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1/*
2 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/module.h>
35#include <linux/fs.h>
36#include <linux/mount.h>
37#include <linux/pagemap.h>
38#include <linux/init.h>
39#include <linux/namei.h>
40#include <linux/slab.h>
41
42#include "ipath_kernel.h"
43
44#define IPATHFS_MAGIC 0x726a77
45
46static struct super_block *ipath_super;
47
48static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
49 int mode, const struct file_operations *fops,
50 void *data)
51{
52 int error;
53 struct inode *inode = new_inode(dir->i_sb);
54
55 if (!inode) {
56 error = -EPERM;
57 goto bail;
58 }
59
60 inode->i_ino = get_next_ino();
61 inode->i_mode = mode;
62 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
63 inode->i_private = data;
64 if ((mode & S_IFMT) == S_IFDIR) {
65 inode->i_op = &simple_dir_inode_operations;
66 inc_nlink(inode);
67 inc_nlink(dir);
68 }
69
70 inode->i_fop = fops;
71
72 d_instantiate(dentry, inode);
73 error = 0;
74
75bail:
76 return error;
77}
78
79static int create_file(const char *name, mode_t mode,
80 struct dentry *parent, struct dentry **dentry,
81 const struct file_operations *fops, void *data)
82{
83 int error;
84
85 *dentry = NULL;
86 mutex_lock(&parent->d_inode->i_mutex);
87 *dentry = lookup_one_len(name, parent, strlen(name));
88 if (!IS_ERR(*dentry))
89 error = ipathfs_mknod(parent->d_inode, *dentry,
90 mode, fops, data);
91 else
92 error = PTR_ERR(dentry);
93 mutex_unlock(&parent->d_inode->i_mutex);
94
95 return error;
96}
97
98static ssize_t atomic_stats_read(struct file *file, char __user *buf,
99 size_t count, loff_t *ppos)
100{
101 return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
102 sizeof ipath_stats);
103}
104
105static const struct file_operations atomic_stats_ops = {
106 .read = atomic_stats_read,
107 .llseek = default_llseek,
108};
109
110static ssize_t atomic_counters_read(struct file *file, char __user *buf,
111 size_t count, loff_t *ppos)
112{
113 struct infinipath_counters counters;
114 struct ipath_devdata *dd;
115
116 dd = file->f_path.dentry->d_inode->i_private;
117 dd->ipath_f_read_counters(dd, &counters);
118
119 return simple_read_from_buffer(buf, count, ppos, &counters,
120 sizeof counters);
121}
122
123static const struct file_operations atomic_counters_ops = {
124 .read = atomic_counters_read,
125 .llseek = default_llseek,
126};
127
128static ssize_t flash_read(struct file *file, char __user *buf,
129 size_t count, loff_t *ppos)
130{
131 struct ipath_devdata *dd;
132 ssize_t ret;
133 loff_t pos;
134 char *tmp;
135
136 pos = *ppos;
137
138 if ( pos < 0) {
139 ret = -EINVAL;
140 goto bail;
141 }
142
143 if (pos >= sizeof(struct ipath_flash)) {
144 ret = 0;
145 goto bail;
146 }
147
148 if (count > sizeof(struct ipath_flash) - pos)
149 count = sizeof(struct ipath_flash) - pos;
150
151 tmp = kmalloc(count, GFP_KERNEL);
152 if (!tmp) {
153 ret = -ENOMEM;
154 goto bail;
155 }
156
157 dd = file->f_path.dentry->d_inode->i_private;
158 if (ipath_eeprom_read(dd, pos, tmp, count)) {
159 ipath_dev_err(dd, "failed to read from flash\n");
160 ret = -ENXIO;
161 goto bail_tmp;
162 }
163
164 if (copy_to_user(buf, tmp, count)) {
165 ret = -EFAULT;
166 goto bail_tmp;
167 }
168
169 *ppos = pos + count;
170 ret = count;
171
172bail_tmp:
173 kfree(tmp);
174
175bail:
176 return ret;
177}
178
179static ssize_t flash_write(struct file *file, const char __user *buf,
180 size_t count, loff_t *ppos)
181{
182 struct ipath_devdata *dd;
183 ssize_t ret;
184 loff_t pos;
185 char *tmp;
186
187 pos = *ppos;
188
189 if (pos != 0) {
190 ret = -EINVAL;
191 goto bail;
192 }
193
194 if (count != sizeof(struct ipath_flash)) {
195 ret = -EINVAL;
196 goto bail;
197 }
198
199 tmp = kmalloc(count, GFP_KERNEL);
200 if (!tmp) {
201 ret = -ENOMEM;
202 goto bail;
203 }
204
205 if (copy_from_user(tmp, buf, count)) {
206 ret = -EFAULT;
207 goto bail_tmp;
208 }
209
210 dd = file->f_path.dentry->d_inode->i_private;
211 if (ipath_eeprom_write(dd, pos, tmp, count)) {
212 ret = -ENXIO;
213 ipath_dev_err(dd, "failed to write to flash\n");
214 goto bail_tmp;
215 }
216
217 *ppos = pos + count;
218 ret = count;
219
220bail_tmp:
221 kfree(tmp);
222
223bail:
224 return ret;
225}
226
227static const struct file_operations flash_ops = {
228 .read = flash_read,
229 .write = flash_write,
230 .llseek = default_llseek,
231};
232
233static int create_device_files(struct super_block *sb,
234 struct ipath_devdata *dd)
235{
236 struct dentry *dir, *tmp;
237 char unit[10];
238 int ret;
239
240 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
241 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
242 &simple_dir_operations, dd);
243 if (ret) {
244 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
245 goto bail;
246 }
247
248 ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
249 &atomic_counters_ops, dd);
250 if (ret) {
251 printk(KERN_ERR "create_file(%s/atomic_counters) "
252 "failed: %d\n", unit, ret);
253 goto bail;
254 }
255
256 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
257 &flash_ops, dd);
258 if (ret) {
259 printk(KERN_ERR "create_file(%s/flash) "
260 "failed: %d\n", unit, ret);
261 goto bail;
262 }
263
264bail:
265 return ret;
266}
267
268static int remove_file(struct dentry *parent, char *name)
269{
270 struct dentry *tmp;
271 int ret;
272
273 tmp = lookup_one_len(name, parent, strlen(name));
274
275 if (IS_ERR(tmp)) {
276 ret = PTR_ERR(tmp);
277 goto bail;
278 }
279
280 spin_lock(&tmp->d_lock);
281 if (!(d_unhashed(tmp) && tmp->d_inode)) {
282 dget_dlock(tmp);
283 __d_drop(tmp);
284 spin_unlock(&tmp->d_lock);
285 simple_unlink(parent->d_inode, tmp);
286 } else
287 spin_unlock(&tmp->d_lock);
288
289 ret = 0;
290bail:
291 /*
292 * We don't expect clients to care about the return value, but
293 * it's there if they need it.
294 */
295 return ret;
296}
297
298static int remove_device_files(struct super_block *sb,
299 struct ipath_devdata *dd)
300{
301 struct dentry *dir, *root;
302 char unit[10];
303 int ret;
304
305 root = dget(sb->s_root);
306 mutex_lock(&root->d_inode->i_mutex);
307 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
308 dir = lookup_one_len(unit, root, strlen(unit));
309
310 if (IS_ERR(dir)) {
311 ret = PTR_ERR(dir);
312 printk(KERN_ERR "Lookup of %s failed\n", unit);
313 goto bail;
314 }
315
316 remove_file(dir, "flash");
317 remove_file(dir, "atomic_counters");
318 d_delete(dir);
319 ret = simple_rmdir(root->d_inode, dir);
320
321bail:
322 mutex_unlock(&root->d_inode->i_mutex);
323 dput(root);
324 return ret;
325}
326
327static int ipathfs_fill_super(struct super_block *sb, void *data,
328 int silent)
329{
330 struct ipath_devdata *dd, *tmp;
331 unsigned long flags;
332 int ret;
333
334 static struct tree_descr files[] = {
335 [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
336 {""},
337 };
338
339 ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
340 if (ret) {
341 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
342 goto bail;
343 }
344
345 spin_lock_irqsave(&ipath_devs_lock, flags);
346
347 list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
348 spin_unlock_irqrestore(&ipath_devs_lock, flags);
349 ret = create_device_files(sb, dd);
350 if (ret)
351 goto bail;
352 spin_lock_irqsave(&ipath_devs_lock, flags);
353 }
354
355 spin_unlock_irqrestore(&ipath_devs_lock, flags);
356
357bail:
358 return ret;
359}
360
361static struct dentry *ipathfs_mount(struct file_system_type *fs_type,
362 int flags, const char *dev_name, void *data)
363{
364 struct dentry *ret;
365 ret = mount_single(fs_type, flags, data, ipathfs_fill_super);
366 if (!IS_ERR(ret))
367 ipath_super = ret->d_sb;
368 return ret;
369}
370
371static void ipathfs_kill_super(struct super_block *s)
372{
373 kill_litter_super(s);
374 ipath_super = NULL;
375}
376
377int ipathfs_add_device(struct ipath_devdata *dd)
378{
379 int ret;
380
381 if (ipath_super == NULL) {
382 ret = 0;
383 goto bail;
384 }
385
386 ret = create_device_files(ipath_super, dd);
387
388bail:
389 return ret;
390}
391
392int ipathfs_remove_device(struct ipath_devdata *dd)
393{
394 int ret;
395
396 if (ipath_super == NULL) {
397 ret = 0;
398 goto bail;
399 }
400
401 ret = remove_device_files(ipath_super, dd);
402
403bail:
404 return ret;
405}
406
407static struct file_system_type ipathfs_fs_type = {
408 .owner = THIS_MODULE,
409 .name = "ipathfs",
410 .mount = ipathfs_mount,
411 .kill_sb = ipathfs_kill_super,
412};
413
414int __init ipath_init_ipathfs(void)
415{
416 return register_filesystem(&ipathfs_fs_type);
417}
418
419void __exit ipath_exit_ipathfs(void)
420{
421 unregister_filesystem(&ipathfs_fs_type);
422}