[CPUFREQ] Fix the p4-clockmod N60 errata workaround.
[linux-2.6/mini2440.git] / drivers / scsi / scsi_proc.c
blob07be62bbaaeac049a37cfa82aefad75d877de14d
1 /*
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>
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 <linux/mutex.h>
29 #include <asm/uaccess.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_transport.h>
36 #include "scsi_priv.h"
37 #include "scsi_logging.h"
40 /* 4K page size, but our output routines, use some slack for overruns */
41 #define PROC_BLOCK_SIZE (3*1024)
43 static struct proc_dir_entry *proc_scsi;
45 /* Protect sht->present and sht->proc_dir */
46 static DEFINE_MUTEX(global_host_template_mutex);
48 static int proc_scsi_read(char *buffer, char **start, off_t offset,
49 int length, int *eof, void *data)
51 struct Scsi_Host *shost = data;
52 int n;
54 n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
55 *eof = (n < length);
57 return n;
60 static int proc_scsi_write_proc(struct file *file, const char __user *buf,
61 unsigned long count, void *data)
63 struct Scsi_Host *shost = data;
64 ssize_t ret = -ENOMEM;
65 char *page;
66 char *start;
68 if (count > PROC_BLOCK_SIZE)
69 return -EOVERFLOW;
71 page = (char *)__get_free_page(GFP_KERNEL);
72 if (page) {
73 ret = -EFAULT;
74 if (copy_from_user(page, buf, count))
75 goto out;
76 ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
78 out:
79 free_page((unsigned long)page);
80 return ret;
83 void scsi_proc_hostdir_add(struct scsi_host_template *sht)
85 if (!sht->proc_info)
86 return;
88 mutex_lock(&global_host_template_mutex);
89 if (!sht->present++) {
90 sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
91 if (!sht->proc_dir)
92 printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
93 __FUNCTION__, sht->proc_name);
94 else
95 sht->proc_dir->owner = sht->module;
97 mutex_unlock(&global_host_template_mutex);
100 void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
102 if (!sht->proc_info)
103 return;
105 mutex_lock(&global_host_template_mutex);
106 if (!--sht->present && sht->proc_dir) {
107 remove_proc_entry(sht->proc_name, proc_scsi);
108 sht->proc_dir = NULL;
110 mutex_unlock(&global_host_template_mutex);
113 void scsi_proc_host_add(struct Scsi_Host *shost)
115 struct scsi_host_template *sht = shost->hostt;
116 struct proc_dir_entry *p;
117 char name[10];
119 if (!sht->proc_dir)
120 return;
122 sprintf(name,"%d", shost->host_no);
123 p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
124 sht->proc_dir, proc_scsi_read, shost);
125 if (!p) {
126 printk(KERN_ERR "%s: Failed to register host %d in"
127 "%s\n", __FUNCTION__, shost->host_no,
128 sht->proc_name);
129 return;
132 p->write_proc = proc_scsi_write_proc;
133 p->owner = sht->module;
136 void scsi_proc_host_rm(struct Scsi_Host *shost)
138 char name[10];
140 if (!shost->hostt->proc_dir)
141 return;
143 sprintf(name,"%d", shost->host_no);
144 remove_proc_entry(name, shost->hostt->proc_dir);
147 static int proc_print_scsidevice(struct device *dev, void *data)
149 struct scsi_device *sdev = to_scsi_device(dev);
150 struct seq_file *s = data;
151 int i;
153 seq_printf(s,
154 "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
155 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
156 for (i = 0; i < 8; i++) {
157 if (sdev->vendor[i] >= 0x20)
158 seq_printf(s, "%c", sdev->vendor[i]);
159 else
160 seq_printf(s, " ");
163 seq_printf(s, " Model: ");
164 for (i = 0; i < 16; i++) {
165 if (sdev->model[i] >= 0x20)
166 seq_printf(s, "%c", sdev->model[i]);
167 else
168 seq_printf(s, " ");
171 seq_printf(s, " Rev: ");
172 for (i = 0; i < 4; i++) {
173 if (sdev->rev[i] >= 0x20)
174 seq_printf(s, "%c", sdev->rev[i]);
175 else
176 seq_printf(s, " ");
179 seq_printf(s, "\n");
181 seq_printf(s, " Type: %s ",
182 sdev->type < MAX_SCSI_DEVICE_CODE ?
183 scsi_device_types[(int) sdev->type] : "Unknown ");
184 seq_printf(s, " ANSI"
185 " SCSI revision: %02x", (sdev->scsi_level - 1) ?
186 sdev->scsi_level - 1 : 1);
187 if (sdev->scsi_level == 2)
188 seq_printf(s, " CCS\n");
189 else
190 seq_printf(s, "\n");
192 return 0;
195 static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
197 struct Scsi_Host *shost;
198 int error = -ENXIO;
200 shost = scsi_host_lookup(host);
201 if (IS_ERR(shost))
202 return PTR_ERR(shost);
204 if (shost->transportt->user_scan)
205 error = shost->transportt->user_scan(shost, channel, id, lun);
206 else
207 error = scsi_scan_host_selected(shost, channel, id, lun, 1);
208 scsi_host_put(shost);
209 return error;
212 static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
214 struct scsi_device *sdev;
215 struct Scsi_Host *shost;
216 int error = -ENXIO;
218 shost = scsi_host_lookup(host);
219 if (IS_ERR(shost))
220 return PTR_ERR(shost);
221 sdev = scsi_device_lookup(shost, channel, id, lun);
222 if (sdev) {
223 scsi_remove_device(sdev);
224 scsi_device_put(sdev);
225 error = 0;
228 scsi_host_put(shost);
229 return error;
232 static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
233 size_t length, loff_t *ppos)
235 int host, channel, id, lun;
236 char *buffer, *p;
237 int err;
239 if (!buf || length > PAGE_SIZE)
240 return -EINVAL;
242 buffer = (char *)__get_free_page(GFP_KERNEL);
243 if (!buffer)
244 return -ENOMEM;
246 err = -EFAULT;
247 if (copy_from_user(buffer, buf, length))
248 goto out;
250 err = -EINVAL;
251 if (length < PAGE_SIZE)
252 buffer[length] = '\0';
253 else if (buffer[PAGE_SIZE-1])
254 goto out;
257 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
258 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
260 if (!strncmp("scsi add-single-device", buffer, 22)) {
261 p = buffer + 23;
263 host = simple_strtoul(p, &p, 0);
264 channel = simple_strtoul(p + 1, &p, 0);
265 id = simple_strtoul(p + 1, &p, 0);
266 lun = simple_strtoul(p + 1, &p, 0);
268 err = scsi_add_single_device(host, channel, id, lun);
269 if (err >= 0)
270 err = length;
273 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
274 * with "0 1 2 3" replaced by your "Host Channel Id Lun".
276 } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
277 p = buffer + 26;
279 host = simple_strtoul(p, &p, 0);
280 channel = simple_strtoul(p + 1, &p, 0);
281 id = simple_strtoul(p + 1, &p, 0);
282 lun = simple_strtoul(p + 1, &p, 0);
284 err = scsi_remove_single_device(host, channel, id, lun);
287 out:
288 free_page((unsigned long)buffer);
289 return err;
292 static int proc_scsi_show(struct seq_file *s, void *p)
294 seq_printf(s, "Attached devices:\n");
295 bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
296 return 0;
299 static int proc_scsi_open(struct inode *inode, struct file *file)
302 * We don't really needs this for the write case but it doesn't
303 * harm either.
305 return single_open(file, proc_scsi_show, NULL);
308 static struct file_operations proc_scsi_operations = {
309 .open = proc_scsi_open,
310 .read = seq_read,
311 .write = proc_scsi_write,
312 .llseek = seq_lseek,
313 .release = single_release,
316 int __init scsi_init_procfs(void)
318 struct proc_dir_entry *pde;
320 proc_scsi = proc_mkdir("scsi", NULL);
321 if (!proc_scsi)
322 goto err1;
324 pde = create_proc_entry("scsi/scsi", 0, NULL);
325 if (!pde)
326 goto err2;
327 pde->proc_fops = &proc_scsi_operations;
329 return 0;
331 err2:
332 remove_proc_entry("scsi", NULL);
333 err1:
334 return -ENOMEM;
337 void scsi_exit_procfs(void)
339 remove_proc_entry("scsi/scsi", NULL);
340 remove_proc_entry("scsi", NULL);