1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
8 * Author: Arnd Bergmann <arndb@de.ibm.com>
11 #include <linux/file.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>
25 #include <linux/seq_file.h>
26 #include <linux/slab.h>
29 #include <asm/spu_priv1.h>
30 #include <linux/uaccess.h>
34 struct spufs_sb_info {
38 static struct kmem_cache *spufs_inode_cache;
39 char *isolated_loader;
40 static int isolated_loader_size;
42 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
48 spufs_alloc_inode(struct super_block *sb)
50 struct spufs_inode_info *ei;
52 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
60 return &ei->vfs_inode;
63 static void spufs_free_inode(struct inode *inode)
65 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
69 spufs_init_once(void *p)
71 struct spufs_inode_info *ei = p;
73 inode_init_once(&ei->vfs_inode);
77 spufs_new_inode(struct super_block *sb, umode_t mode)
81 inode = new_inode(sb);
85 inode->i_ino = get_next_ino();
87 inode->i_uid = current_fsuid();
88 inode->i_gid = current_fsgid();
89 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
95 spufs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
98 struct inode *inode = d_inode(dentry);
100 if ((attr->ia_valid & ATTR_SIZE) &&
101 (attr->ia_size != inode->i_size))
103 setattr_copy(&nop_mnt_idmap, inode, attr);
104 mark_inode_dirty(inode);
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)
114 static const struct inode_operations spufs_file_iops = {
115 .setattr = spufs_setattr,
121 inode = spufs_new_inode(sb, S_IFREG | mode);
126 inode->i_op = &spufs_file_iops;
128 inode->i_size = size;
129 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
130 d_add(dentry, inode);
136 spufs_evict_inode(struct inode *inode)
138 struct spufs_inode_info *ei = SPUFS_I(inode);
141 put_spu_context(ei->i_ctx);
143 put_spu_gang(ei->i_gang);
146 static void spufs_prune_dir(struct dentry *dir)
148 struct dentry *dentry, *tmp;
150 inode_lock(d_inode(dir));
151 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
152 spin_lock(&dentry->d_lock);
153 if (simple_positive(dentry)) {
156 spin_unlock(&dentry->d_lock);
157 simple_unlink(d_inode(dir), dentry);
158 /* XXX: what was dcache_lock protecting here? Other
159 * filesystems (IB, configfs) release dcache_lock
163 spin_unlock(&dentry->d_lock);
166 shrink_dcache_parent(dir);
167 inode_unlock(d_inode(dir));
170 /* Caller must hold parent->i_mutex */
171 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
173 /* remove all entries */
175 spufs_prune_dir(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);
183 static int spufs_fill_dir(struct dentry *dir,
184 const struct spufs_tree_descr *files, umode_t mode,
185 struct spu_context *ctx)
187 while (files->name && files->name[0]) {
189 struct dentry *dentry = d_alloc_name(dir, files->name);
192 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
193 files->mode & mode, files->size, ctx);
201 static int spufs_dir_close(struct inode *inode, struct file *file)
203 struct inode *parent;
207 dir = file->f_path.dentry;
208 parent = d_inode(dir->d_parent);
210 inode_lock_nested(parent, I_MUTEX_PARENT);
211 ret = spufs_rmdir(parent, dir);
212 inode_unlock(parent);
215 return dcache_dir_close(inode, file);
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,
226 EXPORT_SYMBOL_GPL(spufs_context_fops);
229 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
234 struct spu_context *ctx;
236 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
240 inode_init_owner(&init_user_ns, inode, dir, mode | S_IFDIR);
241 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
242 SPUFS_I(inode)->i_ctx = ctx;
249 inode->i_op = &simple_dir_inode_operations;
250 inode->i_fop = &simple_dir_operations;
258 d_instantiate(dentry, inode);
260 if (flags & SPU_CREATE_NOSCHED)
261 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
264 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
266 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
267 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
271 spufs_rmdir(dir, dentry);
278 static int spufs_context_open(const struct path *path)
283 ret = get_unused_fd_flags(0);
287 filp = dentry_open(path, O_RDONLY, current_cred());
290 return PTR_ERR(filp);
293 filp->f_op = &spufs_context_fops;
294 fd_install(ret, filp);
298 static struct spu_context *
299 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
302 struct spu_context *tmp, *neighbor, *err;
306 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
307 struct spu, cbe_list))->aff_list);
310 return ERR_PTR(-EINVAL);
312 if (flags & SPU_CREATE_GANG)
313 return ERR_PTR(-EINVAL);
315 if (flags & SPU_CREATE_AFFINITY_MEM &&
317 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
318 return ERR_PTR(-EEXIST);
320 if (gang->aff_flags & AFF_MERGED)
321 return ERR_PTR(-EBUSY);
324 if (flags & SPU_CREATE_AFFINITY_SPU) {
325 if (!filp || filp->f_op != &spufs_context_fops)
326 return ERR_PTR(-EINVAL);
328 neighbor = get_spu_context(
329 SPUFS_I(file_inode(filp))->i_ctx);
331 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
332 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
333 !list_entry(neighbor->aff_list.next, struct spu_context,
334 aff_list)->aff_head) {
335 err = ERR_PTR(-EEXIST);
336 goto out_put_neighbor;
339 if (gang != neighbor->gang) {
340 err = ERR_PTR(-EINVAL);
341 goto out_put_neighbor;
345 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
347 if (list_empty(&neighbor->aff_list))
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)
356 if (node == MAX_NUMNODES) {
357 err = ERR_PTR(-EEXIST);
358 goto out_put_neighbor;
365 put_spu_context(neighbor);
370 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
371 struct spu_context *neighbor)
373 if (flags & SPU_CREATE_AFFINITY_MEM)
374 ctx->gang->aff_ref_ctx = ctx;
376 if (flags & SPU_CREATE_AFFINITY_SPU) {
377 if (list_empty(&neighbor->aff_list)) {
378 list_add_tail(&neighbor->aff_list,
379 &ctx->gang->aff_list_head);
380 neighbor->aff_head = 1;
383 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
384 || list_entry(neighbor->aff_list.next, struct spu_context,
385 aff_list)->aff_head) {
386 list_add(&ctx->aff_list, &neighbor->aff_list);
388 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
389 if (neighbor->aff_head) {
390 neighbor->aff_head = 0;
395 if (!ctx->gang->aff_ref_ctx)
396 ctx->gang->aff_ref_ctx = ctx;
401 spufs_create_context(struct inode *inode, struct dentry *dentry,
402 struct vfsmount *mnt, int flags, umode_t mode,
403 struct file *aff_filp)
407 struct spu_gang *gang;
408 struct spu_context *neighbor;
409 struct path path = {.mnt = mnt, .dentry = dentry};
411 if ((flags & SPU_CREATE_NOSCHED) &&
412 !capable(CAP_SYS_NICE))
415 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
416 == SPU_CREATE_ISOLATE)
419 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
424 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
426 gang = SPUFS_I(inode)->i_gang;
429 mutex_lock(&gang->aff_mutex);
430 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
431 if (IS_ERR(neighbor)) {
432 ret = PTR_ERR(neighbor);
437 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
442 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
445 put_spu_context(neighbor);
448 ret = spufs_context_open(&path);
450 WARN_ON(spufs_rmdir(inode, dentry));
454 mutex_unlock(&gang->aff_mutex);
459 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
463 struct spu_gang *gang;
466 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
471 inode_init_owner(&init_user_ns, inode, dir, mode | S_IFDIR);
472 gang = alloc_spu_gang();
473 SPUFS_I(inode)->i_ctx = NULL;
474 SPUFS_I(inode)->i_gang = gang;
480 inode->i_op = &simple_dir_inode_operations;
481 inode->i_fop = &simple_dir_operations;
483 d_instantiate(dentry, inode);
485 inc_nlink(d_inode(dentry));
494 static int spufs_gang_open(const struct path *path)
499 ret = get_unused_fd_flags(0);
504 * get references for dget and mntget, will be released
505 * in error path of *_open().
507 filp = dentry_open(path, O_RDONLY, current_cred());
510 return PTR_ERR(filp);
513 filp->f_op = &simple_dir_operations;
514 fd_install(ret, filp);
518 static int spufs_create_gang(struct inode *inode,
519 struct dentry *dentry,
520 struct vfsmount *mnt, umode_t mode)
522 struct path path = {.mnt = mnt, .dentry = dentry};
525 ret = spufs_mkgang(inode, dentry, mode & 0777);
527 ret = spufs_gang_open(&path);
529 int err = simple_rmdir(inode, dentry);
537 static struct file_system_type spufs_type;
539 long spufs_create(const struct path *path, struct dentry *dentry,
540 unsigned int flags, umode_t mode, struct file *filp)
542 struct inode *dir = d_inode(path->dentry);
545 /* check if we are on spufs */
546 if (path->dentry->d_sb->s_type != &spufs_type)
549 /* don't accept undefined flags */
550 if (flags & (~SPU_CREATE_FLAG_ALL))
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)
558 mode &= ~current_umask();
560 if (flags & SPU_CREATE_GANG)
561 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
563 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
566 fsnotify_mkdir(dir, dentry);
571 /* File system initialization */
572 struct spufs_fs_context {
579 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
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),
590 static int spufs_show_options(struct seq_file *m, struct dentry *root)
592 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
593 struct inode *inode = root->d_inode;
595 if (!uid_eq(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);
604 seq_puts(m, ",debug");
608 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
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;
617 opt = fs_parse(fc, spufs_fs_parameters, param, &result);
623 uid = make_kuid(current_user_ns(), result.uint_32);
625 return invalf(fc, "Unknown uid");
629 gid = make_kgid(current_user_ns(), result.uint_32);
631 return invalf(fc, "Unknown gid");
635 ctx->mode = result.uint_32 & S_IALLUGO;
645 static void spufs_exit_isolated_loader(void)
647 free_pages((unsigned long) isolated_loader,
648 get_order(isolated_loader_size));
652 spufs_init_isolated_loader(void)
654 struct device_node *dn;
658 dn = of_find_node_by_path("/spu-isolation");
662 loader = of_get_property(dn, "loader", &size);
667 /* the loader must be align on a 16 byte boundary */
668 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
669 if (!isolated_loader)
672 isolated_loader_size = size;
673 memcpy(isolated_loader, loader, size);
674 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
677 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
679 struct spufs_fs_context *ctx = fc->fs_private;
682 if (!spu_management_ops)
685 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
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;
696 sb->s_root = d_make_root(inode);
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,
710 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
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;
718 return spufs_create_root(sb, fc);
721 static int spufs_get_tree(struct fs_context *fc)
723 return get_tree_single(fc, spufs_fill_super);
726 static void spufs_free_fc(struct fs_context *fc)
728 kfree(fc->s_fs_info);
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,
737 static int spufs_init_fs_context(struct fs_context *fc)
739 struct spufs_fs_context *ctx;
740 struct spufs_sb_info *sbi;
742 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
746 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
750 ctx->uid = current_uid();
751 ctx->gid = current_gid();
754 fc->fs_private = ctx;
756 fc->ops = &spufs_context_ops;
765 static struct file_system_type spufs_type = {
766 .owner = THIS_MODULE,
768 .init_fs_context = spufs_init_fs_context,
769 .parameters = spufs_fs_parameters,
770 .kill_sb = kill_litter_super,
772 MODULE_ALIAS_FS("spufs");
774 static int __init spufs_init(void)
779 if (!spu_management_ops)
783 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
784 sizeof(struct spufs_inode_info), 0,
785 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
787 if (!spufs_inode_cache)
789 ret = spu_sched_init();
792 ret = register_spu_syscalls(&spufs_calls);
795 ret = register_filesystem(&spufs_type);
799 spufs_init_isolated_loader();
804 unregister_spu_syscalls(&spufs_calls);
808 kmem_cache_destroy(spufs_inode_cache);
812 module_init(spufs_init);
814 static void __exit spufs_exit(void)
817 spufs_exit_isolated_loader();
818 unregister_spu_syscalls(&spufs_calls);
819 unregister_filesystem(&spufs_type);
820 kmem_cache_destroy(spufs_inode_cache);
822 module_exit(spufs_exit);
824 MODULE_LICENSE("GPL");
825 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");