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2020-08-13test: ipc: unixsocket: Close open fds on error pathsUmang Jain
Reported-by: Coverity CID=279099 Signed-off-by: Umang Jain <email@uajain.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-05-16libcamera: Move internal headers to include/libcamera/internal/Laurent Pinchart
The libcamera internal headers are located in src/libcamera/include/. The directory is added to the compiler headers search path with a meson include_directories() directive, and internal headers are included with (e.g. for the internal semaphore.h header) #include "semaphore.h" All was well, until libcxx decided to implement the C++20 synchronization library. The __threading_support header gained a #include <semaphore.h> to include the pthread's semaphore support. As include_directories() adds src/libcamera/include/ to the compiler search path with -I, the internal semaphore.h is included instead of the pthread version. Needless to say, the compiler isn't happy. Three options have been considered to fix this issue: - Use -iquote instead of -I. The -iquote option instructs gcc to only consider the header search path for headers included with the "" version. Meson unfortunately doesn't support this option. - Rename the internal semaphore.h header. This was deemed to be the beginning of a long whack-a-mole game, where namespace clashes with system libraries would appear over time (possibly dependent on particular system configurations) and would need to be constantly fixed. - Move the internal headers to another directory to create a unique namespace through path components. This causes lots of churn in all the existing source files through the all project. The first option would be best, but isn't available to us due to missing support in meson. Even if -iquote support was added, we would need to fix the problem before a new version of meson containing the required support would be released. The third option is thus the only practical solution available. Bite the bullet, and do it, moving headers to include/libcamera/internal/. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Jacopo Mondi <jacopo@jmondi.org>
2020-05-13licenses: License all meson files under CC0-1.0Laurent Pinchart
In an attempt to clarify the license terms of all files in the libcamera project, the build system files deserve particular attention. While they describe how the binaries are created, they are not themselves transformed into any part of binary distributions of the software, and thus don't influence the copyright on the binary packages. They are however subject to copyright, and thus influence the distribution terms of the source packages. Most of the meson.build files would not meet the threshold of originality criteria required for copyright protection. Some of the more complex meson.build files may be eligible for copyright protection. To avoid any ambiguity and uncertainty, state our intent to not assert copyrights on the build system files by putting them in the public domain with the CC0-1.0 license. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Acked-by: Giulio Benetti <giulio.benetti@micronovasrl.com> Acked-by: Jacopo Mondi <jacopo@jmondi.org> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Acked-by: Naushir Patuck <naush@raspberrypi.com> Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Acked-by: Paul Elder <paul.elder@ideasonboard.com> Acked-by: Show Liu <show.liu@linaro.org>
2019-08-19test: Get event dispatcher from current threadLaurent Pinchart
For all tests that don't otherwise require access to the camera manager, get the event dispatcher from the current thread instead of the camera manager. This prepares for the removal of CameraManager::instance(). Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-08-19test: unixsocket: Fix typo in error messageLaurent Pinchart
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-07-04test: Allow self-contained tests to run in parallelNiklas Söderlund
The IPA, IPC and Stream tests are self-contained so they can run in parallel. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-07-02test: ipc: unix: Add test for IPCUnixSocketNiklas Söderlund
Test that the IPC supports sending data and file descriptors over the IPC medium. To be able to execute the test two parts are needed, one to drive the test and act as the libcamera (master) and a one to act as the IPA (slave). The master drives the testing posting requests to the slave to process and sometimes respond to. A few different tests are performed. - Master sends an array to the slave which responds with a reversed copy of the array. The master verifies that a reversed array is returned. - Master tries to send an empty message making sure that the send call fails. - Master sends a list of file descriptors and ask the slave to calculate and respond with the sum of the size of the files. The master verifies that the calculated size is correct. - Master sends a pre-computed size and a list of file descriptors and asks the slave to verify that the pre-computed size matches the sum of the size of the file descriptors. - Master sends two file descriptors and asks the slave to join the file contents in a new file and respond with its file descriptor. The master then verifies that the content of the returned file descriptor matches the order of the original two files. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
generated by cgit v1.2.1 (git 2.18.0) at 2025-01-04 08:53:51 +0000
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2018, Google Inc.
 *
 * Enumeration and matching
 */

#include "libcamera/internal/device_enumerator.h"

#include <string.h>

#include <libcamera/base/log.h>

#include "libcamera/internal/device_enumerator_sysfs.h"
#include "libcamera/internal/device_enumerator_udev.h"
#include "libcamera/internal/media_device.h"

/**
 * \file device_enumerator.h
 * \brief Enumeration and matching of media devices
 *
 * The purpose of device enumeration and matching is to find media devices in
 * the system and map them to pipeline handlers.
 *
 * At the core of the enumeration is the DeviceEnumerator class, responsible
 * for enumerating all media devices in the system. It handles all interactions
 * with the operating system in a platform-specific way. For each media device
 * found an instance of MediaDevice is created to store information about the
 * device gathered from the kernel through the Media Controller API.
 *
 * The DeviceEnumerator can enumerate all or specific media devices in the
 * system. When a new media device is added the enumerator creates a
 * corresponding MediaDevice instance.
 *
 * The enumerator supports searching among enumerated devices based on criteria
 * expressed in a DeviceMatch object.
 */

namespace libcamera {

LOG_DEFINE_CATEGORY(DeviceEnumerator)

/**
 * \class DeviceMatch
 * \brief Description of a media device search pattern
 *
 * The DeviceMatch class describes a media device using properties from the
 * Media Controller struct media_device_info, entity names in the media graph
 * or other properties that can be used to identify a media device.
 *
 * The description is meant to be filled by pipeline managers and passed to a
 * device enumerator to find matching media devices.
 *
 * A DeviceMatch is created with a specific Linux device driver in mind,
 * therefore the name of the driver is a required property. One or more Entity
 * names can be added as match criteria.
 *
 * Pipeline handlers are recommended to add entities to DeviceMatch as
 * appropriate to ensure that the media device they need can be uniquely
 * identified. This is useful when the corresponding kernel driver can produce
 * different graphs, for instance as a result of different driver versions or
 * hardware configurations, and not all those graphs are suitable for a pipeline
 * handler.
 */

/**
 * \brief Construct a media device search pattern
 * \param[in] driver The Linux device driver name that created the media device
 */
DeviceMatch::DeviceMatch(const std::string &driver)
	: driver_(driver)
{
}

/**
 * \brief Add a media entity name to the search pattern
 * \param[in] entity The name of the entity in the media graph
 */
void DeviceMatch::add(const std::string &entity)
{
	entities_.push_back(entity);
}

/**
 * \brief Compare a search pattern with a media device
 * \param[in] device The media device
 *
 * Matching is performed on the Linux device driver name and entity names from
 * the media graph. A match is found if both the driver name matches and the
 * media device contains all the entities listed in the search pattern.
 *
 * \return true if the media device matches the search pattern, false otherwise
 */
bool DeviceMatch::match(const MediaDevice *device) const
{
	if (driver_ != device->driver())
		return false;

	for (const std::string &name : entities_) {
		bool found = false;

		for (const MediaEntity *entity : device->entities()) {
			if (name == entity->name()) {
				if (!entity->deviceNode().empty()) {
					found = true;
					break;
				} else {
					LOG(DeviceEnumerator, Debug)
						<< "Skip " << entity->name()
						<< ": no device node";
				}
			}
		}

		if (!found)
			return false;
	}

	return true;
}

/**
 * \class DeviceEnumerator
 * \brief Enumerate, store and search media devices
 *
 * The DeviceEnumerator class is responsible for all interactions with the
 * operating system related to media devices. It enumerates all media devices
 * in the system, and for each device found creates an instance of the
 * MediaDevice class and stores it internally. The list of media devices can
 * then be searched using DeviceMatch search patterns.
 *
 * The enumerator also associates media device entities with device node paths.
 */

/**
 * \brief Create a new device enumerator matching the systems capabilities
 *
 * Depending on how the operating system handles device detection, hot-plug
 * notification and device node lookup, different device enumerator
 * implementations may be needed. This function creates the best enumerator for
 * the operating system based on the available resources. Not all different
 * enumerator types are guaranteed to support all features.
 *
 * \return A pointer to the newly created device enumerator on success, or
 * nullptr if an error occurs
 */
std::unique_ptr<DeviceEnumerator> DeviceEnumerator::create()
{
	std::unique_ptr<DeviceEnumerator> enumerator;

#ifdef HAVE_LIBUDEV
	enumerator = std::make_unique<DeviceEnumeratorUdev>();
	if (!enumerator->init())
		return enumerator;
#endif

	/*
	 * Either udev is not available or udev initialization failed. Fall back
	 * on the sysfs enumerator.
	 */
	enumerator = std::make_unique<DeviceEnumeratorSysfs>();
	if (!enumerator->init())
		return enumerator;

	return nullptr;
}

DeviceEnumerator::~DeviceEnumerator()
{
	for (const std::shared_ptr<MediaDevice> &media : devices_) {
		if (media->busy())
			LOG(DeviceEnumerator, Error)
				<< "Removing media device " << media->deviceNode()
				<< " while still in use";
	}
}

/**
 * \fn DeviceEnumerator::init()
 * \brief Initialize the enumerator
 * \return 0 on success or a negative error code otherwise
 * \retval -EBUSY the enumerator has already been initialized
 * \retval -ENODEV the enumerator can't enumerate devices
 */

/**
 * \fn DeviceEnumerator::enumerate()
 * \brief Enumerate all media devices in the system
 *
 * This function finds and add all media devices in the system to the
 * enumerator. It shall be implemented by all subclasses of DeviceEnumerator
 * using system-specific methods.
 *
 * Individual media devices that can't be properly enumerated shall be skipped
 * with a warning message logged, without returning an error. Only errors that
 * prevent enumeration altogether shall be fatal.
 *
 * \context This function is \threadbound.
 *
 * \return 0 on success or a negative error code otherwise
 */

/**
 * \brief Create a media device instance
 * \param[in] deviceNode path to the media device to create
 *
 * Create a media device for the \a deviceNode, open it, and populate its
 * media graph. The device enumerator shall then populate the media device by
 * associating device nodes with entities using MediaEntity::setDeviceNode().
 * This process is specific to each device enumerator, and the device enumerator
 * shall ensure that device nodes are ready to be used (for instance, if
 * applicable, by waiting for device nodes to be created and access permissions
 * to be set by the system). Once done, it shall add the media device to the
 * system with addDevice().
 *
 * \return Created media device instance on success, or nullptr otherwise
 */
std::unique_ptr<MediaDevice> DeviceEnumerator::createDevice(const std::string &deviceNode)
{
	std::unique_ptr<MediaDevice> media = std::make_unique<MediaDevice>(deviceNode);

	int ret = media->populate();
	if (ret < 0) {
		LOG(DeviceEnumerator, Info)
			<< "Unable to populate media device " << deviceNode
			<< " (" << strerror(-ret) << "), skipping";
		return nullptr;
	}

	LOG(DeviceEnumerator, Debug)
		<< "New media device \"" << media->driver()
		<< "\" created from " << deviceNode;

	return media;
}

/**
* \var DeviceEnumerator::devicesAdded
* \brief Notify of new media devices being found
*
* This signal is emitted when the device enumerator finds new media devices in
* the system. It may be emitted for every newly detected device, or once for
* multiple devices, at the discretion of the device enumerator. Not all device
* enumerator types may support dynamic detection of new devices.
*/

/**
 * \brief Add a media device to the enumerator
 * \param[in] media media device instance to add
 *
 * Store the media device in the internal list for later matching with
 * pipeline handlers. \a media shall be created with createDevice() first.
 * This function shall be called after all members of the entities of the
 * media graph have been confirmed to be initialized.
 */
void DeviceEnumerator::addDevice(std::unique_ptr<MediaDevice> media)
{
	LOG(DeviceEnumerator, Debug)
		<< "Added device " << media->deviceNode() << ": " << media->driver();

	devices_.push_back(std::move(media));

	/* \todo To batch multiple additions, emit with a small delay here. */
	devicesAdded.emit();
}

/**
 * \brief Remove a media device from the enumerator
 * \param[in] deviceNode Path to the media device to remove
 *
 * Remove the media device identified by \a deviceNode previously added to the
 * enumerator with addDevice(). The media device's MediaDevice::disconnected
 * signal is emitted.
 */
void DeviceEnumerator::removeDevice(const std::string &deviceNode)
{
	std::shared_ptr<MediaDevice> media;

	for (auto iter = devices_.begin(); iter != devices_.end(); ++iter) {
		if ((*iter)->deviceNode() == deviceNode) {
			media = std::move(*iter);
			devices_.erase(iter);
			break;
		}
	}

	if (!media) {
		LOG(DeviceEnumerator, Warning)
			<< "Media device for node " << deviceNode
			<< " not found";
		return;
	}

	LOG(DeviceEnumerator, Debug)
		<< "Media device for node " << deviceNode << " removed.";

	media->disconnected.emit();
}

/**
 * \brief Search available media devices for a pattern match
 * \param[in] dm Search pattern
 *
 * Search in the enumerated media devices that are not already in use for a
 * match described in \a dm. If a match is found and the caller intends to use
 * it the caller is responsible for acquiring the MediaDevice object and
 * releasing it when done with it.
 *
 * \return pointer to the matching MediaDevice, or nullptr if no match is found
 */
std::shared_ptr<MediaDevice> DeviceEnumerator::search(const DeviceMatch &dm)
{
	for (std::shared_ptr<MediaDevice> &media : devices_) {
		if (media->busy())
			continue;

		if (dm.match(media.get())) {
			LOG(DeviceEnumerator, Debug)
				<< "Successful match for media device \""
				<< media->driver() << "\"";
			return media;
		}
	}

	return nullptr;
}

} /* namespace libcamera */
generated by cgit v1.2.1 (git 2.18.0) at 2025-01-04 08:53:50 +0000