summaryrefslogtreecommitdiff
path: root/drivers/s390/block/dasd_proc.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/block/dasd_proc.c')
-rw-r--r--drivers/s390/block/dasd_proc.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c
new file mode 100644
index 000000000000..353d41118c62
--- /dev/null
+++ b/drivers/s390/block/dasd_proc.c
@@ -0,0 +1,319 @@
+/*
+ * File...........: linux/drivers/s390/block/dasd_proc.c
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ * Horst Hummel <Horst.Hummel@de.ibm.com>
+ * Carsten Otte <Cotte@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
+ *
+ * /proc interface for the dasd driver.
+ *
+ * $Revision: 1.30 $
+ */
+
+#include <linux/config.h>
+#include <linux/ctype.h>
+#include <linux/seq_file.h>
+#include <linux/vmalloc.h>
+
+#include <asm/debug.h>
+#include <asm/uaccess.h>
+
+/* This is ugly... */
+#define PRINTK_HEADER "dasd_proc:"
+
+#include "dasd_int.h"
+
+static struct proc_dir_entry *dasd_proc_root_entry = NULL;
+static struct proc_dir_entry *dasd_devices_entry = NULL;
+static struct proc_dir_entry *dasd_statistics_entry = NULL;
+
+static inline char *
+dasd_get_user_string(const char __user *user_buf, size_t user_len)
+{
+ char *buffer;
+
+ buffer = kmalloc(user_len + 1, GFP_KERNEL);
+ if (buffer == NULL)
+ return ERR_PTR(-ENOMEM);
+ if (copy_from_user(buffer, user_buf, user_len) != 0) {
+ kfree(buffer);
+ return ERR_PTR(-EFAULT);
+ }
+ /* got the string, now strip linefeed. */
+ if (buffer[user_len - 1] == '\n')
+ buffer[user_len - 1] = 0;
+ else
+ buffer[user_len] = 0;
+ return buffer;
+}
+
+static int
+dasd_devices_show(struct seq_file *m, void *v)
+{
+ struct dasd_device *device;
+ char *substr;
+
+ device = dasd_device_from_devindex((unsigned long) v - 1);
+ if (IS_ERR(device))
+ return 0;
+ /* Print device number. */
+ seq_printf(m, "%s", device->cdev->dev.bus_id);
+ /* Print discipline string. */
+ if (device != NULL && device->discipline != NULL)
+ seq_printf(m, "(%s)", device->discipline->name);
+ else
+ seq_printf(m, "(none)");
+ /* Print kdev. */
+ if (device->gdp)
+ seq_printf(m, " at (%3d:%6d)",
+ device->gdp->major, device->gdp->first_minor);
+ else
+ seq_printf(m, " at (???:??????)");
+ /* Print device name. */
+ if (device->gdp)
+ seq_printf(m, " is %-8s", device->gdp->disk_name);
+ else
+ seq_printf(m, " is ????????");
+ /* Print devices features. */
+ substr = test_bit(DASD_FLAG_RO, &device->flags) ? "(ro)" : " ";
+ seq_printf(m, "%4s: ", substr);
+ /* Print device status information. */
+ switch ((device != NULL) ? device->state : -1) {
+ case -1:
+ seq_printf(m, "unknown");
+ break;
+ case DASD_STATE_NEW:
+ seq_printf(m, "new");
+ break;
+ case DASD_STATE_KNOWN:
+ seq_printf(m, "detected");
+ break;
+ case DASD_STATE_BASIC:
+ seq_printf(m, "basic");
+ break;
+ case DASD_STATE_READY:
+ case DASD_STATE_ONLINE:
+ seq_printf(m, "active ");
+ if (dasd_check_blocksize(device->bp_block))
+ seq_printf(m, "n/f ");
+ else
+ seq_printf(m,
+ "at blocksize: %d, %ld blocks, %ld MB",
+ device->bp_block, device->blocks,
+ ((device->bp_block >> 9) *
+ device->blocks) >> 11);
+ break;
+ default:
+ seq_printf(m, "no stat");
+ break;
+ }
+ dasd_put_device(device);
+ if (dasd_probeonly)
+ seq_printf(m, "(probeonly)");
+ seq_printf(m, "\n");
+ return 0;
+}
+
+static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
+{
+ if (*pos >= dasd_max_devindex)
+ return NULL;
+ return (void *)((unsigned long) *pos + 1);
+}
+
+static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return dasd_devices_start(m, pos);
+}
+
+static void dasd_devices_stop(struct seq_file *m, void *v)
+{
+}
+
+static struct seq_operations dasd_devices_seq_ops = {
+ .start = dasd_devices_start,
+ .next = dasd_devices_next,
+ .stop = dasd_devices_stop,
+ .show = dasd_devices_show,
+};
+
+static int dasd_devices_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &dasd_devices_seq_ops);
+}
+
+static struct file_operations dasd_devices_file_ops = {
+ .open = dasd_devices_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static inline int
+dasd_calc_metrics(char *page, char **start, off_t off,
+ int count, int *eof, int len)
+{
+ len = (len > off) ? len - off : 0;
+ if (len > count)
+ len = count;
+ if (len < count)
+ *eof = 1;
+ *start = page + off;
+ return len;
+}
+
+static inline char *
+dasd_statistics_array(char *str, int *array, int shift)
+{
+ int i;
+
+ for (i = 0; i < 32; i++) {
+ str += sprintf(str, "%7d ", array[i] >> shift);
+ if (i == 15)
+ str += sprintf(str, "\n");
+ }
+ str += sprintf(str,"\n");
+ return str;
+}
+
+static int
+dasd_statistics_read(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ unsigned long len;
+#ifdef CONFIG_DASD_PROFILE
+ struct dasd_profile_info_t *prof;
+ char *str;
+ int shift;
+
+ /* check for active profiling */
+ if (dasd_profile_level == DASD_PROFILE_OFF) {
+ len = sprintf(page, "Statistics are off - they might be "
+ "switched on using 'echo set on > "
+ "/proc/dasd/statistics'\n");
+ return dasd_calc_metrics(page, start, off, count, eof, len);
+ }
+
+ prof = &dasd_global_profile;
+ /* prevent couter 'overflow' on output */
+ for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
+
+ str = page;
+ str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
+ str += sprintf(str, "with %d sectors(512B each)\n",
+ prof->dasd_io_sects);
+ str += sprintf(str,
+ " __<4 ___8 __16 __32 __64 _128 "
+ " _256 _512 __1k __2k __4k __8k "
+ " _16k _32k _64k 128k\n");
+ str += sprintf(str,
+ " _256 _512 __1M __2M __4M __8M "
+ " _16M _32M _64M 128M 256M 512M "
+ " __1G __2G __4G " " _>4G\n");
+
+ str += sprintf(str, "Histogram of sizes (512B secs)\n");
+ str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
+ str += sprintf(str, "Histogram of I/O times (microseconds)\n");
+ str = dasd_statistics_array(str, prof->dasd_io_times, shift);
+ str += sprintf(str, "Histogram of I/O times per sector\n");
+ str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
+ str += sprintf(str, "Histogram of I/O time till ssch\n");
+ str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
+ str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
+ str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
+ str += sprintf(str, "Histogram of I/O time between ssch "
+ "and irq per sector\n");
+ str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
+ str += sprintf(str, "Histogram of I/O time between irq and end\n");
+ str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
+ str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
+ str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
+ len = str - page;
+#else
+ len = sprintf(page, "Statistics are not activated in this kernel\n");
+#endif
+ return dasd_calc_metrics(page, start, off, count, eof, len);
+}
+
+static int
+dasd_statistics_write(struct file *file, const char __user *user_buf,
+ unsigned long user_len, void *data)
+{
+#ifdef CONFIG_DASD_PROFILE
+ char *buffer, *str;
+
+ if (user_len > 65536)
+ user_len = 65536;
+ buffer = dasd_get_user_string(user_buf, user_len);
+ if (IS_ERR(buffer))
+ return PTR_ERR(buffer);
+ MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
+
+ /* check for valid verbs */
+ for (str = buffer; isspace(*str); str++);
+ if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
+ /* 'set xxx' was given */
+ for (str = str + 4; isspace(*str); str++);
+ if (strcmp(str, "on") == 0) {
+ /* switch on statistics profiling */
+ dasd_profile_level = DASD_PROFILE_ON;
+ MESSAGE(KERN_INFO, "%s", "Statistics switched on");
+ } else if (strcmp(str, "off") == 0) {
+ /* switch off and reset statistics profiling */
+ memset(&dasd_global_profile,
+ 0, sizeof (struct dasd_profile_info_t));
+ dasd_profile_level = DASD_PROFILE_OFF;
+ MESSAGE(KERN_INFO, "%s", "Statistics switched off");
+ } else
+ goto out_error;
+ } else if (strncmp(str, "reset", 5) == 0) {
+ /* reset the statistics */
+ memset(&dasd_global_profile, 0,
+ sizeof (struct dasd_profile_info_t));
+ MESSAGE(KERN_INFO, "%s", "Statistics reset");
+ } else
+ goto out_error;
+ kfree(buffer);
+ return user_len;
+out_error:
+ MESSAGE(KERN_WARNING, "%s",
+ "/proc/dasd/statistics: only 'set on', 'set off' "
+ "and 'reset' are supported verbs");
+ kfree(buffer);
+ return -EINVAL;
+#else
+ MESSAGE(KERN_WARNING, "%s",
+ "/proc/dasd/statistics: is not activated in this kernel");
+ return user_len;
+#endif /* CONFIG_DASD_PROFILE */
+}
+
+int
+dasd_proc_init(void)
+{
+ dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
+ dasd_proc_root_entry->owner = THIS_MODULE;
+ dasd_devices_entry = create_proc_entry("devices",
+ S_IFREG | S_IRUGO | S_IWUSR,
+ dasd_proc_root_entry);
+ dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
+ dasd_devices_entry->owner = THIS_MODULE;
+ dasd_statistics_entry = create_proc_entry("statistics",
+ S_IFREG | S_IRUGO | S_IWUSR,
+ dasd_proc_root_entry);
+ dasd_statistics_entry->read_proc = dasd_statistics_read;
+ dasd_statistics_entry->write_proc = dasd_statistics_write;
+ dasd_statistics_entry->owner = THIS_MODULE;
+ return 0;
+}
+
+void
+dasd_proc_exit(void)
+{
+ remove_proc_entry("devices", dasd_proc_root_entry);
+ remove_proc_entry("statistics", dasd_proc_root_entry);
+ remove_proc_entry("dasd", &proc_root);
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-15 13:25:27 +0300