19 void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev,  in perf_mmap__init()  argument
22 	map->fd = -1;  in perf_mmap__init()
23 	map->overwrite = overwrite;  in perf_mmap__init()
24 	map->unmap_cb  = unmap_cb;  in perf_mmap__init()
25 	refcount_set(&map->refcnt, 0);  in perf_mmap__init()
27 		prev->next = map;  in perf_mmap__init()
30 size_t perf_mmap__mmap_len(struct perf_mmap *map)  in perf_mmap__mmap_len()  argument
32 	return map->mask + 1 + page_size;  in perf_mmap__mmap_len()
35 int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp,  in perf_mmap__mmap()  argument
38 	map->prev = 0;  in perf_mmap__mmap()
39 	map->mask = mp->mask;  in perf_mmap__mmap()
40 	map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,  in perf_mmap__mmap()
42 	if (map->base == MAP_FAILED) {  in perf_mmap__mmap()
43 		map->base = NULL;  in perf_mmap__mmap()
47 	map->fd  = fd;  in perf_mmap__mmap()
48 	map->cpu = cpu;  in perf_mmap__mmap()
52 void perf_mmap__munmap(struct perf_mmap *map)  in perf_mmap__munmap()  argument
54 	if (map && map->base != NULL) {  in perf_mmap__munmap()
55 		munmap(map->base, perf_mmap__mmap_len(map));  in perf_mmap__munmap()
56 		map->base = NULL;  in perf_mmap__munmap()
57 		map->fd = -1;  in perf_mmap__munmap()
58 		refcount_set(&map->refcnt, 0);  in perf_mmap__munmap()
60 	if (map && map->unmap_cb)  in perf_mmap__munmap()
61 		map->unmap_cb(map);  in perf_mmap__munmap()
64 void perf_mmap__get(struct perf_mmap *map)  in perf_mmap__get()  argument
66 	refcount_inc(&map->refcnt);  in perf_mmap__get()
69 void perf_mmap__put(struct perf_mmap *map)  in perf_mmap__put()  argument
71 	BUG_ON(map->base && refcount_read(&map->refcnt) == 0);  in perf_mmap__put()
73 	if (refcount_dec_and_test(&map->refcnt))  in perf_mmap__put()
74 		perf_mmap__munmap(map);  in perf_mmap__put()
82 u64 perf_mmap__read_head(struct perf_mmap *map)  in perf_mmap__read_head()  argument
84 	return ring_buffer_read_head(map->base);  in perf_mmap__read_head()
87 static bool perf_mmap__empty(struct perf_mmap *map)  in perf_mmap__empty()  argument
89 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__empty()
91 	return perf_mmap__read_head(map) == map->prev && !pc->aux_size;  in perf_mmap__empty()
94 void perf_mmap__consume(struct perf_mmap *map)  in perf_mmap__consume()  argument
96 	if (!map->overwrite) {  in perf_mmap__consume()
97 		u64 old = map->prev;  in perf_mmap__consume()
99 		perf_mmap__write_tail(map, old);  in perf_mmap__consume()
102 	if (refcount_read(&map->refcnt) == 1 && perf_mmap__empty(map))  in perf_mmap__consume()
103 		perf_mmap__put(map);  in perf_mmap__consume()
175 int perf_mmap__read_init(struct perf_mmap *map)  in perf_mmap__read_init()  argument
180 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_init()
183 	return __perf_mmap__read_init(map);  in perf_mmap__read_init()
189  * The last perf_mmap__read() will set tail to map->core.prev.
190  * Need to correct the map->core.prev to head which is the end of next read.
192 void perf_mmap__read_done(struct perf_mmap *map)  in perf_mmap__read_done()  argument
197 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_done()
200 	map->prev = perf_mmap__read_head(map);  in perf_mmap__read_done()
204 static union perf_event *perf_mmap__read(struct perf_mmap *map,  in perf_mmap__read()  argument
207 	unsigned char *data = map->base + page_size;  in perf_mmap__read()
214 		event = (union perf_event *)&data[*startp & map->mask];  in perf_mmap__read()
224 		if ((*startp & map->mask) + size != ((*startp + size) & map->mask)) {  in perf_mmap__read()
227 			void *dst = map->event_copy;  in perf_mmap__read()
230 				cpy = min(map->mask + 1 - (offset & map->mask), len);  in perf_mmap__read()
231 				memcpy(dst, &data[offset & map->mask], cpy);  in perf_mmap__read()
237 			event = (union perf_event *)map->event_copy;  in perf_mmap__read()
258 union perf_event *perf_mmap__read_event(struct perf_mmap *map)  in perf_mmap__read_event()  argument
265 	if (!refcount_read(&map->refcnt))  in perf_mmap__read_event()
269 	if (!map->overwrite)  in perf_mmap__read_event()
270 		map->end = perf_mmap__read_head(map);  in perf_mmap__read_event()
272 	event = perf_mmap__read(map, &map->start, map->end);  in perf_mmap__read_event()
274 	if (!map->overwrite)  in perf_mmap__read_event()
275 		map->prev = map->start;  in perf_mmap__read_event()
400 int perf_mmap__read_self(struct perf_mmap *map, struct perf_counts_values *count)  in perf_mmap__read_self()  argument
402 	struct perf_event_mmap_page *pc = map->base;  in perf_mmap__read_self()