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 #include <linux/cpumask.h>
  30
  31 #include <asm/spu.h>
  32 #include <asm/spu_csa.h>
  33 #include <asm/spu_info.h>
  34
  35 /* The magic number for our file system */
  36 enum {
  37         SPUFS_MAGIC = 0x23c9b64e,
  38 };
  39
  40 struct spu_context_ops;
  41 struct spu_gang;
  42
  43 /* ctx->sched_flags */
  44 enum {
  45         SPU_SCHED_NOTIFY_ACTIVE,
  46         SPU_SCHED_WAS_ACTIVE,   /* was active upon spu_acquire_saved()  */
  47 };
  48
  49 struct spu_context {
  50         struct spu *spu;                  /* pointer to a physical SPU */
  51         struct spu_state csa;             /* SPU context save area. */
  52         spinlock_t mmio_lock;             /* protects mmio access */
  53         struct address_space *local_store; /* local store mapping.  */
  54         struct address_space *mfc;         /* 'mfc' area mappings. */
  55         struct address_space *cntl;        /* 'control' area mappings. */
  56         struct address_space *signal1;     /* 'signal1' area mappings. */
  57         struct address_space *signal2;     /* 'signal2' area mappings. */
  58         struct address_space *mss;         /* 'mss' area mappings. */
  59         struct address_space *psmap;       /* 'psmap' area mappings. */
  60         struct mutex mapping_lock;
  61         u64 object_id;             /* user space pointer for oprofile */
  62
  63         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
  64         struct mutex state_mutex;
  65         struct mutex run_mutex;
  66
  67         struct mm_struct *owner;
  68
  69         struct kref kref;
  70         wait_queue_head_t ibox_wq;
  71         wait_queue_head_t wbox_wq;
  72         wait_queue_head_t stop_wq;
  73         wait_queue_head_t mfc_wq;
  74         wait_queue_head_t run_wq;
  75         struct fasync_struct *ibox_fasync;
  76         struct fasync_struct *wbox_fasync;
  77         struct fasync_struct *mfc_fasync;
  78         u32 tagwait;
  79         struct spu_context_ops *ops;
  80         struct work_struct reap_work;
  81         unsigned long flags;
  82         unsigned long event_return;
  83
  84         struct list_head gang_list;
  85         struct spu_gang *gang;
  86         struct kref *prof_priv_kref;
  87         void ( * prof_priv_release) (struct kref *kref);
  88
  89         /* owner thread */
  90         pid_t tid;
  91
  92         /* scheduler fields */
  93         struct list_head rq;
  94         unsigned int time_slice;
  95         unsigned long sched_flags;
  96         cpumask_t cpus_allowed;
  97         int policy;
  98         int prio;
  99
 100         /* statistics */
 101         struct {
 102                 /* updates protected by ctx->state_mutex */
 103                 enum spu_utilization_state util_state;
 104                 unsigned long long tstamp;      /* time of last state switch */
 105                 unsigned long long times[SPU_UTIL_MAX];
 106                 unsigned long long vol_ctx_switch;
 107                 unsigned long long invol_ctx_switch;
 108                 unsigned long long min_flt;
 109                 unsigned long long maj_flt;
 110                 unsigned long long hash_flt;
 111                 unsigned long long slb_flt;
 112                 unsigned long long slb_flt_base; /* # at last ctx switch */
 113                 unsigned long long class2_intr;
 114                 unsigned long long class2_intr_base; /* # at last ctx switch */
 115                 unsigned long long libassist;
 116         } stats;
 117
 118         struct list_head aff_list;
 119         int aff_head;
 120         int aff_offset;
 121 };
 122
 123 struct spu_gang {
 124         struct list_head list;
 125         struct mutex mutex;
 126         struct kref kref;
 127         int contexts;
 128
 129         struct spu_context *aff_ref_ctx;
 130         struct list_head aff_list_head;
 131         struct mutex aff_mutex;
 132         int aff_flags;
 133         struct spu *aff_ref_spu;
 134         atomic_t aff_sched_count;
 135 };
 136
 137 /* Flag bits for spu_gang aff_flags */
 138 #define AFF_OFFSETS_SET         1
 139 #define AFF_MERGED              2
 140
 141 struct mfc_dma_command {
 142         int32_t pad;    /* reserved */
 143         uint32_t lsa;   /* local storage address */
 144         uint64_t ea;    /* effective address */
 145         uint16_t size;  /* transfer size */
 146         uint16_t tag;   /* command tag */
 147         uint16_t class; /* class ID */
 148         uint16_t cmd;   /* command opcode */
 149 };
 150
 151
 152 /* SPU context query/set operations. */
 153 struct spu_context_ops {
 154         int (*mbox_read) (struct spu_context * ctx, u32 * data);
 155          u32(*mbox_stat_read) (struct spu_context * ctx);
 156         unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
 157                                         unsigned int events);
 158         int (*ibox_read) (struct spu_context * ctx, u32 * data);
 159         int (*wbox_write) (struct spu_context * ctx, u32 data);
 160          u32(*signal1_read) (struct spu_context * ctx);
 161         void (*signal1_write) (struct spu_context * ctx, u32 data);
 162          u32(*signal2_read) (struct spu_context * ctx);
 163         void (*signal2_write) (struct spu_context * ctx, u32 data);
 164         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
 165          u64(*signal1_type_get) (struct spu_context * ctx);
 166         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
 167          u64(*signal2_type_get) (struct spu_context * ctx);
 168          u32(*npc_read) (struct spu_context * ctx);
 169         void (*npc_write) (struct spu_context * ctx, u32 data);
 170          u32(*status_read) (struct spu_context * ctx);
 171         char*(*get_ls) (struct spu_context * ctx);
 172         void (*privcntl_write) (struct spu_context *ctx, u64 data);
 173          u32 (*runcntl_read) (struct spu_context * ctx);
 174         void (*runcntl_write) (struct spu_context * ctx, u32 data);
 175         void (*runcntl_stop) (struct spu_context * ctx);
 176         void (*master_start) (struct spu_context * ctx);
 177         void (*master_stop) (struct spu_context * ctx);
 178         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
 179         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
 180         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
 181         int (*send_mfc_command)(struct spu_context * ctx,
 182                                 struct mfc_dma_command * cmd);
 183         void (*dma_info_read) (struct spu_context * ctx,
 184                                struct spu_dma_info * info);
 185         void (*proxydma_info_read) (struct spu_context * ctx,
 186                                     struct spu_proxydma_info * info);
 187         void (*restart_dma)(struct spu_context *ctx);
 188 };
 189
 190 extern struct spu_context_ops spu_hw_ops;
 191 extern struct spu_context_ops spu_backing_ops;
 192
 193 struct spufs_inode_info {
 194         struct spu_context *i_ctx;
 195         struct spu_gang *i_gang;
 196         struct inode vfs_inode;
 197         int i_openers;
 198 };
 199 #define SPUFS_I(inode) \
 200         container_of(inode, struct spufs_inode_info, vfs_inode)
 201
 202 extern struct tree_descr spufs_dir_contents[];
 203 extern struct tree_descr spufs_dir_nosched_contents[];
 204
 205 /* system call implementation */
 206 extern struct spufs_calls spufs_calls;
 207 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
 208 long spufs_create(struct nameidata *nd, unsigned int flags,
 209                         mode_t mode, struct file *filp);
 210 /* ELF coredump callbacks for writing SPU ELF notes */
 211 extern int spufs_coredump_extra_notes_size(void);
 212 extern int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset);
 213
 214 extern const struct file_operations spufs_context_fops;
 215
 216 /* gang management */
 217 struct spu_gang *alloc_spu_gang(void);
 218 struct spu_gang *get_spu_gang(struct spu_gang *gang);
 219 int put_spu_gang(struct spu_gang *gang);
 220 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
 221 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
 222
 223 /* fault handling */
 224 int spufs_handle_class1(struct spu_context *ctx);
 225 int spufs_handle_class0(struct spu_context *ctx);
 226
 227 /* affinity */
 228 struct spu *affinity_check(struct spu_context *ctx);
 229
 230 /* context management */
 231 extern atomic_t nr_spu_contexts;
 232 static inline int __must_check spu_acquire(struct spu_context *ctx)
 233 {
 234         return mutex_lock_interruptible(&ctx->state_mutex);
 235 }
 236
 237 static inline void spu_release(struct spu_context *ctx)
 238 {
 239         mutex_unlock(&ctx->state_mutex);
 240 }
 241
 242 struct spu_context * alloc_spu_context(struct spu_gang *gang);
 243 void destroy_spu_context(struct kref *kref);
 244 struct spu_context * get_spu_context(struct spu_context *ctx);
 245 int put_spu_context(struct spu_context *ctx);
 246 void spu_unmap_mappings(struct spu_context *ctx);
 247
 248 void spu_forget(struct spu_context *ctx);
 249 int __must_check spu_acquire_saved(struct spu_context *ctx);
 250 void spu_release_saved(struct spu_context *ctx);
 251
 252 int spu_stopped(struct spu_context *ctx, u32 * stat);
 253 void spu_del_from_rq(struct spu_context *ctx);
 254 int spu_activate(struct spu_context *ctx, unsigned long flags);
 255 void spu_deactivate(struct spu_context *ctx);
 256 void spu_yield(struct spu_context *ctx);
 257 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
 258 void spu_set_timeslice(struct spu_context *ctx);
 259 void spu_update_sched_info(struct spu_context *ctx);
 260 void __spu_update_sched_info(struct spu_context *ctx);
 261 int __init spu_sched_init(void);
 262 void spu_sched_exit(void);
 263
 264 extern char *isolated_loader;
 265
 266 /*
 267  * spufs_wait
 268  *      Same as wait_event_interruptible(), except that here
 269  *      we need to call spu_release(ctx) before sleeping, and
 270  *      then spu_acquire(ctx) when awoken.
 271  */
 272
 273 #define spufs_wait(wq, condition)                                       \
 274 ({                                                                      \
 275         int __ret = 0;                                                  \
 276         DEFINE_WAIT(__wait);                                            \
 277         for (;;) {                                                      \
 278                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
 279                 if (condition)                                          \
 280                         break;                                          \
 281                 if (signal_pending(current)) {                          \
 282                         __ret = -ERESTARTSYS;                           \
 283                         break;                                          \
 284                 }                                                       \
 285                 spu_release(ctx);                                       \
 286                 schedule();                                             \
 287                 __ret = spu_acquire(ctx);                               \
 288                 if (__ret)                                              \
 289                         break;                                          \
 290         }                                                               \
 291         finish_wait(&(wq), &__wait);                                    \
 292         __ret;                                                          \
 293 })
 294
 295 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 296 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 297
 298 /* irq callback funcs. */
 299 void spufs_ibox_callback(struct spu *spu);
 300 void spufs_wbox_callback(struct spu *spu);
 301 void spufs_stop_callback(struct spu *spu);
 302 void spufs_mfc_callback(struct spu *spu);
 303 void spufs_dma_callback(struct spu *spu, int type);
 304
 305 extern struct spu_coredump_calls spufs_coredump_calls;
 306 struct spufs_coredump_reader {
 307         char *name;
 308         ssize_t (*read)(struct spu_context *ctx,
 309                         char __user *buffer, size_t size, loff_t *pos);
 310         u64 (*get)(struct spu_context *ctx);
 311         size_t size;
 312 };
 313 extern struct spufs_coredump_reader spufs_coredump_read[];
 314 extern int spufs_coredump_num_notes;
 315
 316 extern int spu_init_csa(struct spu_state *csa);
 317 extern void spu_fini_csa(struct spu_state *csa);
 318 extern int spu_save(struct spu_state *prev, struct spu *spu);
 319 extern int spu_restore(struct spu_state *new, struct spu *spu);
 320 extern int spu_switch(struct spu_state *prev, struct spu_state *new,
 321                       struct spu *spu);
 322 extern int spu_alloc_lscsa(struct spu_state *csa);
 323 extern void spu_free_lscsa(struct spu_state *csa);
 324
 325 extern void spuctx_switch_state(struct spu_context *ctx,
 326                 enum spu_utilization_state new_state);
 327
 328 #endif