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
10 * /proc interface for the dasd driver.
14 #define KMSG_COMPONENT "dasd"
16 #include <linux/ctype.h>
17 #include <linux/string.h>
18 #include <linux/seq_file.h>
19 #include <linux/vmalloc.h>
20 #include <linux/proc_fs.h>
22 #include <asm/debug.h>
23 #include <asm/uaccess.h>
26 #define PRINTK_HEADER "dasd_proc:"
30 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
31 static struct proc_dir_entry *dasd_devices_entry = NULL;
32 static struct proc_dir_entry *dasd_statistics_entry = NULL;
34 #ifdef CONFIG_DASD_PROFILE
36 dasd_get_user_string(const char __user *user_buf, size_t user_len)
40 buffer = kmalloc(user_len + 1, GFP_KERNEL);
42 return ERR_PTR(-ENOMEM);
43 if (copy_from_user(buffer, user_buf, user_len) != 0) {
45 return ERR_PTR(-EFAULT);
47 /* got the string, now strip linefeed. */
48 if (buffer[user_len - 1] == '\n')
49 buffer[user_len - 1] = 0;
54 #endif /* CONFIG_DASD_PROFILE */
57 dasd_devices_show(struct seq_file *m, void *v)
59 struct dasd_device *device;
60 struct dasd_block *block;
63 device = dasd_device_from_devindex((unsigned long) v - 1);
67 block = device->block;
69 dasd_put_device(device);
72 /* Print device number. */
73 seq_printf(m, "%s", dev_name(&device->cdev->dev));
74 /* Print discipline string. */
75 if (device != NULL && device->discipline != NULL)
76 seq_printf(m, "(%s)", device->discipline->name);
78 seq_printf(m, "(none)");
81 seq_printf(m, " at (%3d:%6d)",
82 MAJOR(disk_devt(block->gdp)),
83 MINOR(disk_devt(block->gdp)));
85 seq_printf(m, " at (???:??????)");
86 /* Print device name. */
88 seq_printf(m, " is %-8s", block->gdp->disk_name);
90 seq_printf(m, " is ????????");
91 /* Print devices features. */
92 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
93 seq_printf(m, "%4s: ", substr);
94 /* Print device status information. */
95 switch ((device != NULL) ? device->state : -1) {
97 seq_printf(m, "unknown");
100 seq_printf(m, "new");
102 case DASD_STATE_KNOWN:
103 seq_printf(m, "detected");
105 case DASD_STATE_BASIC:
106 seq_printf(m, "basic");
108 case DASD_STATE_UNFMT:
109 seq_printf(m, "unformatted");
111 case DASD_STATE_READY:
112 case DASD_STATE_ONLINE:
113 seq_printf(m, "active ");
114 if (dasd_check_blocksize(block->bp_block))
115 seq_printf(m, "n/f ");
118 "at blocksize: %d, %lld blocks, %lld MB",
119 block->bp_block, block->blocks,
120 ((block->bp_block >> 9) *
121 block->blocks) >> 11);
124 seq_printf(m, "no stat");
127 dasd_put_device(device);
129 seq_printf(m, "(probeonly)");
134 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
136 if (*pos >= dasd_max_devindex)
138 return (void *)((unsigned long) *pos + 1);
141 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
144 return dasd_devices_start(m, pos);
147 static void dasd_devices_stop(struct seq_file *m, void *v)
151 static const struct seq_operations dasd_devices_seq_ops = {
152 .start = dasd_devices_start,
153 .next = dasd_devices_next,
154 .stop = dasd_devices_stop,
155 .show = dasd_devices_show,
158 static int dasd_devices_open(struct inode *inode, struct file *file)
160 return seq_open(file, &dasd_devices_seq_ops);
163 static const struct file_operations dasd_devices_file_ops = {
164 .owner = THIS_MODULE,
165 .open = dasd_devices_open,
168 .release = seq_release,
172 dasd_calc_metrics(char *page, char **start, off_t off,
173 int count, int *eof, int len)
175 len = (len > off) ? len - off : 0;
184 #ifdef CONFIG_DASD_PROFILE
186 dasd_statistics_array(char *str, unsigned int *array, int factor)
190 for (i = 0; i < 32; i++) {
191 str += sprintf(str, "%7d ", array[i] / factor);
193 str += sprintf(str, "\n");
195 str += sprintf(str,"\n");
198 #endif /* CONFIG_DASD_PROFILE */
201 dasd_statistics_read(char *page, char **start, off_t off,
202 int count, int *eof, void *data)
205 #ifdef CONFIG_DASD_PROFILE
206 struct dasd_profile_info_t *prof;
210 /* check for active profiling */
211 if (dasd_profile_level == DASD_PROFILE_OFF) {
212 len = sprintf(page, "Statistics are off - they might be "
213 "switched on using 'echo set on > "
214 "/proc/dasd/statistics'\n");
215 return dasd_calc_metrics(page, start, off, count, eof, len);
218 prof = &dasd_global_profile;
219 /* prevent counter 'overflow' on output */
220 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
224 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
225 str += sprintf(str, "with %u sectors(512B each)\n",
226 prof->dasd_io_sects);
227 str += sprintf(str, "Scale Factor is %d\n", factor);
229 " __<4 ___8 __16 __32 __64 _128 "
230 " _256 _512 __1k __2k __4k __8k "
231 " _16k _32k _64k 128k\n");
233 " _256 _512 __1M __2M __4M __8M "
234 " _16M _32M _64M 128M 256M 512M "
235 " __1G __2G __4G " " _>4G\n");
237 str += sprintf(str, "Histogram of sizes (512B secs)\n");
238 str = dasd_statistics_array(str, prof->dasd_io_secs, factor);
239 str += sprintf(str, "Histogram of I/O times (microseconds)\n");
240 str = dasd_statistics_array(str, prof->dasd_io_times, factor);
241 str += sprintf(str, "Histogram of I/O times per sector\n");
242 str = dasd_statistics_array(str, prof->dasd_io_timps, factor);
243 str += sprintf(str, "Histogram of I/O time till ssch\n");
244 str = dasd_statistics_array(str, prof->dasd_io_time1, factor);
245 str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
246 str = dasd_statistics_array(str, prof->dasd_io_time2, factor);
247 str += sprintf(str, "Histogram of I/O time between ssch "
248 "and irq per sector\n");
249 str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor);
250 str += sprintf(str, "Histogram of I/O time between irq and end\n");
251 str = dasd_statistics_array(str, prof->dasd_io_time3, factor);
252 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
253 str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor);
256 len = sprintf(page, "Statistics are not activated in this kernel\n");
258 return dasd_calc_metrics(page, start, off, count, eof, len);
262 dasd_statistics_write(struct file *file, const char __user *user_buf,
263 unsigned long user_len, void *data)
265 #ifdef CONFIG_DASD_PROFILE
268 if (user_len > 65536)
270 buffer = dasd_get_user_string(user_buf, user_len);
272 return PTR_ERR(buffer);
273 DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
275 /* check for valid verbs */
276 str = skip_spaces(buffer);
277 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
278 /* 'set xxx' was given */
279 str = skip_spaces(str + 4);
280 if (strcmp(str, "on") == 0) {
281 /* switch on statistics profiling */
282 dasd_profile_level = DASD_PROFILE_ON;
283 pr_info("The statistics feature has been switched "
285 } else if (strcmp(str, "off") == 0) {
286 /* switch off and reset statistics profiling */
287 memset(&dasd_global_profile,
288 0, sizeof (struct dasd_profile_info_t));
289 dasd_profile_level = DASD_PROFILE_OFF;
290 pr_info("The statistics feature has been switched "
294 } else if (strncmp(str, "reset", 5) == 0) {
295 /* reset the statistics */
296 memset(&dasd_global_profile, 0,
297 sizeof (struct dasd_profile_info_t));
298 pr_info("The statistics have been reset\n");
304 pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
309 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
311 #endif /* CONFIG_DASD_PROFILE */
315 * Create dasd proc-fs entries.
316 * In case creation failed, cleanup and return -ENOENT.
321 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
322 if (!dasd_proc_root_entry)
324 dasd_devices_entry = proc_create("devices",
325 S_IFREG | S_IRUGO | S_IWUSR,
326 dasd_proc_root_entry,
327 &dasd_devices_file_ops);
328 if (!dasd_devices_entry)
330 dasd_statistics_entry = create_proc_entry("statistics",
331 S_IFREG | S_IRUGO | S_IWUSR,
332 dasd_proc_root_entry);
333 if (!dasd_statistics_entry)
334 goto out_nostatistics;
335 dasd_statistics_entry->read_proc = dasd_statistics_read;
336 dasd_statistics_entry->write_proc = dasd_statistics_write;
340 remove_proc_entry("devices", dasd_proc_root_entry);
342 remove_proc_entry("dasd", NULL);
350 remove_proc_entry("devices", dasd_proc_root_entry);
351 remove_proc_entry("statistics", dasd_proc_root_entry);
352 remove_proc_entry("dasd", NULL);