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 #define SPUFS_PS_MAP_SIZE       0x20000
  36 #define SPUFS_MFC_MAP_SIZE      0x1000
  37 #define SPUFS_CNTL_MAP_SIZE     0x1000
  38 #define SPUFS_CNTL_MAP_SIZE     0x1000
  39 #define SPUFS_SIGNAL_MAP_SIZE   PAGE_SIZE
  40 #define SPUFS_MSS_MAP_SIZE      0x1000
  41
  42 /* The magic number for our file system */
  43 enum {
  44         SPUFS_MAGIC = 0x23c9b64e,
  45 };
  46
  47 struct spu_context_ops;
  48 struct spu_gang;
  49
  50 /* ctx->sched_flags */
  51 enum {
  52         SPU_SCHED_NOTIFY_ACTIVE,
  53         SPU_SCHED_WAS_ACTIVE,   /* was active upon spu_acquire_saved()  */
  54         SPU_SCHED_SPU_RUN,      /* context is within spu_run */
  55 };
  56
  57 enum {
  58         SWITCH_LOG_BUFSIZE = 4096,
  59 };
  60
  61 enum {
  62         SWITCH_LOG_START,
  63         SWITCH_LOG_STOP,
  64         SWITCH_LOG_EXIT,
  65 };
  66
  67 struct switch_log {
  68         spinlock_t              lock;
  69         wait_queue_head_t       wait;
  70         unsigned long           head;
  71         unsigned long           tail;
  72         struct switch_log_entry {
  73                 struct timespec tstamp;
  74                 s32             spu_id;
  75                 u32             type;
  76                 u32             val;
  77                 u64             timebase;
  78         } log[];
  79 };
  80
  81 struct spu_context {
  82         struct spu *spu;                  /* pointer to a physical SPU */
  83         struct spu_state csa;             /* SPU context save area. */
  84         spinlock_t mmio_lock;             /* protects mmio access */
  85         struct address_space *local_store; /* local store mapping.  */
  86         struct address_space *mfc;         /* 'mfc' area mappings. */
  87         struct address_space *cntl;        /* 'control' area mappings. */
  88         struct address_space *signal1;     /* 'signal1' area mappings. */
  89         struct address_space *signal2;     /* 'signal2' area mappings. */
  90         struct address_space *mss;         /* 'mss' area mappings. */
  91         struct address_space *psmap;       /* 'psmap' area mappings. */
  92         struct mutex mapping_lock;
  93         u64 object_id;             /* user space pointer for oprofile */
  94
  95         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
  96         struct mutex state_mutex;
  97         struct mutex run_mutex;
  98
  99         struct mm_struct *owner;
 100
 101         struct kref kref;
 102         wait_queue_head_t ibox_wq;
 103         wait_queue_head_t wbox_wq;
 104         wait_queue_head_t stop_wq;
 105         wait_queue_head_t mfc_wq;
 106         wait_queue_head_t run_wq;
 107         struct fasync_struct *ibox_fasync;
 108         struct fasync_struct *wbox_fasync;
 109         struct fasync_struct *mfc_fasync;
 110         u32 tagwait;
 111         struct spu_context_ops *ops;
 112         struct work_struct reap_work;
 113         unsigned long flags;
 114         unsigned long event_return;
 115
 116         struct list_head gang_list;
 117         struct spu_gang *gang;
 118         struct kref *prof_priv_kref;
 119         void ( * prof_priv_release) (struct kref *kref);
 120
 121         /* owner thread */
 122         pid_t tid;
 123
 124         /* scheduler fields */
 125         struct list_head rq;
 126         unsigned int time_slice;
 127         unsigned long sched_flags;
 128         cpumask_t cpus_allowed;
 129         int policy;
 130         int prio;
 131         int last_ran;
 132
 133         /* statistics */
 134         struct {
 135                 /* updates protected by ctx->state_mutex */
 136                 enum spu_utilization_state util_state;
 137                 unsigned long long tstamp;      /* time of last state switch */
 138                 unsigned long long times[SPU_UTIL_MAX];
 139                 unsigned long long vol_ctx_switch;
 140                 unsigned long long invol_ctx_switch;
 141                 unsigned long long min_flt;
 142                 unsigned long long maj_flt;
 143                 unsigned long long hash_flt;
 144                 unsigned long long slb_flt;
 145                 unsigned long long slb_flt_base; /* # at last ctx switch */
 146                 unsigned long long class2_intr;
 147                 unsigned long long class2_intr_base; /* # at last ctx switch */
 148                 unsigned long long libassist;
 149         } stats;
 150
 151         /* context switch log */
 152         struct switch_log *switch_log;
 153
 154         struct list_head aff_list;
 155         int aff_head;
 156         int aff_offset;
 157 };
 158
 159 struct spu_gang {
 160         struct list_head list;
 161         struct mutex mutex;
 162         struct kref kref;
 163         int contexts;
 164
 165         struct spu_context *aff_ref_ctx;
 166         struct list_head aff_list_head;
 167         struct mutex aff_mutex;
 168         int aff_flags;
 169         struct spu *aff_ref_spu;
 170         atomic_t aff_sched_count;
 171 };
 172
 173 /* Flag bits for spu_gang aff_flags */
 174 #define AFF_OFFSETS_SET         1
 175 #define AFF_MERGED              2
 176
 177 struct mfc_dma_command {
 178         int32_t pad;    /* reserved */
 179         uint32_t lsa;   /* local storage address */
 180         uint64_t ea;    /* effective address */
 181         uint16_t size;  /* transfer size */
 182         uint16_t tag;   /* command tag */
 183         uint16_t class; /* class ID */
 184         uint16_t cmd;   /* command opcode */
 185 };
 186
 187
 188 /* SPU context query/set operations. */
 189 struct spu_context_ops {
 190         int (*mbox_read) (struct spu_context * ctx, u32 * data);
 191          u32(*mbox_stat_read) (struct spu_context * ctx);
 192         unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
 193                                         unsigned int events);
 194         int (*ibox_read) (struct spu_context * ctx, u32 * data);
 195         int (*wbox_write) (struct spu_context * ctx, u32 data);
 196          u32(*signal1_read) (struct spu_context * ctx);
 197         void (*signal1_write) (struct spu_context * ctx, u32 data);
 198          u32(*signal2_read) (struct spu_context * ctx);
 199         void (*signal2_write) (struct spu_context * ctx, u32 data);
 200         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
 201          u64(*signal1_type_get) (struct spu_context * ctx);
 202         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
 203          u64(*signal2_type_get) (struct spu_context * ctx);
 204          u32(*npc_read) (struct spu_context * ctx);
 205         void (*npc_write) (struct spu_context * ctx, u32 data);
 206          u32(*status_read) (struct spu_context * ctx);
 207         char*(*get_ls) (struct spu_context * ctx);
 208         void (*privcntl_write) (struct spu_context *ctx, u64 data);
 209          u32 (*runcntl_read) (struct spu_context * ctx);
 210         void (*runcntl_write) (struct spu_context * ctx, u32 data);
 211         void (*runcntl_stop) (struct spu_context * ctx);
 212         void (*master_start) (struct spu_context * ctx);
 213         void (*master_stop) (struct spu_context * ctx);
 214         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
 215         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
 216         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
 217         int (*send_mfc_command)(struct spu_context * ctx,
 218                                 struct mfc_dma_command * cmd);
 219         void (*dma_info_read) (struct spu_context * ctx,
 220                                struct spu_dma_info * info);
 221         void (*proxydma_info_read) (struct spu_context * ctx,
 222                                     struct spu_proxydma_info * info);
 223         void (*restart_dma)(struct spu_context *ctx);
 224 };
 225
 226 extern struct spu_context_ops spu_hw_ops;
 227 extern struct spu_context_ops spu_backing_ops;
 228
 229 struct spufs_inode_info {
 230         struct spu_context *i_ctx;
 231         struct spu_gang *i_gang;
 232         struct inode vfs_inode;
 233         int i_openers;
 234 };
 235 #define SPUFS_I(inode) \
 236         container_of(inode, struct spufs_inode_info, vfs_inode)
 237
 238 struct spufs_tree_descr {
 239         const char *name;
 240         const struct file_operations *ops;
 241         int mode;
 242         size_t size;
 243 };
 244
 245 extern struct spufs_tree_descr spufs_dir_contents[];
 246 extern struct spufs_tree_descr spufs_dir_nosched_contents[];
 247 extern struct spufs_tree_descr spufs_dir_debug_contents[];
 248
 249 /* system call implementation */
 250 extern struct spufs_calls spufs_calls;
 251 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
 252 long spufs_create(struct nameidata *nd, unsigned int flags,
 253                         mode_t mode, struct file *filp);
 254 /* ELF coredump callbacks for writing SPU ELF notes */
 255 extern int spufs_coredump_extra_notes_size(void);
 256 extern int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset);
 257
 258 extern const struct file_operations spufs_context_fops;
 259
 260 /* gang management */
 261 struct spu_gang *alloc_spu_gang(void);
 262 struct spu_gang *get_spu_gang(struct spu_gang *gang);
 263 int put_spu_gang(struct spu_gang *gang);
 264 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
 265 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
 266
 267 /* fault handling */
 268 int spufs_handle_class1(struct spu_context *ctx);
 269 int spufs_handle_class0(struct spu_context *ctx);
 270
 271 /* affinity */
 272 struct spu *affinity_check(struct spu_context *ctx);
 273
 274 /* context management */
 275 extern atomic_t nr_spu_contexts;
 276 static inline int __must_check spu_acquire(struct spu_context *ctx)
 277 {
 278         return mutex_lock_interruptible(&ctx->state_mutex);
 279 }
 280
 281 static inline void spu_release(struct spu_context *ctx)
 282 {
 283         mutex_unlock(&ctx->state_mutex);
 284 }
 285
 286 struct spu_context * alloc_spu_context(struct spu_gang *gang);
 287 void destroy_spu_context(struct kref *kref);
 288 struct spu_context * get_spu_context(struct spu_context *ctx);
 289 int put_spu_context(struct spu_context *ctx);
 290 void spu_unmap_mappings(struct spu_context *ctx);
 291
 292 void spu_forget(struct spu_context *ctx);
 293 int __must_check spu_acquire_saved(struct spu_context *ctx);
 294 void spu_release_saved(struct spu_context *ctx);
 295
 296 int spu_stopped(struct spu_context *ctx, u32 * stat);
 297 void spu_del_from_rq(struct spu_context *ctx);
 298 int spu_activate(struct spu_context *ctx, unsigned long flags);
 299 void spu_deactivate(struct spu_context *ctx);
 300 void spu_yield(struct spu_context *ctx);
 301 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
 302 void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
 303                 u32 type, u32 val);
 304 void spu_set_timeslice(struct spu_context *ctx);
 305 void spu_update_sched_info(struct spu_context *ctx);
 306 void __spu_update_sched_info(struct spu_context *ctx);
 307 int __init spu_sched_init(void);
 308 void spu_sched_exit(void);
 309
 310 extern char *isolated_loader;
 311
 312 /*
 313  * spufs_wait
 314  *      Same as wait_event_interruptible(), except that here
 315  *      we need to call spu_release(ctx) before sleeping, and
 316  *      then spu_acquire(ctx) when awoken.
 317  *
 318  *      Returns with state_mutex re-acquired when successfull or
 319  *      with -ERESTARTSYS and the state_mutex dropped when interrupted.
 320  */
 321
 322 #define spufs_wait(wq, condition)                                       \
 323 ({                                                                      \
 324         int __ret = 0;                                                  \
 325         DEFINE_WAIT(__wait);                                            \
 326         for (;;) {                                                      \
 327                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
 328                 if (condition)                                          \
 329                         break;                                          \
 330                 spu_release(ctx);                                       \
 331                 if (signal_pending(current)) {                          \
 332                         __ret = -ERESTARTSYS;                           \
 333                         break;                                          \
 334                 }                                                       \
 335                 schedule();                                             \
 336                 __ret = spu_acquire(ctx);                               \
 337                 if (__ret)                                              \
 338                         break;                                          \
 339         }                                                               \
 340         finish_wait(&(wq), &__wait);                                    \
 341         __ret;                                                          \
 342 })
 343
 344 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 345 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 346
 347 /* irq callback funcs. */
 348 void spufs_ibox_callback(struct spu *spu);
 349 void spufs_wbox_callback(struct spu *spu);
 350 void spufs_stop_callback(struct spu *spu, int irq);
 351 void spufs_mfc_callback(struct spu *spu);
 352 void spufs_dma_callback(struct spu *spu, int type);
 353
 354 extern struct spu_coredump_calls spufs_coredump_calls;
 355 struct spufs_coredump_reader {
 356         char *name;
 357         ssize_t (*read)(struct spu_context *ctx,
 358                         char __user *buffer, size_t size, loff_t *pos);
 359         u64 (*get)(struct spu_context *ctx);
 360         size_t size;
 361 };
 362 extern struct spufs_coredump_reader spufs_coredump_read[];
 363 extern int spufs_coredump_num_notes;
 364
 365 extern int spu_init_csa(struct spu_state *csa);
 366 extern void spu_fini_csa(struct spu_state *csa);
 367 extern int spu_save(struct spu_state *prev, struct spu *spu);
 368 extern int spu_restore(struct spu_state *new, struct spu *spu);
 369 extern int spu_switch(struct spu_state *prev, struct spu_state *new,
 370                       struct spu *spu);
 371 extern int spu_alloc_lscsa(struct spu_state *csa);
 372 extern void spu_free_lscsa(struct spu_state *csa);
 373
 374 extern void spuctx_switch_state(struct spu_context *ctx,
 375                 enum spu_utilization_state new_state);
 376
 377 #define spu_context_trace(name, ctx, spu) \
 378         trace_mark(name, "ctx %p spu %p", ctx, spu);
 379 #define spu_context_nospu_trace(name, ctx) \
 380         trace_mark(name, "ctx %p", ctx);
 381
 382 #endif