[lttng-tools.git] / src / common / kernel-ctl / kernel-ctl.c

/*
 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
 *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define __USE_LINUX_IOCTL_DEFS
#include <sys/ioctl.h>
#include <string.h>

#include "kernel-ctl.h"
#include "kernel-ioctl.h"

/*
 * This flag indicates which version of the kernel ABI to use. The old
 * ABI (namespace _old) does not support a 32-bit user-space when the
 * kernel is 64-bit. The old ABI is kept here for compatibility but is
 * deprecated and will be removed eventually.
 */
static int lttng_kernel_use_old_abi = -1;

/*
 * Execute the new or old ioctl depending on the ABI version.
 * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
 * this function tests if the new ABI is available and otherwise fallbacks
 * on the old one.
 * This function takes the fd on which the ioctl must be executed and the old
 * and new request codes.
 * It returns the return value of the ioctl executed.
 */
static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
		unsigned long newname)
{
	int ret;

	if (lttng_kernel_use_old_abi == -1) {
		ret = ioctl(fd, newname);
		if (!ret) {
			lttng_kernel_use_old_abi = 0;
			goto end;
		}
		lttng_kernel_use_old_abi = 1;
	}
	if (lttng_kernel_use_old_abi) {
		ret = ioctl(fd, oldname);
	} else {
		ret = ioctl(fd, newname);
	}

end:
	return ret;
}

int kernctl_create_session(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
			LTTNG_KERNEL_SESSION);
}

/* open the metadata global channel */
int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
{
	struct lttng_kernel_old_channel old_channel;
	struct lttng_kernel_channel channel;

	if (lttng_kernel_use_old_abi) {
		old_channel.overwrite = chops->overwrite;
		old_channel.subbuf_size = chops->subbuf_size;
		old_channel.num_subbuf = chops->num_subbuf;
		old_channel.switch_timer_interval = chops->switch_timer_interval;
		old_channel.read_timer_interval = chops->read_timer_interval;
		old_channel.output = chops->output;
		memcpy(old_channel.padding, chops->padding, sizeof(old_channel.padding));

		return ioctl(fd, LTTNG_KERNEL_OLD_METADATA, &old_channel);
	}

	channel.overwrite = chops->overwrite;
	channel.subbuf_size = chops->subbuf_size;
	channel.num_subbuf = chops->num_subbuf;
	channel.switch_timer_interval = chops->switch_timer_interval;
	channel.read_timer_interval = chops->read_timer_interval;
	channel.output = chops->output;
	memcpy(channel.padding, chops->padding, sizeof(channel.padding));

	return ioctl(fd, LTTNG_KERNEL_METADATA, &channel);
}

int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
{
	struct lttng_kernel_channel channel;

	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_channel old_channel;

		old_channel.overwrite = chops->overwrite;
		old_channel.subbuf_size = chops->subbuf_size;
		old_channel.num_subbuf = chops->num_subbuf;
		old_channel.switch_timer_interval = chops->switch_timer_interval;
		old_channel.read_timer_interval = chops->read_timer_interval;
		old_channel.output = chops->output;
		memcpy(old_channel.padding, chops->padding, sizeof(old_channel.padding));

		return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel);
	}

	channel.overwrite = chops->overwrite;
	channel.subbuf_size = chops->subbuf_size;
	channel.num_subbuf = chops->num_subbuf;
	channel.switch_timer_interval = chops->switch_timer_interval;
	channel.read_timer_interval = chops->read_timer_interval;
	channel.output = chops->output;
	memcpy(channel.padding, chops->padding, sizeof(channel.padding));

	return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel);
}

int kernctl_create_stream(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
			LTTNG_KERNEL_STREAM);
}

int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
{
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_event old_event;

		memcpy(old_event.name, ev->name, sizeof(old_event.name));
		old_event.instrumentation = ev->instrumentation;
		switch (ev->instrumentation) {
		case LTTNG_KERNEL_KPROBE:
			old_event.u.kprobe.addr = ev->u.kprobe.addr;
			old_event.u.kprobe.offset = ev->u.kprobe.offset;
			memcpy(old_event.u.kprobe.symbol_name,
				ev->u.kprobe.symbol_name,
				sizeof(old_event.u.kprobe.symbol_name));
			break;
		case LTTNG_KERNEL_KRETPROBE:
			old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
			old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
			memcpy(old_event.u.kretprobe.symbol_name,
				ev->u.kretprobe.symbol_name,
				sizeof(old_event.u.kretprobe.symbol_name));
			break;
		case LTTNG_KERNEL_FUNCTION:
			memcpy(old_event.u.ftrace.symbol_name,
					ev->u.ftrace.symbol_name,
					sizeof(old_event.u.ftrace.symbol_name));
			break;
		default:
			break;
		}

		return ioctl(fd, LTTNG_KERNEL_OLD_EVENT, &old_event);
	}
	return ioctl(fd, LTTNG_KERNEL_EVENT, ev);
}

int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
{
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_context old_ctx;

		old_ctx.ctx = ctx->ctx;
		/* only type that uses the union */
		if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
			old_ctx.u.perf_counter.type =
				ctx->u.perf_counter.type;
			old_ctx.u.perf_counter.config =
				ctx->u.perf_counter.config;
			memcpy(old_ctx.u.perf_counter.name,
				ctx->u.perf_counter.name,
				sizeof(old_ctx.u.perf_counter.name));
		}
		return ioctl(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
	}
	return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx);
}


/* Enable event, channel and session ioctl */
int kernctl_enable(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
			LTTNG_KERNEL_ENABLE);
}

/* Disable event, channel and session ioctl */
int kernctl_disable(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
			LTTNG_KERNEL_DISABLE);
}

int kernctl_start_session(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
			LTTNG_KERNEL_SESSION_START);
}

int kernctl_stop_session(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
			LTTNG_KERNEL_SESSION_STOP);
}

int kernctl_tracepoint_list(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
			LTTNG_KERNEL_TRACEPOINT_LIST);
}

int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
{
	int ret;

	if (lttng_kernel_use_old_abi == -1) {
		ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
		if (!ret) {
			lttng_kernel_use_old_abi = 0;
			goto end;
		}
		lttng_kernel_use_old_abi = 1;
	}
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_tracer_version old_v;

		ret = ioctl(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
		if (ret) {
			goto end;
		}
		v->major = old_v.major;
		v->minor = old_v.minor;
		v->patchlevel = old_v.patchlevel;
	} else {
		ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
	}

end:
	return ret;
}

int kernctl_wait_quiescent(int fd)
{
	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
			LTTNG_KERNEL_WAIT_QUIESCENT);
}

int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate)
{
	int ret;

	if (lttng_kernel_use_old_abi == -1) {
		ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
		if (!ret) {
			lttng_kernel_use_old_abi = 0;
			goto end;
		}
		lttng_kernel_use_old_abi = 1;
	}
	if (lttng_kernel_use_old_abi) {
		struct lttng_kernel_old_calibrate old_calibrate;

		old_calibrate.type = calibrate->type;
		ret = ioctl(fd, LTTNG_KERNEL_OLD_CALIBRATE, &old_calibrate);
		if (ret) {
			goto end;
		}
		calibrate->type = old_calibrate.type;
	} else {
		ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
	}

end:
	return ret;
}


int kernctl_buffer_flush(int fd)
{
	return ioctl(fd, RING_BUFFER_FLUSH);
}


/* Buffer operations */

/* For mmap mode, readable without "get" operation */

/* returns the length to mmap. */
int kernctl_get_mmap_len(int fd, unsigned long *len)
{
	return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len);
}

/* returns the maximum size for sub-buffers. */
int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
{
	return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
}

/*
 * For mmap mode, operate on the current packet (between get/put or
 * get_next/put_next).
 */

/* returns the offset of the subbuffer belonging to the mmap reader. */
int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
{
	return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
}

/* returns the size of the current sub-buffer, without padding (for mmap). */
int kernctl_get_subbuf_size(int fd, unsigned long *len)
{
	return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
}

/* returns the size of the current sub-buffer, without padding (for mmap). */
int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
{
	return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
}

/* Get exclusive read access to the next sub-buffer that can be read. */
int kernctl_get_next_subbuf(int fd)
{
	return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF);
}


/* Release exclusive sub-buffer access, move consumer forward. */
int kernctl_put_next_subbuf(int fd)
{
	return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
}

/* snapshot */

/* Get a snapshot of the current ring buffer producer and consumer positions */
int kernctl_snapshot(int fd)
{
	return ioctl(fd, RING_BUFFER_SNAPSHOT);
}

/* Get the consumer position (iteration start) */
int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
{
	return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
}

/* Get the producer position (iteration end) */
int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
{
	return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
}

/* Get exclusive read access to the specified sub-buffer position */
int kernctl_get_subbuf(int fd, unsigned long *len)
{
	return ioctl(fd, RING_BUFFER_GET_SUBBUF, len);
}

/* Release exclusive sub-buffer access */
int kernctl_put_subbuf(int fd)
{
	return ioctl(fd, RING_BUFFER_PUT_SUBBUF);
}
Commit	Line	Data
ee0326c0	1	/*
16421f6e DG	2	* Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
16421f6e DG	3	* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
ee0326c0	4	*
d14d33bf AM	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License, version 2 only,
	7	* as published by the Free Software Foundation.
ee0326c0 DG	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
d14d33bf AM	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
ee0326c0	17	*/
16421f6e	18
95ba0f2f	19	#define __USE_LINUX_IOCTL_DEFS
16421f6e	20	#include <sys/ioctl.h>
4dbc372b	21	#include <string.h>
16421f6e	22
10a8a223	23	#include "kernel-ctl.h"
16421f6e	24	#include "kernel-ioctl.h"
16421f6e	25
4dbc372b JD	26	/*
	27	* This flag indicates which version of the kernel ABI to use. The old
	28	* ABI (namespace _old) does not support a 32-bit user-space when the
	29	* kernel is 64-bit. The old ABI is kept here for compatibility but is
	30	* deprecated and will be removed eventually.
	31	*/
	32	static int lttng_kernel_use_old_abi = -1;
	33
	34	/*
	35	* Execute the new or old ioctl depending on the ABI version.
	36	* If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
	37	* this function tests if the new ABI is available and otherwise fallbacks
	38	* on the old one.
	39	* This function takes the fd on which the ioctl must be executed and the old
	40	* and new request codes.
	41	* It returns the return value of the ioctl executed.
	42	*/
	43	static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
	44	unsigned long newname)
	45	{
	46	int ret;
	47
	48	if (lttng_kernel_use_old_abi == -1) {
	49	ret = ioctl(fd, newname);
	50	if (!ret) {
	51	lttng_kernel_use_old_abi = 0;
	52	goto end;
	53	}
	54	lttng_kernel_use_old_abi = 1;
	55	}
	56	if (lttng_kernel_use_old_abi) {
	57	ret = ioctl(fd, oldname);
	58	} else {
	59	ret = ioctl(fd, newname);
	60	}
	61
	62	end:
	63	return ret;
	64	}
	65
964ccb60	66	int kernctl_create_session(int fd)
d65106b1	67	{
4dbc372b JD	68	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
4dbc372b JD	69	LTTNG_KERNEL_SESSION);
d65106b1 DG	70	}
d65106b1 DG	71
964ccb60 MD	72	/* open the metadata global channel */
964ccb60 MD	73	int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
f3ed775e	74	{
4dbc372b JD	75	struct lttng_kernel_old_channel old_channel;
	76	struct lttng_kernel_channel channel;
	77
	78	if (lttng_kernel_use_old_abi) {
	79	old_channel.overwrite = chops->overwrite;
	80	old_channel.subbuf_size = chops->subbuf_size;
	81	old_channel.num_subbuf = chops->num_subbuf;
	82	old_channel.switch_timer_interval = chops->switch_timer_interval;
	83	old_channel.read_timer_interval = chops->read_timer_interval;
	84	old_channel.output = chops->output;
	85	memcpy(old_channel.padding, chops->padding, sizeof(old_channel.padding));
	86
	87	return ioctl(fd, LTTNG_KERNEL_OLD_METADATA, &old_channel);
	88	}
	89
	90	channel.overwrite = chops->overwrite;
	91	channel.subbuf_size = chops->subbuf_size;
	92	channel.num_subbuf = chops->num_subbuf;
	93	channel.switch_timer_interval = chops->switch_timer_interval;
	94	channel.read_timer_interval = chops->read_timer_interval;
	95	channel.output = chops->output;
	96	memcpy(channel.padding, chops->padding, sizeof(channel.padding));
	97
	98	return ioctl(fd, LTTNG_KERNEL_METADATA, &channel);
f3ed775e DG	99	}
	100
	101	int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
16421f6e	102	{
4dbc372b JD	103	struct lttng_kernel_channel channel;
	104
	105	if (lttng_kernel_use_old_abi) {
	106	struct lttng_kernel_old_channel old_channel;
	107
	108	old_channel.overwrite = chops->overwrite;
	109	old_channel.subbuf_size = chops->subbuf_size;
	110	old_channel.num_subbuf = chops->num_subbuf;
	111	old_channel.switch_timer_interval = chops->switch_timer_interval;
	112	old_channel.read_timer_interval = chops->read_timer_interval;
	113	old_channel.output = chops->output;
	114	memcpy(old_channel.padding, chops->padding, sizeof(old_channel.padding));
	115
	116	return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel);
	117	}
	118
	119	channel.overwrite = chops->overwrite;
	120	channel.subbuf_size = chops->subbuf_size;
	121	channel.num_subbuf = chops->num_subbuf;
	122	channel.switch_timer_interval = chops->switch_timer_interval;
	123	channel.read_timer_interval = chops->read_timer_interval;
	124	channel.output = chops->output;
	125	memcpy(channel.padding, chops->padding, sizeof(channel.padding));
	126
	127	return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel);
16421f6e DG	128	}
16421f6e DG	129
964ccb60	130	int kernctl_create_stream(int fd)
16421f6e	131	{
4dbc372b JD	132	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
4dbc372b JD	133	LTTNG_KERNEL_STREAM);
16421f6e DG	134	}
16421f6e DG	135
964ccb60	136	int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
16421f6e	137	{
4dbc372b JD	138	if (lttng_kernel_use_old_abi) {
	139	struct lttng_kernel_old_event old_event;
	140
	141	memcpy(old_event.name, ev->name, sizeof(old_event.name));
	142	old_event.instrumentation = ev->instrumentation;
	143	switch (ev->instrumentation) {
	144	case LTTNG_KERNEL_KPROBE:
	145	old_event.u.kprobe.addr = ev->u.kprobe.addr;
	146	old_event.u.kprobe.offset = ev->u.kprobe.offset;
	147	memcpy(old_event.u.kprobe.symbol_name,
	148	ev->u.kprobe.symbol_name,
	149	sizeof(old_event.u.kprobe.symbol_name));
	150	break;
	151	case LTTNG_KERNEL_KRETPROBE:
	152	old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
	153	old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
	154	memcpy(old_event.u.kretprobe.symbol_name,
	155	ev->u.kretprobe.symbol_name,
	156	sizeof(old_event.u.kretprobe.symbol_name));
	157	break;
	158	case LTTNG_KERNEL_FUNCTION:
	159	memcpy(old_event.u.ftrace.symbol_name,
	160	ev->u.ftrace.symbol_name,
	161	sizeof(old_event.u.ftrace.symbol_name));
	162	break;
	163	default:
	164	break;
	165	}
	166
	167	return ioctl(fd, LTTNG_KERNEL_OLD_EVENT, &old_event);
	168	}
964ccb60	169	return ioctl(fd, LTTNG_KERNEL_EVENT, ev);
16421f6e DG	170	}
16421f6e DG	171
964ccb60	172	int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
16421f6e	173	{
4dbc372b JD	174	if (lttng_kernel_use_old_abi) {
	175	struct lttng_kernel_old_context old_ctx;
	176
	177	old_ctx.ctx = ctx->ctx;
	178	/* only type that uses the union */
	179	if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
	180	old_ctx.u.perf_counter.type =
	181	ctx->u.perf_counter.type;
	182	old_ctx.u.perf_counter.config =
	183	ctx->u.perf_counter.config;
	184	memcpy(old_ctx.u.perf_counter.name,
	185	ctx->u.perf_counter.name,
	186	sizeof(old_ctx.u.perf_counter.name));
	187	}
	188	return ioctl(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
	189	}
964ccb60	190	return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx);
16421f6e DG	191	}
16421f6e DG	192
964ccb60	193
f3ed775e DG	194	/* Enable event, channel and session ioctl */
	195	int kernctl_enable(int fd)
	196	{
4dbc372b JD	197	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
4dbc372b JD	198	LTTNG_KERNEL_ENABLE);
f3ed775e DG	199	}
	200
	201	/* Disable event, channel and session ioctl */
	202	int kernctl_disable(int fd)
	203	{
4dbc372b JD	204	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
4dbc372b JD	205	LTTNG_KERNEL_DISABLE);
f3ed775e DG	206	}
f3ed775e DG	207
964ccb60	208	int kernctl_start_session(int fd)
16421f6e	209	{
4dbc372b JD	210	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
4dbc372b JD	211	LTTNG_KERNEL_SESSION_START);
964ccb60 MD	212	}
	213
	214	int kernctl_stop_session(int fd)
	215	{
4dbc372b JD	216	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
4dbc372b JD	217	LTTNG_KERNEL_SESSION_STOP);
16421f6e DG	218	}
16421f6e DG	219
964ccb60 MD	220	int kernctl_tracepoint_list(int fd)
964ccb60 MD	221	{
4dbc372b JD	222	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
4dbc372b JD	223	LTTNG_KERNEL_TRACEPOINT_LIST);
964ccb60 MD	224	}
	225
	226	int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
	227	{
4dbc372b JD	228	int ret;
	229
	230	if (lttng_kernel_use_old_abi == -1) {
	231	ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
	232	if (!ret) {
	233	lttng_kernel_use_old_abi = 0;
	234	goto end;
	235	}
	236	lttng_kernel_use_old_abi = 1;
	237	}
	238	if (lttng_kernel_use_old_abi) {
	239	struct lttng_kernel_old_tracer_version old_v;
	240
	241	ret = ioctl(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
	242	if (ret) {
	243	goto end;
	244	}
	245	v->major = old_v.major;
	246	v->minor = old_v.minor;
	247	v->patchlevel = old_v.patchlevel;
	248	} else {
	249	ret = ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
	250	}
	251
	252	end:
	253	return ret;
964ccb60 MD	254	}
	255
	256	int kernctl_wait_quiescent(int fd)
	257	{
4dbc372b JD	258	return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
4dbc372b JD	259	LTTNG_KERNEL_WAIT_QUIESCENT);
964ccb60 MD	260	}
	261
	262	int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate)
	263	{
4dbc372b JD	264	int ret;
	265
	266	if (lttng_kernel_use_old_abi == -1) {
	267	ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
	268	if (!ret) {
	269	lttng_kernel_use_old_abi = 0;
	270	goto end;
	271	}
	272	lttng_kernel_use_old_abi = 1;
	273	}
	274	if (lttng_kernel_use_old_abi) {
	275	struct lttng_kernel_old_calibrate old_calibrate;
	276
	277	old_calibrate.type = calibrate->type;
	278	ret = ioctl(fd, LTTNG_KERNEL_OLD_CALIBRATE, &old_calibrate);
	279	if (ret) {
	280	goto end;
	281	}
	282	calibrate->type = old_calibrate.type;
	283	} else {
	284	ret = ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
	285	}
	286
	287	end:
	288	return ret;
964ccb60 MD	289	}
	290
	291
	292	int kernctl_buffer_flush(int fd)
	293	{
	294	return ioctl(fd, RING_BUFFER_FLUSH);
	295	}
	296
	297
	298	/* Buffer operations */
	299
	300	/* For mmap mode, readable without "get" operation */
	301
16421f6e DG	302	/* returns the length to mmap. */
	303	int kernctl_get_mmap_len(int fd, unsigned long *len)
	304	{
	305	return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len);
	306	}
	307
964ccb60 MD	308	/* returns the maximum size for sub-buffers. */
	309	int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
	310	{
	311	return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
	312	}
	313
	314	/*
	315	* For mmap mode, operate on the current packet (between get/put or
	316	* get_next/put_next).
	317	*/
	318
16421f6e DG	319	/* returns the offset of the subbuffer belonging to the mmap reader. */
	320	int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
	321	{
	322	return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
	323	}
	324
964ccb60 MD	325	/* returns the size of the current sub-buffer, without padding (for mmap). */
964ccb60 MD	326	int kernctl_get_subbuf_size(int fd, unsigned long *len)
16421f6e	327	{
964ccb60	328	return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
16421f6e DG	329	}
	330
	331	/* returns the size of the current sub-buffer, without padding (for mmap). */
	332	int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
	333	{
	334	return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
	335	}
	336
964ccb60 MD	337	/* Get exclusive read access to the next sub-buffer that can be read. */
964ccb60 MD	338	int kernctl_get_next_subbuf(int fd)
16421f6e	339	{
964ccb60	340	return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF);
16421f6e DG	341	}
16421f6e DG	342
d4a1283e	343
16421f6e DG	344	/* Release exclusive sub-buffer access, move consumer forward. */
	345	int kernctl_put_next_subbuf(int fd)
	346	{
	347	return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
	348	}
	349
964ccb60	350	/* snapshot */
16421f6e DG	351
	352	/* Get a snapshot of the current ring buffer producer and consumer positions */
	353	int kernctl_snapshot(int fd)
	354	{
	355	return ioctl(fd, RING_BUFFER_SNAPSHOT);
	356	}
	357
	358	/* Get the consumer position (iteration start) */
	359	int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
	360	{
	361	return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
	362	}
	363
	364	/* Get the producer position (iteration end) */
	365	int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
	366	{
	367	return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
	368	}
	369
964ccb60 MD	370	/* Get exclusive read access to the specified sub-buffer position */
964ccb60 MD	371	int kernctl_get_subbuf(int fd, unsigned long *len)
f3ed775e	372	{
964ccb60	373	return ioctl(fd, RING_BUFFER_GET_SUBBUF, len);
f3ed775e	374	}
d0254c7c	375
964ccb60 MD	376	/* Release exclusive sub-buffer access */
964ccb60 MD	377	int kernctl_put_subbuf(int fd)
d0254c7c	378	{
964ccb60	379	return ioctl(fd, RING_BUFFER_PUT_SUBBUF);
d0254c7c	380	}