[lttng-modules.git] / ltt-event-header.c

/*
 * ltt/ltt-event-header.c
 *
 * (C) Copyright 2010 - Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
 *
 * LTTng event header.
 *
 * Author:
 *	Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

#include <linux/module.h>
#include "ltt-tracer.h"

void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config,
				   struct lib_ring_buffer_ctx *ctx,
				   u16 eID, u32 event_size)
{
	struct event_header header;
	u16 small_size;

	switch (ctx->rflags) {
	case LTT_RFLAG_ID_SIZE_TSC:
		header.id_time = 29 << LTT_TSC_BITS;
		break;
	case LTT_RFLAG_ID_SIZE:
		header.id_time = 30 << LTT_TSC_BITS;
		break;
	case LTT_RFLAG_ID:
		header.id_time = 31 << LTT_TSC_BITS;
		break;
	default:
		WARN_ON_ONCE(1);
		header.id_time = 0;
	}

	header.id_time |= (u32)ctx->tsc & LTT_TSC_MASK;
	lib_ring_buffer_write(config, ctx, &header, sizeof(header));

	switch (ctx->rflags) {
	case LTT_RFLAG_ID_SIZE_TSC:
		small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE);
		lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
		lib_ring_buffer_write(config, ctx, &small_size, sizeof(u16));
		if (small_size == LTT_MAX_SMALL_SIZE)
			lib_ring_buffer_write(config, ctx, &event_size,
					      sizeof(u32));
		lib_ring_buffer_align_ctx(ctx, sizeof(u64));
		lib_ring_buffer_write(config, ctx, &ctx->tsc, sizeof(u64));
		break;
	case LTT_RFLAG_ID_SIZE:
		small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE);
		lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
		lib_ring_buffer_write(config, ctx, &small_size, sizeof(u16));
		if (small_size == LTT_MAX_SMALL_SIZE)
			lib_ring_buffer_write(config, ctx, &event_size,
					      sizeof(u32));
		break;
	case LTT_RFLAG_ID:
		lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
		break;
	}
}
EXPORT_SYMBOL_GPL(ltt_write_event_header_slow);
Commit	Line	Data
1c8284eb MD	1	/*
	2	* ltt/ltt-event-header.c
	3	*
	4	* (C) Copyright 2010 - Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
	5	*
	6	* LTTng event header.
	7	*
	8	* Author:
	9	* Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
	10	*
	11	* Dual LGPL v2.1/GPL v2 license.
	12	*/
	13
	14	#include <linux/module.h>
1c8284eb	15	#include "ltt-tracer.h"
1c8284eb	16
1c25284c	17	void ltt_write_event_header_slow(const struct lib_ring_buffer_config *config,
7514523f MD	18	struct lib_ring_buffer_ctx *ctx,
7514523f MD	19	u16 eID, u32 event_size)
1c8284eb	20	{
7514523f	21	struct event_header header;
1c8284eb MD	22	u16 small_size;
1c8284eb MD	23
1c25284c	24	switch (ctx->rflags) {
1c8284eb MD	25	case LTT_RFLAG_ID_SIZE_TSC:
	26	header.id_time = 29 << LTT_TSC_BITS;
	27	break;
	28	case LTT_RFLAG_ID_SIZE:
	29	header.id_time = 30 << LTT_TSC_BITS;
	30	break;
	31	case LTT_RFLAG_ID:
	32	header.id_time = 31 << LTT_TSC_BITS;
	33	break;
	34	default:
	35	WARN_ON_ONCE(1);
	36	header.id_time = 0;
	37	}
	38
1c25284c	39	header.id_time \|= (u32)ctx->tsc & LTT_TSC_MASK;
7514523f	40	lib_ring_buffer_write(config, ctx, &header, sizeof(header));
1c8284eb	41
1c25284c	42	switch (ctx->rflags) {
1c8284eb MD	43	case LTT_RFLAG_ID_SIZE_TSC:
1c8284eb MD	44	small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE);
7514523f MD	45	lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
	46	lib_ring_buffer_write(config, ctx, &small_size, sizeof(u16));
	47	if (small_size == LTT_MAX_SMALL_SIZE)
	48	lib_ring_buffer_write(config, ctx, &event_size,
	49	sizeof(u32));
6db3d13b	50	lib_ring_buffer_align_ctx(ctx, sizeof(u64));
7514523f	51	lib_ring_buffer_write(config, ctx, &ctx->tsc, sizeof(u64));
1c8284eb MD	52	break;
	53	case LTT_RFLAG_ID_SIZE:
	54	small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE);
7514523f MD	55	lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
	56	lib_ring_buffer_write(config, ctx, &small_size, sizeof(u16));
	57	if (small_size == LTT_MAX_SMALL_SIZE)
	58	lib_ring_buffer_write(config, ctx, &event_size,
	59	sizeof(u32));
1c8284eb MD	60	break;
1c8284eb MD	61	case LTT_RFLAG_ID:
7514523f	62	lib_ring_buffer_write(config, ctx, &eID, sizeof(u16));
1c8284eb MD	63	break;
1c8284eb MD	64	}
1c8284eb MD	65	}
1c8284eb MD	66	EXPORT_SYMBOL_GPL(ltt_write_event_header_slow);