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https://github.com/RGBCube/serenity
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1f9d3a3523
There are now 2 separate classes for almost the same object type: - EnumerableDeviceIdentifier, which is used in the enumeration code for all PCI host controller classes. This is allowed to be moved and copied, as it doesn't support ref-counting. - DeviceIdentifier, which inherits from EnumerableDeviceIdentifier. This class uses ref-counting, and is not allowed to be copied. It has a spinlock member in its structure to allow safely executing complicated IO sequences on a PCI device and its space configuration. There's a static method that allows a quick conversion from EnumerableDeviceIdentifier to DeviceIdentifier while creating a NonnullRefPtr out of it. The reason for doing this is for the sake of integrity and reliablity of the system in 2 places: - Ensure that "complicated" tasks that rely on manipulating PCI device registers are done in a safe manner. For example, determining a PCI BAR space size requires multiple read and writes to the same register, and if another CPU tries to do something else with our selected register, then the result will be a catastrophe. - Allow the PCI API to have a united form around a shared object which actually holds much more data than the PCI::Address structure. This is fundamental if we want to do certain types of optimizations, and be able to support more features of the PCI bus in the foreseeable future. This patch already has several implications: - All PCI::Device(s) hold a reference to a DeviceIdentifier structure being given originally from the PCI::Access singleton. This means that all instances of DeviceIdentifier structures are located in one place, and all references are pointing to that location. This ensures that locking the operation spinlock will take effect in all the appropriate places. - We no longer support adding PCI host controllers and then immediately allow for enumerating it with a lambda function. It was found that this method is extremely broken and too much complicated to work reliably with the new paradigm being introduced in this patch. This means that for Volume Management Devices (Intel VMD devices), we simply first enumerate the PCI bus for such devices in the storage code, and if we find a device, we attach it in the PCI::Access method which will scan for devices behind that bridge and will add new DeviceIdentifier(s) objects to its internal Vector. Afterwards, we just continue as usual with scanning for actual storage controllers, so we will find a corresponding NVMe controllers if there were any behind that VMD bridge.
85 lines
4 KiB
C++
85 lines
4 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/Atomic.h>
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#include <AK/Checked.h>
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#include <AK/Try.h>
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#if ARCH(X86_64)
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# include <Kernel/Arch/x86_64/Hypervisor/BochsDisplayConnector.h>
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#endif
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/IDs.h>
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#include <Kernel/Graphics/Bochs/Definitions.h>
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#include <Kernel/Graphics/Bochs/GraphicsAdapter.h>
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#include <Kernel/Graphics/Bochs/QEMUDisplayConnector.h>
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#include <Kernel/Graphics/Console/ContiguousFramebufferConsole.h>
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#include <Kernel/Graphics/GraphicsManagement.h>
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#include <Kernel/Memory/TypedMapping.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT ErrorOr<bool> BochsGraphicsAdapter::probe(PCI::DeviceIdentifier const& pci_device_identifier)
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{
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PCI::HardwareID id = pci_device_identifier.hardware_id();
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if (id.vendor_id == PCI::VendorID::QEMUOld && id.device_id == 0x1111)
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return true;
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if (id.vendor_id == PCI::VendorID::VirtualBox && id.device_id == 0xbeef)
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return true;
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return false;
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}
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UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<GenericGraphicsAdapter>> BochsGraphicsAdapter::create(PCI::DeviceIdentifier const& pci_device_identifier)
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{
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auto adapter = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) BochsGraphicsAdapter(pci_device_identifier)));
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MUST(adapter->initialize_adapter(pci_device_identifier));
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return adapter;
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}
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UNMAP_AFTER_INIT BochsGraphicsAdapter::BochsGraphicsAdapter(PCI::DeviceIdentifier const& device_identifier)
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: PCI::Device(const_cast<PCI::DeviceIdentifier&>(device_identifier))
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{
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}
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UNMAP_AFTER_INIT ErrorOr<void> BochsGraphicsAdapter::initialize_adapter(PCI::DeviceIdentifier const& pci_device_identifier)
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{
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// Note: If we use VirtualBox graphics adapter (which is based on Bochs one), we need to use IO ports
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// Note: Bochs (the real bochs graphics adapter in the Bochs emulator) uses revision ID of 0x0
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// and doesn't support memory-mapped IO registers.
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// Note: In non x86-builds, we should never encounter VirtualBox hardware nor Pure Bochs VBE graphics,
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// so just assume we can use the QEMU BochsVBE-compatible graphics adapter only.
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auto bar0_space_size = PCI::get_BAR_space_size(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR0);
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#if ARCH(X86_64)
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bool virtual_box_hardware = (pci_device_identifier.hardware_id().vendor_id == 0x80ee && pci_device_identifier.hardware_id().device_id == 0xbeef);
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if (pci_device_identifier.revision_id().value() == 0x0 || virtual_box_hardware) {
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m_display_connector = BochsDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR0(pci_device_identifier) & 0xfffffff0), bar0_space_size, virtual_box_hardware);
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} else {
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auto registers_mapping = TRY(Memory::map_typed_writable<BochsDisplayMMIORegisters volatile>(PhysicalAddress(PCI::get_BAR2(pci_device_identifier) & 0xfffffff0)));
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VERIFY(registers_mapping.region);
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m_display_connector = QEMUDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR0(pci_device_identifier) & 0xfffffff0), bar0_space_size, move(registers_mapping));
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}
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#else
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auto registers_mapping = TRY(Memory::map_typed_writable<BochsDisplayMMIORegisters volatile>(PhysicalAddress(PCI::get_BAR2(pci_device_identifier.address()) & 0xfffffff0)));
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VERIFY(registers_mapping.region);
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m_display_connector = QEMUDisplayConnector::must_create(PhysicalAddress(PCI::get_BAR0(pci_device_identifier) & 0xfffffff0), bar0_space_size, move(registers_mapping));
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#endif
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// Note: According to Gerd Hoffmann - "The linux driver simply does
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// the unblank unconditionally. With bochs-display this is not needed but
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// it also has no bad side effect".
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// FIXME: If the error is ENOTIMPL, ignore it for now until we implement
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// unblank support for VBoxDisplayConnector class too.
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auto result = m_display_connector->unblank();
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if (result.is_error() && result.error().code() != ENOTIMPL)
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return result;
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TRY(m_display_connector->set_safe_mode_setting());
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return {};
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}
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}
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