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https://github.com/RGBCube/serenity
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3fb289e27d
Instead, hold the lock while we copy the contents to a stack-based Vector then iterate on it without any locking. Because we rely on heap allocations, we need to propagate errors back in case of OOM condition, therefore, both PCI::enumerate API function and PCI::Access::add_host_controller_and_enumerate_attached_devices use now a ErrorOr<void> return value to propagate errors. OOM Error can only occur when enumerating the m_device_identifiers vector under a spinlock and trying to expand the temporary Vector which will be used locklessly to actually iterate over the PCI::DeviceIdentifiers objects.
62 lines
2 KiB
C++
62 lines
2 KiB
C++
/*
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* Copyright (c) 2020, 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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#pragma once
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#include <AK/Bitmap.h>
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#include <AK/Try.h>
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#include <AK/Vector.h>
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#include <Kernel/Bus/PCI/Controller/HostController.h>
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#include <Kernel/Bus/PCI/Definitions.h>
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#include <Kernel/FileSystem/SysFS.h>
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#include <Kernel/Locking/Spinlock.h>
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namespace Kernel::PCI {
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class HostBridge;
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class Access {
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public:
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static bool initialize_for_multiple_pci_domains(PhysicalAddress mcfg_table);
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static bool initialize_for_one_pci_domain();
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ErrorOr<void> fast_enumerate(Function<void(DeviceIdentifier const&)>&) const;
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void rescan_hardware();
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static Access& the();
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static bool is_initialized();
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static bool is_disabled();
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void write8_field(Address address, u32 field, u8 value);
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void write16_field(Address address, u32 field, u16 value);
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void write32_field(Address address, u32 field, u32 value);
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u8 read8_field(Address address, u32 field);
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u16 read16_field(Address address, u32 field);
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u32 read32_field(Address address, u32 field);
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DeviceIdentifier get_device_identifier(Address address) const;
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Spinlock const& scan_lock() const { return m_scan_lock; }
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RecursiveSpinlock const& access_lock() const { return m_access_lock; }
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ErrorOr<void> add_host_controller_and_enumerate_attached_devices(NonnullOwnPtr<HostController>, Function<void(DeviceIdentifier const&)> callback);
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private:
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u8 read8_field(Address address, RegisterOffset field);
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u16 read16_field(Address address, RegisterOffset field);
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void add_host_controller(NonnullOwnPtr<HostController>);
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bool find_and_register_pci_host_bridges_from_acpi_mcfg_table(PhysicalAddress mcfg);
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Access();
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Vector<Capability> get_capabilities(Address);
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Optional<u8> get_capabilities_pointer(Address address);
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mutable RecursiveSpinlock m_access_lock;
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mutable Spinlock m_scan_lock;
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HashMap<u32, NonnullOwnPtr<HostController>> m_host_controllers;
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Vector<DeviceIdentifier> m_device_identifiers;
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};
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}
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