19 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,  in perf_mmap__init()  argument
23 	map->fd = -1;  in perf_mmap__init()
24 	map->overwrite = overwrite;  in perf_mmap__init()
25 	map->unmap_cb  = unmap_cb;  in perf_mmap__init()
26 	refcount_set(&map->refcnt, 0);  in perf_mmap__init()
28 		prev->next = map;  in perf_mmap__init()
31 size_t perf_mmap__mmap_len(struct perf_mmap *map)  in perf_mmap__mmap_len()  argument
33 	return map->mask + 1 + page_size;  in perf_mmap__mmap_len()
36 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,  in perf_mmap__mmap()  argument
39 	map->prev = 0;  in perf_mmap__mmap()
40 	map->mask = mp->mask;  in perf_mmap__mmap()
41 	map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,  in perf_mmap__mmap()
43 	if (map->base == MAP_FAILED) {  in perf_mmap__mmap()
44 		map->base = NULL;  in perf_mmap__mmap()
48 	map->fd  = fd;  in perf_mmap__mmap()
49 	map->cpu = cpu;  in perf_mmap__mmap()
53 void perf_mmap__munmap(struct perf_mmap *map)  in perf_mmap__munmap()  argument
55 	if (!map)  in perf_mmap__munmap()
58 	zfree(&map->event_copy);  in perf_mmap__munmap()
59 	map->event_copy_sz = 0;  in perf_mmap__munmap()
60 	if (map->base) {  in perf_mmap__munmap()
61 		munmap(map->base, perf_mmap__mmap_len(map));  in perf_mmap__munmap()
62 		map->base = NULL;  in perf_mmap__munmap()
63 		map->fd = -1;  in perf_mmap__munmap()
64 		refcount_set(&map->refcnt, 0);  in perf_mmap__munmap()
66 	if (map->unmap_cb)  in perf_mmap__munmap()
67 		map->unmap_cb(map);  in perf_mmap__munmap()
70 void perf_mmap__get(struct perf_mmap *map)  in perf_mmap__get()  argument
72 	refcount_inc(&map->refcnt);  in perf_mmap__get()
75 void perf_mmap__put(struct perf_mmap *map)  in perf_mmap__put()  argument
77 	BUG_ON(map->base && refcount_read(&map->refcnt) == 0);  in perf_mmap__put()
79 	if (refcount_dec_and_test(&map->refcnt))  in perf_mmap__put()
80 		perf_mmap__munmap(map);  in perf_mmap__put()
88 u64 perf_mmap__read_head(struct perf_mmap *map)  in perf_mmap__read_head()  argument
90 	return ring_buffer_read_head(map->base);  in perf_mmap__read_head()
93 static bool perf_mmap__empty(struct perf_mmap *map)  in perf_mmap__empty()  argument
95 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__empty()
97 	return perf_mmap__read_head(map) == map->prev && !pc->aux_size;  in perf_mmap__empty()
100 void perf_mmap__consume(struct perf_mmap *map)  in perf_mmap__consume()  argument
102 	if (!map->overwrite) {  in perf_mmap__consume()
103 		u64 old = map->prev;  in perf_mmap__consume()
105 		perf_mmap__write_tail(map, old);  in perf_mmap__consume()
108 	if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))  in perf_mmap__consume()
109 		perf_mmap__put(map);  in perf_mmap__consume()
181 int perf_mmap__read_init(struct perf_mmap *map)  in perf_mmap__read_init()  argument
186 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_init()
189 	return __perf_mmap__read_init(map);  in perf_mmap__read_init()
198 void perf_mmap__read_done(struct perf_mmap *map)  in perf_mmap__read_done()  argument
203 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_done()
206 	map->prev = perf_mmap__read_head(map);  in perf_mmap__read_done()
210 static union perf_event *perf_mmap__read(struct perf_mmap *map,  in perf_mmap__read()  argument
213 	unsigned char *data = map->base + page_size;  in perf_mmap__read()
220 		event = (union perf_event *)&data[*startp & map->mask];  in perf_mmap__read()
230 		if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {  in perf_mmap__read()
233 			void *dst = map->event_copy;  in perf_mmap__read()
235 			if (size > map->event_copy_sz) {  in perf_mmap__read()
236 				dst = realloc(map->event_copy, size);  in perf_mmap__read()
239 				map->event_copy = dst;  in perf_mmap__read()
240 				map->event_copy_sz = size;  in perf_mmap__read()
244 				cpy = min(map->mask + 1 - (offset & map->mask), len);  in perf_mmap__read()
245 				memcpy(dst, &data[offset & map->mask], cpy);  in perf_mmap__read()
251 			event = (union perf_event *)map->event_copy;  in perf_mmap__read()
272 union perf_event *perf_mmap__read_event(struct perf_mmap *map)  in perf_mmap__read_event()  argument
279 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_event()
283 	if (!map->overwrite)  in perf_mmap__read_event()
284 		map->end = perf_mmap__read_head(map);  in perf_mmap__read_event()
286 	event = perf_mmap__read(map, &map->start, map->end);  in perf_mmap__read_event()
288 	if (!map->overwrite)  in perf_mmap__read_event()
289 		map->prev = map->start;  in perf_mmap__read_event()
480 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count)  in perf_mmap__read_self()  argument
482 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__read_self()