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path: root/drivers/scsi/scsi_proc.c
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Diffstat (limited to 'drivers/scsi/scsi_proc.c')
-rw-r--r--drivers/scsi/scsi_proc.c336
1 files changed, 336 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c
new file mode 100644
index 000000000000..a50958b1b6ee
--- /dev/null
+++ b/drivers/scsi/scsi_proc.c
@@ -0,0 +1,336 @@
+/*
+ * linux/drivers/scsi/scsi_proc.c
+ *
+ * The functions in this file provide an interface between
+ * the PROC file system and the SCSI device drivers
+ * It is mainly used for debugging, statistics and to pass
+ * information directly to the lowlevel driver.
+ *
+ * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
+ * Version: 0.99.8 last change: 95/09/13
+ *
+ * generic command parser provided by:
+ * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
+ *
+ * generic_proc_info() support of xxxx_info() by:
+ * Michael A. Griffith <grif@acm.org>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+
+#include "scsi_priv.h"
+#include "scsi_logging.h"
+
+
+/* 4K page size, but our output routines, use some slack for overruns */
+#define PROC_BLOCK_SIZE (3*1024)
+
+static struct proc_dir_entry *proc_scsi;
+
+/* Protect sht->present and sht->proc_dir */
+static DECLARE_MUTEX(global_host_template_sem);
+
+static int proc_scsi_read(char *buffer, char **start, off_t offset,
+ int length, int *eof, void *data)
+{
+ struct Scsi_Host *shost = data;
+ int n;
+
+ n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
+ *eof = (n < length);
+
+ return n;
+}
+
+static int proc_scsi_write_proc(struct file *file, const char __user *buf,
+ unsigned long count, void *data)
+{
+ struct Scsi_Host *shost = data;
+ ssize_t ret = -ENOMEM;
+ char *page;
+ char *start;
+
+ if (count > PROC_BLOCK_SIZE)
+ return -EOVERFLOW;
+
+ page = (char *)__get_free_page(GFP_KERNEL);
+ if (page) {
+ ret = -EFAULT;
+ if (copy_from_user(page, buf, count))
+ goto out;
+ ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
+ }
+out:
+ free_page((unsigned long)page);
+ return ret;
+}
+
+void scsi_proc_hostdir_add(struct scsi_host_template *sht)
+{
+ if (!sht->proc_info)
+ return;
+
+ down(&global_host_template_sem);
+ if (!sht->present++) {
+ sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
+ if (!sht->proc_dir)
+ printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
+ __FUNCTION__, sht->proc_name);
+ else
+ sht->proc_dir->owner = sht->module;
+ }
+ up(&global_host_template_sem);
+}
+
+void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
+{
+ if (!sht->proc_info)
+ return;
+
+ down(&global_host_template_sem);
+ if (!--sht->present && sht->proc_dir) {
+ remove_proc_entry(sht->proc_name, proc_scsi);
+ sht->proc_dir = NULL;
+ }
+ up(&global_host_template_sem);
+}
+
+void scsi_proc_host_add(struct Scsi_Host *shost)
+{
+ struct scsi_host_template *sht = shost->hostt;
+ struct proc_dir_entry *p;
+ char name[10];
+
+ if (!sht->proc_dir)
+ return;
+
+ sprintf(name,"%d", shost->host_no);
+ p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
+ sht->proc_dir, proc_scsi_read, shost);
+ if (!p) {
+ printk(KERN_ERR "%s: Failed to register host %d in"
+ "%s\n", __FUNCTION__, shost->host_no,
+ sht->proc_name);
+ return;
+ }
+
+ p->write_proc = proc_scsi_write_proc;
+ p->owner = sht->module;
+}
+
+void scsi_proc_host_rm(struct Scsi_Host *shost)
+{
+ char name[10];
+
+ if (!shost->hostt->proc_dir)
+ return;
+
+ sprintf(name,"%d", shost->host_no);
+ remove_proc_entry(name, shost->hostt->proc_dir);
+}
+
+static int proc_print_scsidevice(struct device *dev, void *data)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct seq_file *s = data;
+ int i;
+
+ seq_printf(s,
+ "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
+ sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
+ for (i = 0; i < 8; i++) {
+ if (sdev->vendor[i] >= 0x20)
+ seq_printf(s, "%c", sdev->vendor[i]);
+ else
+ seq_printf(s, " ");
+ }
+
+ seq_printf(s, " Model: ");
+ for (i = 0; i < 16; i++) {
+ if (sdev->model[i] >= 0x20)
+ seq_printf(s, "%c", sdev->model[i]);
+ else
+ seq_printf(s, " ");
+ }
+
+ seq_printf(s, " Rev: ");
+ for (i = 0; i < 4; i++) {
+ if (sdev->rev[i] >= 0x20)
+ seq_printf(s, "%c", sdev->rev[i]);
+ else
+ seq_printf(s, " ");
+ }
+
+ seq_printf(s, "\n");
+
+ seq_printf(s, " Type: %s ",
+ sdev->type < MAX_SCSI_DEVICE_CODE ?
+ scsi_device_types[(int) sdev->type] : "Unknown ");
+ seq_printf(s, " ANSI"
+ " SCSI revision: %02x", (sdev->scsi_level - 1) ?
+ sdev->scsi_level - 1 : 1);
+ if (sdev->scsi_level == 2)
+ seq_printf(s, " CCS\n");
+ else
+ seq_printf(s, "\n");
+
+ return 0;
+}
+
+static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
+{
+ struct Scsi_Host *shost;
+ int error = -ENXIO;
+
+ shost = scsi_host_lookup(host);
+ if (IS_ERR(shost))
+ return PTR_ERR(shost);
+
+ error = scsi_scan_host_selected(shost, channel, id, lun, 1);
+ scsi_host_put(shost);
+ return error;
+}
+
+static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
+{
+ struct scsi_device *sdev;
+ struct Scsi_Host *shost;
+ int error = -ENXIO;
+
+ shost = scsi_host_lookup(host);
+ if (IS_ERR(shost))
+ return PTR_ERR(shost);
+ sdev = scsi_device_lookup(shost, channel, id, lun);
+ if (sdev) {
+ scsi_remove_device(sdev);
+ scsi_device_put(sdev);
+ error = 0;
+ }
+
+ scsi_host_put(shost);
+ return error;
+}
+
+static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
+ size_t length, loff_t *ppos)
+{
+ int host, channel, id, lun;
+ char *buffer, *p;
+ int err;
+
+ if (!buf || length > PAGE_SIZE)
+ return -EINVAL;
+
+ buffer = (char *)__get_free_page(GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ err = -EFAULT;
+ if (copy_from_user(buffer, buf, length))
+ goto out;
+
+ err = -EINVAL;
+ if (length < PAGE_SIZE)
+ buffer[length] = '\0';
+ else if (buffer[PAGE_SIZE-1])
+ goto out;
+
+ /*
+ * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
+ * with "0 1 2 3" replaced by your "Host Channel Id Lun".
+ */
+ if (!strncmp("scsi add-single-device", buffer, 22)) {
+ p = buffer + 23;
+
+ host = simple_strtoul(p, &p, 0);
+ channel = simple_strtoul(p + 1, &p, 0);
+ id = simple_strtoul(p + 1, &p, 0);
+ lun = simple_strtoul(p + 1, &p, 0);
+
+ err = scsi_add_single_device(host, channel, id, lun);
+ if (err >= 0)
+ err = length;
+
+ /*
+ * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
+ * with "0 1 2 3" replaced by your "Host Channel Id Lun".
+ */
+ } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
+ p = buffer + 26;
+
+ host = simple_strtoul(p, &p, 0);
+ channel = simple_strtoul(p + 1, &p, 0);
+ id = simple_strtoul(p + 1, &p, 0);
+ lun = simple_strtoul(p + 1, &p, 0);
+
+ err = scsi_remove_single_device(host, channel, id, lun);
+ }
+
+ out:
+ free_page((unsigned long)buffer);
+ return err;
+}
+
+static int proc_scsi_show(struct seq_file *s, void *p)
+{
+ seq_printf(s, "Attached devices:\n");
+ bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
+ return 0;
+}
+
+static int proc_scsi_open(struct inode *inode, struct file *file)
+{
+ /*
+ * We don't really needs this for the write case but it doesn't
+ * harm either.
+ */
+ return single_open(file, proc_scsi_show, NULL);
+}
+
+static struct file_operations proc_scsi_operations = {
+ .open = proc_scsi_open,
+ .read = seq_read,
+ .write = proc_scsi_write,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+int __init scsi_init_procfs(void)
+{
+ struct proc_dir_entry *pde;
+
+ proc_scsi = proc_mkdir("scsi", NULL);
+ if (!proc_scsi)
+ goto err1;
+
+ pde = create_proc_entry("scsi/scsi", 0, NULL);
+ if (!pde)
+ goto err2;
+ pde->proc_fops = &proc_scsi_operations;
+
+ return 0;
+
+err2:
+ remove_proc_entry("scsi", NULL);
+err1:
+ return -ENOMEM;
+}
+
+void scsi_exit_procfs(void)
+{
+ remove_proc_entry("scsi/scsi", NULL);
+ remove_proc_entry("scsi", NULL);
+}