spu_syscalls.c
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/*
* 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 <linux/binfmts.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 */
SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
umode_t, mode, int, neighbor_fd)
{
long ret;
struct spufs_calls *calls;
calls = spufs_calls_get();
if (!calls)
return -ENOSYS;
if (flags & SPU_CREATE_AFFINITY_SPU) {
struct fd neighbor = fdget(neighbor_fd);
ret = -EBADF;
if (neighbor.file) {
ret = calls->create_thread(name, flags, mode, neighbor.file);
fdput(neighbor);
}
} 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 fd arg;
struct spufs_calls *calls;
calls = spufs_calls_get();
if (!calls)
return -ENOSYS;
ret = -EBADF;
arg = fdget(fd);
if (arg.file) {
ret = calls->spu_run(arg.file, unpc, ustatus);
fdput(arg);
}
spufs_calls_put(calls);
return ret;
}
#ifdef CONFIG_COREDUMP
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 coredump_params *cprm)
{
struct spufs_calls *calls;
int ret;
calls = spufs_calls_get();
if (!calls)
return 0;
ret = calls->coredump_extra_notes_write(cprm);
spufs_calls_put(calls);
return ret;
}
#endif
void notify_spus_active(void)
{
struct spufs_calls *calls;
calls = spufs_calls_get();
if (!calls)
return;
calls->notify_spus_active();
spufs_calls_put(calls);
return;
}
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_INIT_POINTER(spufs_calls, NULL);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(unregister_spu_syscalls);