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acrn-kernel/drivers/scsi/scsi_proc.c

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/*
* 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 <linux/mutex.h>
#include <asm/uaccess.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.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 DEFINE_MUTEX(global_host_template_mutex);
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;
mutex_lock(&global_host_template_mutex);
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;
}
mutex_unlock(&global_host_template_mutex);
}
void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
{
if (!sht->proc_info)
return;
mutex_lock(&global_host_template_mutex);
if (!--sht->present && sht->proc_dir) {
remove_proc_entry(sht->proc_name, proc_scsi);
sht->proc_dir = NULL;
}
mutex_unlock(&global_host_template_mutex);
}
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 ", scsi_device_type(sdev->type));
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);
if (shost->transportt->user_scan)
error = shost->transportt->user_scan(shost, channel, id, lun);
else
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);
/*
* 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);
}
/*
* convert success returns so that we return the
* number of bytes consumed.
*/
if (!err)
err = length;
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);
}
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