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477 lines
11 KiB
477 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 [email protected] |
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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 <[email protected]> |
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* |
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* generic_proc_info() support of xxxx_info() by: |
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* Michael A. Griffith <[email protected]> |
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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/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 <linux/gfp.h> |
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#include <linux/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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static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct Scsi_Host *shost = PDE_DATA(file_inode(file)); |
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ssize_t ret = -ENOMEM; |
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char *page; |
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if (count > PROC_BLOCK_SIZE) |
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return -EOVERFLOW; |
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if (!shost->hostt->write_info) |
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return -EINVAL; |
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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->write_info(shost, page, count); |
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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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static int proc_scsi_show(struct seq_file *m, void *v) |
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{ |
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struct Scsi_Host *shost = m->private; |
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return shost->hostt->show_info(m, shost); |
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} |
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static int proc_scsi_host_open(struct inode *inode, struct file *file) |
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{ |
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return single_open_size(file, proc_scsi_show, PDE_DATA(inode), |
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4 * PAGE_SIZE); |
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} |
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static const struct proc_ops proc_scsi_ops = { |
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.proc_open = proc_scsi_host_open, |
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.proc_release = single_release, |
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.proc_read = seq_read, |
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.proc_lseek = seq_lseek, |
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.proc_write = proc_scsi_host_write |
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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->show_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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__func__, sht->proc_name); |
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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->show_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 = proc_create_data(name, S_IRUGO | S_IWUSR, |
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sht->proc_dir, &proc_scsi_ops, 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", __func__, shost->host_no, |
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sht->proc_name); |
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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: %02llu\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_putc(s, sdev->vendor[i]); |
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else |
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seq_putc(s, ' '); |
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} |
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seq_puts(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_putc(s, sdev->model[i]); |
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else |
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seq_putc(s, ' '); |
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} |
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seq_puts(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_putc(s, sdev->rev[i]); |
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else |
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seq_putc(s, ' '); |
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} |
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seq_putc(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_puts(s, " CCS\n"); |
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else |
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seq_putc(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 (!shost) |
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return error; |
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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, |
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SCSI_SCAN_MANUAL); |
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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 (!shost) |
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return error; |
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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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static inline struct device *next_scsi_device(struct device *start) |
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{ |
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struct device *next = bus_find_next_device(&scsi_bus_type, start); |
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put_device(start); |
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return next; |
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} |
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static void *scsi_seq_start(struct seq_file *sfile, loff_t *pos) |
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{ |
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struct device *dev = NULL; |
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loff_t n = *pos; |
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while ((dev = next_scsi_device(dev))) { |
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if (!n--) |
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break; |
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sfile->private++; |
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} |
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return dev; |
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} |
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static void *scsi_seq_next(struct seq_file *sfile, void *v, loff_t *pos) |
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{ |
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(*pos)++; |
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sfile->private++; |
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return next_scsi_device(v); |
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} |
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static void scsi_seq_stop(struct seq_file *sfile, void *v) |
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{ |
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put_device(v); |
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} |
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static int scsi_seq_show(struct seq_file *sfile, void *dev) |
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{ |
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if (!sfile->private) |
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seq_puts(sfile, "Attached devices:\n"); |
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return proc_print_scsidevice(dev, sfile); |
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} |
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static const struct seq_operations scsi_seq_ops = { |
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.start = scsi_seq_start, |
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.next = scsi_seq_next, |
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.stop = scsi_seq_stop, |
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.show = scsi_seq_show |
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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 seq_open(file, &scsi_seq_ops); |
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} |
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static const struct proc_ops scsi_scsi_proc_ops = { |
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.proc_open = proc_scsi_open, |
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.proc_read = seq_read, |
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.proc_write = proc_scsi_write, |
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.proc_lseek = seq_lseek, |
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.proc_release = seq_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, &scsi_scsi_proc_ops); |
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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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