/* * v4l2-mc.h - Media Controller V4L2 types and prototypes * * Copyright (C) 2016 Mauro Carvalho Chehab * Copyright (C) 2006-2010 Nokia Corporation * Copyright (c) 2016 Intel Corporation. * * 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. */ #ifndef _V4L2_MC_H #define _V4L2_MC_H #include #include #include /** * enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER * * @TUNER_PAD_RF_INPUT: Radiofrequency (RF) sink pad, usually linked to a * RF connector entity. * @TUNER_PAD_OUTPUT: Tuner video output source pad. Contains the video * chrominance and luminance or the hole bandwidth * of the signal converted to an Intermediate Frequency * (IF) or to baseband (on zero-IF tuners). * @TUNER_PAD_AUD_OUT: Tuner audio output source pad. Tuners used to decode * analog TV signals have an extra pad for audio output. * Old tuners use an analog stage with a saw filter for * the audio IF frequency. The output of the pad is, in * this case, the audio IF, with should be decoded either * by the bridge chipset (that's the case of cx2388x * chipsets) or may require an external IF sound * processor, like msp34xx. On modern silicon tuners, * the audio IF decoder is usually incorporated at the * tuner. On such case, the output of this pad is an * audio sampled data. * @TUNER_NUM_PADS: Number of pads of the tuner. */ enum tuner_pad_index { TUNER_PAD_RF_INPUT, TUNER_PAD_OUTPUT, TUNER_PAD_AUD_OUT, TUNER_NUM_PADS }; /** * enum if_vid_dec_pad_index - video IF-PLL pad index for * MEDIA_ENT_F_IF_VID_DECODER * * @IF_VID_DEC_PAD_IF_INPUT: video Intermediate Frequency (IF) sink pad * @IF_VID_DEC_PAD_OUT: IF-PLL video output source pad. Contains the * video chrominance and luminance IF signals. * @IF_VID_DEC_PAD_NUM_PADS: Number of pads of the video IF-PLL. */ enum if_vid_dec_pad_index { IF_VID_DEC_PAD_IF_INPUT, IF_VID_DEC_PAD_OUT, IF_VID_DEC_PAD_NUM_PADS }; /** * enum if_aud_dec_pad_index - audio/sound IF-PLL pad index for * MEDIA_ENT_F_IF_AUD_DECODER * * @IF_AUD_DEC_PAD_IF_INPUT: audio Intermediate Frequency (IF) sink pad * @IF_AUD_DEC_PAD_OUT: IF-PLL audio output source pad. Contains the * audio sampled stream data, usually connected * to the bridge bus via an Inter-IC Sound (I2S) * bus. * @IF_AUD_DEC_PAD_NUM_PADS: Number of pads of the audio IF-PLL. */ enum if_aud_dec_pad_index { IF_AUD_DEC_PAD_IF_INPUT, IF_AUD_DEC_PAD_OUT, IF_AUD_DEC_PAD_NUM_PADS }; /** * enum demod_pad_index - analog TV pad index for MEDIA_ENT_F_ATV_DECODER * * @DEMOD_PAD_IF_INPUT: IF input sink pad. * @DEMOD_PAD_VID_OUT: Video output source pad. * @DEMOD_PAD_VBI_OUT: Vertical Blank Interface (VBI) output source pad. * @DEMOD_PAD_AUDIO_OUT: Audio output source pad. * @DEMOD_NUM_PADS: Maximum number of output pads. */ enum demod_pad_index { DEMOD_PAD_IF_INPUT, DEMOD_PAD_VID_OUT, DEMOD_PAD_VBI_OUT, DEMOD_PAD_AUDIO_OUT, DEMOD_NUM_PADS }; /* We don't need to include pci.h or usb.h here */ struct pci_dev; struct usb_device; #ifdef CONFIG_MEDIA_CONTROLLER /** * v4l2_mc_create_media_graph() - create Media Controller links at the graph. * * @mdev: pointer to the &media_device struct. * * Add links between the entities commonly found on PC customer's hardware at * the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners, * analog TV decoder and I/O entities (video, VBI and Software Defined Radio). * * .. note:: * * Webcams are modelled on a very simple way: the sensor is * connected directly to the I/O entity. All dirty details, like * scaler and crop HW are hidden. While such mapping is enough for v4l2 * interface centric PC-consumer's hardware, V4L2 subdev centric camera * hardware should not use this routine, as it will not build the right graph. */ int v4l2_mc_create_media_graph(struct media_device *mdev); /** * v4l_enable_media_source() - Hold media source for exclusive use * if free * * @vdev: pointer to struct video_device * * This interface calls enable_source handler to determine if * media source is free for use. The enable_source handler is * responsible for checking is the media source is free and * start a pipeline between the media source and the media * entity associated with the video device. This interface * should be called from v4l2-core and dvb-core interfaces * that change the source configuration. * * Return: returns zero on success or a negative error code. */ int v4l_enable_media_source(struct video_device *vdev); /** * v4l_disable_media_source() - Release media source * * @vdev: pointer to struct video_device * * This interface calls disable_source handler to release * the media source. The disable_source handler stops the * active media pipeline between the media source and the * media entity associated with the video device. * * Return: returns zero on success or a negative error code. */ void v4l_disable_media_source(struct video_device *vdev); /* * v4l_vb2q_enable_media_tuner - Hold media source for exclusive use * if free. * @q - pointer to struct vb2_queue * * Wrapper for v4l_enable_media_source(). This function should * be called from v4l2-core to enable the media source with * pointer to struct vb2_queue as the input argument. Some * v4l2-core interfaces don't have access to video device and * this interface finds the struct video_device for the q and * calls v4l_enable_media_source(). */ int v4l_vb2q_enable_media_source(struct vb2_queue *q); /** * v4l2_pipeline_pm_use - Update the use count of an entity * @entity: The entity * @use: Use (1) or stop using (0) the entity * * Update the use count of all entities in the pipeline and power entities on or * off accordingly. * * This function is intended to be called in video node open (use == * 1) and release (use == 0). It uses struct media_entity.use_count to * track the power status. The use of this function should be paired * with v4l2_pipeline_link_notify(). * * Return 0 on success or a negative error code on failure. Powering entities * off is assumed to never fail. No failure can occur when the use parameter is * set to 0. */ int v4l2_pipeline_pm_use(struct media_entity *entity, int use); /** * v4l2_pipeline_link_notify - Link management notification callback * @link: The link * @flags: New link flags that will be applied * @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*) * * React to link management on powered pipelines by updating the use count of * all entities in the source and sink sides of the link. Entities are powered * on or off accordingly. The use of this function should be paired * with v4l2_pipeline_pm_use(). * * Return 0 on success or a negative error code on failure. Powering entities * off is assumed to never fail. This function will not fail for disconnection * events. */ int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, unsigned int notification); #else /* CONFIG_MEDIA_CONTROLLER */ static inline int v4l2_mc_create_media_graph(struct media_device *mdev) { return 0; } static inline int v4l_enable_media_source(struct video_device *vdev) { return 0; } static inline void v4l_disable_media_source(struct video_device *vdev) { } static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q) { return 0; } static inline int v4l2_pipeline_pm_use(struct media_entity *entity, int use) { return 0; } static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags, unsigned int notification) { return 0; } #endif /* CONFIG_MEDIA_CONTROLLER */ #endif /* _V4L2_MC_H */ (unmodified v3.4-rc1 with user namespace support disabled) v3.4-rc1-userns-: ~= 155ns (v3.4-rc1 with my user namespace patches and user namespace support disabled) v3.4-rc1-userns+: ~= 164ns (v3.4-rc1 with my user namespace patches and user namespace support enabled) All of the configurations ran in roughly 120ns when I performed tests that ran in the cpu cache. So in summary the performance impact is: 1ns improvement in the worst case with user namespace support compiled out. 8ns aka 5% slowdown in the worst case with user namespace support compiled in. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'kernel/user.c')