~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/cell/spu_syscalls.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * SPU file system -- system call stubs
  4  *
  5  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  6  * (C) Copyright 2006-2007, IBM Corporation
  7  *
  8  * Author: Arnd Bergmann <arndb@de.ibm.com>
  9  */
 10 #include <linux/file.h>
 11 #include <linux/fs.h>
 12 #include <linux/module.h>
 13 #include <linux/syscalls.h>
 14 #include <linux/rcupdate.h>
 15 #include <linux/binfmts.h>
 16 
 17 #include <asm/spu.h>
 18 
 19 /* protected by rcu */
 20 static struct spufs_calls *spufs_calls;
 21 
 22 #ifdef CONFIG_SPU_FS_MODULE
 23 
 24 static inline struct spufs_calls *spufs_calls_get(void)
 25 {
 26         struct spufs_calls *calls = NULL;
 27 
 28         rcu_read_lock();
 29         calls = rcu_dereference(spufs_calls);
 30         if (calls && !try_module_get(calls->owner))
 31                 calls = NULL;
 32         rcu_read_unlock();
 33 
 34         return calls;
 35 }
 36 
 37 static inline void spufs_calls_put(struct spufs_calls *calls)
 38 {
 39         BUG_ON(calls != spufs_calls);
 40 
 41         /* we don't need to rcu this, as we hold a reference to the module */
 42         module_put(spufs_calls->owner);
 43 }
 44 
 45 #else /* !defined CONFIG_SPU_FS_MODULE */
 46 
 47 static inline struct spufs_calls *spufs_calls_get(void)
 48 {
 49         return spufs_calls;
 50 }
 51 
 52 static inline void spufs_calls_put(struct spufs_calls *calls) { }
 53 
 54 #endif /* CONFIG_SPU_FS_MODULE */
 55 
 56 SYSCALL_DEFINE4(spu_create, const char __user *, name, unsigned int, flags,
 57         umode_t, mode, int, neighbor_fd)
 58 {
 59         long ret;
 60         struct spufs_calls *calls;
 61 
 62         calls = spufs_calls_get();
 63         if (!calls)
 64                 return -ENOSYS;
 65 
 66         if (flags & SPU_CREATE_AFFINITY_SPU) {
 67                 struct fd neighbor = fdget(neighbor_fd);
 68                 ret = -EBADF;
 69                 if (neighbor.file) {
 70                         ret = calls->create_thread(name, flags, mode, neighbor.file);
 71                         fdput(neighbor);
 72                 }
 73         } else
 74                 ret = calls->create_thread(name, flags, mode, NULL);
 75 
 76         spufs_calls_put(calls);
 77         return ret;
 78 }
 79 
 80 SYSCALL_DEFINE3(spu_run,int, fd, __u32 __user *, unpc, __u32 __user *, ustatus)
 81 {
 82         long ret;
 83         struct fd arg;
 84         struct spufs_calls *calls;
 85 
 86         calls = spufs_calls_get();
 87         if (!calls)
 88                 return -ENOSYS;
 89 
 90         ret = -EBADF;
 91         arg = fdget(fd);
 92         if (arg.file) {
 93                 ret = calls->spu_run(arg.file, unpc, ustatus);
 94                 fdput(arg);
 95         }
 96 
 97         spufs_calls_put(calls);
 98         return ret;
 99 }
100 
101 #ifdef CONFIG_COREDUMP
102 int elf_coredump_extra_notes_size(void)
103 {
104         struct spufs_calls *calls;
105         int ret;
106 
107         calls = spufs_calls_get();
108         if (!calls)
109                 return 0;
110 
111         ret = calls->coredump_extra_notes_size();
112 
113         spufs_calls_put(calls);
114 
115         return ret;
116 }
117 
118 int elf_coredump_extra_notes_write(struct coredump_params *cprm)
119 {
120         struct spufs_calls *calls;
121         int ret;
122 
123         calls = spufs_calls_get();
124         if (!calls)
125                 return 0;
126 
127         ret = calls->coredump_extra_notes_write(cprm);
128 
129         spufs_calls_put(calls);
130 
131         return ret;
132 }
133 #endif
134 
135 void notify_spus_active(void)
136 {
137         struct spufs_calls *calls;
138 
139         calls = spufs_calls_get();
140         if (!calls)
141                 return;
142 
143         calls->notify_spus_active();
144         spufs_calls_put(calls);
145 
146         return;
147 }
148 
149 int register_spu_syscalls(struct spufs_calls *calls)
150 {
151         if (spufs_calls)
152                 return -EBUSY;
153 
154         rcu_assign_pointer(spufs_calls, calls);
155         return 0;
156 }
157 EXPORT_SYMBOL_GPL(register_spu_syscalls);
158 
159 void unregister_spu_syscalls(struct spufs_calls *calls)
160 {
161         BUG_ON(spufs_calls->owner != calls->owner);
162         RCU_INIT_POINTER(spufs_calls, NULL);
163         synchronize_rcu();
164 }
165 EXPORT_SYMBOL_GPL(unregister_spu_syscalls);
166 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp