(m,
237		       "   _256	   _512	   __1M	   __2M	   __4M	   __8M	"
238		       "   _16M	   _32M	   _64M	   128M	   256M	   512M	"
239		       "   __1G	   __2G	   __4G " "   _>4G\n");
240
241	seq_printf(m, "Histogram of sizes (512B secs)\n");
242	dasd_statistics_array(m, prof->dasd_io_secs, factor);
243	seq_printf(m, "Histogram of I/O times (microseconds)\n");
244	dasd_statistics_array(m, prof->dasd_io_times, factor);
245	seq_printf(m, "Histogram of I/O times per sector\n");
246	dasd_statistics_array(m, prof->dasd_io_timps, factor);
247	seq_printf(m, "Histogram of I/O time till ssch\n");
248	dasd_statistics_array(m, prof->dasd_io_time1, factor);
249	seq_printf(m, "Histogram of I/O time between ssch and irq\n");
250	dasd_statistics_array(m, prof->dasd_io_time2, factor);
251	seq_printf(m, "Histogram of I/O time between ssch "
252			    "and irq per sector\n");
253	dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
254	seq_printf(m, "Histogram of I/O time between irq and end\n");
255	dasd_statistics_array(m, prof->dasd_io_time3, factor);
256	seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
257	dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
258#else
259	seq_printf(m, "Statistics are not activated in this kernel\n");
260#endif
261	return 0;
262}
263
264static int dasd_stats_proc_open(struct inode *inode, struct file *file)
265{
266	return single_open(file, dasd_stats_proc_show, NULL);
267}
268
269static ssize_t dasd_stats_proc_write(struct file *file,
270		const char __user *user_buf, size_t user_len, loff_t *pos)
271{
272#ifdef CONFIG_DASD_PROFILE
273	char *buffer, *str;
274	int rc;
275
276	if (user_len > 65536)
277		user_len = 65536;
278	buffer = dasd_get_user_string(user_buf, user_len);
279	if (IS_ERR(buffer))
280		return PTR_ERR(buffer);
281
282	/* check for valid verbs */
283	str = skip_spaces(buffer);
284	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
285		/* 'set xxx' was given */
286		str = skip_spaces(str + 4);
287		if (strcmp(str, "on") == 0) {
288			/* switch on statistics profiling */
289			rc = dasd_stats_all_block_on();
290			if (rc) {
291				dasd_stats_all_block_off();
292				goto out_error;
293			}
294			dasd_global_profile_reset();
295			dasd_global_profile_level = DASD_PROFILE_ON;
296			pr_info("The statistics feature has been switched "
297				"on\n");
298		} else if (strcmp(str, "off") == 0) {
299			/* switch off and reset statistics profiling */
300			dasd_global_profile_level = DASD_PROFILE_OFF;
301			dasd_global_profile_reset();
302			dasd_stats_all_block_off();
303			pr_info("The statistics feature has been switched "
304				"off\n");
305		} else
306			goto out_parse_error;
307	} else if (strncmp(str, "reset", 5) == 0) {
308		/* reset the statistics */
309		dasd_global_profile_reset();
310		dasd_stats_all_block_reset();
311		pr_info("The statistics have been reset\n");
312	} else
313		goto out_parse_error;
314	vfree(buffer);
315	return user_len;
316out_parse_error:
317	rc = -EINVAL;
318	pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
319		str);
320out_error:
321	vfree(buffer);
322	return rc;
323#else
324	pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
325	return user_len;
326#endif				/* CONFIG_DASD_PROFILE */
327}
328
329static const struct file_operations dasd_stats_proc_fops = {
330	.owner		= THIS_MODULE,
331	.open		= dasd_stats_proc_open,
332	.read		= seq_read,
333	.llseek		= seq_lseek,
334	.release	= single_release,
335	.write		= dasd_stats_proc_write,
336};
337
338/*
339 * Create dasd proc-fs entries.
340 * In case creation failed, cleanup and return -ENOENT.
341 */
342int
343dasd_proc_init(void)
344{
345	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
346	if (!dasd_proc_root_entry)
347		goto out_nodasd;
348	dasd_devices_entry = proc_create("devices",
349					 S_IFREG | S_IRUGO | S_IWUSR,
350					 dasd_proc_root_entry,
351					 &dasd_devices_file_ops);
352	if (!dasd_devices_entry)
353		goto out_nodevices;
354	dasd_statistics_entry = proc_create("statistics",
355					    S_IFREG | S_IRUGO | S_IWUSR,
356					    dasd_proc_root_entry,
357					    &dasd_stats_proc_fops);
358	if (!dasd_statistics_entry)
359		goto out_nostatistics;
360	return 0;
361
362 out_nostatistics:
363	remove_proc_entry("devices", dasd_proc_root_entry);
364 out_nodevices:
365	remove_proc_entry("dasd", NULL);
366 out_nodasd:
367	return -ENOENT;
368}
369
370void
371dasd_proc_exit(void)
372{
373	remove_proc_entry("devices", dasd_proc_root_entry);
374	remove_proc_entry("statistics", dasd_proc_root_entry);
375	remove_proc_entry("dasd", NULL);
376}
377