1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | |
3 | /* |
4 | * SPU file system |
5 | * |
6 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
7 | * |
8 | * Author: Arnd Bergmann <arndb@de.ibm.com> |
9 | */ |
10 | |
11 | #include <linux/file.h> |
12 | #include <linux/fs.h> |
13 | #include <linux/fs_context.h> |
14 | #include <linux/fs_parser.h> |
15 | #include <linux/fsnotify.h> |
16 | #include <linux/backing-dev.h> |
17 | #include <linux/init.h> |
18 | #include <linux/ioctl.h> |
19 | #include <linux/module.h> |
20 | #include <linux/mount.h> |
21 | #include <linux/namei.h> |
22 | #include <linux/pagemap.h> |
23 | #include <linux/poll.h> |
24 | #include <linux/of.h> |
25 | #include <linux/seq_file.h> |
26 | #include <linux/slab.h> |
27 | |
28 | #include <asm/spu.h> |
29 | #include <asm/spu_priv1.h> |
30 | #include <linux/uaccess.h> |
31 | |
32 | #include "spufs.h" |
33 | |
34 | struct spufs_sb_info { |
35 | bool debug; |
36 | }; |
37 | |
38 | static struct kmem_cache *spufs_inode_cache; |
39 | char *isolated_loader; |
40 | static int isolated_loader_size; |
41 | |
42 | static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb) |
43 | { |
44 | return sb->s_fs_info; |
45 | } |
46 | |
47 | static struct inode * |
48 | spufs_alloc_inode(struct super_block *sb) |
49 | { |
50 | struct spufs_inode_info *ei; |
51 | |
52 | ei = kmem_cache_alloc(cachep: spufs_inode_cache, GFP_KERNEL); |
53 | if (!ei) |
54 | return NULL; |
55 | |
56 | ei->i_gang = NULL; |
57 | ei->i_ctx = NULL; |
58 | ei->i_openers = 0; |
59 | |
60 | return &ei->vfs_inode; |
61 | } |
62 | |
63 | static void spufs_free_inode(struct inode *inode) |
64 | { |
65 | kmem_cache_free(s: spufs_inode_cache, SPUFS_I(inode)); |
66 | } |
67 | |
68 | static void |
69 | spufs_init_once(void *p) |
70 | { |
71 | struct spufs_inode_info *ei = p; |
72 | |
73 | inode_init_once(&ei->vfs_inode); |
74 | } |
75 | |
76 | static struct inode * |
77 | spufs_new_inode(struct super_block *sb, umode_t mode) |
78 | { |
79 | struct inode *inode; |
80 | |
81 | inode = new_inode(sb); |
82 | if (!inode) |
83 | goto out; |
84 | |
85 | inode->i_ino = get_next_ino(); |
86 | inode->i_mode = mode; |
87 | inode->i_uid = current_fsuid(); |
88 | inode->i_gid = current_fsgid(); |
89 | simple_inode_init_ts(inode); |
90 | out: |
91 | return inode; |
92 | } |
93 | |
94 | static int |
95 | spufs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, |
96 | struct iattr *attr) |
97 | { |
98 | struct inode *inode = d_inode(dentry); |
99 | |
100 | if ((attr->ia_valid & ATTR_SIZE) && |
101 | (attr->ia_size != inode->i_size)) |
102 | return -EINVAL; |
103 | setattr_copy(&nop_mnt_idmap, inode, attr); |
104 | mark_inode_dirty(inode); |
105 | return 0; |
106 | } |
107 | |
108 | |
109 | static int |
110 | spufs_new_file(struct super_block *sb, struct dentry *dentry, |
111 | const struct file_operations *fops, umode_t mode, |
112 | size_t size, struct spu_context *ctx) |
113 | { |
114 | static const struct inode_operations spufs_file_iops = { |
115 | .setattr = spufs_setattr, |
116 | }; |
117 | struct inode *inode; |
118 | int ret; |
119 | |
120 | ret = -ENOSPC; |
121 | inode = spufs_new_inode(sb, S_IFREG | mode); |
122 | if (!inode) |
123 | goto out; |
124 | |
125 | ret = 0; |
126 | inode->i_op = &spufs_file_iops; |
127 | inode->i_fop = fops; |
128 | inode->i_size = size; |
129 | inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); |
130 | d_add(dentry, inode); |
131 | out: |
132 | return ret; |
133 | } |
134 | |
135 | static void |
136 | spufs_evict_inode(struct inode *inode) |
137 | { |
138 | struct spufs_inode_info *ei = SPUFS_I(inode); |
139 | clear_inode(inode); |
140 | if (ei->i_ctx) |
141 | put_spu_context(ctx: ei->i_ctx); |
142 | if (ei->i_gang) |
143 | put_spu_gang(gang: ei->i_gang); |
144 | } |
145 | |
146 | static void spufs_prune_dir(struct dentry *dir) |
147 | { |
148 | struct dentry *dentry, *tmp; |
149 | |
150 | inode_lock(inode: d_inode(dentry: dir)); |
151 | list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) { |
152 | spin_lock(lock: &dentry->d_lock); |
153 | if (simple_positive(dentry)) { |
154 | dget_dlock(dentry); |
155 | __d_drop(dentry); |
156 | spin_unlock(lock: &dentry->d_lock); |
157 | simple_unlink(d_inode(dentry: dir), dentry); |
158 | /* XXX: what was dcache_lock protecting here? Other |
159 | * filesystems (IB, configfs) release dcache_lock |
160 | * before unlink */ |
161 | dput(dentry); |
162 | } else { |
163 | spin_unlock(lock: &dentry->d_lock); |
164 | } |
165 | } |
166 | shrink_dcache_parent(dir); |
167 | inode_unlock(inode: d_inode(dentry: dir)); |
168 | } |
169 | |
170 | /* Caller must hold parent->i_mutex */ |
171 | static int spufs_rmdir(struct inode *parent, struct dentry *dir) |
172 | { |
173 | /* remove all entries */ |
174 | int res; |
175 | spufs_prune_dir(dir); |
176 | d_drop(dentry: dir); |
177 | res = simple_rmdir(parent, dir); |
178 | /* We have to give up the mm_struct */ |
179 | spu_forget(SPUFS_I(d_inode(dir))->i_ctx); |
180 | return res; |
181 | } |
182 | |
183 | static int spufs_fill_dir(struct dentry *dir, |
184 | const struct spufs_tree_descr *files, umode_t mode, |
185 | struct spu_context *ctx) |
186 | { |
187 | while (files->name && files->name[0]) { |
188 | int ret; |
189 | struct dentry *dentry = d_alloc_name(dir, files->name); |
190 | if (!dentry) |
191 | return -ENOMEM; |
192 | ret = spufs_new_file(sb: dir->d_sb, dentry, fops: files->ops, |
193 | mode: files->mode & mode, size: files->size, ctx); |
194 | if (ret) |
195 | return ret; |
196 | files++; |
197 | } |
198 | return 0; |
199 | } |
200 | |
201 | static int spufs_dir_close(struct inode *inode, struct file *file) |
202 | { |
203 | struct inode *parent; |
204 | struct dentry *dir; |
205 | int ret; |
206 | |
207 | dir = file->f_path.dentry; |
208 | parent = d_inode(dentry: dir->d_parent); |
209 | |
210 | inode_lock_nested(inode: parent, subclass: I_MUTEX_PARENT); |
211 | ret = spufs_rmdir(parent, dir); |
212 | inode_unlock(inode: parent); |
213 | WARN_ON(ret); |
214 | |
215 | return dcache_dir_close(inode, file); |
216 | } |
217 | |
218 | const struct file_operations spufs_context_fops = { |
219 | .open = dcache_dir_open, |
220 | .release = spufs_dir_close, |
221 | .llseek = dcache_dir_lseek, |
222 | .read = generic_read_dir, |
223 | .iterate_shared = dcache_readdir, |
224 | .fsync = noop_fsync, |
225 | }; |
226 | EXPORT_SYMBOL_GPL(spufs_context_fops); |
227 | |
228 | static int |
229 | spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, |
230 | umode_t mode) |
231 | { |
232 | int ret; |
233 | struct inode *inode; |
234 | struct spu_context *ctx; |
235 | |
236 | inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR); |
237 | if (!inode) |
238 | return -ENOSPC; |
239 | |
240 | inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR); |
241 | ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ |
242 | SPUFS_I(inode)->i_ctx = ctx; |
243 | if (!ctx) { |
244 | iput(inode); |
245 | return -ENOSPC; |
246 | } |
247 | |
248 | ctx->flags = flags; |
249 | inode->i_op = &simple_dir_inode_operations; |
250 | inode->i_fop = &simple_dir_operations; |
251 | |
252 | inode_lock(inode); |
253 | |
254 | dget(dentry); |
255 | inc_nlink(inode: dir); |
256 | inc_nlink(inode); |
257 | |
258 | d_instantiate(dentry, inode); |
259 | |
260 | if (flags & SPU_CREATE_NOSCHED) |
261 | ret = spufs_fill_dir(dir: dentry, files: spufs_dir_nosched_contents, |
262 | mode, ctx); |
263 | else |
264 | ret = spufs_fill_dir(dir: dentry, files: spufs_dir_contents, mode, ctx); |
265 | |
266 | if (!ret && spufs_get_sb_info(sb: dir->i_sb)->debug) |
267 | ret = spufs_fill_dir(dir: dentry, files: spufs_dir_debug_contents, |
268 | mode, ctx); |
269 | |
270 | if (ret) |
271 | spufs_rmdir(parent: dir, dir: dentry); |
272 | |
273 | inode_unlock(inode); |
274 | |
275 | return ret; |
276 | } |
277 | |
278 | static int spufs_context_open(const struct path *path) |
279 | { |
280 | int ret; |
281 | struct file *filp; |
282 | |
283 | ret = get_unused_fd_flags(flags: 0); |
284 | if (ret < 0) |
285 | return ret; |
286 | |
287 | filp = dentry_open(path, O_RDONLY, current_cred()); |
288 | if (IS_ERR(ptr: filp)) { |
289 | put_unused_fd(fd: ret); |
290 | return PTR_ERR(ptr: filp); |
291 | } |
292 | |
293 | filp->f_op = &spufs_context_fops; |
294 | fd_install(fd: ret, file: filp); |
295 | return ret; |
296 | } |
297 | |
298 | static struct spu_context * |
299 | spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, |
300 | struct file *filp) |
301 | { |
302 | struct spu_context *tmp, *neighbor, *err; |
303 | int count, node; |
304 | int aff_supp; |
305 | |
306 | aff_supp = !list_empty(head: &(list_entry(cbe_spu_info[0].spus.next, |
307 | struct spu, cbe_list))->aff_list); |
308 | |
309 | if (!aff_supp) |
310 | return ERR_PTR(error: -EINVAL); |
311 | |
312 | if (flags & SPU_CREATE_GANG) |
313 | return ERR_PTR(error: -EINVAL); |
314 | |
315 | if (flags & SPU_CREATE_AFFINITY_MEM && |
316 | gang->aff_ref_ctx && |
317 | gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) |
318 | return ERR_PTR(error: -EEXIST); |
319 | |
320 | if (gang->aff_flags & AFF_MERGED) |
321 | return ERR_PTR(error: -EBUSY); |
322 | |
323 | neighbor = NULL; |
324 | if (flags & SPU_CREATE_AFFINITY_SPU) { |
325 | if (!filp || filp->f_op != &spufs_context_fops) |
326 | return ERR_PTR(error: -EINVAL); |
327 | |
328 | neighbor = get_spu_context( |
329 | SPUFS_I(file_inode(filp))->i_ctx); |
330 | |
331 | if (!list_empty(head: &neighbor->aff_list) && !(neighbor->aff_head) && |
332 | !list_is_last(list: &neighbor->aff_list, head: &gang->aff_list_head) && |
333 | !list_entry(neighbor->aff_list.next, struct spu_context, |
334 | aff_list)->aff_head) { |
335 | err = ERR_PTR(error: -EEXIST); |
336 | goto out_put_neighbor; |
337 | } |
338 | |
339 | if (gang != neighbor->gang) { |
340 | err = ERR_PTR(error: -EINVAL); |
341 | goto out_put_neighbor; |
342 | } |
343 | |
344 | count = 1; |
345 | list_for_each_entry(tmp, &gang->aff_list_head, aff_list) |
346 | count++; |
347 | if (list_empty(head: &neighbor->aff_list)) |
348 | count++; |
349 | |
350 | for (node = 0; node < MAX_NUMNODES; node++) { |
351 | if ((cbe_spu_info[node].n_spus - atomic_read( |
352 | &cbe_spu_info[node].reserved_spus)) >= count) |
353 | break; |
354 | } |
355 | |
356 | if (node == MAX_NUMNODES) { |
357 | err = ERR_PTR(error: -EEXIST); |
358 | goto out_put_neighbor; |
359 | } |
360 | } |
361 | |
362 | return neighbor; |
363 | |
364 | out_put_neighbor: |
365 | put_spu_context(ctx: neighbor); |
366 | return err; |
367 | } |
368 | |
369 | static void |
370 | spufs_set_affinity(unsigned int flags, struct spu_context *ctx, |
371 | struct spu_context *neighbor) |
372 | { |
373 | if (flags & SPU_CREATE_AFFINITY_MEM) |
374 | ctx->gang->aff_ref_ctx = ctx; |
375 | |
376 | if (flags & SPU_CREATE_AFFINITY_SPU) { |
377 | if (list_empty(head: &neighbor->aff_list)) { |
378 | list_add_tail(new: &neighbor->aff_list, |
379 | head: &ctx->gang->aff_list_head); |
380 | neighbor->aff_head = 1; |
381 | } |
382 | |
383 | if (list_is_last(list: &neighbor->aff_list, head: &ctx->gang->aff_list_head) |
384 | || list_entry(neighbor->aff_list.next, struct spu_context, |
385 | aff_list)->aff_head) { |
386 | list_add(new: &ctx->aff_list, head: &neighbor->aff_list); |
387 | } else { |
388 | list_add_tail(new: &ctx->aff_list, head: &neighbor->aff_list); |
389 | if (neighbor->aff_head) { |
390 | neighbor->aff_head = 0; |
391 | ctx->aff_head = 1; |
392 | } |
393 | } |
394 | |
395 | if (!ctx->gang->aff_ref_ctx) |
396 | ctx->gang->aff_ref_ctx = ctx; |
397 | } |
398 | } |
399 | |
400 | static int |
401 | spufs_create_context(struct inode *inode, struct dentry *dentry, |
402 | struct vfsmount *mnt, int flags, umode_t mode, |
403 | struct file *aff_filp) |
404 | { |
405 | int ret; |
406 | int affinity; |
407 | struct spu_gang *gang; |
408 | struct spu_context *neighbor; |
409 | struct path path = {.mnt = mnt, .dentry = dentry}; |
410 | |
411 | if ((flags & SPU_CREATE_NOSCHED) && |
412 | !capable(CAP_SYS_NICE)) |
413 | return -EPERM; |
414 | |
415 | if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) |
416 | == SPU_CREATE_ISOLATE) |
417 | return -EINVAL; |
418 | |
419 | if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) |
420 | return -ENODEV; |
421 | |
422 | gang = NULL; |
423 | neighbor = NULL; |
424 | affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU); |
425 | if (affinity) { |
426 | gang = SPUFS_I(inode)->i_gang; |
427 | if (!gang) |
428 | return -EINVAL; |
429 | mutex_lock(&gang->aff_mutex); |
430 | neighbor = spufs_assert_affinity(flags, gang, filp: aff_filp); |
431 | if (IS_ERR(ptr: neighbor)) { |
432 | ret = PTR_ERR(ptr: neighbor); |
433 | goto out_aff_unlock; |
434 | } |
435 | } |
436 | |
437 | ret = spufs_mkdir(dir: inode, dentry, flags, mode: mode & 0777); |
438 | if (ret) |
439 | goto out_aff_unlock; |
440 | |
441 | if (affinity) { |
442 | spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx, |
443 | neighbor); |
444 | if (neighbor) |
445 | put_spu_context(ctx: neighbor); |
446 | } |
447 | |
448 | ret = spufs_context_open(path: &path); |
449 | if (ret < 0) |
450 | WARN_ON(spufs_rmdir(inode, dentry)); |
451 | |
452 | out_aff_unlock: |
453 | if (affinity) |
454 | mutex_unlock(lock: &gang->aff_mutex); |
455 | return ret; |
456 | } |
457 | |
458 | static int |
459 | spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode) |
460 | { |
461 | int ret; |
462 | struct inode *inode; |
463 | struct spu_gang *gang; |
464 | |
465 | ret = -ENOSPC; |
466 | inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR); |
467 | if (!inode) |
468 | goto out; |
469 | |
470 | ret = 0; |
471 | inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR); |
472 | gang = alloc_spu_gang(); |
473 | SPUFS_I(inode)->i_ctx = NULL; |
474 | SPUFS_I(inode)->i_gang = gang; |
475 | if (!gang) { |
476 | ret = -ENOMEM; |
477 | goto out_iput; |
478 | } |
479 | |
480 | inode->i_op = &simple_dir_inode_operations; |
481 | inode->i_fop = &simple_dir_operations; |
482 | |
483 | d_instantiate(dentry, inode); |
484 | inc_nlink(inode: dir); |
485 | inc_nlink(inode: d_inode(dentry)); |
486 | return ret; |
487 | |
488 | out_iput: |
489 | iput(inode); |
490 | out: |
491 | return ret; |
492 | } |
493 | |
494 | static int spufs_gang_open(const struct path *path) |
495 | { |
496 | int ret; |
497 | struct file *filp; |
498 | |
499 | ret = get_unused_fd_flags(flags: 0); |
500 | if (ret < 0) |
501 | return ret; |
502 | |
503 | /* |
504 | * get references for dget and mntget, will be released |
505 | * in error path of *_open(). |
506 | */ |
507 | filp = dentry_open(path, O_RDONLY, current_cred()); |
508 | if (IS_ERR(ptr: filp)) { |
509 | put_unused_fd(fd: ret); |
510 | return PTR_ERR(ptr: filp); |
511 | } |
512 | |
513 | filp->f_op = &simple_dir_operations; |
514 | fd_install(fd: ret, file: filp); |
515 | return ret; |
516 | } |
517 | |
518 | static int spufs_create_gang(struct inode *inode, |
519 | struct dentry *dentry, |
520 | struct vfsmount *mnt, umode_t mode) |
521 | { |
522 | struct path path = {.mnt = mnt, .dentry = dentry}; |
523 | int ret; |
524 | |
525 | ret = spufs_mkgang(dir: inode, dentry, mode: mode & 0777); |
526 | if (!ret) { |
527 | ret = spufs_gang_open(path: &path); |
528 | if (ret < 0) { |
529 | int err = simple_rmdir(inode, dentry); |
530 | WARN_ON(err); |
531 | } |
532 | } |
533 | return ret; |
534 | } |
535 | |
536 | |
537 | static struct file_system_type spufs_type; |
538 | |
539 | long spufs_create(const struct path *path, struct dentry *dentry, |
540 | unsigned int flags, umode_t mode, struct file *filp) |
541 | { |
542 | struct inode *dir = d_inode(dentry: path->dentry); |
543 | int ret; |
544 | |
545 | /* check if we are on spufs */ |
546 | if (path->dentry->d_sb->s_type != &spufs_type) |
547 | return -EINVAL; |
548 | |
549 | /* don't accept undefined flags */ |
550 | if (flags & (~SPU_CREATE_FLAG_ALL)) |
551 | return -EINVAL; |
552 | |
553 | /* only threads can be underneath a gang */ |
554 | if (path->dentry != path->dentry->d_sb->s_root) |
555 | if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang) |
556 | return -EINVAL; |
557 | |
558 | mode &= ~current_umask(); |
559 | |
560 | if (flags & SPU_CREATE_GANG) |
561 | ret = spufs_create_gang(inode: dir, dentry, mnt: path->mnt, mode); |
562 | else |
563 | ret = spufs_create_context(inode: dir, dentry, mnt: path->mnt, flags, mode, |
564 | aff_filp: filp); |
565 | if (ret >= 0) |
566 | fsnotify_mkdir(dir, dentry); |
567 | |
568 | return ret; |
569 | } |
570 | |
571 | /* File system initialization */ |
572 | struct spufs_fs_context { |
573 | kuid_t uid; |
574 | kgid_t gid; |
575 | umode_t mode; |
576 | }; |
577 | |
578 | enum { |
579 | Opt_uid, Opt_gid, Opt_mode, Opt_debug, |
580 | }; |
581 | |
582 | static const struct fs_parameter_spec spufs_fs_parameters[] = { |
583 | fsparam_u32 ("gid" , Opt_gid), |
584 | fsparam_u32oct ("mode" , Opt_mode), |
585 | fsparam_u32 ("uid" , Opt_uid), |
586 | fsparam_flag ("debug" , Opt_debug), |
587 | {} |
588 | }; |
589 | |
590 | static int spufs_show_options(struct seq_file *m, struct dentry *root) |
591 | { |
592 | struct spufs_sb_info *sbi = spufs_get_sb_info(sb: root->d_sb); |
593 | struct inode *inode = root->d_inode; |
594 | |
595 | if (!uid_eq(left: inode->i_uid, GLOBAL_ROOT_UID)) |
596 | seq_printf(m, ",uid=%u" , |
597 | from_kuid_munged(&init_user_ns, inode->i_uid)); |
598 | if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID)) |
599 | seq_printf(m, ",gid=%u" , |
600 | from_kgid_munged(&init_user_ns, inode->i_gid)); |
601 | if ((inode->i_mode & S_IALLUGO) != 0775) |
602 | seq_printf(m, ",mode=%o" , inode->i_mode); |
603 | if (sbi->debug) |
604 | seq_puts(m, ",debug" ); |
605 | return 0; |
606 | } |
607 | |
608 | static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param) |
609 | { |
610 | struct spufs_fs_context *ctx = fc->fs_private; |
611 | struct spufs_sb_info *sbi = fc->s_fs_info; |
612 | struct fs_parse_result result; |
613 | kuid_t uid; |
614 | kgid_t gid; |
615 | int opt; |
616 | |
617 | opt = fs_parse(fc, desc: spufs_fs_parameters, param, result: &result); |
618 | if (opt < 0) |
619 | return opt; |
620 | |
621 | switch (opt) { |
622 | case Opt_uid: |
623 | uid = make_kuid(current_user_ns(), uid: result.uint_32); |
624 | if (!uid_valid(uid)) |
625 | return invalf(fc, "Unknown uid" ); |
626 | ctx->uid = uid; |
627 | break; |
628 | case Opt_gid: |
629 | gid = make_kgid(current_user_ns(), gid: result.uint_32); |
630 | if (!gid_valid(gid)) |
631 | return invalf(fc, "Unknown gid" ); |
632 | ctx->gid = gid; |
633 | break; |
634 | case Opt_mode: |
635 | ctx->mode = result.uint_32 & S_IALLUGO; |
636 | break; |
637 | case Opt_debug: |
638 | sbi->debug = true; |
639 | break; |
640 | } |
641 | |
642 | return 0; |
643 | } |
644 | |
645 | static void spufs_exit_isolated_loader(void) |
646 | { |
647 | free_pages(addr: (unsigned long) isolated_loader, |
648 | order: get_order(size: isolated_loader_size)); |
649 | } |
650 | |
651 | static void __init |
652 | spufs_init_isolated_loader(void) |
653 | { |
654 | struct device_node *dn; |
655 | const char *loader; |
656 | int size; |
657 | |
658 | dn = of_find_node_by_path(path: "/spu-isolation" ); |
659 | if (!dn) |
660 | return; |
661 | |
662 | loader = of_get_property(node: dn, name: "loader" , lenp: &size); |
663 | of_node_put(node: dn); |
664 | if (!loader) |
665 | return; |
666 | |
667 | /* the loader must be align on a 16 byte boundary */ |
668 | isolated_loader = (char *)__get_free_pages(GFP_KERNEL, order: get_order(size)); |
669 | if (!isolated_loader) |
670 | return; |
671 | |
672 | isolated_loader_size = size; |
673 | memcpy(isolated_loader, loader, size); |
674 | printk(KERN_INFO "spufs: SPU isolation mode enabled\n" ); |
675 | } |
676 | |
677 | static int spufs_create_root(struct super_block *sb, struct fs_context *fc) |
678 | { |
679 | struct spufs_fs_context *ctx = fc->fs_private; |
680 | struct inode *inode; |
681 | |
682 | if (!spu_management_ops) |
683 | return -ENODEV; |
684 | |
685 | inode = spufs_new_inode(sb, S_IFDIR | ctx->mode); |
686 | if (!inode) |
687 | return -ENOMEM; |
688 | |
689 | inode->i_uid = ctx->uid; |
690 | inode->i_gid = ctx->gid; |
691 | inode->i_op = &simple_dir_inode_operations; |
692 | inode->i_fop = &simple_dir_operations; |
693 | SPUFS_I(inode)->i_ctx = NULL; |
694 | inc_nlink(inode); |
695 | |
696 | sb->s_root = d_make_root(inode); |
697 | if (!sb->s_root) |
698 | return -ENOMEM; |
699 | return 0; |
700 | } |
701 | |
702 | static const struct super_operations spufs_ops = { |
703 | .alloc_inode = spufs_alloc_inode, |
704 | .free_inode = spufs_free_inode, |
705 | .statfs = simple_statfs, |
706 | .evict_inode = spufs_evict_inode, |
707 | .show_options = spufs_show_options, |
708 | }; |
709 | |
710 | static int spufs_fill_super(struct super_block *sb, struct fs_context *fc) |
711 | { |
712 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
713 | sb->s_blocksize = PAGE_SIZE; |
714 | sb->s_blocksize_bits = PAGE_SHIFT; |
715 | sb->s_magic = SPUFS_MAGIC; |
716 | sb->s_op = &spufs_ops; |
717 | |
718 | return spufs_create_root(sb, fc); |
719 | } |
720 | |
721 | static int spufs_get_tree(struct fs_context *fc) |
722 | { |
723 | return get_tree_single(fc, fill_super: spufs_fill_super); |
724 | } |
725 | |
726 | static void spufs_free_fc(struct fs_context *fc) |
727 | { |
728 | kfree(objp: fc->s_fs_info); |
729 | } |
730 | |
731 | static const struct fs_context_operations spufs_context_ops = { |
732 | .free = spufs_free_fc, |
733 | .parse_param = spufs_parse_param, |
734 | .get_tree = spufs_get_tree, |
735 | }; |
736 | |
737 | static int spufs_init_fs_context(struct fs_context *fc) |
738 | { |
739 | struct spufs_fs_context *ctx; |
740 | struct spufs_sb_info *sbi; |
741 | |
742 | ctx = kzalloc(size: sizeof(struct spufs_fs_context), GFP_KERNEL); |
743 | if (!ctx) |
744 | goto nomem; |
745 | |
746 | sbi = kzalloc(size: sizeof(struct spufs_sb_info), GFP_KERNEL); |
747 | if (!sbi) |
748 | goto nomem_ctx; |
749 | |
750 | ctx->uid = current_uid(); |
751 | ctx->gid = current_gid(); |
752 | ctx->mode = 0755; |
753 | |
754 | fc->fs_private = ctx; |
755 | fc->s_fs_info = sbi; |
756 | fc->ops = &spufs_context_ops; |
757 | return 0; |
758 | |
759 | nomem_ctx: |
760 | kfree(objp: ctx); |
761 | nomem: |
762 | return -ENOMEM; |
763 | } |
764 | |
765 | static struct file_system_type spufs_type = { |
766 | .owner = THIS_MODULE, |
767 | .name = "spufs" , |
768 | .init_fs_context = spufs_init_fs_context, |
769 | .parameters = spufs_fs_parameters, |
770 | .kill_sb = kill_litter_super, |
771 | }; |
772 | MODULE_ALIAS_FS("spufs" ); |
773 | |
774 | static int __init spufs_init(void) |
775 | { |
776 | int ret; |
777 | |
778 | ret = -ENODEV; |
779 | if (!spu_management_ops) |
780 | goto out; |
781 | |
782 | ret = -ENOMEM; |
783 | spufs_inode_cache = kmem_cache_create(name: "spufs_inode_cache" , |
784 | size: sizeof(struct spufs_inode_info), align: 0, |
785 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, ctor: spufs_init_once); |
786 | |
787 | if (!spufs_inode_cache) |
788 | goto out; |
789 | ret = spu_sched_init(); |
790 | if (ret) |
791 | goto out_cache; |
792 | ret = register_spu_syscalls(&spufs_calls); |
793 | if (ret) |
794 | goto out_sched; |
795 | ret = register_filesystem(&spufs_type); |
796 | if (ret) |
797 | goto out_syscalls; |
798 | |
799 | spufs_init_isolated_loader(); |
800 | |
801 | return 0; |
802 | |
803 | out_syscalls: |
804 | unregister_spu_syscalls(&spufs_calls); |
805 | out_sched: |
806 | spu_sched_exit(); |
807 | out_cache: |
808 | kmem_cache_destroy(s: spufs_inode_cache); |
809 | out: |
810 | return ret; |
811 | } |
812 | module_init(spufs_init); |
813 | |
814 | static void __exit spufs_exit(void) |
815 | { |
816 | spu_sched_exit(); |
817 | spufs_exit_isolated_loader(); |
818 | unregister_spu_syscalls(&spufs_calls); |
819 | unregister_filesystem(&spufs_type); |
820 | kmem_cache_destroy(s: spufs_inode_cache); |
821 | } |
822 | module_exit(spufs_exit); |
823 | |
824 | MODULE_LICENSE("GPL" ); |
825 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>" ); |
826 | |
827 | |