[lttng-modules.git] / lttng-context-cpu-id.c

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 *
 * lttng-context-cpu-id.c
 *
 * LTTng CPU id context.
 *
 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <lttng-events.h>
#include <wrapper/ringbuffer/frontend_types.h>
#include <wrapper/vmalloc.h>
#include <lttng-tracer.h>

static
size_t cpu_id_get_size(size_t offset)
{
	size_t size = 0;

	size += lib_ring_buffer_align(offset, lttng_alignof(int));
	size += sizeof(int);
	return size;
}

static
void cpu_id_record(struct lttng_ctx_field *field,
		struct lib_ring_buffer_ctx *ctx,
		struct lttng_channel *chan)
{
	int cpu;

	cpu = ctx->cpu;
	lib_ring_buffer_align_ctx(ctx, lttng_alignof(cpu));
	chan->ops->event_write(ctx, &cpu, sizeof(cpu));
}

static
void cpu_id_get_value(struct lttng_ctx_field *field,
		struct lttng_probe_ctx *lttng_probe_ctx,
		union lttng_ctx_value *value)
{
	value->s64 = smp_processor_id();
}

int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx)
{
	struct lttng_ctx_field *field;

	field = lttng_append_context(ctx);
	if (!field)
		return -ENOMEM;
	if (lttng_find_context(*ctx, "cpu_id")) {
		lttng_remove_context_field(ctx, field);
		return -EEXIST;
	}
	field->event_field.name = "cpu_id";
	field->event_field.type.atype = atype_integer;
	field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT;
	field->event_field.type.u.basic.integer.alignment = lttng_alignof(int) * CHAR_BIT;
	field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(int);
	field->event_field.type.u.basic.integer.reverse_byte_order = 0;
	field->event_field.type.u.basic.integer.base = 10;
	field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
	field->get_size = cpu_id_get_size;
	field->record = cpu_id_record;
	field->get_value = cpu_id_get_value;
	lttng_context_update(*ctx);
	wrapper_vmalloc_sync_mappings();
	return 0;
}
EXPORT_SYMBOL_GPL(lttng_add_cpu_id_to_ctx);
Commit	Line	Data
9f36eaed MJ	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
9f36eaed MJ	2	*
13edcd1d MD	3	* lttng-context-cpu-id.c
	4	*
	5	* LTTng CPU id context.
	6	*
	7	* Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
13edcd1d MD	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/slab.h>
	12	#include <linux/sched.h>
241ae9a8 MD	13	#include <lttng-events.h>
	14	#include <wrapper/ringbuffer/frontend_types.h>
	15	#include <wrapper/vmalloc.h>
	16	#include <lttng-tracer.h>
13edcd1d MD	17
	18	static
	19	size_t cpu_id_get_size(size_t offset)
	20	{
	21	size_t size = 0;
	22
1c23b886 MD	23	size += lib_ring_buffer_align(offset, lttng_alignof(int));
1c23b886 MD	24	size += sizeof(int);
13edcd1d MD	25	return size;
	26	}
	27
	28	static
	29	void cpu_id_record(struct lttng_ctx_field *field,
	30	struct lib_ring_buffer_ctx *ctx,
	31	struct lttng_channel *chan)
	32	{
1c23b886	33	int cpu;
13edcd1d MD	34
	35	cpu = ctx->cpu;
	36	lib_ring_buffer_align_ctx(ctx, lttng_alignof(cpu));
	37	chan->ops->event_write(ctx, &cpu, sizeof(cpu));
	38	}
	39
	40	static
	41	void cpu_id_get_value(struct lttng_ctx_field *field,
79150a49	42	struct lttng_probe_ctx *lttng_probe_ctx,
13edcd1d MD	43	union lttng_ctx_value *value)
	44	{
	45	value->s64 = smp_processor_id();
	46	}
	47
	48	int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx)
	49	{
	50	struct lttng_ctx_field *field;
	51
	52	field = lttng_append_context(ctx);
	53	if (!field)
	54	return -ENOMEM;
	55	if (lttng_find_context(*ctx, "cpu_id")) {
	56	lttng_remove_context_field(ctx, field);
	57	return -EEXIST;
	58	}
	59	field->event_field.name = "cpu_id";
	60	field->event_field.type.atype = atype_integer;
1c23b886 MD	61	field->event_field.type.u.basic.integer.size = sizeof(int) * CHAR_BIT;
	62	field->event_field.type.u.basic.integer.alignment = lttng_alignof(int) * CHAR_BIT;
	63	field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(int);
13edcd1d MD	64	field->event_field.type.u.basic.integer.reverse_byte_order = 0;
	65	field->event_field.type.u.basic.integer.base = 10;
	66	field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
	67	field->get_size = cpu_id_get_size;
	68	field->record = cpu_id_record;
	69	field->get_value = cpu_id_get_value;
	70	lttng_context_update(*ctx);
da0fcb14	71	wrapper_vmalloc_sync_mappings();
13edcd1d MD	72	return 0;
	73	}
	74	EXPORT_SYMBOL_GPL(lttng_add_cpu_id_to_ctx);