diff options
Diffstat (limited to 'drivers/scsi/scsi_proc.c')
| -rw-r--r-- | drivers/scsi/scsi_proc.c | 336 |
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); +} |