Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / infiniband / hw / ipath / ipath_fs.c
1 /*
2  * Copyright (c) 2006 QLogic, Inc. 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/version.h>
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/mount.h>
38 #include <linux/pagemap.h>
39 #include <linux/init.h>
40 #include <linux/namei.h>
41
42 #include "ipath_kernel.h"
43
44 #define IPATHFS_MAGIC 0x726a77
45
46 static struct super_block *ipath_super;
47
48 static 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_mode = mode;
61         inode->i_uid = 0;
62         inode->i_gid = 0;
63         inode->i_blocks = 0;
64         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
65         inode->i_private = data;
66         if ((mode & S_IFMT) == S_IFDIR) {
67                 inode->i_op = &simple_dir_inode_operations;
68                 inc_nlink(inode);
69                 inc_nlink(dir);
70         }
71
72         inode->i_fop = fops;
73
74         d_instantiate(dentry, inode);
75         error = 0;
76
77 bail:
78         return error;
79 }
80
81 static int create_file(const char *name, mode_t mode,
82                        struct dentry *parent, struct dentry **dentry,
83                        const struct file_operations *fops, void *data)
84 {
85         int error;
86
87         *dentry = NULL;
88         mutex_lock(&parent->d_inode->i_mutex);
89         *dentry = lookup_one_len(name, parent, strlen(name));
90         if (!IS_ERR(dentry))
91                 error = ipathfs_mknod(parent->d_inode, *dentry,
92                                       mode, fops, data);
93         else
94                 error = PTR_ERR(dentry);
95         mutex_unlock(&parent->d_inode->i_mutex);
96
97         return error;
98 }
99
100 static ssize_t atomic_stats_read(struct file *file, char __user *buf,
101                                  size_t count, loff_t *ppos)
102 {
103         return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
104                                        sizeof ipath_stats);
105 }
106
107 static const struct file_operations atomic_stats_ops = {
108         .read = atomic_stats_read,
109 };
110
111 #define NUM_COUNTERS sizeof(struct infinipath_counters) / sizeof(u64)
112
113 static ssize_t atomic_counters_read(struct file *file, char __user *buf,
114                                     size_t count, loff_t *ppos)
115 {
116         u64 counters[NUM_COUNTERS];
117         u16 i;
118         struct ipath_devdata *dd;
119
120         dd = file->f_path.dentry->d_inode->i_private;
121
122         for (i = 0; i < NUM_COUNTERS; i++)
123                 counters[i] = ipath_snap_cntr(dd, i);
124
125         return simple_read_from_buffer(buf, count, ppos, counters,
126                                        sizeof counters);
127 }
128
129 static const struct file_operations atomic_counters_ops = {
130         .read = atomic_counters_read,
131 };
132
133 static ssize_t atomic_node_info_read(struct file *file, char __user *buf,
134                                      size_t count, loff_t *ppos)
135 {
136         u32 nodeinfo[10];
137         struct ipath_devdata *dd;
138         u64 guid;
139
140         dd = file->f_path.dentry->d_inode->i_private;
141
142         guid = be64_to_cpu(dd->ipath_guid);
143
144         nodeinfo[0] =                   /* BaseVersion is SMA */
145                 /* ClassVersion is SMA */
146                 (1 << 8)                /* NodeType  */
147                 | (1 << 0);             /* NumPorts */
148         nodeinfo[1] = (u32) (guid >> 32);
149         nodeinfo[2] = (u32) (guid & 0xffffffff);
150         /* PortGUID == SystemImageGUID for us */
151         nodeinfo[3] = nodeinfo[1];
152         /* PortGUID == SystemImageGUID for us */
153         nodeinfo[4] = nodeinfo[2];
154         /* PortGUID == NodeGUID for us */
155         nodeinfo[5] = nodeinfo[3];
156         /* PortGUID == NodeGUID for us */
157         nodeinfo[6] = nodeinfo[4];
158         nodeinfo[7] = (4 << 16) /* we support 4 pkeys */
159                 | (dd->ipath_deviceid << 0);
160         /* our chip version as 16 bits major, 16 bits minor */
161         nodeinfo[8] = dd->ipath_minrev | (dd->ipath_majrev << 16);
162         nodeinfo[9] = (dd->ipath_unit << 24) | (dd->ipath_vendorid << 0);
163
164         return simple_read_from_buffer(buf, count, ppos, nodeinfo,
165                                        sizeof nodeinfo);
166 }
167
168 static const struct file_operations atomic_node_info_ops = {
169         .read = atomic_node_info_read,
170 };
171
172 static ssize_t atomic_port_info_read(struct file *file, char __user *buf,
173                                      size_t count, loff_t *ppos)
174 {
175         u32 portinfo[13];
176         u32 tmp, tmp2;
177         struct ipath_devdata *dd;
178
179         dd = file->f_path.dentry->d_inode->i_private;
180
181         /* so we only initialize non-zero fields. */
182         memset(portinfo, 0, sizeof portinfo);
183
184         /*
185          * Notimpl yet M_Key (64)
186          * Notimpl yet GID (64)
187          */
188
189         portinfo[4] = (dd->ipath_lid << 16);
190
191         /*
192          * Notimpl yet SMLID.
193          * CapabilityMask is 0, we don't support any of these
194          * DiagCode is 0; we don't store any diag info for now Notimpl yet
195          * M_KeyLeasePeriod (we don't support M_Key)
196          */
197
198         /* LocalPortNum is whichever port number they ask for */
199         portinfo[7] = (dd->ipath_unit << 24)
200                 /* LinkWidthEnabled */
201                 | (2 << 16)
202                 /* LinkWidthSupported (really 2, but not IB valid) */
203                 | (3 << 8)
204                 /* LinkWidthActive */
205                 | (2 << 0);
206         tmp = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
207         tmp2 = 5;
208         if (tmp == IPATH_IBSTATE_INIT)
209                 tmp = 2;
210         else if (tmp == IPATH_IBSTATE_ARM)
211                 tmp = 3;
212         else if (tmp == IPATH_IBSTATE_ACTIVE)
213                 tmp = 4;
214         else {
215                 tmp = 0;        /* down */
216                 tmp2 = tmp & 0xf;
217         }
218
219         portinfo[8] = (1 << 28) /* LinkSpeedSupported */
220                 | (tmp << 24)   /* PortState */
221                 | (tmp2 << 20)  /* PortPhysicalState */
222                 | (2 << 16)
223
224                 /* LinkDownDefaultState */
225                 /* M_KeyProtectBits == 0 */
226                 /* NotImpl yet LMC == 0 (we can support all values) */
227                 | (1 << 4)      /* LinkSpeedActive */
228                 | (1 << 0);     /* LinkSpeedEnabled */
229         switch (dd->ipath_ibmtu) {
230         case 4096:
231                 tmp = 5;
232                 break;
233         case 2048:
234                 tmp = 4;
235                 break;
236         case 1024:
237                 tmp = 3;
238                 break;
239         case 512:
240                 tmp = 2;
241                 break;
242         case 256:
243                 tmp = 1;
244                 break;
245         default:                /* oops, something is wrong */
246                 ipath_dbg("Problem, ipath_ibmtu 0x%x not a valid IB MTU, "
247                           "treat as 2048\n", dd->ipath_ibmtu);
248                 tmp = 4;
249                 break;
250         }
251         portinfo[9] = (tmp << 28)
252                 /* NeighborMTU */
253                 /* Notimpl MasterSMSL */
254                 | (1 << 20)
255
256                 /* VLCap */
257                 /* Notimpl InitType (actually, an SMA decision) */
258                 /* VLHighLimit is 0 (only one VL) */
259                 ; /* VLArbitrationHighCap is 0 (only one VL) */
260         portinfo[10] =  /* VLArbitrationLowCap is 0 (only one VL) */
261                 /* InitTypeReply is SMA decision */
262                 (5 << 16)       /* MTUCap 4096 */
263                 | (7 << 13)     /* VLStallCount */
264                 | (0x1f << 8)   /* HOQLife */
265                 | (1 << 4)
266
267                 /* OperationalVLs 0 */
268                 /* PartitionEnforcementInbound */
269                 /* PartitionEnforcementOutbound not enforced */
270                 /* FilterRawinbound not enforced */
271                 ;               /* FilterRawOutbound not enforced */
272         /* M_KeyViolations are not counted by hardware, SMA can count */
273         tmp = ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
274         /* P_KeyViolations are counted by hardware. */
275         portinfo[11] = ((tmp & 0xffff) << 0);
276         portinfo[12] =
277                 /* Q_KeyViolations are not counted by hardware */
278                 (1 << 8)
279
280                 /* GUIDCap */
281                 /* SubnetTimeOut handled by SMA */
282                 /* RespTimeValue handled by SMA */
283                 ;
284         /* LocalPhyErrors are programmed to max */
285         portinfo[12] |= (0xf << 20)
286                 | (0xf << 16)   /* OverRunErrors are programmed to max */
287                 ;
288
289         return simple_read_from_buffer(buf, count, ppos, portinfo,
290                                        sizeof portinfo);
291 }
292
293 static const struct file_operations atomic_port_info_ops = {
294         .read = atomic_port_info_read,
295 };
296
297 static ssize_t flash_read(struct file *file, char __user *buf,
298                           size_t count, loff_t *ppos)
299 {
300         struct ipath_devdata *dd;
301         ssize_t ret;
302         loff_t pos;
303         char *tmp;
304
305         pos = *ppos;
306
307         if ( pos < 0) {
308                 ret = -EINVAL;
309                 goto bail;
310         }
311
312         if (pos >= sizeof(struct ipath_flash)) {
313                 ret = 0;
314                 goto bail;
315         }
316
317         if (count > sizeof(struct ipath_flash) - pos)
318                 count = sizeof(struct ipath_flash) - pos;
319
320         tmp = kmalloc(count, GFP_KERNEL);
321         if (!tmp) {
322                 ret = -ENOMEM;
323                 goto bail;
324         }
325
326         dd = file->f_path.dentry->d_inode->i_private;
327         if (ipath_eeprom_read(dd, pos, tmp, count)) {
328                 ipath_dev_err(dd, "failed to read from flash\n");
329                 ret = -ENXIO;
330                 goto bail_tmp;
331         }
332
333         if (copy_to_user(buf, tmp, count)) {
334                 ret = -EFAULT;
335                 goto bail_tmp;
336         }
337
338         *ppos = pos + count;
339         ret = count;
340
341 bail_tmp:
342         kfree(tmp);
343
344 bail:
345         return ret;
346 }
347
348 static ssize_t flash_write(struct file *file, const char __user *buf,
349                            size_t count, loff_t *ppos)
350 {
351         struct ipath_devdata *dd;
352         ssize_t ret;
353         loff_t pos;
354         char *tmp;
355
356         pos = *ppos;
357
358         if (pos != 0) {
359                 ret = -EINVAL;
360                 goto bail;
361         }
362
363         if (count != sizeof(struct ipath_flash)) {
364                 ret = -EINVAL;
365                 goto bail;
366         }
367
368         tmp = kmalloc(count, GFP_KERNEL);
369         if (!tmp) {
370                 ret = -ENOMEM;
371                 goto bail;
372         }
373
374         if (copy_from_user(tmp, buf, count)) {
375                 ret = -EFAULT;
376                 goto bail_tmp;
377         }
378
379         dd = file->f_path.dentry->d_inode->i_private;
380         if (ipath_eeprom_write(dd, pos, tmp, count)) {
381                 ret = -ENXIO;
382                 ipath_dev_err(dd, "failed to write to flash\n");
383                 goto bail_tmp;
384         }
385
386         *ppos = pos + count;
387         ret = count;
388
389 bail_tmp:
390         kfree(tmp);
391
392 bail:
393         return ret;
394 }
395
396 static const struct file_operations flash_ops = {
397         .read = flash_read,
398         .write = flash_write,
399 };
400
401 static int create_device_files(struct super_block *sb,
402                                struct ipath_devdata *dd)
403 {
404         struct dentry *dir, *tmp;
405         char unit[10];
406         int ret;
407
408         snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
409         ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
410                           (struct file_operations *) &simple_dir_operations,
411                           dd);
412         if (ret) {
413                 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
414                 goto bail;
415         }
416
417         ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
418                           &atomic_counters_ops, dd);
419         if (ret) {
420                 printk(KERN_ERR "create_file(%s/atomic_counters) "
421                        "failed: %d\n", unit, ret);
422                 goto bail;
423         }
424
425         ret = create_file("node_info", S_IFREG|S_IRUGO, dir, &tmp,
426                           &atomic_node_info_ops, dd);
427         if (ret) {
428                 printk(KERN_ERR "create_file(%s/node_info) "
429                        "failed: %d\n", unit, ret);
430                 goto bail;
431         }
432
433         ret = create_file("port_info", S_IFREG|S_IRUGO, dir, &tmp,
434                           &atomic_port_info_ops, dd);
435         if (ret) {
436                 printk(KERN_ERR "create_file(%s/port_info) "
437                        "failed: %d\n", unit, ret);
438                 goto bail;
439         }
440
441         ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
442                           &flash_ops, dd);
443         if (ret) {
444                 printk(KERN_ERR "create_file(%s/flash) "
445                        "failed: %d\n", unit, ret);
446                 goto bail;
447         }
448
449 bail:
450         return ret;
451 }
452
453 static int remove_file(struct dentry *parent, char *name)
454 {
455         struct dentry *tmp;
456         int ret;
457
458         tmp = lookup_one_len(name, parent, strlen(name));
459
460         if (IS_ERR(tmp)) {
461                 ret = PTR_ERR(tmp);
462                 goto bail;
463         }
464
465         spin_lock(&dcache_lock);
466         spin_lock(&tmp->d_lock);
467         if (!(d_unhashed(tmp) && tmp->d_inode)) {
468                 dget_locked(tmp);
469                 __d_drop(tmp);
470                 spin_unlock(&tmp->d_lock);
471                 spin_unlock(&dcache_lock);
472                 simple_unlink(parent->d_inode, tmp);
473         } else {
474                 spin_unlock(&tmp->d_lock);
475                 spin_unlock(&dcache_lock);
476         }
477
478         ret = 0;
479 bail:
480         /*
481          * We don't expect clients to care about the return value, but
482          * it's there if they need it.
483          */
484         return ret;
485 }
486
487 static int remove_device_files(struct super_block *sb,
488                                struct ipath_devdata *dd)
489 {
490         struct dentry *dir, *root;
491         char unit[10];
492         int ret;
493
494         root = dget(sb->s_root);
495         mutex_lock(&root->d_inode->i_mutex);
496         snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
497         dir = lookup_one_len(unit, root, strlen(unit));
498
499         if (IS_ERR(dir)) {
500                 ret = PTR_ERR(dir);
501                 printk(KERN_ERR "Lookup of %s failed\n", unit);
502                 goto bail;
503         }
504
505         remove_file(dir, "flash");
506         remove_file(dir, "port_info");
507         remove_file(dir, "node_info");
508         remove_file(dir, "atomic_counters");
509         d_delete(dir);
510         ret = simple_rmdir(root->d_inode, dir);
511
512 bail:
513         mutex_unlock(&root->d_inode->i_mutex);
514         dput(root);
515         return ret;
516 }
517
518 static int ipathfs_fill_super(struct super_block *sb, void *data,
519                               int silent)
520 {
521         struct ipath_devdata *dd, *tmp;
522         unsigned long flags;
523         int ret;
524
525         static struct tree_descr files[] = {
526                 [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
527                 {""},
528         };
529
530         ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
531         if (ret) {
532                 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
533                 goto bail;
534         }
535
536         spin_lock_irqsave(&ipath_devs_lock, flags);
537
538         list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
539                 spin_unlock_irqrestore(&ipath_devs_lock, flags);
540                 ret = create_device_files(sb, dd);
541                 if (ret) {
542                         deactivate_super(sb);
543                         goto bail;
544                 }
545                 spin_lock_irqsave(&ipath_devs_lock, flags);
546         }
547
548         spin_unlock_irqrestore(&ipath_devs_lock, flags);
549
550 bail:
551         return ret;
552 }
553
554 static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
555                         const char *dev_name, void *data, struct vfsmount *mnt)
556 {
557         int ret = get_sb_single(fs_type, flags, data,
558                                     ipathfs_fill_super, mnt);
559         if (ret >= 0)
560                 ipath_super = mnt->mnt_sb;
561         return ret;
562 }
563
564 static void ipathfs_kill_super(struct super_block *s)
565 {
566         kill_litter_super(s);
567         ipath_super = NULL;
568 }
569
570 int ipathfs_add_device(struct ipath_devdata *dd)
571 {
572         int ret;
573
574         if (ipath_super == NULL) {
575                 ret = 0;
576                 goto bail;
577         }
578
579         ret = create_device_files(ipath_super, dd);
580
581 bail:
582         return ret;
583 }
584
585 int ipathfs_remove_device(struct ipath_devdata *dd)
586 {
587         int ret;
588
589         if (ipath_super == NULL) {
590                 ret = 0;
591                 goto bail;
592         }
593
594         ret = remove_device_files(ipath_super, dd);
595
596 bail:
597         return ret;
598 }
599
600 static struct file_system_type ipathfs_fs_type = {
601         .owner =        THIS_MODULE,
602         .name =         "ipathfs",
603         .get_sb =       ipathfs_get_sb,
604         .kill_sb =      ipathfs_kill_super,
605 };
606
607 int __init ipath_init_ipathfs(void)
608 {
609         return register_filesystem(&ipathfs_fs_type);
610 }
611
612 void __exit ipath_exit_ipathfs(void)
613 {
614         unregister_filesystem(&ipathfs_fs_type);
615 }