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Kernel: Implement basic VirGL device

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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.
This commit is contained in:
Sahan Fernando 2022-02-13 16:45:30 +11:00 • committed by Ali Mohammad Pur
parent 966989afe8
commit fd6a536c60
7 changed files with 503 additions and 8 deletions
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18
Kernel/Graphics/VirtIOGPU/GraphicsAdapter.h
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@ -19,6 +19,8 @@
namespace Kernel::Graphics::VirtIOGPU {
class GPU3DDevice;
#define VIRTIO_GPU_F_VIRGL (1 << 0)
#define VIRTIO_GPU_F_EDID (1 << 1)
@ -47,6 +49,7 @@ public:
virtual bool vga_compatible() const override { return false; }
virtual void initialize() override;
void initialize_3d_device();
ErrorOr<ByteBuffer> get_edid(size_t output_port_index) const override;
@ -109,8 +112,15 @@ private:
u32 get_pending_events();
void clear_pending_events(u32 event_bitmask);
// 3D Command stuff
ContextID create_context();
void attach_resource_to_context(ResourceID resource_id, ContextID context_id);
void submit_command_buffer(ContextID, Function<size_t(Bytes)> buffer_writer);
Protocol::TextureFormat get_framebuffer_format() const { return Protocol::TextureFormat::VIRTIO_GPU_FORMAT_B8G8R8X8_UNORM; }
auto& operation_lock() { return m_operation_lock; }
ResourceID allocate_resource_id();
ContextID allocate_context_id();
PhysicalAddress start_of_scratch_space() const { return m_scratch_space->physical_page(0)->paddr(); }
AK::BinaryBufferWriter create_scratchspace_writer()
@ -123,6 +133,7 @@ private:
void query_display_information();
void query_display_edid(Optional<ScanoutID>);
ResourceID create_2d_resource(Protocol::Rect rect);
ResourceID create_3d_resource(Protocol::Resource3DSpecification const& resource_3d_specification);
void delete_resource(ResourceID resource_id);
void ensure_backing_storage(ResourceID resource_id, Memory::Region const& region, size_t buffer_offset, size_t buffer_length);
void detach_backing_storage(ResourceID resource_id);
@ -138,10 +149,15 @@ private:
VirtIO::Configuration const* m_device_configuration { nullptr };
ResourceID m_resource_id_counter { 0 };
ContextID m_context_id_counter { 0 };
RefPtr<GPU3DDevice> m_3d_device;
bool m_has_virgl_support { false };
// Synchronous commands
WaitQueue m_outstanding_request;
Spinlock m_operation_lock;
Mutex m_operation_lock;
OwnPtr<Memory::Region> m_scratch_space;
friend class Kernel::Graphics::VirtIOGPU::GPU3DDevice;
};
}