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; |
149 | struct hlist_node *n; |
150 | |
151 | inode_lock(inode: d_inode(dentry: dir)); |
152 | hlist_for_each_entry_safe(dentry, n, &dir->d_children, d_sib) { |
153 | spin_lock(lock: &dentry->d_lock); |
154 | if (simple_positive(dentry)) { |
155 | dget_dlock(dentry); |
156 | __d_drop(dentry); |
157 | spin_unlock(lock: &dentry->d_lock); |
158 | simple_unlink(d_inode(dentry: dir), dentry); |
159 | /* XXX: what was dcache_lock protecting here? Other |
160 | * filesystems (IB, configfs) release dcache_lock |
161 | * before unlink */ |
162 | dput(dentry); |
163 | } else { |
164 | spin_unlock(lock: &dentry->d_lock); |
165 | } |
166 | } |
167 | shrink_dcache_parent(dir); |
168 | inode_unlock(inode: d_inode(dentry: dir)); |
169 | } |
170 | |
171 | /* Caller must hold parent->i_mutex */ |
172 | static int spufs_rmdir(struct inode *parent, struct dentry *dir) |
173 | { |
174 | /* remove all entries */ |
175 | int res; |
176 | spufs_prune_dir(dir); |
177 | d_drop(dentry: dir); |
178 | res = simple_rmdir(parent, dir); |
179 | /* We have to give up the mm_struct */ |
180 | spu_forget(SPUFS_I(d_inode(dir))->i_ctx); |
181 | return res; |
182 | } |
183 | |
184 | static int spufs_fill_dir(struct dentry *dir, |
185 | const struct spufs_tree_descr *files, umode_t mode, |
186 | struct spu_context *ctx) |
187 | { |
188 | while (files->name && files->name[0]) { |
189 | int ret; |
190 | struct dentry *dentry = d_alloc_name(dir, files->name); |
191 | if (!dentry) |
192 | return -ENOMEM; |
193 | ret = spufs_new_file(sb: dir->d_sb, dentry, fops: files->ops, |
194 | mode: files->mode & mode, size: files->size, ctx); |
195 | if (ret) |
196 | return ret; |
197 | files++; |
198 | } |
199 | return 0; |
200 | } |
201 | |
202 | static int spufs_dir_close(struct inode *inode, struct file *file) |
203 | { |
204 | struct inode *parent; |
205 | struct dentry *dir; |
206 | int ret; |
207 | |
208 | dir = file->f_path.dentry; |
209 | parent = d_inode(dentry: dir->d_parent); |
210 | |
211 | inode_lock_nested(inode: parent, subclass: I_MUTEX_PARENT); |
212 | ret = spufs_rmdir(parent, dir); |
213 | inode_unlock(inode: parent); |
214 | WARN_ON(ret); |
215 | |
216 | return dcache_dir_close(inode, file); |
217 | } |
218 | |
219 | const struct file_operations spufs_context_fops = { |
220 | .open = dcache_dir_open, |
221 | .release = spufs_dir_close, |
222 | .llseek = dcache_dir_lseek, |
223 | .read = generic_read_dir, |
224 | .iterate_shared = dcache_readdir, |
225 | .fsync = noop_fsync, |
226 | }; |
227 | EXPORT_SYMBOL_GPL(spufs_context_fops); |
228 | |
229 | static int |
230 | spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, |
231 | umode_t mode) |
232 | { |
233 | int ret; |
234 | struct inode *inode; |
235 | struct spu_context *ctx; |
236 | |
237 | inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR); |
238 | if (!inode) |
239 | return -ENOSPC; |
240 | |
241 | inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR); |
242 | ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ |
243 | SPUFS_I(inode)->i_ctx = ctx; |
244 | if (!ctx) { |
245 | iput(inode); |
246 | return -ENOSPC; |
247 | } |
248 | |
249 | ctx->flags = flags; |
250 | inode->i_op = &simple_dir_inode_operations; |
251 | inode->i_fop = &simple_dir_operations; |
252 | |
253 | inode_lock(inode); |
254 | |
255 | dget(dentry); |
256 | inc_nlink(inode: dir); |
257 | inc_nlink(inode); |
258 | |
259 | d_instantiate(dentry, inode); |
260 | |
261 | if (flags & SPU_CREATE_NOSCHED) |
262 | ret = spufs_fill_dir(dir: dentry, files: spufs_dir_nosched_contents, |
263 | mode, ctx); |
264 | else |
265 | ret = spufs_fill_dir(dir: dentry, files: spufs_dir_contents, mode, ctx); |
266 | |
267 | if (!ret && spufs_get_sb_info(sb: dir->i_sb)->debug) |
268 | ret = spufs_fill_dir(dir: dentry, files: spufs_dir_debug_contents, |
269 | mode, ctx); |
270 | |
271 | if (ret) |
272 | spufs_rmdir(parent: dir, dir: dentry); |
273 | |
274 | inode_unlock(inode); |
275 | |
276 | return ret; |
277 | } |
278 | |
279 | static int spufs_context_open(const struct path *path) |
280 | { |
281 | int ret; |
282 | struct file *filp; |
283 | |
284 | ret = get_unused_fd_flags(flags: 0); |
285 | if (ret < 0) |
286 | return ret; |
287 | |
288 | filp = dentry_open(path, O_RDONLY, current_cred()); |
289 | if (IS_ERR(ptr: filp)) { |
290 | put_unused_fd(fd: ret); |
291 | return PTR_ERR(ptr: filp); |
292 | } |
293 | |
294 | filp->f_op = &spufs_context_fops; |
295 | fd_install(fd: ret, file: filp); |
296 | return ret; |
297 | } |
298 | |
299 | static struct spu_context * |
300 | spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, |
301 | struct file *filp) |
302 | { |
303 | struct spu_context *tmp, *neighbor, *err; |
304 | int count, node; |
305 | int aff_supp; |
306 | |
307 | aff_supp = !list_empty(head: &(list_entry(cbe_spu_info[0].spus.next, |
308 | struct spu, cbe_list))->aff_list); |
309 | |
310 | if (!aff_supp) |
311 | return ERR_PTR(error: -EINVAL); |
312 | |
313 | if (flags & SPU_CREATE_GANG) |
314 | return ERR_PTR(error: -EINVAL); |
315 | |
316 | if (flags & SPU_CREATE_AFFINITY_MEM && |
317 | gang->aff_ref_ctx && |
318 | gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) |
319 | return ERR_PTR(error: -EEXIST); |
320 | |
321 | if (gang->aff_flags & AFF_MERGED) |
322 | return ERR_PTR(error: -EBUSY); |
323 | |
324 | neighbor = NULL; |
325 | if (flags & SPU_CREATE_AFFINITY_SPU) { |
326 | if (!filp || filp->f_op != &spufs_context_fops) |
327 | return ERR_PTR(error: -EINVAL); |
328 | |
329 | neighbor = get_spu_context( |
330 | SPUFS_I(file_inode(filp))->i_ctx); |
331 | |
332 | if (!list_empty(head: &neighbor->aff_list) && !(neighbor->aff_head) && |
333 | !list_is_last(list: &neighbor->aff_list, head: &gang->aff_list_head) && |
334 | !list_entry(neighbor->aff_list.next, struct spu_context, |
335 | aff_list)->aff_head) { |
336 | err = ERR_PTR(error: -EEXIST); |
337 | goto out_put_neighbor; |
338 | } |
339 | |
340 | if (gang != neighbor->gang) { |
341 | err = ERR_PTR(error: -EINVAL); |
342 | goto out_put_neighbor; |
343 | } |
344 | |
345 | count = 1; |
346 | list_for_each_entry(tmp, &gang->aff_list_head, aff_list) |
347 | count++; |
348 | if (list_empty(head: &neighbor->aff_list)) |
349 | count++; |
350 | |
351 | for (node = 0; node < MAX_NUMNODES; node++) { |
352 | if ((cbe_spu_info[node].n_spus - atomic_read( |
353 | &cbe_spu_info[node].reserved_spus)) >= count) |
354 | break; |
355 | } |
356 | |
357 | if (node == MAX_NUMNODES) { |
358 | err = ERR_PTR(error: -EEXIST); |
359 | goto out_put_neighbor; |
360 | } |
361 | } |
362 | |
363 | return neighbor; |
364 | |
365 | out_put_neighbor: |
366 | put_spu_context(ctx: neighbor); |
367 | return err; |
368 | } |
369 | |
370 | static void |
371 | spufs_set_affinity(unsigned int flags, struct spu_context *ctx, |
372 | struct spu_context *neighbor) |
373 | { |
374 | if (flags & SPU_CREATE_AFFINITY_MEM) |
375 | ctx->gang->aff_ref_ctx = ctx; |
376 | |
377 | if (flags & SPU_CREATE_AFFINITY_SPU) { |
378 | if (list_empty(head: &neighbor->aff_list)) { |
379 | list_add_tail(new: &neighbor->aff_list, |
380 | head: &ctx->gang->aff_list_head); |
381 | neighbor->aff_head = 1; |
382 | } |
383 | |
384 | if (list_is_last(list: &neighbor->aff_list, head: &ctx->gang->aff_list_head) |
385 | || list_entry(neighbor->aff_list.next, struct spu_context, |
386 | aff_list)->aff_head) { |
387 | list_add(new: &ctx->aff_list, head: &neighbor->aff_list); |
388 | } else { |
389 | list_add_tail(new: &ctx->aff_list, head: &neighbor->aff_list); |
390 | if (neighbor->aff_head) { |
391 | neighbor->aff_head = 0; |
392 | ctx->aff_head = 1; |
393 | } |
394 | } |
395 | |
396 | if (!ctx->gang->aff_ref_ctx) |
397 | ctx->gang->aff_ref_ctx = ctx; |
398 | } |
399 | } |
400 | |
401 | static int |
402 | spufs_create_context(struct inode *inode, struct dentry *dentry, |
403 | struct vfsmount *mnt, int flags, umode_t mode, |
404 | struct file *aff_filp) |
405 | { |
406 | int ret; |
407 | int affinity; |
408 | struct spu_gang *gang; |
409 | struct spu_context *neighbor; |
410 | struct path path = {.mnt = mnt, .dentry = dentry}; |
411 | |
412 | if ((flags & SPU_CREATE_NOSCHED) && |
413 | !capable(CAP_SYS_NICE)) |
414 | return -EPERM; |
415 | |
416 | if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) |
417 | == SPU_CREATE_ISOLATE) |
418 | return -EINVAL; |
419 | |
420 | if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) |
421 | return -ENODEV; |
422 | |
423 | gang = NULL; |
424 | neighbor = NULL; |
425 | affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU); |
426 | if (affinity) { |
427 | gang = SPUFS_I(inode)->i_gang; |
428 | if (!gang) |
429 | return -EINVAL; |
430 | mutex_lock(&gang->aff_mutex); |
431 | neighbor = spufs_assert_affinity(flags, gang, filp: aff_filp); |
432 | if (IS_ERR(ptr: neighbor)) { |
433 | ret = PTR_ERR(ptr: neighbor); |
434 | goto out_aff_unlock; |
435 | } |
436 | } |
437 | |
438 | ret = spufs_mkdir(dir: inode, dentry, flags, mode: mode & 0777); |
439 | if (ret) |
440 | goto out_aff_unlock; |
441 | |
442 | if (affinity) { |
443 | spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx, |
444 | neighbor); |
445 | if (neighbor) |
446 | put_spu_context(ctx: neighbor); |
447 | } |
448 | |
449 | ret = spufs_context_open(path: &path); |
450 | if (ret < 0) |
451 | WARN_ON(spufs_rmdir(inode, dentry)); |
452 | |
453 | out_aff_unlock: |
454 | if (affinity) |
455 | mutex_unlock(lock: &gang->aff_mutex); |
456 | return ret; |
457 | } |
458 | |
459 | static int |
460 | spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode) |
461 | { |
462 | int ret; |
463 | struct inode *inode; |
464 | struct spu_gang *gang; |
465 | |
466 | ret = -ENOSPC; |
467 | inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR); |
468 | if (!inode) |
469 | goto out; |
470 | |
471 | ret = 0; |
472 | inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR); |
473 | gang = alloc_spu_gang(); |
474 | SPUFS_I(inode)->i_ctx = NULL; |
475 | SPUFS_I(inode)->i_gang = gang; |
476 | if (!gang) { |
477 | ret = -ENOMEM; |
478 | goto out_iput; |
479 | } |
480 | |
481 | inode->i_op = &simple_dir_inode_operations; |
482 | inode->i_fop = &simple_dir_operations; |
483 | |
484 | d_instantiate(dentry, inode); |
485 | inc_nlink(inode: dir); |
486 | inc_nlink(inode: d_inode(dentry)); |
487 | return ret; |
488 | |
489 | out_iput: |
490 | iput(inode); |
491 | out: |
492 | return ret; |
493 | } |
494 | |
495 | static int spufs_gang_open(const struct path *path) |
496 | { |
497 | int ret; |
498 | struct file *filp; |
499 | |
500 | ret = get_unused_fd_flags(flags: 0); |
501 | if (ret < 0) |
502 | return ret; |
503 | |
504 | /* |
505 | * get references for dget and mntget, will be released |
506 | * in error path of *_open(). |
507 | */ |
508 | filp = dentry_open(path, O_RDONLY, current_cred()); |
509 | if (IS_ERR(ptr: filp)) { |
510 | put_unused_fd(fd: ret); |
511 | return PTR_ERR(ptr: filp); |
512 | } |
513 | |
514 | filp->f_op = &simple_dir_operations; |
515 | fd_install(fd: ret, file: filp); |
516 | return ret; |
517 | } |
518 | |
519 | static int spufs_create_gang(struct inode *inode, |
520 | struct dentry *dentry, |
521 | struct vfsmount *mnt, umode_t mode) |
522 | { |
523 | struct path path = {.mnt = mnt, .dentry = dentry}; |
524 | int ret; |
525 | |
526 | ret = spufs_mkgang(dir: inode, dentry, mode: mode & 0777); |
527 | if (!ret) { |
528 | ret = spufs_gang_open(path: &path); |
529 | if (ret < 0) { |
530 | int err = simple_rmdir(inode, dentry); |
531 | WARN_ON(err); |
532 | } |
533 | } |
534 | return ret; |
535 | } |
536 | |
537 | |
538 | static struct file_system_type spufs_type; |
539 | |
540 | long spufs_create(const struct path *path, struct dentry *dentry, |
541 | unsigned int flags, umode_t mode, struct file *filp) |
542 | { |
543 | struct inode *dir = d_inode(dentry: path->dentry); |
544 | int ret; |
545 | |
546 | /* check if we are on spufs */ |
547 | if (path->dentry->d_sb->s_type != &spufs_type) |
548 | return -EINVAL; |
549 | |
550 | /* don't accept undefined flags */ |
551 | if (flags & (~SPU_CREATE_FLAG_ALL)) |
552 | return -EINVAL; |
553 | |
554 | /* only threads can be underneath a gang */ |
555 | if (path->dentry != path->dentry->d_sb->s_root) |
556 | if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang) |
557 | return -EINVAL; |
558 | |
559 | mode &= ~current_umask(); |
560 | |
561 | if (flags & SPU_CREATE_GANG) |
562 | ret = spufs_create_gang(inode: dir, dentry, mnt: path->mnt, mode); |
563 | else |
564 | ret = spufs_create_context(inode: dir, dentry, mnt: path->mnt, flags, mode, |
565 | aff_filp: filp); |
566 | if (ret >= 0) |
567 | fsnotify_mkdir(dir, dentry); |
568 | |
569 | return ret; |
570 | } |
571 | |
572 | /* File system initialization */ |
573 | struct spufs_fs_context { |
574 | kuid_t uid; |
575 | kgid_t gid; |
576 | umode_t mode; |
577 | }; |
578 | |
579 | enum { |
580 | Opt_uid, Opt_gid, Opt_mode, Opt_debug, |
581 | }; |
582 | |
583 | static const struct fs_parameter_spec spufs_fs_parameters[] = { |
584 | fsparam_u32 ("gid" , Opt_gid), |
585 | fsparam_u32oct ("mode" , Opt_mode), |
586 | fsparam_u32 ("uid" , Opt_uid), |
587 | fsparam_flag ("debug" , Opt_debug), |
588 | {} |
589 | }; |
590 | |
591 | static int spufs_show_options(struct seq_file *m, struct dentry *root) |
592 | { |
593 | struct spufs_sb_info *sbi = spufs_get_sb_info(sb: root->d_sb); |
594 | struct inode *inode = root->d_inode; |
595 | |
596 | if (!uid_eq(left: inode->i_uid, GLOBAL_ROOT_UID)) |
597 | seq_printf(m, ",uid=%u" , |
598 | from_kuid_munged(&init_user_ns, inode->i_uid)); |
599 | if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID)) |
600 | seq_printf(m, ",gid=%u" , |
601 | from_kgid_munged(&init_user_ns, inode->i_gid)); |
602 | if ((inode->i_mode & S_IALLUGO) != 0775) |
603 | seq_printf(m, ",mode=%o" , inode->i_mode); |
604 | if (sbi->debug) |
605 | seq_puts(m, ",debug" ); |
606 | return 0; |
607 | } |
608 | |
609 | static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param) |
610 | { |
611 | struct spufs_fs_context *ctx = fc->fs_private; |
612 | struct spufs_sb_info *sbi = fc->s_fs_info; |
613 | struct fs_parse_result result; |
614 | kuid_t uid; |
615 | kgid_t gid; |
616 | int opt; |
617 | |
618 | opt = fs_parse(fc, desc: spufs_fs_parameters, param, result: &result); |
619 | if (opt < 0) |
620 | return opt; |
621 | |
622 | switch (opt) { |
623 | case Opt_uid: |
624 | uid = make_kuid(current_user_ns(), uid: result.uint_32); |
625 | if (!uid_valid(uid)) |
626 | return invalf(fc, "Unknown uid" ); |
627 | ctx->uid = uid; |
628 | break; |
629 | case Opt_gid: |
630 | gid = make_kgid(current_user_ns(), gid: result.uint_32); |
631 | if (!gid_valid(gid)) |
632 | return invalf(fc, "Unknown gid" ); |
633 | ctx->gid = gid; |
634 | break; |
635 | case Opt_mode: |
636 | ctx->mode = result.uint_32 & S_IALLUGO; |
637 | break; |
638 | case Opt_debug: |
639 | sbi->debug = true; |
640 | break; |
641 | } |
642 | |
643 | return 0; |
644 | } |
645 | |
646 | static void spufs_exit_isolated_loader(void) |
647 | { |
648 | free_pages(addr: (unsigned long) isolated_loader, |
649 | order: get_order(size: isolated_loader_size)); |
650 | } |
651 | |
652 | static void __init |
653 | spufs_init_isolated_loader(void) |
654 | { |
655 | struct device_node *dn; |
656 | const char *loader; |
657 | int size; |
658 | |
659 | dn = of_find_node_by_path(path: "/spu-isolation" ); |
660 | if (!dn) |
661 | return; |
662 | |
663 | loader = of_get_property(node: dn, name: "loader" , lenp: &size); |
664 | of_node_put(node: dn); |
665 | if (!loader) |
666 | return; |
667 | |
668 | /* the loader must be align on a 16 byte boundary */ |
669 | isolated_loader = (char *)__get_free_pages(GFP_KERNEL, order: get_order(size)); |
670 | if (!isolated_loader) |
671 | return; |
672 | |
673 | isolated_loader_size = size; |
674 | memcpy(isolated_loader, loader, size); |
675 | printk(KERN_INFO "spufs: SPU isolation mode enabled\n" ); |
676 | } |
677 | |
678 | static int spufs_create_root(struct super_block *sb, struct fs_context *fc) |
679 | { |
680 | struct spufs_fs_context *ctx = fc->fs_private; |
681 | struct inode *inode; |
682 | |
683 | if (!spu_management_ops) |
684 | return -ENODEV; |
685 | |
686 | inode = spufs_new_inode(sb, S_IFDIR | ctx->mode); |
687 | if (!inode) |
688 | return -ENOMEM; |
689 | |
690 | inode->i_uid = ctx->uid; |
691 | inode->i_gid = ctx->gid; |
692 | inode->i_op = &simple_dir_inode_operations; |
693 | inode->i_fop = &simple_dir_operations; |
694 | SPUFS_I(inode)->i_ctx = NULL; |
695 | inc_nlink(inode); |
696 | |
697 | sb->s_root = d_make_root(inode); |
698 | if (!sb->s_root) |
699 | return -ENOMEM; |
700 | return 0; |
701 | } |
702 | |
703 | static const struct super_operations spufs_ops = { |
704 | .alloc_inode = spufs_alloc_inode, |
705 | .free_inode = spufs_free_inode, |
706 | .statfs = simple_statfs, |
707 | .evict_inode = spufs_evict_inode, |
708 | .show_options = spufs_show_options, |
709 | }; |
710 | |
711 | static int spufs_fill_super(struct super_block *sb, struct fs_context *fc) |
712 | { |
713 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
714 | sb->s_blocksize = PAGE_SIZE; |
715 | sb->s_blocksize_bits = PAGE_SHIFT; |
716 | sb->s_magic = SPUFS_MAGIC; |
717 | sb->s_op = &spufs_ops; |
718 | |
719 | return spufs_create_root(sb, fc); |
720 | } |
721 | |
722 | static int spufs_get_tree(struct fs_context *fc) |
723 | { |
724 | return get_tree_single(fc, fill_super: spufs_fill_super); |
725 | } |
726 | |
727 | static void spufs_free_fc(struct fs_context *fc) |
728 | { |
729 | kfree(objp: fc->s_fs_info); |
730 | } |
731 | |
732 | static const struct fs_context_operations spufs_context_ops = { |
733 | .free = spufs_free_fc, |
734 | .parse_param = spufs_parse_param, |
735 | .get_tree = spufs_get_tree, |
736 | }; |
737 | |
738 | static int spufs_init_fs_context(struct fs_context *fc) |
739 | { |
740 | struct spufs_fs_context *ctx; |
741 | struct spufs_sb_info *sbi; |
742 | |
743 | ctx = kzalloc(size: sizeof(struct spufs_fs_context), GFP_KERNEL); |
744 | if (!ctx) |
745 | goto nomem; |
746 | |
747 | sbi = kzalloc(size: sizeof(struct spufs_sb_info), GFP_KERNEL); |
748 | if (!sbi) |
749 | goto nomem_ctx; |
750 | |
751 | ctx->uid = current_uid(); |
752 | ctx->gid = current_gid(); |
753 | ctx->mode = 0755; |
754 | |
755 | fc->fs_private = ctx; |
756 | fc->s_fs_info = sbi; |
757 | fc->ops = &spufs_context_ops; |
758 | return 0; |
759 | |
760 | nomem_ctx: |
761 | kfree(objp: ctx); |
762 | nomem: |
763 | return -ENOMEM; |
764 | } |
765 | |
766 | static struct file_system_type spufs_type = { |
767 | .owner = THIS_MODULE, |
768 | .name = "spufs" , |
769 | .init_fs_context = spufs_init_fs_context, |
770 | .parameters = spufs_fs_parameters, |
771 | .kill_sb = kill_litter_super, |
772 | }; |
773 | MODULE_ALIAS_FS("spufs" ); |
774 | |
775 | static int __init spufs_init(void) |
776 | { |
777 | int ret; |
778 | |
779 | ret = -ENODEV; |
780 | if (!spu_management_ops) |
781 | goto out; |
782 | |
783 | ret = -ENOMEM; |
784 | spufs_inode_cache = kmem_cache_create(name: "spufs_inode_cache" , |
785 | size: sizeof(struct spufs_inode_info), align: 0, |
786 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, ctor: spufs_init_once); |
787 | |
788 | if (!spufs_inode_cache) |
789 | goto out; |
790 | ret = spu_sched_init(); |
791 | if (ret) |
792 | goto out_cache; |
793 | ret = register_spu_syscalls(&spufs_calls); |
794 | if (ret) |
795 | goto out_sched; |
796 | ret = register_filesystem(&spufs_type); |
797 | if (ret) |
798 | goto out_syscalls; |
799 | |
800 | spufs_init_isolated_loader(); |
801 | |
802 | return 0; |
803 | |
804 | out_syscalls: |
805 | unregister_spu_syscalls(&spufs_calls); |
806 | out_sched: |
807 | spu_sched_exit(); |
808 | out_cache: |
809 | kmem_cache_destroy(s: spufs_inode_cache); |
810 | out: |
811 | return ret; |
812 | } |
813 | module_init(spufs_init); |
814 | |
815 | static void __exit spufs_exit(void) |
816 | { |
817 | spu_sched_exit(); |
818 | spufs_exit_isolated_loader(); |
819 | unregister_spu_syscalls(&spufs_calls); |
820 | unregister_filesystem(&spufs_type); |
821 | kmem_cache_destroy(s: spufs_inode_cache); |
822 | } |
823 | module_exit(spufs_exit); |
824 | |
825 | MODULE_LICENSE("GPL" ); |
826 | MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>" ); |
827 | |
828 | |