1 /*
2 * linux/drivers/scsi/scsi_proc.c
3 *
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.
8 *
9 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
10 * Version: 0.99.8 last change: 95/09/13
11 *
12 * generic command parser provided by:
13 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
14 *
15 * generic_proc_info() support of xxxx_info() by:
16 * Michael A. Griffith <grif@acm.org>
17 */
18
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/string.h>
22 #include <linux/mm.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>
29
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_host.h>
33
34 #include "scsi_priv.h"
35 #include "scsi_logging.h"
36
37
38 /* 4K page size, but our output routines, use some slack for overruns */
39 #define PROC_BLOCK_SIZE (3*1024)
40
41 static struct proc_dir_entry *proc_scsi;
42
43 /* Protect sht->present and sht->proc_dir */
44 static DECLARE_MUTEX(global_host_template_sem);
45
46 static int proc_scsi_read(char *buffer, char **start, off_t offset,
47 int length, int *eof, void *data)
48 {
49 struct Scsi_Host *shost = data;
50 int n;
51
52 n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
53 *eof = (n < length);
54
55 return n;
56 }
57
58 static int proc_scsi_write_proc(struct file *file, const char __user *buf,
59 unsigned long count, void *data)
60 {
61 struct Scsi_Host *shost = data;
62 ssize_t ret = -ENOMEM;
63 char *page;
64 char *start;
65
66 if (count > PROC_BLOCK_SIZE)
67 return -EOVERFLOW;
68
69 page = (char *)__get_free_page(GFP_KERNEL);
70 if (page) {
71 ret = -EFAULT;
72 if (copy_from_user(page, buf, count))
73 goto out;
74 ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
75 }
76 out:
77 free_page((unsigned long)page);
78 return ret;
79 }
80
81 void scsi_proc_hostdir_add(struct scsi_host_template *sht)
82 {
83 if (!sht->proc_info)
84 return;
85
86 down(&global_host_template_sem);
87 if (!sht->present++) {
88 sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
89 if (!sht->proc_dir)
90 printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
91 __FUNCTION__, sht->proc_name);
92 else
93 sht->proc_dir->owner = sht->module;
94 }
95 up(&global_host_template_sem);
96 }
97
98 void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
99 {
100 if (!sht->proc_info)
101 return;
102
103 down(&global_host_template_sem);
104 if (!--sht->present && sht->proc_dir) {
105 remove_proc_entry(sht->proc_name, proc_scsi);
106 sht->proc_dir = NULL;
107 }
108 up(&global_host_template_sem);
109 }
110
111 void scsi_proc_host_add(struct Scsi_Host *shost)
112 {
113 struct scsi_host_template *sht = shost->hostt;
114 struct proc_dir_entry *p;
115 char name[10];
116
117 if (!sht->proc_dir)
118 return;
119
120 sprintf(name,"%d", shost->host_no);
121 p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
122 sht->proc_dir, proc_scsi_read, shost);
123 if (!p) {
124 printk(KERN_ERR "%s: Failed to register host %d in"
125 "%s\n", __FUNCTION__, shost->host_no,
126 sht->proc_name);
127 return;
128 }
129
130 p->write_proc = proc_scsi_write_proc;
131 p->owner = sht->module;
132 }
133
134 void scsi_proc_host_rm(struct Scsi_Host *shost)
135 {
136 char name[10];
137
138 if (!shost->hostt->proc_dir)
139 return;
140
141 sprintf(name,"%d", shost->host_no);
142 remove_proc_entry(name, shost->hostt->proc_dir);
143 }
144
145 static int proc_print_scsidevice(struct device *dev, void *data)
146 {
147 struct scsi_device *sdev = to_scsi_device(dev);
148 struct seq_file *s = data;
149 int i;
150
151 seq_printf(s,
152 "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
153 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
154 for (i = 0; i < 8; i++) {
155 if (sdev->vendor[i] >= 0x20)
156 seq_printf(s, "%c", sdev->vendor[i]);
157 else
158 seq_printf(s, " ");
159 }
160
161 seq_printf(s, " Model: ");
162 for (i = 0; i < 16; i++) {
163 if (sdev->model[i] >= 0x20)
164 seq_printf(s, "%c", sdev->model[i]);
165 else
166 seq_printf(s, " ");
167 }
168
169 seq_printf(s, " Rev: ");
170 for (i = 0; i < 4; i++) {
171 if (sdev->rev[i] >= 0x20)
172 seq_printf(s, "%c", sdev->rev[i]);
173 else
174 seq_printf(s, " ");
175 }
176
177 seq_printf(s, "\n");
178
179 seq_printf(s, " Type: %s ",
180 sdev->type < MAX_SCSI_DEVICE_CODE ?
181 scsi_device_types[(int) sdev->type] : "Unknown ");
182 seq_printf(s, " ANSI"
183 " SCSI revision: %02x", (sdev->scsi_level - 1) ?
184 sdev->scsi_level - 1 : 1);
185 if (sdev->scsi_level == 2)
186 seq_printf(s, " CCS\n");
187 else
188 seq_printf(s, "\n");
189
190 return 0;
191 }
192
193 static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
194 {
195 struct Scsi_Host *shost;
196 int error = -ENXIO;
197
198 shost = scsi_host_lookup(host);
199 if (IS_ERR(shost))
200 return PTR_ERR(shost);
201
202 error = scsi_scan_host_selected(shost, channel, id, lun, 1);
203 scsi_host_put(shost);
204 return error;
205 }
206
207 static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
208 {
209 struct scsi_device *sdev;
210 struct Scsi_Host *shost;
211 int error = -ENXIO;
212
213 shost = scsi_host_lookup(host);
214 if (IS_ERR(shost))
215 return PTR_ERR(shost);
216 sdev = scsi_device_lookup(shost, channel, id, lun);
217 if (sdev) {
218 scsi_remove_device(sdev);
219 scsi_device_put(sdev);
220 error = 0;
221 }
222
223 scsi_host_put(shost);
224 return error;
225 }
226
227 static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
228 size_t length, loff_t *ppos)
229 {
230 int host, channel, id, lun;
231 char *buffer, *p;
232 int err;
233
234 if (!buf || length > PAGE_SIZE)
235 return -EINVAL;
236
237 buffer = (char *)__get_free_page(GFP_KERNEL);
238 if (!buffer)
239 return -ENOMEM;
240
241 err = -EFAULT;
242 if (copy_from_user(buffer, buf, length))
243 goto out;
244
245 err = -EINVAL;
246 if (length < PAGE_SIZE)
247 buffer[length] = '\0';
248 else if (buffer[PAGE_SIZE-1])
249 goto out;
250
251 /*
252 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
253 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
254 */
255 if (!strncmp("scsi add-single-device", buffer, 22)) {
256 p = buffer + 23;
257
258 host = simple_strtoul(p, &p, 0);
259 channel = simple_strtoul(p + 1, &p, 0);
260 id = simple_strtoul(p + 1, &p, 0);
261 lun = simple_strtoul(p + 1, &p, 0);
262
263 err = scsi_add_single_device(host, channel, id, lun);
264 if (err >= 0)
265 err = length;
266
267 /*
268 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
269 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
270 */
271 } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
272 p = buffer + 26;
273
274 host = simple_strtoul(p, &p, 0);
275 channel = simple_strtoul(p + 1, &p, 0);
276 id = simple_strtoul(p + 1, &p, 0);
277 lun = simple_strtoul(p + 1, &p, 0);
278
279 err = scsi_remove_single_device(host, channel, id, lun);
280 }
281
282 out:
283 free_page((unsigned long)buffer);
284 return err;
285 }
286
287 static int proc_scsi_show(struct seq_file *s, void *p)
288 {
289 seq_printf(s, "Attached devices:\n");
290 bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
291 return 0;
292 }
293
294 static int proc_scsi_open(struct inode *inode, struct file *file)
295 {
296 /*
297 * We don't really needs this for the write case but it doesn't
298 * harm either.
299 */
300 return single_open(file, proc_scsi_show, NULL);
301 }
302
303 static struct file_operations proc_scsi_operations = {
304 .open = proc_scsi_open,
305 .read = seq_read,
306 .write = proc_scsi_write,
307 .llseek = seq_lseek,
308 .release = single_release,
309 };
310
311 int __init scsi_init_procfs(void)
312 {
313 struct proc_dir_entry *pde;
314
315 proc_scsi = proc_mkdir("scsi", NULL);
316 if (!proc_scsi)
317 goto err1;
318
319 pde = create_proc_entry("scsi/scsi", 0, NULL);
320 if (!pde)
321 goto err2;
322 pde->proc_fops = &proc_scsi_operations;
323
324 return 0;
325
326 err2:
327 remove_proc_entry("scsi", NULL);
328 err1:
329 return -ENOMEM;
330 }
331
332 void scsi_exit_procfs(void)
333 {
334 remove_proc_entry("scsi/scsi", NULL);
335 remove_proc_entry("scsi", NULL);
336 }
337
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