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->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->state) {
99 case DASD_STATE_KNOWN:
100 seq_printf(m, "detected");
102 case DASD_STATE_BASIC:
103 seq_printf(m, "basic");
105 case DASD_STATE_UNFMT:
106 seq_printf(m, "unformatted");
108 case DASD_STATE_READY:
109 case DASD_STATE_ONLINE:
110 seq_printf(m, "active ");
111 if (dasd_check_blocksize(block->bp_block))
112 seq_printf(m, "n/f ");
115 "at blocksize: %d, %lld blocks, %lld MB",
116 block->bp_block, block->blocks,
117 ((block->bp_block >> 9) *
118 block->blocks) >> 11);
121 seq_printf(m, "no stat");
124 dasd_put_device(device);
126 seq_printf(m, "(probeonly)");
131 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
133 if (*pos >= dasd_max_devindex)
135 return (void *)((unsigned long) *pos + 1);
138 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
141 return dasd_devices_start(m, pos);
144 static void dasd_devices_stop(struct seq_file *m, void *v)
148 static const struct seq_operations dasd_devices_seq_ops = {
149 .start = dasd_devices_start,
150 .next = dasd_devices_next,
151 .stop = dasd_devices_stop,
152 .show = dasd_devices_show,
155 static int dasd_devices_open(struct inode *inode, struct file *file)
157 return seq_open(file, &dasd_devices_seq_ops);
160 static const struct file_operations dasd_devices_file_ops = {
161 .owner = THIS_MODULE,
162 .open = dasd_devices_open,
165 .release = seq_release,
169 dasd_calc_metrics(char *page, char **start, off_t off,
170 int count, int *eof, int len)
172 len = (len > off) ? len - off : 0;
181 #ifdef CONFIG_DASD_PROFILE
183 dasd_statistics_array(char *str, unsigned int *array, int factor)
187 for (i = 0; i < 32; i++) {
188 str += sprintf(str, "%7d ", array[i] / factor);
190 str += sprintf(str, "\n");
192 str += sprintf(str,"\n");
195 #endif /* CONFIG_DASD_PROFILE */
198 dasd_statistics_read(char *page, char **start, off_t off,
199 int count, int *eof, void *data)
202 #ifdef CONFIG_DASD_PROFILE
203 struct dasd_profile_info_t *prof;
207 /* check for active profiling */
208 if (dasd_profile_level == DASD_PROFILE_OFF) {
209 len = sprintf(page, "Statistics are off - they might be "
210 "switched on using 'echo set on > "
211 "/proc/dasd/statistics'\n");
212 return dasd_calc_metrics(page, start, off, count, eof, len);
215 prof = &dasd_global_profile;
216 /* prevent counter 'overflow' on output */
217 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
221 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
222 str += sprintf(str, "with %u sectors(512B each)\n",
223 prof->dasd_io_sects);
224 str += sprintf(str, "Scale Factor is %d\n", factor);
226 " __<4 ___8 __16 __32 __64 _128 "
227 " _256 _512 __1k __2k __4k __8k "
228 " _16k _32k _64k 128k\n");
230 " _256 _512 __1M __2M __4M __8M "
231 " _16M _32M _64M 128M 256M 512M "
232 " __1G __2G __4G " " _>4G\n");
234 str += sprintf(str, "Histogram of sizes (512B secs)\n");
235 str = dasd_statistics_array(str, prof->dasd_io_secs, factor);
236 str += sprintf(str, "Histogram of I/O times (microseconds)\n");
237 str = dasd_statistics_array(str, prof->dasd_io_times, factor);
238 str += sprintf(str, "Histogram of I/O times per sector\n");
239 str = dasd_statistics_array(str, prof->dasd_io_timps, factor);
240 str += sprintf(str, "Histogram of I/O time till ssch\n");
241 str = dasd_statistics_array(str, prof->dasd_io_time1, factor);
242 str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
243 str = dasd_statistics_array(str, prof->dasd_io_time2, factor);
244 str += sprintf(str, "Histogram of I/O time between ssch "
245 "and irq per sector\n");
246 str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor);
247 str += sprintf(str, "Histogram of I/O time between irq and end\n");
248 str = dasd_statistics_array(str, prof->dasd_io_time3, factor);
249 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
250 str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor);
253 len = sprintf(page, "Statistics are not activated in this kernel\n");
255 return dasd_calc_metrics(page, start, off, count, eof, len);
259 dasd_statistics_write(struct file *file, const char __user *user_buf,
260 unsigned long user_len, void *data)
262 #ifdef CONFIG_DASD_PROFILE
265 if (user_len > 65536)
267 buffer = dasd_get_user_string(user_buf, user_len);
269 return PTR_ERR(buffer);
270 DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
272 /* check for valid verbs */
273 str = skip_spaces(buffer);
274 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
275 /* 'set xxx' was given */
276 str = skip_spaces(str + 4);
277 if (strcmp(str, "on") == 0) {
278 /* switch on statistics profiling */
279 dasd_profile_level = DASD_PROFILE_ON;
280 pr_info("The statistics feature has been switched "
282 } else if (strcmp(str, "off") == 0) {
283 /* switch off and reset statistics profiling */
284 memset(&dasd_global_profile,
285 0, sizeof (struct dasd_profile_info_t));
286 dasd_profile_level = DASD_PROFILE_OFF;
287 pr_info("The statistics feature has been switched "
291 } else if (strncmp(str, "reset", 5) == 0) {
292 /* reset the statistics */
293 memset(&dasd_global_profile, 0,
294 sizeof (struct dasd_profile_info_t));
295 pr_info("The statistics have been reset\n");
301 pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
306 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
308 #endif /* CONFIG_DASD_PROFILE */
312 * Create dasd proc-fs entries.
313 * In case creation failed, cleanup and return -ENOENT.
318 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
319 if (!dasd_proc_root_entry)
321 dasd_devices_entry = proc_create("devices",
322 S_IFREG | S_IRUGO | S_IWUSR,
323 dasd_proc_root_entry,
324 &dasd_devices_file_ops);
325 if (!dasd_devices_entry)
327 dasd_statistics_entry = create_proc_entry("statistics",
328 S_IFREG | S_IRUGO | S_IWUSR,
329 dasd_proc_root_entry);
330 if (!dasd_statistics_entry)
331 goto out_nostatistics;
332 dasd_statistics_entry->read_proc = dasd_statistics_read;
333 dasd_statistics_entry->write_proc = dasd_statistics_write;
337 remove_proc_entry("devices", dasd_proc_root_entry);
339 remove_proc_entry("dasd", NULL);
347 remove_proc_entry("devices", dasd_proc_root_entry);
348 remove_proc_entry("statistics", dasd_proc_root_entry);
349 remove_proc_entry("dasd", NULL);