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

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * SPU file system
   4  *
   5  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   6  *
   7  * Author: Arnd Bergmann <arndb@de.ibm.com>
   8  */
   9 #ifndef SPUFS_H
  10 #define SPUFS_H
  11
  12 #include <linux/kref.h>
  13 #include <linux/mutex.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/fs.h>
  16 #include <linux/cpumask.h>
  17 #include <linux/sched/signal.h>
  18
  19 #include <asm/spu.h>
  20 #include <asm/spu_csa.h>
  21 #include <asm/spu_info.h>
  22
  23 #define SPUFS_PS_MAP_SIZE       0x20000
  24 #define SPUFS_MFC_MAP_SIZE      0x1000
  25 #define SPUFS_CNTL_MAP_SIZE     0x1000
  26 #define SPUFS_SIGNAL_MAP_SIZE   PAGE_SIZE
  27 #define SPUFS_MSS_MAP_SIZE      0x1000
  28
  29 /* The magic number for our file system */
  30 enum {
  31         SPUFS_MAGIC = 0x23c9b64e,
  32 };
  33
  34 struct spu_context_ops;
  35 struct spu_gang;
  36
  37 /* ctx->sched_flags */
  38 enum {
  39         SPU_SCHED_NOTIFY_ACTIVE,
  40         SPU_SCHED_WAS_ACTIVE,   /* was active upon spu_acquire_saved()  */
  41         SPU_SCHED_SPU_RUN,      /* context is within spu_run */
  42 };
  43
  44 enum {
  45         SWITCH_LOG_BUFSIZE = 4096,
  46 };
  47
  48 enum {
  49         SWITCH_LOG_START,
  50         SWITCH_LOG_STOP,
  51         SWITCH_LOG_EXIT,
  52 };
  53
  54 struct switch_log {
  55         wait_queue_head_t       wait;
  56         unsigned long           head;
  57         unsigned long           tail;
  58         struct switch_log_entry {
  59                 struct timespec64 tstamp;
  60                 s32             spu_id;
  61                 u32             type;
  62                 u32             val;
  63                 u64             timebase;
  64         } log[];
  65 };
  66
  67 struct spu_context {
  68         struct spu *spu;                  /* pointer to a physical SPU */
  69         struct spu_state csa;             /* SPU context save area. */
  70         spinlock_t mmio_lock;             /* protects mmio access */
  71         struct address_space *local_store; /* local store mapping.  */
  72         struct address_space *mfc;         /* 'mfc' area mappings. */
  73         struct address_space *cntl;        /* 'control' area mappings. */
  74         struct address_space *signal1;     /* 'signal1' area mappings. */
  75         struct address_space *signal2;     /* 'signal2' area mappings. */
  76         struct address_space *mss;         /* 'mss' area mappings. */
  77         struct address_space *psmap;       /* 'psmap' area mappings. */
  78         struct mutex mapping_lock;
  79         u64 object_id;             /* user space pointer for oprofile */
  80
  81         enum { SPU_STATE_RUNNABLE, SPU_STATE_SAVED } state;
  82         struct mutex state_mutex;
  83         struct mutex run_mutex;
  84
  85         struct mm_struct *owner;
  86
  87         struct kref kref;
  88         wait_queue_head_t ibox_wq;
  89         wait_queue_head_t wbox_wq;
  90         wait_queue_head_t stop_wq;
  91         wait_queue_head_t mfc_wq;
  92         wait_queue_head_t run_wq;
  93         u32 tagwait;
  94         struct spu_context_ops *ops;
  95         struct work_struct reap_work;
  96         unsigned long flags;
  97         unsigned long event_return;
  98
  99         struct list_head gang_list;
 100         struct spu_gang *gang;
 101         struct kref *prof_priv_kref;
 102         void ( * prof_priv_release) (struct kref *kref);
 103
 104         /* owner thread */
 105         pid_t tid;
 106
 107         /* scheduler fields */
 108         struct list_head rq;
 109         unsigned int time_slice;
 110         unsigned long sched_flags;
 111         cpumask_t cpus_allowed;
 112         int policy;
 113         int prio;
 114         int last_ran;
 115
 116         /* statistics */
 117         struct {
 118                 /* updates protected by ctx->state_mutex */
 119                 enum spu_utilization_state util_state;
 120                 unsigned long long tstamp;      /* time of last state switch */
 121                 unsigned long long times[SPU_UTIL_MAX];
 122                 unsigned long long vol_ctx_switch;
 123                 unsigned long long invol_ctx_switch;
 124                 unsigned long long min_flt;
 125                 unsigned long long maj_flt;
 126                 unsigned long long hash_flt;
 127                 unsigned long long slb_flt;
 128                 unsigned long long slb_flt_base; /* # at last ctx switch */
 129                 unsigned long long class2_intr;
 130                 unsigned long long class2_intr_base; /* # at last ctx switch */
 131                 unsigned long long libassist;
 132         } stats;
 133
 134         /* context switch log */
 135         struct switch_log *switch_log;
 136
 137         struct list_head aff_list;
 138         int aff_head;
 139         int aff_offset;
 140 };
 141
 142 struct spu_gang {
 143         struct list_head list;
 144         struct mutex mutex;
 145         struct kref kref;
 146         int contexts;
 147
 148         struct spu_context *aff_ref_ctx;
 149         struct list_head aff_list_head;
 150         struct mutex aff_mutex;
 151         int aff_flags;
 152         struct spu *aff_ref_spu;
 153         atomic_t aff_sched_count;
 154 };
 155
 156 /* Flag bits for spu_gang aff_flags */
 157 #define AFF_OFFSETS_SET         1
 158 #define AFF_MERGED              2
 159
 160 struct mfc_dma_command {
 161         int32_t pad;    /* reserved */
 162         uint32_t lsa;   /* local storage address */
 163         uint64_t ea;    /* effective address */
 164         uint16_t size;  /* transfer size */
 165         uint16_t tag;   /* command tag */
 166         uint16_t class; /* class ID */
 167         uint16_t cmd;   /* command opcode */
 168 };
 169
 170
 171 /* SPU context query/set operations. */
 172 struct spu_context_ops {
 173         int (*mbox_read) (struct spu_context * ctx, u32 * data);
 174          u32(*mbox_stat_read) (struct spu_context * ctx);
 175         __poll_t (*mbox_stat_poll)(struct spu_context *ctx, __poll_t events);
 176         int (*ibox_read) (struct spu_context * ctx, u32 * data);
 177         int (*wbox_write) (struct spu_context * ctx, u32 data);
 178          u32(*signal1_read) (struct spu_context * ctx);
 179         void (*signal1_write) (struct spu_context * ctx, u32 data);
 180          u32(*signal2_read) (struct spu_context * ctx);
 181         void (*signal2_write) (struct spu_context * ctx, u32 data);
 182         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
 183          u64(*signal1_type_get) (struct spu_context * ctx);
 184         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
 185          u64(*signal2_type_get) (struct spu_context * ctx);
 186          u32(*npc_read) (struct spu_context * ctx);
 187         void (*npc_write) (struct spu_context * ctx, u32 data);
 188          u32(*status_read) (struct spu_context * ctx);
 189         char*(*get_ls) (struct spu_context * ctx);
 190         void (*privcntl_write) (struct spu_context *ctx, u64 data);
 191          u32 (*runcntl_read) (struct spu_context * ctx);
 192         void (*runcntl_write) (struct spu_context * ctx, u32 data);
 193         void (*runcntl_stop) (struct spu_context * ctx);
 194         void (*master_start) (struct spu_context * ctx);
 195         void (*master_stop) (struct spu_context * ctx);
 196         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
 197         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
 198         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
 199         int (*send_mfc_command)(struct spu_context * ctx,
 200                                 struct mfc_dma_command * cmd);
 201         void (*dma_info_read) (struct spu_context * ctx,
 202                                struct spu_dma_info * info);
 203         void (*proxydma_info_read) (struct spu_context * ctx,
 204                                     struct spu_proxydma_info * info);
 205         void (*restart_dma)(struct spu_context *ctx);
 206 };
 207
 208 extern struct spu_context_ops spu_hw_ops;
 209 extern struct spu_context_ops spu_backing_ops;
 210
 211 struct spufs_inode_info {
 212         struct spu_context *i_ctx;
 213         struct spu_gang *i_gang;
 214         struct inode vfs_inode;
 215         int i_openers;
 216 };
 217 #define SPUFS_I(inode) \
 218         container_of(inode, struct spufs_inode_info, vfs_inode)
 219
 220 struct spufs_tree_descr {
 221         const char *name;
 222         const struct file_operations *ops;
 223         umode_t mode;
 224         size_t size;
 225 };
 226
 227 extern const struct spufs_tree_descr spufs_dir_contents[];
 228 extern const struct spufs_tree_descr spufs_dir_nosched_contents[];
 229 extern const struct spufs_tree_descr spufs_dir_debug_contents[];
 230
 231 /* system call implementation */
 232 extern struct spufs_calls spufs_calls;
 233 struct coredump_params;
 234 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
 235 long spufs_create(struct path *nd, struct dentry *dentry, unsigned int flags,
 236                         umode_t mode, struct file *filp);
 237 /* ELF coredump callbacks for writing SPU ELF notes */
 238 extern int spufs_coredump_extra_notes_size(void);
 239 extern int spufs_coredump_extra_notes_write(struct coredump_params *cprm);
 240
 241 extern const struct file_operations spufs_context_fops;
 242
 243 /* gang management */
 244 struct spu_gang *alloc_spu_gang(void);
 245 struct spu_gang *get_spu_gang(struct spu_gang *gang);
 246 int put_spu_gang(struct spu_gang *gang);
 247 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
 248 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
 249
 250 /* fault handling */
 251 int spufs_handle_class1(struct spu_context *ctx);
 252 int spufs_handle_class0(struct spu_context *ctx);
 253
 254 /* affinity */
 255 struct spu *affinity_check(struct spu_context *ctx);
 256
 257 /* context management */
 258 extern atomic_t nr_spu_contexts;
 259 static inline int __must_check spu_acquire(struct spu_context *ctx)
 260 {
 261         return mutex_lock_interruptible(&ctx->state_mutex);
 262 }
 263
 264 static inline void spu_release(struct spu_context *ctx)
 265 {
 266         mutex_unlock(&ctx->state_mutex);
 267 }
 268
 269 struct spu_context * alloc_spu_context(struct spu_gang *gang);
 270 void destroy_spu_context(struct kref *kref);
 271 struct spu_context * get_spu_context(struct spu_context *ctx);
 272 int put_spu_context(struct spu_context *ctx);
 273 void spu_unmap_mappings(struct spu_context *ctx);
 274
 275 void spu_forget(struct spu_context *ctx);
 276 int __must_check spu_acquire_saved(struct spu_context *ctx);
 277 void spu_release_saved(struct spu_context *ctx);
 278
 279 int spu_stopped(struct spu_context *ctx, u32 * stat);
 280 void spu_del_from_rq(struct spu_context *ctx);
 281 int spu_activate(struct spu_context *ctx, unsigned long flags);
 282 void spu_deactivate(struct spu_context *ctx);
 283 void spu_yield(struct spu_context *ctx);
 284 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
 285 void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
 286                 u32 type, u32 val);
 287 void spu_set_timeslice(struct spu_context *ctx);
 288 void spu_update_sched_info(struct spu_context *ctx);
 289 void __spu_update_sched_info(struct spu_context *ctx);
 290 int __init spu_sched_init(void);
 291 void spu_sched_exit(void);
 292
 293 extern char *isolated_loader;
 294
 295 /*
 296  * spufs_wait
 297  *      Same as wait_event_interruptible(), except that here
 298  *      we need to call spu_release(ctx) before sleeping, and
 299  *      then spu_acquire(ctx) when awoken.
 300  *
 301  *      Returns with state_mutex re-acquired when successful or
 302  *      with -ERESTARTSYS and the state_mutex dropped when interrupted.
 303  */
 304
 305 #define spufs_wait(wq, condition)                                       \
 306 ({                                                                      \
 307         int __ret = 0;                                                  \
 308         DEFINE_WAIT(__wait);                                            \
 309         for (;;) {                                                      \
 310                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
 311                 if (condition)                                          \
 312                         break;                                          \
 313                 spu_release(ctx);                                       \
 314                 if (signal_pending(current)) {                          \
 315                         __ret = -ERESTARTSYS;                           \
 316                         break;                                          \
 317                 }                                                       \
 318                 schedule();                                             \
 319                 __ret = spu_acquire(ctx);                               \
 320                 if (__ret)                                              \
 321                         break;                                          \
 322         }                                                               \
 323         finish_wait(&(wq), &__wait);                                    \
 324         __ret;                                                          \
 325 })
 326
 327 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 328 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 329
 330 /* irq callback funcs. */
 331 void spufs_ibox_callback(struct spu *spu);
 332 void spufs_wbox_callback(struct spu *spu);
 333 void spufs_stop_callback(struct spu *spu, int irq);
 334 void spufs_mfc_callback(struct spu *spu);
 335 void spufs_dma_callback(struct spu *spu, int type);
 336
 337 extern struct spu_coredump_calls spufs_coredump_calls;
 338 struct spufs_coredump_reader {
 339         char *name;
 340         ssize_t (*read)(struct spu_context *ctx,
 341                         char __user *buffer, size_t size, loff_t *pos);
 342         u64 (*get)(struct spu_context *ctx);
 343         size_t size;
 344 };
 345 extern const struct spufs_coredump_reader spufs_coredump_read[];
 346 extern int spufs_coredump_num_notes;
 347
 348 extern int spu_init_csa(struct spu_state *csa);
 349 extern void spu_fini_csa(struct spu_state *csa);
 350 extern int spu_save(struct spu_state *prev, struct spu *spu);
 351 extern int spu_restore(struct spu_state *new, struct spu *spu);
 352 extern int spu_switch(struct spu_state *prev, struct spu_state *new,
 353                       struct spu *spu);
 354 extern int spu_alloc_lscsa(struct spu_state *csa);
 355 extern void spu_free_lscsa(struct spu_state *csa);
 356
 357 extern void spuctx_switch_state(struct spu_context *ctx,
 358                 enum spu_utilization_state new_state);
 359
 360 #endif