release/src-rt-6.x/linux/linux-2.6/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/mutex.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/fs.h>
  29
  30 #include <asm/spu.h>
  31 #include <asm/spu_csa.h>
  32 #include <asm/spu_info.h>
  33
  34 /* The magic number for our file system */
  35 enum {
  36         SPUFS_MAGIC = 0x23c9b64e,
  37 };
  38
  39 struct spu_context_ops;
  40 struct spu_gang;
  41
  42 /* ctx->sched_flags */
  43 enum {
  44         SPU_SCHED_EXITING = 0,
  45 };
  46
  47 struct spu_context {
  48         struct spu *spu;                  /* pointer to a physical SPU */
  49         struct spu_state csa;             /* SPU context save area. */
  50         spinlock_t mmio_lock;             /* protects mmio access */
  51         struct address_space *local_store; /* local store mapping.  */
  52         struct address_space *mfc;         /* 'mfc' area mappings. */
  53         struct address_space *cntl;        /* 'control' area mappings. */
  54         struct address_space *signal1;     /* 'signal1' area mappings. */
  55         struct address_space *signal2;     /* 'signal2' area mappings. */
  56         struct address_space *mss;         /* 'mss' area mappings. */
  57         struct address_space *psmap;       /* 'psmap' area mappings. */
  58         struct mutex mapping_lock;
  59         u64 object_id;             /* user space pointer for oprofile */
  60
  61         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
  62         struct mutex state_mutex;
  63         struct mutex run_mutex;
  64
  65         struct mm_struct *owner;
  66
  67         struct kref kref;
  68         wait_queue_head_t ibox_wq;
  69         wait_queue_head_t wbox_wq;
  70         wait_queue_head_t stop_wq;
  71         wait_queue_head_t mfc_wq;
  72         struct fasync_struct *ibox_fasync;
  73         struct fasync_struct *wbox_fasync;
  74         struct fasync_struct *mfc_fasync;
  75         u32 tagwait;
  76         struct spu_context_ops *ops;
  77         struct work_struct reap_work;
  78         unsigned long flags;
  79         unsigned long event_return;
  80
  81         struct list_head gang_list;
  82         struct spu_gang *gang;
  83
  84         /* scheduler fields */
  85         struct list_head rq;
  86         struct delayed_work sched_work;
  87         unsigned long sched_flags;
  88         unsigned long rt_priority;
  89         int policy;
  90         int prio;
  91 };
  92
  93 struct spu_gang {
  94         struct list_head list;
  95         struct mutex mutex;
  96         struct kref kref;
  97         int contexts;
  98 };
  99
 100 struct mfc_dma_command {
 101         int32_t pad;    /* reserved */
 102         uint32_t lsa;   /* local storage address */
 103         uint64_t ea;    /* effective address */
 104         uint16_t size;  /* transfer size */
 105         uint16_t tag;   /* command tag */
 106         uint16_t class; /* class ID */
 107         uint16_t cmd;   /* command opcode */
 108 };
 109
 110
 111 /* SPU context query/set operations. */
 112 struct spu_context_ops {
 113         int (*mbox_read) (struct spu_context * ctx, u32 * data);
 114          u32(*mbox_stat_read) (struct spu_context * ctx);
 115         unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
 116                                         unsigned int events);
 117         int (*ibox_read) (struct spu_context * ctx, u32 * data);
 118         int (*wbox_write) (struct spu_context * ctx, u32 data);
 119          u32(*signal1_read) (struct spu_context * ctx);
 120         void (*signal1_write) (struct spu_context * ctx, u32 data);
 121          u32(*signal2_read) (struct spu_context * ctx);
 122         void (*signal2_write) (struct spu_context * ctx, u32 data);
 123         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
 124          u64(*signal1_type_get) (struct spu_context * ctx);
 125         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
 126          u64(*signal2_type_get) (struct spu_context * ctx);
 127          u32(*npc_read) (struct spu_context * ctx);
 128         void (*npc_write) (struct spu_context * ctx, u32 data);
 129          u32(*status_read) (struct spu_context * ctx);
 130         char*(*get_ls) (struct spu_context * ctx);
 131          u32 (*runcntl_read) (struct spu_context * ctx);
 132         void (*runcntl_write) (struct spu_context * ctx, u32 data);
 133         void (*master_start) (struct spu_context * ctx);
 134         void (*master_stop) (struct spu_context * ctx);
 135         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
 136         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
 137         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
 138         int (*send_mfc_command)(struct spu_context * ctx,
 139                                 struct mfc_dma_command * cmd);
 140         void (*dma_info_read) (struct spu_context * ctx,
 141                                struct spu_dma_info * info);
 142         void (*proxydma_info_read) (struct spu_context * ctx,
 143                                     struct spu_proxydma_info * info);
 144         void (*restart_dma)(struct spu_context *ctx);
 145 };
 146
 147 extern struct spu_context_ops spu_hw_ops;
 148 extern struct spu_context_ops spu_backing_ops;
 149
 150 struct spufs_inode_info {
 151         struct spu_context *i_ctx;
 152         struct spu_gang *i_gang;
 153         struct inode vfs_inode;
 154         int i_openers;
 155 };
 156 #define SPUFS_I(inode) \
 157         container_of(inode, struct spufs_inode_info, vfs_inode)
 158
 159 extern struct tree_descr spufs_dir_contents[];
 160 extern struct tree_descr spufs_dir_nosched_contents[];
 161
 162 /* system call implementation */
 163 long spufs_run_spu(struct file *file,
 164                    struct spu_context *ctx, u32 *npc, u32 *status);
 165 long spufs_create(struct nameidata *nd,
 166                          unsigned int flags, mode_t mode);
 167 extern const struct file_operations spufs_context_fops;
 168
 169 /* gang management */
 170 struct spu_gang *alloc_spu_gang(void);
 171 struct spu_gang *get_spu_gang(struct spu_gang *gang);
 172 int put_spu_gang(struct spu_gang *gang);
 173 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
 174 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
 175
 176 /* fault handling */
 177 int spufs_handle_class1(struct spu_context *ctx);
 178
 179 /* context management */
 180 static inline void spu_acquire(struct spu_context *ctx)
 181 {
 182         mutex_lock(&ctx->state_mutex);
 183 }
 184
 185 static inline void spu_release(struct spu_context *ctx)
 186 {
 187         mutex_unlock(&ctx->state_mutex);
 188 }
 189
 190 struct spu_context * alloc_spu_context(struct spu_gang *gang);
 191 void destroy_spu_context(struct kref *kref);
 192 struct spu_context * get_spu_context(struct spu_context *ctx);
 193 int put_spu_context(struct spu_context *ctx);
 194 void spu_unmap_mappings(struct spu_context *ctx);
 195
 196 void spu_forget(struct spu_context *ctx);
 197 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
 198 void spu_acquire_saved(struct spu_context *ctx);
 199
 200 int spu_activate(struct spu_context *ctx, unsigned long flags);
 201 void spu_deactivate(struct spu_context *ctx);
 202 void spu_yield(struct spu_context *ctx);
 203 void spu_start_tick(struct spu_context *ctx);
 204 void spu_stop_tick(struct spu_context *ctx);
 205 void spu_sched_tick(struct work_struct *work);
 206 int __init spu_sched_init(void);
 207 void __exit spu_sched_exit(void);
 208
 209 extern char *isolated_loader;
 210
 211 /*
 212  * spufs_wait
 213  *      Same as wait_event_interruptible(), except that here
 214  *      we need to call spu_release(ctx) before sleeping, and
 215  *      then spu_acquire(ctx) when awoken.
 216  */
 217
 218 #define spufs_wait(wq, condition)                                       \
 219 ({                                                                      \
 220         int __ret = 0;                                                  \
 221         DEFINE_WAIT(__wait);                                            \
 222         for (;;) {                                                      \
 223                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
 224                 if (condition)                                          \
 225                         break;                                          \
 226                 if (signal_pending(current)) {                          \
 227                         __ret = -ERESTARTSYS;                           \
 228                         break;                                          \
 229                 }                                                       \
 230                 spu_release(ctx);                                       \
 231                 schedule();                                             \
 232                 spu_acquire(ctx);                                       \
 233         }                                                               \
 234         finish_wait(&(wq), &__wait);                                    \
 235         __ret;                                                          \
 236 })
 237
 238 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 239 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 240
 241 /* irq callback funcs. */
 242 void spufs_ibox_callback(struct spu *spu);
 243 void spufs_wbox_callback(struct spu *spu);
 244 void spufs_stop_callback(struct spu *spu);
 245 void spufs_mfc_callback(struct spu *spu);
 246 void spufs_dma_callback(struct spu *spu, int type);
 247
 248 extern struct spu_coredump_calls spufs_coredump_calls;
 249 struct spufs_coredump_reader {
 250         char *name;
 251         ssize_t (*read)(struct spu_context *ctx,
 252                         char __user *buffer, size_t size, loff_t *pos);
 253         u64 (*get)(void *data);
 254         size_t size;
 255 };
 256 extern struct spufs_coredump_reader spufs_coredump_read[];
 257 extern int spufs_coredump_num_notes;
 258
 259 #endif