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}
378