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 GNU Debugger */ 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(const 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_log_notify(struct spu *spu, struct spu_context *ctx, 285 u32 type, u32 val); 286 void spu_set_timeslice(struct spu_context *ctx); 287 void spu_update_sched_info(struct spu_context *ctx); 288 void __spu_update_sched_info(struct spu_context *ctx); 289 int __init spu_sched_init(void); 290 void spu_sched_exit(void); 291 292 extern char *isolated_loader; 293 294 /* 295 * spufs_wait 296 * Same as wait_event_interruptible(), except that here 297 * we need to call spu_release(ctx) before sleeping, and 298 * then spu_acquire(ctx) when awoken. 299 * 300 * Returns with state_mutex re-acquired when successful or 301 * with -ERESTARTSYS and the state_mutex dropped when interrupted. 302 */ 303 304 #define spufs_wait(wq, condition) \ 305 ({ \ 306 int __ret = 0; \ 307 DEFINE_WAIT(__wait); \ 308 for (;;) { \ 309 prepare_to_wait(&(wq), &__wait, TASK_INTERRUPTIBLE); \ 310 if (condition) \ 311 break; \ 312 spu_release(ctx); \ 313 if (signal_pending(current)) { \ 314 __ret = -ERESTARTSYS; \ 315 break; \ 316 } \ 317 schedule(); \ 318 __ret = spu_acquire(ctx); \ 319 if (__ret) \ 320 break; \ 321 } \ 322 finish_wait(&(wq), &__wait); \ 323 __ret; \ 324 }) 325 326 size_t spu_wbox_write(struct spu_context *ctx, u32 data); 327 size_t spu_ibox_read(struct spu_context *ctx, u32 *data); 328 329 /* irq callback funcs. */ 330 void spufs_ibox_callback(struct spu *spu); 331 void spufs_wbox_callback(struct spu *spu); 332 void spufs_stop_callback(struct spu *spu, int irq); 333 void spufs_mfc_callback(struct spu *spu); 334 void spufs_dma_callback(struct spu *spu, int type); 335 336 struct spufs_coredump_reader { 337 char *name; 338 ssize_t (*dump)(struct spu_context *ctx, struct coredump_params *cprm); 339 u64 (*get)(struct spu_context *ctx); 340 size_t size; 341 }; 342 extern const struct spufs_coredump_reader spufs_coredump_read[]; 343 344 extern int spu_init_csa(struct spu_state *csa); 345 extern void spu_fini_csa(struct spu_state *csa); 346 extern int spu_save(struct spu_state *prev, struct spu *spu); 347 extern int spu_restore(struct spu_state *new, struct spu *spu); 348 extern int spu_switch(struct spu_state *prev, struct spu_state *new, 349 struct spu *spu); 350 extern int spu_alloc_lscsa(struct spu_state *csa); 351 extern void spu_free_lscsa(struct spu_state *csa); 352 353 extern void spuctx_switch_state(struct spu_context *ctx, 354 enum spu_utilization_state new_state); 355 356 #endif 357