1 /* 2 * SPU file system 3 * 4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 5 * 6 * Author: Arnd Bergmann <arndb@de.ibm.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2, or (at your option) 11 * any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 #ifndef SPUFS_H 23 #define SPUFS_H 24 25 #include <linux/kref.h> 26 #include <linux/rwsem.h> 27 #include <linux/spinlock.h> 28 #include <linux/fs.h> 29 30 #include <asm/spu.h> 31 #include <asm/spu_csa.h> 32 33 /* The magic number for our file system */ 34 enum { 35 SPUFS_MAGIC = 0x23c9b64e, 36 }; 37 38 struct spu_context_ops; 39 40 #define SPU_CONTEXT_PREEMPT 0UL 41 42 struct spu_context { 43 struct spu *spu; /* pointer to a physical SPU */ 44 struct spu_state csa; /* SPU context save area. */ 45 spinlock_t mmio_lock; /* protects mmio access */ 46 struct address_space *local_store;/* local store backing store */ 47 48 enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state; 49 struct rw_semaphore state_sema; 50 struct semaphore run_sema; 51 52 struct mm_struct *owner; 53 54 struct kref kref; 55 wait_queue_head_t ibox_wq; 56 wait_queue_head_t wbox_wq; 57 wait_queue_head_t stop_wq; 58 struct fasync_struct *ibox_fasync; 59 struct fasync_struct *wbox_fasync; 60 struct spu_context_ops *ops; 61 struct work_struct reap_work; 62 u64 flags; 63 }; 64 65 /* SPU context query/set operations. */ 66 struct spu_context_ops { 67 int (*mbox_read) (struct spu_context * ctx, u32 * data); 68 u32(*mbox_stat_read) (struct spu_context * ctx); 69 unsigned int (*mbox_stat_poll)(struct spu_context *ctx, 70 unsigned int events); 71 int (*ibox_read) (struct spu_context * ctx, u32 * data); 72 int (*wbox_write) (struct spu_context * ctx, u32 data); 73 u32(*signal1_read) (struct spu_context * ctx); 74 void (*signal1_write) (struct spu_context * ctx, u32 data); 75 u32(*signal2_read) (struct spu_context * ctx); 76 void (*signal2_write) (struct spu_context * ctx, u32 data); 77 void (*signal1_type_set) (struct spu_context * ctx, u64 val); 78 u64(*signal1_type_get) (struct spu_context * ctx); 79 void (*signal2_type_set) (struct spu_context * ctx, u64 val); 80 u64(*signal2_type_get) (struct spu_context * ctx); 81 u32(*npc_read) (struct spu_context * ctx); 82 void (*npc_write) (struct spu_context * ctx, u32 data); 83 u32(*status_read) (struct spu_context * ctx); 84 char*(*get_ls) (struct spu_context * ctx); 85 void (*runcntl_write) (struct spu_context * ctx, u32 data); 86 void (*runcntl_stop) (struct spu_context * ctx); 87 }; 88 89 extern struct spu_context_ops spu_hw_ops; 90 extern struct spu_context_ops spu_backing_ops; 91 92 struct spufs_inode_info { 93 struct spu_context *i_ctx; 94 struct inode vfs_inode; 95 }; 96 #define SPUFS_I(inode) \ 97 container_of(inode, struct spufs_inode_info, vfs_inode) 98 99 extern struct tree_descr spufs_dir_contents[]; 100 101 /* system call implementation */ 102 long spufs_run_spu(struct file *file, 103 struct spu_context *ctx, u32 *npc, u32 *status); 104 long spufs_create_thread(struct nameidata *nd, 105 unsigned int flags, mode_t mode); 106 extern struct file_operations spufs_context_fops; 107 108 /* context management */ 109 struct spu_context * alloc_spu_context(struct address_space *local_store); 110 void destroy_spu_context(struct kref *kref); 111 struct spu_context * get_spu_context(struct spu_context *ctx); 112 int put_spu_context(struct spu_context *ctx); 113 void spu_unmap_mappings(struct spu_context *ctx); 114 115 void spu_forget(struct spu_context *ctx); 116 void spu_acquire(struct spu_context *ctx); 117 void spu_release(struct spu_context *ctx); 118 int spu_acquire_runnable(struct spu_context *ctx); 119 void spu_acquire_saved(struct spu_context *ctx); 120 121 int spu_activate(struct spu_context *ctx, u64 flags); 122 void spu_deactivate(struct spu_context *ctx); 123 void spu_yield(struct spu_context *ctx); 124 int __init spu_sched_init(void); 125 void __exit spu_sched_exit(void); 126 127 /* 128 * spufs_wait 129 * Same as wait_event_interruptible(), except that here 130 * we need to call spu_release(ctx) before sleeping, and 131 * then spu_acquire(ctx) when awoken. 132 */ 133 134 #define spufs_wait(wq, condition) \ 135 ({ \ 136 int __ret = 0; \ 137 DEFINE_WAIT(__wait); \ 138 for (;;) { \ 139 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \ 140 if (condition) \ 141 break; \ 142 if (!signal_pending(current)) { \ 143 spu_release(ctx); \ 144 schedule(); \ 145 spu_acquire(ctx); \ 146 continue; \ 147 } \ 148 __ret = -ERESTARTSYS; \ 149 break; \ 150 } \ 151 finish_wait(&(wq), &__wait); \ 152 __ret; \ 153 }) 154 155 size_t spu_wbox_write(struct spu_context *ctx, u32 data); 156 size_t spu_ibox_read(struct spu_context *ctx, u32 *data); 157 158 /* irq callback funcs. */ 159 void spufs_ibox_callback(struct spu *spu); 160 void spufs_wbox_callback(struct spu *spu); 161 void spufs_stop_callback(struct spu *spu); 162 163 #endif 164