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454 lines
11 KiB
454 lines
11 KiB
/*
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* linux/drivers/scsi/scsi_proc.c
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*
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* The functions in this file provide an interface between
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* the PROC file system and the SCSI device drivers
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* It is mainly used for debugging, statistics and to pass
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* information directly to the lowlevel driver.
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*
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* (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
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* Version: 0.99.8 last change: 95/09/13
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*
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* generic command parser provided by:
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* Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
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*
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* generic_proc_info() support of xxxx_info() by:
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* Michael A. Griffith <grif@acm.org>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/proc_fs.h>
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#include <linux/errno.h>
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#include <linux/blkdev.h>
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#include <linux/seq_file.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport.h>
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#include "scsi_priv.h"
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#include "scsi_logging.h"
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/* 4K page size, but our output routines, use some slack for overruns */
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#define PROC_BLOCK_SIZE (3*1024)
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static struct proc_dir_entry *proc_scsi;
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/* Protect sht->present and sht->proc_dir */
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static DEFINE_MUTEX(global_host_template_mutex);
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/**
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* proc_scsi_read - handle read from /proc by calling host's proc_info() command
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* @buffer: passed to proc_info
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* @start: passed to proc_info
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* @offset: passed to proc_info
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* @length: passed to proc_info
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* @eof: returns whether length read was less than requested
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* @data: pointer to a &struct Scsi_Host
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*/
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static int proc_scsi_read(char *buffer, char **start, off_t offset,
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int length, int *eof, void *data)
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{
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struct Scsi_Host *shost = data;
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int n;
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n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
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*eof = (n < length);
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return n;
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}
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/**
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* proc_scsi_write_proc - Handle write to /proc by calling host's proc_info()
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* @file: not used
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* @buf: source of data to write.
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* @count: number of bytes (at most PROC_BLOCK_SIZE) to write.
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* @data: pointer to &struct Scsi_Host
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*/
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static int proc_scsi_write_proc(struct file *file, const char __user *buf,
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unsigned long count, void *data)
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{
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struct Scsi_Host *shost = data;
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ssize_t ret = -ENOMEM;
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char *page;
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char *start;
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if (count > PROC_BLOCK_SIZE)
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return -EOVERFLOW;
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page = (char *)__get_free_page(GFP_KERNEL);
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if (page) {
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ret = -EFAULT;
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if (copy_from_user(page, buf, count))
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goto out;
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ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
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}
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out:
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free_page((unsigned long)page);
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return ret;
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}
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/**
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* scsi_proc_hostdir_add - Create directory in /proc for a scsi host
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* @sht: owner of this directory
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*
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* Sets sht->proc_dir to the new directory.
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*/
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void scsi_proc_hostdir_add(struct scsi_host_template *sht)
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{
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if (!sht->proc_info)
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return;
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mutex_lock(&global_host_template_mutex);
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if (!sht->present++) {
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sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
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if (!sht->proc_dir)
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printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
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__FUNCTION__, sht->proc_name);
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else
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sht->proc_dir->owner = sht->module;
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}
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mutex_unlock(&global_host_template_mutex);
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}
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/**
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* scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
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* @sht: owner of directory
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*/
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void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
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{
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if (!sht->proc_info)
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return;
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mutex_lock(&global_host_template_mutex);
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if (!--sht->present && sht->proc_dir) {
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remove_proc_entry(sht->proc_name, proc_scsi);
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sht->proc_dir = NULL;
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}
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mutex_unlock(&global_host_template_mutex);
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}
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/**
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* scsi_proc_host_add - Add entry for this host to appropriate /proc dir
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* @shost: host to add
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*/
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void scsi_proc_host_add(struct Scsi_Host *shost)
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{
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struct scsi_host_template *sht = shost->hostt;
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struct proc_dir_entry *p;
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char name[10];
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if (!sht->proc_dir)
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return;
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sprintf(name,"%d", shost->host_no);
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p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
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sht->proc_dir, proc_scsi_read, shost);
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if (!p) {
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printk(KERN_ERR "%s: Failed to register host %d in"
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"%s\n", __FUNCTION__, shost->host_no,
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sht->proc_name);
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return;
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}
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p->write_proc = proc_scsi_write_proc;
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p->owner = sht->module;
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}
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/**
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* scsi_proc_host_rm - remove this host's entry from /proc
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* @shost: which host
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*/
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void scsi_proc_host_rm(struct Scsi_Host *shost)
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{
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char name[10];
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if (!shost->hostt->proc_dir)
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return;
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sprintf(name,"%d", shost->host_no);
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remove_proc_entry(name, shost->hostt->proc_dir);
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}
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/**
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* proc_print_scsidevice - return data about this host
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* @dev: A scsi device
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* @data: &struct seq_file to output to.
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*
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* Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type,
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* and revision.
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*/
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static int proc_print_scsidevice(struct device *dev, void *data)
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{
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struct scsi_device *sdev;
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struct seq_file *s = data;
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int i;
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if (!scsi_is_sdev_device(dev))
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goto out;
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sdev = to_scsi_device(dev);
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seq_printf(s,
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"Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
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sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
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for (i = 0; i < 8; i++) {
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if (sdev->vendor[i] >= 0x20)
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seq_printf(s, "%c", sdev->vendor[i]);
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else
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seq_printf(s, " ");
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}
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seq_printf(s, " Model: ");
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for (i = 0; i < 16; i++) {
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if (sdev->model[i] >= 0x20)
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seq_printf(s, "%c", sdev->model[i]);
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else
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seq_printf(s, " ");
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}
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seq_printf(s, " Rev: ");
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for (i = 0; i < 4; i++) {
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if (sdev->rev[i] >= 0x20)
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seq_printf(s, "%c", sdev->rev[i]);
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else
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seq_printf(s, " ");
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}
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seq_printf(s, "\n");
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seq_printf(s, " Type: %s ", scsi_device_type(sdev->type));
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seq_printf(s, " ANSI SCSI revision: %02x",
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sdev->scsi_level - (sdev->scsi_level > 1));
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if (sdev->scsi_level == 2)
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seq_printf(s, " CCS\n");
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else
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seq_printf(s, "\n");
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out:
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return 0;
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}
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/**
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* scsi_add_single_device - Respond to user request to probe for/add device
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* @host: user-supplied decimal integer
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* @channel: user-supplied decimal integer
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* @id: user-supplied decimal integer
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* @lun: user-supplied decimal integer
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*
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* Description: called by writing "scsi add-single-device" to /proc/scsi/scsi.
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*
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* does scsi_host_lookup() and either user_scan() if that transport
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* type supports it, or else scsi_scan_host_selected()
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*
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* Note: this seems to be aimed exclusively at SCSI parallel busses.
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*/
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static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
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{
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struct Scsi_Host *shost;
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int error = -ENXIO;
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shost = scsi_host_lookup(host);
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if (IS_ERR(shost))
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return PTR_ERR(shost);
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if (shost->transportt->user_scan)
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error = shost->transportt->user_scan(shost, channel, id, lun);
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else
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error = scsi_scan_host_selected(shost, channel, id, lun, 1);
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scsi_host_put(shost);
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return error;
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}
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/**
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* scsi_remove_single_device - Respond to user request to remove a device
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* @host: user-supplied decimal integer
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* @channel: user-supplied decimal integer
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* @id: user-supplied decimal integer
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* @lun: user-supplied decimal integer
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*
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* Description: called by writing "scsi remove-single-device" to
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* /proc/scsi/scsi. Does a scsi_device_lookup() and scsi_remove_device()
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*/
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static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
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{
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struct scsi_device *sdev;
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struct Scsi_Host *shost;
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int error = -ENXIO;
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shost = scsi_host_lookup(host);
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if (IS_ERR(shost))
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return PTR_ERR(shost);
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sdev = scsi_device_lookup(shost, channel, id, lun);
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if (sdev) {
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scsi_remove_device(sdev);
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scsi_device_put(sdev);
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error = 0;
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}
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scsi_host_put(shost);
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return error;
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}
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/**
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* proc_scsi_write - handle writes to /proc/scsi/scsi
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* @file: not used
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* @buf: buffer to write
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* @length: length of buf, at most PAGE_SIZE
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* @ppos: not used
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*
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* Description: this provides a legacy mechanism to add or remove devices by
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* Host, Channel, ID, and Lun. To use,
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* "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
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* "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
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* "0 1 2 3" replaced by the Host, Channel, Id, and Lun.
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*
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* Note: this seems to be aimed at parallel SCSI. Most modern busses (USB,
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* SATA, Firewire, Fibre Channel, etc) dynamically assign these values to
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* provide a unique identifier and nothing more.
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*/
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static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
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size_t length, loff_t *ppos)
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{
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int host, channel, id, lun;
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char *buffer, *p;
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int err;
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if (!buf || length > PAGE_SIZE)
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return -EINVAL;
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buffer = (char *)__get_free_page(GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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err = -EFAULT;
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if (copy_from_user(buffer, buf, length))
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goto out;
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err = -EINVAL;
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if (length < PAGE_SIZE)
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buffer[length] = '\0';
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else if (buffer[PAGE_SIZE-1])
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goto out;
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/*
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* Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
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* with "0 1 2 3" replaced by your "Host Channel Id Lun".
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*/
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if (!strncmp("scsi add-single-device", buffer, 22)) {
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p = buffer + 23;
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host = simple_strtoul(p, &p, 0);
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channel = simple_strtoul(p + 1, &p, 0);
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id = simple_strtoul(p + 1, &p, 0);
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lun = simple_strtoul(p + 1, &p, 0);
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err = scsi_add_single_device(host, channel, id, lun);
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/*
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* Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
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* with "0 1 2 3" replaced by your "Host Channel Id Lun".
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*/
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} else if (!strncmp("scsi remove-single-device", buffer, 25)) {
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p = buffer + 26;
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host = simple_strtoul(p, &p, 0);
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channel = simple_strtoul(p + 1, &p, 0);
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id = simple_strtoul(p + 1, &p, 0);
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lun = simple_strtoul(p + 1, &p, 0);
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err = scsi_remove_single_device(host, channel, id, lun);
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}
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/*
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* convert success returns so that we return the
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* number of bytes consumed.
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*/
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if (!err)
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err = length;
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out:
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free_page((unsigned long)buffer);
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return err;
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}
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/**
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* proc_scsi_show - show contents of /proc/scsi/scsi (attached devices)
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* @s: output goes here
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* @p: not used
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*/
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static int proc_scsi_show(struct seq_file *s, void *p)
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{
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seq_printf(s, "Attached devices:\n");
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bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
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return 0;
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}
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/**
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* proc_scsi_open - glue function
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* @inode: not used
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* @file: passed to single_open()
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*
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* Associates proc_scsi_show with this file
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*/
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static int proc_scsi_open(struct inode *inode, struct file *file)
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{
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/*
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* We don't really need this for the write case but it doesn't
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* harm either.
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*/
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return single_open(file, proc_scsi_show, NULL);
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}
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static const struct file_operations proc_scsi_operations = {
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.owner = THIS_MODULE,
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.open = proc_scsi_open,
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.read = seq_read,
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.write = proc_scsi_write,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/**
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* scsi_init_procfs - create scsi and scsi/scsi in procfs
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*/
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int __init scsi_init_procfs(void)
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{
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struct proc_dir_entry *pde;
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proc_scsi = proc_mkdir("scsi", NULL);
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if (!proc_scsi)
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goto err1;
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pde = proc_create("scsi/scsi", 0, NULL, &proc_scsi_operations);
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if (!pde)
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goto err2;
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return 0;
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err2:
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remove_proc_entry("scsi", NULL);
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err1:
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return -ENOMEM;
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}
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/**
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* scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
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*/
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void scsi_exit_procfs(void)
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{
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remove_proc_entry("scsi/scsi", NULL);
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remove_proc_entry("scsi", NULL);
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}
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