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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_RING_BUFFER_H#define _LINUX_RING_BUFFER_H
#include <linux/mm.h>#include <linux/seq_file.h>#include <linux/poll.h>
#include <uapi/linux/trace_mmap.h>
struct trace_buffer;struct ring_buffer_iter;
/* * Don't refer to this struct directly, use functions below. */struct ring_buffer_event { u32 type_len:5, time_delta:27;
u32 array[];};
/** * enum ring_buffer_type - internal ring buffer types * * @RINGBUF_TYPE_PADDING: Left over page padding or discarded event * If time_delta is 0: * array is ignored * size is variable depending on how much * padding is needed * If time_delta is non zero: * array[0] holds the actual length * size = 4 + length (bytes) * * @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta * array[0] = time delta (28 .. 59) * size = 8 bytes * * @RINGBUF_TYPE_TIME_STAMP: Absolute timestamp * Same format as TIME_EXTEND except that the * value is an absolute timestamp, not a delta * event.time_delta contains bottom 27 bits * array[0] = top (28 .. 59) bits * size = 8 bytes * * <= @RINGBUF_TYPE_DATA_TYPE_LEN_MAX: * Data record * If type_len is zero: * array[0] holds the actual length * array[1..(length+3)/4] holds data * size = 4 + length (bytes) * else * length = type_len << 2 * array[0..(length+3)/4-1] holds data * size = 4 + length (bytes) */enum ring_buffer_type { RINGBUF_TYPE_DATA_TYPE_LEN_MAX = 28, RINGBUF_TYPE_PADDING, RINGBUF_TYPE_TIME_EXTEND, RINGBUF_TYPE_TIME_STAMP,};
unsigned ring_buffer_event_length(struct ring_buffer_event *event);void *ring_buffer_event_data(struct ring_buffer_event *event);u64 ring_buffer_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *event);
/* * ring_buffer_discard_commit will remove an event that has not * been committed yet. If this is used, then ring_buffer_unlock_commit * must not be called on the discarded event. This function * will try to remove the event from the ring buffer completely * if another event has not been written after it. * * Example use: * * if (some_condition) * ring_buffer_discard_commit(buffer, event); * else * ring_buffer_unlock_commit(buffer, event); */void ring_buffer_discard_commit(struct trace_buffer *buffer, struct ring_buffer_event *event);
/* * size is in bytes for each per CPU buffer. */struct trace_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *key);
struct trace_buffer *__ring_buffer_alloc_range(unsigned long size, unsigned flags, int order, unsigned long start, unsigned long range_size, unsigned long scratch_size, struct lock_class_key *key);
void *ring_buffer_meta_scratch(struct trace_buffer *buffer, unsigned int *size);
/* * Because the ring buffer is generic, if other users of the ring buffer get * traced by ftrace, it can produce lockdep warnings. We need to keep each * ring buffer's lock class separate. */#define ring_buffer_alloc(size, flags) \({ \ static struct lock_class_key __key; \ __ring_buffer_alloc((size), (flags), &__key); \})
/* * Because the ring buffer is generic, if other users of the ring buffer get * traced by ftrace, it can produce lockdep warnings. We need to keep each * ring buffer's lock class separate. */#define ring_buffer_alloc_range(size, flags, order, start, range_size, s_size) \({ \ static struct lock_class_key __key; \ __ring_buffer_alloc_range((size), (flags), (order), (start), \ (range_size), (s_size), &__key); \})
typedef bool (*ring_buffer_cond_fn)(void *data);int ring_buffer_wait(struct trace_buffer *buffer, int cpu, int full, ring_buffer_cond_fn cond, void *data);__poll_t ring_buffer_poll_wait(struct trace_buffer *buffer, int cpu, struct file *filp, poll_table *poll_table, int full);void ring_buffer_wake_waiters(struct trace_buffer *buffer, int cpu);
#define RING_BUFFER_ALL_CPUS -1
void ring_buffer_free(struct trace_buffer *buffer);
int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, int cpu);
void ring_buffer_change_overwrite(struct trace_buffer *buffer, int val);
struct ring_buffer_event *ring_buffer_lock_reserve(struct trace_buffer *buffer, unsigned long length);int ring_buffer_unlock_commit(struct trace_buffer *buffer);int ring_buffer_write(struct trace_buffer *buffer, unsigned long length, void *data);
void ring_buffer_nest_start(struct trace_buffer *buffer);void ring_buffer_nest_end(struct trace_buffer *buffer);
DEFINE_GUARD(ring_buffer_nest, struct trace_buffer *, ring_buffer_nest_start(_T), ring_buffer_nest_end(_T))
struct ring_buffer_event *ring_buffer_peek(struct trace_buffer *buffer, int cpu, u64 *ts, unsigned long *lost_events);struct ring_buffer_event *ring_buffer_consume(struct trace_buffer *buffer, int cpu, u64 *ts, unsigned long *lost_events);
struct ring_buffer_iter *ring_buffer_read_start(struct trace_buffer *buffer, int cpu, gfp_t flags);void ring_buffer_read_finish(struct ring_buffer_iter *iter);
struct ring_buffer_event *ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts);void ring_buffer_iter_advance(struct ring_buffer_iter *iter);void ring_buffer_iter_reset(struct ring_buffer_iter *iter);int ring_buffer_iter_empty(struct ring_buffer_iter *iter);bool ring_buffer_iter_dropped(struct ring_buffer_iter *iter);
unsigned long ring_buffer_size(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_max_event_size(struct trace_buffer *buffer);
void ring_buffer_reset_cpu(struct trace_buffer *buffer, int cpu);void ring_buffer_reset_online_cpus(struct trace_buffer *buffer);void ring_buffer_reset(struct trace_buffer *buffer);
#ifdef CONFIG_RING_BUFFER_ALLOW_SWAPint ring_buffer_swap_cpu(struct trace_buffer *buffer_a, struct trace_buffer *buffer_b, int cpu);#elsestatic inline intring_buffer_swap_cpu(struct trace_buffer *buffer_a, struct trace_buffer *buffer_b, int cpu){ return -ENODEV;}#endif
bool ring_buffer_empty(struct trace_buffer *buffer);bool ring_buffer_empty_cpu(struct trace_buffer *buffer, int cpu);
void ring_buffer_record_disable(struct trace_buffer *buffer);void ring_buffer_record_enable(struct trace_buffer *buffer);void ring_buffer_record_off(struct trace_buffer *buffer);void ring_buffer_record_on(struct trace_buffer *buffer);bool ring_buffer_record_is_on(struct trace_buffer *buffer);bool ring_buffer_record_is_set_on(struct trace_buffer *buffer);bool ring_buffer_record_is_on_cpu(struct trace_buffer *buffer, int cpu);void ring_buffer_record_disable_cpu(struct trace_buffer *buffer, int cpu);void ring_buffer_record_enable_cpu(struct trace_buffer *buffer, int cpu);
u64 ring_buffer_oldest_event_ts(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_bytes_cpu(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_entries(struct trace_buffer *buffer);unsigned long ring_buffer_overruns(struct trace_buffer *buffer);unsigned long ring_buffer_entries_cpu(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_overrun_cpu(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_commit_overrun_cpu(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_dropped_events_cpu(struct trace_buffer *buffer, int cpu);unsigned long ring_buffer_read_events_cpu(struct trace_buffer *buffer, int cpu);
u64 ring_buffer_time_stamp(struct trace_buffer *buffer);void ring_buffer_normalize_time_stamp(struct trace_buffer *buffer, int cpu, u64 *ts);void ring_buffer_set_clock(struct trace_buffer *buffer, u64 (*clock)(void));void ring_buffer_set_time_stamp_abs(struct trace_buffer *buffer, bool abs);bool ring_buffer_time_stamp_abs(struct trace_buffer *buffer);
size_t ring_buffer_nr_dirty_pages(struct trace_buffer *buffer, int cpu);
struct buffer_data_read_page;struct buffer_data_read_page *ring_buffer_alloc_read_page(struct trace_buffer *buffer, int cpu);void ring_buffer_free_read_page(struct trace_buffer *buffer, int cpu, struct buffer_data_read_page *page);int ring_buffer_read_page(struct trace_buffer *buffer, struct buffer_data_read_page *data_page, size_t len, int cpu, int full);void *ring_buffer_read_page_data(struct buffer_data_read_page *page);
struct trace_seq;
int ring_buffer_print_entry_header(struct trace_seq *s);int ring_buffer_print_page_header(struct trace_buffer *buffer, struct trace_seq *s);
int ring_buffer_subbuf_order_get(struct trace_buffer *buffer);int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order);int ring_buffer_subbuf_size_get(struct trace_buffer *buffer);
enum ring_buffer_flags { RB_FL_OVERWRITE = 1 << 0, RB_FL_TESTING = 1 << 1,};
#ifdef CONFIG_RING_BUFFERint trace_rb_cpu_prepare(unsigned int cpu, struct hlist_node *node);#else#define trace_rb_cpu_prepare NULL#endif
int ring_buffer_map(struct trace_buffer *buffer, int cpu, struct vm_area_struct *vma);void ring_buffer_map_dup(struct trace_buffer *buffer, int cpu);int ring_buffer_unmap(struct trace_buffer *buffer, int cpu);int ring_buffer_map_get_reader(struct trace_buffer *buffer, int cpu);
struct ring_buffer_desc { int cpu; unsigned int nr_page_va; /* excludes the meta page */ unsigned long meta_va; unsigned long page_va[] __counted_by(nr_page_va);};
struct trace_buffer_desc { int nr_cpus; size_t struct_len; char __data[]; /* list of ring_buffer_desc */};
static inline struct ring_buffer_desc *__next_ring_buffer_desc(struct ring_buffer_desc *desc){ size_t len = struct_size(desc, page_va, desc->nr_page_va);
return (struct ring_buffer_desc *)((void *)desc + len);}
static inline struct ring_buffer_desc *__first_ring_buffer_desc(struct trace_buffer_desc *desc){ return (struct ring_buffer_desc *)(&desc->__data[0]);}
static inline size_t trace_buffer_desc_size(size_t buffer_size, unsigned int nr_cpus){ unsigned int nr_pages = max(DIV_ROUND_UP(buffer_size, PAGE_SIZE), 2UL) + 1; struct ring_buffer_desc *rbdesc;
return size_add(offsetof(struct trace_buffer_desc, __data), size_mul(nr_cpus, struct_size(rbdesc, page_va, nr_pages)));}
#define for_each_ring_buffer_desc(__pdesc, __cpu, __trace_pdesc) \ for (__pdesc = __first_ring_buffer_desc(__trace_pdesc), __cpu = 0; \ (__cpu) < (__trace_pdesc)->nr_cpus; \ (__cpu)++, __pdesc = __next_ring_buffer_desc(__pdesc))
struct ring_buffer_remote { struct trace_buffer_desc *desc; int (*swap_reader_page)(unsigned int cpu, void *priv); int (*reset)(unsigned int cpu, void *priv); void *priv;};
int ring_buffer_poll_remote(struct trace_buffer *buffer, int cpu);
struct trace_buffer *__ring_buffer_alloc_remote(struct ring_buffer_remote *remote, struct lock_class_key *key);
#define ring_buffer_alloc_remote(remote) \({ \ static struct lock_class_key __key; \ __ring_buffer_alloc_remote(remote, &__key); \})#endif /* _LINUX_RING_BUFFER_H */