Commit | Line | Data |
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1da177e4 LT |
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 | } |