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;
spu_acquire(struct spu_context * ctx)259 static inline int __must_check spu_acquire(struct spu_context *ctx)
260 {
261 return mutex_lock_interruptible(&ctx->state_mutex);
262 }
263
spu_release(struct spu_context * ctx)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
361