18 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,  in perf_mmap__init()  argument
21 	map->fd = -1;  in perf_mmap__init()
22 	map->overwrite = overwrite;  in perf_mmap__init()
23 	map->unmap_cb  = unmap_cb;  in perf_mmap__init()
24 	refcount_set(&map->refcnt, 0);  in perf_mmap__init()
26 		prev->next = map;  in perf_mmap__init()
29 size_t perf_mmap__mmap_len(struct perf_mmap *map)  in perf_mmap__mmap_len()  argument
31 	return map->mask + 1 + page_size;  in perf_mmap__mmap_len()
34 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,  in perf_mmap__mmap()  argument
37 	map->prev = 0;  in perf_mmap__mmap()
38 	map->mask = mp->mask;  in perf_mmap__mmap()
39 	map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,  in perf_mmap__mmap()
41 	if (map->base == MAP_FAILED) {  in perf_mmap__mmap()
42 		map->base = NULL;  in perf_mmap__mmap()
46 	map->fd  = fd;  in perf_mmap__mmap()
47 	map->cpu = cpu;  in perf_mmap__mmap()
51 void perf_mmap__munmap(struct perf_mmap *map)  in perf_mmap__munmap()  argument
53 	if (map && map->base != NULL) {  in perf_mmap__munmap()
54 		munmap(map->base, perf_mmap__mmap_len(map));  in perf_mmap__munmap()
55 		map->base = NULL;  in perf_mmap__munmap()
56 		map->fd = -1;  in perf_mmap__munmap()
57 		refcount_set(&map->refcnt, 0);  in perf_mmap__munmap()
59 	if (map && map->unmap_cb)  in perf_mmap__munmap()
60 		map->unmap_cb(map);  in perf_mmap__munmap()
63 void perf_mmap__get(struct perf_mmap *map)  in perf_mmap__get()  argument
65 	refcount_inc(&map->refcnt);  in perf_mmap__get()
68 void perf_mmap__put(struct perf_mmap *map)  in perf_mmap__put()  argument
70 	BUG_ON(map->base && refcount_read(&map->refcnt) == 0);  in perf_mmap__put()
72 	if (refcount_dec_and_test(&map->refcnt))  in perf_mmap__put()
73 		perf_mmap__munmap(map);  in perf_mmap__put()
81 u64 perf_mmap__read_head(struct perf_mmap *map)  in perf_mmap__read_head()  argument
83 	return ring_buffer_read_head(map->base);  in perf_mmap__read_head()
86 static bool perf_mmap__empty(struct perf_mmap *map)  in perf_mmap__empty()  argument
88 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__empty()
90 	return perf_mmap__read_head(map) == map->prev && !pc->aux_size;  in perf_mmap__empty()
93 void perf_mmap__consume(struct perf_mmap *map)  in perf_mmap__consume()  argument
95 	if (!map->overwrite) {  in perf_mmap__consume()
96 		u64 old = map->prev;  in perf_mmap__consume()
98 		perf_mmap__write_tail(map, old);  in perf_mmap__consume()
101 	if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))  in perf_mmap__consume()
102 		perf_mmap__put(map);  in perf_mmap__consume()
174 int perf_mmap__read_init(struct perf_mmap *map)  in perf_mmap__read_init()  argument
179 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_init()
182 	return __perf_mmap__read_init(map);  in perf_mmap__read_init()
188  * The last perf_mmap__read() will set tail to map->core.prev.
189  * Need to correct the map->core.prev to head which is the end of next read.
191 void perf_mmap__read_done(struct perf_mmap *map)  in perf_mmap__read_done()  argument
196 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_done()
199 	map->prev = perf_mmap__read_head(map);  in perf_mmap__read_done()
203 static union perf_event *perf_mmap__read(struct perf_mmap *map,  in perf_mmap__read()  argument
206 	unsigned char *data = map->base + page_size;  in perf_mmap__read()
213 		event = (union perf_event *)&data[*startp & map->mask];  in perf_mmap__read()
223 		if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {  in perf_mmap__read()
226 			void *dst = map->event_copy;  in perf_mmap__read()
229 				cpy = min(map->mask + 1 - (offset & map->mask), len);  in perf_mmap__read()
230 				memcpy(dst, &data[offset & map->mask], cpy);  in perf_mmap__read()
236 			event = (union perf_event *)map->event_copy;  in perf_mmap__read()
257 union perf_event *perf_mmap__read_event(struct perf_mmap *map)  in perf_mmap__read_event()  argument
264 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_event()
268 	if (!map->overwrite)  in perf_mmap__read_event()
269 		map->end = perf_mmap__read_head(map);  in perf_mmap__read_event()
271 	event = perf_mmap__read(map, &map->start, map->end);  in perf_mmap__read_event()
273 	if (!map->overwrite)  in perf_mmap__read_event()
274 		map->prev = map->start;  in perf_mmap__read_event()
302 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count)  in perf_mmap__read_self()  argument
304 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__read_self()