mirror of
https://github.com/RGBCube/serenity
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ed6c1f53af
This ensures we safely handle interrupts (which can call virtual functions), so they don't happen in the constructor - this pattern can lead to a crash, if we are still in the constructor context because not all methods are available for usage (some are pure virtual, so it's possible to call __cxa_pure_virtual). Also, under some conditions like adding a PCI device via PCI-passthrough mechanism in QEMU, it became exposed to the eye that the code asserts on RNG::handle_device_config_change(). That device has no configuration but if the hypervisor still misbehaves and tries to configure it, we should simply return false to indicate nothing happened.
298 lines
12 KiB
C++
298 lines
12 KiB
C++
/*
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* Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/BinaryBufferWriter.h>
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#include <Kernel/Graphics/VirtIOGPU/Console.h>
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#include <Kernel/Graphics/VirtIOGPU/FrameBufferDevice.h>
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#include <Kernel/Graphics/VirtIOGPU/GPU.h>
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#define DEVICE_EVENTS_READ 0x0
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#define DEVICE_EVENTS_CLEAR 0x4
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#define DEVICE_NUM_SCANOUTS 0x8
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namespace Kernel::Graphics::VirtIOGPU {
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void GPU::initialize()
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{
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Device::initialize();
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VERIFY(!!m_scratch_space);
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if (auto cfg = get_config(VirtIO::ConfigurationType::Device)) {
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m_device_configuration = cfg;
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bool success = negotiate_features([&](u64 supported_features) {
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u64 negotiated = 0;
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if (is_feature_set(supported_features, VIRTIO_GPU_F_VIRGL))
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dbgln_if(VIRTIO_DEBUG, "GPU: VIRGL is not yet supported!");
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if (is_feature_set(supported_features, VIRTIO_GPU_F_EDID))
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dbgln_if(VIRTIO_DEBUG, "GPU: EDID is not yet supported!");
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return negotiated;
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});
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if (success) {
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read_config_atomic([&]() {
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m_num_scanouts = config_read32(*cfg, DEVICE_NUM_SCANOUTS);
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});
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dbgln_if(VIRTIO_DEBUG, "GPU: num_scanouts: {}", m_num_scanouts);
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success = setup_queues(2); // CONTROLQ + CURSORQ
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}
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VERIFY(success);
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finish_init();
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MutexLocker locker(m_operation_lock);
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// Get display information using VIRTIO_GPU_CMD_GET_DISPLAY_INFO
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query_display_information();
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} else {
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VERIFY_NOT_REACHED();
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}
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}
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GPU::GPU(PCI::Address address)
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: VirtIO::Device(address)
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, m_scratch_space(MM.allocate_contiguous_kernel_region(32 * PAGE_SIZE, "VirtGPU Scratch Space", Memory::Region::Access::ReadWrite))
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{
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}
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GPU::~GPU()
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{
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}
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void GPU::create_framebuffer_devices()
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{
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for (size_t i = 0; i < min(m_num_scanouts, VIRTIO_GPU_MAX_SCANOUTS); i++) {
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auto& scanout = m_scanouts[i];
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scanout.framebuffer = adopt_ref(*new VirtIOGPU::FrameBufferDevice(*this, i));
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scanout.console = Kernel::Graphics::VirtIOGPU::Console::initialize(scanout.framebuffer);
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}
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}
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bool GPU::handle_device_config_change()
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{
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auto events = get_pending_events();
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if (events & VIRTIO_GPU_EVENT_DISPLAY) {
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// The host window was resized, in SerenityOS we completely ignore this event
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dbgln_if(VIRTIO_DEBUG, "VirtIO::GPU: Ignoring virtio gpu display resize event");
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clear_pending_events(VIRTIO_GPU_EVENT_DISPLAY);
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}
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if (events & ~VIRTIO_GPU_EVENT_DISPLAY) {
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dbgln("GPU: Got unknown device config change event: {:#x}", events);
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return false;
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}
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return true;
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}
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void GPU::handle_queue_update(u16 queue_index)
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{
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dbgln_if(VIRTIO_DEBUG, "GPU: Handle queue update");
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VERIFY(queue_index == CONTROLQ);
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auto& queue = get_queue(CONTROLQ);
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SpinlockLocker queue_lock(queue.lock());
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queue.discard_used_buffers();
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m_outstanding_request.wake_all();
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}
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u32 GPU::get_pending_events()
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{
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return config_read32(*m_device_configuration, DEVICE_EVENTS_READ);
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}
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void GPU::clear_pending_events(u32 event_bitmask)
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{
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config_write32(*m_device_configuration, DEVICE_EVENTS_CLEAR, event_bitmask);
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}
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void GPU::query_display_information()
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request, Protocol::CommandType::VIRTIO_GPU_CMD_GET_DISPLAY_INFO, VIRTIO_GPU_FLAG_FENCE);
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auto& response = writer.append_structure<Protocol::DisplayInfoResponse>();
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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for (size_t i = 0; i < VIRTIO_GPU_MAX_SCANOUTS; ++i) {
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auto& scanout = m_scanouts[i].display_info;
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scanout = response.scanout_modes[i];
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dbgln_if(VIRTIO_DEBUG, "GPU: Scanout {}: enabled: {} x: {}, y: {}, width: {}, height: {}", i, !!scanout.enabled, scanout.rect.x, scanout.rect.y, scanout.rect.width, scanout.rect.height);
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if (scanout.enabled && !m_default_scanout.has_value())
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m_default_scanout = i;
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}
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VERIFY(m_default_scanout.has_value());
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}
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ResourceID GPU::create_2d_resource(Protocol::Rect rect)
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::ResourceCreate2D>();
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_RESOURCE_CREATE_2D, VIRTIO_GPU_FLAG_FENCE);
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auto resource_id = allocate_resource_id();
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request.resource_id = resource_id.value();
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request.width = rect.width;
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request.height = rect.height;
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request.format = static_cast<u32>(Protocol::TextureFormat::VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM);
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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dbgln_if(VIRTIO_DEBUG, "GPU: Allocated 2d resource with id {}", resource_id.value());
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return resource_id;
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}
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void GPU::ensure_backing_storage(Memory::Region const& region, size_t buffer_offset, size_t buffer_length, ResourceID resource_id)
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{
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VERIFY(m_operation_lock.is_locked());
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VERIFY(buffer_offset % PAGE_SIZE == 0);
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VERIFY(buffer_length % PAGE_SIZE == 0);
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auto first_page_index = buffer_offset / PAGE_SIZE;
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size_t num_mem_regions = buffer_length / PAGE_SIZE;
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// Send request
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::ResourceAttachBacking>();
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const size_t header_block_size = sizeof(request) + num_mem_regions * sizeof(Protocol::MemoryEntry);
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING, VIRTIO_GPU_FLAG_FENCE);
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request.resource_id = resource_id.value();
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request.num_entries = num_mem_regions;
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for (size_t i = 0; i < num_mem_regions; ++i) {
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auto& memory_entry = writer.append_structure<Protocol::MemoryEntry>();
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memory_entry.address = region.physical_page(first_page_index + i)->paddr().get();
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memory_entry.length = PAGE_SIZE;
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}
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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synchronous_virtio_gpu_command(start_of_scratch_space(), header_block_size, sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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dbgln_if(VIRTIO_DEBUG, "GPU: Allocated backing storage");
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}
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void GPU::detach_backing_storage(ResourceID resource_id)
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::ResourceDetachBacking>();
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING, VIRTIO_GPU_FLAG_FENCE);
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request.resource_id = resource_id.value();
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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dbgln_if(VIRTIO_DEBUG, "GPU: Detached backing storage");
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}
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void GPU::set_scanout_resource(ScanoutID scanout, ResourceID resource_id, Protocol::Rect rect)
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::SetScanOut>();
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_SET_SCANOUT, VIRTIO_GPU_FLAG_FENCE);
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request.resource_id = resource_id.value();
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request.scanout_id = scanout.value();
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request.rect = rect;
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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dbgln_if(VIRTIO_DEBUG, "GPU: Set backing scanout");
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}
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void GPU::transfer_framebuffer_data_to_host(ScanoutID scanout, Protocol::Rect const& dirty_rect, ResourceID resource_id)
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::TransferToHost2D>();
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D, VIRTIO_GPU_FLAG_FENCE);
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request.offset = (dirty_rect.x + (dirty_rect.y * m_scanouts[scanout.value()].display_info.rect.width)) * sizeof(u32);
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request.resource_id = resource_id.value();
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request.rect = dirty_rect;
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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}
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void GPU::flush_displayed_image(Protocol::Rect const& dirty_rect, ResourceID resource_id)
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::ResourceFlush>();
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_RESOURCE_FLUSH, VIRTIO_GPU_FLAG_FENCE);
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request.resource_id = resource_id.value();
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request.rect = dirty_rect;
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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}
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void GPU::synchronous_virtio_gpu_command(PhysicalAddress buffer_start, size_t request_size, size_t response_size)
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{
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VERIFY(m_operation_lock.is_locked());
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VERIFY(m_outstanding_request.is_empty());
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auto& queue = get_queue(CONTROLQ);
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{
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SpinlockLocker lock(queue.lock());
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VirtIO::QueueChain chain { queue };
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chain.add_buffer_to_chain(buffer_start, request_size, VirtIO::BufferType::DeviceReadable);
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chain.add_buffer_to_chain(buffer_start.offset(request_size), response_size, VirtIO::BufferType::DeviceWritable);
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supply_chain_and_notify(CONTROLQ, chain);
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full_memory_barrier();
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}
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m_outstanding_request.wait_forever();
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}
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void GPU::populate_virtio_gpu_request_header(Protocol::ControlHeader& header, Protocol::CommandType ctrl_type, u32 flags)
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{
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header.type = static_cast<u32>(ctrl_type);
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header.flags = flags;
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header.fence_id = 0;
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header.context_id = 0;
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header.padding = 0;
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}
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void GPU::flush_dirty_rectangle(ScanoutID scanout_id, Protocol::Rect const& dirty_rect, ResourceID resource_id)
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{
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MutexLocker locker(m_operation_lock);
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transfer_framebuffer_data_to_host(scanout_id, dirty_rect, resource_id);
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flush_displayed_image(dirty_rect, resource_id);
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}
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ResourceID GPU::allocate_resource_id()
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{
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VERIFY(m_operation_lock.is_locked());
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m_resource_id_counter = m_resource_id_counter.value() + 1;
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return m_resource_id_counter;
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}
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void GPU::delete_resource(ResourceID resource_id)
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{
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VERIFY(m_operation_lock.is_locked());
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auto writer = create_scratchspace_writer();
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auto& request = writer.append_structure<Protocol::ResourceUnref>();
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auto& response = writer.append_structure<Protocol::ControlHeader>();
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populate_virtio_gpu_request_header(request.header, Protocol::CommandType::VIRTIO_GPU_CMD_RESOURCE_UNREF, VIRTIO_GPU_FLAG_FENCE);
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request.resource_id = resource_id.value();
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synchronous_virtio_gpu_command(start_of_scratch_space(), sizeof(request), sizeof(response));
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VERIFY(response.type == static_cast<u32>(Protocol::CommandType::VIRTIO_GPU_RESP_OK_NODATA));
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}
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}
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