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authorYonghong Song <yhs@fb.com>2017-08-04 16:00:09 -0700
committerDavid S. Miller <davem@davemloft.net>2017-08-07 14:09:48 -0700
commitcf5f5cea270655dd49370760576c64b228583b79 (patch)
tree5758e9d56b94542d082d40ed66f8d8effa6287f9 /tools/perf/scripts/python/syscall-counts.py
parentof_mdio: use of_property_read_u32_array() (diff)
bpf: add support for sys_enter_* and sys_exit_* tracepoints
Currently, bpf programs cannot be attached to sys_enter_* and sys_exit_* style tracepoints. The iovisor/bcc issue #748 (https://github.com/iovisor/bcc/issues/748) documents this issue. For example, if you try to attach a bpf program to tracepoints syscalls/sys_enter_newfstat, you will get the following error: # ./tools/trace.py t:syscalls:sys_enter_newfstat Ioctl(PERF_EVENT_IOC_SET_BPF): Invalid argument Failed to attach BPF to tracepoint The main reason is that syscalls/sys_enter_* and syscalls/sys_exit_* tracepoints are treated differently from other tracepoints and there is no bpf hook to it. This patch adds bpf support for these syscalls tracepoints by . permitting bpf attachment in ioctl PERF_EVENT_IOC_SET_BPF . calling bpf programs in perf_syscall_enter and perf_syscall_exit The legality of bpf program ctx access is also checked. Function trace_event_get_offsets returns correct max offset for each specific syscall tracepoint, which is compared against the maximum offset access in bpf program. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions
Copyright © 1996 – 2026 Jason A. Donenfeld. All Rights Reverse Engineered.
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/*
    ioctl control functions
    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
    Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/kernel.h>

#include "ivtv-driver.h"
#include "ivtv-cards.h"
#include "ivtv-ioctl.h"
#include "ivtv-routing.h"
#include "ivtv-i2c.h"
#include "ivtv-mailbox.h"
#include "ivtv-controls.h"

/* Must be sorted from low to high control ID! */
static const u32 user_ctrls[] = {
	V4L2_CID_USER_CLASS,
	V4L2_CID_BRIGHTNESS,
	V4L2_CID_CONTRAST,
	V4L2_CID_SATURATION,
	V4L2_CID_HUE,
	V4L2_CID_AUDIO_VOLUME,
	V4L2_CID_AUDIO_BALANCE,
	V4L2_CID_AUDIO_BASS,
	V4L2_CID_AUDIO_TREBLE,
	V4L2_CID_AUDIO_MUTE,
	V4L2_CID_AUDIO_LOUDNESS,
	0
};

static const u32 *ctrl_classes[] = {
	user_ctrls,
	cx2341x_mpeg_ctrls,
	NULL
};


int ivtv_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *qctrl)
{
	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
	const char *name;

	qctrl->id = v4l2_ctrl_next(ctrl_classes, qctrl->id);
	if (qctrl->id == 0)
		return -EINVAL;

	switch (qctrl->id) {
	/* Standard V4L2 controls */
	case V4L2_CID_USER_CLASS:
		return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
		if (v4l2_subdev_call(itv->sd_video, core, queryctrl, qctrl))
			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
		return 0;

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_LOUDNESS:
		if (v4l2_subdev_call(itv->sd_audio, core, queryctrl, qctrl))
			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
		return 0;

	default:
		if (cx2341x_ctrl_query(&itv->params, qctrl))
			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
		return 0;
	}
	strncpy(qctrl->name, name, sizeof(qctrl->name) - 1);
	qctrl->name[sizeof(qctrl->name) - 1] = 0;
	return 0;
}

int ivtv_querymenu(struct file *file, void *fh, struct v4l2_querymenu *qmenu)
{
	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
	struct v4l2_queryctrl qctrl;

	qctrl.id = qmenu->id;
	ivtv_queryctrl(file, fh, &qctrl);
	return v4l2_ctrl_query_menu(qmenu, &qctrl,
			cx2341x_ctrl_get_menu(&itv->params, qmenu->id));
}

static int ivtv_try_ctrl(struct file *file, void *fh,
					struct v4l2_ext_control *vctrl)
{
	struct v4l2_queryctrl qctrl;
	const char **menu_items = NULL;
	int err;

	qctrl.id = vctrl->id;
	err = ivtv_queryctrl(file, fh, &qctrl);
	if (err)
		return err;
	if (qctrl.type == V4L2_CTRL_TYPE_MENU)
		menu_items = v4l2_ctrl_get_menu(qctrl.id);
	return v4l2_ctrl_check(vctrl, &qctrl, menu_items);
}

static int ivtv_s_ctrl(struct ivtv *itv, struct v4l2_control *vctrl)
{
	switch (vctrl->id) {
		/* Standard V4L2 controls */
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
		return v4l2_subdev_call(itv->sd_video, core, s_ctrl, vctrl);

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_LOUDNESS:
		return v4l2_subdev_call(itv->sd_audio, core, s_ctrl, vctrl);

	default:
		IVTV_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
		return -EINVAL;
	}
	return 0;
}

static int ivtv_g_ctrl(struct ivtv *itv, struct v4l2_control *vctrl)
{
	switch (vctrl->id) {
		/* Standard V4L2 controls */
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
		return v4l2_subdev_call(itv->sd_video, core, g_ctrl, vctrl);

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_LOUDNESS:
		return v4l2_subdev_call(itv->sd_audio, core, g_ctrl, vctrl);
	default:
		IVTV_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
		return -EINVAL;
	}
	return 0;
}

static int ivtv_setup_vbi_fmt(struct ivtv *itv, enum v4l2_mpeg_stream_vbi_fmt fmt)
{
	if (!(itv->v4l2_cap & V4L2_CAP_SLICED_VBI_CAPTURE))
		return -EINVAL;
	if (atomic_read(&itv->capturing) > 0)
		return -EBUSY;

	/* First try to allocate sliced VBI buffers if needed. */
	if (fmt && itv->vbi.sliced_mpeg_data[0] == NULL) {
		int i;

		for (i = 0; i < IVTV_VBI_FRAMES; i++) {
			/* Yuck, hardcoded. Needs to be a define */
			itv->vbi.sliced_mpeg_data[i] = kmalloc(2049, GFP_KERNEL);
			if (itv->vbi.sliced_mpeg_data[i] == NULL) {
				while (--i >= 0) {
					kfree(itv->vbi.sliced_mpeg_data[i]);
					itv->vbi.sliced_mpeg_data[i] = NULL;
				}
				return -ENOMEM;
			}
		}
	}

	itv->vbi.insert_mpeg = fmt;

	if (itv->vbi.insert_mpeg == 0) {
		return 0;
	}
	/* Need sliced data for mpeg insertion */
	if (ivtv_get_service_set(itv->vbi.sliced_in) == 0) {
		if (itv->is_60hz)
			itv->vbi.sliced_in->service_set = V4L2_SLICED_CAPTION_525;
		else
			itv->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
		ivtv_expand_service_set(itv->vbi.sliced_in, itv->is_50hz);
	}
	return 0;
}

int ivtv_g_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
{
	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
	struct v4l2_control ctrl;

	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
		int i;
		int err = 0;

		for (i = 0; i < c->count; i++) {
			ctrl.id = c->controls[i].id;
			ctrl.value = c->controls[i].value;
			err = ivtv_g_ctrl(itv, &ctrl);
			c->controls[i].value = ctrl.value;
			if (err) {
				c->error_idx = i;
				break;
			}
		}
		return err;
	}
	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG)
		return cx2341x_ext_ctrls(&itv->params, 0, c, VIDIOC_G_EXT_CTRLS);
	return -EINVAL;
}

int ivtv_s_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
{
	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
	struct v4l2_control ctrl;

	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
		int i;
		int err = 0;

		for (i = 0; i < c->count; i++) {
			ctrl.id = c->controls[i].id;
			ctrl.value = c->controls[i].value;
			err = ivtv_s_ctrl(itv, &ctrl);
			c->controls[i].value = ctrl.value;
			if (err) {
				c->error_idx = i;
				break;
			}
		}
		return err;
	}
	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
		static u32 freqs[3] = { 44100, 48000, 32000 };
		struct cx2341x_mpeg_params p = itv->params;
		int err = cx2341x_ext_ctrls(&p, atomic_read(&itv->capturing), c, VIDIOC_S_EXT_CTRLS);
		unsigned idx;

		if (err)
			return err;

		if (p.video_encoding != itv->params.video_encoding) {
			int is_mpeg1 = p.video_encoding ==
				V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
			struct v4l2_format fmt;

			/* fix videodecoder resolution */
			fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
			fmt.fmt.pix.width = itv->params.width / (is_mpeg1 ? 2 : 1);
			fmt.fmt.pix.height = itv->params.height;
			v4l2_subdev_call(itv->sd_video, video, s_fmt, &fmt);
		}
		err = cx2341x_update(itv, ivtv_api_func, &itv->params, &p);
		if (!err && itv->params.stream_vbi_fmt != p.stream_vbi_fmt)
			err = ivtv_setup_vbi_fmt(itv, p.stream_vbi_fmt);
		itv->params = p;
		itv->dualwatch_stereo_mode = p.audio_properties & 0x0300;
		idx = p.audio_properties & 0x03;
		/* The audio clock of the digitizer must match the codec sample
		   rate otherwise you get some very strange effects. */
		if (idx < ARRAY_SIZE(freqs))
			ivtv_call_all(itv, audio, s_clock_freq, freqs[idx]);
		return err;
	}
	return -EINVAL;
}

int ivtv_try_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
{
	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;

	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
		int i;
		int err = 0;

		for (i = 0; i < c->count; i++) {
			err = ivtv_try_ctrl(file, fh, &c->controls[i]);
			if (err) {
				c->error_idx = i;
				break;
			}
		}
		return err;
	}
	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG)
		return cx2341x_ext_ctrls(&itv->params, atomic_read(&itv->capturing), c, VIDIOC_TRY_EXT_CTRLS);
	return -EINVAL;
}