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Kernel/Graphics: Introduce a new mechanism to initialize a PCI device

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Instead of using a clunky switch-case paradigm, we now have all drivers
being declaring two methods for their adapter class - create and probe.
These methods are linked in each PCIGraphicsDriverInitializer structure,
in a new s_initializers static list of them.
Then, when we probe for a PCI device, we use each probe method and if
there's a match, then the corresponding create method is called.

As a result of this change, it's much more easy to add more drivers and
the initialization code is more readable.
This commit is contained in:
Liav A 2022-12-17 21:15:31 +02:00 • committed by Andrew Kaster
parent 7625f7db73
commit 72b144e9e9
12 changed files with 85 additions and 71 deletions
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16
Kernel/Graphics/VirtIOGPU/GraphicsAdapter.cpp
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@ -22,19 +22,23 @@ namespace Kernel {
#define DEVICE_EVENTS_CLEAR 0x4
#define DEVICE_NUM_SCANOUTS 0x8
NonnullLockRefPtr<VirtIOGraphicsAdapter> VirtIOGraphicsAdapter::initialize(PCI::DeviceIdentifier const& device_identifier)
ErrorOr<bool> VirtIOGraphicsAdapter::probe(PCI::DeviceIdentifier const& device_identifier)
{
return device_identifier.hardware_id().vendor_id == PCI::VendorID::VirtIO;
}
ErrorOr<NonnullLockRefPtr<GenericGraphicsAdapter>> VirtIOGraphicsAdapter::create(PCI::DeviceIdentifier const& device_identifier)
{
VERIFY(device_identifier.hardware_id().vendor_id == PCI::VendorID::VirtIO);
// Setup memory transfer region
auto scratch_space_region = MUST(MM.allocate_contiguous_kernel_region(
auto scratch_space_region = TRY(MM.allocate_contiguous_kernel_region(
32 * PAGE_SIZE,
"VirtGPU Scratch Space"sv,
Memory::Region::Access::ReadWrite));
auto active_context_ids = MUST(Bitmap::create(VREND_MAX_CTX, false));
auto adapter = adopt_lock_ref(*new (nothrow) VirtIOGraphicsAdapter(device_identifier, move(active_context_ids), move(scratch_space_region)));
auto active_context_ids = TRY(Bitmap::create(VREND_MAX_CTX, false));
auto adapter = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) VirtIOGraphicsAdapter(device_identifier, move(active_context_ids), move(scratch_space_region))));
adapter->initialize();
MUST(adapter->initialize_adapter());
TRY(adapter->initialize_adapter());
return adapter;
}