f476b49fd8
A VirtIO graphics adapter is really the VirtIO GPU, so the virtualized hardware has no distinction between both components so there's no need to put such distinction in software. We might need to split things in the future, but when we do so, we must take proper care to ensure that the interface between the components is correct and use the usual codebase patterns.
220 lines
10 KiB
C++
220 lines
10 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Graphics/FramebufferDevice.h>
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#include <Kernel/Graphics/GraphicsManagement.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Process.h>
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#include <Kernel/Sections.h>
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#include <LibC/errno_numbers.h>
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#include <LibC/sys/ioctl_numbers.h>
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#define MAX_RESOLUTION_WIDTH 4096
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#define MAX_RESOLUTION_HEIGHT 2160
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namespace Kernel {
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NonnullRefPtr<FramebufferDevice> FramebufferDevice::create(const GraphicsDevice& adapter, size_t output_port_index, PhysicalAddress paddr, size_t width, size_t height, size_t pitch)
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{
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auto framebuffer_device_or_error = DeviceManagement::try_create_device<FramebufferDevice>(adapter, output_port_index, paddr, width, height, pitch);
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// FIXME: Find a way to propagate errors
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VERIFY(!framebuffer_device_or_error.is_error());
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return framebuffer_device_or_error.release_value();
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}
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KResultOr<Memory::Region*> FramebufferDevice::mmap(Process& process, OpenFileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
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{
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SpinlockLocker lock(m_activation_lock);
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REQUIRE_PROMISE(video);
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if (!shared)
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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() != Memory::page_round_up(framebuffer_size_in_bytes()))
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return EOVERFLOW;
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m_userspace_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, Memory::page_round_up(framebuffer_size_in_bytes())));
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m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, Memory::page_round_up(framebuffer_size_in_bytes())));
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m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(Memory::page_round_up(framebuffer_size_in_bytes()), AllocationStrategy::AllocateNow));
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m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, Memory::page_round_up(framebuffer_size_in_bytes()), "Framebuffer", Memory::Region::Access::ReadWrite));
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m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, Memory::page_round_up(framebuffer_size_in_bytes()), "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
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RefPtr<Memory::VMObject> chosen_vmobject;
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if (m_graphical_writes_enabled) {
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chosen_vmobject = m_real_framebuffer_vmobject;
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} else {
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chosen_vmobject = m_swapped_framebuffer_vmobject;
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}
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m_userspace_framebuffer_region = TRY(process.address_space().allocate_region_with_vmobject(
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range,
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chosen_vmobject.release_nonnull(),
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0,
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"Framebuffer",
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prot,
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shared));
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return m_userspace_framebuffer_region;
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}
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void FramebufferDevice::deactivate_writes()
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{
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SpinlockLocker lock(m_activation_lock);
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if (!m_userspace_framebuffer_region)
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return;
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memcpy(m_swapped_framebuffer_region->vaddr().as_ptr(), m_real_framebuffer_region->vaddr().as_ptr(), Memory::page_round_up(framebuffer_size_in_bytes()));
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auto vmobject = m_swapped_framebuffer_vmobject;
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m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
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m_userspace_framebuffer_region->remap();
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m_graphical_writes_enabled = false;
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}
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void FramebufferDevice::activate_writes()
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{
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SpinlockLocker lock(m_activation_lock);
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if (!m_userspace_framebuffer_region || !m_real_framebuffer_vmobject)
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return;
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// restore the image we had in the void area
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// FIXME: if we happen to have multiple Framebuffers that are writing to that location
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// we will experience glitches...
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memcpy(m_real_framebuffer_region->vaddr().as_ptr(), m_swapped_framebuffer_region->vaddr().as_ptr(), Memory::page_round_up(framebuffer_size_in_bytes()));
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auto vmobject = m_userspace_real_framebuffer_vmobject;
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m_userspace_framebuffer_region->set_vmobject(vmobject.release_nonnull());
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m_userspace_framebuffer_region->remap();
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m_graphical_writes_enabled = true;
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}
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UNMAP_AFTER_INIT KResult FramebufferDevice::initialize()
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{
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// FIXME: Would be nice to be able to unify this with mmap above, but this
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// function is UNMAP_AFTER_INIT for the time being.
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m_real_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_for_physical_range(m_framebuffer_address, Memory::page_round_up(framebuffer_size_in_bytes())));
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m_swapped_framebuffer_vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(Memory::page_round_up(framebuffer_size_in_bytes()), AllocationStrategy::AllocateNow));
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m_real_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_real_framebuffer_vmobject, Memory::page_round_up(framebuffer_size_in_bytes()), "Framebuffer", Memory::Region::Access::ReadWrite));
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m_swapped_framebuffer_region = TRY(MM.allocate_kernel_region_with_vmobject(*m_swapped_framebuffer_vmobject, Memory::page_round_up(framebuffer_size_in_bytes()), "Framebuffer Swap (Blank)", Memory::Region::Access::ReadWrite));
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return KSuccess;
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}
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UNMAP_AFTER_INIT FramebufferDevice::FramebufferDevice(const GraphicsDevice& adapter, size_t output_port_index)
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: BlockDevice(29, GraphicsManagement::the().allocate_minor_device_number())
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, m_graphics_adapter(adapter)
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, m_output_port_index(output_port_index)
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{
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}
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UNMAP_AFTER_INIT FramebufferDevice::FramebufferDevice(const GraphicsDevice& adapter, size_t output_port_index, PhysicalAddress addr, size_t width, size_t height, size_t pitch)
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: BlockDevice(29, GraphicsManagement::the().allocate_minor_device_number())
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, m_graphics_adapter(adapter)
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, m_framebuffer_address(addr)
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, m_framebuffer_pitch(pitch)
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, m_framebuffer_width(width)
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, m_framebuffer_height(height)
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, m_output_port_index(output_port_index)
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{
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VERIFY(!m_framebuffer_address.is_null());
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VERIFY(m_framebuffer_pitch);
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VERIFY(m_framebuffer_width);
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VERIFY(m_framebuffer_height);
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dbgln("Framebuffer {}: address={}, pitch={}, width={}, height={}", minor(), addr, pitch, width, height);
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}
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size_t FramebufferDevice::framebuffer_size_in_bytes() const
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{
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if (m_graphics_adapter->double_framebuffering_capable())
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return m_framebuffer_pitch * m_framebuffer_height * 2;
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return m_framebuffer_pitch * m_framebuffer_height;
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}
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KResult FramebufferDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> 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 user_size = static_ptr_cast<size_t*>(arg);
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size_t value = framebuffer_size_in_bytes();
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return copy_to_user(user_size, &value);
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}
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case FB_IOCTL_GET_BUFFER: {
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auto user_index = static_ptr_cast<int*>(arg);
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int value = m_y_offset == 0 ? 0 : 1;
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TRY(copy_to_user(user_index, &value));
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if (!m_graphics_adapter->double_framebuffering_capable())
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return ENOTIMPL;
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return KSuccess;
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}
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case FB_IOCTL_SET_BUFFER: {
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auto buffer = static_cast<int>(arg.ptr());
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if (buffer != 0 && buffer != 1)
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return EINVAL;
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if (!m_graphics_adapter->double_framebuffering_capable())
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return ENOTIMPL;
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m_graphics_adapter->set_y_offset(m_output_port_index, buffer == 0 ? 0 : m_framebuffer_height);
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return KSuccess;
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}
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case FB_IOCTL_GET_RESOLUTION: {
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auto user_resolution = static_ptr_cast<FBResolution*>(arg);
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FBResolution resolution {};
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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return copy_to_user(user_resolution, &resolution);
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}
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case FB_IOCTL_SET_RESOLUTION: {
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auto user_resolution = static_ptr_cast<FBResolution*>(arg);
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FBResolution resolution;
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TRY(copy_from_user(&resolution, user_resolution));
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if (resolution.width > MAX_RESOLUTION_WIDTH || resolution.height > MAX_RESOLUTION_HEIGHT)
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return EINVAL;
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if (!m_graphics_adapter->modesetting_capable()) {
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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TRY(copy_to_user(user_resolution, &resolution));
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return ENOTIMPL;
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}
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if (!m_graphics_adapter->try_to_set_resolution(m_output_port_index, resolution.width, resolution.height)) {
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m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
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dbgln_if(FRAMEBUFFER_DEVICE_DEBUG, "Reverting resolution: [{}x{}]", m_framebuffer_width, m_framebuffer_height);
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// Note: We try to revert everything back, and if it doesn't work, just assert.
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if (!m_graphics_adapter->try_to_set_resolution(m_output_port_index, m_framebuffer_width, m_framebuffer_height)) {
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VERIFY_NOT_REACHED();
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}
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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TRY(copy_to_user(user_resolution, &resolution));
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return EINVAL;
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}
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m_framebuffer_width = resolution.width;
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m_framebuffer_height = resolution.height;
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m_framebuffer_pitch = m_framebuffer_width * sizeof(u32);
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dbgln_if(FRAMEBUFFER_DEVICE_DEBUG, "New resolution: [{}x{}]", m_framebuffer_width, m_framebuffer_height);
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resolution.pitch = m_framebuffer_pitch;
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resolution.width = m_framebuffer_width;
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resolution.height = m_framebuffer_height;
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return copy_to_user(user_resolution, &resolution);
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}
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case FB_IOCTL_GET_BUFFER_OFFSET: {
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auto user_buffer_offset = static_ptr_cast<FBBufferOffset*>(arg);
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FBBufferOffset buffer_offset;
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TRY(copy_from_user(&buffer_offset, user_buffer_offset));
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if (buffer_offset.buffer_index != 0 && buffer_offset.buffer_index != 1)
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return EINVAL;
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buffer_offset.offset = (size_t)buffer_offset.buffer_index * m_framebuffer_pitch * m_framebuffer_height;
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return copy_to_user(user_buffer_offset, &buffer_offset);
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}
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case FB_IOCTL_FLUSH_BUFFERS:
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return ENOTSUP;
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default:
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return EINVAL;
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};
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}
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}
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