1de6cc651SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
267207b96SArnd Bergmann /*
367207b96SArnd Bergmann * SPU file system -- system call stubs
467207b96SArnd Bergmann *
567207b96SArnd Bergmann * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
648cad41fSMichael Ellerman * (C) Copyright 2006-2007, IBM Corporation
767207b96SArnd Bergmann *
867207b96SArnd Bergmann * Author: Arnd Bergmann <arndb@de.ibm.com>
967207b96SArnd Bergmann */
1067207b96SArnd Bergmann #include <linux/file.h>
11e5501492SMichael Ellerman #include <linux/fs.h>
1267207b96SArnd Bergmann #include <linux/module.h>
1367207b96SArnd Bergmann #include <linux/syscalls.h>
1498f06978SJeremy Kerr #include <linux/rcupdate.h>
15cdc3d562SAl Viro #include <linux/binfmts.h>
1667207b96SArnd Bergmann
1767207b96SArnd Bergmann #include <asm/spu.h>
1867207b96SArnd Bergmann
1998f06978SJeremy Kerr /* protected by rcu */
2098f06978SJeremy Kerr static struct spufs_calls *spufs_calls;
2167207b96SArnd Bergmann
2298f06978SJeremy Kerr #ifdef CONFIG_SPU_FS_MODULE
2398f06978SJeremy Kerr
spufs_calls_get(void)2498f06978SJeremy Kerr static inline struct spufs_calls *spufs_calls_get(void)
2598f06978SJeremy Kerr {
2698f06978SJeremy Kerr struct spufs_calls *calls = NULL;
2798f06978SJeremy Kerr
2898f06978SJeremy Kerr rcu_read_lock();
2998f06978SJeremy Kerr calls = rcu_dereference(spufs_calls);
3098f06978SJeremy Kerr if (calls && !try_module_get(calls->owner))
3198f06978SJeremy Kerr calls = NULL;
3298f06978SJeremy Kerr rcu_read_unlock();
3398f06978SJeremy Kerr
3498f06978SJeremy Kerr return calls;
3598f06978SJeremy Kerr }
3698f06978SJeremy Kerr
spufs_calls_put(struct spufs_calls * calls)3798f06978SJeremy Kerr static inline void spufs_calls_put(struct spufs_calls *calls)
3898f06978SJeremy Kerr {
3998f06978SJeremy Kerr BUG_ON(calls != spufs_calls);
4098f06978SJeremy Kerr
4198f06978SJeremy Kerr /* we don't need to rcu this, as we hold a reference to the module */
4298f06978SJeremy Kerr module_put(spufs_calls->owner);
4398f06978SJeremy Kerr }
4498f06978SJeremy Kerr
4598f06978SJeremy Kerr #else /* !defined CONFIG_SPU_FS_MODULE */
4698f06978SJeremy Kerr
spufs_calls_get(void)4798f06978SJeremy Kerr static inline struct spufs_calls *spufs_calls_get(void)
4898f06978SJeremy Kerr {
4998f06978SJeremy Kerr return spufs_calls;
5098f06978SJeremy Kerr }
5198f06978SJeremy Kerr
spufs_calls_put(struct spufs_calls * calls)5298f06978SJeremy Kerr static inline void spufs_calls_put(struct spufs_calls *calls) { }
5398f06978SJeremy Kerr
5498f06978SJeremy Kerr #endif /* CONFIG_SPU_FS_MODULE */
5567207b96SArnd Bergmann
SYSCALL_DEFINE4(spu_create,const char __user *,name,unsigned int,flags,umode_t,mode,int,neighbor_fd)561bc94226SAl Viro SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
571bc94226SAl Viro umode_t, mode, int, neighbor_fd)
5867207b96SArnd Bergmann {
5967207b96SArnd Bergmann long ret;
6098f06978SJeremy Kerr struct spufs_calls *calls;
6167207b96SArnd Bergmann
6298f06978SJeremy Kerr calls = spufs_calls_get();
6398f06978SJeremy Kerr if (!calls)
6498f06978SJeremy Kerr return -ENOSYS;
6598f06978SJeremy Kerr
668e68e2f2SArnd Bergmann if (flags & SPU_CREATE_AFFINITY_SPU) {
672903ff01SAl Viro struct fd neighbor = fdget(neighbor_fd);
68ad941fe4SJeremy Kerr ret = -EBADF;
692903ff01SAl Viro if (neighbor.file) {
702903ff01SAl Viro ret = calls->create_thread(name, flags, mode, neighbor.file);
712903ff01SAl Viro fdput(neighbor);
728e68e2f2SArnd Bergmann }
7398f06978SJeremy Kerr } else
7498f06978SJeremy Kerr ret = calls->create_thread(name, flags, mode, NULL);
7598f06978SJeremy Kerr
7698f06978SJeremy Kerr spufs_calls_put(calls);
7767207b96SArnd Bergmann return ret;
7867207b96SArnd Bergmann }
7967207b96SArnd Bergmann
SYSCALL_DEFINE3(spu_run,int,fd,__u32 __user *,unpc,__u32 __user *,ustatus)803691d614SAl Viro SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
8167207b96SArnd Bergmann {
8267207b96SArnd Bergmann long ret;
832903ff01SAl Viro struct fd arg;
8498f06978SJeremy Kerr struct spufs_calls *calls;
8567207b96SArnd Bergmann
8698f06978SJeremy Kerr calls = spufs_calls_get();
8798f06978SJeremy Kerr if (!calls)
8898f06978SJeremy Kerr return -ENOSYS;
8998f06978SJeremy Kerr
9067207b96SArnd Bergmann ret = -EBADF;
912903ff01SAl Viro arg = fdget(fd);
922903ff01SAl Viro if (arg.file) {
932903ff01SAl Viro ret = calls->spu_run(arg.file, unpc, ustatus);
942903ff01SAl Viro fdput(arg);
9567207b96SArnd Bergmann }
9698f06978SJeremy Kerr
9798f06978SJeremy Kerr spufs_calls_put(calls);
9867207b96SArnd Bergmann return ret;
9967207b96SArnd Bergmann }
10067207b96SArnd Bergmann
101e623fbf1SMichael Ellerman #ifdef CONFIG_COREDUMP
elf_coredump_extra_notes_size(void)102e5501492SMichael Ellerman int elf_coredump_extra_notes_size(void)
10348cad41fSMichael Ellerman {
10448cad41fSMichael Ellerman struct spufs_calls *calls;
10548cad41fSMichael Ellerman int ret;
10648cad41fSMichael Ellerman
10748cad41fSMichael Ellerman calls = spufs_calls_get();
10848cad41fSMichael Ellerman if (!calls)
10948cad41fSMichael Ellerman return 0;
11048cad41fSMichael Ellerman
11148cad41fSMichael Ellerman ret = calls->coredump_extra_notes_size();
11248cad41fSMichael Ellerman
11348cad41fSMichael Ellerman spufs_calls_put(calls);
11448cad41fSMichael Ellerman
11548cad41fSMichael Ellerman return ret;
11648cad41fSMichael Ellerman }
11748cad41fSMichael Ellerman
elf_coredump_extra_notes_write(struct coredump_params * cprm)118cdc3d562SAl Viro int elf_coredump_extra_notes_write(struct coredump_params *cprm)
11948cad41fSMichael Ellerman {
12048cad41fSMichael Ellerman struct spufs_calls *calls;
1217af1443aSMichael Ellerman int ret;
12248cad41fSMichael Ellerman
12348cad41fSMichael Ellerman calls = spufs_calls_get();
12448cad41fSMichael Ellerman if (!calls)
125e5501492SMichael Ellerman return 0;
12648cad41fSMichael Ellerman
127cdc3d562SAl Viro ret = calls->coredump_extra_notes_write(cprm);
12848cad41fSMichael Ellerman
12948cad41fSMichael Ellerman spufs_calls_put(calls);
130e5501492SMichael Ellerman
1317af1443aSMichael Ellerman return ret;
13248cad41fSMichael Ellerman }
133e623fbf1SMichael Ellerman #endif
13448cad41fSMichael Ellerman
notify_spus_active(void)135aed3a8c9SBob Nelson void notify_spus_active(void)
136aed3a8c9SBob Nelson {
137aed3a8c9SBob Nelson struct spufs_calls *calls;
138aed3a8c9SBob Nelson
139aed3a8c9SBob Nelson calls = spufs_calls_get();
140aed3a8c9SBob Nelson if (!calls)
141aed3a8c9SBob Nelson return;
142aed3a8c9SBob Nelson
143aed3a8c9SBob Nelson calls->notify_spus_active();
144aed3a8c9SBob Nelson spufs_calls_put(calls);
145aed3a8c9SBob Nelson
146aed3a8c9SBob Nelson return;
147aed3a8c9SBob Nelson }
148aed3a8c9SBob Nelson
register_spu_syscalls(struct spufs_calls * calls)14967207b96SArnd Bergmann int register_spu_syscalls(struct spufs_calls *calls)
15067207b96SArnd Bergmann {
15198f06978SJeremy Kerr if (spufs_calls)
15267207b96SArnd Bergmann return -EBUSY;
15367207b96SArnd Bergmann
15498f06978SJeremy Kerr rcu_assign_pointer(spufs_calls, calls);
15567207b96SArnd Bergmann return 0;
15667207b96SArnd Bergmann }
15767207b96SArnd Bergmann EXPORT_SYMBOL_GPL(register_spu_syscalls);
15867207b96SArnd Bergmann
unregister_spu_syscalls(struct spufs_calls * calls)15967207b96SArnd Bergmann void unregister_spu_syscalls(struct spufs_calls *calls)
16067207b96SArnd Bergmann {
16198f06978SJeremy Kerr BUG_ON(spufs_calls->owner != calls->owner);
162282efb70SMonam Agarwal RCU_INIT_POINTER(spufs_calls, NULL);
16398f06978SJeremy Kerr synchronize_rcu();
16467207b96SArnd Bergmann }
16567207b96SArnd Bergmann EXPORT_SYMBOL_GPL(unregister_spu_syscalls);
166