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 #include <linux/sched/signal.h>
  31
  32 #include <asm/spu.h>
  33 #include <asm/spu_csa.h>
  34 #include <asm/spu_info.h>
  35
  36 #define SPUFS_PS_MAP_SIZE       0x20000
  37 #define SPUFS_MFC_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         wait_queue_head_t       wait;
  69         unsigned long           head;
  70         unsigned long           tail;
  71         struct switch_log_entry {
  72                 struct timespec tstamp;
  73                 s32             spu_id;
  74                 u32             type;
  75                 u32             val;
  76                 u64             timebase;
  77         } log[];
  78 };
  79
  80 struct spu_context {
  81         struct spu *spu;                  /* pointer to a physical SPU */
  82         struct spu_state csa;             /* SPU context save area. */
  83         spinlock_t mmio_lock;             /* protects mmio access */
  84         struct address_space *local_store; /* local store mapping.  */
  85         struct address_space *mfc;         /* 'mfc' area mappings. */
  86         struct address_space *cntl;        /* 'control' area mappings. */
  87         struct address_space *signal1;     /* 'signal1' area mappings. */
  88         struct address_space *signal2;     /* 'signal2' area mappings. */
  89         struct address_space *mss;         /* 'mss' area mappings. */
  90         struct address_space *psmap;       /* 'psmap' area mappings. */
  91         struct mutex mapping_lock;
  92         u64 object_id;             /* user space pointer for oprofile */
  93
  94         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
  95         struct mutex state_mutex;
  96         struct mutex run_mutex;
  97
  98         struct mm_struct *owner;
  99
 100         struct kref kref;
 101         wait_queue_head_t ibox_wq;
 102         wait_queue_head_t wbox_wq;
 103         wait_queue_head_t stop_wq;
 104         wait_queue_head_t mfc_wq;
 105         wait_queue_head_t run_wq;
 106         u32 tagwait;
 107         struct spu_context_ops *ops;
 108         struct work_struct reap_work;
 109         unsigned long flags;
 110         unsigned long event_return;
 111
 112         struct list_head gang_list;
 113         struct spu_gang *gang;
 114         struct kref *prof_priv_kref;
 115         void ( * prof_priv_release) (struct kref *kref);
 116
 117         /* owner thread */
 118         pid_t tid;
 119
 120         /* scheduler fields */
 121         struct list_head rq;
 122         unsigned int time_slice;
 123         unsigned long sched_flags;
 124         cpumask_t cpus_allowed;
 125         int policy;
 126         int prio;
 127         int last_ran;
 128
 129         /* statistics */
 130         struct {
 131                 /* updates protected by ctx->state_mutex */
 132                 enum spu_utilization_state util_state;
 133                 unsigned long long tstamp;      /* time of last state switch */
 134                 unsigned long long times[SPU_UTIL_MAX];
 135                 unsigned long long vol_ctx_switch;
 136                 unsigned long long invol_ctx_switch;
 137                 unsigned long long min_flt;
 138                 unsigned long long maj_flt;
 139                 unsigned long long hash_flt;
 140                 unsigned long long slb_flt;
 141                 unsigned long long slb_flt_base; /* # at last ctx switch */
 142                 unsigned long long class2_intr;
 143                 unsigned long long class2_intr_base; /* # at last ctx switch */
 144                 unsigned long long libassist;
 145         } stats;
 146
 147         /* context switch log */
 148         struct switch_log *switch_log;
 149
 150         struct list_head aff_list;
 151         int aff_head;
 152         int aff_offset;
 153 };
 154
 155 struct spu_gang {
 156         struct list_head list;
 157         struct mutex mutex;
 158         struct kref kref;
 159         int contexts;
 160
 161         struct spu_context *aff_ref_ctx;
 162         struct list_head aff_list_head;
 163         struct mutex aff_mutex;
 164         int aff_flags;
 165         struct spu *aff_ref_spu;
 166         atomic_t aff_sched_count;
 167 };
 168
 169 /* Flag bits for spu_gang aff_flags */
 170 #define AFF_OFFSETS_SET         1
 171 #define AFF_MERGED              2
 172
 173 struct mfc_dma_command {
 174         int32_t pad;    /* reserved */
 175         uint32_t lsa;   /* local storage address */
 176         uint64_t ea;    /* effective address */
 177         uint16_t size;  /* transfer size */
 178         uint16_t tag;   /* command tag */
 179         uint16_t class; /* class ID */
 180         uint16_t cmd;   /* command opcode */
 181 };
 182
 183
 184 /* SPU context query/set operations. */
 185 struct spu_context_ops {
 186         int (*mbox_read) (struct spu_context * ctx, u32 * data);
 187          u32(*mbox_stat_read) (struct spu_context * ctx);
 188         unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
 189                                         unsigned int events);
 190         int (*ibox_read) (struct spu_context * ctx, u32 * data);
 191         int (*wbox_write) (struct spu_context * ctx, u32 data);
 192          u32(*signal1_read) (struct spu_context * ctx);
 193         void (*signal1_write) (struct spu_context * ctx, u32 data);
 194          u32(*signal2_read) (struct spu_context * ctx);
 195         void (*signal2_write) (struct spu_context * ctx, u32 data);
 196         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
 197          u64(*signal1_type_get) (struct spu_context * ctx);
 198         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
 199          u64(*signal2_type_get) (struct spu_context * ctx);
 200          u32(*npc_read) (struct spu_context * ctx);
 201         void (*npc_write) (struct spu_context * ctx, u32 data);
 202          u32(*status_read) (struct spu_context * ctx);
 203         char*(*get_ls) (struct spu_context * ctx);
 204         void (*privcntl_write) (struct spu_context *ctx, u64 data);
 205          u32 (*runcntl_read) (struct spu_context * ctx);
 206         void (*runcntl_write) (struct spu_context * ctx, u32 data);
 207         void (*runcntl_stop) (struct spu_context * ctx);
 208         void (*master_start) (struct spu_context * ctx);
 209         void (*master_stop) (struct spu_context * ctx);
 210         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
 211         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
 212         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
 213         int (*send_mfc_command)(struct spu_context * ctx,
 214                                 struct mfc_dma_command * cmd);
 215         void (*dma_info_read) (struct spu_context * ctx,
 216                                struct spu_dma_info * info);
 217         void (*proxydma_info_read) (struct spu_context * ctx,
 218                                     struct spu_proxydma_info * info);
 219         void (*restart_dma)(struct spu_context *ctx);
 220 };
 221
 222 extern struct spu_context_ops spu_hw_ops;
 223 extern struct spu_context_ops spu_backing_ops;
 224
 225 struct spufs_inode_info {
 226         struct spu_context *i_ctx;
 227         struct spu_gang *i_gang;
 228         struct inode vfs_inode;
 229         int i_openers;
 230 };
 231 #define SPUFS_I(inode) \
 232         container_of(inode, struct spufs_inode_info, vfs_inode)
 233
 234 struct spufs_tree_descr {
 235         const char *name;
 236         const struct file_operations *ops;
 237         umode_t mode;
 238         size_t size;
 239 };
 240
 241 extern const struct spufs_tree_descr spufs_dir_contents[];
 242 extern const struct spufs_tree_descr spufs_dir_nosched_contents[];
 243 extern const struct spufs_tree_descr spufs_dir_debug_contents[];
 244
 245 /* system call implementation */
 246 extern struct spufs_calls spufs_calls;
 247 struct coredump_params;
 248 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
 249 long spufs_create(struct path *nd, struct dentry *dentry, unsigned int flags,
 250                         umode_t mode, struct file *filp);
 251 /* ELF coredump callbacks for writing SPU ELF notes */
 252 extern int spufs_coredump_extra_notes_size(void);
 253 extern int spufs_coredump_extra_notes_write(struct coredump_params *cprm);
 254
 255 extern const struct file_operations spufs_context_fops;
 256
 257 /* gang management */
 258 struct spu_gang *alloc_spu_gang(void);
 259 struct spu_gang *get_spu_gang(struct spu_gang *gang);
 260 int put_spu_gang(struct spu_gang *gang);
 261 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
 262 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
 263
 264 /* fault handling */
 265 int spufs_handle_class1(struct spu_context *ctx);
 266 int spufs_handle_class0(struct spu_context *ctx);
 267
 268 /* affinity */
 269 struct spu *affinity_check(struct spu_context *ctx);
 270
 271 /* context management */
 272 extern atomic_t nr_spu_contexts;
 273 static inline int __must_check spu_acquire(struct spu_context *ctx)
 274 {
 275         return mutex_lock_interruptible(&ctx->state_mutex);
 276 }
 277
 278 static inline void spu_release(struct spu_context *ctx)
 279 {
 280         mutex_unlock(&ctx->state_mutex);
 281 }
 282
 283 struct spu_context * alloc_spu_context(struct spu_gang *gang);
 284 void destroy_spu_context(struct kref *kref);
 285 struct spu_context * get_spu_context(struct spu_context *ctx);
 286 int put_spu_context(struct spu_context *ctx);
 287 void spu_unmap_mappings(struct spu_context *ctx);
 288
 289 void spu_forget(struct spu_context *ctx);
 290 int __must_check spu_acquire_saved(struct spu_context *ctx);
 291 void spu_release_saved(struct spu_context *ctx);
 292
 293 int spu_stopped(struct spu_context *ctx, u32 * stat);
 294 void spu_del_from_rq(struct spu_context *ctx);
 295 int spu_activate(struct spu_context *ctx, unsigned long flags);
 296 void spu_deactivate(struct spu_context *ctx);
 297 void spu_yield(struct spu_context *ctx);
 298 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
 299 void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
 300                 u32 type, u32 val);
 301 void spu_set_timeslice(struct spu_context *ctx);
 302 void spu_update_sched_info(struct spu_context *ctx);
 303 void __spu_update_sched_info(struct spu_context *ctx);
 304 int __init spu_sched_init(void);
 305 void spu_sched_exit(void);
 306
 307 extern char *isolated_loader;
 308
 309 /*
 310  * spufs_wait
 311  *      Same as wait_event_interruptible(), except that here
 312  *      we need to call spu_release(ctx) before sleeping, and
 313  *      then spu_acquire(ctx) when awoken.
 314  *
 315  *      Returns with state_mutex re-acquired when successful or
 316  *      with -ERESTARTSYS and the state_mutex dropped when interrupted.
 317  */
 318
 319 #define spufs_wait(wq, condition)                                       \
 320 ({                                                                      \
 321         int __ret = 0;                                                  \
 322         DEFINE_WAIT(__wait);                                            \
 323         for (;;) {                                                      \
 324                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
 325                 if (condition)                                          \
 326                         break;                                          \
 327                 spu_release(ctx);                                       \
 328                 if (signal_pending(current)) {                          \
 329                         __ret = -ERESTARTSYS;                           \
 330                         break;                                          \
 331                 }                                                       \
 332                 schedule();                                             \
 333                 __ret = spu_acquire(ctx);                               \
 334                 if (__ret)                                              \
 335                         break;                                          \
 336         }                                                               \
 337         finish_wait(&(wq), &__wait);                                    \
 338         __ret;                                                          \
 339 })
 340
 341 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 342 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 343
 344 /* irq callback funcs. */
 345 void spufs_ibox_callback(struct spu *spu);
 346 void spufs_wbox_callback(struct spu *spu);
 347 void spufs_stop_callback(struct spu *spu, int irq);
 348 void spufs_mfc_callback(struct spu *spu);
 349 void spufs_dma_callback(struct spu *spu, int type);
 350
 351 extern struct spu_coredump_calls spufs_coredump_calls;
 352 struct spufs_coredump_reader {
 353         char *name;
 354         ssize_t (*read)(struct spu_context *ctx,
 355                         char __user *buffer, size_t size, loff_t *pos);
 356         u64 (*get)(struct spu_context *ctx);
 357         size_t size;
 358 };
 359 extern const struct spufs_coredump_reader spufs_coredump_read[];
 360 extern int spufs_coredump_num_notes;
 361
 362 extern int spu_init_csa(struct spu_state *csa);
 363 extern void spu_fini_csa(struct spu_state *csa);
 364 extern int spu_save(struct spu_state *prev, struct spu *spu);
 365 extern int spu_restore(struct spu_state *new, struct spu *spu);
 366 extern int spu_switch(struct spu_state *prev, struct spu_state *new,
 367                       struct spu *spu);
 368 extern int spu_alloc_lscsa(struct spu_state *csa);
 369 extern void spu_free_lscsa(struct spu_state *csa);
 370
 371 extern void spuctx_switch_state(struct spu_context *ctx,
 372                 enum spu_utilization_state new_state);
 373
 374 #endif