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         struct fasync_struct *ibox_fasync;
  75         struct fasync_struct *wbox_fasync;
  76         struct fasync_struct *mfc_fasync;
  77         u32 tagwait;
  78         struct spu_context_ops *ops;
  79         struct work_struct reap_work;
  80         unsigned long flags;
  81         unsigned long event_return;
  82
  83         struct list_head gang_list;
  84         struct spu_gang *gang;
  85         struct kref *prof_priv_kref;
  86         void ( * prof_priv_release) (struct kref *kref);
  87
  88         /* owner thread */
  89         pid_t tid;
  90
  91         /* scheduler fields */
  92         struct list_head rq;
  93         unsigned int time_slice;
  94         unsigned long sched_flags;
  95         cpumask_t cpus_allowed;
  96         int policy;
  97         int prio;
  98
  99         /* statistics */
 100         struct {
 101                 /* updates protected by ctx->state_mutex */
 102                 enum spu_utilization_state util_state;
 103                 unsigned long long tstamp;      /* time of last state switch */
 104                 unsigned long long times[SPU_UTIL_MAX];
 105                 unsigned long long vol_ctx_switch;
 106                 unsigned long long invol_ctx_switch;
 107                 unsigned long long min_flt;
 108                 unsigned long long maj_flt;
 109                 unsigned long long hash_flt;
 110                 unsigned long long slb_flt;
 111                 unsigned long long slb_flt_base; /* # at last ctx switch */
 112                 unsigned long long class2_intr;
 113                 unsigned long long class2_intr_base; /* # at last ctx switch */
 114                 unsigned long long libassist;
 115         } stats;
 116
 117         struct list_head aff_list;
 118         int aff_head;
 119         int aff_offset;
 120 };
 121
 122 struct spu_gang {
 123         struct list_head list;
 124         struct mutex mutex;
 125         struct kref kref;
 126         int contexts;
 127
 128         struct spu_context *aff_ref_ctx;
 129         struct list_head aff_list_head;
 130         struct mutex aff_mutex;
 131         int aff_flags;
 132         struct spu *aff_ref_spu;
 133         atomic_t aff_sched_count;
 134 };
 135
 136 /* Flag bits for spu_gang aff_flags */
 137 #define AFF_OFFSETS_SET         1
 138 #define AFF_MERGED              2
 139
 140 struct mfc_dma_command {
 141         int32_t pad;    /* reserved */
 142         uint32_t lsa;   /* local storage address */
 143         uint64_t ea;    /* effective address */
 144         uint16_t size;  /* transfer size */
 145         uint16_t tag;   /* command tag */
 146         uint16_t class; /* class ID */
 147         uint16_t cmd;   /* command opcode */
 148 };
 149
 150
 151 /* SPU context query/set operations. */
 152 struct spu_context_ops {
 153         int (*mbox_read) (struct spu_context * ctx, u32 * data);
 154          u32(*mbox_stat_read) (struct spu_context * ctx);
 155         unsigned int (*mbox_stat_poll)(struct spu_context *ctx,
 156                                         unsigned int events);
 157         int (*ibox_read) (struct spu_context * ctx, u32 * data);
 158         int (*wbox_write) (struct spu_context * ctx, u32 data);
 159          u32(*signal1_read) (struct spu_context * ctx);
 160         void (*signal1_write) (struct spu_context * ctx, u32 data);
 161          u32(*signal2_read) (struct spu_context * ctx);
 162         void (*signal2_write) (struct spu_context * ctx, u32 data);
 163         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
 164          u64(*signal1_type_get) (struct spu_context * ctx);
 165         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
 166          u64(*signal2_type_get) (struct spu_context * ctx);
 167          u32(*npc_read) (struct spu_context * ctx);
 168         void (*npc_write) (struct spu_context * ctx, u32 data);
 169          u32(*status_read) (struct spu_context * ctx);
 170         char*(*get_ls) (struct spu_context * ctx);
 171          u32 (*runcntl_read) (struct spu_context * ctx);
 172         void (*runcntl_write) (struct spu_context * ctx, u32 data);
 173         void (*master_start) (struct spu_context * ctx);
 174         void (*master_stop) (struct spu_context * ctx);
 175         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
 176         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
 177         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
 178         int (*send_mfc_command)(struct spu_context * ctx,
 179                                 struct mfc_dma_command * cmd);
 180         void (*dma_info_read) (struct spu_context * ctx,
 181                                struct spu_dma_info * info);
 182         void (*proxydma_info_read) (struct spu_context * ctx,
 183                                     struct spu_proxydma_info * info);
 184         void (*restart_dma)(struct spu_context *ctx);
 185 };
 186
 187 extern struct spu_context_ops spu_hw_ops;
 188 extern struct spu_context_ops spu_backing_ops;
 189
 190 struct spufs_inode_info {
 191         struct spu_context *i_ctx;
 192         struct spu_gang *i_gang;
 193         struct inode vfs_inode;
 194         int i_openers;
 195 };
 196 #define SPUFS_I(inode) \
 197         container_of(inode, struct spufs_inode_info, vfs_inode)
 198
 199 extern struct tree_descr spufs_dir_contents[];
 200 extern struct tree_descr spufs_dir_nosched_contents[];
 201
 202 /* system call implementation */
 203 extern struct spufs_calls spufs_calls;
 204 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
 205 long spufs_create(struct nameidata *nd, unsigned int flags,
 206                         mode_t mode, struct file *filp);
 207 extern const struct file_operations spufs_context_fops;
 208
 209 /* gang management */
 210 struct spu_gang *alloc_spu_gang(void);
 211 struct spu_gang *get_spu_gang(struct spu_gang *gang);
 212 int put_spu_gang(struct spu_gang *gang);
 213 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
 214 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
 215
 216 /* fault handling */
 217 int spufs_handle_class1(struct spu_context *ctx);
 218
 219 /* affinity */
 220 struct spu *affinity_check(struct spu_context *ctx);
 221
 222 /* context management */
 223 extern atomic_t nr_spu_contexts;
 224 static inline void spu_acquire(struct spu_context *ctx)
 225 {
 226         mutex_lock(&ctx->state_mutex);
 227 }
 228
 229 static inline void spu_release(struct spu_context *ctx)
 230 {
 231         mutex_unlock(&ctx->state_mutex);
 232 }
 233
 234 struct spu_context * alloc_spu_context(struct spu_gang *gang);
 235 void destroy_spu_context(struct kref *kref);
 236 struct spu_context * get_spu_context(struct spu_context *ctx);
 237 int put_spu_context(struct spu_context *ctx);
 238 void spu_unmap_mappings(struct spu_context *ctx);
 239
 240 void spu_forget(struct spu_context *ctx);
 241 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
 242 void spu_acquire_saved(struct spu_context *ctx);
 243 void spu_release_saved(struct spu_context *ctx);
 244
 245 int spu_activate(struct spu_context *ctx, unsigned long flags);
 246 void spu_deactivate(struct spu_context *ctx);
 247 void spu_yield(struct spu_context *ctx);
 248 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
 249 void spu_set_timeslice(struct spu_context *ctx);
 250 void spu_update_sched_info(struct spu_context *ctx);
 251 void __spu_update_sched_info(struct spu_context *ctx);
 252 int __init spu_sched_init(void);
 253 void spu_sched_exit(void);
 254
 255 extern char *isolated_loader;
 256
 257 /*
 258  * spufs_wait
 259  *      Same as wait_event_interruptible(), except that here
 260  *      we need to call spu_release(ctx) before sleeping, and
 261  *      then spu_acquire(ctx) when awoken.
 262  */
 263
 264 #define spufs_wait(wq, condition)                                       \
 265 ({                                                                      \
 266         int __ret = 0;                                                  \
 267         DEFINE_WAIT(__wait);                                            \
 268         for (;;) {                                                      \
 269                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
 270                 if (condition)                                          \
 271                         break;                                          \
 272                 if (signal_pending(current)) {                          \
 273                         __ret = -ERESTARTSYS;                           \
 274                         break;                                          \
 275                 }                                                       \
 276                 spu_release(ctx);                                       \
 277                 schedule();                                             \
 278                 spu_acquire(ctx);                                       \
 279         }                                                               \
 280         finish_wait(&(wq), &__wait);                                    \
 281         __ret;                                                          \
 282 })
 283
 284 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
 285 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
 286
 287 /* irq callback funcs. */
 288 void spufs_ibox_callback(struct spu *spu);
 289 void spufs_wbox_callback(struct spu *spu);
 290 void spufs_stop_callback(struct spu *spu);
 291 void spufs_mfc_callback(struct spu *spu);
 292 void spufs_dma_callback(struct spu *spu, int type);
 293
 294 extern struct spu_coredump_calls spufs_coredump_calls;
 295 struct spufs_coredump_reader {
 296         char *name;
 297         ssize_t (*read)(struct spu_context *ctx,
 298                         char __user *buffer, size_t size, loff_t *pos);
 299         u64 (*get)(struct spu_context *ctx);
 300         size_t size;
 301 };
 302 extern struct spufs_coredump_reader spufs_coredump_read[];
 303 extern int spufs_coredump_num_notes;
 304
 305 /*
 306  * This function is a little bit too large for an inline, but
 307  * as fault.c is built into the kernel we can't move it out of
 308  * line.
 309  */
 310 static inline void spuctx_switch_state(struct spu_context *ctx,
 311                 enum spu_utilization_state new_state)
 312 {
 313         unsigned long long curtime;
 314         signed long long delta;
 315         struct timespec ts;
 316         struct spu *spu;
 317         enum spu_utilization_state old_state;
 318
 319         ktime_get_ts(&ts);
 320         curtime = timespec_to_ns(&ts);
 321         delta = curtime - ctx->stats.tstamp;
 322
 323         WARN_ON(!mutex_is_locked(&ctx->state_mutex));
 324         WARN_ON(delta < 0);
 325
 326         spu = ctx->spu;
 327         old_state = ctx->stats.util_state;
 328         ctx->stats.util_state = new_state;
 329         ctx->stats.tstamp = curtime;
 330
 331         /*
 332          * Update the physical SPU utilization statistics.
 333          */
 334         if (spu) {
 335                 ctx->stats.times[old_state] += delta;
 336                 spu->stats.times[old_state] += delta;
 337                 spu->stats.util_state = new_state;
 338                 spu->stats.tstamp = curtime;
 339         }
 340 }
 341
 342 #endif