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https://github.com/RGBCube/serenity
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Kernel: Implement buffer flipping for VirtIOGPU framebuffers
This solves tearing issues and improves performance when updating the VirtIOGPU framebuffers.
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parent
6e792553f2
commit
7fdf902e4a
7 changed files with 148 additions and 65 deletions
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@ -14,6 +14,13 @@
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namespace Kernel::Graphics {
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class VirtIOFrameBufferDevice final : public BlockDevice {
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friend class VirtIOGPUConsole;
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struct Buffer {
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size_t framebuffer_offset { 0 };
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u8* framebuffer_data { nullptr };
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VirtIOGPUResourceID resource_id { 0 };
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};
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public:
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VirtIOFrameBufferDevice(VirtIOGPU& virtio_gpu, VirtIOGPUScanoutID);
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virtual ~VirtIOFrameBufferDevice() override;
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@ -22,23 +29,23 @@ public:
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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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void clear_to_black(Buffer&);
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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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// VirtIO resources can only map on page boundaries!
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return page_round_up(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 flush_dirty_window(VirtIOGPURect const&, Buffer&);
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void transfer_framebuffer_data_to_host(VirtIOGPURect const&, Buffer&);
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void flush_displayed_image(VirtIOGPURect const&, Buffer&);
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void draw_ntsc_test_pattern();
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void draw_ntsc_test_pattern(Buffer&);
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u8* framebuffer_data();
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@ -49,6 +56,8 @@ private:
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VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne& display_info();
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void create_framebuffer();
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void create_buffer(Buffer&, size_t, size_t);
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void set_buffer(int);
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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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@ -61,11 +70,26 @@ 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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static bool is_valid_buffer_index(int buffer_index)
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{
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return buffer_index == 0 || buffer_index == 1;
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}
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Buffer& buffer_from_index(int buffer_index)
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{
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return buffer_index == 0 ? m_main_buffer : m_back_buffer;
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}
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Buffer& current_buffer() const { return *m_current_buffer; }
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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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Buffer* m_current_buffer { nullptr };
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Atomic<int, AK::memory_order_relaxed> m_last_set_buffer_index { 0 };
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Buffer m_main_buffer;
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Buffer m_back_buffer;
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OwnPtr<Region> m_framebuffer;
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RefPtr<VMObject> m_framebuffer_sink_vmobject;
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size_t m_buffer_size { 0 };
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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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WeakPtr<Region> m_userspace_mmap_region;
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