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Kernel: Dynamically allocate PCI devices

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There was no need to prealloce almost a 5 MiB buffer for PCI all
possible pci devies :D
This commit is contained in:
Bananymous
2026-05-03 01:57:14 +03:00
parent f4e2e62d04
commit f293377e31
2 changed files with 85 additions and 84 deletions
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43
kernel/include/kernel/PCI.h
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@@ -66,11 +66,13 @@ namespace Kernel::PCI
};
public:
Device() = default;
Device(uint8_t bus, uint8_t dev, uint8_t func)
: m_bus(bus)
, m_dev(dev)
, m_func(func)
{ }
void set_location(uint8_t bus, uint8_t dev, uint8_t func);
void initialize(paddr_t pcie_paddr);
bool is_valid() const { return m_is_valid; }
uint32_t read_dword(uint8_t) const;
uint16_t read_word(uint8_t) const;
@@ -124,10 +126,9 @@ namespace Kernel::PCI
BAN::ErrorOr<uint8_t> find_intx_interrupt();
private:
bool m_is_valid { false };
uint8_t m_bus { 0 };
uint8_t m_dev { 0 };
uint8_t m_func { 0 };
const uint8_t m_bus { 0 };
const uint8_t m_dev { 0 };
const uint8_t m_func { 0 };
vaddr_t m_mmio_config { 0 };
@@ -161,11 +162,8 @@ namespace Kernel::PCI
template<typename F>
void for_each_device(F callback)
{
for (auto& bus : m_buses)
for (auto& dev : bus)
for (auto& func : dev)
if (func.is_valid())
callback(func);
for (auto& dev : m_devices)
callback(dev);
};
uint32_t read_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset);
@@ -179,19 +177,22 @@ namespace Kernel::PCI
BAN::Optional<uint8_t> reserve_msi();
private:
PCIManager() : m_bus_pcie_paddr(0) {}
void check_function(uint8_t bus, uint8_t dev, uint8_t func);
void check_device(uint8_t bus, uint8_t dev);
void check_bus(uint8_t bus);
void check_all_buses();
struct PCIeInfo
{
paddr_t bus_paddr[256];
};
PCIManager() = default;
void check_function(const PCIeInfo&, uint8_t bus, uint8_t dev, uint8_t func);
void check_device(const PCIeInfo&, uint8_t bus, uint8_t dev);
void check_bus(const PCIeInfo&, uint8_t bus);
void check_all_buses(const PCIeInfo&);
void initialize_impl();
private:
static constexpr uint8_t m_msi_count = IRQ_MSI_END - IRQ_MSI_BASE;
using PCIBus = BAN::Array<BAN::Array<Device, 8>, 32>;
BAN::Array<PCIBus, 256> m_buses;
BAN::Array<paddr_t, 256> m_bus_pcie_paddr;
bool m_is_pcie { false };
BAN::Vector<Device> m_devices;
SpinLock m_reserved_msi_lock;
BAN::Array<uint8_t, m_msi_count / 8> m_reserved_msi_bitmap;