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Diffstat (limited to 'drivers/s390/block/dasd_proc.c')
-rw-r--r--drivers/s390/block/dasd_proc.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c
new file mode 100644
index 000000000..62a859ea6
--- /dev/null
+++ b/drivers/s390/block/dasd_proc.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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>
+ * Copyright IBM Corp. 1999, 2002
+ *
+ * /proc interface for the dasd driver.
+ *
+ */
+
+#define KMSG_COMPONENT "dasd"
+
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/seq_file.h>
+#include <linux/vmalloc.h>
+#include <linux/proc_fs.h>
+
+#include <asm/debug.h>
+#include <linux/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 int
+dasd_devices_show(struct seq_file *m, void *v)
+{
+ struct dasd_device *device;
+ struct dasd_block *block;
+ char *substr;
+
+ device = dasd_device_from_devindex((unsigned long) v - 1);
+ if (IS_ERR(device))
+ return 0;
+ if (device->block)
+ block = device->block;
+ else {
+ dasd_put_device(device);
+ return 0;
+ }
+ /* Print device number. */
+ seq_printf(m, "%s", dev_name(&device->cdev->dev));
+ /* Print discipline string. */
+ if (device->discipline != NULL)
+ seq_printf(m, "(%s)", device->discipline->name);
+ else
+ seq_printf(m, "(none)");
+ /* Print kdev. */
+ if (block->gdp)
+ seq_printf(m, " at (%3d:%6d)",
+ MAJOR(disk_devt(block->gdp)),
+ MINOR(disk_devt(block->gdp)));
+ else
+ seq_printf(m, " at (???:??????)");
+ /* Print device name. */
+ if (block->gdp)
+ seq_printf(m, " is %-8s", block->gdp->disk_name);
+ else
+ seq_printf(m, " is ????????");
+ /* Print devices features. */
+ substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
+ seq_printf(m, "%4s: ", substr);
+ /* Print device status information. */
+ switch (device->state) {
+ 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_UNFMT:
+ seq_printf(m, "unformatted");
+ break;
+ case DASD_STATE_READY:
+ case DASD_STATE_ONLINE:
+ seq_printf(m, "active ");
+ if (dasd_check_blocksize(block->bp_block))
+ seq_printf(m, "n/f ");
+ else
+ seq_printf(m,
+ "at blocksize: %u, %lu blocks, %lu MB",
+ block->bp_block, block->blocks,
+ ((block->bp_block >> 9) *
+ block->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 const struct seq_operations dasd_devices_seq_ops = {
+ .start = dasd_devices_start,
+ .next = dasd_devices_next,
+ .stop = dasd_devices_stop,
+ .show = dasd_devices_show,
+};
+
+#ifdef CONFIG_DASD_PROFILE
+static int dasd_stats_all_block_on(void)
+{
+ int i, rc;
+ struct dasd_device *device;
+
+ rc = 0;
+ for (i = 0; i < dasd_max_devindex; ++i) {
+ device = dasd_device_from_devindex(i);
+ if (IS_ERR(device))
+ continue;
+ if (device->block)
+ rc = dasd_profile_on(&device->block->profile);
+ dasd_put_device(device);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+static void dasd_stats_all_block_off(void)
+{
+ int i;
+ struct dasd_device *device;
+
+ for (i = 0; i < dasd_max_devindex; ++i) {
+ device = dasd_device_from_devindex(i);
+ if (IS_ERR(device))
+ continue;
+ if (device->block)
+ dasd_profile_off(&device->block->profile);
+ dasd_put_device(device);
+ }
+}
+
+static void dasd_stats_all_block_reset(void)
+{
+ int i;
+ struct dasd_device *device;
+
+ for (i = 0; i < dasd_max_devindex; ++i) {
+ device = dasd_device_from_devindex(i);
+ if (IS_ERR(device))
+ continue;
+ if (device->block)
+ dasd_profile_reset(&device->block->profile);
+ dasd_put_device(device);
+ }
+}
+
+static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
+{
+ int i;
+
+ for (i = 0; i < 32; i++) {
+ seq_printf(m, "%7d ", array[i] / factor);
+ if (i == 15)
+ seq_putc(m, '\n');
+ }
+ seq_putc(m, '\n');
+}
+#endif /* CONFIG_DASD_PROFILE */
+
+static int dasd_stats_proc_show(struct seq_file *m, void *v)
+{
+#ifdef CONFIG_DASD_PROFILE
+ struct dasd_profile_info *prof;
+ int factor;
+
+ spin_lock_bh(&dasd_global_profile.lock);
+ prof = dasd_global_profile.data;
+ if (!prof) {
+ spin_unlock_bh(&dasd_global_profile.lock);
+ seq_printf(m, "Statistics are off - they might be "
+ "switched on using 'echo set on > "
+ "/proc/dasd/statistics'\n");
+ return 0;
+ }
+
+ /* prevent counter 'overflow' on output */
+ for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
+ factor *= 10);
+
+ seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
+ seq_printf(m, "with %u sectors(512B each)\n",
+ prof->dasd_io_sects);
+ seq_printf(m, "Scale Factor is %d\n", factor);
+ seq_printf(m,
+ " __<4 ___8 __16 __32 __64 _128 "
+ " _256 _512 __1k __2k __4k __8k "
+ " _16k _32k _64k 128k\n");
+ seq_printf(m,
+ " _256 _512 __1M __2M __4M __8M "
+ " _16M _32M _64M 128M 256M 512M "
+ " __1G __2G __4G " " _>4G\n");
+
+ seq_printf(m, "Histogram of sizes (512B secs)\n");
+ dasd_statistics_array(m, prof->dasd_io_secs, factor);
+ seq_printf(m, "Histogram of I/O times (microseconds)\n");
+ dasd_statistics_array(m, prof->dasd_io_times, factor);
+ seq_printf(m, "Histogram of I/O times per sector\n");
+ dasd_statistics_array(m, prof->dasd_io_timps, factor);
+ seq_printf(m, "Histogram of I/O time till ssch\n");
+ dasd_statistics_array(m, prof->dasd_io_time1, factor);
+ seq_printf(m, "Histogram of I/O time between ssch and irq\n");
+ dasd_statistics_array(m, prof->dasd_io_time2, factor);
+ seq_printf(m, "Histogram of I/O time between ssch "
+ "and irq per sector\n");
+ dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
+ seq_printf(m, "Histogram of I/O time between irq and end\n");
+ dasd_statistics_array(m, prof->dasd_io_time3, factor);
+ seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
+ dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
+ spin_unlock_bh(&dasd_global_profile.lock);
+#else
+ seq_printf(m, "Statistics are not activated in this kernel\n");
+#endif
+ return 0;
+}
+
+static int dasd_stats_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dasd_stats_proc_show, NULL);
+}
+
+static ssize_t dasd_stats_proc_write(struct file *file,
+ const char __user *user_buf, size_t user_len, loff_t *pos)
+{
+#ifdef CONFIG_DASD_PROFILE
+ char *buffer, *str;
+ int rc;
+
+ if (user_len > 65536)
+ user_len = 65536;
+ buffer = dasd_get_user_string(user_buf, user_len);
+ if (IS_ERR(buffer))
+ return PTR_ERR(buffer);
+
+ /* check for valid verbs */
+ str = skip_spaces(buffer);
+ if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
+ /* 'set xxx' was given */
+ str = skip_spaces(str + 4);
+ if (strcmp(str, "on") == 0) {
+ /* switch on statistics profiling */
+ rc = dasd_stats_all_block_on();
+ if (rc) {
+ dasd_stats_all_block_off();
+ goto out_error;
+ }
+ rc = dasd_profile_on(&dasd_global_profile);
+ if (rc) {
+ dasd_stats_all_block_off();
+ goto out_error;
+ }
+ dasd_profile_reset(&dasd_global_profile);
+ dasd_global_profile_level = DASD_PROFILE_ON;
+ pr_info("The statistics feature has been switched "
+ "on\n");
+ } else if (strcmp(str, "off") == 0) {
+ /* switch off statistics profiling */
+ dasd_global_profile_level = DASD_PROFILE_OFF;
+ dasd_profile_off(&dasd_global_profile);
+ dasd_stats_all_block_off();
+ pr_info("The statistics feature has been switched "
+ "off\n");
+ } else
+ goto out_parse_error;
+ } else if (strncmp(str, "reset", 5) == 0) {
+ /* reset the statistics */
+ dasd_profile_reset(&dasd_global_profile);
+ dasd_stats_all_block_reset();
+ pr_info("The statistics have been reset\n");
+ } else
+ goto out_parse_error;
+ vfree(buffer);
+ return user_len;
+out_parse_error:
+ rc = -EINVAL;
+ pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
+out_error:
+ vfree(buffer);
+ return rc;
+#else
+ pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
+ return user_len;
+#endif /* CONFIG_DASD_PROFILE */
+}
+
+static const struct proc_ops dasd_stats_proc_ops = {
+ .proc_open = dasd_stats_proc_open,
+ .proc_read = seq_read,
+ .proc_lseek = seq_lseek,
+ .proc_release = single_release,
+ .proc_write = dasd_stats_proc_write,
+};
+
+/*
+ * Create dasd proc-fs entries.
+ * In case creation failed, cleanup and return -ENOENT.
+ */
+int
+dasd_proc_init(void)
+{
+ dasd_proc_root_entry = proc_mkdir("dasd", NULL);
+ if (!dasd_proc_root_entry)
+ goto out_nodasd;
+ dasd_devices_entry = proc_create_seq("devices", 0444,
+ dasd_proc_root_entry,
+ &dasd_devices_seq_ops);
+ if (!dasd_devices_entry)
+ goto out_nodevices;
+ dasd_statistics_entry = proc_create("statistics",
+ S_IFREG | S_IRUGO | S_IWUSR,
+ dasd_proc_root_entry,
+ &dasd_stats_proc_ops);
+ if (!dasd_statistics_entry)
+ goto out_nostatistics;
+ return 0;
+
+ out_nostatistics:
+ remove_proc_entry("devices", dasd_proc_root_entry);
+ out_nodevices:
+ remove_proc_entry("dasd", NULL);
+ out_nodasd:
+ return -ENOENT;
+}
+
+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", NULL);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 00:44:29 +0000