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11#include <linux/file.h>
12#include <linux/fs.h>
13#include <linux/fsnotify.h>
14#include <linux/backing-dev.h>
15#include <linux/init.h>
16#include <linux/ioctl.h>
17#include <linux/module.h>
18#include <linux/mount.h>
19#include <linux/namei.h>
20#include <linux/pagemap.h>
21#include <linux/poll.h>
22#include <linux/slab.h>
23#include <linux/parser.h>
24
25#include <asm/prom.h>
26#include <asm/spu.h>
27#include <asm/spu_priv1.h>
28#include <linux/uaccess.h>
29
30#include "spufs.h"
31
32struct spufs_sb_info {
33 int debug;
34};
35
36static struct kmem_cache *spufs_inode_cache;
37char *isolated_loader;
38static int isolated_loader_size;
39
40static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
41{
42 return sb->s_fs_info;
43}
44
45static struct inode *
46spufs_alloc_inode(struct super_block *sb)
47{
48 struct spufs_inode_info *ei;
49
50 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
51 if (!ei)
52 return NULL;
53
54 ei->i_gang = NULL;
55 ei->i_ctx = NULL;
56 ei->i_openers = 0;
57
58 return &ei->vfs_inode;
59}
60
61static void spufs_free_inode(struct inode *inode)
62{
63 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
64}
65
66static void
67spufs_init_once(void *p)
68{
69 struct spufs_inode_info *ei = p;
70
71 inode_init_once(&ei->vfs_inode);
72}
73
74static struct inode *
75spufs_new_inode(struct super_block *sb, umode_t mode)
76{
77 struct inode *inode;
78
79 inode = new_inode(sb);
80 if (!inode)
81 goto out;
82
83 inode->i_ino = get_next_ino();
84 inode->i_mode = mode;
85 inode->i_uid = current_fsuid();
86 inode->i_gid = current_fsgid();
87 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
88out:
89 return inode;
90}
91
92static int
93spufs_setattr(struct dentry *dentry, struct iattr *attr)
94{
95 struct inode *inode = d_inode(dentry);
96
97 if ((attr->ia_valid & ATTR_SIZE) &&
98 (attr->ia_size != inode->i_size))
99 return -EINVAL;
100 setattr_copy(inode, attr);
101 mark_inode_dirty(inode);
102 return 0;
103}
104
105
106static int
107spufs_new_file(struct super_block *sb, struct dentry *dentry,
108 const struct file_operations *fops, umode_t mode,
109 size_t size, struct spu_context *ctx)
110{
111 static const struct inode_operations spufs_file_iops = {
112 .setattr = spufs_setattr,
113 };
114 struct inode *inode;
115 int ret;
116
117 ret = -ENOSPC;
118 inode = spufs_new_inode(sb, S_IFREG | mode);
119 if (!inode)
120 goto out;
121
122 ret = 0;
123 inode->i_op = &spufs_file_iops;
124 inode->i_fop = fops;
125 inode->i_size = size;
126 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
127 d_add(dentry, inode);
128out:
129 return ret;
130}
131
132static void
133spufs_evict_inode(struct inode *inode)
134{
135 struct spufs_inode_info *ei = SPUFS_I(inode);
136 clear_inode(inode);
137 if (ei->i_ctx)
138 put_spu_context(ei->i_ctx);
139 if (ei->i_gang)
140 put_spu_gang(ei->i_gang);
141}
142
143static void spufs_prune_dir(struct dentry *dir)
144{
145 struct dentry *dentry, *tmp;
146
147 inode_lock(d_inode(dir));
148 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
149 spin_lock(&dentry->d_lock);
150 if (simple_positive(dentry)) {
151 dget_dlock(dentry);
152 __d_drop(dentry);
153 spin_unlock(&dentry->d_lock);
154 simple_unlink(d_inode(dir), dentry);
155
156
157
158 dput(dentry);
159 } else {
160 spin_unlock(&dentry->d_lock);
161 }
162 }
163 shrink_dcache_parent(dir);
164 inode_unlock(d_inode(dir));
165}
166
167
168static int spufs_rmdir(struct inode *parent, struct dentry *dir)
169{
170
171 int res;
172 spufs_prune_dir(dir);
173 d_drop(dir);
174 res = simple_rmdir(parent, dir);
175
176 spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
177 return res;
178}
179
180static int spufs_fill_dir(struct dentry *dir,
181 const struct spufs_tree_descr *files, umode_t mode,
182 struct spu_context *ctx)
183{
184 while (files->name && files->name[0]) {
185 int ret;
186 struct dentry *dentry = d_alloc_name(dir, files->name);
187 if (!dentry)
188 return -ENOMEM;
189 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
190 files->mode & mode, files->size, ctx);
191 if (ret)
192 return ret;
193 files++;
194 }
195 return 0;
196}
197
198static int spufs_dir_close(struct inode *inode, struct file *file)
199{
200 struct spu_context *ctx;
201 struct inode *parent;
202 struct dentry *dir;
203 int ret;
204
205 dir = file->f_path.dentry;
206 parent = d_inode(dir->d_parent);
207 ctx = SPUFS_I(d_inode(dir))->i_ctx;
208
209 inode_lock_nested(parent, I_MUTEX_PARENT);
210 ret = spufs_rmdir(parent, dir);
211 inode_unlock(parent);
212 WARN_ON(ret);
213
214 return dcache_dir_close(inode, file);
215}
216
217const struct file_operations spufs_context_fops = {
218 .open = dcache_dir_open,
219 .release = spufs_dir_close,
220 .llseek = dcache_dir_lseek,
221 .read = generic_read_dir,
222 .iterate_shared = dcache_readdir,
223 .fsync = noop_fsync,
224};
225EXPORT_SYMBOL_GPL(spufs_context_fops);
226
227static int
228spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
229 umode_t mode)
230{
231 int ret;
232 struct inode *inode;
233 struct spu_context *ctx;
234
235 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
236 if (!inode)
237 return -ENOSPC;
238
239 if (dir->i_mode & S_ISGID) {
240 inode->i_gid = dir->i_gid;
241 inode->i_mode &= S_ISGID;
242 }
243 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang);
244 SPUFS_I(inode)->i_ctx = ctx;
245 if (!ctx) {
246 iput(inode);
247 return -ENOSPC;
248 }
249
250 ctx->flags = flags;
251 inode->i_op = &simple_dir_inode_operations;
252 inode->i_fop = &simple_dir_operations;
253
254 inode_lock(inode);
255
256 dget(dentry);
257 inc_nlink(dir);
258 inc_nlink(inode);
259
260 d_instantiate(dentry, inode);
261
262 if (flags & SPU_CREATE_NOSCHED)
263 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
264 mode, ctx);
265 else
266 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
267
268 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
269 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
270 mode, ctx);
271
272 if (ret)
273 spufs_rmdir(dir, dentry);
274
275 inode_unlock(inode);
276
277 return ret;
278}
279
280static int spufs_context_open(struct path *path)
281{
282 int ret;
283 struct file *filp;
284
285 ret = get_unused_fd_flags(0);
286 if (ret < 0)
287 return ret;
288
289 filp = dentry_open(path, O_RDONLY, current_cred());
290 if (IS_ERR(filp)) {
291 put_unused_fd(ret);
292 return PTR_ERR(filp);
293 }
294
295 filp->f_op = &spufs_context_fops;
296 fd_install(ret, filp);
297 return ret;
298}
299
300static struct spu_context *
301spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
302 struct file *filp)
303{
304 struct spu_context *tmp, *neighbor, *err;
305 int count, node;
306 int aff_supp;
307
308 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
309 struct spu, cbe_list))->aff_list);
310
311 if (!aff_supp)
312 return ERR_PTR(-EINVAL);
313
314 if (flags & SPU_CREATE_GANG)
315 return ERR_PTR(-EINVAL);
316
317 if (flags & SPU_CREATE_AFFINITY_MEM &&
318 gang->aff_ref_ctx &&
319 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
320 return ERR_PTR(-EEXIST);
321
322 if (gang->aff_flags & AFF_MERGED)
323 return ERR_PTR(-EBUSY);
324
325 neighbor = NULL;
326 if (flags & SPU_CREATE_AFFINITY_SPU) {
327 if (!filp || filp->f_op != &spufs_context_fops)
328 return ERR_PTR(-EINVAL);
329
330 neighbor = get_spu_context(
331 SPUFS_I(file_inode(filp))->i_ctx);
332
333 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
334 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
335 !list_entry(neighbor->aff_list.next, struct spu_context,
336 aff_list)->aff_head) {
337 err = ERR_PTR(-EEXIST);
338 goto out_put_neighbor;
339 }
340
341 if (gang != neighbor->gang) {
342 err = ERR_PTR(-EINVAL);
343 goto out_put_neighbor;
344 }
345
346 count = 1;
347 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
348 count++;
349 if (list_empty(&neighbor->aff_list))
350 count++;
351
352 for (node = 0; node < MAX_NUMNODES; node++) {
353 if ((cbe_spu_info[node].n_spus - atomic_read(
354 &cbe_spu_info[node].reserved_spus)) >= count)
355 break;
356 }
357
358 if (node == MAX_NUMNODES) {
359 err = ERR_PTR(-EEXIST);
360 goto out_put_neighbor;
361 }
362 }
363
364 return neighbor;
365
366out_put_neighbor:
367 put_spu_context(neighbor);
368 return err;
369}
370
371static void
372spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
373 struct spu_context *neighbor)
374{
375 if (flags & SPU_CREATE_AFFINITY_MEM)
376 ctx->gang->aff_ref_ctx = ctx;
377
378 if (flags & SPU_CREATE_AFFINITY_SPU) {
379 if (list_empty(&neighbor->aff_list)) {
380 list_add_tail(&neighbor->aff_list,
381 &ctx->gang->aff_list_head);
382 neighbor->aff_head = 1;
383 }
384
385 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
386 || list_entry(neighbor->aff_list.next, struct spu_context,
387 aff_list)->aff_head) {
388 list_add(&ctx->aff_list, &neighbor->aff_list);
389 } else {
390 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
391 if (neighbor->aff_head) {
392 neighbor->aff_head = 0;
393 ctx->aff_head = 1;
394 }
395 }
396
397 if (!ctx->gang->aff_ref_ctx)
398 ctx->gang->aff_ref_ctx = ctx;
399 }
400}
401
402static int
403spufs_create_context(struct inode *inode, struct dentry *dentry,
404 struct vfsmount *mnt, int flags, umode_t mode,
405 struct file *aff_filp)
406{
407 int ret;
408 int affinity;
409 struct spu_gang *gang;
410 struct spu_context *neighbor;
411 struct path path = {.mnt = mnt, .dentry = dentry};
412
413 if ((flags & SPU_CREATE_NOSCHED) &&
414 !capable(CAP_SYS_NICE))
415 return -EPERM;
416
417 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
418 == SPU_CREATE_ISOLATE)
419 return -EINVAL;
420
421 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
422 return -ENODEV;
423
424 gang = NULL;
425 neighbor = NULL;
426 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
427 if (affinity) {
428 gang = SPUFS_I(inode)->i_gang;
429 if (!gang)
430 return -EINVAL;
431 mutex_lock(&gang->aff_mutex);
432 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
433 if (IS_ERR(neighbor)) {
434 ret = PTR_ERR(neighbor);
435 goto out_aff_unlock;
436 }
437 }
438
439 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
440 if (ret)
441 goto out_aff_unlock;
442
443 if (affinity) {
444 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
445 neighbor);
446 if (neighbor)
447 put_spu_context(neighbor);
448 }
449
450 ret = spufs_context_open(&path);
451 if (ret < 0)
452 WARN_ON(spufs_rmdir(inode, dentry));
453
454out_aff_unlock:
455 if (affinity)
456 mutex_unlock(&gang->aff_mutex);
457 return ret;
458}
459
460static int
461spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
462{
463 int ret;
464 struct inode *inode;
465 struct spu_gang *gang;
466
467 ret = -ENOSPC;
468 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
469 if (!inode)
470 goto out;
471
472 ret = 0;
473 if (dir->i_mode & S_ISGID) {
474 inode->i_gid = dir->i_gid;
475 inode->i_mode &= S_ISGID;
476 }
477 gang = alloc_spu_gang();
478 SPUFS_I(inode)->i_ctx = NULL;
479 SPUFS_I(inode)->i_gang = gang;
480 if (!gang) {
481 ret = -ENOMEM;
482 goto out_iput;
483 }
484
485 inode->i_op = &simple_dir_inode_operations;
486 inode->i_fop = &simple_dir_operations;
487
488 d_instantiate(dentry, inode);
489 inc_nlink(dir);
490 inc_nlink(d_inode(dentry));
491 return ret;
492
493out_iput:
494 iput(inode);
495out:
496 return ret;
497}
498
499static int spufs_gang_open(struct path *path)
500{
501 int ret;
502 struct file *filp;
503
504 ret = get_unused_fd_flags(0);
505 if (ret < 0)
506 return ret;
507
508
509
510
511
512 filp = dentry_open(path, O_RDONLY, current_cred());
513 if (IS_ERR(filp)) {
514 put_unused_fd(ret);
515 return PTR_ERR(filp);
516 }
517
518 filp->f_op = &simple_dir_operations;
519 fd_install(ret, filp);
520 return ret;
521}
522
523static int spufs_create_gang(struct inode *inode,
524 struct dentry *dentry,
525 struct vfsmount *mnt, umode_t mode)
526{
527 struct path path = {.mnt = mnt, .dentry = dentry};
528 int ret;
529
530 ret = spufs_mkgang(inode, dentry, mode & 0777);
531 if (!ret) {
532 ret = spufs_gang_open(&path);
533 if (ret < 0) {
534 int err = simple_rmdir(inode, dentry);
535 WARN_ON(err);
536 }
537 }
538 return ret;
539}
540
541
542static struct file_system_type spufs_type;
543
544long spufs_create(struct path *path, struct dentry *dentry,
545 unsigned int flags, umode_t mode, struct file *filp)
546{
547 struct inode *dir = d_inode(path->dentry);
548 int ret;
549
550
551 if (path->dentry->d_sb->s_type != &spufs_type)
552 return -EINVAL;
553
554
555 if (flags & (~SPU_CREATE_FLAG_ALL))
556 return -EINVAL;
557
558
559 if (path->dentry != path->dentry->d_sb->s_root)
560 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
561 return -EINVAL;
562
563 mode &= ~current_umask();
564
565 if (flags & SPU_CREATE_GANG)
566 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
567 else
568 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
569 filp);
570 if (ret >= 0)
571 fsnotify_mkdir(dir, dentry);
572
573 return ret;
574}
575
576
577enum {
578 Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
579};
580
581static const match_table_t spufs_tokens = {
582 { Opt_uid, "uid=%d" },
583 { Opt_gid, "gid=%d" },
584 { Opt_mode, "mode=%o" },
585 { Opt_debug, "debug" },
586 { Opt_err, NULL },
587};
588
589static int spufs_show_options(struct seq_file *m, struct dentry *root)
590{
591 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
592 struct inode *inode = root->d_inode;
593
594 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
595 seq_printf(m, ",uid=%u",
596 from_kuid_munged(&init_user_ns, inode->i_uid));
597 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
598 seq_printf(m, ",gid=%u",
599 from_kgid_munged(&init_user_ns, inode->i_gid));
600 if ((inode->i_mode & S_IALLUGO) != 0775)
601 seq_printf(m, ",mode=%o", inode->i_mode);
602 if (sbi->debug)
603 seq_puts(m, ",debug");
604 return 0;
605}
606
607static int
608spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
609{
610 char *p;
611 substring_t args[MAX_OPT_ARGS];
612
613 while ((p = strsep(&options, ",")) != NULL) {
614 int token, option;
615
616 if (!*p)
617 continue;
618
619 token = match_token(p, spufs_tokens, args);
620 switch (token) {
621 case Opt_uid:
622 if (match_int(&args[0], &option))
623 return 0;
624 root->i_uid = make_kuid(current_user_ns(), option);
625 if (!uid_valid(root->i_uid))
626 return 0;
627 break;
628 case Opt_gid:
629 if (match_int(&args[0], &option))
630 return 0;
631 root->i_gid = make_kgid(current_user_ns(), option);
632 if (!gid_valid(root->i_gid))
633 return 0;
634 break;
635 case Opt_mode:
636 if (match_octal(&args[0], &option))
637 return 0;
638 root->i_mode = option | S_IFDIR;
639 break;
640 case Opt_debug:
641 spufs_get_sb_info(sb)->debug = 1;
642 break;
643 default:
644 return 0;
645 }
646 }
647 return 1;
648}
649
650static void spufs_exit_isolated_loader(void)
651{
652 free_pages((unsigned long) isolated_loader,
653 get_order(isolated_loader_size));
654}
655
656static void
657spufs_init_isolated_loader(void)
658{
659 struct device_node *dn;
660 const char *loader;
661 int size;
662
663 dn = of_find_node_by_path("/spu-isolation");
664 if (!dn)
665 return;
666
667 loader = of_get_property(dn, "loader", &size);
668 if (!loader)
669 return;
670
671
672 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
673 if (!isolated_loader)
674 return;
675
676 isolated_loader_size = size;
677 memcpy(isolated_loader, loader, size);
678 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
679}
680
681static int
682spufs_create_root(struct super_block *sb, void *data)
683{
684 struct inode *inode;
685 int ret;
686
687 ret = -ENODEV;
688 if (!spu_management_ops)
689 goto out;
690
691 ret = -ENOMEM;
692 inode = spufs_new_inode(sb, S_IFDIR | 0775);
693 if (!inode)
694 goto out;
695
696 inode->i_op = &simple_dir_inode_operations;
697 inode->i_fop = &simple_dir_operations;
698 SPUFS_I(inode)->i_ctx = NULL;
699 inc_nlink(inode);
700
701 ret = -EINVAL;
702 if (!spufs_parse_options(sb, data, inode))
703 goto out_iput;
704
705 ret = -ENOMEM;
706 sb->s_root = d_make_root(inode);
707 if (!sb->s_root)
708 goto out;
709
710 return 0;
711out_iput:
712 iput(inode);
713out:
714 return ret;
715}
716
717static int
718spufs_fill_super(struct super_block *sb, void *data, int silent)
719{
720 struct spufs_sb_info *info;
721 static const struct super_operations s_ops = {
722 .alloc_inode = spufs_alloc_inode,
723 .free_inode = spufs_free_inode,
724 .statfs = simple_statfs,
725 .evict_inode = spufs_evict_inode,
726 .show_options = spufs_show_options,
727 };
728
729 info = kzalloc(sizeof(*info), GFP_KERNEL);
730 if (!info)
731 return -ENOMEM;
732
733 sb->s_maxbytes = MAX_LFS_FILESIZE;
734 sb->s_blocksize = PAGE_SIZE;
735 sb->s_blocksize_bits = PAGE_SHIFT;
736 sb->s_magic = SPUFS_MAGIC;
737 sb->s_op = &s_ops;
738 sb->s_fs_info = info;
739
740 return spufs_create_root(sb, data);
741}
742
743static struct dentry *
744spufs_mount(struct file_system_type *fstype, int flags,
745 const char *name, void *data)
746{
747 return mount_single(fstype, flags, data, spufs_fill_super);
748}
749
750static struct file_system_type spufs_type = {
751 .owner = THIS_MODULE,
752 .name = "spufs",
753 .mount = spufs_mount,
754 .kill_sb = kill_litter_super,
755};
756MODULE_ALIAS_FS("spufs");
757
758static int __init spufs_init(void)
759{
760 int ret;
761
762 ret = -ENODEV;
763 if (!spu_management_ops)
764 goto out;
765
766 ret = -ENOMEM;
767 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
768 sizeof(struct spufs_inode_info), 0,
769 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
770
771 if (!spufs_inode_cache)
772 goto out;
773 ret = spu_sched_init();
774 if (ret)
775 goto out_cache;
776 ret = register_spu_syscalls(&spufs_calls);
777 if (ret)
778 goto out_sched;
779 ret = register_filesystem(&spufs_type);
780 if (ret)
781 goto out_syscalls;
782
783 spufs_init_isolated_loader();
784
785 return 0;
786
787out_syscalls:
788 unregister_spu_syscalls(&spufs_calls);
789out_sched:
790 spu_sched_exit();
791out_cache:
792 kmem_cache_destroy(spufs_inode_cache);
793out:
794 return ret;
795}
796module_init(spufs_init);
797
798static void __exit spufs_exit(void)
799{
800 spu_sched_exit();
801 spufs_exit_isolated_loader();
802 unregister_spu_syscalls(&spufs_calls);
803 unregister_filesystem(&spufs_type);
804 kmem_cache_destroy(spufs_inode_cache);
805}
806module_exit(spufs_exit);
807
808MODULE_LICENSE("GPL");
809MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
810
811
