| /* |
| * SPU file system -- system call stubs |
| * |
| * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
| * (C) Copyright 2006-2007, IBM Corporation |
| * |
| * Author: Arnd Bergmann <arndb@de.ibm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| #include <linux/file.h> |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/syscalls.h> |
| #include <linux/rcupdate.h> |
| |
| #include <asm/spu.h> |
| |
| /* protected by rcu */ |
| static struct spufs_calls *spufs_calls; |
| |
| #ifdef CONFIG_SPU_FS_MODULE |
| |
| static inline struct spufs_calls *spufs_calls_get(void) |
| { |
| struct spufs_calls *calls = NULL; |
| |
| rcu_read_lock(); |
| calls = rcu_dereference(spufs_calls); |
| if (calls && !try_module_get(calls->owner)) |
| calls = NULL; |
| rcu_read_unlock(); |
| |
| return calls; |
| } |
| |
| static inline void spufs_calls_put(struct spufs_calls *calls) |
| { |
| BUG_ON(calls != spufs_calls); |
| |
| /* we don't need to rcu this, as we hold a reference to the module */ |
| module_put(spufs_calls->owner); |
| } |
| |
| #else /* !defined CONFIG_SPU_FS_MODULE */ |
| |
| static inline struct spufs_calls *spufs_calls_get(void) |
| { |
| return spufs_calls; |
| } |
| |
| static inline void spufs_calls_put(struct spufs_calls *calls) { } |
| |
| #endif /* CONFIG_SPU_FS_MODULE */ |
| |
| asmlinkage long sys_spu_create(const char __user *name, |
| unsigned int flags, mode_t mode, int neighbor_fd) |
| { |
| long ret; |
| struct file *neighbor; |
| int fput_needed; |
| struct spufs_calls *calls; |
| |
| calls = spufs_calls_get(); |
| if (!calls) |
| return -ENOSYS; |
| |
| if (flags & SPU_CREATE_AFFINITY_SPU) { |
| ret = -EBADF; |
| neighbor = fget_light(neighbor_fd, &fput_needed); |
| if (neighbor) { |
| ret = calls->create_thread(name, flags, mode, neighbor); |
| fput_light(neighbor, fput_needed); |
| } |
| } else |
| ret = calls->create_thread(name, flags, mode, NULL); |
| |
| spufs_calls_put(calls); |
| return ret; |
| } |
| |
| asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus) |
| { |
| long ret; |
| struct file *filp; |
| int fput_needed; |
| struct spufs_calls *calls; |
| |
| calls = spufs_calls_get(); |
| if (!calls) |
| return -ENOSYS; |
| |
| ret = -EBADF; |
| filp = fget_light(fd, &fput_needed); |
| if (filp) { |
| ret = calls->spu_run(filp, unpc, ustatus); |
| fput_light(filp, fput_needed); |
| } |
| |
| spufs_calls_put(calls); |
| return ret; |
| } |
| |
| int elf_coredump_extra_notes_size(void) |
| { |
| struct spufs_calls *calls; |
| int ret; |
| |
| calls = spufs_calls_get(); |
| if (!calls) |
| return 0; |
| |
| ret = calls->coredump_extra_notes_size(); |
| |
| spufs_calls_put(calls); |
| |
| return ret; |
| } |
| |
| int elf_coredump_extra_notes_write(struct file *file, loff_t *foffset) |
| { |
| struct spufs_calls *calls; |
| |
| calls = spufs_calls_get(); |
| if (!calls) |
| return 0; |
| |
| calls->coredump_extra_notes_write(file); |
| |
| spufs_calls_put(calls); |
| |
| /* Fudge foffset for now */ |
| *foffset = file->f_pos; |
| |
| return 0; |
| } |
| |
| int register_spu_syscalls(struct spufs_calls *calls) |
| { |
| if (spufs_calls) |
| return -EBUSY; |
| |
| rcu_assign_pointer(spufs_calls, calls); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(register_spu_syscalls); |
| |
| void unregister_spu_syscalls(struct spufs_calls *calls) |
| { |
| BUG_ON(spufs_calls->owner != calls->owner); |
| rcu_assign_pointer(spufs_calls, NULL); |
| synchronize_rcu(); |
| } |
| EXPORT_SYMBOL_GPL(unregister_spu_syscalls); |