2 * SPU file system -- system call stubs
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
5 * (C) Copyright 2006-2007, IBM Corporation
7 * Author: Arnd Bergmann <arndb@de.ibm.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/file.h>
25 #include <linux/module.h>
26 #include <linux/syscalls.h>
27 #include <linux/rcupdate.h>
28 #include <linux/binfmts.h>
29 #include <linux/syscalls.h>
33 /* protected by rcu */
34 static struct spufs_calls *spufs_calls;
36 #ifdef CONFIG_SPU_FS_MODULE
38 static inline struct spufs_calls *spufs_calls_get(void)
40 struct spufs_calls *calls = NULL;
43 calls = rcu_dereference(spufs_calls);
44 if (calls && !try_module_get(calls->owner))
51 static inline void spufs_calls_put(struct spufs_calls *calls)
53 BUG_ON(calls != spufs_calls);
55 /* we don't need to rcu this, as we hold a reference to the module */
56 module_put(spufs_calls->owner);
59 #else /* !defined CONFIG_SPU_FS_MODULE */
61 static inline struct spufs_calls *spufs_calls_get(void)
66 static inline void spufs_calls_put(struct spufs_calls *calls) { }
68 #endif /* CONFIG_SPU_FS_MODULE */
70 SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
71 umode_t, mode, int, neighbor_fd)
74 struct spufs_calls *calls;
76 calls = spufs_calls_get();
80 if (flags & SPU_CREATE_AFFINITY_SPU) {
81 struct fd neighbor = fdget(neighbor_fd);
84 ret = calls->create_thread(name, flags, mode, neighbor.file);
88 ret = calls->create_thread(name, flags, mode, NULL);
90 spufs_calls_put(calls);
94 SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
98 struct spufs_calls *calls;
100 calls = spufs_calls_get();
107 ret = calls->spu_run(arg.file, unpc, ustatus);
111 spufs_calls_put(calls);
115 #ifdef CONFIG_COREDUMP
116 int elf_coredump_extra_notes_size(void)
118 struct spufs_calls *calls;
121 calls = spufs_calls_get();
125 ret = calls->coredump_extra_notes_size();
127 spufs_calls_put(calls);
132 int elf_coredump_extra_notes_write(struct coredump_params *cprm)
134 struct spufs_calls *calls;
137 calls = spufs_calls_get();
141 ret = calls->coredump_extra_notes_write(cprm);
143 spufs_calls_put(calls);
149 void notify_spus_active(void)
151 struct spufs_calls *calls;
153 calls = spufs_calls_get();
157 calls->notify_spus_active();
158 spufs_calls_put(calls);
163 int register_spu_syscalls(struct spufs_calls *calls)
168 rcu_assign_pointer(spufs_calls, calls);
171 EXPORT_SYMBOL_GPL(register_spu_syscalls);
173 void unregister_spu_syscalls(struct spufs_calls *calls)
175 BUG_ON(spufs_calls->owner != calls->owner);
176 RCU_INIT_POINTER(spufs_calls, NULL);
179 EXPORT_SYMBOL_GPL(unregister_spu_syscalls);