2 * linux/drivers/scsi/scsi_proc.c
4 * The functions in this file provide an interface between
5 * the PROC file system and the SCSI device drivers
6 * It is mainly used for debugging, statistics and to pass
7 * information directly to the lowlevel driver.
9 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
10 * Version: 0.99.8 last change: 95/09/13
12 * generic command parser provided by:
13 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
15 * generic_proc_info() support of xxxx_info() by:
16 * Michael A. Griffith <grif@acm.org>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/proc_fs.h>
25 #include <linux/errno.h>
26 #include <linux/blkdev.h>
27 #include <linux/seq_file.h>
28 #include <asm/uaccess.h>
30 #include <scsi/scsi_host.h>
33 #include "scsi_priv.h"
34 #include "scsi_logging.h"
37 /* 4K page size, but our output routines, use some slack for overruns */
38 #define PROC_BLOCK_SIZE (3*1024)
40 static struct proc_dir_entry *proc_scsi;
42 /* Protect sht->present and sht->proc_dir */
43 static DECLARE_MUTEX(global_host_template_sem);
45 static int proc_scsi_read(char *buffer, char **start, off_t offset,
46 int length, int *eof, void *data)
48 struct Scsi_Host *shost = data;
51 n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
57 static int proc_scsi_write_proc(struct file *file, const char *buf,
58 unsigned long count, void *data)
60 struct Scsi_Host *shost = data;
61 ssize_t ret = -ENOMEM;
65 if (count > PROC_BLOCK_SIZE)
68 page = (char *)__get_free_page(GFP_KERNEL);
71 if (copy_from_user(page, buf, count))
73 ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
76 free_page((unsigned long)page);
80 void scsi_proc_hostdir_add(struct scsi_host_template *sht)
85 down(&global_host_template_sem);
86 if (!sht->present++) {
87 sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
89 printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
90 __FUNCTION__, sht->proc_name);
92 sht->proc_dir->owner = sht->module;
94 up(&global_host_template_sem);
97 void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
102 down(&global_host_template_sem);
103 if (!--sht->present && sht->proc_dir) {
104 remove_proc_entry(sht->proc_name, proc_scsi);
105 sht->proc_dir = NULL;
107 up(&global_host_template_sem);
110 void scsi_proc_host_add(struct Scsi_Host *shost)
112 struct scsi_host_template *sht = shost->hostt;
113 struct proc_dir_entry *p;
119 sprintf(name,"%d", shost->host_no);
120 p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
121 sht->proc_dir, proc_scsi_read, shost);
123 printk(KERN_ERR "%s: Failed to register host %d in"
124 "%s\n", __FUNCTION__, shost->host_no,
129 p->write_proc = proc_scsi_write_proc;
130 p->owner = sht->module;
133 void scsi_proc_host_rm(struct Scsi_Host *shost)
137 if (!shost->hostt->proc_dir)
140 sprintf(name,"%d", shost->host_no);
141 remove_proc_entry(name, shost->hostt->proc_dir);
144 static int proc_print_scsidevice(struct device *dev, void *data)
146 struct scsi_device *sdev = to_scsi_device(dev);
147 struct seq_file *s = data;
151 "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
152 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
153 for (i = 0; i < 8; i++) {
154 if (sdev->vendor[i] >= 0x20)
155 seq_printf(s, "%c", sdev->vendor[i]);
160 seq_printf(s, " Model: ");
161 for (i = 0; i < 16; i++) {
162 if (sdev->model[i] >= 0x20)
163 seq_printf(s, "%c", sdev->model[i]);
168 seq_printf(s, " Rev: ");
169 for (i = 0; i < 4; i++) {
170 if (sdev->rev[i] >= 0x20)
171 seq_printf(s, "%c", sdev->rev[i]);
178 seq_printf(s, " Type: %s ",
179 sdev->type < MAX_SCSI_DEVICE_CODE ?
180 scsi_device_types[(int) sdev->type] : "Unknown ");
181 seq_printf(s, " ANSI"
182 " SCSI revision: %02x", (sdev->scsi_level - 1) ?
183 sdev->scsi_level - 1 : 1);
184 if (sdev->scsi_level == 2)
185 seq_printf(s, " CCS\n");
192 static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
194 struct Scsi_Host *shost;
197 shost = scsi_host_lookup(host);
199 return PTR_ERR(shost);
201 error = scsi_scan_host_selected(shost, channel, id, lun, 1);
202 scsi_host_put(shost);
206 static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
208 struct scsi_device *sdev;
209 struct Scsi_Host *shost;
212 shost = scsi_host_lookup(host);
214 return PTR_ERR(shost);
215 sdev = scsi_device_lookup(shost, channel, id, lun);
217 scsi_remove_device(sdev);
218 scsi_device_put(sdev);
222 scsi_host_put(shost);
226 static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
227 size_t length, loff_t *ppos)
229 int host, channel, id, lun;
233 if (!buf || length > PAGE_SIZE)
236 buffer = (char *)__get_free_page(GFP_KERNEL);
241 if (copy_from_user(buffer, buf, length))
245 if (length < PAGE_SIZE)
246 buffer[length] = '\0';
247 else if (buffer[PAGE_SIZE-1])
251 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
252 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
254 if (!strncmp("scsi add-single-device", buffer, 22)) {
257 host = simple_strtoul(p, &p, 0);
258 channel = simple_strtoul(p + 1, &p, 0);
259 id = simple_strtoul(p + 1, &p, 0);
260 lun = simple_strtoul(p + 1, &p, 0);
262 err = scsi_add_single_device(host, channel, id, lun);
267 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
268 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
270 } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
273 host = simple_strtoul(p, &p, 0);
274 channel = simple_strtoul(p + 1, &p, 0);
275 id = simple_strtoul(p + 1, &p, 0);
276 lun = simple_strtoul(p + 1, &p, 0);
278 err = scsi_remove_single_device(host, channel, id, lun);
282 free_page((unsigned long)buffer);
286 static int proc_scsi_show(struct seq_file *s, void *p)
288 seq_printf(s, "Attached devices:\n");
289 bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
293 static int proc_scsi_open(struct inode *inode, struct file *file)
296 * We don't really needs this for the write case but it doesn't
299 return single_open(file, proc_scsi_show, NULL);
302 static struct file_operations proc_scsi_operations = {
303 .open = proc_scsi_open,
305 .write = proc_scsi_write,
307 .release = single_release,
310 int __init scsi_init_procfs(void)
312 struct proc_dir_entry *pde;
314 proc_scsi = proc_mkdir("scsi", 0);
318 pde = create_proc_entry("scsi/scsi", 0, NULL);
321 pde->proc_fops = &proc_scsi_operations;
326 remove_proc_entry("scsi", 0);
331 void scsi_exit_procfs(void)
333 remove_proc_entry("scsi/scsi", 0);
334 remove_proc_entry("scsi", 0);