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
9 * /proc interface for the dasd driver.
13 #define KMSG_COMPONENT "dasd"
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>
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;
35 dasd_devices_show(struct seq_file *m, void *v)
37 struct dasd_device *device;
38 struct dasd_block *block;
41 device = dasd_device_from_devindex((unsigned long) v - 1);
45 block = device->block;
47 dasd_put_device(device);
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);
56 seq_printf(m, "(none)");
59 seq_printf(m, " at (%3d:%6d)",
60 MAJOR(disk_devt(block->gdp)),
61 MINOR(disk_devt(block->gdp)));
63 seq_printf(m, " at (???:??????)");
64 /* Print device name. */
66 seq_printf(m, " is %-8s", block->gdp->disk_name);
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) {
77 case DASD_STATE_KNOWN:
78 seq_printf(m, "detected");
80 case DASD_STATE_BASIC:
81 seq_printf(m, "basic");
83 case DASD_STATE_UNFMT:
84 seq_printf(m, "unformatted");
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 ");
93 "at blocksize: %d, %lld blocks, %lld MB",
94 block->bp_block, block->blocks,
95 ((block->bp_block >> 9) *
96 block->blocks) >> 11);
99 seq_printf(m, "no stat");
102 dasd_put_device(device);
104 seq_printf(m, "(probeonly)");
109 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
111 if (*pos >= dasd_max_devindex)
113 return (void *)((unsigned long) *pos + 1);
116 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
119 return dasd_devices_start(m, pos);
122 static void dasd_devices_stop(struct seq_file *m, void *v)
126 static 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,
133 static int dasd_devices_open(struct inode *inode, struct file *file)
135 return seq_open(file, &dasd_devices_seq_ops);
138 static const struct file_operations dasd_devices_file_ops = {
139 .owner = THIS_MODULE,
140 .open = dasd_devices_open,
143 .release = seq_release,
146 #ifdef CONFIG_DASD_PROFILE
147 static int dasd_stats_all_block_on(void)
150 struct dasd_device *device;
153 for (i = 0; i < dasd_max_devindex; ++i) {
154 device = dasd_device_from_devindex(i);
158 rc = dasd_profile_on(&device->block->profile);
159 dasd_put_device(device);
166 static void dasd_stats_all_block_off(void)
169 struct dasd_device *device;
171 for (i = 0; i < dasd_max_devindex; ++i) {
172 device = dasd_device_from_devindex(i);
176 dasd_profile_off(&device->block->profile);
177 dasd_put_device(device);
181 static void dasd_stats_all_block_reset(void)
184 struct dasd_device *device;
186 for (i = 0; i < dasd_max_devindex; ++i) {
187 device = dasd_device_from_devindex(i);
191 dasd_profile_reset(&device->block->profile);
192 dasd_put_device(device);
196 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
200 for (i = 0; i < 32; i++) {
201 seq_printf(m, "%7d ", array[i] / factor);
207 #endif /* CONFIG_DASD_PROFILE */
209 static int dasd_stats_proc_show(struct seq_file *m, void *v)
211 #ifdef CONFIG_DASD_PROFILE
212 struct dasd_profile_info *prof;
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");
222 prof = &dasd_global_profile_data;
224 /* prevent counter 'overflow' on output */
225 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
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);
233 " __<4 ___8 __16 __32 __64 _128 "
234 " _256 _512 __1k __2k __4k __8k "
235 " _16k _32k _64k 128k\n");
237 " _256 _512 __1M __2M __4M __8M "
238 " _16M _32M _64M 128M 256M 512M "
239 " __1G __2G __4G " " _>4G\n");
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);
259 seq_printf(m, "Statistics are not activated in this kernel\n");
264 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
266 return single_open(file, dasd_stats_proc_show, NULL);
269 static ssize_t dasd_stats_proc_write(struct file *file,
270 const char __user *user_buf, size_t user_len, loff_t *pos)
272 #ifdef CONFIG_DASD_PROFILE
276 if (user_len > 65536)
278 buffer = dasd_get_user_string(user_buf, user_len);
280 return PTR_ERR(buffer);
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();
291 dasd_stats_all_block_off();
294 dasd_global_profile_reset();
295 dasd_global_profile_level = DASD_PROFILE_ON;
296 pr_info("The statistics feature has been switched "
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 "
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");
313 goto out_parse_error;
318 pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
324 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
326 #endif /* CONFIG_DASD_PROFILE */
329 static const struct file_operations dasd_stats_proc_fops = {
330 .owner = THIS_MODULE,
331 .open = dasd_stats_proc_open,
334 .release = single_release,
335 .write = dasd_stats_proc_write,
339 * Create dasd proc-fs entries.
340 * In case creation failed, cleanup and return -ENOENT.
345 dasd_proc_root_entry = proc_mkdir("dasd", NULL);
346 if (!dasd_proc_root_entry)
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)
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;
363 remove_proc_entry("devices", dasd_proc_root_entry);
365 remove_proc_entry("dasd", NULL);
373 remove_proc_entry("devices", dasd_proc_root_entry);
374 remove_proc_entry("statistics", dasd_proc_root_entry);
375 remove_proc_entry("dasd", NULL);