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Kernel/Graphics: Simplify the feature level of the Graphics subsystem

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Instead of letting the user to determine whether framebuffer devices
will be created (which is useless because they are gone by now), let's
simplify the flow by allowing the user to choose between full, limited
or disabled functionality. The determination happens only once, so, if
the user decided to disable graphics support, the initialize method
exits immediately. If limited functionality is chosen, then a generic
DisplayConnector is initialized with the preset framebuffer resolution,
if present, and then the initialize method exits. As a default, the code
proceeds to initialize all drivers as usual.
This commit is contained in:
Liav A 2022-04-30 15:53:02 +03:00 • committed by Andreas Kling
parent e301af8352
commit d49a35df31
5 changed files with 35 additions and 50 deletions
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51
Kernel/Graphics/GraphicsManagement.cpp
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@ -41,16 +41,6 @@ UNMAP_AFTER_INIT GraphicsManagement::GraphicsManagement()
{
}
bool GraphicsManagement::framebuffer_devices_use_bootloader_framebuffer() const
{
return kernel_command_line().are_framebuffer_devices_enabled() == CommandLine::FrameBufferDevices::BootloaderOnly;
}
bool GraphicsManagement::framebuffer_devices_console_only() const
{
return kernel_command_line().are_framebuffer_devices_enabled() == CommandLine::FrameBufferDevices::ConsoleOnly;
}
void GraphicsManagement::disable_vga_emulation_access_permanently()
{
SpinlockLocker locker(m_main_vga_lock);
@ -154,22 +144,18 @@ UNMAP_AFTER_INIT bool GraphicsManagement::determine_and_initialize_graphics_devi
VERIFY(is_vga_compatible_pci_device(device_identifier) || is_display_controller_pci_device(device_identifier));
auto add_and_configure_adapter = [&](GenericGraphicsAdapter& graphics_device) {
m_graphics_devices.append(graphics_device);
if (framebuffer_devices_console_only()) {
graphics_device.enable_consoles();
return;
}
graphics_device.enable_consoles();
graphics_device.initialize_framebuffer_devices();
};
RefPtr<GenericGraphicsAdapter> adapter;
auto create_bootloader_framebuffer_device = [&]() {
if (multiboot_framebuffer_addr.is_null()) {
// Prekernel sets the framebuffer address to 0 if MULTIBOOT_INFO_FRAMEBUFFER_INFO
// is not present, as there is likely never a valid framebuffer at this physical address.
dmesgln("Graphics: Bootloader did not set up a framebuffer, ignoring fbdev argument");
dmesgln("Graphics: Bootloader did not set up a framebuffer");
} else if (multiboot_framebuffer_type != MULTIBOOT_FRAMEBUFFER_TYPE_RGB) {
dmesgln("Graphics: The framebuffer set up by the bootloader is not RGB, ignoring fbdev argument");
dmesgln("Graphics: The framebuffer set up by the bootloader is not RGB");
} else {
dmesgln("Graphics: Using a preset resolution from the bootloader");
adapter = PCIVGACompatibleAdapter::initialize_with_preset_resolution(device_identifier,
@ -180,9 +166,6 @@ UNMAP_AFTER_INIT bool GraphicsManagement::determine_and_initialize_graphics_devi
}
};
if (framebuffer_devices_use_bootloader_framebuffer())
create_bootloader_framebuffer_device();
if (!adapter) {
switch (device_identifier.hardware_id().vendor_id) {
case PCI::VendorID::QEMUOld:
@ -282,16 +265,25 @@ UNMAP_AFTER_INIT bool GraphicsManagement::initialize()
* be created, so SystemServer will not try to initialize WindowServer.
*/
auto graphics_subsystem_mode = kernel_command_line().graphics_subsystem_mode();
if (graphics_subsystem_mode == CommandLine::GraphicsSubsystemMode::Disabled)
return true;
if (graphics_subsystem_mode == CommandLine::GraphicsSubsystemMode::Limited && !multiboot_framebuffer_addr.is_null() && multiboot_framebuffer_type != MULTIBOOT_FRAMEBUFFER_TYPE_RGB) {
dmesgln("Graphics: Using a preset resolution from the bootloader, without knowing the PCI device");
m_preset_resolution_generic_display_connector = GenericDisplayConnector::must_create_with_preset_resolution(
multiboot_framebuffer_addr,
multiboot_framebuffer_width,
multiboot_framebuffer_height,
multiboot_framebuffer_pitch);
return true;
}
if (PCI::Access::is_disabled()) {
determine_and_initialize_isa_graphics_device();
return true;
}
if (framebuffer_devices_console_only())
dbgln("Forcing non-initialization of framebuffer devices (console only)");
else if (framebuffer_devices_use_bootloader_framebuffer())
dbgln("Forcing use of framebuffer set up by the bootloader");
MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
// Note: Each graphics controller will try to set its native screen resolution
// upon creation. Later on, if we don't want to have framebuffer devices, a
@ -317,15 +309,6 @@ UNMAP_AFTER_INIT bool GraphicsManagement::initialize()
return true;
}
bool GraphicsManagement::framebuffer_devices_exist() const
{
for (auto& graphics_device : m_graphics_devices) {
if (graphics_device.framebuffer_devices_initialized())
return true;
}
return false;
}
void GraphicsManagement::set_console(Graphics::Console& console)
{
m_console = console;