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Kernel/PCI: Add a bunch of debug output to accessors

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This was useful for debugging this issue.
This commit is contained in:
Luke 2020-12-22 04:22:32 +00:00 • committed by Andreas Kling
parent 9ab9e548f4
commit 69d7a34bc2
3 changed files with 90 additions and 9 deletions
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44
Kernel/PCI/Access.cpp
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@ -28,6 +28,8 @@
#include <Kernel/PCI/Access.h>
#include <Kernel/PCI/IOAccess.h>
//#define PCI_DEBUG
namespace Kernel {
namespace PCI {
@ -73,29 +75,44 @@ PhysicalID Access::get_physical_id(Address address) const
u8 Access::early_read8_field(Address address, u32 field)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Early reading 8-bit field 0x" << String::formatted("{:08x}", field) << " for " << address;
#endif
IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
return IO::in8(PCI_VALUE_PORT + (field & 3));
}
u16 Access::early_read16_field(Address address, u32 field)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Early reading 16-bit field 0x" << String::formatted("{:08x}", field) << " for " << address;
#endif
IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
return IO::in16(PCI_VALUE_PORT + (field & 2));
}
u32 Access::early_read32_field(Address address, u32 field)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Early reading 32-bit field 0x" << String::formatted("{:08x}", field) << " for " << address;
#endif
IO::out32(PCI_ADDRESS_PORT, address.io_address_for_field(field));
return IO::in32(PCI_VALUE_PORT);
}
u16 Access::early_read_type(Address address)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Early reading type for " << address;
#endif
return (early_read8_field(address, PCI_CLASS) << 8u) | early_read8_field(address, PCI_SUBCLASS);
}
void Access::enumerate_functions(int type, u8 bus, u8 slot, u8 function, Function<void(Address, ID)>& callback)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Enumerating function type=" << type << ", bus=" << bus << ", slot=" << slot << ", function=" << function;
#endif
Address address(0, bus, slot, function);
if (type == -1 || type == early_read_type(address))
callback(address, { early_read16_field(address, PCI_VENDOR_ID), early_read16_field(address, PCI_DEVICE_ID) });
@ -111,6 +128,9 @@ void Access::enumerate_functions(int type, u8 bus, u8 slot, u8 function, Functio
void Access::enumerate_slot(int type, u8 bus, u8 slot, Function<void(Address, ID)>& callback)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Enumerating slot type=" << type << ", bus=" << bus << ", slot=" << slot;
#endif
Address address(0, bus, slot, 0);
if (early_read16_field(address, PCI_VENDOR_ID) == PCI_NONE)
return;
@ -126,6 +146,9 @@ void Access::enumerate_slot(int type, u8 bus, u8 slot, Function<void(Address, ID
void Access::enumerate_bus(int type, u8 bus, Function<void(Address, ID)>& callback)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Enumerating bus type=" << type << ", bus=" << bus;
#endif
for (u8 slot = 0; slot < 32; ++slot)
enumerate_slot(type, bus, slot, callback);
}
@ -144,9 +167,18 @@ void enumerate(Function<void(Address, ID)> callback)
Optional<u8> get_capabilities_pointer(Address address)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Getting capabilities pointer for " << address;
#endif
if (PCI::read16(address, PCI_STATUS) & (1 << 4)) {
#ifdef PCI_DEBUG
dbg() << "PCI: Found capabilities pointer for " << address;
#endif
return PCI::read8(address, PCI_CAPABILITIES_POINTER);
}
#ifdef PCI_DEBUG
dbg() << "PCI: No capabilities pointer for " << address;
#endif
return {};
}
@ -157,12 +189,22 @@ PhysicalID get_physical_id(Address address)
Vector<Capability> get_capabilities(Address address)
{
#ifdef PCI_DEBUG
dbg() << "PCI: Getting capabilities for " << address;
#endif
auto capabilities_pointer = PCI::get_capabilities_pointer(address);
if (!capabilities_pointer.has_value())
if (!capabilities_pointer.has_value()) {
#ifdef PCI_DEBUG
dbg() << "PCI: No capabilities for " << address;
#endif
return {};
}
Vector<Capability> capabilities;
auto capability_pointer = capabilities_pointer.value();
while (capability_pointer != 0) {
#ifdef PCI_DEBUG
dbg() << "PCI: Reading in capability at 0x" << String::formatted("{:02x}", capability_pointer) << " for " << address;
#endif
u16 capability_header = PCI::read16(address, capability_pointer);
u8 capability_id = capability_header & 0xff;
capability_pointer = capability_header >> 8;