166 lines
3.1 KiB
C
166 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SPU file system -- system call stubs
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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* (C) Copyright 2006-2007, IBM Corporation
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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*/
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/syscalls.h>
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#include <linux/rcupdate.h>
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#include <linux/binfmts.h>
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#include <asm/spu.h>
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/* protected by rcu */
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static struct spufs_calls *spufs_calls;
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#ifdef CONFIG_SPU_FS_MODULE
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static inline struct spufs_calls *spufs_calls_get(void)
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{
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struct spufs_calls *calls = NULL;
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rcu_read_lock();
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calls = rcu_dereference(spufs_calls);
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if (calls && !try_module_get(calls->owner))
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calls = NULL;
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rcu_read_unlock();
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return calls;
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}
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static inline void spufs_calls_put(struct spufs_calls *calls)
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{
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BUG_ON(calls != spufs_calls);
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/* we don't need to rcu this, as we hold a reference to the module */
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module_put(spufs_calls->owner);
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}
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#else /* !defined CONFIG_SPU_FS_MODULE */
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static inline struct spufs_calls *spufs_calls_get(void)
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{
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return spufs_calls;
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}
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static inline void spufs_calls_put(struct spufs_calls *calls) { }
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#endif /* CONFIG_SPU_FS_MODULE */
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SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
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umode_t, mode, int, neighbor_fd)
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{
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long ret;
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struct spufs_calls *calls;
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calls = spufs_calls_get();
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if (!calls)
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return -ENOSYS;
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if (flags & SPU_CREATE_AFFINITY_SPU) {
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struct fd neighbor = fdget(neighbor_fd);
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ret = -EBADF;
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if (neighbor.file) {
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ret = calls->create_thread(name, flags, mode, neighbor.file);
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fdput(neighbor);
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}
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} else
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ret = calls->create_thread(name, flags, mode, NULL);
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spufs_calls_put(calls);
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return ret;
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}
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SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
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{
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long ret;
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struct fd arg;
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struct spufs_calls *calls;
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calls = spufs_calls_get();
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if (!calls)
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return -ENOSYS;
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ret = -EBADF;
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arg = fdget(fd);
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if (arg.file) {
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ret = calls->spu_run(arg.file, unpc, ustatus);
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fdput(arg);
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}
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spufs_calls_put(calls);
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return ret;
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}
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#ifdef CONFIG_COREDUMP
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int elf_coredump_extra_notes_size(void)
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{
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struct spufs_calls *calls;
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int ret;
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calls = spufs_calls_get();
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if (!calls)
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return 0;
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ret = calls->coredump_extra_notes_size();
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spufs_calls_put(calls);
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return ret;
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}
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int elf_coredump_extra_notes_write(struct coredump_params *cprm)
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{
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struct spufs_calls *calls;
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int ret;
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calls = spufs_calls_get();
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if (!calls)
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return 0;
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ret = calls->coredump_extra_notes_write(cprm);
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spufs_calls_put(calls);
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return ret;
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}
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#endif
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void notify_spus_active(void)
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{
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struct spufs_calls *calls;
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calls = spufs_calls_get();
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if (!calls)
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return;
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calls->notify_spus_active();
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spufs_calls_put(calls);
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return;
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}
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int register_spu_syscalls(struct spufs_calls *calls)
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{
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if (spufs_calls)
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return -EBUSY;
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rcu_assign_pointer(spufs_calls, calls);
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return 0;
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}
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EXPORT_SYMBOL_GPL(register_spu_syscalls);
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void unregister_spu_syscalls(struct spufs_calls *calls)
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{
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BUG_ON(spufs_calls->owner != calls->owner);
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RCU_INIT_POINTER(spufs_calls, NULL);
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synchronize_rcu();
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}
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EXPORT_SYMBOL_GPL(unregister_spu_syscalls);
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