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

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

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