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https://github.com/RGBCube/serenity
synced 2025-07-26 17:27:34 +00:00
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.
This commit is contained in:
Tom
Andreas Kling
parent
708f27ca0e
commit
8749235046
8 changed files with 305 additions and 194 deletions
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@ -10,12 +10,34 @@
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namespace Kernel::Graphics {
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VirtIOFrameBufferDevice::VirtIOFrameBufferDevice(RefPtr<VirtIOGPU> virtio_gpu)
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VirtIOFrameBufferDevice::VirtIOFrameBufferDevice(VirtIOGPU& virtio_gpu, VirtIOGPUScanoutID scanout)
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: BlockDevice(29, GraphicsManagement::the().allocate_minor_device_number())
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, m_gpu(virtio_gpu)
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, m_scanout(scanout)
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{
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auto& info = display_info();
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Locker locker(m_gpu.operation_lock());
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// 1. Allocate frame buffer
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// FIXME: We really should be trying to allocate a small amount of pages initially, with ensure_backing_storage increasing the backing memory of the region as needed
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size_t buffer_length = calculate_framebuffer_size(MAX_VIRTIOGPU_RESOLUTION_WIDTH, MAX_VIRTIOGPU_RESOLUTION_HEIGHT);
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m_framebuffer = MM.allocate_kernel_region(page_round_up(buffer_length), String::formatted("VirtGPU FrameBuffer #{}", scanout.value()), Region::Access::Read | Region::Access::Write, AllocationStrategy::AllocateNow);
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// 2. Create BUFFER using VIRTIO_GPU_CMD_RESOURCE_CREATE_2D
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m_resource_id = m_gpu.create_2d_resource(info.rect);
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// 3. Attach backing storage using VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING
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m_gpu.ensure_backing_storage(*m_framebuffer, buffer_length, m_resource_id);
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// 4. Use VIRTIO_GPU_CMD_SET_SCANOUT to link the framebuffer to a display scanout.
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m_gpu.set_scanout_resource(m_scanout.value(), m_resource_id, info.rect);
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// 5. Render our test pattern
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draw_ntsc_test_pattern();
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// 6. Use VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D to update the host resource from guest memory.
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transfer_framebuffer_data_to_host(info.rect);
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// 7. Use VIRTIO_GPU_CMD_RESOURCE_FLUSH to flush the updated resource to the display.
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flush_displayed_image(info.rect);
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auto write_sink_page = MM.allocate_user_physical_page(MemoryManager::ShouldZeroFill::No).release_nonnull();
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auto num_needed_pages = m_gpu->framebuffer_vm_object().page_count();
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auto num_needed_pages = m_framebuffer->vmobject().page_count();
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NonnullRefPtrVector<PhysicalPage> pages;
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for (auto i = 0u; i < num_needed_pages; ++i) {
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pages.append(write_sink_page);
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@ -27,13 +49,66 @@ VirtIOFrameBufferDevice::~VirtIOFrameBufferDevice()
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{
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}
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VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne const& VirtIOFrameBufferDevice::display_info() const
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{
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return m_gpu.display_info(m_scanout);
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}
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VirtIOGPURespDisplayInfo::VirtIOGPUDisplayOne& VirtIOFrameBufferDevice::display_info()
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{
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return m_gpu.display_info(m_scanout);
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}
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size_t VirtIOFrameBufferDevice::size_in_bytes() const
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{
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auto& info = display_info();
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return info.rect.width * info.rect.height * sizeof(u32);
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}
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void VirtIOFrameBufferDevice::flush_dirty_window(VirtIOGPURect const& dirty_rect)
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{
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m_gpu.flush_dirty_window(m_scanout, dirty_rect, m_resource_id);
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}
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void VirtIOFrameBufferDevice::transfer_framebuffer_data_to_host(VirtIOGPURect const& rect)
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{
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m_gpu.transfer_framebuffer_data_to_host(m_scanout, rect, m_resource_id);
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}
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void VirtIOFrameBufferDevice::flush_displayed_image(VirtIOGPURect const& dirty_rect)
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{
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m_gpu.flush_displayed_image(dirty_rect, m_resource_id);
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}
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bool VirtIOFrameBufferDevice::try_to_set_resolution(size_t width, size_t height)
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{
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if (width > MAX_VIRTIOGPU_RESOLUTION_WIDTH || height > MAX_VIRTIOGPU_RESOLUTION_HEIGHT)
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return false;
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Locker locker(m_gpu.operation_lock());
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VirtIOGPURect rect = {
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.x = 0,
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.y = 0,
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.width = (u32)width,
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.height = (u32)height,
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};
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auto old_resource_id = m_resource_id;
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auto new_resource_id = m_gpu.create_2d_resource(rect);
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m_gpu.ensure_backing_storage(*m_framebuffer, calculate_framebuffer_size(width, height), new_resource_id);
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m_gpu.set_scanout_resource(m_scanout.value(), new_resource_id, rect);
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m_gpu.detach_backing_storage(old_resource_id);
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m_gpu.delete_resource(old_resource_id);
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m_resource_id = new_resource_id;
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display_info().rect = rect;
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return true;
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}
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int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr arg)
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{
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REQUIRE_PROMISE(video);
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switch (request) {
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case FB_IOCTL_GET_SIZE_IN_BYTES: {
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auto* out = (size_t*)arg;
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size_t value = m_gpu->framebuffer_size_in_bytes();
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size_t value = size_in_bytes();
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if (!copy_to_user(out, &value))
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return -EFAULT;
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return 0;
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@ -43,9 +118,9 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
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FBResolution resolution;
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if (!copy_from_user(&resolution, user_resolution))
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return -EFAULT;
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if (!m_gpu->try_to_set_resolution(resolution.width, resolution.height))
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if (!try_to_set_resolution(resolution.width, resolution.height))
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return -EINVAL;
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resolution.pitch = m_gpu->framebuffer_pitch();
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resolution.pitch = pitch();
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if (!copy_to_user(user_resolution, &resolution))
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return -EFAULT;
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return 0;
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@ -53,9 +128,9 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
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case FB_IOCTL_GET_RESOLUTION: {
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auto* user_resolution = (FBResolution*)arg;
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FBResolution resolution;
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resolution.pitch = m_gpu->framebuffer_pitch();
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resolution.width = m_gpu->framebuffer_width();
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resolution.height = m_gpu->framebuffer_height();
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resolution.pitch = pitch();
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resolution.width = width();
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resolution.height = height();
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if (!copy_to_user(user_resolution, &resolution))
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return -EFAULT;
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return 0;
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@ -71,7 +146,7 @@ int VirtIOFrameBufferDevice::ioctl(FileDescription&, unsigned request, FlatPtr a
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.height = user_dirty_rect.height
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};
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if (m_are_writes_active)
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m_gpu->flush_dirty_window(dirty_rect);
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flush_dirty_window(dirty_rect);
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return 0;
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}
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default:
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@ -86,14 +161,14 @@ KResultOr<Region*> VirtIOFrameBufferDevice::mmap(Process& process, FileDescripti
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return ENODEV;
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if (offset != 0)
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return ENXIO;
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if (range.size() != page_round_up(m_gpu->framebuffer_size_in_bytes()))
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if (range.size() != page_round_up(size_in_bytes()))
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return EOVERFLOW;
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// We only allow one process to map the region
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if (m_userspace_mmap_region)
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return ENOMEM;
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auto vmobject = m_are_writes_active ? m_gpu->framebuffer_vm_object().clone() : m_framebuffer_sink_vmobject;
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auto vmobject = m_are_writes_active ? m_framebuffer->vmobject().clone() : m_framebuffer_sink_vmobject;
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if (vmobject.is_null())
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return ENOMEM;
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@ -127,9 +202,80 @@ void VirtIOFrameBufferDevice::activate_writes()
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m_are_writes_active = true;
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if (m_userspace_mmap_region) {
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auto* region = m_userspace_mmap_region.unsafe_ptr();
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region->set_vmobject(m_gpu->framebuffer_vm_object());
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region->set_vmobject(m_framebuffer->vmobject());
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region->remap();
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}
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}
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void VirtIOFrameBufferDevice::clear_to_black()
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{
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auto& info = display_info();
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size_t width = info.rect.width;
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size_t height = info.rect.height;
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u8* data = m_framebuffer->vaddr().as_ptr();
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for (size_t i = 0; i < width * height; ++i) {
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data[4 * i + 0] = 0x00;
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data[4 * i + 1] = 0x00;
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data[4 * i + 2] = 0x00;
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data[4 * i + 3] = 0xff;
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}
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}
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void VirtIOFrameBufferDevice::draw_ntsc_test_pattern()
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{
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static constexpr u8 colors[12][4] = {
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{ 0xff, 0xff, 0xff, 0xff }, // White
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{ 0x00, 0xff, 0xff, 0xff }, // Primary + Composite colors
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{ 0xff, 0xff, 0x00, 0xff },
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{ 0x00, 0xff, 0x00, 0xff },
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{ 0xff, 0x00, 0xff, 0xff },
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{ 0x00, 0x00, 0xff, 0xff },
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{ 0xff, 0x00, 0x00, 0xff },
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{ 0xba, 0x01, 0x5f, 0xff }, // Dark blue
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{ 0x8d, 0x3d, 0x00, 0xff }, // Purple
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{ 0x22, 0x22, 0x22, 0xff }, // Shades of gray
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{ 0x10, 0x10, 0x10, 0xff },
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{ 0x00, 0x00, 0x00, 0xff },
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};
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auto& info = display_info();
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size_t width = info.rect.width;
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size_t height = info.rect.height;
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u8* data = m_framebuffer->vaddr().as_ptr();
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// Draw NTSC test card
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for (size_t y = 0; y < height; ++y) {
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for (size_t x = 0; x < width; ++x) {
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size_t color = 0;
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if (3 * y < 2 * height) {
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// Top 2/3 of image is 7 vertical stripes of color spectrum
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color = (7 * x) / width;
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} else if (4 * y < 3 * height) {
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// 2/3 mark to 3/4 mark is backwards color spectrum alternating with black
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auto segment = (7 * x) / width;
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color = segment % 2 ? 10 : 6 - segment;
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} else {
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if (28 * x < 5 * width) {
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color = 8;
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} else if (28 * x < 10 * width) {
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color = 0;
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} else if (28 * x < 15 * width) {
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color = 7;
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} else if (28 * x < 20 * width) {
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color = 10;
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} else if (7 * x < 6 * width) {
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// Grayscale gradient
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color = 26 - ((21 * x) / width);
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} else {
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// Solid black
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color = 10;
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}
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}
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u8* pixel = &data[4 * (y * width + x)];
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for (int i = 0; i < 4; ++i) {
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pixel[i] = colors[color][i];
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}
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}
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}
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dbgln_if(VIRTIO_DEBUG, "Finish drawing the pattern");
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}
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}
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