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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 77 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.837555891@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
165 lines
3.1 KiB
C
165 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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