/* * 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/proc_fs.h> #include <linux/errno.h> #include <linux/blkdev.h> #include <linux/seq_file.h> #include <linux/mutex.h> #include <linux/gfp.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); /** * proc_scsi_read - handle read from /proc by calling host's proc_info() command * @buffer: passed to proc_info * @start: passed to proc_info * @offset: passed to proc_info * @length: passed to proc_info * @eof: returns whether length read was less than requested * @data: pointer to a &struct Scsi_Host */ 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; } /** * proc_scsi_write_proc - Handle write to /proc by calling host's proc_info() * @file: not used * @buf: source of data to write. * @count: number of bytes (at most PROC_BLOCK_SIZE) to write. * @data: pointer to &struct Scsi_Host */ 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; } /** * scsi_proc_hostdir_add - Create directory in /proc for a scsi host * @sht: owner of this directory * * Sets sht->proc_dir to the new directory. */ 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", __func__, sht->proc_name); } mutex_unlock(&global_host_template_mutex); } /** * scsi_proc_hostdir_rm - remove directory in /proc for a scsi host * @sht: owner of directory */ 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); } /** * scsi_proc_host_add - Add entry for this host to appropriate /proc dir * @shost: host to add */ 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", __func__, shost->host_no, sht->proc_name); return; } p->write_proc = proc_scsi_write_proc; } /** * scsi_proc_host_rm - remove this host's entry from /proc * @shost: which host */ 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); } /** * proc_print_scsidevice - return data about this host * @dev: A scsi device * @data: &struct seq_file to output to. * * Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type, * and revision. */ static int proc_print_scsidevice(struct device *dev, void *data) { struct scsi_device *sdev; struct seq_file *s = data; int i; if (!scsi_is_sdev_device(dev)) goto out; sdev = to_scsi_device(dev); 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 - (sdev->scsi_level > 1)); if (sdev->scsi_level == 2) seq_printf(s, " CCS\n"); else seq_printf(s, "\n"); out: return 0; } /** * scsi_add_single_device - Respond to user request to probe for/add device * @host: user-supplied decimal integer * @channel: user-supplied decimal integer * @id: user-supplied decimal integer * @lun: user-supplied decimal integer * * Description: called by writing "scsi add-single-device" to /proc/scsi/scsi. * * does scsi_host_lookup() and either user_scan() if that transport * type supports it, or else scsi_scan_host_selected() * * Note: this seems to be aimed exclusively at SCSI parallel busses. */ 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 (!shost) return error; 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; } /** * scsi_remove_single_device - Respond to user request to remove a device * @host: user-supplied decimal integer * @channel: user-supplied decimal integer * @id: user-supplied decimal integer * @lun: user-supplied decimal integer * * Description: called by writing "scsi remove-single-device" to * /proc/scsi/scsi. Does a scsi_device_lookup() and scsi_remove_device() */ 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 (!shost) return error; 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; } /** * proc_scsi_write - handle writes to /proc/scsi/scsi * @file: not used * @buf: buffer to write * @length: length of buf, at most PAGE_SIZE * @ppos: not used * * Description: this provides a legacy mechanism to add or remove devices by * Host, Channel, ID, and Lun. To use, * "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or * "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with * "0 1 2 3" replaced by the Host, Channel, Id, and Lun. * * Note: this seems to be aimed at parallel SCSI. Most modern busses (USB, * SATA, Firewire, Fibre Channel, etc) dynamically assign these values to * provide a unique identifier and nothing more. */ 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; } /** * proc_scsi_show - show contents of /proc/scsi/scsi (attached devices) * @s: output goes here * @p: not used */ 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; } /** * proc_scsi_open - glue function * @inode: not used * @file: passed to single_open() * * Associates proc_scsi_show with this file */ static int proc_scsi_open(struct inode *inode, struct file *file) { /* * We don't really need this for the write case but it doesn't * harm either. */ return single_open(file, proc_scsi_show, NULL); } static const struct file_operations proc_scsi_operations = { .owner = THIS_MODULE, .open = proc_scsi_open, .read = seq_read, .write = proc_scsi_write, .llseek = seq_lseek, .release = single_release, }; /** * scsi_init_procfs - create scsi and scsi/scsi in procfs */ int __init scsi_init_procfs(void) { struct proc_dir_entry *pde; proc_scsi = proc_mkdir("scsi", NULL); if (!proc_scsi) goto err1; pde = proc_create("scsi/scsi", 0, NULL, &proc_scsi_operations); if (!pde) goto err2; return 0; err2: remove_proc_entry("scsi", NULL); err1: return -ENOMEM; } /** * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs */ void scsi_exit_procfs(void) { remove_proc_entry("scsi/scsi", NULL); remove_proc_entry("scsi", NULL); }