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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.
203 lines
6 KiB
C++
203 lines
6 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 <Kernel/Bus/PCI/API.h>
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#include <Kernel/Bus/PCI/Access.h>
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#include <Kernel/Sections.h>
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namespace Kernel::PCI {
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void write8(Address address, PCI::RegisterOffset field, u8 value) { Access::the().write8_field(address, to_underlying(field), value); }
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void write16(Address address, PCI::RegisterOffset field, u16 value) { Access::the().write16_field(address, to_underlying(field), value); }
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void write32(Address address, PCI::RegisterOffset field, u32 value) { Access::the().write32_field(address, to_underlying(field), value); }
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u8 read8(Address address, PCI::RegisterOffset field) { return Access::the().read8_field(address, to_underlying(field)); }
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u16 read16(Address address, PCI::RegisterOffset field) { return Access::the().read16_field(address, to_underlying(field)); }
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u32 read32(Address address, PCI::RegisterOffset field) { return Access::the().read32_field(address, to_underlying(field)); }
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ErrorOr<void> enumerate(Function<void(DeviceIdentifier const&)> callback)
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{
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return Access::the().fast_enumerate(callback);
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}
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DeviceIdentifier get_device_identifier(Address address)
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{
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return Access::the().get_device_identifier(address);
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}
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HardwareID get_hardware_id(Address address)
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{
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return { read16(address, PCI::RegisterOffset::VENDOR_ID), read16(address, PCI::RegisterOffset::DEVICE_ID) };
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}
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void enable_io_space(Address address)
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{
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write16(address, PCI::RegisterOffset::COMMAND, read16(address, PCI::RegisterOffset::COMMAND) | (1 << 0));
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}
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void disable_io_space(Address address)
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{
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write16(address, PCI::RegisterOffset::COMMAND, read16(address, PCI::RegisterOffset::COMMAND) & ~(1 << 0));
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}
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void enable_memory_space(Address address)
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{
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write16(address, PCI::RegisterOffset::COMMAND, read16(address, PCI::RegisterOffset::COMMAND) | (1 << 1));
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}
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void disable_memory_space(Address address)
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{
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write16(address, PCI::RegisterOffset::COMMAND, read16(address, PCI::RegisterOffset::COMMAND) & ~(1 << 1));
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}
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bool is_io_space_enabled(Address address)
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{
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return (read16(address, PCI::RegisterOffset::COMMAND) & 1) != 0;
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}
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void enable_interrupt_line(Address address)
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{
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write16(address, PCI::RegisterOffset::COMMAND, read16(address, PCI::RegisterOffset::COMMAND) & ~(1 << 10));
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}
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void disable_interrupt_line(Address address)
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{
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write16(address, PCI::RegisterOffset::COMMAND, read16(address, PCI::RegisterOffset::COMMAND) | 1 << 10);
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}
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u32 get_BAR0(Address address)
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{
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return read32(address, PCI::RegisterOffset::BAR0);
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}
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u32 get_BAR1(Address address)
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{
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return read32(address, PCI::RegisterOffset::BAR1);
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}
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u32 get_BAR2(Address address)
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{
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return read32(address, PCI::RegisterOffset::BAR2);
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}
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u32 get_BAR3(Address address)
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{
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return read16(address, PCI::RegisterOffset::BAR3);
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}
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u32 get_BAR4(Address address)
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{
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return read32(address, PCI::RegisterOffset::BAR4);
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}
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u32 get_BAR5(Address address)
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{
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return read32(address, PCI::RegisterOffset::BAR5);
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}
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u32 get_BAR(Address address, u8 bar)
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{
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VERIFY(bar <= 5);
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switch (bar) {
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case 0:
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return get_BAR0(address);
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case 1:
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return get_BAR1(address);
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case 2:
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return get_BAR2(address);
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case 3:
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return get_BAR3(address);
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case 4:
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return get_BAR4(address);
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case 5:
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return get_BAR5(address);
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default:
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VERIFY_NOT_REACHED();
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}
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}
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void enable_bus_mastering(Address address)
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{
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auto value = read16(address, PCI::RegisterOffset::COMMAND);
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value |= (1 << 2);
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value |= (1 << 0);
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write16(address, PCI::RegisterOffset::COMMAND, value);
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}
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void disable_bus_mastering(Address address)
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{
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auto value = read16(address, PCI::RegisterOffset::COMMAND);
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value &= ~(1 << 2);
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value |= (1 << 0);
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write16(address, PCI::RegisterOffset::COMMAND, value);
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}
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static void write8_offsetted(Address address, u32 field, u8 value) { Access::the().write8_field(address, field, value); }
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static void write16_offsetted(Address address, u32 field, u16 value) { Access::the().write16_field(address, field, value); }
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static void write32_offsetted(Address address, u32 field, u32 value) { Access::the().write32_field(address, field, value); }
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static u8 read8_offsetted(Address address, u32 field) { return Access::the().read8_field(address, field); }
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static u16 read16_offsetted(Address address, u32 field) { return Access::the().read16_field(address, field); }
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static u32 read32_offsetted(Address address, u32 field) { return Access::the().read32_field(address, field); }
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size_t get_BAR_space_size(Address address, u8 bar_number)
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{
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// See PCI Spec 2.3, Page 222
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VERIFY(bar_number < 6);
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u8 field = to_underlying(PCI::RegisterOffset::BAR0) + (bar_number << 2);
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u32 bar_reserved = read32_offsetted(address, field);
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write32_offsetted(address, field, 0xFFFFFFFF);
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u32 space_size = read32_offsetted(address, field);
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write32_offsetted(address, field, bar_reserved);
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space_size &= 0xfffffff0;
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space_size = (~space_size) + 1;
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return space_size;
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}
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void raw_access(Address address, u32 field, size_t access_size, u32 value)
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{
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VERIFY(access_size != 0);
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if (access_size == 1) {
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write8_offsetted(address, field, value);
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return;
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}
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if (access_size == 2) {
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write16_offsetted(address, field, value);
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return;
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}
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if (access_size == 4) {
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write32_offsetted(address, field, value);
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return;
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}
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VERIFY_NOT_REACHED();
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}
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u8 Capability::read8(u32 field) const
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{
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return read8_offsetted(m_address, m_ptr + field);
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}
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u16 Capability::read16(u32 field) const
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{
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return read16_offsetted(m_address, m_ptr + field);
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}
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u32 Capability::read32(u32 field) const
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{
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return read32_offsetted(m_address, m_ptr + field);
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}
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void Capability::write8(u32 field, u8 value)
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{
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write8_offsetted(m_address, m_ptr + field, value);
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}
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void Capability::write16(u32 field, u16 value)
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{
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write16_offsetted(m_address, m_ptr + field, value);
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}
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void Capability::write32(u32 field, u32 value)
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{
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write32_offsetted(m_address, m_ptr + field, value);
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}
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}
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