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Kernel/VirtIO: Introduce the concept of transport options

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The VirtIO specification defines many types of devices with different
purposes, and it also defines 3 possible transport mediums where devices
could be connected to the host machine.

We only care about the PCIe transport, but this commit puts the actual
foundations for supporting the lean MMIO transport too in the future.

To ensure things are kept abstracted but still functional, the VirtIO
transport code is responsible for what is deemed as related to an actual
transport type - allocation of interrupt handlers and tinkering with low
level transport-related registers, etc.
This commit is contained in:
Liav A 2023-06-10 14:46:47 +03:00 • committed by Andrew Kaster
parent 68c3f9aa5a
commit d61c23569e
24 changed files with 732 additions and 429 deletions
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20
Kernel/Bus/VirtIO/Console.cpp
View file

@ -6,6 +6,7 @@
*/
#include <Kernel/Bus/VirtIO/Console.h>
#include <Kernel/Bus/VirtIO/Transport/PCIe/TransportLink.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Sections.h>
#include <Kernel/Tasks/WorkQueue.h>
@ -14,15 +15,16 @@ namespace Kernel::VirtIO {
unsigned Console::next_device_id = 0;
UNMAP_AFTER_INIT NonnullLockRefPtr<Console> Console::must_create(PCI::DeviceIdentifier const& pci_device_identifier)
UNMAP_AFTER_INIT NonnullLockRefPtr<Console> Console::must_create_for_pci_instance(PCI::DeviceIdentifier const& pci_device_identifier)
{
return adopt_lock_ref_if_nonnull(new Console(pci_device_identifier)).release_nonnull();
auto pci_transport_link = MUST(PCIeTransportLink::create(pci_device_identifier));
return adopt_lock_ref_if_nonnull(new (nothrow) Console(move(pci_transport_link))).release_nonnull();
}
UNMAP_AFTER_INIT ErrorOr<void> Console::initialize_virtio_resources()
{
TRY(Device::initialize_virtio_resources());
auto const* cfg = TRY(get_config(VirtIO::ConfigurationType::Device));
auto const* cfg = TRY(transport_entity().get_config(VirtIO::ConfigurationType::Device));
bool success = negotiate_features([&](u64 supported_features) {
u64 negotiated = 0;
if (is_feature_set(supported_features, VIRTIO_CONSOLE_F_SIZE))
@ -35,13 +37,13 @@ UNMAP_AFTER_INIT ErrorOr<void> Console::initialize_virtio_resources()
return Error::from_errno(EIO);
u32 max_nr_ports = 0;
u16 cols = 0, rows = 0;
read_config_atomic([&]() {
transport_entity().read_config_atomic([&]() {
if (is_feature_accepted(VIRTIO_CONSOLE_F_SIZE)) {
cols = config_read16(*cfg, 0x0);
rows = config_read16(*cfg, 0x2);
cols = transport_entity().config_read16(*cfg, 0x0);
rows = transport_entity().config_read16(*cfg, 0x2);
}
if (is_feature_accepted(VIRTIO_CONSOLE_F_MULTIPORT)) {
max_nr_ports = config_read32(*cfg, 0x4);
max_nr_ports = transport_entity().config_read32(*cfg, 0x4);
m_ports.resize(max_nr_ports);
}
});
@ -62,8 +64,8 @@ UNMAP_AFTER_INIT ErrorOr<void> Console::initialize_virtio_resources()
return {};
}
UNMAP_AFTER_INIT Console::Console(PCI::DeviceIdentifier const& pci_device_identifier)
: VirtIO::Device(pci_device_identifier)
UNMAP_AFTER_INIT Console::Console(NonnullOwnPtr<TransportEntity> transport_entity)
: VirtIO::Device(move(transport_entity))
, m_device_id(next_device_id++)
{
}