[lttng-modules.git] / lttng-context-interruptible.c

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 *
 * lttng-context-interruptible.c
 *
 * LTTng interruptible context.
 *
 * Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

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

/*
 * Interruptible at value -1 means "unknown".
 */

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

	size += lib_ring_buffer_align(offset, lttng_alignof(int8_t));
	size += sizeof(int8_t);
	return size;
}

static
void interruptible_record(struct lttng_ctx_field *field,
		struct lib_ring_buffer_ctx *ctx,
		struct lttng_channel *chan)
{
	struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv;
	int8_t interruptible = lttng_probe_ctx->interruptible;

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

static
void interruptible_get_value(struct lttng_ctx_field *field,
		struct lttng_probe_ctx *lttng_probe_ctx,
		union lttng_ctx_value *value)
{
	int8_t interruptible = lttng_probe_ctx->interruptible;

	value->s64 = interruptible;
}

int lttng_add_interruptible_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, "interruptible")) {
		lttng_remove_context_field(ctx, field);
		return -EEXIST;
	}
	field->event_field.name = "interruptible";
	field->event_field.type.atype = atype_integer;
	field->event_field.type.u.basic.integer.size = sizeof(int8_t) * CHAR_BIT;
	field->event_field.type.u.basic.integer.alignment = lttng_alignof(int8_t) * CHAR_BIT;
	field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(int8_t);
	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 = interruptible_get_size;
	field->record = interruptible_record;
	field->get_value = interruptible_get_value;
	lttng_context_update(*ctx);
	wrapper_vmalloc_sync_mappings();
	return 0;
}
EXPORT_SYMBOL_GPL(lttng_add_interruptible_to_ctx);
Commit	Line	Data
9f36eaed MJ	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
9f36eaed MJ	2	*
79150a49 JD	3	* lttng-context-interruptible.c
	4	*
	5	* LTTng interruptible context.
	6	*
	7	* Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
79150a49 JD	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/slab.h>
	12	#include <linux/sched.h>
	13	#include <linux/irqflags.h>
241ae9a8 MD	14	#include <lttng-events.h>
	15	#include <wrapper/ringbuffer/frontend_types.h>
	16	#include <wrapper/vmalloc.h>
	17	#include <lttng-tracer.h>
79150a49 JD	18
	19	/*
	20	* Interruptible at value -1 means "unknown".
	21	*/
	22
	23	static
	24	size_t interruptible_get_size(size_t offset)
	25	{
	26	size_t size = 0;
	27
	28	size += lib_ring_buffer_align(offset, lttng_alignof(int8_t));
	29	size += sizeof(int8_t);
	30	return size;
	31	}
	32
	33	static
	34	void interruptible_record(struct lttng_ctx_field *field,
	35	struct lib_ring_buffer_ctx *ctx,
	36	struct lttng_channel *chan)
	37	{
	38	struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv;
	39	int8_t interruptible = lttng_probe_ctx->interruptible;
	40
	41	lib_ring_buffer_align_ctx(ctx, lttng_alignof(interruptible));
	42	chan->ops->event_write(ctx, &interruptible, sizeof(interruptible));
	43	}
	44
	45	static
	46	void interruptible_get_value(struct lttng_ctx_field *field,
	47	struct lttng_probe_ctx *lttng_probe_ctx,
	48	union lttng_ctx_value *value)
	49	{
	50	int8_t interruptible = lttng_probe_ctx->interruptible;
	51
	52	value->s64 = interruptible;
	53	}
	54
	55	int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx)
	56	{
	57	struct lttng_ctx_field *field;
	58
	59	field = lttng_append_context(ctx);
	60	if (!field)
	61	return -ENOMEM;
	62	if (lttng_find_context(*ctx, "interruptible")) {
	63	lttng_remove_context_field(ctx, field);
	64	return -EEXIST;
	65	}
	66	field->event_field.name = "interruptible";
	67	field->event_field.type.atype = atype_integer;
	68	field->event_field.type.u.basic.integer.size = sizeof(int8_t) * CHAR_BIT;
	69	field->event_field.type.u.basic.integer.alignment = lttng_alignof(int8_t) * CHAR_BIT;
	70	field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(int8_t);
	71	field->event_field.type.u.basic.integer.reverse_byte_order = 0;
	72	field->event_field.type.u.basic.integer.base = 10;
	73	field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
	74	field->get_size = interruptible_get_size;
	75	field->record = interruptible_record;
	76	field->get_value = interruptible_get_value;
	77	lttng_context_update(*ctx);
da0fcb14	78	wrapper_vmalloc_sync_mappings();
79150a49 JD	79	return 0;
	80	}
	81	EXPORT_SYMBOL_GPL(lttng_add_interruptible_to_ctx);