16 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,  in perf_mmap__init()  argument
19 	map->fd = -1;  in perf_mmap__init()
20 	map->overwrite = overwrite;  in perf_mmap__init()
21 	map->unmap_cb  = unmap_cb;  in perf_mmap__init()
22 	refcount_set(&map->refcnt, 0);  in perf_mmap__init()
24 		prev->next = map;  in perf_mmap__init()
27 size_t perf_mmap__mmap_len(struct perf_mmap *map)  in perf_mmap__mmap_len()  argument
29 	return map->mask + 1 + page_size;  in perf_mmap__mmap_len()
32 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,  in perf_mmap__mmap()  argument
35 	map->prev = 0;  in perf_mmap__mmap()
36 	map->mask = mp->mask;  in perf_mmap__mmap()
37 	map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,  in perf_mmap__mmap()
39 	if (map->base == MAP_FAILED) {  in perf_mmap__mmap()
40 		map->base = NULL;  in perf_mmap__mmap()
44 	map->fd  = fd;  in perf_mmap__mmap()
45 	map->cpu = cpu;  in perf_mmap__mmap()
49 void perf_mmap__munmap(struct perf_mmap *map)  in perf_mmap__munmap()  argument
51 	if (map && map->base != NULL) {  in perf_mmap__munmap()
52 		munmap(map->base, perf_mmap__mmap_len(map));  in perf_mmap__munmap()
53 		map->base = NULL;  in perf_mmap__munmap()
54 		map->fd = -1;  in perf_mmap__munmap()
55 		refcount_set(&map->refcnt, 0);  in perf_mmap__munmap()
57 	if (map && map->unmap_cb)  in perf_mmap__munmap()
58 		map->unmap_cb(map);  in perf_mmap__munmap()
61 void perf_mmap__get(struct perf_mmap *map)  in perf_mmap__get()  argument
63 	refcount_inc(&map->refcnt);  in perf_mmap__get()
66 void perf_mmap__put(struct perf_mmap *map)  in perf_mmap__put()  argument
68 	BUG_ON(map->base && refcount_read(&map->refcnt) == 0);  in perf_mmap__put()
70 	if (refcount_dec_and_test(&map->refcnt))  in perf_mmap__put()
71 		perf_mmap__munmap(map);  in perf_mmap__put()
79 u64 perf_mmap__read_head(struct perf_mmap *map)  in perf_mmap__read_head()  argument
81 	return ring_buffer_read_head(map->base);  in perf_mmap__read_head()
84 static bool perf_mmap__empty(struct perf_mmap *map)  in perf_mmap__empty()  argument
86 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__empty()
88 	return perf_mmap__read_head(map) == map->prev && !pc->aux_size;  in perf_mmap__empty()
91 void perf_mmap__consume(struct perf_mmap *map)  in perf_mmap__consume()  argument
93 	if (!map->overwrite) {  in perf_mmap__consume()
94 		u64 old = map->prev;  in perf_mmap__consume()
96 		perf_mmap__write_tail(map, old);  in perf_mmap__consume()
99 	if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))  in perf_mmap__consume()
100 		perf_mmap__put(map);  in perf_mmap__consume()
172 int perf_mmap__read_init(struct perf_mmap *map)  in perf_mmap__read_init()  argument
177 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_init()
180 	return __perf_mmap__read_init(map);  in perf_mmap__read_init()
189 void perf_mmap__read_done(struct perf_mmap *map)  in perf_mmap__read_done()  argument
194 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_done()
197 	map->prev = perf_mmap__read_head(map);  in perf_mmap__read_done()
201 static union perf_event *perf_mmap__read(struct perf_mmap *map,  in perf_mmap__read()  argument
204 	unsigned char *data = map->base + page_size;  in perf_mmap__read()
211 		event = (union perf_event *)&data[*startp & map->mask];  in perf_mmap__read()
221 		if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {  in perf_mmap__read()
224 			void *dst = map->event_copy;  in perf_mmap__read()
227 				cpy = min(map->mask + 1 - (offset & map->mask), len);  in perf_mmap__read()
228 				memcpy(dst, &data[offset & map->mask], cpy);  in perf_mmap__read()
234 			event = (union perf_event *)map->event_copy;  in perf_mmap__read()
255 union perf_event *perf_mmap__read_event(struct perf_mmap *map)  in perf_mmap__read_event()  argument
262 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_event()
266 	if (!map->overwrite)  in perf_mmap__read_event()
267 		map->end = perf_mmap__read_head(map);  in perf_mmap__read_event()
269 	event = perf_mmap__read(map, &map->start, map->end);  in perf_mmap__read_event()
271 	if (!map->overwrite)  in perf_mmap__read_event()
272 		map->prev = map->start;  in perf_mmap__read_event()