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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 #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 timespec64 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         __poll_t (*mbox_stat_poll)(struct spu_context *ctx, __poll_t events);
189         int (*ibox_read) (struct spu_context * ctx, u32 * data);
190         int (*wbox_write) (struct spu_context * ctx, u32 data);
191          u32(*signal1_read) (struct spu_context * ctx);
192         void (*signal1_write) (struct spu_context * ctx, u32 data);
193          u32(*signal2_read) (struct spu_context * ctx);
194         void (*signal2_write) (struct spu_context * ctx, u32 data);
195         void (*signal1_type_set) (struct spu_context * ctx, u64 val);
196          u64(*signal1_type_get) (struct spu_context * ctx);
197         void (*signal2_type_set) (struct spu_context * ctx, u64 val);
198          u64(*signal2_type_get) (struct spu_context * ctx);
199          u32(*npc_read) (struct spu_context * ctx);
200         void (*npc_write) (struct spu_context * ctx, u32 data);
201          u32(*status_read) (struct spu_context * ctx);
202         char*(*get_ls) (struct spu_context * ctx);
203         void (*privcntl_write) (struct spu_context *ctx, u64 data);
204          u32 (*runcntl_read) (struct spu_context * ctx);
205         void (*runcntl_write) (struct spu_context * ctx, u32 data);
206         void (*runcntl_stop) (struct spu_context * ctx);
207         void (*master_start) (struct spu_context * ctx);
208         void (*master_stop) (struct spu_context * ctx);
209         int (*set_mfc_query)(struct spu_context * ctx, u32 mask, u32 mode);
210         u32 (*read_mfc_tagstatus)(struct spu_context * ctx);
211         u32 (*get_mfc_free_elements)(struct spu_context *ctx);
212         int (*send_mfc_command)(struct spu_context * ctx,
213                                 struct mfc_dma_command * cmd);
214         void (*dma_info_read) (struct spu_context * ctx,
215                                struct spu_dma_info * info);
216         void (*proxydma_info_read) (struct spu_context * ctx,
217                                     struct spu_proxydma_info * info);
218         void (*restart_dma)(struct spu_context *ctx);
219 };
220 
221 extern struct spu_context_ops spu_hw_ops;
222 extern struct spu_context_ops spu_backing_ops;
223 
224 struct spufs_inode_info {
225         struct spu_context *i_ctx;
226         struct spu_gang *i_gang;
227         struct inode vfs_inode;
228         int i_openers;
229 };
230 #define SPUFS_I(inode) \
231         container_of(inode, struct spufs_inode_info, vfs_inode)
232 
233 struct spufs_tree_descr {
234         const char *name;
235         const struct file_operations *ops;
236         umode_t mode;
237         size_t size;
238 };
239 
240 extern const struct spufs_tree_descr spufs_dir_contents[];
241 extern const struct spufs_tree_descr spufs_dir_nosched_contents[];
242 extern const struct spufs_tree_descr spufs_dir_debug_contents[];
243 
244 /* system call implementation */
245 extern struct spufs_calls spufs_calls;
246 struct coredump_params;
247 long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *status);
248 long spufs_create(struct path *nd, struct dentry *dentry, unsigned int flags,
249                         umode_t mode, struct file *filp);
250 /* ELF coredump callbacks for writing SPU ELF notes */
251 extern int spufs_coredump_extra_notes_size(void);
252 extern int spufs_coredump_extra_notes_write(struct coredump_params *cprm);
253 
254 extern const struct file_operations spufs_context_fops;
255 
256 /* gang management */
257 struct spu_gang *alloc_spu_gang(void);
258 struct spu_gang *get_spu_gang(struct spu_gang *gang);
259 int put_spu_gang(struct spu_gang *gang);
260 void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx);
261 void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx);
262 
263 /* fault handling */
264 int spufs_handle_class1(struct spu_context *ctx);
265 int spufs_handle_class0(struct spu_context *ctx);
266 
267 /* affinity */
268 struct spu *affinity_check(struct spu_context *ctx);
269 
270 /* context management */
271 extern atomic_t nr_spu_contexts;
272 static inline int __must_check spu_acquire(struct spu_context *ctx)
273 {
274         return mutex_lock_interruptible(&ctx->state_mutex);
275 }
276 
277 static inline void spu_release(struct spu_context *ctx)
278 {
279         mutex_unlock(&ctx->state_mutex);
280 }
281 
282 struct spu_context * alloc_spu_context(struct spu_gang *gang);
283 void destroy_spu_context(struct kref *kref);
284 struct spu_context * get_spu_context(struct spu_context *ctx);
285 int put_spu_context(struct spu_context *ctx);
286 void spu_unmap_mappings(struct spu_context *ctx);
287 
288 void spu_forget(struct spu_context *ctx);
289 int __must_check spu_acquire_saved(struct spu_context *ctx);
290 void spu_release_saved(struct spu_context *ctx);
291 
292 int spu_stopped(struct spu_context *ctx, u32 * stat);
293 void spu_del_from_rq(struct spu_context *ctx);
294 int spu_activate(struct spu_context *ctx, unsigned long flags);
295 void spu_deactivate(struct spu_context *ctx);
296 void spu_yield(struct spu_context *ctx);
297 void spu_switch_notify(struct spu *spu, struct spu_context *ctx);
298 void spu_switch_log_notify(struct spu *spu, struct spu_context *ctx,
299                 u32 type, u32 val);
300 void spu_set_timeslice(struct spu_context *ctx);
301 void spu_update_sched_info(struct spu_context *ctx);
302 void __spu_update_sched_info(struct spu_context *ctx);
303 int __init spu_sched_init(void);
304 void spu_sched_exit(void);
305 
306 extern char *isolated_loader;
307 
308 /*
309  * spufs_wait
310  *      Same as wait_event_interruptible(), except that here
311  *      we need to call spu_release(ctx) before sleeping, and
312  *      then spu_acquire(ctx) when awoken.
313  *
314  *      Returns with state_mutex re-acquired when successful or
315  *      with -ERESTARTSYS and the state_mutex dropped when interrupted.
316  */
317 
318 #define spufs_wait(wq, condition)                                       \
319 ({                                                                      \
320         int __ret = 0;                                                  \
321         DEFINE_WAIT(__wait);                                            \
322         for (;;) {                                                      \
323                 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE);    \
324                 if (condition)                                          \
325                         break;                                          \
326                 spu_release(ctx);                                       \
327                 if (signal_pending(current)) {                          \
328                         __ret = -ERESTARTSYS;                           \
329                         break;                                          \
330                 }                                                       \
331                 schedule();                                             \
332                 __ret = spu_acquire(ctx);                               \
333                 if (__ret)                                              \
334                         break;                                          \
335         }                                                               \
336         finish_wait(&(wq), &__wait);                                    \
337         __ret;                                                          \
338 })
339 
340 size_t spu_wbox_write(struct spu_context *ctx, u32 data);
341 size_t spu_ibox_read(struct spu_context *ctx, u32 *data);
342 
343 /* irq callback funcs. */
344 void spufs_ibox_callback(struct spu *spu);
345 void spufs_wbox_callback(struct spu *spu);
346 void spufs_stop_callback(struct spu *spu, int irq);
347 void spufs_mfc_callback(struct spu *spu);
348 void spufs_dma_callback(struct spu *spu, int type);
349 
350 extern struct spu_coredump_calls spufs_coredump_calls;
351 struct spufs_coredump_reader {
352         char *name;
353         ssize_t (*read)(struct spu_context *ctx,
354                         char __user *buffer, size_t size, loff_t *pos);
355         u64 (*get)(struct spu_context *ctx);
356         size_t size;
357 };
358 extern const struct spufs_coredump_reader spufs_coredump_read[];
359 extern int spufs_coredump_num_notes;
360 
361 extern int spu_init_csa(struct spu_state *csa);
362 extern void spu_fini_csa(struct spu_state *csa);
363 extern int spu_save(struct spu_state *prev, struct spu *spu);
364 extern int spu_restore(struct spu_state *new, struct spu *spu);
365 extern int spu_switch(struct spu_state *prev, struct spu_state *new,
366                       struct spu *spu);
367 extern int spu_alloc_lscsa(struct spu_state *csa);
368 extern void spu_free_lscsa(struct spu_state *csa);
369 
370 extern void spuctx_switch_state(struct spu_context *ctx,
371                 enum spu_utilization_state new_state);
372 
373 #endif
374 

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