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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | /* * 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 <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 file *neighbor; int fput_needed; struct spufs_calls *calls; calls = spufs_calls_get(); if (!calls) return -ENOSYS; if (flags & SPU_CREATE_AFFINITY_SPU) { ret = -EBADF; neighbor = fget_light(neighbor_fd, &fput_needed); if (neighbor) { ret = calls->create_thread(name, flags, mode, neighbor); fput_light(neighbor, fput_needed); } } 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 file *filp; int fput_needed; struct spufs_calls *calls; calls = spufs_calls_get(); if (!calls) return -ENOSYS; ret = -EBADF; filp = fget_light(fd, &fput_needed); if (filp) { ret = calls->spu_run(filp, unpc, ustatus); fput_light(filp, fput_needed); } spufs_calls_put(calls); return ret; } 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 file *file, loff_t *foffset) { struct spufs_calls *calls; int ret; calls = spufs_calls_get(); if (!calls) return 0; ret = calls->coredump_extra_notes_write(file, foffset); spufs_calls_put(calls); return ret; } 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_assign_pointer(spufs_calls, NULL); synchronize_rcu(); } EXPORT_SYMBOL_GPL(unregister_spu_syscalls); |