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add platform device

Signed-off-by: Pascal Bauer <pascal.bauer@rwth-aachen.de>
This commit is contained in:
Pascal Bauer 2024-08-24 12:36:56 +02:00
parent dca4d4c66a
commit 9d6b81b15a
2 changed files with 106 additions and 0 deletions

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/* Platform Device
*
* Author: Pascal Bauer <pascal.bauer@rwth-aachen.de>
*
* SPDX-FileCopyrightText: 2023-2024 Pascal Bauer <pascal.bauer@rwth-aachen.de>
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <filesystem>
#include <villas/kernel/devices/device.hpp>
#include <villas/kernel/devices/driver.hpp>
#include <villas/kernel/devices/utils.hpp>
namespace villas {
namespace kernel {
namespace devices {
class PlatformDevice : public Device {
private:
static constexpr char PROBE_DEFAULT[] = "/sys/bus/platform/drivers_probe";
static constexpr char OVERRIDE_DEFAULT[] = "driver_override";
private:
const std::filesystem::path m_path;
const std::filesystem::path m_probe_path;
const std::filesystem::path m_override_path;
public:
PlatformDevice(const std::filesystem::path path)
: PlatformDevice(path, std::filesystem::path(PROBE_DEFAULT),
path / std::filesystem::path(OVERRIDE_DEFAULT)){};
PlatformDevice(const std::filesystem::path path,
const std::filesystem::path probe_path,
const std::filesystem::path override_path)
: m_path(path), m_probe_path(probe_path),
m_override_path(override_path){};
// Implement device interface
std::optional<std::unique_ptr<Driver>> driver() const override;
std::optional<int> iommu_group() const override;
std::string name() const override;
std::filesystem::path override_path() const override;
std::filesystem::path path() const override;
void probe() const override;
};
} // namespace devices
} // namespace kernel
} // namespace villas

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/* Platform Device
*
* Author: Pascal Bauer <pascal.bauer@rwth-aachen.de>
*
* SPDX-FileCopyrightText: 2023-2024 Pascal Bauer <pascal.bauer@rwth-aachen.de>
* SPDX-License-Identifier: Apache-2.0
*/
#include <villas/kernel/devices/platform_device.hpp>
#include <villas/kernel/devices/generic_driver.hpp>
using villas::kernel::devices::Driver, villas::kernel::devices::GenericDriver;
using villas::kernel::devices::PlatformDevice;
using villas::kernel::devices::utils::write_to_file;
std::optional<std::unique_ptr<Driver>> PlatformDevice::driver() const {
std::filesystem::path driver_symlink =
this->m_path / std::filesystem::path("driver");
if (!std::filesystem::is_symlink(driver_symlink))
return std::nullopt;
std::filesystem::path driver_path =
std::filesystem::canonical(driver_symlink);
return std::make_optional(std::make_unique<GenericDriver>(driver_path));
}
std::optional<int> PlatformDevice::iommu_group() const {
std::filesystem::path symlink =
std::filesystem::path(this->m_path.u8string() + "/iommu_group");
std::filesystem::path link;
link = std::filesystem::read_symlink(symlink);
std::string delimiter = "iommu_groups/";
int pos = link.u8string().find(delimiter);
int iommu_group = std::stoi(link.u8string().substr(pos + delimiter.length()));
return std::make_optional<int>(iommu_group);
}
std::filesystem::path PlatformDevice::path() const { return this->m_path; };
void PlatformDevice::probe() const {
write_to_file(this->name(), this->m_probe_path);
}
std::filesystem::path PlatformDevice::override_path() const {
return this->m_override_path;
}
std::string PlatformDevice::name() const {
size_t pos = this->m_path.u8string().rfind('/');
return this->m_path.u8string().substr(pos + 1);
}