arch/powerpc/platforms/cell/spufs/spufs.h

   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_nr          0UL
  41 #define SPU_CONTEXT_PREEMPT             (1UL << SPU_CONTEXT_PREEMPT_nr)
  42
  43 struct spu_context {
  44         struct spu *spu;                  /* pointer to a physical SPU */
  45         struct spu_state csa;             /* SPU context save area. */
  46         spinlock_t mmio_lock;             /* protects mmio access */
  47         struct address_space *local_store;/* local store backing store */
  48
  49         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
  50         struct rw_semaphore state_sema;
  51         struct semaphore run_sema;
  52
  53         struct mm_struct *owner;
  54
  55         struct kref kref;
  56         wait_queue_head_t ibox_wq;
  57         wait_queue_head_t wbox_wq;
  58         wait_queue_head_t stop_wq;
  59         struct fasync_struct *ibox_fasync;
  60         struct fasync_struct *wbox_fasync;
  61         struct spu_context_ops *ops;
  62         struct work_struct reap_work;
  63         u64 flags;
  64 };
  65
  66 /* SPU context query/set operations. */
  67 struct spu_context_ops {
  68         int (*mbox_read) (struct spu_context * ctx, u32 * data);
  69          u32(*mbox_stat_read) (struct spu_context * ctx);
  70         unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
  71                                         unsigned int events);
  72         int (*ibox_read) (struct spu_context * ctx, u32 * data);
  73         int (*wbox_write) (struct spu_context * ctx, u32 data);
  74          u32(*signal1_read) (struct spu_context * ctx);
  75         void (*signal1_write) (struct spu_context * ctx, u32 data);
  76          u32(*signal2_read) (struct spu_context * ctx);
  77         void (*signal2_write) (struct spu_context * ctx, u32 data);
  78         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
  79          u64(*signal1_type_get) (struct spu_context * ctx);
  80         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
  81          u64(*signal2_type_get) (struct spu_context * ctx);
  82          u32(*npc_read) (struct spu_context * ctx);
  83         void (*npc_write) (struct spu_context * ctx, u32 data);
  84          u32(*status_read) (struct spu_context * ctx);
  85         char*(*get_ls) (struct spu_context * ctx);
  86         void (*runcntl_write) (struct spu_context * ctx, u32 data);
  87         void (*runcntl_stop) (struct spu_context * ctx);
  88 };
  89
  90 extern struct spu_context_ops spu_hw_ops;
  91 extern struct spu_context_ops spu_backing_ops;
  92
  93 struct spufs_inode_info {
  94         struct spu_context *i_ctx;
  95         struct inode vfs_inode;
  96 };
  97 #define SPUFS_I(inode) \
  98         container_of(inode, struct spufs_inode_info, vfs_inode)
  99
 100 extern struct tree_descr spufs_dir_contents[];
 101
 102 /* system call implementation */
 103 long spufs_run_spu(struct file *file,
 104                    struct spu_context *ctx, u32 *npc, u32 *status);
 105 long spufs_create_thread(struct nameidata *nd, const char *name,
 106                          unsigned int flags, mode_t mode);
 107 extern struct file_operations spufs_context_fops;
 108
 109 /* context management */
 110 struct spu_context * alloc_spu_context(struct address_space *local_store);
 111 void destroy_spu_context(struct kref *kref);
 112 struct spu_context * get_spu_context(struct spu_context *ctx);
 113 int put_spu_context(struct spu_context *ctx);
 114 void spu_unmap_mappings(struct spu_context *ctx);
 115
 116 void spu_forget(struct spu_context *ctx);
 117 void spu_acquire(struct spu_context *ctx);
 118 void spu_release(struct spu_context *ctx);
 119 int spu_acquire_runnable(struct spu_context *ctx);
 120 void spu_acquire_saved(struct spu_context *ctx);
 121
 122 int spu_activate(struct spu_context *ctx, u64 flags);
 123 void spu_deactivate(struct spu_context *ctx);
 124 void spu_yield(struct spu_context *ctx);
 125 int __init spu_sched_init(void);
 126 void __exit spu_sched_exit(void);
 127
 128 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 129 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 130
 131 /* irq callback funcs. */
 132 void spufs_ibox_callback(struct spu *spu);
 133 void spufs_wbox_callback(struct spu *spu);
 134 void spufs_stop_callback(struct spu *spu);
 135
 136 #endif