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Kernel: Add support for multiple VirtIO GPU outputs
This creates /dev/fbX devices for each physical output, owned by the parent VirtIOGPU instance. This allows mapping and setting resolutions independently for each output.
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parent
708f27ca0e
commit
8749235046
8 changed files with 305 additions and 194 deletions
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@ -15,15 +15,40 @@ namespace Kernel::Graphics {
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class VirtIOFrameBufferDevice final : public BlockDevice {
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public:
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VirtIOFrameBufferDevice(RefPtr<VirtIOGPU> virtio_gpu);
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VirtIOFrameBufferDevice(VirtIOGPU& virtio_gpu, VirtIOGPUScanoutID);
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virtual ~VirtIOFrameBufferDevice() override;
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virtual void deactivate_writes();
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virtual void activate_writes();
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bool try_to_set_resolution(size_t width, size_t height);
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void clear_to_black();
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VMObject& vm_object() { return m_framebuffer->vmobject(); }
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Region& region() { return *m_framebuffer; }
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size_t width() const { return display_info().rect.width; }
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size_t height() const { return display_info().rect.height; }
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size_t pitch() const { return display_info().rect.width * 4; }
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size_t size_in_bytes() const;
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static size_t calculate_framebuffer_size(size_t width, size_t height)
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{
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return sizeof(u32) * width * height;
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}
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void flush_dirty_window(VirtIOGPURect const&);
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void transfer_framebuffer_data_to_host(VirtIOGPURect const&);
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void flush_displayed_image(VirtIOGPURect const&);
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void draw_ntsc_test_pattern();
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private:
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virtual const char* class_name() const override { return "VirtIOFrameBuffer"; }
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VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne const& display_info() const;
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VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne& display_info();
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virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
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virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
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virtual bool can_read(const FileDescription&, size_t) const override { return true; }
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@ -35,7 +60,10 @@ private:
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virtual mode_t required_mode() const override { return 0666; }
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virtual String device_name() const override { return String::formatted("fb{}", minor()); }
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RefPtr<VirtIOGPU> m_gpu;
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VirtIOGPU& m_gpu;
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const VirtIOGPUScanoutID m_scanout;
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VirtIOGPUResourceID m_resource_id { 0 };
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OwnPtr<Region> m_framebuffer;
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RefPtr<VMObject> m_framebuffer_sink_vmobject;
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bool m_are_writes_active { true };
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// FIXME: This needs to be cleaned up if the WindowServer exits while we are in a tty
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