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Kernel: Implement basic VirGL device
This commit flips VirtIOGPU back to using a Mutex for its operation lock (instead of a spinlock). This is necessary for avoiding a few system hangs when queuing actions on the driver from multiple processes, which becomes much more of an issue when using VirGL from multiple userspace process. This does result in a few code paths where we inevitably have to grab a mutex from inside a spinlock, the only way to fix both issues is to move to issuing asynchronous virtio gpu commands.
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7 changed files with 503 additions and 8 deletions
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@ -19,6 +19,8 @@
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namespace Kernel::Graphics::VirtIOGPU {
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class GPU3DDevice;
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#define VIRTIO_GPU_F_VIRGL (1 << 0)
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#define VIRTIO_GPU_F_EDID (1 << 1)
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@ -47,6 +49,7 @@ public:
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virtual bool vga_compatible() const override { return false; }
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virtual void initialize() override;
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void initialize_3d_device();
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ErrorOr<ByteBuffer> get_edid(size_t output_port_index) const override;
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@ -109,8 +112,15 @@ private:
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u32 get_pending_events();
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void clear_pending_events(u32 event_bitmask);
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// 3D Command stuff
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ContextID create_context();
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void attach_resource_to_context(ResourceID resource_id, ContextID context_id);
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void submit_command_buffer(ContextID, Function<size_t(Bytes)> buffer_writer);
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Protocol::TextureFormat get_framebuffer_format() const { return Protocol::TextureFormat::VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM; }
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auto& operation_lock() { return m_operation_lock; }
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ResourceID allocate_resource_id();
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ContextID allocate_context_id();
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PhysicalAddress start_of_scratch_space() const { return m_scratch_space->physical_page(0)->paddr(); }
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AK::BinaryBufferWriter create_scratchspace_writer()
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@ -123,6 +133,7 @@ private:
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void query_display_information();
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void query_display_edid(Optional<ScanoutID>);
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ResourceID create_2d_resource(Protocol::Rect rect);
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ResourceID create_3d_resource(Protocol::Resource3DSpecification const& resource_3d_specification);
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void delete_resource(ResourceID resource_id);
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void ensure_backing_storage(ResourceID resource_id, Memory::Region const& region, size_t buffer_offset, size_t buffer_length);
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void detach_backing_storage(ResourceID resource_id);
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@ -138,10 +149,15 @@ private:
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VirtIO::Configuration const* m_device_configuration { nullptr };
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ResourceID m_resource_id_counter { 0 };
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ContextID m_context_id_counter { 0 };
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RefPtr<GPU3DDevice> m_3d_device;
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bool m_has_virgl_support { false };
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// Synchronous commands
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WaitQueue m_outstanding_request;
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Spinlock m_operation_lock;
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Mutex m_operation_lock;
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OwnPtr<Memory::Region> m_scratch_space;
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friend class Kernel::Graphics::VirtIOGPU::GPU3DDevice;
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};
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}
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