cam: Add DRM helper classes
To prepare for viewfinder operation through the DRM/KMS API, add a set of helper classes that encapsulate the libdrm functions. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Laurent Pinchart
663
src/cam/drm.cpp
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663
src/cam/drm.cpp
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@@ -0,0 +1,663 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2021, Ideas on Board Oy
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*
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* drm.cpp - DRM/KMS Helpers
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*/
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#include "drm.h"
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#include <algorithm>
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#include <errno.h>
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#include <fcntl.h>
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#include <iostream>
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#include <set>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <libcamera/framebuffer.h>
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#include <libcamera/geometry.h>
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#include <libcamera/pixel_format.h>
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#include <libdrm/drm_mode.h>
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#include "event_loop.h"
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namespace DRM {
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Object::Object(Device *dev, uint32_t id, Type type)
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: id_(id), dev_(dev), type_(type)
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{
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/* Retrieve properties from the objects that support them. */
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if (type != TypeConnector && type != TypeCrtc &&
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type != TypeEncoder && type != TypePlane)
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return;
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/*
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* We can't distinguish between failures due to the object having no
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* property and failures due to other conditions. Assume we use the API
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* correctly and consider the object has no property.
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*/
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drmModeObjectProperties *properties = drmModeObjectGetProperties(dev->fd(), id, type);
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if (!properties)
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return;
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properties_.reserve(properties->count_props);
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for (uint32_t i = 0; i < properties->count_props; ++i)
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properties_.emplace_back(properties->props[i],
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properties->prop_values[i]);
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drmModeFreeObjectProperties(properties);
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}
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Object::~Object()
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{
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}
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const Property *Object::property(const std::string &name) const
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{
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for (const PropertyValue &pv : properties_) {
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const Property *property = static_cast<const Property *>(dev_->object(pv.id()));
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if (property && property->name() == name)
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return property;
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}
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return nullptr;
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}
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const PropertyValue *Object::propertyValue(const std::string &name) const
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{
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for (const PropertyValue &pv : properties_) {
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const Property *property = static_cast<const Property *>(dev_->object(pv.id()));
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if (property && property->name() == name)
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return &pv;
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}
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return nullptr;
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}
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Property::Property(Device *dev, drmModePropertyRes *property)
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: Object(dev, property->prop_id, TypeProperty),
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name_(property->name), flags_(property->flags),
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values_(property->values, property->values + property->count_values),
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blobs_(property->blob_ids, property->blob_ids + property->count_blobs)
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{
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if (drm_property_type_is(property, DRM_MODE_PROP_RANGE))
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type_ = TypeRange;
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else if (drm_property_type_is(property, DRM_MODE_PROP_ENUM))
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type_ = TypeEnum;
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else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
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type_ = TypeBlob;
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else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK))
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type_ = TypeBitmask;
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else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT))
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type_ = TypeObject;
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else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE))
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type_ = TypeSignedRange;
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else
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type_ = TypeUnknown;
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for (int i = 0; i < property->count_enums; ++i)
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enums_[property->enums[i].value] = property->enums[i].name;
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}
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Blob::Blob(Device *dev, const libcamera::Span<const uint8_t> &data)
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: Object(dev, 0, Object::TypeBlob)
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{
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drmModeCreatePropertyBlob(dev->fd(), data.data(), data.size(), &id_);
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}
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Blob::~Blob()
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{
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if (isValid())
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drmModeDestroyPropertyBlob(device()->fd(), id());
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}
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Mode::Mode(const drmModeModeInfo &mode)
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: drmModeModeInfo(mode)
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{
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}
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std::unique_ptr<Blob> Mode::toBlob(Device *dev) const
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{
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libcamera::Span<const uint8_t> data{ reinterpret_cast<const uint8_t *>(this),
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sizeof(*this) };
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return std::make_unique<Blob>(dev, data);
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}
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Crtc::Crtc(Device *dev, const drmModeCrtc *crtc, unsigned int index)
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: Object(dev, crtc->crtc_id, Object::TypeCrtc), index_(index)
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{
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}
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Encoder::Encoder(Device *dev, const drmModeEncoder *encoder)
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: Object(dev, encoder->encoder_id, Object::TypeEncoder),
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type_(encoder->encoder_type)
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{
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const std::list<Crtc> &crtcs = dev->crtcs();
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possibleCrtcs_.reserve(crtcs.size());
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for (const Crtc &crtc : crtcs) {
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if (encoder->possible_crtcs & (1 << crtc.index()))
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possibleCrtcs_.push_back(&crtc);
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}
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possibleCrtcs_.shrink_to_fit();
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}
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namespace {
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const std::map<uint32_t, const char *> connectorTypeNames{
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{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
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{ DRM_MODE_CONNECTOR_VGA, "VGA" },
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{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
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{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
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{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
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{ DRM_MODE_CONNECTOR_Composite, "Composite" },
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{ DRM_MODE_CONNECTOR_SVIDEO, "S-Video" },
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{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
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{ DRM_MODE_CONNECTOR_Component, "Component" },
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{ DRM_MODE_CONNECTOR_9PinDIN, "9-Pin-DIN" },
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{ DRM_MODE_CONNECTOR_DisplayPort, "DP" },
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{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
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{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
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{ DRM_MODE_CONNECTOR_TV, "TV" },
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{ DRM_MODE_CONNECTOR_eDP, "eDP" },
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{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
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{ DRM_MODE_CONNECTOR_DSI, "DSI" },
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{ DRM_MODE_CONNECTOR_DPI, "DPI" },
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};
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} /* namespace */
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Connector::Connector(Device *dev, const drmModeConnector *connector)
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: Object(dev, connector->connector_id, Object::TypeConnector),
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type_(connector->connector_type)
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{
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auto typeName = connectorTypeNames.find(connector->connector_type);
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if (typeName == connectorTypeNames.end()) {
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std::cerr
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<< "Invalid connector type "
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<< connector->connector_type << std::endl;
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typeName = connectorTypeNames.find(DRM_MODE_CONNECTOR_Unknown);
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}
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name_ = std::string(typeName->second) + "-"
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+ std::to_string(connector->connector_type_id);
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switch (connector->connection) {
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case DRM_MODE_CONNECTED:
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status_ = Status::Connected;
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break;
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case DRM_MODE_DISCONNECTED:
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status_ = Status::Disconnected;
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break;
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case DRM_MODE_UNKNOWNCONNECTION:
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default:
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status_ = Status::Unknown;
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break;
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}
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const std::list<Encoder> &encoders = dev->encoders();
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encoders_.reserve(connector->count_encoders);
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for (int i = 0; i < connector->count_encoders; ++i) {
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uint32_t encoderId = connector->encoders[i];
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auto encoder = std::find_if(encoders.begin(), encoders.end(),
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[=](const Encoder &e) {
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return e.id() == encoderId;
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});
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if (encoder == encoders.end()) {
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std::cerr
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<< "Encoder " << encoderId << " not found"
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<< std::endl;
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continue;
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}
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encoders_.push_back(&*encoder);
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}
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encoders_.shrink_to_fit();
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modes_ = { connector->modes, connector->modes + connector->count_modes };
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}
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Plane::Plane(Device *dev, const drmModePlane *plane)
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: Object(dev, plane->plane_id, Object::TypePlane),
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possibleCrtcsMask_(plane->possible_crtcs)
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{
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formats_ = { plane->formats, plane->formats + plane->count_formats };
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const std::list<Crtc> &crtcs = dev->crtcs();
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possibleCrtcs_.reserve(crtcs.size());
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for (const Crtc &crtc : crtcs) {
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if (plane->possible_crtcs & (1 << crtc.index()))
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possibleCrtcs_.push_back(&crtc);
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}
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possibleCrtcs_.shrink_to_fit();
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}
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bool Plane::supportsFormat(const libcamera::PixelFormat &format) const
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{
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return std::find(formats_.begin(), formats_.end(), format.fourcc())
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!= formats_.end();
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}
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int Plane::setup()
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{
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const PropertyValue *pv = propertyValue("type");
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if (!pv)
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return -EINVAL;
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switch (pv->value()) {
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case DRM_PLANE_TYPE_OVERLAY:
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type_ = TypeOverlay;
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break;
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case DRM_PLANE_TYPE_PRIMARY:
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type_ = TypePrimary;
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break;
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case DRM_PLANE_TYPE_CURSOR:
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type_ = TypeCursor;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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FrameBuffer::FrameBuffer(Device *dev)
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: Object(dev, 0, Object::TypeFb)
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{
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}
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FrameBuffer::~FrameBuffer()
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{
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for (FrameBuffer::Plane &plane : planes_) {
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struct drm_gem_close gem_close = {
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.handle = plane.handle,
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.pad = 0,
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};
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int ret;
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do {
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ret = ioctl(device()->fd(), DRM_IOCTL_GEM_CLOSE, &gem_close);
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} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
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if (ret == -1) {
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ret = -errno;
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std::cerr
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<< "Failed to close GEM object: "
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<< strerror(-ret) << std::endl;
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}
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}
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drmModeRmFB(device()->fd(), id());
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}
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AtomicRequest::AtomicRequest(Device *dev)
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: dev_(dev), valid_(true)
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{
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request_ = drmModeAtomicAlloc();
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if (!request_)
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valid_ = false;
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}
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AtomicRequest::~AtomicRequest()
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{
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if (request_)
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drmModeAtomicFree(request_);
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}
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int AtomicRequest::addProperty(const Object *object, const std::string &property,
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uint64_t value)
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{
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if (!valid_)
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return -EINVAL;
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const Property *prop = object->property(property);
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if (!prop) {
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valid_ = false;
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return -EINVAL;
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}
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return addProperty(object->id(), prop->id(), value);
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}
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int AtomicRequest::addProperty(const Object *object, const std::string &property,
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std::unique_ptr<Blob> blob)
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{
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if (!valid_)
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return -EINVAL;
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const Property *prop = object->property(property);
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if (!prop) {
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valid_ = false;
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return -EINVAL;
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}
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int ret = addProperty(object->id(), prop->id(), blob->id());
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if (ret < 0)
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return ret;
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blobs_.emplace_back(std::move(blob));
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return 0;
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}
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int AtomicRequest::addProperty(uint32_t object, uint32_t property, uint64_t value)
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{
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int ret = drmModeAtomicAddProperty(request_, object, property, value);
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if (ret < 0) {
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valid_ = false;
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return ret;
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}
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return 0;
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}
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int AtomicRequest::commit(unsigned int flags)
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{
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if (!valid_)
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return -EINVAL;
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uint32_t drmFlags = 0;
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if (flags & FlagAllowModeset)
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drmFlags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
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if (flags & FlagAsync)
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drmFlags |= DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_ATOMIC_NONBLOCK;
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return drmModeAtomicCommit(dev_->fd(), request_, drmFlags, this);
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}
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Device::Device()
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: fd_(-1)
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{
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}
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Device::~Device()
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{
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if (fd_ != -1)
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drmClose(fd_);
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}
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int Device::init()
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{
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constexpr size_t NODE_NAME_MAX = sizeof("/dev/dri/card255");
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char name[NODE_NAME_MAX];
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int ret;
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/*
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* Open the first DRM/KMS device. The libdrm drmOpen*() functions
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* require either a module name or a bus ID, which we don't have, so
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* bypass them. The automatic module loading and device node creation
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* from drmOpen() is of no practical use as any modern system will
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* handle that through udev or an equivalent component.
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*/
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snprintf(name, sizeof(name), "/dev/dri/card%u", 0);
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fd_ = open(name, O_RDWR | O_CLOEXEC);
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if (fd_ < 0) {
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ret = -errno;
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std::cerr
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<< "Failed to open DRM/KMS device " << name << ": "
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<< strerror(-ret) << std::endl;
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return ret;
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}
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/*
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* Enable the atomic APIs. This also automatically enables the
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* universal planes API.
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*/
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ret = drmSetClientCap(fd_, DRM_CLIENT_CAP_ATOMIC, 1);
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if (ret < 0) {
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ret = -errno;
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std::cerr
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<< "Failed to enable atomic capability: "
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<< strerror(-ret) << std::endl;
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return ret;
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}
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/* List all the resources. */
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ret = getResources();
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if (ret < 0)
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return ret;
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EventLoop::instance()->addEvent(fd_, EventLoop::Read,
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std::bind(&Device::drmEvent, this));
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return 0;
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}
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int Device::getResources()
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{
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int ret;
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std::unique_ptr<drmModeRes, decltype(&drmModeFreeResources)> resources{
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drmModeGetResources(fd_),
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&drmModeFreeResources
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};
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if (!resources) {
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ret = -errno;
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std::cerr
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<< "Failed to get DRM/KMS resources: "
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<< strerror(-ret) << std::endl;
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return ret;
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}
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for (int i = 0; i < resources->count_crtcs; ++i) {
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drmModeCrtc *crtc = drmModeGetCrtc(fd_, resources->crtcs[i]);
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if (!crtc) {
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ret = -errno;
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std::cerr
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<< "Failed to get CRTC: " << strerror(-ret)
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<< std::endl;
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return ret;
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}
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crtcs_.emplace_back(this, crtc, i);
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drmModeFreeCrtc(crtc);
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Crtc &obj = crtcs_.back();
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objects_[obj.id()] = &obj;
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}
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for (int i = 0; i < resources->count_encoders; ++i) {
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drmModeEncoder *encoder =
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drmModeGetEncoder(fd_, resources->encoders[i]);
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if (!encoder) {
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ret = -errno;
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std::cerr
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<< "Failed to get encoder: " << strerror(-ret)
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<< std::endl;
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return ret;
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}
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encoders_.emplace_back(this, encoder);
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drmModeFreeEncoder(encoder);
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Encoder &obj = encoders_.back();
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objects_[obj.id()] = &obj;
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}
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for (int i = 0; i < resources->count_connectors; ++i) {
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drmModeConnector *connector =
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drmModeGetConnector(fd_, resources->connectors[i]);
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if (!connector) {
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ret = -errno;
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std::cerr
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<< "Failed to get connector: " << strerror(-ret)
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<< std::endl;
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return ret;
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}
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connectors_.emplace_back(this, connector);
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drmModeFreeConnector(connector);
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Connector &obj = connectors_.back();
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objects_[obj.id()] = &obj;
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}
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|
||||
std::unique_ptr<drmModePlaneRes, decltype(&drmModeFreePlaneResources)> planes{
|
||||
drmModeGetPlaneResources(fd_),
|
||||
&drmModeFreePlaneResources
|
||||
};
|
||||
if (!planes) {
|
||||
ret = -errno;
|
||||
std::cerr
|
||||
<< "Failed to get DRM/KMS planes: "
|
||||
<< strerror(-ret) << std::endl;
|
||||
return ret;
|
||||
}
|
||||
|
||||
for (uint32_t i = 0; i < planes->count_planes; ++i) {
|
||||
drmModePlane *plane =
|
||||
drmModeGetPlane(fd_, planes->planes[i]);
|
||||
if (!plane) {
|
||||
ret = -errno;
|
||||
std::cerr
|
||||
<< "Failed to get plane: " << strerror(-ret)
|
||||
<< std::endl;
|
||||
return ret;
|
||||
}
|
||||
|
||||
planes_.emplace_back(this, plane);
|
||||
drmModeFreePlane(plane);
|
||||
|
||||
Plane &obj = planes_.back();
|
||||
objects_[obj.id()] = &obj;
|
||||
}
|
||||
|
||||
/* Set the possible planes for each CRTC. */
|
||||
for (Crtc &crtc : crtcs_) {
|
||||
for (const Plane &plane : planes_) {
|
||||
if (plane.possibleCrtcsMask_ & (1 << crtc.index()))
|
||||
crtc.planes_.push_back(&plane);
|
||||
}
|
||||
}
|
||||
|
||||
/* Collect all property IDs and create Property instances. */
|
||||
std::set<uint32_t> properties;
|
||||
for (const auto &object : objects_) {
|
||||
for (const PropertyValue &value : object.second->properties())
|
||||
properties.insert(value.id());
|
||||
}
|
||||
|
||||
for (uint32_t id : properties) {
|
||||
drmModePropertyRes *property = drmModeGetProperty(fd_, id);
|
||||
if (!property) {
|
||||
ret = -errno;
|
||||
std::cerr
|
||||
<< "Failed to get property: " << strerror(-ret)
|
||||
<< std::endl;
|
||||
continue;
|
||||
}
|
||||
|
||||
properties_.emplace_back(this, property);
|
||||
drmModeFreeProperty(property);
|
||||
|
||||
Property &obj = properties_.back();
|
||||
objects_[obj.id()] = &obj;
|
||||
}
|
||||
|
||||
/* Finally, perform all delayed setup of mode objects. */
|
||||
for (auto &object : objects_) {
|
||||
ret = object.second->setup();
|
||||
if (ret < 0) {
|
||||
std::cerr
|
||||
<< "Failed to setup object " << object.second->id()
|
||||
<< ": " << strerror(-ret) << std::endl;
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
const Object *Device::object(uint32_t id)
|
||||
{
|
||||
const auto iter = objects_.find(id);
|
||||
if (iter == objects_.end())
|
||||
return nullptr;
|
||||
|
||||
return iter->second;
|
||||
}
|
||||
|
||||
std::unique_ptr<FrameBuffer> Device::createFrameBuffer(
|
||||
const libcamera::FrameBuffer &buffer,
|
||||
const libcamera::PixelFormat &format,
|
||||
const libcamera::Size &size, unsigned int stride)
|
||||
{
|
||||
std::unique_ptr<FrameBuffer> fb{ new FrameBuffer(this) };
|
||||
|
||||
uint32_t handles[4] = {};
|
||||
uint32_t pitches[4] = {};
|
||||
uint32_t offsets[4] = {};
|
||||
int ret;
|
||||
|
||||
const std::vector<libcamera::FrameBuffer::Plane> &planes = buffer.planes();
|
||||
fb->planes_.reserve(planes.size());
|
||||
|
||||
unsigned int i = 0;
|
||||
for (const libcamera::FrameBuffer::Plane &plane : planes) {
|
||||
uint32_t handle;
|
||||
|
||||
ret = drmPrimeFDToHandle(fd_, plane.fd.fd(), &handle);
|
||||
if (ret < 0) {
|
||||
ret = -errno;
|
||||
std::cerr
|
||||
<< "Unable to import framebuffer dmabuf: "
|
||||
<< strerror(-ret) << std::endl;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
fb->planes_.push_back({ handle });
|
||||
|
||||
handles[i] = handle;
|
||||
pitches[i] = stride;
|
||||
offsets[i] = 0; /* TODO */
|
||||
++i;
|
||||
}
|
||||
|
||||
ret = drmModeAddFB2(fd_, size.width, size.height, format.fourcc(), handles,
|
||||
pitches, offsets, &fb->id_, 0);
|
||||
if (ret < 0) {
|
||||
ret = -errno;
|
||||
std::cerr
|
||||
<< "Failed to add framebuffer: "
|
||||
<< strerror(-ret) << std::endl;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
return fb;
|
||||
}
|
||||
|
||||
void Device::drmEvent()
|
||||
{
|
||||
drmEventContext ctx{};
|
||||
ctx.version = DRM_EVENT_CONTEXT_VERSION;
|
||||
ctx.page_flip_handler = &Device::pageFlipComplete;
|
||||
|
||||
drmHandleEvent(fd_, &ctx);
|
||||
}
|
||||
|
||||
void Device::pageFlipComplete([[maybe_unused]] int fd,
|
||||
[[maybe_unused]] unsigned int sequence,
|
||||
[[maybe_unused]] unsigned int tv_sec,
|
||||
[[maybe_unused]] unsigned int tv_usec,
|
||||
void *user_data)
|
||||
{
|
||||
AtomicRequest *request = static_cast<AtomicRequest *>(user_data);
|
||||
request->device()->requestComplete.emit(request);
|
||||
}
|
||||
|
||||
} /* namespace DRM */
|
||||
Reference in New Issue
Block a user