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Kernel: Add support for multiple VirtIO GPU outputs

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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.
This commit is contained in:
Tom 2021-06-25 20:44:48 -06:00 • committed by Andreas Kling
parent 708f27ca0e
commit 8749235046
8 changed files with 305 additions and 194 deletions
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32
Kernel/Graphics/VirtIOGPU/VirtIOFrameBufferDevice.h
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@ -15,15 +15,40 @@ namespace Kernel::Graphics {
class VirtIOFrameBufferDevice final : public BlockDevice {
public:
VirtIOFrameBufferDevice(RefPtr<VirtIOGPU> virtio_gpu);
VirtIOFrameBufferDevice(VirtIOGPU& virtio_gpu, VirtIOGPUScanoutID);
virtual ~VirtIOFrameBufferDevice() override;
virtual void deactivate_writes();
virtual void activate_writes();
bool try_to_set_resolution(size_t width, size_t height);
void clear_to_black();
VMObject& vm_object() { return m_framebuffer->vmobject(); }
Region& region() { return *m_framebuffer; }
size_t width() const { return display_info().rect.width; }
size_t height() const { return display_info().rect.height; }
size_t pitch() const { return display_info().rect.width * 4; }
size_t size_in_bytes() const;
static size_t calculate_framebuffer_size(size_t width, size_t height)
{
return sizeof(u32) * width * height;
}
void flush_dirty_window(VirtIOGPURect const&);
void transfer_framebuffer_data_to_host(VirtIOGPURect const&);
void flush_displayed_image(VirtIOGPURect const&);
void draw_ntsc_test_pattern();
private:
virtual const char* class_name() const override { return "VirtIOFrameBuffer"; }
VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne const& display_info() const;
VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne& display_info();
virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
virtual bool can_read(const FileDescription&, size_t) const override { return true; }
@ -35,7 +60,10 @@ private:
virtual mode_t required_mode() const override { return 0666; }
virtual String device_name() const override { return String::formatted("fb{}", minor()); }
RefPtr<VirtIOGPU> m_gpu;
VirtIOGPU& m_gpu;
const VirtIOGPUScanoutID m_scanout;
VirtIOGPUResourceID m_resource_id { 0 };
OwnPtr<Region> m_framebuffer;
RefPtr<VMObject> m_framebuffer_sink_vmobject;
bool m_are_writes_active { true };
// FIXME: This needs to be cleaned up if the WindowServer exits while we are in a tty